bef16ab4e6
Currently, a jump to a label that is not defined anywhere will
be emitted not be relocated. This results in a jump to a random
jump target. With tcg debugging, print a diagnostic to the -d op
file and abort.
This could help debug or detect errors like
c2d9644e6d ("target/arm: Fix crash on conditional instruction in an IT block")
Reported-by: Roman Kapl <code@rkapl.cz>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
4357 lines
133 KiB
C
4357 lines
133 KiB
C
/*
|
|
* Tiny Code Generator for QEMU
|
|
*
|
|
* Copyright (c) 2008 Fabrice Bellard
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
/* define it to use liveness analysis (better code) */
|
|
#define USE_TCG_OPTIMIZATIONS
|
|
|
|
#include "qemu/osdep.h"
|
|
|
|
/* Define to jump the ELF file used to communicate with GDB. */
|
|
#undef DEBUG_JIT
|
|
|
|
#include "qemu/error-report.h"
|
|
#include "qemu/cutils.h"
|
|
#include "qemu/host-utils.h"
|
|
#include "qemu/timer.h"
|
|
|
|
/* Note: the long term plan is to reduce the dependencies on the QEMU
|
|
CPU definitions. Currently they are used for qemu_ld/st
|
|
instructions */
|
|
#define NO_CPU_IO_DEFS
|
|
#include "cpu.h"
|
|
|
|
#include "exec/cpu-common.h"
|
|
#include "exec/exec-all.h"
|
|
|
|
#include "tcg-op.h"
|
|
|
|
#if UINTPTR_MAX == UINT32_MAX
|
|
# define ELF_CLASS ELFCLASS32
|
|
#else
|
|
# define ELF_CLASS ELFCLASS64
|
|
#endif
|
|
#ifdef HOST_WORDS_BIGENDIAN
|
|
# define ELF_DATA ELFDATA2MSB
|
|
#else
|
|
# define ELF_DATA ELFDATA2LSB
|
|
#endif
|
|
|
|
#include "elf.h"
|
|
#include "exec/log.h"
|
|
#include "sysemu/sysemu.h"
|
|
|
|
/* Forward declarations for functions declared in tcg-target.inc.c and
|
|
used here. */
|
|
static void tcg_target_init(TCGContext *s);
|
|
static const TCGTargetOpDef *tcg_target_op_def(TCGOpcode);
|
|
static void tcg_target_qemu_prologue(TCGContext *s);
|
|
static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
|
|
intptr_t value, intptr_t addend);
|
|
|
|
/* The CIE and FDE header definitions will be common to all hosts. */
|
|
typedef struct {
|
|
uint32_t len __attribute__((aligned((sizeof(void *)))));
|
|
uint32_t id;
|
|
uint8_t version;
|
|
char augmentation[1];
|
|
uint8_t code_align;
|
|
uint8_t data_align;
|
|
uint8_t return_column;
|
|
} DebugFrameCIE;
|
|
|
|
typedef struct QEMU_PACKED {
|
|
uint32_t len __attribute__((aligned((sizeof(void *)))));
|
|
uint32_t cie_offset;
|
|
uintptr_t func_start;
|
|
uintptr_t func_len;
|
|
} DebugFrameFDEHeader;
|
|
|
|
typedef struct QEMU_PACKED {
|
|
DebugFrameCIE cie;
|
|
DebugFrameFDEHeader fde;
|
|
} DebugFrameHeader;
|
|
|
|
static void tcg_register_jit_int(void *buf, size_t size,
|
|
const void *debug_frame,
|
|
size_t debug_frame_size)
|
|
__attribute__((unused));
|
|
|
|
/* Forward declarations for functions declared and used in tcg-target.inc.c. */
|
|
static const char *target_parse_constraint(TCGArgConstraint *ct,
|
|
const char *ct_str, TCGType type);
|
|
static void tcg_out_ld(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg1,
|
|
intptr_t arg2);
|
|
static void tcg_out_mov(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg);
|
|
static void tcg_out_movi(TCGContext *s, TCGType type,
|
|
TCGReg ret, tcg_target_long arg);
|
|
static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
|
|
const int *const_args);
|
|
#if TCG_TARGET_MAYBE_vec
|
|
static void tcg_out_vec_op(TCGContext *s, TCGOpcode opc, unsigned vecl,
|
|
unsigned vece, const TCGArg *args,
|
|
const int *const_args);
|
|
#else
|
|
static inline void tcg_out_vec_op(TCGContext *s, TCGOpcode opc, unsigned vecl,
|
|
unsigned vece, const TCGArg *args,
|
|
const int *const_args)
|
|
{
|
|
g_assert_not_reached();
|
|
}
|
|
#endif
|
|
static void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg, TCGReg arg1,
|
|
intptr_t arg2);
|
|
static bool tcg_out_sti(TCGContext *s, TCGType type, TCGArg val,
|
|
TCGReg base, intptr_t ofs);
|
|
static void tcg_out_call(TCGContext *s, tcg_insn_unit *target);
|
|
static int tcg_target_const_match(tcg_target_long val, TCGType type,
|
|
const TCGArgConstraint *arg_ct);
|
|
#ifdef TCG_TARGET_NEED_LDST_LABELS
|
|
static bool tcg_out_ldst_finalize(TCGContext *s);
|
|
#endif
|
|
|
|
#define TCG_HIGHWATER 1024
|
|
|
|
static TCGContext **tcg_ctxs;
|
|
static unsigned int n_tcg_ctxs;
|
|
TCGv_env cpu_env = 0;
|
|
|
|
struct tcg_region_tree {
|
|
QemuMutex lock;
|
|
GTree *tree;
|
|
/* padding to avoid false sharing is computed at run-time */
|
|
};
|
|
|
|
/*
|
|
* We divide code_gen_buffer into equally-sized "regions" that TCG threads
|
|
* dynamically allocate from as demand dictates. Given appropriate region
|
|
* sizing, this minimizes flushes even when some TCG threads generate a lot
|
|
* more code than others.
|
|
*/
|
|
struct tcg_region_state {
|
|
QemuMutex lock;
|
|
|
|
/* fields set at init time */
|
|
void *start;
|
|
void *start_aligned;
|
|
void *end;
|
|
size_t n;
|
|
size_t size; /* size of one region */
|
|
size_t stride; /* .size + guard size */
|
|
|
|
/* fields protected by the lock */
|
|
size_t current; /* current region index */
|
|
size_t agg_size_full; /* aggregate size of full regions */
|
|
};
|
|
|
|
static struct tcg_region_state region;
|
|
/*
|
|
* This is an array of struct tcg_region_tree's, with padding.
|
|
* We use void * to simplify the computation of region_trees[i]; each
|
|
* struct is found every tree_size bytes.
|
|
*/
|
|
static void *region_trees;
|
|
static size_t tree_size;
|
|
static TCGRegSet tcg_target_available_regs[TCG_TYPE_COUNT];
|
|
static TCGRegSet tcg_target_call_clobber_regs;
|
|
|
|
#if TCG_TARGET_INSN_UNIT_SIZE == 1
|
|
static __attribute__((unused)) inline void tcg_out8(TCGContext *s, uint8_t v)
|
|
{
|
|
*s->code_ptr++ = v;
|
|
}
|
|
|
|
static __attribute__((unused)) inline void tcg_patch8(tcg_insn_unit *p,
|
|
uint8_t v)
|
|
{
|
|
*p = v;
|
|
}
|
|
#endif
|
|
|
|
#if TCG_TARGET_INSN_UNIT_SIZE <= 2
|
|
static __attribute__((unused)) inline void tcg_out16(TCGContext *s, uint16_t v)
|
|
{
|
|
if (TCG_TARGET_INSN_UNIT_SIZE == 2) {
|
|
*s->code_ptr++ = v;
|
|
} else {
|
|
tcg_insn_unit *p = s->code_ptr;
|
|
memcpy(p, &v, sizeof(v));
|
|
s->code_ptr = p + (2 / TCG_TARGET_INSN_UNIT_SIZE);
|
|
}
|
|
}
|
|
|
|
static __attribute__((unused)) inline void tcg_patch16(tcg_insn_unit *p,
|
|
uint16_t v)
|
|
{
|
|
if (TCG_TARGET_INSN_UNIT_SIZE == 2) {
|
|
*p = v;
|
|
} else {
|
|
memcpy(p, &v, sizeof(v));
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if TCG_TARGET_INSN_UNIT_SIZE <= 4
|
|
static __attribute__((unused)) inline void tcg_out32(TCGContext *s, uint32_t v)
|
|
{
|
|
if (TCG_TARGET_INSN_UNIT_SIZE == 4) {
|
|
*s->code_ptr++ = v;
|
|
} else {
|
|
tcg_insn_unit *p = s->code_ptr;
|
|
memcpy(p, &v, sizeof(v));
|
|
s->code_ptr = p + (4 / TCG_TARGET_INSN_UNIT_SIZE);
|
|
}
|
|
}
|
|
|
|
static __attribute__((unused)) inline void tcg_patch32(tcg_insn_unit *p,
|
|
uint32_t v)
|
|
{
|
|
if (TCG_TARGET_INSN_UNIT_SIZE == 4) {
|
|
*p = v;
|
|
} else {
|
|
memcpy(p, &v, sizeof(v));
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if TCG_TARGET_INSN_UNIT_SIZE <= 8
|
|
static __attribute__((unused)) inline void tcg_out64(TCGContext *s, uint64_t v)
|
|
{
|
|
if (TCG_TARGET_INSN_UNIT_SIZE == 8) {
|
|
*s->code_ptr++ = v;
|
|
} else {
|
|
tcg_insn_unit *p = s->code_ptr;
|
|
memcpy(p, &v, sizeof(v));
|
|
s->code_ptr = p + (8 / TCG_TARGET_INSN_UNIT_SIZE);
|
|
}
|
|
}
|
|
|
|
static __attribute__((unused)) inline void tcg_patch64(tcg_insn_unit *p,
|
|
uint64_t v)
|
|
{
|
|
if (TCG_TARGET_INSN_UNIT_SIZE == 8) {
|
|
*p = v;
|
|
} else {
|
|
memcpy(p, &v, sizeof(v));
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* label relocation processing */
|
|
|
|
static void tcg_out_reloc(TCGContext *s, tcg_insn_unit *code_ptr, int type,
|
|
TCGLabel *l, intptr_t addend)
|
|
{
|
|
TCGRelocation *r;
|
|
|
|
if (l->has_value) {
|
|
/* FIXME: This may break relocations on RISC targets that
|
|
modify instruction fields in place. The caller may not have
|
|
written the initial value. */
|
|
bool ok = patch_reloc(code_ptr, type, l->u.value, addend);
|
|
tcg_debug_assert(ok);
|
|
} else {
|
|
/* add a new relocation entry */
|
|
r = tcg_malloc(sizeof(TCGRelocation));
|
|
r->type = type;
|
|
r->ptr = code_ptr;
|
|
r->addend = addend;
|
|
r->next = l->u.first_reloc;
|
|
l->u.first_reloc = r;
|
|
}
|
|
}
|
|
|
|
static void tcg_out_label(TCGContext *s, TCGLabel *l, tcg_insn_unit *ptr)
|
|
{
|
|
intptr_t value = (intptr_t)ptr;
|
|
TCGRelocation *r;
|
|
|
|
tcg_debug_assert(!l->has_value);
|
|
|
|
for (r = l->u.first_reloc; r != NULL; r = r->next) {
|
|
bool ok = patch_reloc(r->ptr, r->type, value, r->addend);
|
|
tcg_debug_assert(ok);
|
|
}
|
|
|
|
l->has_value = 1;
|
|
l->u.value_ptr = ptr;
|
|
}
|
|
|
|
TCGLabel *gen_new_label(void)
|
|
{
|
|
TCGContext *s = tcg_ctx;
|
|
TCGLabel *l = tcg_malloc(sizeof(TCGLabel));
|
|
|
|
*l = (TCGLabel){
|
|
.id = s->nb_labels++
|
|
};
|
|
#ifdef CONFIG_DEBUG_TCG
|
|
QSIMPLEQ_INSERT_TAIL(&s->labels, l, next);
|
|
#endif
|
|
|
|
return l;
|
|
}
|
|
|
|
static void set_jmp_reset_offset(TCGContext *s, int which)
|
|
{
|
|
size_t off = tcg_current_code_size(s);
|
|
s->tb_jmp_reset_offset[which] = off;
|
|
/* Make sure that we didn't overflow the stored offset. */
|
|
assert(s->tb_jmp_reset_offset[which] == off);
|
|
}
|
|
|
|
#include "tcg-target.inc.c"
|
|
|
|
/* compare a pointer @ptr and a tb_tc @s */
|
|
static int ptr_cmp_tb_tc(const void *ptr, const struct tb_tc *s)
|
|
{
|
|
if (ptr >= s->ptr + s->size) {
|
|
return 1;
|
|
} else if (ptr < s->ptr) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static gint tb_tc_cmp(gconstpointer ap, gconstpointer bp)
|
|
{
|
|
const struct tb_tc *a = ap;
|
|
const struct tb_tc *b = bp;
|
|
|
|
/*
|
|
* When both sizes are set, we know this isn't a lookup.
|
|
* This is the most likely case: every TB must be inserted; lookups
|
|
* are a lot less frequent.
|
|
*/
|
|
if (likely(a->size && b->size)) {
|
|
if (a->ptr > b->ptr) {
|
|
return 1;
|
|
} else if (a->ptr < b->ptr) {
|
|
return -1;
|
|
}
|
|
/* a->ptr == b->ptr should happen only on deletions */
|
|
g_assert(a->size == b->size);
|
|
return 0;
|
|
}
|
|
/*
|
|
* All lookups have either .size field set to 0.
|
|
* From the glib sources we see that @ap is always the lookup key. However
|
|
* the docs provide no guarantee, so we just mark this case as likely.
|
|
*/
|
|
if (likely(a->size == 0)) {
|
|
return ptr_cmp_tb_tc(a->ptr, b);
|
|
}
|
|
return ptr_cmp_tb_tc(b->ptr, a);
|
|
}
|
|
|
|
static void tcg_region_trees_init(void)
|
|
{
|
|
size_t i;
|
|
|
|
tree_size = ROUND_UP(sizeof(struct tcg_region_tree), qemu_dcache_linesize);
|
|
region_trees = qemu_memalign(qemu_dcache_linesize, region.n * tree_size);
|
|
for (i = 0; i < region.n; i++) {
|
|
struct tcg_region_tree *rt = region_trees + i * tree_size;
|
|
|
|
qemu_mutex_init(&rt->lock);
|
|
rt->tree = g_tree_new(tb_tc_cmp);
|
|
}
|
|
}
|
|
|
|
static struct tcg_region_tree *tc_ptr_to_region_tree(void *p)
|
|
{
|
|
size_t region_idx;
|
|
|
|
if (p < region.start_aligned) {
|
|
region_idx = 0;
|
|
} else {
|
|
ptrdiff_t offset = p - region.start_aligned;
|
|
|
|
if (offset > region.stride * (region.n - 1)) {
|
|
region_idx = region.n - 1;
|
|
} else {
|
|
region_idx = offset / region.stride;
|
|
}
|
|
}
|
|
return region_trees + region_idx * tree_size;
|
|
}
|
|
|
|
void tcg_tb_insert(TranslationBlock *tb)
|
|
{
|
|
struct tcg_region_tree *rt = tc_ptr_to_region_tree(tb->tc.ptr);
|
|
|
|
qemu_mutex_lock(&rt->lock);
|
|
g_tree_insert(rt->tree, &tb->tc, tb);
|
|
qemu_mutex_unlock(&rt->lock);
|
|
}
|
|
|
|
void tcg_tb_remove(TranslationBlock *tb)
|
|
{
|
|
struct tcg_region_tree *rt = tc_ptr_to_region_tree(tb->tc.ptr);
|
|
|
|
qemu_mutex_lock(&rt->lock);
|
|
g_tree_remove(rt->tree, &tb->tc);
|
|
qemu_mutex_unlock(&rt->lock);
|
|
}
|
|
|
|
/*
|
|
* Find the TB 'tb' such that
|
|
* tb->tc.ptr <= tc_ptr < tb->tc.ptr + tb->tc.size
|
|
* Return NULL if not found.
|
|
*/
|
|
TranslationBlock *tcg_tb_lookup(uintptr_t tc_ptr)
|
|
{
|
|
struct tcg_region_tree *rt = tc_ptr_to_region_tree((void *)tc_ptr);
|
|
TranslationBlock *tb;
|
|
struct tb_tc s = { .ptr = (void *)tc_ptr };
|
|
|
|
qemu_mutex_lock(&rt->lock);
|
|
tb = g_tree_lookup(rt->tree, &s);
|
|
qemu_mutex_unlock(&rt->lock);
|
|
return tb;
|
|
}
|
|
|
|
static void tcg_region_tree_lock_all(void)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = 0; i < region.n; i++) {
|
|
struct tcg_region_tree *rt = region_trees + i * tree_size;
|
|
|
|
qemu_mutex_lock(&rt->lock);
|
|
}
|
|
}
|
|
|
|
static void tcg_region_tree_unlock_all(void)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = 0; i < region.n; i++) {
|
|
struct tcg_region_tree *rt = region_trees + i * tree_size;
|
|
|
|
qemu_mutex_unlock(&rt->lock);
|
|
}
|
|
}
|
|
|
|
void tcg_tb_foreach(GTraverseFunc func, gpointer user_data)
|
|
{
|
|
size_t i;
|
|
|
|
tcg_region_tree_lock_all();
|
|
for (i = 0; i < region.n; i++) {
|
|
struct tcg_region_tree *rt = region_trees + i * tree_size;
|
|
|
|
g_tree_foreach(rt->tree, func, user_data);
|
|
}
|
|
tcg_region_tree_unlock_all();
|
|
}
|
|
|
|
size_t tcg_nb_tbs(void)
|
|
{
|
|
size_t nb_tbs = 0;
|
|
size_t i;
|
|
|
|
tcg_region_tree_lock_all();
|
|
for (i = 0; i < region.n; i++) {
|
|
struct tcg_region_tree *rt = region_trees + i * tree_size;
|
|
|
|
nb_tbs += g_tree_nnodes(rt->tree);
|
|
}
|
|
tcg_region_tree_unlock_all();
|
|
return nb_tbs;
|
|
}
|
|
|
|
static void tcg_region_tree_reset_all(void)
|
|
{
|
|
size_t i;
|
|
|
|
tcg_region_tree_lock_all();
|
|
for (i = 0; i < region.n; i++) {
|
|
struct tcg_region_tree *rt = region_trees + i * tree_size;
|
|
|
|
/* Increment the refcount first so that destroy acts as a reset */
|
|
g_tree_ref(rt->tree);
|
|
g_tree_destroy(rt->tree);
|
|
}
|
|
tcg_region_tree_unlock_all();
|
|
}
|
|
|
|
static void tcg_region_bounds(size_t curr_region, void **pstart, void **pend)
|
|
{
|
|
void *start, *end;
|
|
|
|
start = region.start_aligned + curr_region * region.stride;
|
|
end = start + region.size;
|
|
|
|
if (curr_region == 0) {
|
|
start = region.start;
|
|
}
|
|
if (curr_region == region.n - 1) {
|
|
end = region.end;
|
|
}
|
|
|
|
*pstart = start;
|
|
*pend = end;
|
|
}
|
|
|
|
static void tcg_region_assign(TCGContext *s, size_t curr_region)
|
|
{
|
|
void *start, *end;
|
|
|
|
tcg_region_bounds(curr_region, &start, &end);
|
|
|
|
s->code_gen_buffer = start;
|
|
s->code_gen_ptr = start;
|
|
s->code_gen_buffer_size = end - start;
|
|
s->code_gen_highwater = end - TCG_HIGHWATER;
|
|
}
|
|
|
|
static bool tcg_region_alloc__locked(TCGContext *s)
|
|
{
|
|
if (region.current == region.n) {
|
|
return true;
|
|
}
|
|
tcg_region_assign(s, region.current);
|
|
region.current++;
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Request a new region once the one in use has filled up.
|
|
* Returns true on error.
|
|
*/
|
|
static bool tcg_region_alloc(TCGContext *s)
|
|
{
|
|
bool err;
|
|
/* read the region size now; alloc__locked will overwrite it on success */
|
|
size_t size_full = s->code_gen_buffer_size;
|
|
|
|
qemu_mutex_lock(®ion.lock);
|
|
err = tcg_region_alloc__locked(s);
|
|
if (!err) {
|
|
region.agg_size_full += size_full - TCG_HIGHWATER;
|
|
}
|
|
qemu_mutex_unlock(®ion.lock);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Perform a context's first region allocation.
|
|
* This function does _not_ increment region.agg_size_full.
|
|
*/
|
|
static inline bool tcg_region_initial_alloc__locked(TCGContext *s)
|
|
{
|
|
return tcg_region_alloc__locked(s);
|
|
}
|
|
|
|
/* Call from a safe-work context */
|
|
void tcg_region_reset_all(void)
|
|
{
|
|
unsigned int n_ctxs = atomic_read(&n_tcg_ctxs);
|
|
unsigned int i;
|
|
|
|
qemu_mutex_lock(®ion.lock);
|
|
region.current = 0;
|
|
region.agg_size_full = 0;
|
|
|
|
for (i = 0; i < n_ctxs; i++) {
|
|
TCGContext *s = atomic_read(&tcg_ctxs[i]);
|
|
bool err = tcg_region_initial_alloc__locked(s);
|
|
|
|
g_assert(!err);
|
|
}
|
|
qemu_mutex_unlock(®ion.lock);
|
|
|
|
tcg_region_tree_reset_all();
|
|
}
|
|
|
|
#ifdef CONFIG_USER_ONLY
|
|
static size_t tcg_n_regions(void)
|
|
{
|
|
return 1;
|
|
}
|
|
#else
|
|
/*
|
|
* It is likely that some vCPUs will translate more code than others, so we
|
|
* first try to set more regions than max_cpus, with those regions being of
|
|
* reasonable size. If that's not possible we make do by evenly dividing
|
|
* the code_gen_buffer among the vCPUs.
