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std.os.linux: fix some issues in x32 inline asm

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ref https://github.com/ziglang/zig/issues/22189
This commit is contained in:
Alex Rønne Petersen 2025-10-18 02:21:59 +02:00
parent f3eacec226
commit 842de66db8
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1 changed files with 17 additions and 19 deletions
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36
lib/std/os/linux/x32.zig
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@ -1,5 +1,3 @@
// TODO: A lot of this file is very likely wrong.
const builtin = @import("builtin");
const std = @import("../../std.zig");
const SYS = std.os.linux.SYS;
@ -84,20 +82,20 @@ pub fn syscall6(
pub fn clone() callconv(.naked) u32 {
asm volatile (
\\ movl $56,%%eax // SYS_clone
\\ movq %%rdi,%%r11
\\ movq %%rdx,%%rdi
\\ movq %%r8,%%rdx
\\ movq %%r9,%%r8
\\ movq 8(%%rsp),%%r10
\\ movq %%r11,%%r9
\\ andq $-16,%%rsi
\\ subq $8,%%rsi
\\ movq %%rcx,(%%rsi)
\\ movl $0x40000038,%%eax // SYS_clone
\\ mov %%rdi,%%r11
\\ mov %%rdx,%%rdi
\\ mov %%r8,%%rdx
\\ mov %%r9,%%r8
\\ mov 8(%%rsp),%%r10
\\ mov %%r11,%%r9
\\ and $-16,%%rsi
\\ sub $8,%%rsi
\\ mov %%rcx,(%%rsi)
\\ syscall
\\ testq %%rax,%%rax
\\ test %%eax,%%eax
\\ jz 1f
\\ retq
\\ ret
\\
\\1:
);
@ -105,12 +103,12 @@ pub fn clone() callconv(.naked) u32 {
\\ .cfi_undefined %%rip
);
asm volatile (
\\ xorl %%ebp,%%ebp
\\ xor %%ebp,%%ebp
\\
\\ popq %%rdi
\\ callq *%%r9
\\ movl %%eax,%%edi
\\ movl $60,%%eax // SYS_exit
\\ pop %%rdi
\\ call *%%r9
\\ mov %%eax,%%edi
\\ movl $0x4000003c,%%eax // SYS_exit
\\ syscall
\\
);