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authorChristian Krinitsin <mail@krinitsin.com>2025-07-07 17:18:14 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-07 17:18:14 +0000
commit61361f925d4914a6608a0076e64cc2399311ed5f (patch)
tree6f717c2ff0b11d7493e60da9757818d119cfb541 /results/classifier/qwen3:32b/reasoning/syscall/1858461
parent238ec2b7cc1557d6f34c33cc482e4d0cd3e266dd (diff)
downloademulator-bug-study-61361f925d4914a6608a0076e64cc2399311ed5f.tar.gz
emulator-bug-study-61361f925d4914a6608a0076e64cc2399311ed5f.zip
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+<think>
+Okay, let's see. The user is working with QEMU and added a new syscall (436) but is getting ENOSYS from the MIPS application. They modified the mips/cpu_loop.c by adding an entry to mips_syscall_args. The issue seems to be that the syscall number is being calculated as env->active_tc.gpr[2] - 4000, and if that number is beyond the size of mips_syscall_args, it returns ENOSYS.
+
+Wait, the user mentioned that the ARM version has its own ARM_NR_BASE, which probably adjusts the syscall numbers correctly. The MIPS code might not be accounting for the correct base value, leading to the syscall_num being out of bounds. For example, if the actual syscall number is 436, but the base is 4000 (as in ARM's case), subtracting 4000 would give a negative number, which would definitely be beyond the array size, hence ENOSYS.
+
+So the problem is that the MIPS code isn't using a base value like ARM does. The user wants to refactor MIPS's cpu_loop.c to handle syscalls similarly to ARM. The root cause is that the syscall number calculation isn't correct for MIPS, leading to the wrong index in the syscall_args array. This is a syscall handling issue because the syscall number isn't being adjusted properly, causing it to fall into the ENOSYS case.
+
+The classification options are instruction, syscall, or runtime. Since the problem is about the syscall number not being handled correctly, the category should be "syscall".
+</think>
+
+syscall
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