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Diffstat (limited to 'results/classifier/mode-deepseek-r1:32b/reasoning/user/1793')
| -rw-r--r-- | results/classifier/mode-deepseek-r1:32b/reasoning/user/1793 | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/results/classifier/mode-deepseek-r1:32b/reasoning/user/1793 b/results/classifier/mode-deepseek-r1:32b/reasoning/user/1793 new file mode 100644 index 000000000..656d2004f --- /dev/null +++ b/results/classifier/mode-deepseek-r1:32b/reasoning/user/1793 @@ -0,0 +1,23 @@ +<think> +Okay, so I need to figure out whether this bug is user-mode related or system-mode related in QEMU. Let me start by understanding the problem. + +The issue is that when running a test program under `qemu-system-riscv64`, it correctly detects the RISC-V Vector extension (RVV) using getauxval(AT_HWCAP), but when run with `qemu-riscv64`, it doesn't. The user provided code that checks for the V bit in the HWCAP. + +First, I should recall what these QEMU commands do. From what I know: + +- `qemu-system-riscv64` is used to run a full system emulation, which means it boots a kernel and runs a guest OS inside it. This is typically for testing how an OS behaves on RISC-V hardware. + +- `qemu-riscv64`, on the other hand, might be running in user-mode emulation. User-mode QEMU allows running individual programs without a full OS, translating system calls to the host's system calls. It's useful for debugging and running binaries directly. + +The problem arises because the test program is correctly detecting RVV when run under `qemu-system-riscv64` but not when run under `qemu-riscv64`. + +Now, getauxval(AT_HWCAP) retrieves hardware capabilities from the auxiliary vector. In system-mode (using qemu-system), the guest OS would set this based on the configured CPU features. Since the kernel has RVV enabled by default, it sets the V bit in HWCAP. + +In user-mode, however, QEMU is responsible for emulating the CPU and setting up the process's auxiliary vector. If `qemu-riscv64` isn't correctly setting the V bit when the target CPU supports RVV, that would cause this issue. + +So, the bug seems to be in how QEMU handles the HWCAP in user-mode versus system-mode. In user-mode, perhaps QEMU doesn't include the RVV capability even if it's supported by the host or configured in the emulation. + +Therefore, this is a user-mode related issue because it pertains to how QEMU emulates CPU features when running programs directly without a full OS. +</think> + +user \ No newline at end of file |