|
|
*/
|
|
static size_t tcg_n_regions(void)
|
|
{
|
|
size_t i;
|
|
|
|
/* Use a single region if all we have is one vCPU thread */
|
|
if (max_cpus == 1 || !qemu_tcg_mttcg_enabled()) {
|
|
return 1;
|
|
}
|
|
|
|
/* Try to have more regions than max_cpus, with each region being >= 2 MB */
|
|
for (i = 8; i > 0; i--) {
|
|
size_t regions_per_thread = i;
|
|
size_t region_size;
|
|
|
|
region_size = tcg_init_ctx.code_gen_buffer_size;
|
|
region_size /= max_cpus * regions_per_thread;
|
|
|
|
if (region_size >= 2 * 1024u * 1024) {
|
|
return max_cpus * regions_per_thread;
|
|
}
|
|
}
|
|
/* If we can't, then just allocate one region per vCPU thread */
|
|
return max_cpus;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Initializes region partitioning.
|
|
*
|
|
* Called at init time from the parent thread (i.e. the one calling
|
|
* tcg_context_init), after the target's TCG globals have been set.
|
|
*
|
|
* Region partitioning works by splitting code_gen_buffer into separate regions,
|
|
* and then assigning regions to TCG threads so that the threads can translate
|
|
* code in parallel without synchronization.
|
|
*
|
|
* In softmmu the number of TCG threads is bounded by max_cpus, so we use at
|
|
* least max_cpus regions in MTTCG. In !MTTCG we use a single region.
|
|
* Note that the TCG options from the command-line (i.e. -accel accel=tcg,[...])
|
|
* must have been parsed before calling this function, since it calls
|
|
* qemu_tcg_mttcg_enabled().
|
|
*
|
|
* In user-mode we use a single region. Having multiple regions in user-mode
|
|
* is not supported, because the number of vCPU threads (recall that each thread
|
|
* spawned by the guest corresponds to a vCPU thread) is only bounded by the
|
|
* OS, and usually this number is huge (tens of thousands is not uncommon).
|
|
* Thus, given this large bound on the number of vCPU threads and the fact
|
|
* that code_gen_buffer is allocated at compile-time, we cannot guarantee
|
|
* that the availability of at least one region per vCPU thread.
|
|
*
|
|
* However, this user-mode limitation is unlikely to be a significant problem
|
|
* in practice. Multi-threaded guests share most if not all of their translated
|
|
* code, which makes parallel code generation less appealing than in softmmu.
|
|
*/
|
|
void tcg_region_init(void)
|
|
{
|
|
void *buf = tcg_init_ctx.code_gen_buffer;
|
|
void *aligned;
|
|
size_t size = tcg_init_ctx.code_gen_buffer_size;
|
|
size_t page_size = qemu_real_host_page_size;
|
|
size_t region_size;
|
|
size_t n_regions;
|
|
size_t i;
|
|
|
|
n_regions = tcg_n_regions();
|
|
|
|
/* The first region will be 'aligned - buf' bytes larger than the others */
|
|
aligned = QEMU_ALIGN_PTR_UP(buf, page_size);
|
|
g_assert(aligned < tcg_init_ctx.code_gen_buffer + size);
|
|
/*
|
|
* Make region_size a multiple of page_size, using aligned as the start.
|
|
* As a result of this we might end up with a few extra pages at the end of
|
|
* the buffer; we will assign those to the last region.
|
|
*/
|
|
region_size = (size - (aligned - buf)) / n_regions;
|
|
region_size = QEMU_ALIGN_DOWN(region_size, page_size);
|
|
|
|
/* A region must have at least 2 pages; one code, one guard */
|
|
g_assert(region_size >= 2 * page_size);
|
|
|
|
/* init the region struct */
|
|
qemu_mutex_init(®ion.lock);
|
|
region.n = n_regions;
|
|
region.size = region_size - page_size;
|
|
region.stride = region_size;
|
|
region.start = buf;
|
|
region.start_aligned = aligned;
|
|
/* page-align the end, since its last page will be a guard page */
|
|
region.end = QEMU_ALIGN_PTR_DOWN(buf + size, page_size);
|
|
/* account for that last guard page */
|
|
region.end -= page_size;
|
|
|
|
/* set guard pages */
|
|
for (i = 0; i < region.n; i++) {
|
|
void *start, *end;
|
|
int rc;
|
|
|
|
tcg_region_bounds(i, &start, &end);
|
|
rc = qemu_mprotect_none(end, page_size);
|
|
g_assert(!rc);
|
|
}
|
|
|
|
tcg_region_trees_init();
|
|
|
|
/* In user-mode we support only one ctx, so do the initial allocation now */
|
|
#ifdef CONFIG_USER_ONLY
|
|
{
|
|
bool err = tcg_region_initial_alloc__locked(tcg_ctx);
|
|
|
|
g_assert(!err);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* All TCG threads except the parent (i.e. the one that called tcg_context_init
|
|
* and registered the target's TCG globals) must register with this function
|
|
* before initiating translation.
|
|
*
|
|
* In user-mode we just point tcg_ctx to tcg_init_ctx. See the documentation
|
|
* of tcg_region_init() for the reasoning behind this.
|
|
*
|
|
* In softmmu each caller registers its context in tcg_ctxs[]. Note that in
|
|
* softmmu tcg_ctxs[] does not track tcg_ctx_init, since the initial context
|
|
* is not used anymore for translation once this function is called.
|
|
*
|
|
* Not tracking tcg_init_ctx in tcg_ctxs[] in softmmu keeps code that iterates
|
|
* over the array (e.g. tcg_code_size() the same for both softmmu and user-mode.
|
|
*/
|
|
#ifdef CONFIG_USER_ONLY
|
|
void tcg_register_thread(void)
|
|
{
|
|
tcg_ctx = &tcg_init_ctx;
|
|
}
|
|
#else
|
|
void tcg_register_thread(void)
|
|
{
|
|
TCGContext *s = g_malloc(sizeof(*s));
|
|
unsigned int i, n;
|
|
bool err;
|
|
|
|
*s = tcg_init_ctx;
|
|
|
|
/* Relink mem_base. */
|
|
for (i = 0, n = tcg_init_ctx.nb_globals; i < n; ++i) {
|
|
if (tcg_init_ctx.temps[i].mem_base) {
|
|
ptrdiff_t b = tcg_init_ctx.temps[i].mem_base - tcg_init_ctx.temps;
|
|
tcg_debug_assert(b >= 0 && b < n);
|
|
s->temps[i].mem_base = &s->temps[b];
|
|
}
|
|
}
|
|
|
|
/* Claim an entry in tcg_ctxs */
|
|
n = atomic_fetch_inc(&n_tcg_ctxs);
|
|
g_assert(n < max_cpus);
|
|
atomic_set(&tcg_ctxs[n], s);
|
|
|
|
tcg_ctx = s;
|
|
qemu_mutex_lock(®ion.lock);
|
|
err = tcg_region_initial_alloc__locked(tcg_ctx);
|
|
g_assert(!err);
|
|
qemu_mutex_unlock(®ion.lock);
|
|
}
|
|
#endif /* !CONFIG_USER_ONLY */
|
|
|
|
/*
|
|
* Returns the size (in bytes) of all translated code (i.e. from all regions)
|
|
* currently in the cache.
|
|
* See also: tcg_code_capacity()
|
|
* Do not confuse with tcg_current_code_size(); that one applies to a single
|
|
* TCG context.
|
|
*/
|
|
size_t tcg_code_size(void)
|
|
{
|
|
unsigned int n_ctxs = atomic_read(&n_tcg_ctxs);
|
|
unsigned int i;
|
|
size_t total;
|
|
|
|
qemu_mutex_lock(®ion.lock);
|
|
total = region.agg_size_full;
|
|
for (i = 0; i < n_ctxs; i++) {
|
|
const TCGContext *s = atomic_read(&tcg_ctxs[i]);
|
|
size_t size;
|
|
|
|
size = atomic_read(&s->code_gen_ptr) - s->code_gen_buffer;
|
|
g_assert(size <= s->code_gen_buffer_size);
|
|
total += size;
|
|
}
|
|
qemu_mutex_unlock(®ion.lock);
|
|
return total;
|
|
}
|
|
|
|
/*
|
|
* Returns the code capacity (in bytes) of the entire cache, i.e. including all
|
|
* regions.
|
|
* See also: tcg_code_size()
|
|
*/
|
|
size_t tcg_code_capacity(void)
|
|
{
|
|
size_t guard_size, capacity;
|
|
|
|
/* no need for synchronization; these variables are set at init time */
|
|
guard_size = region.stride - region.size;
|
|
capacity = region.end + guard_size - region.start;
|
|
capacity -= region.n * (guard_size + TCG_HIGHWATER);
|
|
return capacity;
|
|
}
|
|
|
|
size_t tcg_tb_phys_invalidate_count(void)
|
|
{
|
|
unsigned int n_ctxs = atomic_read(&n_tcg_ctxs);
|
|
unsigned int i;
|
|
size_t total = 0;
|
|
|
|
for (i = 0; i < n_ctxs; i++) {
|
|
const TCGContext *s = atomic_read(&tcg_ctxs[i]);
|
|
|
|
total += atomic_read(&s->tb_phys_invalidate_count);
|
|
}
|
|
return total;
|
|
}
|
|
|
|
/* pool based memory allocation */
|
|
void *tcg_malloc_internal(TCGContext *s, int size)
|
|
{
|
|
TCGPool *p;
|
|
int pool_size;
|
|
|
|
if (size > TCG_POOL_CHUNK_SIZE) {
|
|
/* big malloc: insert a new pool (XXX: could optimize) */
|
|
p = g_malloc(sizeof(TCGPool) + size);
|
|
p->size = size;
|
|
p->next = s->pool_first_large;
|
|
s->pool_first_large = p;
|
|
return p->data;
|
|
} else {
|
|
p = s->pool_current;
|
|
if (!p) {
|
|
p = s->pool_first;
|
|
if (!p)
|
|
goto new_pool;
|
|
} else {
|
|
if (!p->next) {
|
|
new_pool:
|
|
pool_size = TCG_POOL_CHUNK_SIZE;
|
|
p = g_malloc(sizeof(TCGPool) + pool_size);
|
|
p->size = pool_size;
|
|
p->next = NULL;
|
|
if (s->pool_current)
|
|
s->pool_current->next = p;
|
|
else
|
|
s->pool_first = p;
|
|
} else {
|
|
p = p->next;
|
|
}
|
|
}
|
|
}
|
|
s->pool_current = p;
|
|
s->pool_cur = p->data + size;
|
|
s->pool_end = p->data + p->size;
|
|
return p->data;
|
|
}
|
|
|
|
void tcg_pool_reset(TCGContext *s)
|
|
{
|
|
TCGPool *p, *t;
|
|
for (p = s->pool_first_large; p; p = t) {
|
|
t = p->next;
|
|
g_free(p);
|
|
}
|
|
s->pool_first_large = NULL;
|
|
s->pool_cur = s->pool_end = NULL;
|
|
s->pool_current = NULL;
|
|
}
|
|
|
|
typedef struct TCGHelperInfo {
|
|
void *func;
|
|
const char *name;
|
|
unsigned flags;
|
|
unsigned sizemask;
|
|
} TCGHelperInfo;
|
|
|
|
#include "exec/helper-proto.h"
|
|
|
|
static const TCGHelperInfo all_helpers[] = {
|
|
#include "exec/helper-tcg.h"
|
|
};
|
|
static GHashTable *helper_table;
|
|
|
|
static int indirect_reg_alloc_order[ARRAY_SIZE(tcg_target_reg_alloc_order)];
|
|
static void process_op_defs(TCGContext *s);
|
|
static TCGTemp *tcg_global_reg_new_internal(TCGContext *s, TCGType type,
|
|
TCGReg reg, const char *name);
|
|
|
|
void tcg_context_init(TCGContext *s)
|
|
{
|
|
int op, total_args, n, i;
|
|
TCGOpDef *def;
|
|
TCGArgConstraint *args_ct;
|
|
int *sorted_args;
|
|
TCGTemp *ts;
|
|
|
|
memset(s, 0, sizeof(*s));
|
|
s->nb_globals = 0;
|
|
|
|
/* Count total number of arguments and allocate the corresponding
|
|
space */
|
|
total_args = 0;
|
|
for(op = 0; op < NB_OPS; op++) {
|
|
def = &tcg_op_defs[op];
|
|
n = def->nb_iargs + def->nb_oargs;
|
|
total_args += n;
|
|
}
|
|
|
|
args_ct = g_malloc(sizeof(TCGArgConstraint) * total_args);
|
|
sorted_args = g_malloc(sizeof(int) * total_args);
|
|
|
|
for(op = 0; op < NB_OPS; op++) {
|
|
def = &tcg_op_defs[op];
|
|
def->args_ct = args_ct;
|
|
def->sorted_args = sorted_args;
|
|
n = def->nb_iargs + def->nb_oargs;
|
|
sorted_args += n;
|
|
args_ct += n;
|
|
}
|
|
|
|
/* Register helpers. */
|
|
/* Use g_direct_hash/equal for direct pointer comparisons on func. */
|
|
helper_table = g_hash_table_new(NULL, NULL);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(all_helpers); ++i) {
|
|
g_hash_table_insert(helper_table, (gpointer)all_helpers[i].func,
|
|
(gpointer)&all_helpers[i]);
|
|
}
|
|
|
|
tcg_target_init(s);
|
|
process_op_defs(s);
|
|
|
|
/* Reverse the order of the saved registers, assuming they're all at
|
|
the start of tcg_target_reg_alloc_order. */
|
|
for (n = 0; n < ARRAY_SIZE(tcg_target_reg_alloc_order); ++n) {
|
|
int r = tcg_target_reg_alloc_order[n];
|
|
if (tcg_regset_test_reg(tcg_target_call_clobber_regs, r)) {
|
|
break;
|
|
}
|
|
}
|
|
for (i = 0; i < n; ++i) {
|
|
indirect_reg_alloc_order[i] = tcg_target_reg_alloc_order[n - 1 - i];
|
|
}
|
|
for (; i < ARRAY_SIZE(tcg_target_reg_alloc_order); ++i) {
|
|
indirect_reg_alloc_order[i] = tcg_target_reg_alloc_order[i];
|
|
}
|
|
|
|
tcg_ctx = s;
|
|
/*
|
|
* In user-mode we simply share the init context among threads, since we
|
|
* use a single region. See the documentation tcg_region_init() for the
|
|
* reasoning behind this.
|
|
* In softmmu we will have at most max_cpus TCG threads.
|
|
*/
|
|
#ifdef CONFIG_USER_ONLY
|
|
tcg_ctxs = &tcg_ctx;
|
|
n_tcg_ctxs = 1;
|
|
#else
|
|
tcg_ctxs = g_new(TCGContext *, max_cpus);
|
|
#endif
|
|
|
|
tcg_debug_assert(!tcg_regset_test_reg(s->reserved_regs, TCG_AREG0));
|
|
ts = tcg_global_reg_new_internal(s, TCG_TYPE_PTR, TCG_AREG0, "env");
|
|
cpu_env = temp_tcgv_ptr(ts);
|
|
}
|
|
|
|
/*
|
|
* Allocate TBs right before their corresponding translated code, making
|
|
* sure that TBs and code are on different cache lines.
|
|
*/
|
|
TranslationBlock *tcg_tb_alloc(TCGContext *s)
|
|
{
|
|
uintptr_t align = qemu_icache_linesize;
|
|
TranslationBlock *tb;
|
|
void *next;
|
|
|
|
retry:
|
|
tb = (void *)ROUND_UP((uintptr_t)s->code_gen_ptr, align);
|
|
next = (void *)ROUND_UP((uintptr_t)(tb + 1), align);
|
|
|
|
if (unlikely(next > s->code_gen_highwater)) {
|
|
if (tcg_region_alloc(s)) {
|
|
return NULL;
|
|
}
|
|
goto retry;
|
|
}
|
|
atomic_set(&s->code_gen_ptr, next);
|
|
s->data_gen_ptr = NULL;
|
|
return tb;
|
|
}
|
|
|
|
void tcg_prologue_init(TCGContext *s)
|
|
{
|
|
size_t prologue_size, total_size;
|
|
void *buf0, *buf1;
|
|
|
|
/* Put the prologue at the beginning of code_gen_buffer. */
|
|
buf0 = s->code_gen_buffer;
|
|
total_size = s->code_gen_buffer_size;
|
|
s->code_ptr = buf0;
|
|
s->code_buf = buf0;
|
|
s->data_gen_ptr = NULL;
|
|
s->code_gen_prologue = buf0;
|
|
|
|
/* Compute a high-water mark, at which we voluntarily flush the buffer
|
|
and start over. The size here is arbitrary, significantly larger
|
|
than we expect the code generation for any one opcode to require. */
|
|
s->code_gen_highwater = s->code_gen_buffer + (total_size - TCG_HIGHWATER);
|
|
|
|
#ifdef TCG_TARGET_NEED_POOL_LABELS
|
|
s->pool_labels = NULL;
|
|
#endif
|
|
|
|
/* Generate the prologue. */
|
|
tcg_target_qemu_prologue(s);
|
|
|
|
#ifdef TCG_TARGET_NEED_POOL_LABELS
|
|
/* Allow the prologue to put e.g. guest_base into a pool entry. */
|
|
{
|
|
bool ok = tcg_out_pool_finalize(s);
|
|
tcg_debug_assert(ok);
|
|
}
|
|
#endif
|
|
|
|
buf1 = s->code_ptr;
|
|
flush_icache_range((uintptr_t)buf0, (uintptr_t)buf1);
|
|
|
|
/* Deduct the prologue from the buffer. */
|
|
prologue_size = tcg_current_code_size(s);
|
|
s->code_gen_ptr = buf1;
|
|
s->code_gen_buffer = buf1;
|
|
s->code_buf = buf1;
|
|
total_size -= prologue_size;
|
|
s->code_gen_buffer_size = total_size;
|
|
|
|
tcg_register_jit(s->code_gen_buffer, total_size);
|
|
|
|
#ifdef DEBUG_DISAS
|
|
if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
|
|
qemu_log_lock();
|
|
qemu_log("PROLOGUE: [size=%zu]\n", prologue_size);
|
|
if (s->data_gen_ptr) {
|
|
size_t code_size = s->data_gen_ptr - buf0;
|
|
size_t data_size = prologue_size - code_size;
|
|
size_t i;
|
|
|
|
log_disas(buf0, code_size);
|
|
|
|
for (i = 0; i < data_size; i += sizeof(tcg_target_ulong)) {
|
|
if (sizeof(tcg_target_ulong) == 8) {
|
|
qemu_log("0x%08" PRIxPTR ": .quad 0x%016" PRIx64 "\n",
|
|
(uintptr_t)s->data_gen_ptr + i,
|
|
*(uint64_t *)(s->data_gen_ptr + i));
|
|
} else {
|
|
qemu_log("0x%08" PRIxPTR ": .long 0x%08x\n",
|
|
(uintptr_t)s->data_gen_ptr + i,
|
|
*(uint32_t *)(s->data_gen_ptr + i));
|
|
}
|
|
}
|
|
} else {
|
|
log_disas(buf0, prologue_size);
|
|
}
|
|
qemu_log("\n");
|
|
qemu_log_flush();
|
|
qemu_log_unlock();
|
|
}
|
|
#endif
|
|
|
|
/* Assert that goto_ptr is implemented completely. */
|
|
if (TCG_TARGET_HAS_goto_ptr) {
|
|
tcg_debug_assert(s->code_gen_epilogue != NULL);
|
|
}
|
|
}
|
|
|
|
void tcg_func_start(TCGContext *s)
|
|
{
|
|
tcg_pool_reset(s);
|
|
s->nb_temps = s->nb_globals;
|
|
|
|
/* No temps have been previously allocated for size or locality. */
|
|
memset(s->free_temps, 0, sizeof(s->free_temps));
|
|
|
|
s->nb_ops = 0;
|
|
s->nb_labels = 0;
|
|
s->current_frame_offset = s->frame_start;
|
|
|
|
#ifdef CONFIG_DEBUG_TCG
|
|
s->goto_tb_issue_mask = 0;
|
|
#endif
|
|
|
|
QTAILQ_INIT(&s->ops);
|
|
QTAILQ_INIT(&s->free_ops);
|
|
#ifdef CONFIG_DEBUG_TCG
|
|
QSIMPLEQ_INIT(&s->labels);
|
|
#endif
|
|
}
|
|
|
|
static inline TCGTemp *tcg_temp_alloc(TCGContext *s)
|
|
{
|
|
int n = s->nb_temps++;
|
|
tcg_debug_assert(n < TCG_MAX_TEMPS);
|
|
return memset(&s->temps[n], 0, sizeof(TCGTemp));
|
|
}
|
|
|
|
static inline TCGTemp *tcg_global_alloc(TCGContext *s)
|
|
{
|
|
TCGTemp *ts;
|
|
|
|
tcg_debug_assert(s->nb_globals == s->nb_temps);
|
|
s->nb_globals++;
|
|
ts = tcg_temp_alloc(s);
|
|
ts->temp_global = 1;
|
|
|
|
return ts;
|
|
}
|
|
|
|
static TCGTemp *tcg_global_reg_new_internal(TCGContext *s, TCGType type,
|
|
TCGReg reg, const char *name)
|
|
{
|
|
TCGTemp *ts;
|
|
|
|
if (TCG_TARGET_REG_BITS == 32 && type != TCG_TYPE_I32) {
|
|
tcg_abort();
|
|
}
|
|
|
|
ts = tcg_global_alloc(s);
|
|
ts->base_type = type;
|
|
ts->type = type;
|
|
ts->fixed_reg = 1;
|
|
ts->reg = reg;
|
|
ts->name = name;
|
|
tcg_regset_set_reg(s->reserved_regs, reg);
|
|
|
|
return ts;
|
|
}
|
|
|
|
void tcg_set_frame(TCGContext *s, TCGReg reg, intptr_t start, intptr_t size)
|
|
{
|
|
s->frame_start = start;
|
|
s->frame_end = start + size;
|
|
s->frame_temp
|
|
= tcg_global_reg_new_internal(s, TCG_TYPE_PTR, reg, "_frame");
|
|
}
|
|
|
|
TCGTemp *tcg_global_mem_new_internal(TCGType type, TCGv_ptr base,
|
|
intptr_t offset, const char *name)
|
|
{
|
|
TCGContext *s = tcg_ctx;
|
|
TCGTemp *base_ts = tcgv_ptr_temp(base);
|
|
TCGTemp *ts = tcg_global_alloc(s);
|
|
int indirect_reg = 0, bigendian = 0;
|
|
#ifdef HOST_WORDS_BIGENDIAN
|
|
bigendian = 1;
|
|
#endif
|
|
|
|
if (!base_ts->fixed_reg) {
|
|
/* We do not support double-indirect registers. */
|
|
tcg_debug_assert(!base_ts->indirect_reg);
|
|
base_ts->indirect_base = 1;
|
|
s->nb_indirects += (TCG_TARGET_REG_BITS == 32 && type == TCG_TYPE_I64
|
|
? 2 : 1);
|
|
indirect_reg = 1;
|
|
}
|
|
|
|
if (TCG_TARGET_REG_BITS == 32 && type == TCG_TYPE_I64) {
|
|
TCGTemp *ts2 = tcg_global_alloc(s);
|
|
char buf[64];
|
|
|
|
ts->base_type = TCG_TYPE_I64;
|
|
ts->type = TCG_TYPE_I32;
|
|
ts->indirect_reg = indirect_reg;
|
|
ts->mem_allocated = 1;
|
|
ts->mem_base = base_ts;
|
|
ts->mem_offset = offset + bigendian * 4;
|
|
pstrcpy(buf, sizeof(buf), name);
|
|
pstrcat(buf, sizeof(buf), "_0");
|
|
ts->name = strdup(buf);
|
|
|
|
tcg_debug_assert(ts2 == ts + 1);
