blob: 2aac946aa9fc532542a81a4b698645a1209f977c (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
<think>
Okay, I need to classify this bug report as either user-mode or system-mode. Let me think about what each entails.
The issue is with the QEMU emulator's implementation of a specific instruction, `xvldi`, which seems incorrect. The problem occurs when running a C++ program that uses LoongArch vector intrinsics.
Looking at the code, it's using functions like `__lasx_xvst` and `__m256i` types, which are related to vector operations. This suggests that the issue is within user-space applications, not involving any kernel or system-level components.
The problem arises in how QEMU translates this instruction for the LoongArch target. The function `vldi_get_value` in `trans_vec.c.inc` has a bug where it incorrectly computes the data value. Specifically, the line `data = (t << 24) | (t << 8);` should be `(t << (8+32)) | t << 8`.
Since this is about how user-space instructions are emulated and doesn't involve system calls, device drivers, or higher privileges, it's a user-mode issue. The bug affects the execution of user programs running under QEMU but isn't related to the operating system's kernel or hardware devices.
Therefore, I classify this as a 'user' mode-related bug.
</think>
The bug is related to how QEMU emulates the `xvldi` instruction in user-space applications. It doesn't involve system-level components like the kernel or hardware drivers.
**Answer:** user
|