diff options
| author | Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> | 2014-11-26 13:39:42 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-12-15 12:21:02 +0100 |
| commit | 5b9efc39aee90bbd343793e942bf8f582a0c9e4f (patch) | |
| tree | d16faa3d215c4c544d43cd30df5d8d140b44f15b /target-i386/translate.c | |
| parent | bf2a7ddb0a066c27ed1432b918baa046b6b7dfc5 (diff) | |
i386: do not cross the pages boundaries in replay mode
This patch denies crossing the boundary of the pages in the replay mode,
because it can cause an exception. Do it only when boundary is
crossed by the first instruction in the block.
If current instruction already crossed the bound - it's ok,
because an exception hasn't stopped this code.
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'target-i386/translate.c')
| -rw-r--r-- | target-i386/translate.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/target-i386/translate.c b/target-i386/translate.c index 782f7d2666..31a9f74467 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -8022,6 +8022,20 @@ static inline void gen_intermediate_code_internal(X86CPU *cpu, gen_eob(dc); break; } + /* 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. + If current instruction already crossed the bound - it's ok, + because an exception hasn't stopped this code. + */ + if (use_icount + && ((pc_ptr & TARGET_PAGE_MASK) + != ((pc_ptr + TARGET_MAX_INSN_SIZE - 1) & TARGET_PAGE_MASK) + || (pc_ptr & ~TARGET_PAGE_MASK) == 0)) { + gen_jmp_im(pc_ptr - dc->cs_base); + gen_eob(dc); + break; + } /* if too long translation, stop generation too */ if (tcg_ctx.gen_opc_ptr >= gen_opc_end || (pc_ptr - pc_start) >= (TARGET_PAGE_SIZE - 32) || |