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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>
This commit is contained in:
Ilya Leoshkevich 2021-05-19 06:57:37 +02:00 committed by Cornelia Huck
parent dcc9cf3801
commit 9b21049edd
1 changed files with 1 additions and 0 deletions
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target/i386/tcg/translate.c
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@ -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