|
|
ts2->base_type = TCG_TYPE_I64;
|
|
ts2->type = TCG_TYPE_I32;
|
|
ts2->indirect_reg = indirect_reg;
|
|
ts2->mem_allocated = 1;
|
|
ts2->mem_base = base_ts;
|
|
ts2->mem_offset = offset + (1 - bigendian) * 4;
|
|
pstrcpy(buf, sizeof(buf), name);
|
|
pstrcat(buf, sizeof(buf), "_1");
|
|
ts2->name = strdup(buf);
|
|
} else {
|
|
ts->base_type = type;
|
|
ts->type = type;
|
|
ts->indirect_reg = indirect_reg;
|
|
ts->mem_allocated = 1;
|
|
ts->mem_base = base_ts;
|
|
ts->mem_offset = offset;
|
|
ts->name = name;
|
|
}
|
|
return ts;
|
|
}
|
|
|
|
TCGTemp *tcg_temp_new_internal(TCGType type, bool temp_local)
|
|
{
|
|
TCGContext *s = tcg_ctx;
|
|
TCGTemp *ts;
|
|
int idx, k;
|
|
|
|
k = type + (temp_local ? TCG_TYPE_COUNT : 0);
|
|
idx = find_first_bit(s->free_temps[k].l, TCG_MAX_TEMPS);
|
|
if (idx < TCG_MAX_TEMPS) {
|
|
/* There is already an available temp with the right type. */
|
|
clear_bit(idx, s->free_temps[k].l);
|
|
|
|
ts = &s->temps[idx];
|
|
ts->temp_allocated = 1;
|
|
tcg_debug_assert(ts->base_type == type);
|
|
tcg_debug_assert(ts->temp_local == temp_local);
|
|
} else {
|
|
ts = tcg_temp_alloc(s);
|
|
if (TCG_TARGET_REG_BITS == 32 && type == TCG_TYPE_I64) {
|
|
TCGTemp *ts2 = tcg_temp_alloc(s);
|
|
|
|
ts->base_type = type;
|
|
ts->type = TCG_TYPE_I32;
|
|
ts->temp_allocated = 1;
|
|
ts->temp_local = temp_local;
|
|
|
|
tcg_debug_assert(ts2 == ts + 1);
|
|
ts2->base_type = TCG_TYPE_I64;
|
|
ts2->type = TCG_TYPE_I32;
|
|
ts2->temp_allocated = 1;
|
|
ts2->temp_local = temp_local;
|
|
} else {
|
|
ts->base_type = type;
|
|
ts->type = type;
|
|
ts->temp_allocated = 1;
|
|
ts->temp_local = temp_local;
|
|
}
|
|
}
|
|
|
|
#if defined(CONFIG_DEBUG_TCG)
|
|
s->temps_in_use++;
|
|
#endif
|
|
return ts;
|
|
}
|
|
|
|
TCGv_vec tcg_temp_new_vec(TCGType type)
|
|
{
|
|
TCGTemp *t;
|
|
|
|
#ifdef CONFIG_DEBUG_TCG
|
|
switch (type) {
|
|
case TCG_TYPE_V64:
|
|
assert(TCG_TARGET_HAS_v64);
|
|
break;
|
|
case TCG_TYPE_V128:
|
|
assert(TCG_TARGET_HAS_v128);
|
|
break;
|
|
case TCG_TYPE_V256:
|
|
assert(TCG_TARGET_HAS_v256);
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
#endif
|
|
|
|
t = tcg_temp_new_internal(type, 0);
|
|
return temp_tcgv_vec(t);
|
|
}
|
|
|
|
/* Create a new temp of the same type as an existing temp. */
|
|
TCGv_vec tcg_temp_new_vec_matching(TCGv_vec match)
|
|
{
|
|
TCGTemp *t = tcgv_vec_temp(match);
|
|
|
|
tcg_debug_assert(t->temp_allocated != 0);
|
|
|
|
t = tcg_temp_new_internal(t->base_type, 0);
|
|
return temp_tcgv_vec(t);
|
|
}
|
|
|
|
void tcg_temp_free_internal(TCGTemp *ts)
|
|
{
|
|
TCGContext *s = tcg_ctx;
|
|
int k, idx;
|
|
|
|
#if defined(CONFIG_DEBUG_TCG)
|
|
s->temps_in_use--;
|
|
if (s->temps_in_use < 0) {
|
|
fprintf(stderr, "More temporaries freed than allocated!\n");
|
|
}
|
|
#endif
|
|
|
|
tcg_debug_assert(ts->temp_global == 0);
|
|
tcg_debug_assert(ts->temp_allocated != 0);
|
|
ts->temp_allocated = 0;
|
|
|
|
idx = temp_idx(ts);
|
|
k = ts->base_type + (ts->temp_local ? TCG_TYPE_COUNT : 0);
|
|
set_bit(idx, s->free_temps[k].l);
|
|
}
|
|
|
|
TCGv_i32 tcg_const_i32(int32_t val)
|
|
{
|
|
TCGv_i32 t0;
|
|
t0 = tcg_temp_new_i32();
|
|
tcg_gen_movi_i32(t0, val);
|
|
return t0;
|
|
}
|
|
|
|
TCGv_i64 tcg_const_i64(int64_t val)
|
|
{
|
|
TCGv_i64 t0;
|
|
t0 = tcg_temp_new_i64();
|
|
tcg_gen_movi_i64(t0, val);
|
|
return t0;
|
|
}
|
|
|
|
TCGv_i32 tcg_const_local_i32(int32_t val)
|
|
{
|
|
TCGv_i32 t0;
|
|
t0 = tcg_temp_local_new_i32();
|
|
tcg_gen_movi_i32(t0, val);
|
|
return t0;
|
|
}
|
|
|
|
TCGv_i64 tcg_const_local_i64(int64_t val)
|
|
{
|
|
TCGv_i64 t0;
|
|
t0 = tcg_temp_local_new_i64();
|
|
tcg_gen_movi_i64(t0, val);
|
|
return t0;
|
|
}
|
|
|
|
#if defined(CONFIG_DEBUG_TCG)
|
|
void tcg_clear_temp_count(void)
|
|
{
|
|
TCGContext *s = tcg_ctx;
|
|
s->temps_in_use = 0;
|
|
}
|
|
|
|
int tcg_check_temp_count(void)
|
|
{
|
|
TCGContext *s = tcg_ctx;
|
|
if (s->temps_in_use) {
|
|
/* Clear the count so that we don't give another
|
|
* warning immediately next time around.
|
|
*/
|
|
s->temps_in_use = 0;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* Return true if OP may appear in the opcode stream.
|
|
Test the runtime variable that controls each opcode. */
|
|
bool tcg_op_supported(TCGOpcode op)
|
|
{
|
|
const bool have_vec
|
|
= TCG_TARGET_HAS_v64 | TCG_TARGET_HAS_v128 | TCG_TARGET_HAS_v256;
|
|
|
|
switch (op) {
|
|
case INDEX_op_discard:
|
|
case INDEX_op_set_label:
|
|
case INDEX_op_call:
|
|
case INDEX_op_br:
|
|
case INDEX_op_mb:
|
|
case INDEX_op_insn_start:
|
|
case INDEX_op_exit_tb:
|
|
case INDEX_op_goto_tb:
|
|
case INDEX_op_qemu_ld_i32:
|
|
case INDEX_op_qemu_st_i32:
|
|
case INDEX_op_qemu_ld_i64:
|
|
case INDEX_op_qemu_st_i64:
|
|
return true;
|
|
|
|
case INDEX_op_goto_ptr:
|
|
return TCG_TARGET_HAS_goto_ptr;
|
|
|
|
case INDEX_op_mov_i32:
|
|
case INDEX_op_movi_i32:
|
|
case INDEX_op_setcond_i32:
|
|
case INDEX_op_brcond_i32:
|
|
case INDEX_op_ld8u_i32:
|
|
case INDEX_op_ld8s_i32:
|
|
case INDEX_op_ld16u_i32:
|
|
case INDEX_op_ld16s_i32:
|
|
case INDEX_op_ld_i32:
|
|
case INDEX_op_st8_i32:
|
|
case INDEX_op_st16_i32:
|
|
case INDEX_op_st_i32:
|
|
case INDEX_op_add_i32:
|
|
case INDEX_op_sub_i32:
|
|
case INDEX_op_mul_i32:
|
|
case INDEX_op_and_i32:
|
|
case INDEX_op_or_i32:
|
|
case INDEX_op_xor_i32:
|
|
case INDEX_op_shl_i32:
|
|
case INDEX_op_shr_i32:
|
|
case INDEX_op_sar_i32:
|
|
return true;
|
|
|
|
case INDEX_op_movcond_i32:
|
|
return TCG_TARGET_HAS_movcond_i32;
|
|
case INDEX_op_div_i32:
|
|
case INDEX_op_divu_i32:
|
|
return TCG_TARGET_HAS_div_i32;
|
|
case INDEX_op_rem_i32:
|
|
case INDEX_op_remu_i32:
|
|
return TCG_TARGET_HAS_rem_i32;
|
|
case INDEX_op_div2_i32:
|
|
case INDEX_op_divu2_i32:
|
|
return TCG_TARGET_HAS_div2_i32;
|
|
case INDEX_op_rotl_i32:
|
|
case INDEX_op_rotr_i32:
|
|
return TCG_TARGET_HAS_rot_i32;
|
|
case INDEX_op_deposit_i32:
|
|
return TCG_TARGET_HAS_deposit_i32;
|
|
case INDEX_op_extract_i32:
|
|
return TCG_TARGET_HAS_extract_i32;
|
|
case INDEX_op_sextract_i32:
|
|
return TCG_TARGET_HAS_sextract_i32;
|
|
case INDEX_op_add2_i32:
|
|
return TCG_TARGET_HAS_add2_i32;
|
|
case INDEX_op_sub2_i32:
|
|
return TCG_TARGET_HAS_sub2_i32;
|
|
case INDEX_op_mulu2_i32:
|
|
return TCG_TARGET_HAS_mulu2_i32;
|
|
case INDEX_op_muls2_i32:
|
|
return TCG_TARGET_HAS_muls2_i32;
|
|
case INDEX_op_muluh_i32:
|
|
return TCG_TARGET_HAS_muluh_i32;
|
|
case INDEX_op_mulsh_i32:
|
|
return TCG_TARGET_HAS_mulsh_i32;
|
|
case INDEX_op_ext8s_i32:
|
|
return TCG_TARGET_HAS_ext8s_i32;
|
|
case INDEX_op_ext16s_i32:
|
|
return TCG_TARGET_HAS_ext16s_i32;
|
|
case INDEX_op_ext8u_i32:
|
|
return TCG_TARGET_HAS_ext8u_i32;
|
|
case INDEX_op_ext16u_i32:
|
|
return TCG_TARGET_HAS_ext16u_i32;
|
|
case INDEX_op_bswap16_i32:
|
|
return TCG_TARGET_HAS_bswap16_i32;
|
|
case INDEX_op_bswap32_i32:
|
|
return TCG_TARGET_HAS_bswap32_i32;
|
|
case INDEX_op_not_i32:
|
|
return TCG_TARGET_HAS_not_i32;
|
|
case INDEX_op_neg_i32:
|
|
return TCG_TARGET_HAS_neg_i32;
|
|
case INDEX_op_andc_i32:
|
|
return TCG_TARGET_HAS_andc_i32;
|
|
case INDEX_op_orc_i32:
|
|
return TCG_TARGET_HAS_orc_i32;
|
|
case INDEX_op_eqv_i32:
|
|
return TCG_TARGET_HAS_eqv_i32;
|
|
case INDEX_op_nand_i32:
|
|
return TCG_TARGET_HAS_nand_i32;
|
|
case INDEX_op_nor_i32:
|
|
return TCG_TARGET_HAS_nor_i32;
|
|
case INDEX_op_clz_i32:
|
|
return TCG_TARGET_HAS_clz_i32;
|
|
case INDEX_op_ctz_i32:
|
|
return TCG_TARGET_HAS_ctz_i32;
|
|
case INDEX_op_ctpop_i32:
|
|
return TCG_TARGET_HAS_ctpop_i32;
|
|
|
|
case INDEX_op_brcond2_i32:
|
|
case INDEX_op_setcond2_i32:
|
|
return TCG_TARGET_REG_BITS == 32;
|
|
|
|
case INDEX_op_mov_i64:
|
|
case INDEX_op_movi_i64:
|
|
case INDEX_op_setcond_i64:
|
|
case INDEX_op_brcond_i64:
|
|
case INDEX_op_ld8u_i64:
|
|
case INDEX_op_ld8s_i64:
|
|
case INDEX_op_ld16u_i64:
|
|
case INDEX_op_ld16s_i64:
|
|
case INDEX_op_ld32u_i64:
|
|
case INDEX_op_ld32s_i64:
|
|
case INDEX_op_ld_i64:
|
|
case INDEX_op_st8_i64:
|
|
case INDEX_op_st16_i64:
|
|
case INDEX_op_st32_i64:
|
|
case INDEX_op_st_i64:
|
|
case INDEX_op_add_i64:
|
|
case INDEX_op_sub_i64:
|
|
case INDEX_op_mul_i64:
|
|
case INDEX_op_and_i64:
|
|
case INDEX_op_or_i64:
|
|
case INDEX_op_xor_i64:
|
|
case INDEX_op_shl_i64:
|
|
case INDEX_op_shr_i64:
|
|
case INDEX_op_sar_i64:
|
|
case INDEX_op_ext_i32_i64:
|
|
case INDEX_op_extu_i32_i64:
|
|
return TCG_TARGET_REG_BITS == 64;
|
|
|
|
case INDEX_op_movcond_i64:
|
|
return TCG_TARGET_HAS_movcond_i64;
|
|
case INDEX_op_div_i64:
|
|
case INDEX_op_divu_i64:
|
|
return TCG_TARGET_HAS_div_i64;
|
|
case INDEX_op_rem_i64:
|
|
case INDEX_op_remu_i64:
|
|
return TCG_TARGET_HAS_rem_i64;
|
|
case INDEX_op_div2_i64:
|
|
case INDEX_op_divu2_i64:
|
|
return TCG_TARGET_HAS_div2_i64;
|
|
case INDEX_op_rotl_i64:
|
|
case INDEX_op_rotr_i64:
|
|
return TCG_TARGET_HAS_rot_i64;
|
|
case INDEX_op_deposit_i64:
|
|
return TCG_TARGET_HAS_deposit_i64;
|
|
case INDEX_op_extract_i64:
|
|
return TCG_TARGET_HAS_extract_i64;
|
|
case INDEX_op_sextract_i64:
|
|
return TCG_TARGET_HAS_sextract_i64;
|
|
case INDEX_op_extrl_i64_i32:
|
|
return TCG_TARGET_HAS_extrl_i64_i32;
|
|
case INDEX_op_extrh_i64_i32:
|
|
return TCG_TARGET_HAS_extrh_i64_i32;
|
|
case INDEX_op_ext8s_i64:
|
|
return TCG_TARGET_HAS_ext8s_i64;
|
|
case INDEX_op_ext16s_i64:
|
|
return TCG_TARGET_HAS_ext16s_i64;
|
|
case INDEX_op_ext32s_i64:
|
|
return TCG_TARGET_HAS_ext32s_i64;
|
|
case INDEX_op_ext8u_i64:
|
|
return TCG_TARGET_HAS_ext8u_i64;
|
|
case INDEX_op_ext16u_i64:
|
|
return TCG_TARGET_HAS_ext16u_i64;
|
|
case INDEX_op_ext32u_i64:
|
|
return TCG_TARGET_HAS_ext32u_i64;
|
|
case INDEX_op_bswap16_i64:
|
|
return TCG_TARGET_HAS_bswap16_i64;
|
|
case INDEX_op_bswap32_i64:
|
|
return TCG_TARGET_HAS_bswap32_i64;
|
|
case INDEX_op_bswap64_i64:
|
|
return TCG_TARGET_HAS_bswap64_i64;
|
|
case INDEX_op_not_i64:
|
|
return TCG_TARGET_HAS_not_i64;
|
|
case INDEX_op_neg_i64:
|
|
return TCG_TARGET_HAS_neg_i64;
|
|
case INDEX_op_andc_i64:
|
|
return TCG_TARGET_HAS_andc_i64;
|
|
case INDEX_op_orc_i64:
|
|
return TCG_TARGET_HAS_orc_i64;
|
|
case INDEX_op_eqv_i64:
|
|
return TCG_TARGET_HAS_eqv_i64;
|
|
case INDEX_op_nand_i64:
|
|
return TCG_TARGET_HAS_nand_i64;
|
|
case INDEX_op_nor_i64:
|
|
return TCG_TARGET_HAS_nor_i64;
|
|
case INDEX_op_clz_i64:
|
|
return TCG_TARGET_HAS_clz_i64;
|
|
case INDEX_op_ctz_i64:
|
|
return TCG_TARGET_HAS_ctz_i64;
|
|
case INDEX_op_ctpop_i64:
|
|
return TCG_TARGET_HAS_ctpop_i64;
|
|
case INDEX_op_add2_i64:
|
|
return TCG_TARGET_HAS_add2_i64;
|
|
case INDEX_op_sub2_i64:
|
|
return TCG_TARGET_HAS_sub2_i64;
|
|
case INDEX_op_mulu2_i64:
|
|
return TCG_TARGET_HAS_mulu2_i64;
|
|
case INDEX_op_muls2_i64:
|
|
return TCG_TARGET_HAS_muls2_i64;
|
|
case INDEX_op_muluh_i64:
|
|
return TCG_TARGET_HAS_muluh_i64;
|
|
case INDEX_op_mulsh_i64:
|
|
return TCG_TARGET_HAS_mulsh_i64;
|
|
|
|
case INDEX_op_mov_vec:
|
|
case INDEX_op_dup_vec:
|
|
case INDEX_op_dupi_vec:
|
|
case INDEX_op_ld_vec:
|
|
case INDEX_op_st_vec:
|
|
case INDEX_op_add_vec:
|
|
case INDEX_op_sub_vec:
|
|
case INDEX_op_and_vec:
|
|
case INDEX_op_or_vec:
|
|
case INDEX_op_xor_vec:
|
|
case INDEX_op_cmp_vec:
|
|
return have_vec;
|
|
case INDEX_op_dup2_vec:
|
|
return have_vec && TCG_TARGET_REG_BITS == 32;
|
|
case INDEX_op_not_vec:
|
|
return have_vec && TCG_TARGET_HAS_not_vec;
|
|
case INDEX_op_neg_vec:
|
|
return have_vec && TCG_TARGET_HAS_neg_vec;
|
|
case INDEX_op_andc_vec:
|
|
return have_vec && TCG_TARGET_HAS_andc_vec;
|
|
case INDEX_op_orc_vec:
|
|
return have_vec && TCG_TARGET_HAS_orc_vec;
|
|
case INDEX_op_mul_vec:
|
|
return have_vec && TCG_TARGET_HAS_mul_vec;
|
|
case INDEX_op_shli_vec:
|
|
case INDEX_op_shri_vec:
|
|
case INDEX_op_sari_vec:
|
|
return have_vec && TCG_TARGET_HAS_shi_vec;
|
|
case INDEX_op_shls_vec:
|
|
case INDEX_op_shrs_vec:
|
|
case INDEX_op_sars_vec:
|
|
return have_vec && TCG_TARGET_HAS_shs_vec;
|
|
case INDEX_op_shlv_vec:
|
|
case INDEX_op_shrv_vec:
|
|
case INDEX_op_sarv_vec:
|
|
return have_vec && TCG_TARGET_HAS_shv_vec;
|
|
case INDEX_op_ssadd_vec:
|
|
case INDEX_op_usadd_vec:
|
|
case INDEX_op_sssub_vec:
|
|
case INDEX_op_ussub_vec:
|
|
return have_vec && TCG_TARGET_HAS_sat_vec;
|
|
case INDEX_op_smin_vec:
|
|
case INDEX_op_umin_vec:
|
|
case INDEX_op_smax_vec:
|
|
case INDEX_op_umax_vec:
|
|
return have_vec && TCG_TARGET_HAS_minmax_vec;
|
|
|
|
default:
|
|
tcg_debug_assert(op > INDEX_op_last_generic && op < NB_OPS);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/* Note: we convert the 64 bit args to 32 bit and do some alignment
|
|
and endian swap. Maybe it would be better to do the alignment
|
|
and endian swap in tcg_reg_alloc_call(). */
|
|
void tcg_gen_callN(void *func, TCGTemp *ret, int nargs, TCGTemp **args)
|
|
{
|
|
int i, real_args, nb_rets, pi;
|
|
unsigned sizemask, flags;
|
|
TCGHelperInfo *info;
|
|
TCGOp *op;
|
|
|
|
info = g_hash_table_lookup(helper_table, (gpointer)func);
|
|
flags = info->flags;
|
|
sizemask = info->sizemask;
|
|
|
|
#if defined(__sparc__) && !defined(__arch64__) \
|
|
&& !defined(CONFIG_TCG_INTERPRETER)
|
|
/* We have 64-bit values in one register, but need to pass as two
|
|
separate parameters. Split them. */
|
|
int orig_sizemask = sizemask;
|
|
int orig_nargs = nargs;
|
|
TCGv_i64 retl, reth;
|
|
TCGTemp *split_args[MAX_OPC_PARAM];
|
|
|
|
retl = NULL;
|
|
reth = NULL;
|
|
if (sizemask != 0) {
|
|
for (i = real_args = 0; i < nargs; ++i) {
|
|
int is_64bit = sizemask & (1 << (i+1)*2);
|
|
if (is_64bit) {
|
|
TCGv_i64 orig = temp_tcgv_i64(args[i]);
|
|
TCGv_i32 h = tcg_temp_new_i32();
|
|
TCGv_i32 l = tcg_temp_new_i32();
|
|
tcg_gen_extr_i64_i32(l, h, orig);
|
|
split_args[real_args++] = tcgv_i32_temp(h);
|
|
split_args[real_args++] = tcgv_i32_temp(l);
|
|
} else {
|
|
split_args[real_args++] = args[i];
|
|
}
|
|
}
|
|
nargs = real_args;
|
|
args = split_args;
|
|
sizemask = 0;
|
|
}
|
|
#elif defined(TCG_TARGET_EXTEND_ARGS) && TCG_TARGET_REG_BITS == 64
|
|
for (i = 0; i < nargs; ++i) {
|
|
int is_64bit = sizemask & (1 << (i+1)*2);
|
|
int is_signed = sizemask & (2 << (i+1)*2);
|
|
if (!is_64bit) {
|
|
TCGv_i64 temp = tcg_temp_new_i64();
|
|
TCGv_i64 orig = temp_tcgv_i64(args[i]);
|
|
if (is_signed) {
|
|
tcg_gen_ext32s_i64(temp, orig);
|
|
} else {
|
|
tcg_gen_ext32u_i64(temp, orig);
|
|
}
|
|
args[i] = tcgv_i64_temp(temp);
|
|
}
|
|
}
|
|
#endif /* TCG_TARGET_EXTEND_ARGS */
|
|
|
|
op = tcg_emit_op(INDEX_op_call);
|
|
|
|
pi = 0;
|
|
if (ret != NULL) {
|
|
#if defined(__sparc__) && !defined(__arch64__) \
|
|
&& !defined(CONFIG_TCG_INTERPRETER)
|
|
if (orig_sizemask & 1) {
|
|
/* The 32-bit ABI is going to return the 64-bit value in
|
|
the %o0/%o1 register pair. Prepare for this by using
|
|
two return temporaries, and reassemble below. */
|
|
retl = tcg_temp_new_i64();
|
|
reth = tcg_temp_new_i64();
|
|
op->args[pi++] = tcgv_i64_arg(reth);
|
|
op->args[pi++] = tcgv_i64_arg(retl);
|
|
nb_rets = 2;
|
|
} else {
|
|
op->args[pi++] = temp_arg(ret);
|
|
nb_rets = 1;
|
|
}
|
|
#else
|
|
if (TCG_TARGET_REG_BITS < 64 && (sizemask & 1)) {
|
|
#ifdef HOST_WORDS_BIGENDIAN
|
|
op->args[pi++] = temp_arg(ret + 1);
|
|
op->args[pi++] = temp_arg(ret);
|
|
#else
|
|
op->args[pi++] = temp_arg(ret);
|
|
op->args[pi++] = temp_arg(ret + 1);
|
|
#endif
|
|
nb_rets = 2;
|
|
} else {
|
|
op->args[pi++] = temp_arg(ret);
|
|
nb_rets = 1;
|
|
}
|
|
#endif
|
|
} else {
|
|
nb_rets = 0;
|
|
}
|
|
TCGOP_CALLO(op) = nb_rets;
|
|
|
|
real_args = 0;
|
|
for (i = 0; i < nargs; i++) {
|
|
int is_64bit = sizemask & (1 << (i+1)*2);
|
|
if (TCG_TARGET_REG_BITS < 64 && is_64bit) {
|
|
#ifdef TCG_TARGET_CALL_ALIGN_ARGS
|
|
/* some targets want aligned 64 bit args */
|
|
if (real_args & 1) {
|
|
op->args[pi++] = TCG_CALL_DUMMY_ARG;
|
|
real_args++;
|
|
}
|
|
#endif
|
|
/* If stack grows up, then we will be placing successive
|
|
arguments at lower addresses, which means we need to
|
|
reverse the order compared to how we would normally
|
|
treat either big or little-endian. For those arguments
|
|
that will wind up in registers, this still works for
|
|
HPPA (the only current STACK_GROWSUP target) since the
|
|
argument registers are *also* allocated in decreasing
|
|
order. If another such target is added, this logic may
|
|
have to get more complicated to differentiate between
|
|
stack arguments and register arguments. */
|
|
#if defined(HOST_WORDS_BIGENDIAN) != defined(TCG_TARGET_STACK_GROWSUP)
|
|
op->args[pi++] = temp_arg(args[i] + 1);
|
|
op->args[pi++] = temp_arg(args[i]);
|
|
#else
|
|
op->args[pi++] = temp_arg(args[i]);
|
|
op->args[pi++] = temp_arg(args[i] + 1);
|
|
#endif
|
|
real_args += 2;
|
|
continue;
|
|
}
|
|
|
|
op->args[pi++] = temp_arg(args[i]);
|
|
real_args++;
|
|
}
|
|
op->args[pi++] = (uintptr_t)func;
|
|
op->args[pi++] = flags;
|
|
TCGOP_CALLI(op) = real_args;
|
|
|
|
/* Make sure the fields didn't overflow. */
|
|
tcg_debug_assert(TCGOP_CALLI(op) == real_args);
|
|
tcg_debug_assert(pi <= ARRAY_SIZE(op->args));
|
|
|
|
#if defined(__sparc__) && !defined(__arch64__) \
|
|
&& !defined(CONFIG_TCG_INTERPRETER)
|
|
/* Free all of the parts we allocated above. */
|
|
for (i = real_args = 0; i < orig_nargs; ++i) {
|
|
int is_64bit = orig_sizemask & (1 << (i+1)*2);
|
|
if (is_64bit) {
|
|
tcg_temp_free_internal(args[real_args++]);
|
|
tcg_temp_free_internal(args[real_args++]);
|
|
} else {
|
|
real_args++;
|
|
}
|
|
}
|
|
if (orig_sizemask & 1) {
|
|
/* The 32-bit ABI returned two 32-bit pieces. Re-assemble them.
