tcg/aarch64: Fix illegal insn from out-of-range shli

The masking in tcg_out_shl was incorrect, producing an
illegal instruction, rather than merely unspecified results
for the out-of-range shift.

Tested-by: Joel Stanley <joel@jms.id.au>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1051
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/tcg/aarch64/tcg-target.c.inc b/tcg/aarch64/tcg-target.c.inc
index 61e284b..d997f79 100644 (file)
--- 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,