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target/i386: fix translation for icount mode

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This patch fixes the checking of boundary crossing instructions.
In icount mode only first instruction of the block may cross
the page boundary to keep the translation deterministic.
These conditions already existed, but compared the wrong variable.

Backports commit 41d54dc09f1f327dedc79d5ba0b1b437ab7b0e94 from qemu
This commit is contained in:
Pavel Dovgalyuk 2018-10-04 04:32:18 -04:00 committed by Lioncash
parent 710467e034
commit 461fbaa9eb
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 3 additions and 3 deletions
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6
qemu/target/i386/translate.c
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@ -9173,10 +9173,10 @@ static void i386_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
chance to happen */
dc->base.is_jmp = DISAS_TOO_MANY;
} else if ((dc->base.tb->cflags & CF_USE_ICOUNT)
&& ((dc->base.pc_next & TARGET_PAGE_MASK)
!= ((dc->base.pc_next + TARGET_MAX_INSN_SIZE - 1)
&& ((pc_next & TARGET_PAGE_MASK)
!= ((pc_next + TARGET_MAX_INSN_SIZE - 1)
& TARGET_PAGE_MASK)
|| (dc->base.pc_next & ~TARGET_PAGE_MASK) == 0)) {
|| (pc_next & ~TARGET_PAGE_MASK) == 0)) {
/* Do not cross the boundary of the pages in icount mode,
it can cause an exception. Do it only when boundary is
crossed by the first instruction in the block.