|
|
Note that describing these as TCGv_i64 eliminates an unnecessary
|
|
zero-extension that tcg_gen_concat_i32_i64 would create. */
|
|
tcg_gen_concat32_i64(temp_tcgv_i64(ret), retl, reth);
|
|
tcg_temp_free_i64(retl);
|
|
tcg_temp_free_i64(reth);
|
|
}
|
|
#elif defined(TCG_TARGET_EXTEND_ARGS) && TCG_TARGET_REG_BITS == 64
|
|
for (i = 0; i < nargs; ++i) {
|
|
int is_64bit = sizemask & (1 << (i+1)*2);
|
|
if (!is_64bit) {
|
|
tcg_temp_free_internal(args[i]);
|
|
}
|
|
}
|
|
#endif /* TCG_TARGET_EXTEND_ARGS */
|
|
}
|
|
|
|
static void tcg_reg_alloc_start(TCGContext *s)
|
|
{
|
|
int i, n;
|
|
TCGTemp *ts;
|
|
|
|
for (i = 0, n = s->nb_globals; i < n; i++) {
|
|
ts = &s->temps[i];
|
|
ts->val_type = (ts->fixed_reg ? TEMP_VAL_REG : TEMP_VAL_MEM);
|
|
}
|
|
for (n = s->nb_temps; i < n; i++) {
|
|
ts = &s->temps[i];
|
|
ts->val_type = (ts->temp_local ? TEMP_VAL_MEM : TEMP_VAL_DEAD);
|
|
ts->mem_allocated = 0;
|
|
ts->fixed_reg = 0;
|
|
}
|
|
|
|
memset(s->reg_to_temp, 0, sizeof(s->reg_to_temp));
|
|
}
|
|
|
|
static char *tcg_get_arg_str_ptr(TCGContext *s, char *buf, int buf_size,
|
|
TCGTemp *ts)
|
|
{
|
|
int idx = temp_idx(ts);
|
|
|
|
if (ts->temp_global) {
|
|
pstrcpy(buf, buf_size, ts->name);
|
|
} else if (ts->temp_local) {
|
|
snprintf(buf, buf_size, "loc%d", idx - s->nb_globals);
|
|
} else {
|
|
snprintf(buf, buf_size, "tmp%d", idx - s->nb_globals);
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
static char *tcg_get_arg_str(TCGContext *s, char *buf,
|
|
int buf_size, TCGArg arg)
|
|
{
|
|
return tcg_get_arg_str_ptr(s, buf, buf_size, arg_temp(arg));
|
|
}
|
|
|
|
/* Find helper name. */
|
|
static inline const char *tcg_find_helper(TCGContext *s, uintptr_t val)
|
|
{
|
|
const char *ret = NULL;
|
|
if (helper_table) {
|
|
TCGHelperInfo *info = g_hash_table_lookup(helper_table, (gpointer)val);
|
|
if (info) {
|
|
ret = info->name;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static const char * const cond_name[] =
|
|
{
|
|
[TCG_COND_NEVER] = "never",
|
|
[TCG_COND_ALWAYS] = "always",
|
|
[TCG_COND_EQ] = "eq",
|
|
[TCG_COND_NE] = "ne",
|
|
[TCG_COND_LT] = "lt",
|
|
[TCG_COND_GE] = "ge",
|
|
[TCG_COND_LE] = "le",
|
|
[TCG_COND_GT] = "gt",
|
|
[TCG_COND_LTU] = "ltu",
|
|
[TCG_COND_GEU] = "geu",
|
|
[TCG_COND_LEU] = "leu",
|
|
[TCG_COND_GTU] = "gtu"
|
|
};
|
|
|
|
static const char * const ldst_name[] =
|
|
{
|
|
[MO_UB] = "ub",
|
|
[MO_SB] = "sb",
|
|
[MO_LEUW] = "leuw",
|
|
[MO_LESW] = "lesw",
|
|
[MO_LEUL] = "leul",
|
|
[MO_LESL] = "lesl",
|
|
[MO_LEQ] = "leq",
|
|
[MO_BEUW] = "beuw",
|
|
[MO_BESW] = "besw",
|
|
[MO_BEUL] = "beul",
|
|
[MO_BESL] = "besl",
|
|
[MO_BEQ] = "beq",
|
|
};
|
|
|
|
static const char * const alignment_name[(MO_AMASK >> MO_ASHIFT) + 1] = {
|
|
#ifdef ALIGNED_ONLY
|
|
[MO_UNALN >> MO_ASHIFT] = "un+",
|
|
[MO_ALIGN >> MO_ASHIFT] = "",
|
|
#else
|
|
[MO_UNALN >> MO_ASHIFT] = "",
|
|
[MO_ALIGN >> MO_ASHIFT] = "al+",
|
|
#endif
|
|
[MO_ALIGN_2 >> MO_ASHIFT] = "al2+",
|
|
[MO_ALIGN_4 >> MO_ASHIFT] = "al4+",
|
|
[MO_ALIGN_8 >> MO_ASHIFT] = "al8+",
|
|
[MO_ALIGN_16 >> MO_ASHIFT] = "al16+",
|
|
[MO_ALIGN_32 >> MO_ASHIFT] = "al32+",
|
|
[MO_ALIGN_64 >> MO_ASHIFT] = "al64+",
|
|
};
|
|
|
|
static inline bool tcg_regset_single(TCGRegSet d)
|
|
{
|
|
return (d & (d - 1)) == 0;
|
|
}
|
|
|
|
static inline TCGReg tcg_regset_first(TCGRegSet d)
|
|
{
|
|
if (TCG_TARGET_NB_REGS <= 32) {
|
|
return ctz32(d);
|
|
} else {
|
|
return ctz64(d);
|
|
}
|
|
}
|
|
|
|
static void tcg_dump_ops(TCGContext *s, bool have_prefs)
|
|
{
|
|
char buf[128];
|
|
TCGOp *op;
|
|
|
|
QTAILQ_FOREACH(op, &s->ops, link) {
|
|
int i, k, nb_oargs, nb_iargs, nb_cargs;
|
|
const TCGOpDef *def;
|
|
TCGOpcode c;
|
|
int col = 0;
|
|
|
|
c = op->opc;
|
|
def = &tcg_op_defs[c];
|
|
|
|
if (c == INDEX_op_insn_start) {
|
|
nb_oargs = 0;
|
|
col += qemu_log("\n ----");
|
|
|
|
for (i = 0; i < TARGET_INSN_START_WORDS; ++i) {
|
|
target_ulong a;
|
|
#if TARGET_LONG_BITS > TCG_TARGET_REG_BITS
|
|
a = deposit64(op->args[i * 2], 32, 32, op->args[i * 2 + 1]);
|
|
#else
|
|
a = op->args[i];
|
|
#endif
|
|
col += qemu_log(" " TARGET_FMT_lx, a);
|
|
}
|
|
} else if (c == INDEX_op_call) {
|
|
/* variable number of arguments */
|
|
nb_oargs = TCGOP_CALLO(op);
|
|
nb_iargs = TCGOP_CALLI(op);
|
|
nb_cargs = def->nb_cargs;
|
|
|
|
/* function name, flags, out args */
|
|
col += qemu_log(" %s %s,$0x%" TCG_PRIlx ",$%d", def->name,
|
|
tcg_find_helper(s, op->args[nb_oargs + nb_iargs]),
|
|
op->args[nb_oargs + nb_iargs + 1], nb_oargs);
|
|
for (i = 0; i < nb_oargs; i++) {
|
|
col += qemu_log(",%s", tcg_get_arg_str(s, buf, sizeof(buf),
|
|
op->args[i]));
|
|
}
|
|
for (i = 0; i < nb_iargs; i++) {
|
|
TCGArg arg = op->args[nb_oargs + i];
|
|
const char *t = "<dummy>";
|
|
if (arg != TCG_CALL_DUMMY_ARG) {
|
|
t = tcg_get_arg_str(s, buf, sizeof(buf), arg);
|
|
}
|
|
col += qemu_log(",%s", t);
|
|
}
|
|
} else {
|
|
col += qemu_log(" %s ", def->name);
|
|
|
|
nb_oargs = def->nb_oargs;
|
|
nb_iargs = def->nb_iargs;
|
|
nb_cargs = def->nb_cargs;
|
|
|
|
if (def->flags & TCG_OPF_VECTOR) {
|
|
col += qemu_log("v%d,e%d,", 64 << TCGOP_VECL(op),
|
|
8 << TCGOP_VECE(op));
|
|
}
|
|
|
|
k = 0;
|
|
for (i = 0; i < nb_oargs; i++) {
|
|
if (k != 0) {
|
|
col += qemu_log(",");
|
|
}
|
|
col += qemu_log("%s", tcg_get_arg_str(s, buf, sizeof(buf),
|
|
op->args[k++]));
|
|
}
|
|
for (i = 0; i < nb_iargs; i++) {
|
|
if (k != 0) {
|
|
col += qemu_log(",");
|
|
}
|
|
col += qemu_log("%s", tcg_get_arg_str(s, buf, sizeof(buf),
|
|
op->args[k++]));
|
|
}
|
|
switch (c) {
|
|
case INDEX_op_brcond_i32:
|
|
case INDEX_op_setcond_i32:
|
|
case INDEX_op_movcond_i32:
|
|
case INDEX_op_brcond2_i32:
|
|
case INDEX_op_setcond2_i32:
|
|
case INDEX_op_brcond_i64:
|
|
case INDEX_op_setcond_i64:
|
|
case INDEX_op_movcond_i64:
|
|
case INDEX_op_cmp_vec:
|
|
if (op->args[k] < ARRAY_SIZE(cond_name)
|
|
&& cond_name[op->args[k]]) {
|
|
col += qemu_log(",%s", cond_name[op->args[k++]]);
|
|
} else {
|
|
col += qemu_log(",$0x%" TCG_PRIlx, op->args[k++]);
|
|
}
|
|
i = 1;
|
|
break;
|
|
case INDEX_op_qemu_ld_i32:
|
|
case INDEX_op_qemu_st_i32:
|
|
case INDEX_op_qemu_ld_i64:
|
|
case INDEX_op_qemu_st_i64:
|
|
{
|
|
TCGMemOpIdx oi = op->args[k++];
|
|
TCGMemOp op = get_memop(oi);
|
|
unsigned ix = get_mmuidx(oi);
|
|
|
|
if (op & ~(MO_AMASK | MO_BSWAP | MO_SSIZE)) {
|
|
col += qemu_log(",$0x%x,%u", op, ix);
|
|
} else {
|
|
const char *s_al, *s_op;
|
|
s_al = alignment_name[(op & MO_AMASK) >> MO_ASHIFT];
|
|
s_op = ldst_name[op & (MO_BSWAP | MO_SSIZE)];
|
|
col += qemu_log(",%s%s,%u", s_al, s_op, ix);
|
|
}
|
|
i = 1;
|
|
}
|
|
break;
|
|
default:
|
|
i = 0;
|
|
break;
|
|
}
|
|
switch (c) {
|
|
case INDEX_op_set_label:
|
|
case INDEX_op_br:
|
|
case INDEX_op_brcond_i32:
|
|
case INDEX_op_brcond_i64:
|
|
case INDEX_op_brcond2_i32:
|
|
col += qemu_log("%s$L%d", k ? "," : "",
|
|
arg_label(op->args[k])->id);
|
|
i++, k++;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
for (; i < nb_cargs; i++, k++) {
|
|
col += qemu_log("%s$0x%" TCG_PRIlx, k ? "," : "", op->args[k]);
|
|
}
|
|
}
|
|
|
|
if (have_prefs || op->life) {
|
|
for (; col < 40; ++col) {
|
|
putc(' ', qemu_logfile);
|
|
}
|
|
}
|
|
|
|
if (op->life) {
|
|
unsigned life = op->life;
|
|
|
|
if (life & (SYNC_ARG * 3)) {
|
|
qemu_log(" sync:");
|
|
for (i = 0; i < 2; ++i) {
|
|
if (life & (SYNC_ARG << i)) {
|
|
qemu_log(" %d", i);
|
|
}
|
|
}
|
|
}
|
|
life /= DEAD_ARG;
|
|
if (life) {
|
|
qemu_log(" dead:");
|
|
for (i = 0; life; ++i, life >>= 1) {
|
|
if (life & 1) {
|
|
qemu_log(" %d", i);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (have_prefs) {
|
|
for (i = 0; i < nb_oargs; ++i) {
|
|
TCGRegSet set = op->output_pref[i];
|
|
|
|
if (i == 0) {
|
|
qemu_log(" pref=");
|
|
} else {
|
|
qemu_log(",");
|
|
}
|
|
if (set == 0) {
|
|
qemu_log("none");
|
|
} else if (set == MAKE_64BIT_MASK(0, TCG_TARGET_NB_REGS)) {
|
|
qemu_log("all");
|
|
#ifdef CONFIG_DEBUG_TCG
|
|
} else if (tcg_regset_single(set)) {
|
|
TCGReg reg = tcg_regset_first(set);
|
|
qemu_log("%s", tcg_target_reg_names[reg]);
|
|
#endif
|
|
} else if (TCG_TARGET_NB_REGS <= 32) {
|
|
qemu_log("%#x", (uint32_t)set);
|
|
} else {
|
|
qemu_log("%#" PRIx64, (uint64_t)set);
|
|
}
|
|
}
|
|
}
|
|
|
|
qemu_log("\n");
|
|
}
|
|
}
|
|
|
|
/* we give more priority to constraints with less registers */
|
|
static int get_constraint_priority(const TCGOpDef *def, int k)
|
|
{
|
|
const TCGArgConstraint *arg_ct;
|
|
|
|
int i, n;
|
|
arg_ct = &def->args_ct[k];
|
|
if (arg_ct->ct & TCG_CT_ALIAS) {
|
|
/* an alias is equivalent to a single register */
|
|
n = 1;
|
|
} else {
|
|
if (!(arg_ct->ct & TCG_CT_REG))
|
|
return 0;
|
|
n = 0;
|
|
for(i = 0; i < TCG_TARGET_NB_REGS; i++) {
|
|
if (tcg_regset_test_reg(arg_ct->u.regs, i))
|
|
n++;
|
|
}
|
|
}
|
|
return TCG_TARGET_NB_REGS - n + 1;
|
|
}
|
|
|
|
/* sort from highest priority to lowest */
|
|
static void sort_constraints(TCGOpDef *def, int start, int n)
|
|
{
|
|
int i, j, p1, p2, tmp;
|
|
|
|
for(i = 0; i < n; i++)
|
|
def->sorted_args[start + i] = start + i;
|
|
if (n <= 1)
|
|
return;
|
|
for(i = 0; i < n - 1; i++) {
|
|
for(j = i + 1; j < n; j++) {
|
|
p1 = get_constraint_priority(def, def->sorted_args[start + i]);
|
|
p2 = get_constraint_priority(def, def->sorted_args[start + j]);
|
|
if (p1 < p2) {
|
|
tmp = def->sorted_args[start + i];
|
|
def->sorted_args[start + i] = def->sorted_args[start + j];
|
|
def->sorted_args[start + j] = tmp;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void process_op_defs(TCGContext *s)
|
|
{
|
|
TCGOpcode op;
|
|
|
|
for (op = 0; op < NB_OPS; op++) {
|
|
TCGOpDef *def = &tcg_op_defs[op];
|
|
const TCGTargetOpDef *tdefs;
|
|
TCGType type;
|
|
int i, nb_args;
|
|
|
|
if (def->flags & TCG_OPF_NOT_PRESENT) {
|
|
continue;
|
|
}
|
|
|
|
nb_args = def->nb_iargs + def->nb_oargs;
|
|
if (nb_args == 0) {
|
|
continue;
|
|
}
|
|
|
|
tdefs = tcg_target_op_def(op);
|
|
/* Missing TCGTargetOpDef entry. */
|
|
tcg_debug_assert(tdefs != NULL);
|
|
|
|
type = (def->flags & TCG_OPF_64BIT ? TCG_TYPE_I64 : TCG_TYPE_I32);
|
|
for (i = 0; i < nb_args; i++) {
|
|
const char *ct_str = tdefs->args_ct_str[i];
|
|
/* Incomplete TCGTargetOpDef entry. */
|
|
tcg_debug_assert(ct_str != NULL);
|
|
|
|
def->args_ct[i].u.regs = 0;
|
|
def->args_ct[i].ct = 0;
|
|
while (*ct_str != '\0') {
|
|
switch(*ct_str) {
|
|
case '0' ... '9':
|
|
{
|
|
int oarg = *ct_str - '0';
|
|
tcg_debug_assert(ct_str == tdefs->args_ct_str[i]);
|
|
tcg_debug_assert(oarg < def->nb_oargs);
|
|
tcg_debug_assert(def->args_ct[oarg].ct & TCG_CT_REG);
|
|
/* TCG_CT_ALIAS is for the output arguments.
