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qemu-e2k/exec.c
bellard 9fa3e85353 new generic TLB support - faster self modifying code support - added ROM memory support 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@518 c046a42c-6fe2-441c-8c8c-71466251a162
2004-01-04 18:06:42 +00:00

1568 lines
43 KiB
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/*
* virtual page mapping and translated block handling
*
* Copyright (c) 2003 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <inttypes.h>
#include <sys/mman.h>
#include "config.h"
#include "cpu.h"
#include "exec-all.h"
//#define DEBUG_TB_INVALIDATE
//#define DEBUG_FLUSH
//#define DEBUG_TLB
/* make various TB consistency checks */
//#define DEBUG_TB_CHECK
/* threshold to flush the translated code buffer */
#define CODE_GEN_BUFFER_MAX_SIZE (CODE_GEN_BUFFER_SIZE - CODE_GEN_MAX_SIZE)
#define SMC_BITMAP_USE_THRESHOLD 10
#define MMAP_AREA_START 0x00000000
#define MMAP_AREA_END 0xa8000000
TranslationBlock tbs[CODE_GEN_MAX_BLOCKS];
TranslationBlock *tb_hash[CODE_GEN_HASH_SIZE];
TranslationBlock *tb_phys_hash[CODE_GEN_PHYS_HASH_SIZE];
int nb_tbs;
/* any access to the tbs or the page table must use this lock */
spinlock_t tb_lock = SPIN_LOCK_UNLOCKED;
uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE];
uint8_t *code_gen_ptr;
int phys_ram_size;
int phys_ram_fd;
uint8_t *phys_ram_base;
typedef struct PageDesc {
/* offset in memory of the page + io_index in the low 12 bits */
unsigned long phys_offset;
/* list of TBs intersecting this physical page */
TranslationBlock *first_tb;
/* in order to optimize self modifying code, we count the number
of lookups we do to a given page to use a bitmap */
unsigned int code_write_count;
uint8_t *code_bitmap;
#if defined(CONFIG_USER_ONLY)
unsigned long flags;
#endif
} PageDesc;
typedef struct VirtPageDesc {
/* physical address of code page. It is valid only if 'valid_tag'
matches 'virt_valid_tag' */
target_ulong phys_addr;
unsigned int valid_tag;
#if !defined(CONFIG_SOFTMMU)
/* original page access rights. It is valid only if 'valid_tag'
matches 'virt_valid_tag' */
unsigned int prot;
#endif
} VirtPageDesc;
#define L2_BITS 10
#define L1_BITS (32 - L2_BITS - TARGET_PAGE_BITS)
#define L1_SIZE (1 << L1_BITS)
#define L2_SIZE (1 << L2_BITS)
static void io_mem_init(void);
unsigned long real_host_page_size;
unsigned long host_page_bits;
unsigned long host_page_size;
unsigned long host_page_mask;
static PageDesc *l1_map[L1_SIZE];
#if !defined(CONFIG_USER_ONLY)
static VirtPageDesc *l1_virt_map[L1_SIZE];
static unsigned int virt_valid_tag;
#endif
/* io memory support */
CPUWriteMemoryFunc *io_mem_write[IO_MEM_NB_ENTRIES][4];
CPUReadMemoryFunc *io_mem_read[IO_MEM_NB_ENTRIES][4];
static int io_mem_nb;
/* log support */
char *logfilename = "/tmp/qemu.log";
FILE *logfile;
int loglevel;
static void page_init(void)
{
/* NOTE: we can always suppose that host_page_size >=
TARGET_PAGE_SIZE */
real_host_page_size = getpagesize();
if (host_page_size == 0)
host_page_size = real_host_page_size;
if (host_page_size < TARGET_PAGE_SIZE)
host_page_size = TARGET_PAGE_SIZE;
host_page_bits = 0;
while ((1 << host_page_bits) < host_page_size)
host_page_bits++;
host_page_mask = ~(host_page_size - 1);
#if !defined(CONFIG_USER_ONLY)
virt_valid_tag = 1;
#endif
}
static inline PageDesc *page_find_alloc(unsigned int index)
{
PageDesc **lp, *p;
lp = &l1_map[index >> L2_BITS];
p = *lp;
if (!p) {
/* allocate if not found */
p = malloc(sizeof(PageDesc) * L2_SIZE);
memset(p, 0, sizeof(PageDesc) * L2_SIZE);
*lp = p;
}
return p + (index & (L2_SIZE - 1));
}
static inline PageDesc *page_find(unsigned int index)
{
PageDesc *p;
p = l1_map[index >> L2_BITS];
if (!p)
return 0;
return p + (index & (L2_SIZE - 1));
}
#if !defined(CONFIG_USER_ONLY)
static void tlb_protect_code(CPUState *env, uint32_t addr);
static void tlb_unprotect_code(CPUState *env, uint32_t addr);
static void tlb_unprotect_code_phys(CPUState *env, uint32_t phys_addr);
static inline VirtPageDesc *virt_page_find_alloc(unsigned int index)
{
VirtPageDesc **lp, *p;
lp = &l1_virt_map[index >> L2_BITS];
p = *lp;
if (!p) {
/* allocate if not found */
p = malloc(sizeof(VirtPageDesc) * L2_SIZE);
memset(p, 0, sizeof(VirtPageDesc) * L2_SIZE);
*lp = p;
}
return p + (index & (L2_SIZE - 1));
}
static inline VirtPageDesc *virt_page_find(unsigned int index)
{
VirtPageDesc *p;
p = l1_virt_map[index >> L2_BITS];
if (!p)
return 0;
return p + (index & (L2_SIZE - 1));
}
static void virt_page_flush(void)
{
int i, j;
VirtPageDesc *p;
virt_valid_tag++;
if (virt_valid_tag == 0) {
