diff options
| author | Ilya Leoshkevich <iii@linux.ibm.com> | 2021-05-19 06:57:37 +0200 |
|---|---|---|
| committer | Cornelia Huck <cohuck@redhat.com> | 2021-05-20 14:19:30 +0200 |
| commit | 9b21049edd3c352efc615e030cd8e931e0c6f910 (patch) | |
| tree | c63ae75ce402fab46749b21656196b0c098a7e1e /target/i386 | |
| parent | dcc9cf3801039741b7a574b5035db283a7fed271 (diff) | |
target/i386: Make sure that vsyscall's tb->size != 0
tb_gen_code() assumes that tb->size must never be zero, otherwise it
may produce spurious exceptions. For x86_64 this may happen when
creating a translation block for the vsyscall page.
Fix by pretending that vsyscall translation blocks have at least one
instruction.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210519045738.1335210-2-iii@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Diffstat (limited to 'target/i386')
| -rw-r--r-- | target/i386/tcg/translate.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c index db56a48343..3ab8c23855 100644 --- a/target/i386/tcg/translate.c +++ b/target/i386/tcg/translate.c @@ -8583,6 +8583,7 @@ static void i386_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu) */ if ((dc->base.pc_next & TARGET_PAGE_MASK) == TARGET_VSYSCALL_PAGE) { gen_exception(dc, EXCP_VSYSCALL, dc->base.pc_next); + dc->base.pc_next = dc->pc + 1; return; } #endif |