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tcg: Add insn_start_words to TCGContext 

This will enable replacement of TARGET_INSN_START_WORDS in tcg.c.
Split out "tcg/insn-start-words.h" and use it in target/.

Reviewed-by: Anton Johansson <anjo@rev.ng>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-03-31 21:30:31 -07:00
parent e03291cd9a
commit 747bd69d0f
9 changed files with 58 additions and 30 deletions
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8
accel/tcg/perf.c
View File

@ -311,7 +311,8 @@ void perf_report_code(uint64_t guest_pc, TranslationBlock *tb,
const void *start)
{
struct debuginfo_query *q;
size_t insn;
size_t insn, start_words;
uint64_t *gen_insn_data;
if (!perfmap && !jitdump) {
return;
@ -325,9 +326,12 @@ void perf_report_code(uint64_t guest_pc, TranslationBlock *tb,
debuginfo_lock();
/* Query debuginfo for each guest instruction. */
gen_insn_data = tcg_ctx->gen_insn_data;
start_words = tcg_ctx->insn_start_words;
for (insn = 0; insn < tb->icount; insn++) {
/* FIXME: This replicates the restore_state_to_opc() logic. */
q[insn].address = tcg_ctx->gen_insn_data[insn][0];
q[insn].address = gen_insn_data[insn * start_words + 0];
if (tb_cflags(tb) & CF_PCREL) {
q[insn].address |= (guest_pc & TARGET_PAGE_MASK);
} else {

20
accel/tcg/translate-all.c
View File

@ -64,6 +64,7 @@
#include "tb-context.h"
#include "internal.h"
#include "perf.h"
#include "tcg/insn-start-words.h"
TBContext tb_ctx;
@ -127,22 +128,26 @@ static int64_t decode_sleb128(const uint8_t **pp)
static int encode_search(TranslationBlock *tb, uint8_t *block)
{
uint8_t *highwater = tcg_ctx->code_gen_highwater;
uint64_t *insn_data = tcg_ctx->gen_insn_data;
uint16_t *insn_end_off = tcg_ctx->gen_insn_end_off;
uint8_t *p = block;
int i, j, n;
for (i = 0, n = tb->icount; i < n; ++i) {
uint64_t prev;
uint64_t prev, curr;
for (j = 0; j < TARGET_INSN_START_WORDS; ++j) {
if (i == 0) {
prev = (!(tb_cflags(tb) & CF_PCREL) && j == 0 ? tb->pc : 0);
} else {
prev = tcg_ctx->gen_insn_data[i - 1][j];
prev = insn_data[(i - 1) * TARGET_INSN_START_WORDS + j];
}
p = encode_sleb128(p, tcg_ctx->gen_insn_data[i][j] - prev);
curr = insn_data[i * TARGET_INSN_START_WORDS + j];
p = encode_sleb128(p, curr - prev);
}
prev = (i == 0 ? 0 : tcg_ctx->gen_insn_end_off[i - 1]);
p = encode_sleb128(p, tcg_ctx->gen_insn_end_off[i] - prev);
prev = (i == 0 ? 0 : insn_end_off[i - 1]);
curr = insn_end_off[i];
p = encode_sleb128(p, curr - prev);
/* Test for (pending) buffer overflow. The assumption is that any
one row beginning below the high water mark cannot overrun
@ -358,6 +363,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
tcg_ctx->tlb_fast_offset =
(int)offsetof(ArchCPU, neg.tlb.f) - (int)offsetof(ArchCPU, env);
#endif
tcg_ctx->insn_start_words = TARGET_INSN_START_WORDS;
tb_overflow:
@ -451,7 +457,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
fprintf(logfile, "OUT: [size=%d]\n", gen_code_size);
fprintf(logfile,
" -- guest addr 0x%016" PRIx64 " + tb prologue\n",
tcg_ctx->gen_insn_data[insn][0]);
tcg_ctx->gen_insn_data[insn * TARGET_INSN_START_WORDS]);
chunk_start = tcg_ctx->gen_insn_end_off[insn];
disas(logfile, tb->tc.ptr, chunk_start);
@ -464,7 +470,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
size_t chunk_end = tcg_ctx->gen_insn_end_off[insn];
if (chunk_end > chunk_start) {
fprintf(logfile, " -- guest addr 0x%016" PRIx64 "\n",
tcg_ctx->gen_insn_data[insn][0]);
tcg_ctx->gen_insn_data[insn * TARGET_INSN_START_WORDS]);
disas(logfile, tb->tc.ptr + chunk_start,
chunk_end - chunk_start);
chunk_start = chunk_end;