virt_valid_tag = 1;
for(i = 0; i < L1_SIZE; i++) {
p = l1_virt_map[i];
if (p) {
for(j = 0; j < L2_SIZE; j++)
p[j].valid_tag = 0;
}
}
}
}
#else
static void virt_page_flush(void)
{
}
#endif
void cpu_exec_init(void)
{
if (!code_gen_ptr) {
code_gen_ptr = code_gen_buffer;
page_init();
io_mem_init();
}
}
static inline void invalidate_page_bitmap(PageDesc *p)
{
if (p->code_bitmap) {
free(p->code_bitmap);
p->code_bitmap = NULL;
}
p->code_write_count = 0;
}
/* set to NULL all the 'first_tb' fields in all PageDescs */
static void page_flush_tb(void)
{
int i, j;
PageDesc *p;
for(i = 0; i < L1_SIZE; i++) {
p = l1_map[i];
if (p) {
for(j = 0; j < L2_SIZE; j++) {
p->first_tb = NULL;
invalidate_page_bitmap(p);
p++;
}
}
}
}
/* flush all the translation blocks */
/* XXX: tb_flush is currently not thread safe */
void tb_flush(CPUState *env)
{
int i;
#if defined(DEBUG_FLUSH)
printf("qemu: flush code_size=%d nb_tbs=%d avg_tb_size=%d\n",
code_gen_ptr - code_gen_buffer,
nb_tbs,
nb_tbs > 0 ? (code_gen_ptr - code_gen_buffer) / nb_tbs : 0);
#endif
/* must reset current TB so that interrupts cannot modify the
links while we are modifying them */
env->current_tb = NULL;
nb_tbs = 0;
for(i = 0;i < CODE_GEN_HASH_SIZE; i++)
tb_hash[i] = NULL;
virt_page_flush();
for(i = 0;i < CODE_GEN_PHYS_HASH_SIZE; i++)
tb_phys_hash[i] = NULL;
page_flush_tb();
code_gen_ptr = code_gen_buffer;
/* XXX: flush processor icache at this point if cache flush is
expensive */
}
#ifdef DEBUG_TB_CHECK
static void tb_invalidate_check(unsigned long address)
{
TranslationBlock *tb;
int i;
address &= TARGET_PAGE_MASK;
for(i = 0;i < CODE_GEN_HASH_SIZE; i++) {
for(tb = tb_hash[i]; tb != NULL; tb = tb->hash_next) {
if (!(address + TARGET_PAGE_SIZE <= tb->pc ||
address >= tb->pc + tb->size)) {
printf("ERROR invalidate: address=%08lx PC=%08lx size=%04x\n",
address, tb->pc, tb->size);
}
}
}
}
/* verify that all the pages have correct rights for code */
static void tb_page_check(void)
{
TranslationBlock *tb;
int i, flags1, flags2;
for(i = 0;i < CODE_GEN_HASH_SIZE; i++) {
for(tb = tb_hash[i]; tb != NULL; tb = tb->hash_next) {
flags1 = page_get_flags(tb->pc);
flags2 = page_get_flags(tb->pc + tb->size - 1);
if ((flags1 & PAGE_WRITE) || (flags2 & PAGE_WRITE)) {
printf("ERROR page flags: PC=%08lx size=%04x f1=%x f2=%x\n",
tb->pc, tb->size, flags1, flags2);
}
}
}
}
void tb_jmp_check(TranslationBlock *tb)
{
TranslationBlock *tb1;
unsigned int n1;
/* suppress any remaining jumps to this TB */
tb1 = tb->jmp_first;
for(;;) {
n1 = (long)tb1 & 3;
tb1 = (TranslationBlock *)((long)tb1 & ~3);
if (n1 == 2)
break;
tb1 = tb1->jmp_next[n1];
}
/* check end of list */
if (tb1 != tb) {
printf("ERROR: jmp_list from 0x%08lx\n", (long)tb);
}
}
#endif
/* invalidate one TB */
static inline void tb_remove(TranslationBlock **ptb, TranslationBlock *tb,
int next_offset)
{
TranslationBlock *tb1;
for(;;) {
tb1 = *ptb;
if (tb1 == tb) {
*ptb = *(TranslationBlock **)((char *)tb1 + next_offset);
break;
}
ptb = (TranslationBlock **)((char *)tb1 + next_offset);
}
}
static inline void tb_page_remove(TranslationBlock **ptb, TranslationBlock *tb)
{
TranslationBlock *tb1;
unsigned int n1;
for(;;) {
tb1 = *ptb;
n1 = (long)tb1 & 3;
tb1 = (TranslationBlock *)((long)tb1 & ~3);
if (tb1 == tb) {
*ptb = tb1->page_next[n1];
break;
}
ptb = &tb1->page_next[n1];
}
}
static inline void tb_jmp_remove(TranslationBlock *tb, int n)
{
TranslationBlock *tb1, **ptb;
unsigned int n1;
ptb = &tb->jmp_next[n];
tb1 = *ptb;
if (tb1) {
/* find tb(n) in circular list */
for(;;) {
tb1 = *ptb;
n1 = (long)tb1 & 3;
tb1 = (TranslationBlock *)((long)tb1 & ~3);
if (n1 == n && tb1 == tb)
break;
if (n1 == 2) {
ptb = &tb1->jmp_first;
} else {
ptb = &tb1->jmp_next[n1];
}
}
/* now we can suppress tb(n) from the list */
*ptb = tb->jmp_next[n];
tb->jmp_next[n] = NULL;
}
}
/* reset the jump entry 'n' of a TB so that it is not chained to
another TB */
static inline void tb_reset_jump(TranslationBlock *tb, int n)
{
tb_set_jmp_target(tb, n, (unsigned long)(tb->tc_ptr + tb->tb_next_offset[n]));
}
static inline void tb_invalidate(TranslationBlock *tb)
{
unsigned int h, n1;
TranslationBlock *tb1, *tb2, **ptb;
tb_invalidated_flag = 1;
/* remove the TB from the hash list */
h = tb_hash_func(tb->pc);
ptb = &tb_hash[h];
for(;;) {
tb1 = *ptb;
/* NOTE: the TB is not necessarily linked in the hash. It
indicates that it is not currently used */
if (tb1 == NULL)
return;
if (tb1 == tb) {
*ptb = tb1->hash_next;
break;
}
ptb = &tb1->hash_next;
}
/* suppress this TB from the two jump lists */
tb_jmp_remove(tb, 0);
tb_jmp_remove(tb, 1);
