diff options
Diffstat (limited to 'results/classifier/deepseek-1/reasoning/qemu-sh4./1735384')
| -rw-r--r-- | results/classifier/deepseek-1/reasoning/qemu-sh4./1735384 | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/results/classifier/deepseek-1/reasoning/qemu-sh4./1735384 b/results/classifier/deepseek-1/reasoning/qemu-sh4./1735384 new file mode 100644 index 000000000..c879498b1 --- /dev/null +++ b/results/classifier/deepseek-1/reasoning/qemu-sh4./1735384 @@ -0,0 +1,38 @@ +<think> +Okay, let's break down what I'm seeing here. So, there are a couple of emails talking about a bug in QEMU related to running Java on the sh4 architecture using qemu-sh4. The user Adrian is reporting that after some changes in QEMU, when he tried to run `java -version`, it resulted in a segmentation fault. + +First, I notice that Alex Bennée provided a patch to fix this issue. The patch modifies the file `target/sh4/translate.c`. The change involves adding a condition before freeing a TCG temporary variable. Specifically, the line was changed from: + +if (op_src < 0) { + +to + +if (op_src < 0 && !TCGV_IS_UNUSED(op_arg)) { + +This means that now, the code only frees `op_arg` if it's not unused. + +Adrian then confirms that with this fix, Java works fine again. He provided an output showing that running `java --version` no longer causes a crash but instead gives the correct version information. + +I'm thinking about why this change was necessary. It seems that in some cases, when debugging was enabled, there was a problem with TCG temps. By adding the condition to check if `op_arg` is not unused before freeing it, we avoid releasing something that might still be needed elsewhere, which was causing the segfault. + +It's also important to note that without this fix, running Java under qemu-sh4 would crash because of an issue related to TCG (Translation Coverage) in QEMU. The problem was reported as a regression after some changes, so it's crucial to ensure such regressions are fixed promptly. + +In summary, the key steps here are understanding the bug report, applying the provided patch correctly, and confirming through testing that the fix resolves the issue without introducing new problems. +</think> + +The issue described is related to running Java on the SH4 architecture using QEMU. A regression introduced a segmentation fault when executing `java -version`. The problem was identified in the translation of SH4 instructions within QEMU's codebase. + +**Solution:** +A patch was applied to modify the condition under which TCG temporary variables are freed. This ensures that only unused TCG temps are released, preventing the segfault. + +**Fix Details:** + +- **File:** `target/sh4/translate.c` +- **Change:** Modified line 2189 from `if (op_src < 0)` to `if (op_src < 0 && !TCGV_IS_UNUSED(op_arg))`. + +**Outcome:** +The fix was tested and confirmed successful, allowing Java to run without errors. The updated QEMU code now handles TCG temps correctly, avoiding the segmentation fault. + +--- + +This issue has been resolved with the applied patch, ensuring compatibility and stability when running OpenJDK JVM on qemu-sh4. \ No newline at end of file |