From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Subject: [PATCH] tcg/aarch64: Fix illegal insn from out-of-range shli
Date: Wed, 1 Jun 2022 18:14:59 -0700 [thread overview]
Message-ID: <20220602011459.294754-1-richard.henderson@linaro.org> (raw)
The masking in tcg_out_shl was incorrect, producing an
illegal instruction, rather than merely unspecified results
for the out-of-range shift.
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1051
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
tcg/aarch64/tcg-target.c.inc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tcg/aarch64/tcg-target.c.inc b/tcg/aarch64/tcg-target.c.inc
index 61e284bb5c..d997f7922a 100644
--- a/tcg/aarch64/tcg-target.c.inc
+++ b/tcg/aarch64/tcg-target.c.inc
@@ -1261,7 +1261,7 @@ static inline void tcg_out_shl(TCGContext *s, TCGType ext,
{
int bits = ext ? 64 : 32;
int max = bits - 1;
- tcg_out_ubfm(s, ext, rd, rn, bits - (m & max), max - (m & max));
+ tcg_out_ubfm(s, ext, rd, rn, (bits - m) & max, (max - m) & max);
}
static inline void tcg_out_shr(TCGContext *s, TCGType ext,
--
2.34.1
next reply other threads:[~2022-06-02 1:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-02 1:14 Richard Henderson [this message]
2022-06-02 1:59 ` [PATCH] tcg/aarch64: Fix illegal insn from out-of-range shli Joel Stanley
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