/* suppress any remaining jumps to this TB */
tb1 = tb->jmp_first;
for(;;) {
n1 = (long)tb1 & 3;
if (n1 == 2)
break;
tb1 = (TranslationBlock *)((long)tb1 & ~3);
tb2 = tb1->jmp_next[n1];
tb_reset_jump(tb1, n1);
tb1->jmp_next[n1] = NULL;
tb1 = tb2;
}
tb->jmp_first = (TranslationBlock *)((long)tb | 2); /* fail safe */
}
static inline void tb_phys_invalidate(TranslationBlock *tb, unsigned int page_addr)
{
PageDesc *p;
unsigned int h;
target_ulong phys_pc;
/* remove the TB from the hash list */
phys_pc = tb->page_addr[0] + (tb->pc & ~TARGET_PAGE_MASK);
h = tb_phys_hash_func(phys_pc);
tb_remove(&tb_phys_hash[h], tb,
offsetof(TranslationBlock, phys_hash_next));
/* remove the TB from the page list */
if (tb->page_addr[0] != page_addr) {
p = page_find(tb->page_addr[0] >> TARGET_PAGE_BITS);
tb_page_remove(&p->first_tb, tb);
invalidate_page_bitmap(p);
}
if (tb->page_addr[1] != -1 && tb->page_addr[1] != page_addr) {
p = page_find(tb->page_addr[1] >> TARGET_PAGE_BITS);
tb_page_remove(&p->first_tb, tb);
invalidate_page_bitmap(p);
}
tb_invalidate(tb);
}
static inline void set_bits(uint8_t *tab, int start, int len)
{
int end, mask, end1;
end = start + len;
tab += start >> 3;
mask = 0xff << (start & 7);
if ((start & ~7) == (end & ~7)) {
if (start < end) {
mask &= ~(0xff << (end & 7));
*tab |= mask;
}
} else {
*tab++ |= mask;
start = (start + 8) & ~7;
end1 = end & ~7;
while (start < end1) {
*tab++ = 0xff;
start += 8;
}
if (start < end) {
mask = ~(0xff << (end & 7));
*tab |= mask;
}
}
}
static void build_page_bitmap(PageDesc *p)
{
int n, tb_start, tb_end;
TranslationBlock *tb;
p->code_bitmap = malloc(TARGET_PAGE_SIZE / 8);
if (!p->code_bitmap)
return;
memset(p->code_bitmap, 0, TARGET_PAGE_SIZE / 8);
tb = p->first_tb;
while (tb != NULL) {
n = (long)tb & 3;
tb = (TranslationBlock *)((long)tb & ~3);
/* NOTE: this is subtle as a TB may span two physical pages */
if (n == 0) {
/* NOTE: tb_end may be after the end of the page, but
it is not a problem */
tb_start = tb->pc & ~TARGET_PAGE_MASK;
tb_end = tb_start + tb->size;
if (tb_end > TARGET_PAGE_SIZE)
tb_end = TARGET_PAGE_SIZE;
} else {
tb_start = 0;
tb_end = ((tb->pc + tb->size) & ~TARGET_PAGE_MASK);
}
set_bits(p->code_bitmap, tb_start, tb_end - tb_start);
tb = tb->page_next[n];
}
}
/* invalidate all TBs which intersect with the target physical page
starting in range [start;end[. NOTE: start and end must refer to
the same physical page */
static void tb_invalidate_phys_page_range(target_ulong start, target_ulong end)
{
int n;
PageDesc *p;
TranslationBlock *tb, *tb_next;
target_ulong tb_start, tb_end;
p = page_find(start >> TARGET_PAGE_BITS);
if (!p)
return;
if (!p->code_bitmap &&
++p->code_write_count >= SMC_BITMAP_USE_THRESHOLD) {
/* build code bitmap */
build_page_bitmap(p);
}
/* we remove all the TBs in the range [start, end[ */
/* XXX: see if in some cases it could be faster to invalidate all the code */
tb = p->first_tb;
while (tb != NULL) {
n = (long)tb & 3;
tb = (TranslationBlock *)((long)tb & ~3);
tb_next = tb->page_next[n];
/* NOTE: this is subtle as a TB may span two physical pages */
if (n == 0) {
/* NOTE: tb_end may be after the end of the page, but
it is not a problem */
tb_start = tb->page_addr[0] + (tb->pc & ~TARGET_PAGE_MASK);
tb_end = tb_start + tb->size;
} else {
tb_start = tb->page_addr[1];
tb_end = tb_start + ((tb->pc + tb->size) & ~TARGET_PAGE_MASK);
}
if (!(tb_end <= start || tb_start >= end)) {
tb_phys_invalidate(tb, -1);
}
tb = tb_next;
}
#if !defined(CONFIG_USER_ONLY)
/* if no code remaining, no need to continue to use slow writes */
if (!p->first_tb) {
invalidate_page_bitmap(p);
tlb_unprotect_code_phys(cpu_single_env, start);
}
#endif
}
/* len must be <= 8 and start must be a multiple of len */
static inline void tb_invalidate_phys_page_fast(target_ulong start, int len)
{
PageDesc *p;
int offset, b;
p = page_find(start >> TARGET_PAGE_BITS);
if (!p)
return;
if (p->code_bitmap) {
offset = start & ~TARGET_PAGE_MASK;
b = p->code_bitmap[offset >> 3] >> (offset & 7);
if (b & ((1 << len) - 1))
goto do_invalidate;
} else {
do_invalidate:
tb_invalidate_phys_page_range(start, start + len);
}
}
/* invalidate all TBs which intersect with the target virtual page
starting in range [start;end[. This function is usually used when
the target processor flushes its I-cache. NOTE: start and end must
refer to the same physical page */
void tb_invalidate_page_range(target_ulong start, target_ulong end)
{
int n;
PageDesc *p;
TranslationBlock *tb, *tb_next;
target_ulong pc;
target_ulong phys_start;
#if !defined(CONFIG_USER_ONLY)
{
VirtPageDesc *vp;