|
|
The input is tagged with TCG_CT_IALIAS. */
|
|
def->args_ct[i] = def->args_ct[oarg];
|
|
def->args_ct[oarg].ct |= TCG_CT_ALIAS;
|
|
def->args_ct[oarg].alias_index = i;
|
|
def->args_ct[i].ct |= TCG_CT_IALIAS;
|
|
def->args_ct[i].alias_index = oarg;
|
|
}
|
|
ct_str++;
|
|
break;
|
|
case '&':
|
|
def->args_ct[i].ct |= TCG_CT_NEWREG;
|
|
ct_str++;
|
|
break;
|
|
case 'i':
|
|
def->args_ct[i].ct |= TCG_CT_CONST;
|
|
ct_str++;
|
|
break;
|
|
default:
|
|
ct_str = target_parse_constraint(&def->args_ct[i],
|
|
ct_str, type);
|
|
/* Typo in TCGTargetOpDef constraint. */
|
|
tcg_debug_assert(ct_str != NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* TCGTargetOpDef entry with too much information? */
|
|
tcg_debug_assert(i == TCG_MAX_OP_ARGS || tdefs->args_ct_str[i] == NULL);
|
|
|
|
/* sort the constraints (XXX: this is just an heuristic) */
|
|
sort_constraints(def, 0, def->nb_oargs);
|
|
sort_constraints(def, def->nb_oargs, def->nb_iargs);
|
|
}
|
|
}
|
|
|
|
void tcg_op_remove(TCGContext *s, TCGOp *op)
|
|
{
|
|
TCGLabel *label;
|
|
|
|
switch (op->opc) {
|
|
case INDEX_op_br:
|
|
label = arg_label(op->args[0]);
|
|
label->refs--;
|
|
break;
|
|
case INDEX_op_brcond_i32:
|
|
case INDEX_op_brcond_i64:
|
|
label = arg_label(op->args[3]);
|
|
label->refs--;
|
|
break;
|
|
case INDEX_op_brcond2_i32:
|
|
label = arg_label(op->args[5]);
|
|
label->refs--;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
QTAILQ_REMOVE(&s->ops, op, link);
|
|
QTAILQ_INSERT_TAIL(&s->free_ops, op, link);
|
|
s->nb_ops--;
|
|
|
|
#ifdef CONFIG_PROFILER
|
|
atomic_set(&s->prof.del_op_count, s->prof.del_op_count + 1);
|
|
#endif
|
|
}
|
|
|
|
static TCGOp *tcg_op_alloc(TCGOpcode opc)
|
|
{
|
|
TCGContext *s = tcg_ctx;
|
|
TCGOp *op;
|
|
|
|
if (likely(QTAILQ_EMPTY(&s->free_ops))) {
|
|
op = tcg_malloc(sizeof(TCGOp));
|
|
} else {
|
|
op = QTAILQ_FIRST(&s->free_ops);
|
|
QTAILQ_REMOVE(&s->free_ops, op, link);
|
|
}
|
|
memset(op, 0, offsetof(TCGOp, link));
|
|
op->opc = opc;
|
|
s->nb_ops++;
|
|
|
|
return op;
|
|
}
|
|
|
|
TCGOp *tcg_emit_op(TCGOpcode opc)
|
|
{
|
|
TCGOp *op = tcg_op_alloc(opc);
|
|
QTAILQ_INSERT_TAIL(&tcg_ctx->ops, op, link);
|
|
return op;
|
|
}
|
|
|
|
TCGOp *tcg_op_insert_before(TCGContext *s, TCGOp *old_op, TCGOpcode opc)
|
|
{
|
|
TCGOp *new_op = tcg_op_alloc(opc);
|
|
QTAILQ_INSERT_BEFORE(old_op, new_op, link);
|
|
return new_op;
|
|
}
|
|
|
|
TCGOp *tcg_op_insert_after(TCGContext *s, TCGOp *old_op, TCGOpcode opc)
|
|
{
|
|
TCGOp *new_op = tcg_op_alloc(opc);
|
|
QTAILQ_INSERT_AFTER(&s->ops, old_op, new_op, link);
|
|
return new_op;
|
|
}
|
|
|
|
/* Reachable analysis : remove unreachable code. */
|
|
static void reachable_code_pass(TCGContext *s)
|
|
{
|
|
TCGOp *op, *op_next;
|
|
bool dead = false;
|
|
|
|
QTAILQ_FOREACH_SAFE(op, &s->ops, link, op_next) {
|
|
bool remove = dead;
|
|
TCGLabel *label;
|
|
int call_flags;
|
|
|
|
switch (op->opc) {
|
|
case INDEX_op_set_label:
|
|
label = arg_label(op->args[0]);
|
|
if (label->refs == 0) {
|
|
/*
|
|
* While there is an occasional backward branch, virtually
|
|
* all branches generated by the translators are forward.
|
|
* Which means that generally we will have already removed
|
|
* all references to the label that will be, and there is
|
|
* little to be gained by iterating.
|
|
*/
|
|
remove = true;
|
|
} else {
|
|
/* Once we see a label, insns become live again. */
|
|
dead = false;
|
|
remove = false;
|
|
|
|
/*
|
|
* Optimization can fold conditional branches to unconditional.
|
|
* If we find a label with one reference which is preceded by
|
|
* an unconditional branch to it, remove both. This needed to
|
|
* wait until the dead code in between them was removed.
|
|
*/
|
|
if (label->refs == 1) {
|
|
TCGOp *op_prev = QTAILQ_PREV(op, link);
|
|
if (op_prev->opc == INDEX_op_br &&
|
|
label == arg_label(op_prev->args[0])) {
|
|
tcg_op_remove(s, op_prev);
|
|
remove = true;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case INDEX_op_br:
|
|
case INDEX_op_exit_tb:
|
|
case INDEX_op_goto_ptr:
|
|
/* Unconditional branches; everything following is dead. */
|
|
dead = true;
|
|
break;
|
|
|
|
case INDEX_op_call:
|
|
/* Notice noreturn helper calls, raising exceptions. */
|
|
call_flags = op->args[TCGOP_CALLO(op) + TCGOP_CALLI(op) + 1];
|
|
if (call_flags & TCG_CALL_NO_RETURN) {
|
|
dead = true;
|
|
}
|
|
break;
|
|
|
|
case INDEX_op_insn_start:
|
|
/* Never remove -- we need to keep these for unwind. */
|
|
remove = false;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (remove) {
|
|
tcg_op_remove(s, op);
|
|
}
|
|
}
|
|
}
|
|
|
|
#define TS_DEAD 1
|
|
#define TS_MEM 2
|
|
|
|
#define IS_DEAD_ARG(n) (arg_life & (DEAD_ARG << (n)))
|
|
#define NEED_SYNC_ARG(n) (arg_life & (SYNC_ARG << (n)))
|
|
|
|
/* For liveness_pass_1, the register preferences for a given temp. */
|
|
static inline TCGRegSet *la_temp_pref(TCGTemp *ts)
|
|
{
|
|
return ts->state_ptr;
|
|
}
|
|
|
|
/* For liveness_pass_1, reset the preferences for a given temp to the
|
|
* maximal regset for its type.
|
|
*/
|
|
static inline void la_reset_pref(TCGTemp *ts)
|
|
{
|
|
*la_temp_pref(ts)
|
|
= (ts->state == TS_DEAD ? 0 : tcg_target_available_regs[ts->type]);
|
|
}
|
|
|
|
/* liveness analysis: end of function: all temps are dead, and globals
|
|
should be in memory. */
|
|
static void la_func_end(TCGContext *s, int ng, int nt)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ng; ++i) {
|
|
s->temps[i].state = TS_DEAD | TS_MEM;
|
|
la_reset_pref(&s->temps[i]);
|
|
}
|
|
for (i = ng; i < nt; ++i) {
|
|
s->temps[i].state = TS_DEAD;
|
|
la_reset_pref(&s->temps[i]);
|
|
}
|
|
}
|
|
|
|
/* liveness analysis: end of basic block: all temps are dead, globals
|
|
and local temps should be in memory. */
|
|
static void la_bb_end(TCGContext *s, int ng, int nt)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ng; ++i) {
|
|
s->temps[i].state = TS_DEAD | TS_MEM;
|
|
la_reset_pref(&s->temps[i]);
|
|
}
|
|
for (i = ng; i < nt; ++i) {
|
|
s->temps[i].state = (s->temps[i].temp_local
|
|
? TS_DEAD | TS_MEM
|
|
: TS_DEAD);
|
|
la_reset_pref(&s->temps[i]);
|
|
}
|
|
}
|
|
|
|
/* liveness analysis: sync globals back to memory. */
|
|
static void la_global_sync(TCGContext *s, int ng)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ng; ++i) {
|
|
int state = s->temps[i].state;
|
|
s->temps[i].state = state | TS_MEM;
|
|
if (state == TS_DEAD) {
|
|
/* If the global was previously dead, reset prefs. */
|
|
la_reset_pref(&s->temps[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* liveness analysis: sync globals back to memory and kill. */
|
|
static void la_global_kill(TCGContext *s, int ng)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ng; i++) {
|
|
s->temps[i].state = TS_DEAD | TS_MEM;
|
|
la_reset_pref(&s->temps[i]);
|
|
}
|
|
}
|
|
|
|
/* liveness analysis: note live globals crossing calls. */
|
|
static void la_cross_call(TCGContext *s, int nt)
|
|
{
|
|
TCGRegSet mask = ~tcg_target_call_clobber_regs;
|
|
int i;
|
|
|
|
for (i = 0; i < nt; i++) {
|
|
TCGTemp *ts = &s->temps[i];
|
|
if (!(ts->state & TS_DEAD)) {
|
|
TCGRegSet *pset = la_temp_pref(ts);
|
|
TCGRegSet set = *pset;
|
|
|
|
set &= mask;
|
|
/* If the combination is not possible, restart. */
|
|
if (set == 0) {
|
|
set = tcg_target_available_regs[ts->type] & mask;
|
|
}
|
|
*pset = set;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Liveness analysis : update the opc_arg_life array to tell if a
|
|
given input arguments is dead. Instructions updating dead
|
|
temporaries are removed. */
|
|
static void liveness_pass_1(TCGContext *s)
|
|
{
|
|
int nb_globals = s->nb_globals;
|
|
int nb_temps = s->nb_temps;
|
|
TCGOp *op, *op_prev;
|
|
TCGRegSet *prefs;
|
|
int i;
|
|
|
|
prefs = tcg_malloc(sizeof(TCGRegSet) * nb_temps);
|
|
for (i = 0; i < nb_temps; ++i) {
|
|
s->temps[i].state_ptr = prefs + i;
|
|
}
|
|
|
|
/* ??? Should be redundant with the exit_tb that ends the TB. */
|
|
la_func_end(s, nb_globals, nb_temps);
|
|
|
|
QTAILQ_FOREACH_REVERSE_SAFE(op, &s->ops, link, op_prev) {
|
|
int nb_iargs, nb_oargs;
|
|
TCGOpcode opc_new, opc_new2;
|
|
bool have_opc_new2;
|
|
TCGLifeData arg_life = 0;
|
|
TCGTemp *ts;
|
|
TCGOpcode opc = op->opc;
|
|
const TCGOpDef *def = &tcg_op_defs[opc];
|
|
|
|
switch (opc) {
|
|
case INDEX_op_call:
|
|
{
|
|
int call_flags;
|
|
int nb_call_regs;
|
|
|
|
nb_oargs = TCGOP_CALLO(op);
|
|
nb_iargs = TCGOP_CALLI(op);
|
|
call_flags = op->args[nb_oargs + nb_iargs + 1];
|
|
|
|
/* pure functions can be removed if their result is unused */
|
|
if (call_flags & TCG_CALL_NO_SIDE_EFFECTS) {
|
|
for (i = 0; i < nb_oargs; i++) {
|
|
ts = arg_temp(op->args[i]);
|
|
if (ts->state != TS_DEAD) {
|
|
goto do_not_remove_call;
|
|
}
|
|
}
|
|
goto do_remove;
|
|
}
|
|
do_not_remove_call:
|
|
|
|
/* Output args are dead. */
|
|
for (i = 0; i < nb_oargs; i++) {
|
|
ts = arg_temp(op->args[i]);
|
|
if (ts->state & TS_DEAD) {
|
|
arg_life |= DEAD_ARG << i;
|
|
}
|
|
if (ts->state & TS_MEM) {
|
|
arg_life |= SYNC_ARG << i;
|
|
}
|
|
ts->state = TS_DEAD;
|
|
la_reset_pref(ts);
|
|
|
|
/* Not used -- it will be tcg_target_call_oarg_regs[i]. */
|
|
op->output_pref[i] = 0;
|
|
}
|
|
|
|
if (!(call_flags & (TCG_CALL_NO_WRITE_GLOBALS |
|
|
TCG_CALL_NO_READ_GLOBALS))) {
|
|
la_global_kill(s, nb_globals);
|
|
} else if (!(call_flags & TCG_CALL_NO_READ_GLOBALS)) {
|
|
la_global_sync(s, nb_globals);
|
|
}
|
|
|
|
/* Record arguments that die in this helper. */
|
|
for (i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
|
|
ts = arg_temp(op->args[i]);
|
|
if (ts && ts->state & TS_DEAD) {
|
|
arg_life |= DEAD_ARG << i;
|
|
}
|
|
}
|
|
|
|
/* For all live registers, remove call-clobbered prefs. */
|
|
la_cross_call(s, nb_temps);
|
|
|
|
nb_call_regs = ARRAY_SIZE(tcg_target_call_iarg_regs);
|
|
|
|
/* Input arguments are live for preceding opcodes. */
|
|
for (i = 0; i < nb_iargs; i++) {
|
|
ts = arg_temp(op->args[i + nb_oargs]);
|
|
if (ts && ts->state & TS_DEAD) {
|
|
/* For those arguments that die, and will be allocated
|
|
* in registers, clear the register set for that arg,
|
|
* to be filled in below. For args that will be on
|
|
* the stack, reset to any available reg.
|
|
*/
|
|
*la_temp_pref(ts)
|
|
= (i < nb_call_regs ? 0 :
|
|
tcg_target_available_regs[ts->type]);
|
|
ts->state &= ~TS_DEAD;
|
|
}
|
|
}
|
|
|
|
/* For each input argument, add its input register to prefs.
|
|
If a temp is used once, this produces a single set bit. */
|
|
for (i = 0; i < MIN(nb_call_regs, nb_iargs); i++) {
|
|
ts = arg_temp(op->args[i + nb_oargs]);
|
|
if (ts) {
|
|
tcg_regset_set_reg(*la_temp_pref(ts),
|
|
tcg_target_call_iarg_regs[i]);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case INDEX_op_insn_start:
|
|
break;
|
|
case INDEX_op_discard:
|
|
/* mark the temporary as dead */
|
|
ts = arg_temp(op->args[0]);
|
|
ts->state = TS_DEAD;
|
|
la_reset_pref(ts);
|
|
break;
|
|
|
|
case INDEX_op_add2_i32:
|
|
opc_new = INDEX_op_add_i32;
|
|
goto do_addsub2;
|
|
case INDEX_op_sub2_i32:
|
|
opc_new = INDEX_op_sub_i32;
|
|
goto do_addsub2;
|
|
case INDEX_op_add2_i64:
|
|
opc_new = INDEX_op_add_i64;
|
|
goto do_addsub2;
|
|
case INDEX_op_sub2_i64:
|
|
opc_new = INDEX_op_sub_i64;
|
|
do_addsub2:
|
|
nb_iargs = 4;
|
|
nb_oargs = 2;
|
|
/* Test if the high part of the operation is dead, but not
|
|
the low part. The result can be optimized to a simple
|
|
add or sub. This happens often for x86_64 guest when the
|
|
cpu mode is set to 32 bit. */
|
|
if (arg_temp(op->args[1])->state == TS_DEAD) {
|
|
if (arg_temp(op->args[0])->state == TS_DEAD) {
|
|
goto do_remove;
|
|
}
|
|
/* Replace the opcode and adjust the args in place,
|
|
leaving 3 unused args at the end. */
|
|
op->opc = opc = opc_new;
|
|
op->args[1] = op->args[2];
|
|
op->args[2] = op->args[4];
|
|
/* Fall through and mark the single-word operation live. */
|
|
nb_iargs = 2;
|
|
nb_oargs = 1;
|
|
}
|
|
goto do_not_remove;
|
|
|
|
case INDEX_op_mulu2_i32:
|
|
opc_new = INDEX_op_mul_i32;
|
|
opc_new2 = INDEX_op_muluh_i32;
|
|
have_opc_new2 = TCG_TARGET_HAS_muluh_i32;
|
|
goto do_mul2;
|
|
case INDEX_op_muls2_i32:
|
|
opc_new = INDEX_op_mul_i32;
|
|
opc_new2 = INDEX_op_mulsh_i32;
|
|
have_opc_new2 = TCG_TARGET_HAS_mulsh_i32;
|
|
goto do_mul2;
|
|
case INDEX_op_mulu2_i64:
|
|
opc_new = INDEX_op_mul_i64;
|
|
opc_new2 = INDEX_op_muluh_i64;
|
|
have_opc_new2 = TCG_TARGET_HAS_muluh_i64;
|
|
goto do_mul2;
|
|
case INDEX_op_muls2_i64:
|
|
opc_new = INDEX_op_mul_i64;
|
|
opc_new2 = INDEX_op_mulsh_i64;
|
|
have_opc_new2 = TCG_TARGET_HAS_mulsh_i64;
|
|
goto do_mul2;
|
|
do_mul2:
|
|
nb_iargs = 2;
|
|
nb_oargs = 2;
|
|
if (arg_temp(op->args[1])->state == TS_DEAD) {
|
|
if (arg_temp(op->args[0])->state == TS_DEAD) {
|
|
/* Both parts of the operation are dead. */
|
|
goto do_remove;
|
|
}
|
|
/* The high part of the operation is dead; generate the low. */
|
|
op->opc = opc = opc_new;
|
|
op->args[1] = op->args[2];
|
|
op->args[2] = op->args[3];
|
|
} else if (arg_temp(op->args[0])->state == TS_DEAD && have_opc_new2) {
|
|
/* The low part of the operation is dead; generate the high. */
|
|
op->opc = opc = opc_new2;
|
|
op->args[0] = op->args[1];
|
|
op->args[1] = op->args[2];
|
|
op->args[2] = op->args[3];
|
|
} else {
|
|
goto do_not_remove;
|
|
}
|
|
/* Mark the single-word operation live. */
|
|
nb_oargs = 1;
|
|
goto do_not_remove;
|
|
|
|
default:
|
|
/* XXX: optimize by hardcoding common cases (e.g. triadic ops) */
|
|
nb_iargs = def->nb_iargs;
|
|
nb_oargs = def->nb_oargs;
|
|
|
|
/* Test if the operation can be removed because all
|
|
its outputs are dead. We assume that nb_oargs == 0
|
|
implies side effects */
|
|
if (!(def->flags & TCG_OPF_SIDE_EFFECTS) && nb_oargs != 0) {
|
|
for (i = 0; i < nb_oargs; i++) {
|
|
if (arg_temp(op->args[i])->state != TS_DEAD) {
|
|
goto do_not_remove;
|
|
}
|
|
}
|
|
goto do_remove;
|
|
}
|
|
goto do_not_remove;
|
|
|
|
do_remove:
|
|
tcg_op_remove(s, op);
|
|
break;
|
|
|
|
do_not_remove:
|
|
for (i = 0; i < nb_oargs; i++) {
|
|
ts = arg_temp(op->args[i]);
|
|
|
|
/* Remember the preference of the uses that followed. */
|
|
op->output_pref[i] = *la_temp_pref(ts);
|
|
|
|
/* Output args are dead. */
|
|
if (ts->state & TS_DEAD) {
|
|
arg_life |= DEAD_ARG << i;
|
|
}
|
|
if (ts->state & TS_MEM) {
|
|
arg_life |= SYNC_ARG << i;
|
|
}
|
|
ts->state = TS_DEAD;
|
|
la_reset_pref(ts);
|
|
}
|
|
|
|
/* If end of basic block, update. */
|
|
if (def->flags & TCG_OPF_BB_EXIT) {
|
|
la_func_end(s, nb_globals, nb_temps);
|
|
} else if (def->flags & TCG_OPF_BB_END) {
|
|
la_bb_end(s, nb_globals, nb_temps);
|
|
} else if (def->flags & TCG_OPF_SIDE_EFFECTS) {
|
|
la_global_sync(s, nb_globals);
|
|
if (def->flags & TCG_OPF_CALL_CLOBBER) {
|
|
la_cross_call(s, nb_temps);
|
|
}
|
|
}
|
|
|
|
/* Record arguments that die in this opcode. */
|
|
for (i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
|
|
ts = arg_temp(op->args[i]);
|
|
if (ts->state & TS_DEAD) {
|
|
arg_life |= DEAD_ARG << i;
|
|
}
|
|
}
|
|
|
|
/* Input arguments are live for preceding opcodes. */
|
|
for (i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
|
|
ts = arg_temp(op->args[i]);
|
|
if (ts->state & TS_DEAD) {
|
|
/* For operands that were dead, initially allow
|
|
all regs for the type. */
|
|
*la_temp_pref(ts) = tcg_target_available_regs[ts->type];
|
|
ts->state &= ~TS_DEAD;
|
|
}
|
|
}
|
|
|
|
/* Incorporate constraints for this operand. */
|
|
switch (opc) {
|
|
case INDEX_op_mov_i32:
|
|
case INDEX_op_mov_i64:
|
|
/* Note that these are TCG_OPF_NOT_PRESENT and do not
|
|
have proper constraints. That said, special case
|
|
moves to propagate preferences backward. */
|
|
if (IS_DEAD_ARG(1)) {
|
|
*la_temp_pref(arg_temp(op->args[0]))
|
|
= *la_temp_pref(arg_temp(op->args[1]));
|
|
}
|
|
break;
|
|
|
|
default:
|
|
for (i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
|
|
const TCGArgConstraint *ct = &def->args_ct[i];
|
|
TCGRegSet set, *pset;
|
|
|
|
ts = arg_temp(op->args[i]);
|
|
pset = la_temp_pref(ts);
|
|
set = *pset;
|
|
|
|
set &= ct->u.regs;
|
|
if (ct->ct & TCG_CT_IALIAS) {
|
|
set &= op->output_pref[ct->alias_index];
|
|
}
|
|
/* If the combination is not possible, restart. */
|
|
if (set == 0) {
|
|
set = ct->u.regs;
|
|
}
|
|
*pset = set;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
op->life = arg_life;
|
|
}
|
|
}
|
|
|
|
/* Liveness analysis: Convert indirect regs to direct temporaries. */
|
|
static bool liveness_pass_2(TCGContext *s)
|
|
{
|
|
int nb_globals = s->nb_globals;
|
|
int nb_temps, i;
|
|
bool changes = false;
|
|
TCGOp *op, *op_next;
|
|
|
|
/* Create a temporary for each indirect global. */
|
|
for (i = 0; i < nb_globals; ++i) {
|
|
TCGTemp *its = &s->temps[i];
|
|
if (its->indirect_reg) {
|
|
TCGTemp *dts = tcg_temp_alloc(s);
|
|
dts->type = its->type;
|
|
dts->base_type = its->base_type;
|
|
its->state_ptr = dts;
|
|
} else {
|
|
its->state_ptr = NULL;
|
|
}
|
|
/* All globals begin dead. */
|
|
its->state = TS_DEAD;
|
|
}
|
|
for (nb_temps = s->nb_temps; i < nb_temps; ++i) {
|
|
TCGTemp *its = &s->temps[i];
|
|
its->state_ptr = NULL;
|
|
its->state = TS_DEAD;
|
|
}
|
|
|
|
QTAILQ_FOREACH_SAFE(op, &s->ops, link, op_next) {
|
|
TCGOpcode opc = op->opc;
|
|
const TCGOpDef *def = &tcg_op_defs[opc];
|
|
TCGLifeData arg_life = op->life;
|
|
int nb_iargs, nb_oargs, call_flags;
|
|
TCGTemp *arg_ts, *dir_ts;
|
|
|
|
if (opc == INDEX_op_call) {
|
|
nb_oargs = TCGOP_CALLO(op);
|
|
nb_iargs = TCGOP_CALLI(op);
|
|
call_flags = op->args[nb_oargs + nb_iargs + 1];
|
|
} else {
|
|
nb_iargs = def->nb_iargs;
|
|
nb_oargs = def->nb_oargs;
|
|
|
|
/* Set flags similar to how calls require. */
|
|
if (def->flags & TCG_OPF_BB_END) {
|
|
/* Like writing globals: save_globals */
|
|
call_flags = 0;
|
|
} else if (def->flags & TCG_OPF_SIDE_EFFECTS) {
|
|
/* Like reading globals: sync_globals */
|
|
call_flags = TCG_CALL_NO_WRITE_GLOBALS;
|
|
} else {
|
|
/* No effect on globals. */
|
|
call_flags = (TCG_CALL_NO_READ_GLOBALS |
|
|
TCG_CALL_NO_WRITE_GLOBALS);
|
|
}
|
|
}
|
|
|
|
/* Make sure that input arguments are available. */
|
|
for (i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
|
|
arg_ts = arg_temp(op->args[i]);
|
|
if (arg_ts) {
|
|
dir_ts = arg_ts->state_ptr;
|
|
if (dir_ts && arg_ts->state == TS_DEAD) {
|
|
TCGOpcode lopc = (arg_ts->type == TCG_TYPE_I32
|
|
? INDEX_op_ld_i32
|
|
: INDEX_op_ld_i64);
|
|
TCGOp *lop = tcg_op_insert_before(s, op, lopc);
|
|
|
|
lop->args[0] = temp_arg(dir_ts);
|
|
lop->args[1] = temp_arg(arg_ts->mem_base);
|
|
lop->args[2] = arg_ts->mem_offset;
|
|
|
|
/* Loaded, but synced with memory. */
|
|
arg_ts->state = TS_MEM;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Perform input replacement, and mark inputs that became dead.
