diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2024-07-16 11:30:32 +0100 |
|---|---|---|
| committer | Michael Tokarev <mjt@tls.msk.ru> | 2024-07-19 19:50:25 +0300 |
| commit | c68b380b629ca923252f8946ff0addfb4fc94925 (patch) | |
| tree | 42befc8942c8e94af2d6cab36bfe4a2691d2c352 | |
| parent | ab32beaa8e17de1731be2a7950a3da3a629ff43c (diff) | |
target/arm: Fix handling of LDAPR/STLR with negative offset
When we converted the LDAPR/STLR instructions to decodetree we
accidentally introduced a regression where the offset is negative.
The 9-bit immediate field is signed, and the old hand decoder
correctly used sextract32() to get it out of the insn word,
but the ldapr_stlr_i pattern in the decode file used "imm:9"
instead of "imm:s9", so it treated the field as unsigned.
Fix the pattern to treat the field as a signed immediate.
Cc: qemu-stable@nongnu.org
Fixes: 2521b6073b7 ("target/arm: Convert LDAPR/STLR (imm) to decodetree")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2419
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240709134504.3500007-2-peter.maydell@linaro.org
(cherry picked from commit 5669d26ec614b3f4c56cf1489b9095ed327938b1)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
| -rw-r--r-- | target/arm/tcg/a64.decode | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/target/arm/tcg/a64.decode b/target/arm/tcg/a64.decode index 8a20dce3c8..6cc29a4bce 100644 --- a/target/arm/tcg/a64.decode +++ b/target/arm/tcg/a64.decode @@ -467,7 +467,7 @@ LDAPR sz:2 111 0 00 1 0 1 11111 1100 00 rn:5 rt:5 LDRA 11 111 0 00 m:1 . 1 ......... w:1 1 rn:5 rt:5 imm=%ldra_imm &ldapr_stlr_i rn rt imm sz sign ext -@ldapr_stlr_i .. ...... .. . imm:9 .. rn:5 rt:5 &ldapr_stlr_i +@ldapr_stlr_i .. ...... .. . imm:s9 .. rn:5 rt:5 &ldapr_stlr_i STLR_i sz:2 011001 00 0 ......... 00 ..... ..... @ldapr_stlr_i sign=0 ext=0 LDAPR_i sz:2 011001 01 0 ......... 00 ..... ..... @ldapr_stlr_i sign=0 ext=0 LDAPR_i 00 011001 10 0 ......... 00 ..... ..... @ldapr_stlr_i sign=1 ext=0 sz=0 |