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exec.c
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exec.c
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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 "config.h"
#ifdef _WIN32
#include <windows.h>
#else
#include <sys/types.h>
#include <sys/mman.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <inttypes.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
//#define DEBUG_TLB_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] __attribute__((aligned (32)));
uint8_t *code_gen_ptr;
int phys_ram_size;
int phys_ram_fd;
uint8_t *phys_ram_base;
uint8_t *phys_ram_dirty;
typedef struct PageDesc {
/* list of TBs intersecting this ram 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 PhysPageDesc {
/* offset in host memory of the page + io_index in the low 12 bits */
uint32_t phys_offset;
} PhysPageDesc;
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 qemu_real_host_page_size;
unsigned long qemu_host_page_bits;
unsigned long qemu_host_page_size;
unsigned long qemu_host_page_mask;
/* XXX: for system emulation, it could just be an array */
static PageDesc *l1_map[L1_SIZE];
PhysPageDesc **l1_phys_map;
#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];
void *io_mem_opaque[IO_MEM_NB_ENTRIES];
static int io_mem_nb;
/* log support */
char *logfilename = "/tmp/qemu.log";
FILE *logfile;
int loglevel;
/* statistics */
static int tlb_flush_count;
static int tb_flush_count;
static int tb_phys_invalidate_count;
static void page_init(void)
{
/* NOTE: we can always suppose that qemu_host_page_size >=
TARGET_PAGE_SIZE */
#ifdef _WIN32
{
SYSTEM_INFO system_info;
DWORD old_protect;
GetSystemInfo(&system_info);
qemu_real_host_page_size = system_info.dwPageSize;
VirtualProtect(code_gen_buffer, sizeof(code_gen_buffer),
PAGE_EXECUTE_READWRITE, &old_protect);
}
#else
qemu_real_host_page_size = getpagesize();
{
unsigned long start, end;
start = (unsigned long)code_gen_buffer;
start &= ~(qemu_real_host_page_size - 1);
end = (unsigned long)code_gen_buffer + sizeof(code_gen_buffer);
end += qemu_real_host_page_size - 1;
end &= ~(qemu_real_host_page_size - 1);
mprotect((void *)start, end - start,
PROT_READ | PROT_WRITE | PROT_EXEC);
}
#endif
if (qemu_host_page_size == 0)
qemu_host_page_size = qemu_real_host_page_size;
if (qemu_host_page_size < TARGET_PAGE_SIZE)
qemu_host_page_size = TARGET_PAGE_SIZE;
qemu_host_page_bits = 0;
while ((1 << qemu_host_page_bits) < qemu_host_page_size)
qemu_host_page_bits++;
qemu_host_page_mask = ~(qemu_host_page_size - 1);
#if !defined(CONFIG_USER_ONLY)
virt_valid_tag = 1;
#endif
l1_phys_map = qemu_vmalloc(L1_SIZE * sizeof(PhysPageDesc *));
memset(l1_phys_map, 0, L1_SIZE * sizeof(PhysPageDesc *));
}
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 = qemu_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));
}
static inline PhysPageDesc *phys_page_find_alloc(unsigned int index)
{
PhysPageDesc **lp, *p;
lp = &l1_phys_map[index >> L2_BITS];
p = *lp;
if (!p) {
/* allocate if not found */
p = qemu_vmalloc(sizeof(PhysPageDesc) * L2_SIZE);
memset(p, 0, sizeof(PhysPageDesc) * L2_SIZE);
*lp = p;
}
return p + (index & (L2_SIZE - 1));
}
static inline PhysPageDesc *phys_page_find(unsigned int index)
{
PhysPageDesc *p;
p = l1_phys_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, target_ulong addr);
static void tlb_unprotect_code_phys(CPUState *env, unsigned long phys_addr, target_ulong vaddr);
static inline VirtPageDesc *virt_page_find_alloc(unsigned int index)
{
VirtPageDesc **lp, *p;
/* XXX: should not truncate for 64 bit addresses */
#if TARGET_LONG_BITS > 32
index &= (L1_SIZE - 1);
#endif
lp = &l1_virt_map[index >> L2_BITS];
p = *lp;
if (!p) {
/* allocate if not found */
p = qemu_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) {
qemu_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)
{
#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
nb_tbs = 0;
memset (tb_hash, 0, CODE_GEN_HASH_SIZE * sizeof (void *));