|
|
No action is required except keeping temp_state up to date
|
|
so that we reload when needed. */
|
|
for (i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
|
|
arg_ts = arg_temp(op->args[i]);
|
|
if (arg_ts) {
|
|
dir_ts = arg_ts->state_ptr;
|
|
if (dir_ts) {
|
|
op->args[i] = temp_arg(dir_ts);
|
|
changes = true;
|
|
if (IS_DEAD_ARG(i)) {
|
|
arg_ts->state = TS_DEAD;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Liveness analysis should ensure that the following are
|
|
all correct, for call sites and basic block end points. */
|
|
if (call_flags & TCG_CALL_NO_READ_GLOBALS) {
|
|
/* Nothing to do */
|
|
} else if (call_flags & TCG_CALL_NO_WRITE_GLOBALS) {
|
|
for (i = 0; i < nb_globals; ++i) {
|
|
/* Liveness should see that globals are synced back,
|
|
that is, either TS_DEAD or TS_MEM. */
|
|
arg_ts = &s->temps[i];
|
|
tcg_debug_assert(arg_ts->state_ptr == 0
|
|
|| arg_ts->state != 0);
|
|
}
|
|
} else {
|
|
for (i = 0; i < nb_globals; ++i) {
|
|
/* Liveness should see that globals are saved back,
|
|
that is, TS_DEAD, waiting to be reloaded. */
|
|
arg_ts = &s->temps[i];
|
|
tcg_debug_assert(arg_ts->state_ptr == 0
|
|
|| arg_ts->state == TS_DEAD);
|
|
}
|
|
}
|
|
|
|
/* Outputs become available. */
|
|
for (i = 0; i < nb_oargs; i++) {
|
|
arg_ts = arg_temp(op->args[i]);
|
|
dir_ts = arg_ts->state_ptr;
|
|
if (!dir_ts) {
|
|
continue;
|
|
}
|
|
op->args[i] = temp_arg(dir_ts);
|
|
changes = true;
|
|
|
|
/* The output is now live and modified. */
|
|
arg_ts->state = 0;
|
|
|
|
/* Sync outputs upon their last write. */
|
|
if (NEED_SYNC_ARG(i)) {
|
|
TCGOpcode sopc = (arg_ts->type == TCG_TYPE_I32
|
|
? INDEX_op_st_i32
|
|
: INDEX_op_st_i64);
|
|
TCGOp *sop = tcg_op_insert_after(s, op, sopc);
|
|
|
|
sop->args[0] = temp_arg(dir_ts);
|
|
sop->args[1] = temp_arg(arg_ts->mem_base);
|
|
sop->args[2] = arg_ts->mem_offset;
|
|
|
|
arg_ts->state = TS_MEM;
|
|
}
|
|
/* Drop outputs that are dead. */
|
|
if (IS_DEAD_ARG(i)) {
|
|
arg_ts->state = TS_DEAD;
|
|
}
|
|
}
|
|
}
|
|
|
|
return changes;
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_TCG
|
|
static void dump_regs(TCGContext *s)
|
|
{
|
|
TCGTemp *ts;
|
|
int i;
|
|
char buf[64];
|
|
|
|
for(i = 0; i < s->nb_temps; i++) {
|
|
ts = &s->temps[i];
|
|
printf(" %10s: ", tcg_get_arg_str_ptr(s, buf, sizeof(buf), ts));
|
|
switch(ts->val_type) {
|
|
case TEMP_VAL_REG:
|
|
printf("%s", tcg_target_reg_names[ts->reg]);
|
|
break;
|
|
case TEMP_VAL_MEM:
|
|
printf("%d(%s)", (int)ts->mem_offset,
|
|
tcg_target_reg_names[ts->mem_base->reg]);
|
|
break;
|
|
case TEMP_VAL_CONST:
|
|
printf("$0x%" TCG_PRIlx, ts->val);
|
|
break;
|
|
case TEMP_VAL_DEAD:
|
|
printf("D");
|
|
break;
|
|
default:
|
|
printf("???");
|
|
break;
|
|
}
|
|
printf("\n");
|
|
}
|
|
|
|
for(i = 0; i < TCG_TARGET_NB_REGS; i++) {
|
|
if (s->reg_to_temp[i] != NULL) {
|
|
printf("%s: %s\n",
|
|
tcg_target_reg_names[i],
|
|
tcg_get_arg_str_ptr(s, buf, sizeof(buf), s->reg_to_temp[i]));
|
|
}
|
|
}
|
|
}
|
|
|
|
static void check_regs(TCGContext *s)
|
|
{
|
|
int reg;
|
|
int k;
|
|
TCGTemp *ts;
|
|
char buf[64];
|
|
|
|
for (reg = 0; reg < TCG_TARGET_NB_REGS; reg++) {
|
|
ts = s->reg_to_temp[reg];
|
|
if (ts != NULL) {
|
|
if (ts->val_type != TEMP_VAL_REG || ts->reg != reg) {
|
|
printf("Inconsistency for register %s:\n",
|
|
tcg_target_reg_names[reg]);
|
|
goto fail;
|
|
}
|
|
}
|
|
}
|
|
for (k = 0; k < s->nb_temps; k++) {
|
|
ts = &s->temps[k];
|
|
if (ts->val_type == TEMP_VAL_REG && !ts->fixed_reg
|
|
&& s->reg_to_temp[ts->reg] != ts) {
|
|
printf("Inconsistency for temp %s:\n",
|
|
tcg_get_arg_str_ptr(s, buf, sizeof(buf), ts));
|
|
fail:
|
|
printf("reg state:\n");
|
|
dump_regs(s);
|
|
tcg_abort();
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static void temp_allocate_frame(TCGContext *s, TCGTemp *ts)
|
|
{
|
|
#if !(defined(__sparc__) && TCG_TARGET_REG_BITS == 64)
|
|
/* Sparc64 stack is accessed with offset of 2047 */
|
|
s->current_frame_offset = (s->current_frame_offset +
|
|
(tcg_target_long)sizeof(tcg_target_long) - 1) &
|
|
~(sizeof(tcg_target_long) - 1);
|
|
#endif
|
|
if (s->current_frame_offset + (tcg_target_long)sizeof(tcg_target_long) >
|
|
s->frame_end) {
|
|
tcg_abort();
|
|
}
|
|
ts->mem_offset = s->current_frame_offset;
|
|
ts->mem_base = s->frame_temp;
|
|
ts->mem_allocated = 1;
|
|
s->current_frame_offset += sizeof(tcg_target_long);
|
|
}
|
|
|
|
static void temp_load(TCGContext *, TCGTemp *, TCGRegSet, TCGRegSet, TCGRegSet);
|
|
|
|
/* Mark a temporary as free or dead. If 'free_or_dead' is negative,
|
|
mark it free; otherwise mark it dead. */
|
|
static void temp_free_or_dead(TCGContext *s, TCGTemp *ts, int free_or_dead)
|
|
{
|
|
if (ts->fixed_reg) {
|
|
return;
|
|
}
|
|
if (ts->val_type == TEMP_VAL_REG) {
|
|
s->reg_to_temp[ts->reg] = NULL;
|
|
}
|
|
ts->val_type = (free_or_dead < 0
|
|
|| ts->temp_local
|
|
|| ts->temp_global
|
|
? TEMP_VAL_MEM : TEMP_VAL_DEAD);
|
|
}
|
|
|
|
/* Mark a temporary as dead. */
|
|
static inline void temp_dead(TCGContext *s, TCGTemp *ts)
|
|
{
|
|
temp_free_or_dead(s, ts, 1);
|
|
}
|
|
|
|
/* Sync a temporary to memory. 'allocated_regs' is used in case a temporary
|
|
registers needs to be allocated to store a constant. If 'free_or_dead'
|
|
is non-zero, subsequently release the temporary; if it is positive, the
|
|
temp is dead; if it is negative, the temp is free. */
|
|
static void temp_sync(TCGContext *s, TCGTemp *ts, TCGRegSet allocated_regs,
|
|
TCGRegSet preferred_regs, int free_or_dead)
|
|
{
|
|
if (ts->fixed_reg) {
|
|
return;
|
|
}
|
|
if (!ts->mem_coherent) {
|
|
if (!ts->mem_allocated) {
|
|
temp_allocate_frame(s, ts);
|
|
}
|
|
switch (ts->val_type) {
|
|
case TEMP_VAL_CONST:
|
|
/* If we're going to free the temp immediately, then we won't
|
|
require it later in a register, so attempt to store the
|
|
constant to memory directly. */
|
|
if (free_or_dead
|
|
&& tcg_out_sti(s, ts->type, ts->val,
|
|
ts->mem_base->reg, ts->mem_offset)) {
|
|
break;
|
|
}
|
|
temp_load(s, ts, tcg_target_available_regs[ts->type],
|
|
allocated_regs, preferred_regs);
|
|
/* fallthrough */
|
|
|
|
case TEMP_VAL_REG:
|
|
tcg_out_st(s, ts->type, ts->reg,
|
|
ts->mem_base->reg, ts->mem_offset);
|
|
break;
|
|
|
|
case TEMP_VAL_MEM:
|
|
break;
|
|
|
|
case TEMP_VAL_DEAD:
|
|
default:
|
|
tcg_abort();
|
|
}
|
|
ts->mem_coherent = 1;
|
|
}
|
|
if (free_or_dead) {
|
|
temp_free_or_dead(s, ts, free_or_dead);
|
|
}
|
|
}
|
|
|
|
/* free register 'reg' by spilling the corresponding temporary if necessary */
|
|
static void tcg_reg_free(TCGContext *s, TCGReg reg, TCGRegSet allocated_regs)
|
|
{
|
|
TCGTemp *ts = s->reg_to_temp[reg];
|
|
if (ts != NULL) {
|
|
temp_sync(s, ts, allocated_regs, 0, -1);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tcg_reg_alloc:
|
|
* @required_regs: Set of registers in which we must allocate.
|
|
* @allocated_regs: Set of registers which must be avoided.
|
|
* @preferred_regs: Set of registers we should prefer.
|
|
* @rev: True if we search the registers in "indirect" order.
|
|
*
|
|
* The allocated register must be in @required_regs & ~@allocated_regs,
|
|
* but if we can put it in @preferred_regs we may save a move later.
|
|
*/
|
|
static TCGReg tcg_reg_alloc(TCGContext *s, TCGRegSet required_regs,
|
|
TCGRegSet allocated_regs,
|
|
TCGRegSet preferred_regs, bool rev)
|
|
{
|
|
int i, j, f, n = ARRAY_SIZE(tcg_target_reg_alloc_order);
|
|
TCGRegSet reg_ct[2];
|
|
const int *order;
|
|
|
|
reg_ct[1] = required_regs & ~allocated_regs;
|
|
tcg_debug_assert(reg_ct[1] != 0);
|
|
reg_ct[0] = reg_ct[1] & preferred_regs;
|
|
|
|
/* Skip the preferred_regs option if it cannot be satisfied,
|
|
or if the preference made no difference. */
|
|
f = reg_ct[0] == 0 || reg_ct[0] == reg_ct[1];
|
|
|
|
order = rev ? indirect_reg_alloc_order : tcg_target_reg_alloc_order;
|
|
|
|
/* Try free registers, preferences first. */
|
|
for (j = f; j < 2; j++) {
|
|
TCGRegSet set = reg_ct[j];
|
|
|
|
if (tcg_regset_single(set)) {
|
|
/* One register in the set. */
|
|
TCGReg reg = tcg_regset_first(set);
|
|
if (s->reg_to_temp[reg] == NULL) {
|
|
return reg;
|
|
}
|
|
} else {
|
|
for (i = 0; i < n; i++) {
|
|
TCGReg reg = order[i];
|
|
if (s->reg_to_temp[reg] == NULL &&
|
|
tcg_regset_test_reg(set, reg)) {
|
|
return reg;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* We must spill something. */
|
|
for (j = f; j < 2; j++) {
|
|
TCGRegSet set = reg_ct[j];
|
|
|
|
if (tcg_regset_single(set)) {
|
|
/* One register in the set. */
|
|
TCGReg reg = tcg_regset_first(set);
|
|
tcg_reg_free(s, reg, allocated_regs);
|
|
return reg;
|
|
} else {
|
|
for (i = 0; i < n; i++) {
|
|
TCGReg reg = order[i];
|
|
if (tcg_regset_test_reg(set, reg)) {
|
|
tcg_reg_free(s, reg, allocated_regs);
|
|
return reg;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
tcg_abort();
|
|
}
|
|
|
|
/* Make sure the temporary is in a register. If needed, allocate the register
|
|
from DESIRED while avoiding ALLOCATED. */
|
|
static void temp_load(TCGContext *s, TCGTemp *ts, TCGRegSet desired_regs,
|
|
TCGRegSet allocated_regs, TCGRegSet preferred_regs)
|
|
{
|
|
TCGReg reg;
|
|
|
|
switch (ts->val_type) {
|
|
case TEMP_VAL_REG:
|
|
return;
|
|
case TEMP_VAL_CONST:
|
|
reg = tcg_reg_alloc(s, desired_regs, allocated_regs,
|
|
preferred_regs, ts->indirect_base);
|
|
tcg_out_movi(s, ts->type, reg, ts->val);
|
|
ts->mem_coherent = 0;
|
|
break;
|
|
case TEMP_VAL_MEM:
|
|
reg = tcg_reg_alloc(s, desired_regs, allocated_regs,
|
|
preferred_regs, ts->indirect_base);
|
|
tcg_out_ld(s, ts->type, reg, ts->mem_base->reg, ts->mem_offset);
|
|
ts->mem_coherent = 1;
|
|
break;
|
|
case TEMP_VAL_DEAD:
|
|
default:
|
|
tcg_abort();
|
|
}
|
|
ts->reg = reg;
|
|
ts->val_type = TEMP_VAL_REG;
|
|
s->reg_to_temp[reg] = ts;
|
|
}
|
|
|
|
/* Save a temporary to memory. 'allocated_regs' is used in case a
|
|
temporary registers needs to be allocated to store a constant. */
|
|
static void temp_save(TCGContext *s, TCGTemp *ts, TCGRegSet allocated_regs)
|
|
{
|
|
/* The liveness analysis already ensures that globals are back
|
|
in memory. Keep an tcg_debug_assert for safety. */
|
|
tcg_debug_assert(ts->val_type == TEMP_VAL_MEM || ts->fixed_reg);
|
|
}
|
|
|
|
/* save globals to their canonical location and assume they can be
|
|
modified be the following code. 'allocated_regs' is used in case a
|
|
temporary registers needs to be allocated to store a constant. */
|
|
static void save_globals(TCGContext *s, TCGRegSet allocated_regs)
|
|
{
|
|
int i, n;
|
|
|
|
for (i = 0, n = s->nb_globals; i < n; i++) {
|
|
temp_save(s, &s->temps[i], allocated_regs);
|
|
}
|
|
}
|
|
|
|
/* sync globals to their canonical location and assume they can be
|
|
read by the following code. 'allocated_regs' is used in case a
|
|
temporary registers needs to be allocated to store a constant. */
|
|
static void sync_globals(TCGContext *s, TCGRegSet allocated_regs)
|
|
{
|
|
int i, n;
|
|
|
|
for (i = 0, n = s->nb_globals; i < n; i++) {
|
|
TCGTemp *ts = &s->temps[i];
|
|
tcg_debug_assert(ts->val_type != TEMP_VAL_REG
|
|
|| ts->fixed_reg
|
|
|| ts->mem_coherent);
|
|
}
|
|
}
|
|
|
|
/* at the end of a basic block, we assume all temporaries are dead and
|
|
all globals are stored at their canonical location. */
|
|
static void tcg_reg_alloc_bb_end(TCGContext *s, TCGRegSet allocated_regs)
|
|
{
|
|
int i;
|
|
|
|
for (i = s->nb_globals; i < s->nb_temps; i++) {
|
|
TCGTemp *ts = &s->temps[i];
|
|
if (ts->temp_local) {
|
|
temp_save(s, ts, allocated_regs);
|
|
} else {
|
|
/* The liveness analysis already ensures that temps are dead.
