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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
commitdee4dcba78baf712cab403d47d9db319ab7f95d6 (patch)
tree418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/deepseek-r1:14b/reasoning/mistranslation/1850
parent4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff)
downloadqemu-analysis-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz
qemu-analysis-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip
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+<think>
+Alright, I'm looking at this bug report related to QEMU crashing when running an Aarch64 instruction called `CurrentEL`. The user provided a C program that uses assembly to read the CurrentEL value and print it. When they run it under both qemu-aarch64-static (user-mode) and qemu-system-aarch64, QEMU crashes with an illegal instruction error.
+
+First, I need to understand what `CurrentEL` does. From my knowledge, `CurrentEL` is a system register in ARM architectures that returns the current Exception Level (EL). In user space, certain registers are not accessible because they're protected by the operating system or the CPU's permissions. However, when running bare-metal code under QEMU, especially in system mode, these registers should be accessible.
+
+The bug occurs in both user-mode and full-system emulation, which suggests it's a problem with how QEMU handles this specific instruction, regardless of the mode. Since the crash is due to an illegal instruction signal (signal 4), it indicates that the code generated by QEMU when translating or executing `mrs x0, CurrentEL` is not correct.
+
+Looking at the possible categories: mistranslation refers to incorrect mapping from source architecture to IR/target. This could be happening if QEMU isn't correctly generating the right machine-code for the `CurrentEL` instruction in Aarch64. The error occurs during execution, so it's likely a translation issue rather than something else like device or network related.
+
+Other possibilities include issues with assembly lowering (assembly code generation), but since it's a specific system register access, mistranslation seems more fitting. Other categories don't seem to fit here as the problem is tied specifically to an instruction that QEMU isn't handling correctly.
+
+Therefore, the most appropriate category for this bug is 'mistranslation'.
+</think>
+
+The bug report involves QEMU crashing when executing the `CurrentEL` instruction in both user-mode and system emulation. This points to a translation issue where QEMU incorrectly handles the mapping of this instruction into machine code. 
+
+Answer: mistranslation
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