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tb_gen_code(): only check to link next page if tb->size > 0 (so we skip empty block)

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Nguyen Anh Quynh 2015-09-20 00:05:17 +07:00
parent 7ab8d667fd
commit 9aa04d9496
1 changed files with 6 additions and 5 deletions
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11
qemu/translate-all.c
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@ -1073,7 +1073,6 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
TCGContext *tcg_ctx = env->uc->tcg_ctx;
TranslationBlock *tb;
tb_page_addr_t phys_pc, phys_page2;
target_ulong virt_page2;
int code_gen_size;
phys_pc = get_page_addr_code(env, pc);
@ -1094,11 +1093,13 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
tcg_ctx->code_gen_ptr = (void *)(((uintptr_t)tcg_ctx->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_page_addr_code(env, virt_page2);
/* check next page if needed */
if (tb->size) {
target_ulong virt_page2 = (pc + tb->size - 1) & TARGET_PAGE_MASK;
if ((pc & TARGET_PAGE_MASK) != virt_page2) {
phys_page2 = get_page_addr_code(env, virt_page2);
}
}
tb_link_page(cpu->uc, tb, phys_pc, phys_page2);
return tb;