|
|
Keep an tcg_debug_assert for safety. */
|
|
tcg_debug_assert(ts->val_type == TEMP_VAL_DEAD);
|
|
}
|
|
}
|
|
|
|
save_globals(s, allocated_regs);
|
|
}
|
|
|
|
static void tcg_reg_alloc_do_movi(TCGContext *s, TCGTemp *ots,
|
|
tcg_target_ulong val, TCGLifeData arg_life,
|
|
TCGRegSet preferred_regs)
|
|
{
|
|
if (ots->fixed_reg) {
|
|
/* For fixed registers, we do not do any constant propagation. */
|
|
tcg_out_movi(s, ots->type, ots->reg, val);
|
|
return;
|
|
}
|
|
|
|
/* The movi is not explicitly generated here. */
|
|
if (ots->val_type == TEMP_VAL_REG) {
|
|
s->reg_to_temp[ots->reg] = NULL;
|
|
}
|
|
ots->val_type = TEMP_VAL_CONST;
|
|
ots->val = val;
|
|
ots->mem_coherent = 0;
|
|
if (NEED_SYNC_ARG(0)) {
|
|
temp_sync(s, ots, s->reserved_regs, preferred_regs, IS_DEAD_ARG(0));
|
|
} else if (IS_DEAD_ARG(0)) {
|
|
temp_dead(s, ots);
|
|
}
|
|
}
|
|
|
|
static void tcg_reg_alloc_movi(TCGContext *s, const TCGOp *op)
|
|
{
|
|
TCGTemp *ots = arg_temp(op->args[0]);
|
|
tcg_target_ulong val = op->args[1];
|
|
|
|
tcg_reg_alloc_do_movi(s, ots, val, op->life, op->output_pref[0]);
|
|
}
|
|
|
|
static void tcg_reg_alloc_mov(TCGContext *s, const TCGOp *op)
|
|
{
|
|
const TCGLifeData arg_life = op->life;
|
|
TCGRegSet allocated_regs, preferred_regs;
|
|
TCGTemp *ts, *ots;
|
|
TCGType otype, itype;
|
|
|
|
allocated_regs = s->reserved_regs;
|
|
preferred_regs = op->output_pref[0];
|
|
ots = arg_temp(op->args[0]);
|
|
ts = arg_temp(op->args[1]);
|
|
|
|
/* Note that otype != itype for no-op truncation. */
|
|
otype = ots->type;
|
|
itype = ts->type;
|
|
|
|
if (ts->val_type == TEMP_VAL_CONST) {
|
|
/* propagate constant or generate sti */
|
|
tcg_target_ulong val = ts->val;
|
|
if (IS_DEAD_ARG(1)) {
|
|
temp_dead(s, ts);
|
|
}
|
|
tcg_reg_alloc_do_movi(s, ots, val, arg_life, preferred_regs);
|
|
return;
|
|
}
|
|
|
|
/* If the source value is in memory we're going to be forced
|
|
to have it in a register in order to perform the copy. Copy
|
|
the SOURCE value into its own register first, that way we
|
|
don't have to reload SOURCE the next time it is used. */
|
|
if (ts->val_type == TEMP_VAL_MEM) {
|
|
temp_load(s, ts, tcg_target_available_regs[itype],
|
|
allocated_regs, preferred_regs);
|
|
}
|
|
|
|
tcg_debug_assert(ts->val_type == TEMP_VAL_REG);
|
|
if (IS_DEAD_ARG(0) && !ots->fixed_reg) {
|
|
/* mov to a non-saved dead register makes no sense (even with
|
|
liveness analysis disabled). */
|
|
tcg_debug_assert(NEED_SYNC_ARG(0));
|
|
if (!ots->mem_allocated) {
|
|
temp_allocate_frame(s, ots);
|
|
}
|
|
tcg_out_st(s, otype, ts->reg, ots->mem_base->reg, ots->mem_offset);
|
|
if (IS_DEAD_ARG(1)) {
|
|
temp_dead(s, ts);
|
|
}
|
|
temp_dead(s, ots);
|
|
} else {
|
|
if (IS_DEAD_ARG(1) && !ts->fixed_reg && !ots->fixed_reg) {
|
|
/* the mov can be suppressed */
|
|
if (ots->val_type == TEMP_VAL_REG) {
|
|
s->reg_to_temp[ots->reg] = NULL;
|
|
}
|
|
ots->reg = ts->reg;
|
|
temp_dead(s, ts);
|
|
} else {
|
|
if (ots->val_type != TEMP_VAL_REG) {
|
|
/* When allocating a new register, make sure to not spill the
|
|
input one. */
|
|
tcg_regset_set_reg(allocated_regs, ts->reg);
|
|
ots->reg = tcg_reg_alloc(s, tcg_target_available_regs[otype],
|
|
allocated_regs, preferred_regs,
|
|
ots->indirect_base);
|
|
}
|
|
tcg_out_mov(s, otype, ots->reg, ts->reg);
|
|
}
|
|
ots->val_type = TEMP_VAL_REG;
|
|
ots->mem_coherent = 0;
|
|
s->reg_to_temp[ots->reg] = ots;
|
|
if (NEED_SYNC_ARG(0)) {
|
|
temp_sync(s, ots, allocated_regs, 0, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
|
|
{
|
|
const TCGLifeData arg_life = op->life;
|
|
const TCGOpDef * const def = &tcg_op_defs[op->opc];
|
|
TCGRegSet i_allocated_regs;
|
|
TCGRegSet o_allocated_regs;
|
|
int i, k, nb_iargs, nb_oargs;
|
|
TCGReg reg;
|
|
TCGArg arg;
|
|
const TCGArgConstraint *arg_ct;
|
|
TCGTemp *ts;
|
|
TCGArg new_args[TCG_MAX_OP_ARGS];
|
|
int const_args[TCG_MAX_OP_ARGS];
|
|
|
|
nb_oargs = def->nb_oargs;
|
|
nb_iargs = def->nb_iargs;
|
|
|
|
/* copy constants */
|
|
memcpy(new_args + nb_oargs + nb_iargs,
|
|
op->args + nb_oargs + nb_iargs,
|
|
sizeof(TCGArg) * def->nb_cargs);
|
|
|
|
i_allocated_regs = s->reserved_regs;
|
|
o_allocated_regs = s->reserved_regs;
|
|
|
|
/* satisfy input constraints */
|
|
for (k = 0; k < nb_iargs; k++) {
|
|
TCGRegSet i_preferred_regs, o_preferred_regs;
|
|
|
|
i = def->sorted_args[nb_oargs + k];
|
|
arg = op->args[i];
|
|
arg_ct = &def->args_ct[i];
|
|
ts = arg_temp(arg);
|
|
|
|
if (ts->val_type == TEMP_VAL_CONST
|
|
&& tcg_target_const_match(ts->val, ts->type, arg_ct)) {
|
|
/* constant is OK for instruction */
|
|
const_args[i] = 1;
|
|
new_args[i] = ts->val;
|
|
continue;
|
|
}
|
|
|
|
i_preferred_regs = o_preferred_regs = 0;
|
|
if (arg_ct->ct & TCG_CT_IALIAS) {
|
|
o_preferred_regs = op->output_pref[arg_ct->alias_index];
|
|
if (ts->fixed_reg) {
|
|
/* if fixed register, we must allocate a new register
|
|
if the alias is not the same register */
|
|
if (arg != op->args[arg_ct->alias_index]) {
|
|
goto allocate_in_reg;
|
|
}
|
|
} else {
|
|
/* if the input is aliased to an output and if it is
|
|
not dead after the instruction, we must allocate
|
|
a new register and move it */
|
|
if (!IS_DEAD_ARG(i)) {
|
|
goto allocate_in_reg;
|
|
}
|
|
|
|
/* check if the current register has already been allocated
|
|
for another input aliased to an output */
|
|
if (ts->val_type == TEMP_VAL_REG) {
|
|
int k2, i2;
|
|
reg = ts->reg;
|
|
for (k2 = 0 ; k2 < k ; k2++) {
|
|
i2 = def->sorted_args[nb_oargs + k2];
|
|
if ((def->args_ct[i2].ct & TCG_CT_IALIAS) &&
|
|
reg == new_args[i2]) {
|
|
goto allocate_in_reg;
|
|
}
|
|
}
|
|
}
|
|
i_preferred_regs = o_preferred_regs;
|
|
}
|
|
}
|
|
|
|
temp_load(s, ts, arg_ct->u.regs, i_allocated_regs, i_preferred_regs);
|
|
reg = ts->reg;
|
|
|
|
if (tcg_regset_test_reg(arg_ct->u.regs, reg)) {
|
|
/* nothing to do : the constraint is satisfied */
|
|
} else {
|
|
allocate_in_reg:
|
|
/* allocate a new register matching the constraint
|
|
and move the temporary register into it */
|
|
temp_load(s, ts, tcg_target_available_regs[ts->type],
|
|
i_allocated_regs, 0);
|
|
reg = tcg_reg_alloc(s, arg_ct->u.regs, i_allocated_regs,
|
|
o_preferred_regs, ts->indirect_base);
|
|
tcg_out_mov(s, ts->type, reg, ts->reg);
|
|
}
|
|
new_args[i] = reg;
|
|
const_args[i] = 0;
|
|
tcg_regset_set_reg(i_allocated_regs, reg);
|
|
}
|
|
|
|
/* mark dead temporaries and free the associated registers */
|
|
for (i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
|
|
if (IS_DEAD_ARG(i)) {
|
|
temp_dead(s, arg_temp(op->args[i]));
|
|
}
|
|
}
|
|
|
|
if (def->flags & TCG_OPF_BB_END) {
|
|
tcg_reg_alloc_bb_end(s, i_allocated_regs);
|
|
} else {
|
|
if (def->flags & TCG_OPF_CALL_CLOBBER) {
|
|
/* XXX: permit generic clobber register list ? */
|
|
for (i = 0; i < TCG_TARGET_NB_REGS; i++) {
|
|
if (tcg_regset_test_reg(tcg_target_call_clobber_regs, i)) {
|
|
tcg_reg_free(s, i, i_allocated_regs);
|
|
}
|
|
}
|
|
}
|
|
if (def->flags & TCG_OPF_SIDE_EFFECTS) {
|
|
/* sync globals if the op has side effects and might trigger
|
|
an exception. */
|
|
sync_globals(s, i_allocated_regs);
|
|
}
|
|
|
|
/* satisfy the output constraints */
|
|
for(k = 0; k < nb_oargs; k++) {
|
|
i = def->sorted_args[k];
|
|
arg = op->args[i];
|
|
arg_ct = &def->args_ct[i];
|
|
ts = arg_temp(arg);
|
|
if ((arg_ct->ct & TCG_CT_ALIAS)
|
|
&& !const_args[arg_ct->alias_index]) {
|
|
reg = new_args[arg_ct->alias_index];
|
|
} else if (arg_ct->ct & TCG_CT_NEWREG) {
|
|
reg = tcg_reg_alloc(s, arg_ct->u.regs,
|
|
i_allocated_regs | o_allocated_regs,
|
|
op->output_pref[k], ts->indirect_base);
|
|
} else {
|
|
/* if fixed register, we try to use it */
|
|
reg = ts->reg;
|
|
if (ts->fixed_reg &&
|
|
tcg_regset_test_reg(arg_ct->u.regs, reg)) {
|
|
goto oarg_end;
|
|
}
|
|
reg = tcg_reg_alloc(s, arg_ct->u.regs, o_allocated_regs,
|
|
op->output_pref[k], ts->indirect_base);
|
|
}
|
|
tcg_regset_set_reg(o_allocated_regs, reg);
|
|
/* if a fixed register is used, then a move will be done afterwards */
|
|
if (!ts->fixed_reg) {
|
|
if (ts->val_type == TEMP_VAL_REG) {
|
|
s->reg_to_temp[ts->reg] = NULL;
|
|
}
|
|
ts->val_type = TEMP_VAL_REG;
|
|
ts->reg = reg;
|
|
/* temp value is modified, so the value kept in memory is
|
|
potentially not the same */
|
|
ts->mem_coherent = 0;
|
|
s->reg_to_temp[reg] = ts;
|
|
}
|
|
oarg_end:
|
|
new_args[i] = reg;
|
|
}
|
|
}
|
|
|
|
/* emit instruction */
|
|
if (def->flags & TCG_OPF_VECTOR) {
|
|
tcg_out_vec_op(s, op->opc, TCGOP_VECL(op), TCGOP_VECE(op),
|
|
new_args, const_args);
|
|
} else {
|
|
tcg_out_op(s, op->opc, new_args, const_args);
|
|
}
|
|
|
|
/* move the outputs in the correct register if needed */
|
|
for(i = 0; i < nb_oargs; i++) {
|
|
ts = arg_temp(op->args[i]);
|
|
reg = new_args[i];
|
|
if (ts->fixed_reg && ts->reg != reg) {
|
|
tcg_out_mov(s, ts->type, ts->reg, reg);
|
|
}
|
|
if (NEED_SYNC_ARG(i)) {
|
|
temp_sync(s, ts, o_allocated_regs, 0, IS_DEAD_ARG(i));
|
|
} else if (IS_DEAD_ARG(i)) {
|
|
temp_dead(s, ts);
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef TCG_TARGET_STACK_GROWSUP
|
|
#define STACK_DIR(x) (-(x))
|
|
#else
|
|
#define STACK_DIR(x) (x)
|
|
#endif
|
|
|
|
static void tcg_reg_alloc_call(TCGContext *s, TCGOp *op)
|
|
{
|
|
const int nb_oargs = TCGOP_CALLO(op);
|
|
const int nb_iargs = TCGOP_CALLI(op);
|
|
const TCGLifeData arg_life = op->life;
|
|
int flags, nb_regs, i;
|
|
TCGReg reg;
|
|
TCGArg arg;
|
|
TCGTemp *ts;
|
|
intptr_t stack_offset;
|
|
size_t call_stack_size;
|
|
tcg_insn_unit *func_addr;
|
|
int allocate_args;
|
|
TCGRegSet allocated_regs;
|
|
|
|
func_addr = (tcg_insn_unit *)(intptr_t)op->args[nb_oargs + nb_iargs];
|
|
flags = op->args[nb_oargs + nb_iargs + 1];
|
|
|
|
nb_regs = ARRAY_SIZE(tcg_target_call_iarg_regs);
|
|
if (nb_regs > nb_iargs) {
|
|
nb_regs = nb_iargs;
|
|
}
|
|
|
|
/* assign stack slots first */
|
|
call_stack_size = (nb_iargs - nb_regs) * sizeof(tcg_target_long);
|
|
call_stack_size = (call_stack_size + TCG_TARGET_STACK_ALIGN - 1) &
|
|
~(TCG_TARGET_STACK_ALIGN - 1);
|
|
allocate_args = (call_stack_size > TCG_STATIC_CALL_ARGS_SIZE);
|
|
if (allocate_args) {
|
|
/* XXX: if more than TCG_STATIC_CALL_ARGS_SIZE is needed,
|
|
preallocate call stack */
|
|
tcg_abort();
|
|
}
|
|
|
|
stack_offset = TCG_TARGET_CALL_STACK_OFFSET;
|
|
for (i = nb_regs; i < nb_iargs; i++) {
|
|
arg = op->args[nb_oargs + i];
|
|
#ifdef TCG_TARGET_STACK_GROWSUP
|
|
stack_offset -= sizeof(tcg_target_long);
|
|
#endif
|
|
if (arg != TCG_CALL_DUMMY_ARG) {
|
|
ts = arg_temp(arg);
|
|
temp_load(s, ts, tcg_target_available_regs[ts->type],
|
|
s->reserved_regs, 0);
|
|
tcg_out_st(s, ts->type, ts->reg, TCG_REG_CALL_STACK, stack_offset);
|
|
}
|
|
#ifndef TCG_TARGET_STACK_GROWSUP
|
|
stack_offset += sizeof(tcg_target_long);
|
|
#endif
|
|
}
|
|
|
|
/* assign input registers */
|
|
allocated_regs = s->reserved_regs;
|
|
for (i = 0; i < nb_regs; i++) {
|
|
arg = op->args[nb_oargs + i];
|
|
if (arg != TCG_CALL_DUMMY_ARG) {
|
|
ts = arg_temp(arg);
|
|
reg = tcg_target_call_iarg_regs[i];
|
|
|
|
if (ts->val_type == TEMP_VAL_REG) {
|
|
if (ts->reg != reg) {
|
|
tcg_reg_free(s, reg, allocated_regs);
|
|
tcg_out_mov(s, ts->type, reg, ts->reg);
|
|
}
|
|
} else {
|
|
TCGRegSet arg_set = 0;
|
|
|
|
tcg_reg_free(s, reg, allocated_regs);
|
|
tcg_regset_set_reg(arg_set, reg);
|
|
temp_load(s, ts, arg_set, allocated_regs, 0);
|
|
}
|
|
|
|
tcg_regset_set_reg(allocated_regs, reg);
|
|
}
|
|
}
|
|
|
|
/* mark dead temporaries and free the associated registers */
|
|
for (i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
|
|
if (IS_DEAD_ARG(i)) {
|
|
temp_dead(s, arg_temp(op->args[i]));
|
|
}
|
|
}
|
|
|
|
/* clobber call registers */
|
|
for (i = 0; i < TCG_TARGET_NB_REGS; i++) {
|
|
if (tcg_regset_test_reg(tcg_target_call_clobber_regs, i)) {
|
|
tcg_reg_free(s, i, allocated_regs);
|
|
}
|
|
}
|
|
|
|
/* Save globals if they might be written by the helper, sync them if
|
|
they might be read. */
|
|
if (flags & TCG_CALL_NO_READ_GLOBALS) {
|
|
/* Nothing to do */
|
|
} else if (flags & TCG_CALL_NO_WRITE_GLOBALS) {
|
|
sync_globals(s, allocated_regs);
|
|
} else {
|
|
save_globals(s, allocated_regs);
|
|
}
|
|
|
|
tcg_out_call(s, func_addr);
|
|
|
|
/* assign output registers and emit moves if needed */
|
|
for(i = 0; i < nb_oargs; i++) {
|
|
arg = op->args[i];
|
|
ts = arg_temp(arg);
|
|
reg = tcg_target_call_oarg_regs[i];
|
|
tcg_debug_assert(s->reg_to_temp[reg] == NULL);
|
|
|
|
if (ts->fixed_reg) {
|
|
if (ts->reg != reg) {
|
|
tcg_out_mov(s, ts->type, ts->reg, reg);
|
|
}
|
|
} else {
|
|
if (ts->val_type == TEMP_VAL_REG) {
|
|
s->reg_to_temp[ts->reg] = NULL;
|
|
}
|
|
ts->val_type = TEMP_VAL_REG;
|
|
ts->reg = reg;
|
|
ts->mem_coherent = 0;
|
|
s->reg_to_temp[reg] = ts;
|
|
if (NEED_SYNC_ARG(i)) {
|
|
temp_sync(s, ts, allocated_regs, 0, IS_DEAD_ARG(i));
|
|
} else if (IS_DEAD_ARG(i)) {
|
|
temp_dead(s, ts);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_PROFILER
|
|
|
|
/* avoid copy/paste errors */
|
|
#define PROF_ADD(to, from, field) \
|
|
do { \
|
|
(to)->field += atomic_read(&((from)->field)); \
|
|
} while (0)
|
|
|
|
#define PROF_MAX(to, from, field) \
|
|
do { \
|
|
typeof((from)->field) val__ = atomic_read(&((from)->field)); \
|
|
if (val__ > (to)->field) { \
|
|
(to)->field = val__; \
|
|
} \
|
|
} while (0)
|
|
|
|
/* Pass in a zero'ed @prof */
|
|
static inline
|
|
void tcg_profile_snapshot(TCGProfile *prof, bool counters, bool table)
|
|
{
|
|
unsigned int n_ctxs = atomic_read(&n_tcg_ctxs);
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < n_ctxs; i++) {
|
|
TCGContext *s = atomic_read(&tcg_ctxs[i]);
|
|
const TCGProfile *orig = &s->prof;
|
|
|
|
if (counters) {
|
|
PROF_ADD(prof, orig, cpu_exec_time);
|
|
PROF_ADD(prof, orig, tb_count1);
|
|
PROF_ADD(prof, orig, tb_count);
|
|
PROF_ADD(prof, orig, op_count);
|
|
PROF_MAX(prof, orig, op_count_max);
|
|
PROF_ADD(prof, orig, temp_count);
|
|
PROF_MAX(prof, orig, temp_count_max);
|
|
PROF_ADD(prof, orig, del_op_count);
|
|
PROF_ADD(prof, orig, code_in_len);
|
|
PROF_ADD(prof, orig, code_out_len);
|
|
PROF_ADD(prof, orig, search_out_len);
|
|
PROF_ADD(prof, orig, interm_time);
|
|
PROF_ADD(prof, orig, code_time);
|
|
PROF_ADD(prof, orig, la_time);
|
|
PROF_ADD(prof, orig, opt_time);
|
|
PROF_ADD(prof, orig, restore_count);
|
|
PROF_ADD(prof, orig, restore_time);
|
|
}
|
|
if (table) {
|
|
int i;
|
|
|
|
for (i = 0; i < NB_OPS; i++) {
|
|
PROF_ADD(prof, orig, table_op_count[i]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#undef PROF_ADD
|
|
#undef PROF_MAX
|
|
|
|
static void tcg_profile_snapshot_counters(TCGProfile *prof)
|
|
{
|
|
tcg_profile_snapshot(prof, true, false);
|
|
}
|
|
|
|
static void tcg_profile_snapshot_table(TCGProfile *prof)
|
|
{
|
|
tcg_profile_snapshot(prof, false, true);
|
|
}
|
|
|
|
void tcg_dump_op_count(FILE *f, fprintf_function cpu_fprintf)
|
|
{
|
|
TCGProfile prof = {};
|
|
int i;
|
|
|
|
tcg_profile_snapshot_table(&prof);
|
|
for (i = 0; i < NB_OPS; i++) {
|
|
cpu_fprintf(f, "%s %" PRId64 "\n", tcg_op_defs[i].name,
|
|
prof.table_op_count[i]);
|
|
}
|
|
}
|
|
|
|
int64_t tcg_cpu_exec_time(void)
|
|
{
|
|
unsigned int n_ctxs = atomic_read(&n_tcg_ctxs);
|
|
unsigned int i;
|
|
int64_t ret = 0;
|
|
|
|
for (i = 0; i < n_ctxs; i++) {
|
|
const TCGContext *s = atomic_read(&tcg_ctxs[i]);
|
|
const TCGProfile *prof = &s->prof;
|
|
|
|
ret += atomic_read(&prof->cpu_exec_time);
|
|
}
|
|
return ret;
|
|
}
|
|
#else
|
|
void tcg_dump_op_count(FILE *f, fprintf_function cpu_fprintf)
|
|
{
|
|
cpu_fprintf(f, "[TCG profiler not compiled]\n");
|
|
}
|
|
|
|
int64_t tcg_cpu_exec_time(void)
|
|
{
|
|
error_report("%s: TCG profiler not compiled", __func__);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
#endif
|
|
|
|
|
|
int tcg_gen_code(TCGContext *s, TranslationBlock *tb)
|
|
{
|
|
#ifdef CONFIG_PROFILER
|
|
TCGProfile *prof = &s->prof;
|
|
#endif
