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std.Thread: Explain apparently pointless mips instruction in freeAndExit().

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https://git.musl-libc.org/cgit/musl/commit/?id=ce3688eca920aa77549323f84e21f33522397115
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Alex Rønne Petersen 2024-08-12 04:10:27 +02:00 committed by Andrew Kelley
parent f988cea825
commit 6d23850108
1 changed files with 4 additions and 0 deletions
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lib/std/Thread.zig
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@ -1130,6 +1130,10 @@ const LinuxThreadImpl = struct {
[len] "r" (self.mapped.len),
: "memory"
),
// We set `sp` to the address of the current function as a workaround for a Linux
// kernel bug that caused syscalls to return EFAULT if the stack pointer is invalid.
// The bug was introduced in 46e12c07b3b9603c60fc1d421ff18618241cb081 and fixed in
// 7928eb0370d1133d0d8cd2f5ddfca19c309079d5.
.mips, .mipsel => asm volatile (
\\ move $sp, $25
\\ li $2, 4091 # SYS_munmap