vp = virt_page_find(start >> TARGET_PAGE_BITS);
if (!vp)
return;
if (vp->valid_tag != virt_valid_tag)
return;
phys_start = vp->phys_addr + (start & ~TARGET_PAGE_MASK);
}
#else
phys_start = start;
#endif
p = page_find(phys_start >> TARGET_PAGE_BITS);
if (!p)
return;
/* we remove all the TBs in the range [start, end[ */
/* XXX: see if in some cases it could be faster to invalidate all the code */
tb = p->first_tb;
while (tb != NULL) {
n = (long)tb & 3;
tb = (TranslationBlock *)((long)tb & ~3);
tb_next = tb->page_next[n];
pc = tb->pc;
if (!((pc + tb->size) <= start || pc >= end)) {
tb_phys_invalidate(tb, -1);
}
tb = tb_next;
}
#if !defined(CONFIG_USER_ONLY)
/* if no code remaining, no need to continue to use slow writes */
if (!p->first_tb)
tlb_unprotect_code(cpu_single_env, start);
#endif
}
#if !defined(CONFIG_SOFTMMU)
static void tb_invalidate_phys_page(target_ulong addr)
{
int n;
PageDesc *p;
TranslationBlock *tb;
addr &= TARGET_PAGE_MASK;
p = page_find(addr >> TARGET_PAGE_BITS);
if (!p)
return;
tb = p->first_tb;
while (tb != NULL) {
n = (long)tb & 3;
tb = (TranslationBlock *)((long)tb & ~3);
tb_phys_invalidate(tb, addr);
tb = tb->page_next[n];
}
p->first_tb = NULL;
}
#endif
/* add the tb in the target page and protect it if necessary */
static inline void tb_alloc_page(TranslationBlock *tb,
unsigned int n, unsigned int page_addr)
{
PageDesc *p;
TranslationBlock *last_first_tb;
tb->page_addr[n] = page_addr;
p = page_find(page_addr >> TARGET_PAGE_BITS);
tb->page_next[n] = p->first_tb;
last_first_tb = p->first_tb;
p->first_tb = (TranslationBlock *)((long)tb | n);
invalidate_page_bitmap(p);
#if defined(CONFIG_USER_ONLY)
if (p->flags & PAGE_WRITE) {
unsigned long host_start, host_end, addr;
int prot;
/* force the host page as non writable (writes will have a
page fault + mprotect overhead) */
host_start = page_addr & host_page_mask;
host_end = host_start + host_page_size;
prot = 0;
for(addr = host_start; addr < host_end; addr += TARGET_PAGE_SIZE)
prot |= page_get_flags(addr);
mprotect((void *)host_start, host_page_size,
(prot & PAGE_BITS) & ~PAGE_WRITE);
#ifdef DEBUG_TB_INVALIDATE
printf("protecting code page: 0x%08lx\n",
host_start);
#endif
p->flags &= ~PAGE_WRITE;
}
#else
/* if some code is already present, then the pages are already
protected. So we handle the case where only the first TB is
allocated in a physical page */
if (!last_first_tb) {
target_ulong virt_addr;
virt_addr = (tb->pc & TARGET_PAGE_MASK) + (n << TARGET_PAGE_BITS);
tlb_protect_code(cpu_single_env, virt_addr);
}
#endif
}
/* Allocate a new translation block. Flush the translation buffer if
too many translation blocks or too much generated code. */
TranslationBlock *tb_alloc(unsigned long pc)
{
TranslationBlock *tb;
if (nb_tbs >= CODE_GEN_MAX_BLOCKS ||
(code_gen_ptr - code_gen_buffer) >= CODE_GEN_BUFFER_MAX_SIZE)
return NULL;
tb = &tbs[nb_tbs++];
tb->pc = pc;
return tb;
}
/* add a new TB and link it to the physical page tables. phys_page2 is
(-1) to indicate that only one page contains the TB. */
void tb_link_phys(TranslationBlock *tb,
target_ulong phys_pc, target_ulong phys_page2)
{
unsigned int h;
TranslationBlock **ptb;
/* add in the physical hash table */
h = tb_phys_hash_func(phys_pc);
ptb = &tb_phys_hash[h];
tb->phys_hash_next = *ptb;
*ptb = tb;
/* add in the page list */
tb_alloc_page(tb, 0, phys_pc & TARGET_PAGE_MASK);
if (phys_page2 != -1)
tb_alloc_page(tb, 1, phys_page2);
else
tb->page_addr[1] = -1;
#ifdef DEBUG_TB_CHECK
tb_page_check();
#endif
}
/* link the tb with the other TBs */
void tb_link(TranslationBlock *tb)
{
#if !defined(CONFIG_USER_ONLY)
{
VirtPageDesc *vp;
target_ulong addr;
/* save the code memory mappings (needed to invalidate the code) */
addr = tb->pc & TARGET_PAGE_MASK;
vp = virt_page_find_alloc(addr >> TARGET_PAGE_BITS);
vp->phys_addr = tb->page_addr[0];
vp->valid_tag = virt_valid_tag;
if (tb->page_addr[1] != -1) {
addr += TARGET_PAGE_SIZE;
vp = virt_page_find_alloc(addr >> TARGET_PAGE_BITS);
vp->phys_addr = tb->page_addr[1];
vp->valid_tag = virt_valid_tag;
}
}
#endif
tb->jmp_first = (TranslationBlock *)((long)tb | 2);
tb->jmp_next[0] = NULL;
tb->jmp_next[1] = NULL;
/* init original jump addresses */
if (tb->tb_next_offset[0] != 0xffff)
tb_reset_jump(tb, 0);
if (tb->tb_next_offset[1] != 0xffff)
tb_reset_jump(tb, 1);
}
/* find the TB 'tb' such that tb[0].tc_ptr <= tc_ptr <
tb[1].tc_ptr. Return NULL if not found */
TranslationBlock *tb_find_pc(unsigned long tc_ptr)
{
int m_min, m_max, m;
unsigned long v;
TranslationBlock *tb;
if (nb_tbs <= 0)
return NULL;
if (tc_ptr < (unsigned long)code_gen_buffer ||