virt_page_flush();
memset (tb_phys_hash, 0, CODE_GEN_PHYS_HASH_SIZE * sizeof (void *));
page_flush_tb();
code_gen_ptr = code_gen_buffer;
/* XXX: flush processor icache at this point if cache flush is
expensive */
tb_flush_count++;
}
#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);
tb_phys_invalidate_count++;
}
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 = qemu_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];
}
}
#ifdef TARGET_HAS_PRECISE_SMC
static void tb_gen_code(CPUState *env,
target_ulong pc, target_ulong cs_base, int flags,
int cflags)
{
TranslationBlock *tb;
uint8_t *tc_ptr;
target_ulong phys_pc, phys_page2, virt_page2;
int code_gen_size;
phys_pc = get_phys_addr_code(env, pc);
tb = tb_alloc(pc);
if (!tb) {
/* flush must be done */
tb_flush(env);
/* cannot fail at this point */
tb = tb_alloc(pc);
}
tc_ptr = code_gen_ptr;
tb->tc_ptr = tc_ptr;
tb->cs_base = cs_base;
tb->flags = flags;
tb->cflags = cflags;
cpu_gen_code(env, tb, CODE_GEN_MAX_SIZE, &code_gen_size);
code_gen_ptr = (void *)(((unsigned long)code_gen_ptr + code_gen_size + CODE_GEN_ALIGN - 1) & ~(CODE_GEN_ALIGN - 1));
/* check next page if needed */
virt_page2 = (pc + tb->size - 1) & TARGET_PAGE_MASK;
phys_page2 = -1;
if ((pc & TARGET_PAGE_MASK) != virt_page2) {
phys_page2 = get_phys_addr_code(env, virt_page2);
}
tb_link_phys(tb, phys_pc, phys_page2);
}
#endif
/* 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. 'is_cpu_write_access' should be true if called
from a real cpu write access: the virtual CPU will exit the current
TB if code is modified inside this TB. */
void tb_invalidate_phys_page_range(target_ulong start, target_ulong end,
int is_cpu_write_access)
{
int n, current_tb_modified, current_tb_not_found, current_flags;
CPUState *env = cpu_single_env;
PageDesc *p;
TranslationBlock *tb, *tb_next, *current_tb, *saved_tb;
target_ulong tb_start, tb_end;
target_ulong current_pc, current_cs_base;
p = page_find(start >> TARGET_PAGE_BITS);
if (!p)
return;
if (!p->code_bitmap &&
++p->code_write_count >= SMC_BITMAP_USE_THRESHOLD &&
is_cpu_write_access) {
/* 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 */
current_tb_not_found = is_cpu_write_access;
current_tb_modified = 0;
current_tb = NULL; /* avoid warning */
current_pc = 0; /* avoid warning */
current_cs_base = 0; /* avoid warning */
current_flags = 0; /* avoid warning */
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)) {
#ifdef TARGET_HAS_PRECISE_SMC
if (current_tb_not_found) {
current_tb_not_found = 0;
current_tb = NULL;
if (env->mem_write_pc) {
/* now we have a real cpu fault */
current_tb = tb_find_pc(env->mem_write_pc);
}
}
if (current_tb == tb &&
!(current_tb->cflags & CF_SINGLE_INSN)) {
/* If we are modifying the current TB, we must stop
its execution. We could be more precise by checking
that the modification is after the current PC, but it
would require a specialized function to partially
restore the CPU state */
current_tb_modified = 1;
cpu_restore_state(current_tb, env,
env->mem_write_pc, NULL);
#if defined(TARGET_I386)
current_flags = env->hflags;
current_flags |= (env->eflags & (IOPL_MASK | TF_MASK | VM_MASK));
current_cs_base = (target_ulong)env->segs[R_CS].base;
current_pc = current_cs_base + env->eip;
#else
#error unsupported CPU
#endif
}
#endif /* TARGET_HAS_PRECISE_SMC */
saved_tb = env->current_tb;
env->current_tb = NULL;
tb_phys_invalidate(tb, -1);
env->current_tb = saved_tb;
if (env->interrupt_request && env->current_tb)
cpu_interrupt(env, env->interrupt_request);
}
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);
if (is_cpu_write_access) {
tlb_unprotect_code_phys(env, start, env->mem_write_vaddr);
}
}
#endif
#ifdef TARGET_HAS_PRECISE_SMC
if (current_tb_modified) {
/* we generate a block containing just the instruction
modifying the memory. It will ensure that it cannot modify
itself */
env->current_tb = NULL;
tb_gen_code(env, current_pc, current_cs_base, current_flags,
CF_SINGLE_INSN);