17
include/tcg/insn-start-words.h Normal file
View File

@ -0,0 +1,17 @@
/* SPDX-License-Identifier: MIT */
/*
* Define TARGET_INSN_START_WORDS
* Copyright (c) 2008 Fabrice Bellard
*/
#ifndef TARGET_INSN_START_WORDS
#include "cpu.h"
#ifndef TARGET_INSN_START_EXTRA_WORDS
# define TARGET_INSN_START_WORDS 1
#else
# define TARGET_INSN_START_WORDS (1 + TARGET_INSN_START_EXTRA_WORDS)
#endif
#endif /* TARGET_INSN_START_WORDS */

8
include/tcg/tcg-op.h
View File

@ -22,20 +22,20 @@
# error
#endif
#if TARGET_INSN_START_WORDS == 1
#ifndef TARGET_INSN_START_EXTRA_WORDS
static inline void tcg_gen_insn_start(target_ulong pc)
{
TCGOp *op = tcg_emit_op(INDEX_op_insn_start, 64 / TCG_TARGET_REG_BITS);
tcg_set_insn_start_param(op, 0, pc);
}
#elif TARGET_INSN_START_WORDS == 2
#elif TARGET_INSN_START_EXTRA_WORDS == 1
static inline void tcg_gen_insn_start(target_ulong pc, target_ulong a1)
{
TCGOp *op = tcg_emit_op(INDEX_op_insn_start, 2 * 64 / TCG_TARGET_REG_BITS);
tcg_set_insn_start_param(op, 0, pc);
tcg_set_insn_start_param(op, 1, a1);
}
#elif TARGET_INSN_START_WORDS == 3
#elif TARGET_INSN_START_EXTRA_WORDS == 2
static inline void tcg_gen_insn_start(target_ulong pc, target_ulong a1,
target_ulong a2)
{
@ -45,7 +45,7 @@ static inline void tcg_gen_insn_start(target_ulong pc, target_ulong a1,
tcg_set_insn_start_param(op, 2, a2);
}
#else
# error "Unhandled number of operands to insn_start"
#error Unhandled TARGET_INSN_START_EXTRA_WORDS value
#endif
#if TARGET_LONG_BITS == 32

6
include/tcg/tcg-opc.h
View File

@ -188,9 +188,9 @@ DEF(mulsh_i64, 1, 2, 0, IMPL64 | IMPL(TCG_TARGET_HAS_mulsh_i64))
#define DATA64_ARGS (TCG_TARGET_REG_BITS == 64 ? 1 : 2)
/* QEMU specific */
DEF(insn_start, 0, 0, DATA64_ARGS * TARGET_INSN_START_WORDS,
TCG_OPF_NOT_PRESENT)
/* There are tcg_ctx->insn_start_words here, not just one. */
DEF(insn_start, 0, 0, DATA64_ARGS, TCG_OPF_NOT_PRESENT)
DEF(exit_tb, 0, 0, 1, TCG_OPF_BB_EXIT | TCG_OPF_BB_END)
DEF(goto_tb, 0, 0, 1, TCG_OPF_BB_EXIT | TCG_OPF_BB_END)
DEF(goto_ptr, 0, 1, 0, TCG_OPF_BB_EXIT | TCG_OPF_BB_END)

