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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-05-30 16:52:07 +0200 |
|---|---|---|
| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-05-30 16:52:17 +0200 |
| commit | 9260319e7411ff8281700a532caa436f40120ec4 (patch) | |
| tree | 2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues_text/target_i386/host_missing/accel_TCG/1372 | |
| parent | 225caa38269323af1bfc2daadff5ec8bd930747f (diff) | |
| download | qemu-analysis-9260319e7411ff8281700a532caa436f40120ec4.tar.gz qemu-analysis-9260319e7411ff8281700a532caa436f40120ec4.zip | |
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Diffstat (limited to 'gitlab/issues_text/target_i386/host_missing/accel_TCG/1372')
| -rw-r--r-- | gitlab/issues_text/target_i386/host_missing/accel_TCG/1372 | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/gitlab/issues_text/target_i386/host_missing/accel_TCG/1372 b/gitlab/issues_text/target_i386/host_missing/accel_TCG/1372 new file mode 100644 index 000000000..c0a7f3da2 --- /dev/null +++ b/gitlab/issues_text/target_i386/host_missing/accel_TCG/1372 @@ -0,0 +1,20 @@ +x86 BEXTR semantic bug +Description of problem: +The result of instruction BEXTR is different with from the CPU. The value of destination register is different. I think QEMU does not consider the operand size limit. +Steps to reproduce: +1. Compile this code +``` +void main() { + asm("mov rax, 0x17b3693f77fb6e9"); + asm("mov rbx, 0x8f635a775ad3b9b4"); + asm("mov rcx, 0xb717b75da9983018"); + asm("bextr eax, ebx, ecx"); +} +``` +2. Execute and compare the result with the CPU. + - CPU + - RAX = 0x5a + - QEMU + - RAX = 0x635a775a +Additional information: +This bug is discovered by research conducted by KAIST SoftSec. |