tc_ptr >= (unsigned long)code_gen_ptr)
return NULL;
/* binary search (cf Knuth) */
m_min = 0;
m_max = nb_tbs - 1;
while (m_min <= m_max) {
m = (m_min + m_max) >> 1;
tb = &tbs[m];
v = (unsigned long)tb->tc_ptr;
if (v == tc_ptr)
return tb;
else if (tc_ptr < v) {
m_max = m - 1;
} else {
m_min = m + 1;
}
}
return &tbs[m_max];
}
static void tb_reset_jump_recursive(TranslationBlock *tb);
static inline void tb_reset_jump_recursive2(TranslationBlock *tb, int n)
{
TranslationBlock *tb1, *tb_next, **ptb;
unsigned int n1;
tb1 = tb->jmp_next[n];
if (tb1 != NULL) {
/* find head of list */
for(;;) {
n1 = (long)tb1 & 3;
tb1 = (TranslationBlock *)((long)tb1 & ~3);
if (n1 == 2)
break;
tb1 = tb1->jmp_next[n1];
}
/* we are now sure now that tb jumps to tb1 */
tb_next = tb1;
/* remove tb from the jmp_first list */
ptb = &tb_next->jmp_first;
for(;;) {
tb1 = *ptb;
n1 = (long)tb1 & 3;
tb1 = (TranslationBlock *)((long)tb1 & ~3);
if (n1 == n && tb1 == tb)
break;
ptb = &tb1->jmp_next[n1];
}
*ptb = tb->jmp_next[n];
tb->jmp_next[n] = NULL;
/* suppress the jump to next tb in generated code */
tb_reset_jump(tb, n);
/* suppress jumps in the tb on which we could have jumped */
tb_reset_jump_recursive(tb_next);
}
}
static void tb_reset_jump_recursive(TranslationBlock *tb)
{
tb_reset_jump_recursive2(tb, 0);
tb_reset_jump_recursive2(tb, 1);
}
/* add a breakpoint. EXCP_DEBUG is returned by the CPU loop if a
breakpoint is reached */
int cpu_breakpoint_insert(CPUState *env, uint32_t pc)
{
#if defined(TARGET_I386)
int i;
for(i = 0; i < env->nb_breakpoints; i++) {
if (env->breakpoints[i] == pc)
return 0;
}
if (env->nb_breakpoints >= MAX_BREAKPOINTS)
return -1;
env->breakpoints[env->nb_breakpoints++] = pc;
tb_invalidate_page_range(pc, pc + 1);
return 0;
#else
return -1;
#endif
}
/* remove a breakpoint */
int cpu_breakpoint_remove(CPUState *env, uint32_t pc)
{
#if defined(TARGET_I386)
int i;
for(i = 0; i < env->nb_breakpoints; i++) {
if (env->breakpoints[i] == pc)
goto found;
}
return -1;
found:
memmove(&env->breakpoints[i], &env->breakpoints[i + 1],
(env->nb_breakpoints - (i + 1)) * sizeof(env->breakpoints[0]));
env->nb_breakpoints--;
tb_invalidate_page_range(pc, pc + 1);
return 0;
#else
return -1;
#endif
}
/* enable or disable single step mode. EXCP_DEBUG is returned by the
CPU loop after each instruction */
void cpu_single_step(CPUState *env, int enabled)
{
#if defined(TARGET_I386)
if (env->singlestep_enabled != enabled) {
env->singlestep_enabled = enabled;
/* must flush all the translated code to avoid inconsistancies */
/* XXX: only flush what is necessary */
tb_flush(env);
}
#endif
}
/* enable or disable low levels log */
void cpu_set_log(int log_flags)
{
loglevel = log_flags;
if (loglevel && !logfile) {
logfile = fopen(logfilename, "w");
if (!logfile) {
perror(logfilename);
_exit(1);
}
#if !defined(CONFIG_SOFTMMU)
/* must avoid mmap() usage of glibc by setting a buffer "by hand" */
{
static uint8_t logfile_buf[4096];
setvbuf(logfile, logfile_buf, _IOLBF, sizeof(logfile_buf));
}
#else
setvbuf(logfile, NULL, _IOLBF, 0);
#endif
}
}
void cpu_set_log_filename(const char *filename)
{
logfilename = strdup(filename);
}
/* mask must never be zero, except for A20 change call */
void cpu_interrupt(CPUState *env, int mask)
{
TranslationBlock *tb;
env->interrupt_request |= mask;
/* if the cpu is currently executing code, we must unlink it and
all the potentially executing TB */
tb = env->current_tb;
if (tb) {
tb_reset_jump_recursive(tb);
}
}
void cpu_abort(CPUState *env, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "qemu: fatal: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
#ifdef TARGET_I386
cpu_x86_dump_state(env, stderr, X86_DUMP_FPU | X86_DUMP_CCOP);
#endif
va_end(ap);
abort();
}
#if !defined(CONFIG_USER_ONLY)
void tlb_flush(CPUState *env)
{
int i;
#if defined(DEBUG_TLB)
printf("tlb_flush:\n");
#endif
/* must reset current TB so that interrupts cannot modify the
links while we are modifying them */
env->current_tb = NULL;
for(i = 0; i < CPU_TLB_SIZE; i++) {
env->tlb_read[0][i].address = -1;
env->tlb_write[0][i].address = -1;
env->tlb_read[1][i].address = -1;
env->tlb_write[1][i].address = -1;
}
virt_page_flush();
for(i = 0;i < CODE_GEN_HASH_SIZE; i++)
tb_hash[i] = NULL;
#if !defined(CONFIG_SOFTMMU)
munmap((void *)MMAP_AREA_START, MMAP_AREA_END - MMAP_AREA_START);
#endif
}
static inline void tlb_flush_entry(CPUTLBEntry *tlb_entry, uint32_t addr)
{
if (addr == (tlb_entry->address &
(TARGET_PAGE_MASK | TLB_INVALID_MASK)))
tlb_entry->address = -1;
}
void tlb_flush_page(CPUState *env, uint32_t addr)
