From 256709d2eb3fd80d768a99964be5caa61effa2a0 Mon Sep 17 00:00:00 2001 From: Christian Krinitsin Date: Tue, 3 Jun 2025 12:04:13 +0000 Subject: add new classifier result --- .../002/semantic/gitlab_semantic_addsubps | 29 ++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 results/classifier/002/semantic/gitlab_semantic_addsubps (limited to 'results/classifier/002/semantic/gitlab_semantic_addsubps') diff --git a/results/classifier/002/semantic/gitlab_semantic_addsubps b/results/classifier/002/semantic/gitlab_semantic_addsubps new file mode 100644 index 000000000..4334dc949 --- /dev/null +++ b/results/classifier/002/semantic/gitlab_semantic_addsubps @@ -0,0 +1,29 @@ +semantic: 0.974 +instruction: 0.931 +other: 0.732 +boot: 0.465 +mistranslation: 0.299 + +x86 SSE/SSE2/SSE3 instruction semantic bugs with NaN + +Description of problem +The result of SSE/SSE2/SSE3 instructions with NaN is different from the CPU. From Intel manual Volume 1 Appendix D.4.2.2, they defined the behavior of such instructions with NaN. But I think QEMU did not implement this semantic exactly because the byte result is different. + +Steps to reproduce + +Compile this code + +void main() { + asm("mov rax, 0x000000007fffffff; push rax; mov rax, 0x00000000ffffffff; push rax; movdqu XMM1, [rsp];"); + asm("mov rax, 0x2e711de7aa46af1a; push rax; mov rax, 0x7fffffff7fffffff; push rax; movdqu XMM2, [rsp];"); + asm("addsubps xmm1, xmm2"); +} + +Execute and compare the result with the CPU. This problem happens with other SSE/SSE2/SSE3 instructions specified in the manual, Volume 1 Appendix D.4.2.2. + +CPU xmm1[3] = 0xffffffff + +QEMU xmm1[3] = 0x7fffffff + +Additional information +This bug is discovered by research conducted by KAIST SoftSec. -- cgit 1.4.1