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Diffstat (limited to 'results/classifier/mode-deepseek-r1:32b/reasoning/user/2318')
| -rw-r--r-- | results/classifier/mode-deepseek-r1:32b/reasoning/user/2318 | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/results/classifier/mode-deepseek-r1:32b/reasoning/user/2318 b/results/classifier/mode-deepseek-r1:32b/reasoning/user/2318 new file mode 100644 index 000000000..205f60fcb --- /dev/null +++ b/results/classifier/mode-deepseek-r1:32b/reasoning/user/2318 @@ -0,0 +1,15 @@ +<think> +Okay, so I need to figure out whether this QEMU bug is related to user mode or system mode. The problem is about the SUBV instruction not emulating underflow correctly. + +First, what's SUBV? From the description, it subtracts Rm from Rn and stores the result in Rn. If there's an underflow, it sets T (which I think is a status bit). The test shows that on real hardware, after the subtraction, c becomes 1 because underflow happened. But QEMU doesn't set c correctly—it leaves it as 0. + +The user provided a C program with inline assembly using SUBV. They're using registers r8, r9, and r10. The output shows that in QEMU, the underflow isn't detected, so the T bit isn't being set or handled properly. + +Now, thinking about emulation: SUBV is an instruction that affects user-level registers (like Rn) and status flags (T). So it's part of the CPU's execution for user-mode code. If QEMU isn't handling this correctly, it's likely a problem with how the CPU core emulates the instruction in user mode. + +System-mode issues usually involve higher privileges or device interactions, but here, the issue is about an assembly instruction affecting regular registers and a status bit. That sounds like it's happening within the CPU context of the program being run, which would be user mode. + +Therefore, this bug seems to be related to how QEMU emulates the SUBV instruction in user-mode code execution. +</think> + +user \ No newline at end of file |