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authorChristian Krinitsin <mail@krinitsin.com>2025-06-03 14:41:43 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-06-03 14:41:43 +0200
commitd760c82f4244dc47f5413c3c88b640bb1f0f2d9e (patch)
treeba963e9c548a5f19da2665005ce85946c601cd36 /results/scraper/gitlab/semantic_issues/gitlab_semantic_bextr
parent256709d2eb3fd80d768a99964be5caa61effa2a0 (diff)
downloademulator-bug-study-d760c82f4244dc47f5413c3c88b640bb1f0f2d9e.tar.gz
emulator-bug-study-d760c82f4244dc47f5413c3c88b640bb1f0f2d9e.zip
move semantic_issues dir to results
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diff --git a/results/scraper/gitlab/semantic_issues/gitlab_semantic_bextr b/results/scraper/gitlab/semantic_issues/gitlab_semantic_bextr
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+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
+
+Compile this code
+
+void main() {
+    asm("mov rax, 0x17b3693f77fb6e9");
+    asm("mov rbx, 0x8f635a775ad3b9b4");
+    asm("mov rcx, 0xb717b75da9983018");
+    asm("bextr eax, ebx, ecx");
+}
+
+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.