9
include/tcg/tcg.h
View File

@ -173,12 +173,6 @@ typedef uint64_t TCGRegSet;
#define TCG_TARGET_HAS_v256 0
#endif
#ifndef TARGET_INSN_START_EXTRA_WORDS
# define TARGET_INSN_START_WORDS 1
#else
# define TARGET_INSN_START_WORDS (1 + TARGET_INSN_START_EXTRA_WORDS)
#endif
typedef enum TCGOpcode {
#define DEF(name, oargs, iargs, cargs, flags) INDEX_op_ ## name,
#include "tcg/tcg-opc.h"
@ -526,6 +520,7 @@ struct TCGContext {
uint8_t page_bits;
uint8_t tlb_dyn_max_bits;
#endif
uint8_t insn_start_words;
TCGRegSet reserved_regs;
intptr_t current_frame_offset;
@ -597,7 +592,7 @@ struct TCGContext {
TCGTemp *reg_to_temp[TCG_TARGET_NB_REGS];
uint16_t gen_insn_end_off[TCG_MAX_INSNS];
uint64_t gen_insn_data[TCG_MAX_INSNS][TARGET_INSN_START_WORDS];
uint64_t *gen_insn_data;
/* Exit to translator on overflow. */
sigjmp_buf jmp_trans;

2
target/i386/helper.c
View File

@ -29,7 +29,7 @@
#endif
#include "qemu/log.h"
#ifdef CONFIG_TCG
#include "tcg/tcg.h"
#include "tcg/insn-start-words.h"
#endif
void cpu_sync_avx_hflag(CPUX86State *env)

2
target/openrisc/sys_helper.c
View File

@ -26,7 +26,7 @@
#ifndef CONFIG_USER_ONLY
#include "hw/boards.h"
#endif
#include "tcg/tcg.h"
#include "tcg/insn-start-words.h"
#define TO_SPR(group, number) (((group) << 11) + (number))

16
tcg/tcg.c
View File

@ -1501,6 +1501,8 @@ void tcg_func_start(TCGContext *s)
tcg_debug_assert(s->tlb_fast_offset < 0);
tcg_debug_assert(s->tlb_fast_offset >= MIN_TLB_MASK_TABLE_OFS);
#endif
tcg_debug_assert(s->insn_start_words > 0);
}
static TCGTemp *tcg_temp_alloc(TCGContext *s)
@ -2445,7 +2447,7 @@ static void tcg_dump_ops(TCGContext *s, FILE *f, bool have_prefs)
nb_oargs = 0;
col += ne_fprintf(f, "\n ----");
for (i = 0; i < TARGET_INSN_START_WORDS; ++i) {
for (i = 0, k = s->insn_start_words; i < k; ++i) {
col += ne_fprintf(f, " %016" PRIx64,
tcg_get_insn_start_param(op, i));
}
@ -6024,7 +6026,7 @@ int tcg_gen_code(TCGContext *s, TranslationBlock *tb, uint64_t pc_start)
#ifdef CONFIG_PROFILER
TCGProfile *prof = &s->prof;
#endif
int i, num_insns;
int i, start_words, num_insns;
TCGOp *op;
#ifdef CONFIG_PROFILER
@ -6147,6 +6149,10 @@ int tcg_gen_code(TCGContext *s, TranslationBlock *tb, uint64_t pc_start)
s->pool_labels = NULL;
#endif
start_words = s->insn_start_words;
s->gen_insn_data =
tcg_malloc(sizeof(uint64_t) * s->gen_tb->icount * start_words);
num_insns = -1;
QTAILQ_FOREACH(op, &s->ops, link) {
TCGOpcode opc = op->opc;
@ -6172,8 +6178,8 @@ int tcg_gen_code(TCGContext *s, TranslationBlock *tb, uint64_t pc_start)
assert(s->gen_insn_end_off[num_insns] == off);
}
num_insns++;
for (i = 0; i < TARGET_INSN_START_WORDS; ++i) {
s->gen_insn_data[num_insns][i] =
for (i = 0; i < start_words; ++i) {
s->gen_insn_data[num_insns * start_words + i] =
tcg_get_insn_start_param(op, i);
}
break;
@ -6219,7 +6225,7 @@ int tcg_gen_code(TCGContext *s, TranslationBlock *tb, uint64_t pc_start)
return -2;
}
}
tcg_debug_assert(num_insns >= 0);
tcg_debug_assert(num_insns + 1 == s->gen_tb->icount);
s->gen_insn_end_off[num_insns] = tcg_current_code_size(s);
/* Generate TB finalization at the end of block */