{
int i, n;
VirtPageDesc *vp;
PageDesc *p;
TranslationBlock *tb;
#if defined(DEBUG_TLB)
printf("tlb_flush_page: 0x%08x\n", addr);
#endif
/* must reset current TB so that interrupts cannot modify the
links while we are modifying them */
env->current_tb = NULL;
addr &= TARGET_PAGE_MASK;
i = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
tlb_flush_entry(&env->tlb_read[0][i], addr);
tlb_flush_entry(&env->tlb_write[0][i], addr);
tlb_flush_entry(&env->tlb_read[1][i], addr);
tlb_flush_entry(&env->tlb_write[1][i], addr);
/* remove from the virtual pc hash table all the TB at this
virtual address */
vp = virt_page_find(addr >> TARGET_PAGE_BITS);
if (vp && vp->valid_tag == virt_valid_tag) {
p = page_find(vp->phys_addr >> TARGET_PAGE_BITS);
if (p) {
/* we remove all the links to the TBs in this virtual page */
tb = p->first_tb;
while (tb != NULL) {
n = (long)tb & 3;
tb = (TranslationBlock *)((long)tb & ~3);
if ((tb->pc & TARGET_PAGE_MASK) == addr ||
((tb->pc + tb->size - 1) & TARGET_PAGE_MASK) == addr) {
tb_invalidate(tb);
}
tb = tb->page_next[n];
}
}
}
#if !defined(CONFIG_SOFTMMU)
if (addr < MMAP_AREA_END)
munmap((void *)addr, TARGET_PAGE_SIZE);
#endif
}
static inline void tlb_protect_code1(CPUTLBEntry *tlb_entry, uint32_t addr)
{
if (addr == (tlb_entry->address &
(TARGET_PAGE_MASK | TLB_INVALID_MASK)) &&
(tlb_entry->address & ~TARGET_PAGE_MASK) != IO_MEM_CODE) {
tlb_entry->address |= IO_MEM_CODE;
tlb_entry->addend -= (unsigned long)phys_ram_base;
}
}
/* update the TLBs so that writes to code in the virtual page 'addr'
can be detected */
static void tlb_protect_code(CPUState *env, uint32_t addr)
{
int i;
addr &= TARGET_PAGE_MASK;
i = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
tlb_protect_code1(&env->tlb_write[0][i], addr);
tlb_protect_code1(&env->tlb_write[1][i], addr);
#if !defined(CONFIG_SOFTMMU)
/* NOTE: as we generated the code for this page, it is already at
least readable */
if (addr < MMAP_AREA_END)
mprotect((void *)addr, TARGET_PAGE_SIZE, PROT_READ);
#endif
}
static inline void tlb_unprotect_code1(CPUTLBEntry *tlb_entry, uint32_t addr)
{
if (addr == (tlb_entry->address &
(TARGET_PAGE_MASK | TLB_INVALID_MASK)) &&
(tlb_entry->address & ~TARGET_PAGE_MASK) == IO_MEM_CODE) {
tlb_entry->address &= TARGET_PAGE_MASK;
tlb_entry->addend += (unsigned long)phys_ram_base;
}
}
/* update the TLB so that writes in virtual page 'addr' are no longer
tested self modifying code */
static void tlb_unprotect_code(CPUState *env, uint32_t addr)
{
int i;
addr &= TARGET_PAGE_MASK;
i = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
tlb_unprotect_code1(&env->tlb_write[0][i], addr);
tlb_unprotect_code1(&env->tlb_write[1][i], addr);
}
static inline void tlb_unprotect_code2(CPUTLBEntry *tlb_entry,
uint32_t phys_addr)
{
if ((tlb_entry->address & ~TARGET_PAGE_MASK) == IO_MEM_CODE &&
((tlb_entry->address & TARGET_PAGE_MASK) + tlb_entry->addend) == phys_addr) {
tlb_entry->address &= TARGET_PAGE_MASK;
tlb_entry->addend += (unsigned long)phys_ram_base;
}
}
/* update the TLB so that writes in physical page 'phys_addr' are no longer
tested self modifying code */
/* XXX: find a way to improve it */
static void tlb_unprotect_code_phys(CPUState *env, uint32_t phys_addr)
{
int i;
phys_addr &= TARGET_PAGE_MASK;
for(i = 0; i < CPU_TLB_SIZE; i++)
tlb_unprotect_code2(&env->tlb_write[0][i], phys_addr);
for(i = 0; i < CPU_TLB_SIZE; i++)
tlb_unprotect_code2(&env->tlb_write[1][i], phys_addr);
}
/* add a new TLB entry. At most a single entry for a given virtual
address is permitted. */
int tlb_set_page(CPUState *env, uint32_t vaddr, uint32_t paddr, int prot,
int is_user, int is_softmmu)
{
PageDesc *p;
target_ulong pd;
TranslationBlock *first_tb;
unsigned int index;
target_ulong address, addend;
int ret;
p = page_find(paddr >> TARGET_PAGE_BITS);
if (!p) {
pd = IO_MEM_UNASSIGNED;
first_tb = NULL;
} else {
pd = p->phys_offset;
first_tb = p->first_tb;
}
#if defined(DEBUG_TLB)
printf("tlb_set_page: vaddr=0x%08x paddr=0x%08x prot=%x u=%d c=%d smmu=%d pd=0x%08x\n",
vaddr, paddr, prot, is_user, (first_tb != NULL), is_softmmu, pd);
#endif
ret = 0;
#if !defined(CONFIG_SOFTMMU)
if (is_softmmu)
#endif
{
if ((pd & ~TARGET_PAGE_MASK) > IO_MEM_ROM) {
/* IO memory case */
address = vaddr | pd;
addend = paddr;
} else {
/* standard memory */
address = vaddr;
addend = (unsigned long)phys_ram_base + (pd & TARGET_PAGE_MASK);
}
index = (vaddr >> 12) & (CPU_TLB_SIZE - 1);
addend -= vaddr;
if (prot & PROT_READ) {
env->tlb_read[is_user][index].address = address;
env->tlb_read[is_user][index].addend = addend;
} else {