|
|
int i, num_insns;
|
|
TCGOp *op;
|
|
|
|
#ifdef CONFIG_PROFILER
|
|
{
|
|
int n = 0;
|
|
|
|
QTAILQ_FOREACH(op, &s->ops, link) {
|
|
n++;
|
|
}
|
|
atomic_set(&prof->op_count, prof->op_count + n);
|
|
if (n > prof->op_count_max) {
|
|
atomic_set(&prof->op_count_max, n);
|
|
}
|
|
|
|
n = s->nb_temps;
|
|
atomic_set(&prof->temp_count, prof->temp_count + n);
|
|
if (n > prof->temp_count_max) {
|
|
atomic_set(&prof->temp_count_max, n);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef DEBUG_DISAS
|
|
if (unlikely(qemu_loglevel_mask(CPU_LOG_TB_OP)
|
|
&& qemu_log_in_addr_range(tb->pc))) {
|
|
qemu_log_lock();
|
|
qemu_log("OP:\n");
|
|
tcg_dump_ops(s, false);
|
|
qemu_log("\n");
|
|
qemu_log_unlock();
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_TCG
|
|
/* Ensure all labels referenced have been emitted. */
|
|
{
|
|
TCGLabel *l;
|
|
bool error = false;
|
|
|
|
QSIMPLEQ_FOREACH(l, &s->labels, next) {
|
|
if (unlikely(!l->present) && l->refs) {
|
|
qemu_log_mask(CPU_LOG_TB_OP,
|
|
"$L%d referenced but not present.\n", l->id);
|
|
error = true;
|
|
}
|
|
}
|
|
assert(!error);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_PROFILER
|
|
atomic_set(&prof->opt_time, prof->opt_time - profile_getclock());
|
|
#endif
|
|
|
|
#ifdef USE_TCG_OPTIMIZATIONS
|
|
tcg_optimize(s);
|
|
#endif
|
|
|
|
#ifdef CONFIG_PROFILER
|
|
atomic_set(&prof->opt_time, prof->opt_time + profile_getclock());
|
|
atomic_set(&prof->la_time, prof->la_time - profile_getclock());
|
|
#endif
|
|
|
|
reachable_code_pass(s);
|
|
liveness_pass_1(s);
|
|
|
|
if (s->nb_indirects > 0) {
|
|
#ifdef DEBUG_DISAS
|
|
if (unlikely(qemu_loglevel_mask(CPU_LOG_TB_OP_IND)
|
|
&& qemu_log_in_addr_range(tb->pc))) {
|
|
qemu_log_lock();
|
|
qemu_log("OP before indirect lowering:\n");
|
|
tcg_dump_ops(s, false);
|
|
qemu_log("\n");
|
|
qemu_log_unlock();
|
|
}
|
|
#endif
|
|
/* Replace indirect temps with direct temps. */
|
|
if (liveness_pass_2(s)) {
|
|
/* If changes were made, re-run liveness. */
|
|
liveness_pass_1(s);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_PROFILER
|
|
atomic_set(&prof->la_time, prof->la_time + profile_getclock());
|
|
#endif
|
|
|
|
#ifdef DEBUG_DISAS
|
|
if (unlikely(qemu_loglevel_mask(CPU_LOG_TB_OP_OPT)
|
|
&& qemu_log_in_addr_range(tb->pc))) {
|
|
qemu_log_lock();
|
|
qemu_log("OP after optimization and liveness analysis:\n");
|
|
tcg_dump_ops(s, true);
|
|
qemu_log("\n");
|
|
qemu_log_unlock();
|
|
}
|
|
#endif
|
|
|
|
tcg_reg_alloc_start(s);
|
|
|
|
s->code_buf = tb->tc.ptr;
|
|
s->code_ptr = tb->tc.ptr;
|
|
|
|
#ifdef TCG_TARGET_NEED_LDST_LABELS
|
|
QSIMPLEQ_INIT(&s->ldst_labels);
|
|
#endif
|
|
#ifdef TCG_TARGET_NEED_POOL_LABELS
|
|
s->pool_labels = NULL;
|
|
#endif
|
|
|
|
num_insns = -1;
|
|
QTAILQ_FOREACH(op, &s->ops, link) {
|
|
TCGOpcode opc = op->opc;
|
|
|
|
#ifdef CONFIG_PROFILER
|
|
atomic_set(&prof->table_op_count[opc], prof->table_op_count[opc] + 1);
|
|
#endif
|
|
|
|
switch (opc) {
|
|
case INDEX_op_mov_i32:
|
|
case INDEX_op_mov_i64:
|
|
case INDEX_op_mov_vec:
|
|
tcg_reg_alloc_mov(s, op);
|
|
break;
|
|
case INDEX_op_movi_i32:
|
|
case INDEX_op_movi_i64:
|
|
case INDEX_op_dupi_vec:
|
|
tcg_reg_alloc_movi(s, op);
|
|
break;
|
|
case INDEX_op_insn_start:
|
|
if (num_insns >= 0) {
|
|
size_t off = tcg_current_code_size(s);
|
|
s->gen_insn_end_off[num_insns] = off;
|
|
/* Assert that we do not overflow our stored offset. */
|
|
assert(s->gen_insn_end_off[num_insns] == off);
|
|
}
|
|
num_insns++;
|
|
for (i = 0; i < TARGET_INSN_START_WORDS; ++i) {
|
|
target_ulong a;
|
|
#if TARGET_LONG_BITS > TCG_TARGET_REG_BITS
|
|
a = deposit64(op->args[i * 2], 32, 32, op->args[i * 2 + 1]);
|
|
#else
|
|
a = op->args[i];
|
|
#endif
|
|
s->gen_insn_data[num_insns][i] = a;
|
|
}
|
|
break;
|
|
case INDEX_op_discard:
|
|
temp_dead(s, arg_temp(op->args[0]));
|
|
break;
|
|
case INDEX_op_set_label:
|
|
tcg_reg_alloc_bb_end(s, s->reserved_regs);
|
|
tcg_out_label(s, arg_label(op->args[0]), s->code_ptr);
|
|
break;
|
|
case INDEX_op_call:
|
|
tcg_reg_alloc_call(s, op);
|
|
break;
|
|
default:
|
|
/* Sanity check that we've not introduced any unhandled opcodes. */
|
|
tcg_debug_assert(tcg_op_supported(opc));
|
|
/* Note: in order to speed up the code, it would be much
|
|
faster to have specialized register allocator functions for
|
|
some common argument patterns */
|
|
tcg_reg_alloc_op(s, op);
|
|
break;
|
|
}
|
|
#ifdef CONFIG_DEBUG_TCG
|
|
check_regs(s);
|
|
#endif
|
|
/* Test for (pending) buffer overflow. The assumption is that any
|
|
one operation beginning below the high water mark cannot overrun
|
|
the buffer completely. Thus we can test for overflow after
|
|
generating code without having to check during generation. */
|
|
if (unlikely((void *)s->code_ptr > s->code_gen_highwater)) {
|
|
return -1;
|
|
}
|
|
}
|
|
tcg_debug_assert(num_insns >= 0);
|
|
s->gen_insn_end_off[num_insns] = tcg_current_code_size(s);
|
|
|
|
/* Generate TB finalization at the end of block */
|
|
#ifdef TCG_TARGET_NEED_LDST_LABELS
|
|
if (!tcg_out_ldst_finalize(s)) {
|
|
return -1;
|
|
}
|
|
#endif
|
|
#ifdef TCG_TARGET_NEED_POOL_LABELS
|
|
if (!tcg_out_pool_finalize(s)) {
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
/* flush instruction cache */
|
|
flush_icache_range((uintptr_t)s->code_buf, (uintptr_t)s->code_ptr);
|
|
|
|
return tcg_current_code_size(s);
|
|
}
|
|
|
|
#ifdef CONFIG_PROFILER
|
|
void tcg_dump_info(FILE *f, fprintf_function cpu_fprintf)
|
|
{
|
|
TCGProfile prof = {};
|
|
const TCGProfile *s;
|
|
int64_t tb_count;
|
|
int64_t tb_div_count;
|
|
int64_t tot;
|
|
|
|
tcg_profile_snapshot_counters(&prof);
|
|
s = &prof;
|
|
tb_count = s->tb_count;
|
|
tb_div_count = tb_count ? tb_count : 1;
|
|
tot = s->interm_time + s->code_time;
|
|
|
|
cpu_fprintf(f, "JIT cycles %" PRId64 " (%0.3f s at 2.4 GHz)\n",
|
|
tot, tot / 2.4e9);
|
|
cpu_fprintf(f, "translated TBs %" PRId64 " (aborted=%" PRId64 " %0.1f%%)\n",
|
|
tb_count, s->tb_count1 - tb_count,
|
|
(double)(s->tb_count1 - s->tb_count)
|
|
/ (s->tb_count1 ? s->tb_count1 : 1) * 100.0);
|
|
cpu_fprintf(f, "avg ops/TB %0.1f max=%d\n",
|
|
(double)s->op_count / tb_div_count, s->op_count_max);
|
|
cpu_fprintf(f, "deleted ops/TB %0.2f\n",
|
|
(double)s->del_op_count / tb_div_count);
|
|
cpu_fprintf(f, "avg temps/TB %0.2f max=%d\n",
|
|
(double)s->temp_count / tb_div_count, s->temp_count_max);
|
|
cpu_fprintf(f, "avg host code/TB %0.1f\n",
|
|
(double)s->code_out_len / tb_div_count);
|
|
cpu_fprintf(f, "avg search data/TB %0.1f\n",
|
|
(double)s->search_out_len / tb_div_count);
|
|
|
|
cpu_fprintf(f, "cycles/op %0.1f\n",
|
|
s->op_count ? (double)tot / s->op_count : 0);
|
|
cpu_fprintf(f, "cycles/in byte %0.1f\n",
|
|
s->code_in_len ? (double)tot / s->code_in_len : 0);
|
|
cpu_fprintf(f, "cycles/out byte %0.1f\n",
|
|
s->code_out_len ? (double)tot / s->code_out_len : 0);
|
|
cpu_fprintf(f, "cycles/search byte %0.1f\n",
|
|
s->search_out_len ? (double)tot / s->search_out_len : 0);
|
|
if (tot == 0) {
|
|
tot = 1;
|
|
}
|
|
cpu_fprintf(f, " gen_interm time %0.1f%%\n",
|
|
(double)s->interm_time / tot * 100.0);
|
|
cpu_fprintf(f, " gen_code time %0.1f%%\n",
|
|
(double)s->code_time / tot * 100.0);
|
|
cpu_fprintf(f, "optim./code time %0.1f%%\n",
|
|
(double)s->opt_time / (s->code_time ? s->code_time : 1)
|
|
* 100.0);
|
|
cpu_fprintf(f, "liveness/code time %0.1f%%\n",
|
|
(double)s->la_time / (s->code_time ? s->code_time : 1) * 100.0);
|
|
cpu_fprintf(f, "cpu_restore count %" PRId64 "\n",
|
|
s->restore_count);
|
|
cpu_fprintf(f, " avg cycles %0.1f\n",
|
|
s->restore_count ? (double)s->restore_time / s->restore_count : 0);
|
|
}
|
|
#else
|
|
void tcg_dump_info(FILE *f, fprintf_function cpu_fprintf)
|
|
{
|
|
cpu_fprintf(f, "[TCG profiler not compiled]\n");
|
|
}
|
|
#endif
|
|
|
|
#ifdef ELF_HOST_MACHINE
|
|
/* In order to use this feature, the backend needs to do three things:
|
|
|
|
(1) Define ELF_HOST_MACHINE to indicate both what value to
|
|
put into the ELF image and to indicate support for the feature.
|
|
|
|
(2) Define tcg_register_jit. This should create a buffer containing
|
|
the contents of a .debug_frame section that describes the post-
|
|
prologue unwind info for the tcg machine.
|
|
|
|
(3) Call tcg_register_jit_int, with the constructed .debug_frame.
|
|
*/
|
|
|
|
/* Begin GDB interface. THE FOLLOWING MUST MATCH GDB DOCS. */
|
|
typedef enum {
|
|
JIT_NOACTION = 0,
|
|
JIT_REGISTER_FN,
|
|
JIT_UNREGISTER_FN
|
|
} jit_actions_t;
|
|
|
|
struct jit_code_entry {
|
|
struct jit_code_entry *next_entry;
|
|
struct jit_code_entry *prev_entry;
|
|
const void *symfile_addr;
|
|
uint64_t symfile_size;
|
|
};
|
|
|
|
struct jit_descriptor {
|
|
uint32_t version;
|
|
uint32_t action_flag;
|
|
struct jit_code_entry *relevant_entry;
|
|
struct jit_code_entry *first_entry;
|
|
};
|
|
|
|
void __jit_debug_register_code(void) __attribute__((noinline));
|
|
void __jit_debug_register_code(void)
|
|
{
|
|
asm("");
|
|
}
|
|
|
|
/* Must statically initialize the version, because GDB may check
|
|
the version before we can set it. */
|
|
struct jit_descriptor __jit_debug_descriptor = { 1, 0, 0, 0 };
|
|
|
|
/* End GDB interface. */
|
|
|
|
static int find_string(const char *strtab, const char *str)
|
|
{
|
|
const char *p = strtab + 1;
|
|
|
|
while (1) {
|
|
if (strcmp(p, str) == 0) {
|
|
return p - strtab;
|
|
}
|
|
p += strlen(p) + 1;
|
|
}
|
|
}
|
|
|
|
static void tcg_register_jit_int(void *buf_ptr, size_t buf_size,
|
|
const void *debug_frame,
|
|
size_t debug_frame_size)
|
|
{
|
|
struct __attribute__((packed)) DebugInfo {
|
|
uint32_t len;
|
|
uint16_t version;
|
|
uint32_t abbrev;
|
|
uint8_t ptr_size;
|
|
uint8_t cu_die;
|
|
uint16_t cu_lang;
|
|
uintptr_t cu_low_pc;
|
|
uintptr_t cu_high_pc;
|
|
uint8_t fn_die;
|
|
char fn_name[16];
|
|
uintptr_t fn_low_pc;
|
|
uintptr_t fn_high_pc;
|
|
uint8_t cu_eoc;
|
|
};
|
|
|
|
struct ElfImage {
|
|
ElfW(Ehdr) ehdr;
|
|
ElfW(Phdr) phdr;
|
|
ElfW(Shdr) shdr[7];
|
|
ElfW(Sym) sym[2];
|
|
struct DebugInfo di;
|
|
uint8_t da[24];
|
|
char str[80];
|
|
};
|
|
|
|
struct ElfImage *img;
|
|
|
|
static const struct ElfImage img_template = {
|
|
.ehdr = {
|
|
.e_ident[EI_MAG0] = ELFMAG0,
|
|
.e_ident[EI_MAG1] = ELFMAG1,
|
|
.e_ident[EI_MAG2] = ELFMAG2,
|
|
.e_ident[EI_MAG3] = ELFMAG3,
|
|
.e_ident[EI_CLASS] = ELF_CLASS,
|
|
.e_ident[EI_DATA] = ELF_DATA,
|
|
.e_ident[EI_VERSION] = EV_CURRENT,
|
|
.e_type = ET_EXEC,
|
|
.e_machine = ELF_HOST_MACHINE,
|
|
.e_version = EV_CURRENT,
|
|
.e_phoff = offsetof(struct ElfImage, phdr),
|
|
.e_shoff = offsetof(struct ElfImage, shdr),
|
|
.e_ehsize = sizeof(ElfW(Shdr)),
|
|
.e_phentsize = sizeof(ElfW(Phdr)),
|
|
.e_phnum = 1,
|
|
.e_shentsize = sizeof(ElfW(Shdr)),
|
|
.e_shnum = ARRAY_SIZE(img->shdr),
|
|
.e_shstrndx = ARRAY_SIZE(img->shdr) - 1,
|
|
#ifdef ELF_HOST_FLAGS
|
|
.e_flags = ELF_HOST_FLAGS,
|
|
#endif
|
|
#ifdef ELF_OSABI
|
|
.e_ident[EI_OSABI] = ELF_OSABI,
|
|
#endif
|
|
},
|
|
.phdr = {
|
|
.p_type = PT_LOAD,
|
|
.p_flags = PF_X,
|
|
},
|
|
.shdr = {
|
|
[0] = { .sh_type = SHT_NULL },
|
|
/* Trick: The contents of code_gen_buffer are not present in
|
|
this fake ELF file; that got allocated elsewhere. Therefore
|
|
we mark .text as SHT_NOBITS (similar to .bss) so that readers
|
|
will not look for contents. We can record any address. */
|
|
[1] = { /* .text */
|
|
.sh_type = SHT_NOBITS,
|
|
.sh_flags = SHF_EXECINSTR | SHF_ALLOC,
|
|
},
|
|
[2] = { /* .debug_info */
|
|
.sh_type = SHT_PROGBITS,
|
|
.sh_offset = offsetof(struct ElfImage, di),
|
|
.sh_size = sizeof(struct DebugInfo),
|
|
},
|
|
[3] = { /* .debug_abbrev */
|
|
.sh_type = SHT_PROGBITS,
|
|
.sh_offset = offsetof(struct ElfImage, da),
|
|
.sh_size = sizeof(img->da),
|
|
},
|
|
[4] = { /* .debug_frame */
|
|
.sh_type = SHT_PROGBITS,
|
|
.sh_offset = sizeof(struct ElfImage),
|
|
},
|
|
[5] = { /* .symtab */
|
|
.sh_type = SHT_SYMTAB,
|
|
.sh_offset = offsetof(struct ElfImage, sym),
|
|
.sh_size = sizeof(img->sym),
|
|
.sh_info = 1,
|
|
.sh_link = ARRAY_SIZE(img->shdr) - 1,
|
|
.sh_entsize = sizeof(ElfW(Sym)),
|
|
},
|
|
[6] = { /* .strtab */
|
|
.sh_type = SHT_STRTAB,
|
|
.sh_offset = offsetof(struct ElfImage, str),
|
|
.sh_size = sizeof(img->str),
|
|
}
|
|
},
|
|
.sym = {
|
|
[1] = { /* code_gen_buffer */
|
|
.st_info = ELF_ST_INFO(STB_GLOBAL, STT_FUNC),
|
|
.st_shndx = 1,
|
|
}
|
|
},
|
|
.di = {
|
|
.len = sizeof(struct DebugInfo) - 4,
|
|
.version = 2,
|
|
.ptr_size = sizeof(void *),
|
|
.cu_die = 1,
|
|
.cu_lang = 0x8001, /* DW_LANG_Mips_Assembler */
|
|
.fn_die = 2,
|
|
.fn_name = "code_gen_buffer"
|
|
},
|
|
.da = {
|
|
1, /* abbrev number (the cu) */
|
|
0x11, 1, /* DW_TAG_compile_unit, has children */
|
|
0x13, 0x5, /* DW_AT_language, DW_FORM_data2 */
|
|
0x11, 0x1, /* DW_AT_low_pc, DW_FORM_addr */
|
|
0x12, 0x1, /* DW_AT_high_pc, DW_FORM_addr */
|
|
0, 0, /* end of abbrev */
|
|
2, /* abbrev number (the fn) */
|
|
0x2e, 0, /* DW_TAG_subprogram, no children */
|
|
0x3, 0x8, /* DW_AT_name, DW_FORM_string */
|
|
0x11, 0x1, /* DW_AT_low_pc, DW_FORM_addr */
|
|
0x12, 0x1, /* DW_AT_high_pc, DW_FORM_addr */
|
|
0, 0, /* end of abbrev */
|
|
0 /* no more abbrev */
|
|
},
|
|
.str = "\0" ".text\0" ".debug_info\0" ".debug_abbrev\0"
|
|
".debug_frame\0" ".symtab\0" ".strtab\0" "code_gen_buffer",
|
|
};
|
|
|
|
/* We only need a single jit entry; statically allocate it. */
|
|
static struct jit_code_entry one_entry;
|
|
|
|
uintptr_t buf = (uintptr_t)buf_ptr;
|
|
size_t img_size = sizeof(struct ElfImage) + debug_frame_size;
|
|
DebugFrameHeader *dfh;
|
|
|
|
img = g_malloc(img_size);
|
|
*img = img_template;
|
|
|
|
img->phdr.p_vaddr = buf;
|
|
img->phdr.p_paddr = buf;
|
|
img->phdr.p_memsz = buf_size;
|
|
|
|
img->shdr[1].sh_name = find_string(img->str, ".text");
|
|
img->shdr[1].sh_addr = buf;
|
|
img->shdr[1].sh_size = buf_size;
|
|
|
|
img->shdr[2].sh_name = find_string(img->str, ".debug_info");
|
|
img->shdr[3].sh_name = find_string(img->str, ".debug_abbrev");
|
|
|
|
img->shdr[4].sh_name = find_string(img->str, ".debug_frame");
|
|
img->shdr[4].sh_size = debug_frame_size;
|
|
|
|
img->shdr[5].sh_name = find_string(img->str, ".symtab");
|
|
img->shdr[6].sh_name = find_string(img->str, ".strtab");
|
|
|
|
img->sym[1].st_name = find_string(img->str, "code_gen_buffer");
|
|
img->sym[1].st_value = buf;
|
|
img->sym[1].st_size = buf_size;
|
|
|
|
img->di.cu_low_pc = buf;
|
|
img->di.cu_high_pc = buf + buf_size;
|
|
img->di.fn_low_pc = buf;
|
|
img->di.fn_high_pc = buf + buf_size;
|
|
|
|
dfh = (DebugFrameHeader *)(img + 1);
|
|
memcpy(dfh, debug_frame, debug_frame_size);
|
|
dfh->fde.func_start = buf;
|
|
dfh->fde.func_len = buf_size;
|
|
|
|
#ifdef DEBUG_JIT
|
|
/* Enable this block to be able to debug the ELF image file creation.
|
|
One can use readelf, objdump, or other inspection utilities. */
|
|
{
|
|
FILE *f = fopen("/tmp/qemu.jit", "w+b");
|
|
if (f) {
|
|
if (fwrite(img, img_size, 1, f) != img_size) {
|
|
/* Avoid stupid unused return value warning for fwrite. */
|
|
}
|
|
fclose(f);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
one_entry.symfile_addr = img;
|
|
one_entry.symfile_size = img_size;
|
|
|
|
__jit_debug_descriptor.action_flag = JIT_REGISTER_FN;
|
|
__jit_debug_descriptor.relevant_entry = &one_entry;
|
|
__jit_debug_descriptor.first_entry = &one_entry;
|
|
__jit_debug_register_code();
|
|
}
|
|
#else
|
|
/* No support for the feature. Provide the entry point expected by exec.c,
|
|
and implement the internal function we declared earlier. */
|
|
|
|
static void tcg_register_jit_int(void *buf, size_t size,
|
|
const void *debug_frame,
|
|
size_t debug_frame_size)
|
|
{
|
|
}
|
|
|
|
void tcg_register_jit(void *buf, size_t buf_size)
|
|
{
|
|
}
|
|
#endif /* ELF_HOST_MACHINE */
|
|
|
|
#if !TCG_TARGET_MAYBE_vec
|
|
void tcg_expand_vec_op(TCGOpcode o, TCGType t, unsigned e, TCGArg a0, ...)
|
|
{
|
|
g_assert_not_reached();
|
|
}
|
|
#endif
|