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tcg: code_bitmap and code_write_count are not used by user-mode emulation

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Backports commit 6fad459c91e8a1dedbb6681d3f57ede5222a225c from qemu
This commit is contained in:
Paolo Bonzini 2018-02-23 23:17:30 -05:00 committed by Lioncash
parent ffdc9d6323
commit 66faf3b5df
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 47 additions and 43 deletions
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90
qemu/translate-all.c
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@ -74,11 +74,12 @@
typedef struct PageDesc {
/* list of TBs intersecting this ram page */
TranslationBlock *first_tb;
#ifdef CONFIG_SOFTMMU
/* 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)
#else
unsigned long flags;
#endif
} PageDesc;
@ -854,11 +855,11 @@ void tb_free(struct uc_struct *uc, TranslationBlock *tb)
static inline void invalidate_page_bitmap(PageDesc *p)
{
if (p->code_bitmap) {
g_free(p->code_bitmap);
p->code_bitmap = NULL;
}
#ifdef CONFIG_SOFTMMU
g_free(p->code_bitmap);
p->code_bitmap = NULL;
p->code_write_count = 0;
#endif
}
/* Set to NULL all the 'first_tb' fields in all PageDescs. */
@ -1133,6 +1134,7 @@ static inline void set_bits(uint8_t *tab, int start, int len)
}
}
#ifdef CONFIG_SOFTMMU
static void build_page_bitmap(PageDesc *p)
{
int n, tb_start, tb_end;
@ -1161,6 +1163,7 @@ static void build_page_bitmap(PageDesc *p)
tb = tb->page_next[n];
}
}
#endif
/* add the tb in the target page and protect it if necessary */
static inline void tb_alloc_page(struct uc_struct *uc, TranslationBlock *tb,
@ -1523,7 +1526,45 @@ void tb_invalidate_phys_page_range(struct uc_struct *uc, tb_page_addr_t start, t
#endif
}
#if !defined(CONFIG_SOFTMMU)
#ifdef CONFIG_SOFTMMU
/* len must be <= 8 and start must be a multiple of len */
void tb_invalidate_phys_page_fast(struct uc_struct* uc, tb_page_addr_t start, int len)
{
PageDesc *p;
#if 0
if (1) {
qemu_log("modifying code at 0x%x size=%d EIP=%x PC=%08x\n",
cpu_single_env->mem_io_vaddr, len,
cpu_single_env->eip,
cpu_single_env->eip +
(intptr_t)cpu_single_env->segs[R_CS].base);
}
#endif
p = page_find(uc, 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);
}
if (p->code_bitmap) {
unsigned int nr;
unsigned long b;
nr = start & ~TARGET_PAGE_MASK;
b = p->code_bitmap[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG - 1));
if (b & ((1 << len) - 1)) {
goto do_invalidate;
}
} else {
do_invalidate:
tb_invalidate_phys_page_range(uc, start, start + len, 1);
}
}
#else
static void tb_invalidate_phys_page(struct uc_struct *uc, tb_page_addr_t addr,
uintptr_t pc, void *puc,
bool locked)
@ -1593,43 +1634,6 @@ static void tb_invalidate_phys_page(struct uc_struct *uc, tb_page_addr_t addr,
}
#endif
void tb_invalidate_phys_page_fast(struct uc_struct* uc, tb_page_addr_t start, int len)
{
PageDesc *p;
#if 0
if (1) {
qemu_log("modifying code at 0x%x size=%d EIP=%x PC=%08x\n",
cpu_single_env->mem_io_vaddr, len,
cpu_single_env->eip,
cpu_single_env->eip +
(intptr_t)cpu_single_env->segs[R_CS].base);
}
#endif
p = page_find(uc, 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);
}
if (p->code_bitmap) {
unsigned int nr;
unsigned long b;
nr = start & ~TARGET_PAGE_MASK;
b = p->code_bitmap[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG - 1));
if (b & ((1 << len) - 1)) {
goto do_invalidate;
}
} else {
do_invalidate:
tb_invalidate_phys_page_range(uc, start, start + len, 1);
}
}
/* find the TB 'tb' such that tb[0].tc_ptr <= tc_ptr <
tb[1].tc_ptr. Return NULL if not found */
static TranslationBlock *tb_find_pc(struct uc_struct *uc, uintptr_t tc_ptr)