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The kernel sets r7 to 0 (success) or -1 (error), and stores the result in r2. When r7 is -1 and the result is positive, it needs to be negated to get the errno value that higher-level code, such as errnoFromSyscall(), expects to see. The old code was missing the check that r2 is positive, but was also doing the r7 check incorrectly; since it can only be set to 0 or -1, the blez instruction would always branch. In practice, this fix is necessary for e.g. the ENOSYS error to be interpreted correctly. This manifested as hitting an unreachable branch when calling process_vm_readv() in std.debug.MemoryAccessor. |
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| .. | ||
| bpf | ||
| arm-eabi.zig | ||
| arm64.zig | ||
| bpf.zig | ||
| io_uring_sqe.zig | ||
| ioctl.zig | ||
| IoUring.zig | ||
| loongarch64.zig | ||
| mips.zig | ||
| mips64.zig | ||
| powerpc.zig | ||
| powerpc64.zig | ||
| riscv32.zig | ||
| riscv64.zig | ||
| seccomp.zig | ||
| sparc64.zig | ||
| start_pie.zig | ||
| syscalls.zig | ||
| test.zig | ||
| thumb.zig | ||
| tls.zig | ||
| vdso.zig | ||
| x86.zig | ||
| x86_64.zig | ||