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[PATCH v2 1/2] target/i386: Make sure that vsyscall's tb->size != 0
From: |
Ilya Leoshkevich |
Subject: |
[PATCH v2 1/2] target/i386: Make sure that vsyscall's tb->size != 0 |
Date: |
Wed, 19 May 2021 06:57:37 +0200 |
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>
---
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 880bc45561..b5a2b981e2 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -8572,6 +8572,7 @@ 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
--
2.31.1