From 9b21049edd3c352efc615e030cd8e931e0c6f910 Mon Sep 17 00:00:00 2001 From: Ilya Leoshkevich Date: Wed, 19 May 2021 06:57:37 +0200 Subject: [PATCH] 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 Reviewed-by: Richard Henderson Message-Id: <20210519045738.1335210-2-iii@linux.ibm.com> Signed-off-by: Cornelia Huck --- target/i386/tcg/translate.c | 1 + 1 file changed, 1 insertion(+) 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