env->tlb_read[is_user][index].address = -1;
env->tlb_read[is_user][index].addend = -1;
}
if (prot & PROT_WRITE) {
if ((pd & ~TARGET_PAGE_MASK) == IO_MEM_ROM) {
/* ROM: access is ignored (same as unassigned) */
env->tlb_write[is_user][index].address = vaddr | IO_MEM_ROM;
env->tlb_write[is_user][index].addend = addend - (unsigned long)phys_ram_base;
} else if (first_tb) {
/* if code is present, we use a specific memory
handler. It works only for physical memory access */
env->tlb_write[is_user][index].address = vaddr | IO_MEM_CODE;
env->tlb_write[is_user][index].addend = addend - (unsigned long)phys_ram_base;
} else {
env->tlb_write[is_user][index].address = address;
env->tlb_write[is_user][index].addend = addend;
}
} else {
env->tlb_write[is_user][index].address = -1;
env->tlb_write[is_user][index].addend = -1;
}
}
#if !defined(CONFIG_SOFTMMU)
else {
if ((pd & ~TARGET_PAGE_MASK) > IO_MEM_ROM) {
/* IO access: no mapping is done as it will be handled by the
soft MMU */
if (!(env->hflags & HF_SOFTMMU_MASK))
ret = 2;
} else {
void *map_addr;
if (prot & PROT_WRITE) {
if ((pd & ~TARGET_PAGE_MASK) == IO_MEM_ROM || first_tb) {
/* ROM: we do as if code was inside */
/* if code is present, we only map as read only and save the
original mapping */
VirtPageDesc *vp;
vp = virt_page_find_alloc(vaddr >> TARGET_PAGE_BITS);
vp->phys_addr = pd;
vp->prot = prot;
vp->valid_tag = virt_valid_tag;
prot &= ~PAGE_WRITE;
}
}
map_addr = mmap((void *)vaddr, TARGET_PAGE_SIZE, prot,
MAP_SHARED | MAP_FIXED, phys_ram_fd, (pd & TARGET_PAGE_MASK));
if (map_addr == MAP_FAILED) {
cpu_abort(env, "mmap failed when mapped physical address 0x%08x to virtual address 0x%08x\n",
paddr, vaddr);
}
}
}
#endif
return ret;
}
/* called from signal handler: invalidate the code and unprotect the
page. Return TRUE if the fault was succesfully handled. */
int page_unprotect(unsigned long addr)
{
#if !defined(CONFIG_SOFTMMU)
VirtPageDesc *vp;
#if defined(DEBUG_TLB)
printf("page_unprotect: addr=0x%08x\n", addr);
#endif
addr &= TARGET_PAGE_MASK;
vp = virt_page_find(addr >> TARGET_PAGE_BITS);
if (!vp)
return 0;
/* NOTE: in this case, validate_tag is _not_ tested as it
validates only the code TLB */
if (vp->valid_tag != virt_valid_tag)
return 0;
if (!(vp->prot & PAGE_WRITE))
return 0;
#if defined(DEBUG_TLB)
printf("page_unprotect: addr=0x%08x phys_addr=0x%08x prot=%x\n",
addr, vp->phys_addr, vp->prot);
#endif
tb_invalidate_phys_page(vp->phys_addr);
mprotect((void *)addr, TARGET_PAGE_SIZE, vp->prot);
return 1;
#else
return 0;
#endif
}
#else
void tlb_flush(CPUState *env)
{
}
void tlb_flush_page(CPUState *env, uint32_t addr)
{
}
void tlb_flush_page_write(CPUState *env, uint32_t addr)
{
}
int tlb_set_page(CPUState *env, uint32_t vaddr, uint32_t paddr, int prot,
int is_user, int is_softmmu)
{
return 0;
}
/* dump memory mappings */
void page_dump(FILE *f)
{
unsigned long start, end;
int i, j, prot, prot1;
PageDesc *p;
fprintf(f, "%-8s %-8s %-8s %s\n",
"start", "end", "size", "prot");
start = -1;
end = -1;
prot = 0;
for(i = 0; i <= L1_SIZE; i++) {
if (i < L1_SIZE)
p = l1_map[i];
else
p = NULL;
for(j = 0;j < L2_SIZE; j++) {
if (!p)
prot1 = 0;
else
prot1 = p[j].flags;
if (prot1 != prot) {
end = (i << (32 - L1_BITS)) | (j << TARGET_PAGE_BITS);
if (start != -1) {
fprintf(f, "%08lx-%08lx %08lx %c%c%c\n",
start, end, end - start,
prot & PAGE_READ ? 'r' : '-',
prot & PAGE_WRITE ? 'w' : '-',
prot & PAGE_EXEC ? 'x' : '-');
}
if (prot1 != 0)
start = end;
else
start = -1;
prot = prot1;
}
if (!p)
break;
}
}
}
int page_get_flags(unsigned long address)
{
PageDesc *p;
p = page_find(address >> TARGET_PAGE_BITS);
if (!p)
return 0;
return p->flags;
}
/* modify the flags of a page and invalidate the code if
necessary. The flag PAGE_WRITE_ORG is positionned automatically
depending on PAGE_WRITE */
void page_set_flags(unsigned long start, unsigned long end, int flags)
{
PageDesc *p;
unsigned long addr;
start = start & TARGET_PAGE_MASK;
end = TARGET_PAGE_ALIGN(end);
if (flags & PAGE_WRITE)
flags |= PAGE_WRITE_ORG;
spin_lock(&tb_lock);
for(addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
p = page_find_alloc(addr >> TARGET_PAGE_BITS);
/* if the write protection is set, then we invalidate the code
inside */
if (!(p->flags & PAGE_WRITE) &&
(flags & PAGE_WRITE) &&
p->first_tb) {
tb_invalidate_phys_page(addr);
}
p->flags = flags;
}
spin_unlock(&tb_lock);
}
/* called from signal handler: invalidate the code and unprotect the
page. Return TRUE if the fault was succesfully handled. */
int page_unprotect(unsigned long address)
{
unsigned int page_index, prot, pindex;
