tcg: reorganize tb_find_physical loop
Put some comments and improve code structure. This should help reading the code. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> [Sergey Fedorov: provide commit message; bring back resetting of tb_invalidated_flag] Signed-off-by: Sergey Fedorov <sergey.fedorov@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
parent
6fad459c91
commit
1279f323d6
44
cpu-exec.c
44
cpu-exec.c
@ -223,10 +223,9 @@ static TranslationBlock *tb_find_physical(CPUState *cpu,
|
||||
uint32_t flags)
|
||||
{
|
||||
CPUArchState *env = (CPUArchState *)cpu->env_ptr;
|
||||
TranslationBlock *tb, **ptb1;
|
||||
TranslationBlock *tb, **tb_hash_head, **ptb1;
|
||||
unsigned int h;
|
||||
tb_page_addr_t phys_pc, phys_page1;
|
||||
target_ulong virt_page2;
|
||||
|
||||
tcg_ctx.tb_ctx.tb_invalidated_flag = 0;
|
||||
|
||||
@ -234,37 +233,42 @@ static TranslationBlock *tb_find_physical(CPUState *cpu,
|
||||
phys_pc = get_page_addr_code(env, pc);
|
||||
phys_page1 = phys_pc & TARGET_PAGE_MASK;
|
||||
h = tb_phys_hash_func(phys_pc);
|
||||
ptb1 = &tcg_ctx.tb_ctx.tb_phys_hash[h];
|
||||
for(;;) {
|
||||
tb = *ptb1;
|
||||
if (!tb) {
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* Start at head of the hash entry */
|
||||
ptb1 = tb_hash_head = &tcg_ctx.tb_ctx.tb_phys_hash[h];
|
||||
tb = *ptb1;
|
||||
|
||||
while (tb) {
|
||||
if (tb->pc == pc &&
|
||||
tb->page_addr[0] == phys_page1 &&
|
||||
tb->cs_base == cs_base &&
|
||||
tb->flags == flags) {
|
||||
/* check next page if needed */
|
||||
if (tb->page_addr[1] != -1) {
|
||||
tb_page_addr_t phys_page2;
|
||||
|
||||
virt_page2 = (pc & TARGET_PAGE_MASK) +
|
||||
TARGET_PAGE_SIZE;
|
||||
phys_page2 = get_page_addr_code(env, virt_page2);
|
||||
if (tb->page_addr[1] == -1) {
|
||||
/* done, we have a match */
|
||||
break;
|
||||
} else {
|
||||
/* check next page if needed */
|
||||
target_ulong virt_page2 = (pc & TARGET_PAGE_MASK) +
|
||||
TARGET_PAGE_SIZE;
|
||||
tb_page_addr_t phys_page2 = get_page_addr_code(env, virt_page2);
|
||||
|
||||
if (tb->page_addr[1] == phys_page2) {
|
||||
break;
|
||||
}
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
ptb1 = &tb->phys_hash_next;
|
||||
tb = *ptb1;
|
||||
}
|
||||
|
||||
/* Move the TB to the head of the list */
|
||||
*ptb1 = tb->phys_hash_next;
|
||||
tb->phys_hash_next = tcg_ctx.tb_ctx.tb_phys_hash[h];
|
||||
tcg_ctx.tb_ctx.tb_phys_hash[h] = tb;
|
||||
if (tb) {
|
||||
/* Move the TB to the head of the list */
|
||||
*ptb1 = tb->phys_hash_next;
|
||||
tb->phys_hash_next = *tb_hash_head;
|
||||
*tb_hash_head = tb;
|
||||
}
|
||||
return tb;
|
||||
}
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user