cpu_resume_from_signal(env, NULL);
}
#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;
#if 0
if (1) {
if (loglevel) {
fprintf(logfile, "modifying code at 0x%x size=%d EIP=%x PC=%08x\n",
cpu_single_env->mem_write_vaddr, len,
cpu_single_env->eip,
cpu_single_env->eip + (long)cpu_single_env->segs[R_CS].base);
}
}
#endif
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, 1);
}
}
#if !defined(CONFIG_SOFTMMU)
static void tb_invalidate_phys_page(target_ulong addr,
unsigned long pc, void *puc)
{
int n, current_flags, current_tb_modified;
target_ulong current_pc, current_cs_base;
PageDesc *p;
TranslationBlock *tb, *current_tb;
#ifdef TARGET_HAS_PRECISE_SMC
CPUState *env = cpu_single_env;
#endif
addr &= TARGET_PAGE_MASK;
p = page_find(addr >> TARGET_PAGE_BITS);
if (!p)
return;
tb = p->first_tb;
current_tb_modified = 0;
current_tb = NULL;
current_pc = 0; /* avoid warning */
current_cs_base = 0; /* avoid warning */
current_flags = 0; /* avoid warning */
#ifdef TARGET_HAS_PRECISE_SMC
if (tb && pc != 0) {
current_tb = tb_find_pc(pc);
}
#endif
while (tb != NULL) {
n = (long)tb & 3;
tb = (TranslationBlock *)((long)tb & ~3);
#ifdef TARGET_HAS_PRECISE_SMC
if (current_tb == tb &&
!(current_tb->cflags & CF_SINGLE_INSN)) {
/* If we are modifying the current TB, we must stop
its execution. We could be more precise by checking
that the modification is after the current PC, but it
would require a specialized function to partially
restore the CPU state */
current_tb_modified = 1;
cpu_restore_state(current_tb, env, pc, puc);
#if defined(TARGET_I386)
current_flags = env->hflags;
current_flags |= (env->eflags & (IOPL_MASK | TF_MASK | VM_MASK));
current_cs_base = (target_ulong)env->segs[R_CS].base;
current_pc = current_cs_base + env->eip;
#else
#error unsupported CPU
#endif
}
#endif /* TARGET_HAS_PRECISE_SMC */
tb_phys_invalidate(tb, addr);
tb = tb->page_next[n];
}
p->first_tb = NULL;
#ifdef TARGET_HAS_PRECISE_SMC
if (current_tb_modified) {
/* we generate a block containing just the instruction
modifying the memory. It will ensure that it cannot modify
itself */
env->current_tb = NULL;
tb_gen_code(env, current_pc, current_cs_base, current_flags,
CF_SINGLE_INSN);
cpu_resume_from_signal(env, puc);
}
#endif
}
#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(TARGET_HAS_SMC) || 1
#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 & qemu_host_page_mask;
host_end = host_start + qemu_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, qemu_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
#endif /* TARGET_HAS_SMC */
}
/* Allocate a new translation block. Flush the translation buffer if
too many translation blocks or too much generated code. */
TranslationBlock *tb_alloc(target_ulong 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;
tb->cflags = 0;
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);
#ifdef DEBUG_TLB_CHECK
if (vp->valid_tag == virt_valid_tag &&
vp->phys_addr != tb->page_addr[0]) {
printf("Error tb addr=0x%x phys=0x%x vp->phys_addr=0x%x\n",
addr, tb->page_addr[0], vp->phys_addr);
}
#endif
vp->phys_addr = tb->page_addr[0];
if (vp->valid_tag != virt_valid_tag) {
vp->valid_tag = virt_valid_tag;
#if !defined(CONFIG_SOFTMMU)
vp->prot = 0;
#endif
}
if (tb->page_addr[1] != -1) {
addr += TARGET_PAGE_SIZE;
vp = virt_page_find_alloc(addr >> TARGET_PAGE_BITS);
#ifdef DEBUG_TLB_CHECK
if (vp->valid_tag == virt_valid_tag &&
vp->phys_addr != tb->page_addr[1]) {
printf("Error tb addr=0x%x phys=0x%x vp->phys_addr=0x%x\n",
addr, tb->page_addr[1], vp->phys_addr);
}
#endif
vp->phys_addr = tb->page_addr[1];
if (vp->valid_tag != virt_valid_tag) {
vp->valid_tag = virt_valid_tag;
#if !defined(CONFIG_SOFTMMU)
vp->prot = 0;
#endif
}
}
}
#endif
tb->jmp_first = (TranslationBlock *)((long)tb | 2);
tb->jmp_next[0] = NULL;
tb->jmp_next[1] = NULL;
#ifdef USE_CODE_COPY
tb->cflags &= ~CF_FP_USED;
if (tb->cflags & CF_TB_FP_USED)
tb->cflags |= CF_FP_USED;
#endif
/* 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);
}