PageDesc *p, *p1;
unsigned long host_start, host_end, addr;
host_start = address & host_page_mask;
page_index = host_start >> TARGET_PAGE_BITS;
p1 = page_find(page_index);
if (!p1)
return 0;
host_end = host_start + host_page_size;
p = p1;
prot = 0;
for(addr = host_start;addr < host_end; addr += TARGET_PAGE_SIZE) {
prot |= p->flags;
p++;
}
/* if the page was really writable, then we change its
protection back to writable */
if (prot & PAGE_WRITE_ORG) {
pindex = (address - host_start) >> TARGET_PAGE_BITS;
if (!(p1[pindex].flags & PAGE_WRITE)) {
mprotect((void *)host_start, host_page_size,
(prot & PAGE_BITS) | PAGE_WRITE);
p1[pindex].flags |= PAGE_WRITE;
/* and since the content will be modified, we must invalidate
the corresponding translated code. */
tb_invalidate_phys_page(address);
#ifdef DEBUG_TB_CHECK
tb_invalidate_check(address);
#endif
return 1;
}
}
return 0;
}
/* call this function when system calls directly modify a memory area */
void page_unprotect_range(uint8_t *data, unsigned long data_size)
{
unsigned long start, end, addr;
start = (unsigned long)data;
end = start + data_size;
start &= TARGET_PAGE_MASK;
end = TARGET_PAGE_ALIGN(end);
for(addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
page_unprotect(addr);
}
}
#endif /* defined(CONFIG_USER_ONLY) */
/* register physical memory. 'size' must be a multiple of the target
page size. If (phys_offset & ~TARGET_PAGE_MASK) != 0, then it is an
io memory page */
void cpu_register_physical_memory(unsigned long start_addr, unsigned long size,
long phys_offset)
{
unsigned long addr, end_addr;
PageDesc *p;
end_addr = start_addr + size;
for(addr = start_addr; addr < end_addr; addr += TARGET_PAGE_SIZE) {
p = page_find_alloc(addr >> TARGET_PAGE_BITS);
p->phys_offset = phys_offset;
if ((phys_offset & ~TARGET_PAGE_MASK) <= IO_MEM_ROM)
phys_offset += TARGET_PAGE_SIZE;
}
}
static uint32_t unassigned_mem_readb(uint32_t addr)
{
return 0;
}
static void unassigned_mem_writeb(uint32_t addr, uint32_t val)
{
}
static CPUReadMemoryFunc *unassigned_mem_read[3] = {
unassigned_mem_readb,
unassigned_mem_readb,
unassigned_mem_readb,
};
static CPUWriteMemoryFunc *unassigned_mem_write[3] = {
unassigned_mem_writeb,
unassigned_mem_writeb,
unassigned_mem_writeb,
};
/* self modifying code support in soft mmu mode : writing to a page
containing code comes to these functions */
static void code_mem_writeb(uint32_t addr, uint32_t val)
{
#if !defined(CONFIG_USER_ONLY)
tb_invalidate_phys_page_fast(addr, 1);
#endif
stb_raw(phys_ram_base + addr, val);
}
static void code_mem_writew(uint32_t addr, uint32_t val)
{
#if !defined(CONFIG_USER_ONLY)
tb_invalidate_phys_page_fast(addr, 2);
#endif
stw_raw(phys_ram_base + addr, val);
}
static void code_mem_writel(uint32_t addr, uint32_t val)
{
#if !defined(CONFIG_USER_ONLY)
tb_invalidate_phys_page_fast(addr, 4);
#endif
stl_raw(phys_ram_base + addr, val);
}
static CPUReadMemoryFunc *code_mem_read[3] = {
NULL, /* never used */
NULL, /* never used */
NULL, /* never used */
};
static CPUWriteMemoryFunc *code_mem_write[3] = {
code_mem_writeb,
code_mem_writew,
code_mem_writel,
};
static void io_mem_init(void)
{
cpu_register_io_memory(IO_MEM_ROM >> IO_MEM_SHIFT, code_mem_read, unassigned_mem_write);
cpu_register_io_memory(IO_MEM_UNASSIGNED >> IO_MEM_SHIFT, unassigned_mem_read, unassigned_mem_write);
cpu_register_io_memory(IO_MEM_CODE >> IO_MEM_SHIFT, code_mem_read, code_mem_write);
io_mem_nb = 4;
}
/* mem_read and mem_write are arrays of functions containing the
function to access byte (index 0), word (index 1) and dword (index
2). All functions must be supplied. If io_index is non zero, the
corresponding io zone is modified. If it is zero, a new io zone is
allocated. The return value can be used with
cpu_register_physical_memory(). (-1) is returned if error. */
int cpu_register_io_memory(int io_index,
CPUReadMemoryFunc **mem_read,
CPUWriteMemoryFunc **mem_write)
{
int i;
if (io_index <= 0) {
if (io_index >= IO_MEM_NB_ENTRIES)
return -1;
io_index = io_mem_nb++;
} else {
if (io_index >= IO_MEM_NB_ENTRIES)
return -1;
}
for(i = 0;i < 3; i++) {
io_mem_read[io_index][i] = mem_read[i];
io_mem_write[io_index][i] = mem_write[i];
}
return io_index << IO_MEM_SHIFT;
}
#if !defined(CONFIG_USER_ONLY)
#define MMUSUFFIX _cmmu
#define GETPC() NULL
#define env cpu_single_env
#define SHIFT 0
#include "softmmu_template.h"
#define SHIFT 1
#include "softmmu_template.h"
#define SHIFT 2
#include "softmmu_template.h"
#define SHIFT 3
#include "softmmu_template.h"
#undef env
#endif
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