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std.os.linux: fix some issues in mipsn32 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 02:09:04 +02:00
parent b8d776928a
commit f3eacec226
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1 changed files with 16 additions and 18 deletions
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34
lib/std/os/linux/mipsn32.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;
@ -9,7 +7,7 @@ pub fn syscall0(number: SYS) u32 {
\\ syscall
\\ beq $a3, $zero, 1f
\\ blez $v0, 1f
\\ dsubu $v0, $zero, $v0
\\ subu $v0, $zero, $v0
\\1:
: [ret] "={$2}" (-> u32),
: [number] "{$2}" (@intFromEnum(number)),
@ -21,7 +19,7 @@ pub fn syscall_pipe(fd: *[2]i32) u32 {
\\ syscall
\\ beq $a3, $zero, 1f
\\ blez $v0, 2f
\\ dsubu $v0, $zero, $v0
\\ subu $v0, $zero, $v0
\\ b 2f
\\1:
\\ sw $v0, 0($a0)
@ -38,7 +36,7 @@ pub fn syscall1(number: SYS, arg1: u32) u32 {
\\ syscall
\\ beq $a3, $zero, 1f
\\ blez $v0, 1f
\\ dsubu $v0, $zero, $v0
\\ subu $v0, $zero, $v0
\\1:
: [ret] "={$2}" (-> u32),
: [number] "{$2}" (@intFromEnum(number)),
@ -51,7 +49,7 @@ pub fn syscall2(number: SYS, arg1: u32, arg2: u32) u32 {
\\ syscall
\\ beq $a3, $zero, 1f
\\ blez $v0, 1f
\\ dsubu $v0, $zero, $v0
\\ subu $v0, $zero, $v0
\\1:
: [ret] "={$2}" (-> u32),
: [number] "{$2}" (@intFromEnum(number)),
@ -65,7 +63,7 @@ pub fn syscall3(number: SYS, arg1: u32, arg2: u32, arg3: u32) u32 {
\\ syscall
\\ beq $a3, $zero, 1f
\\ blez $v0, 1f
\\ dsubu $v0, $zero, $v0
\\ subu $v0, $zero, $v0
\\1:
: [ret] "={$2}" (-> u32),
: [number] "{$2}" (@intFromEnum(number)),
@ -80,7 +78,7 @@ pub fn syscall4(number: SYS, arg1: u32, arg2: u32, arg3: u32, arg4: u32) u32 {
\\ syscall
\\ beq $a3, $zero, 1f
\\ blez $v0, 1f
\\ dsubu $v0, $zero, $v0
\\ subu $v0, $zero, $v0
\\1:
: [ret] "={$2}" (-> u32),
: [number] "{$2}" (@intFromEnum(number)),
@ -96,7 +94,7 @@ pub fn syscall5(number: SYS, arg1: u32, arg2: u32, arg3: u32, arg4: u32, arg5: u
\\ syscall
\\ beq $a3, $zero, 1f
\\ blez $v0, 1f
\\ dsubu $v0, $zero, $v0
\\ subu $v0, $zero, $v0
\\1:
: [ret] "={$2}" (-> u32),
: [number] "{$2}" (@intFromEnum(number)),
@ -121,7 +119,7 @@ pub fn syscall6(
\\ syscall
\\ beq $a3, $zero, 1f
\\ blez $v0, 1f
\\ dsubu $v0, $zero, $v0
\\ subu $v0, $zero, $v0
\\1:
: [ret] "={$2}" (-> u32),
: [number] "{$2}" (@intFromEnum(number)),
@ -148,7 +146,7 @@ pub fn syscall7(
\\ syscall
\\ beq $a3, $zero, 1f
\\ blez $v0, 1f
\\ dsubu $v0, $zero, $v0
\\ subu $v0, $zero, $v0
\\1:
: [ret] "={$2}" (-> u32),
: [number] "{$2}" (@intFromEnum(number)),
@ -171,20 +169,20 @@ pub fn clone() callconv(.naked) u32 {
asm volatile (
\\ # Save function pointer and argument pointer on new thread stack
\\ and $a1, $a1, -16
\\ dsubu $a1, $a1, 16
\\ sd $a0, 0($a1)
\\ sd $a3, 8($a1)
\\ subu $a1, $a1, 16
\\ sw $a0, 0($a1)
\\ sw $a3, 4($a1)
\\
\\ # Shuffle (fn,sp,fl,arg,ptid,tls,ctid) to (fl,sp,ptid,tls,ctid)
\\ move $a0, $a2
\\ move $a2, $a4
\\ move $a3, $a5
\\ move $a4, $a6
\\ li $v0, 5055 # SYS_clone
\\ li $v0, 6055 # SYS_clone
\\ syscall
\\ beq $a3, $zero, 1f
\\ blez $v0, 2f
\\ dsubu $v0, $zero, $v0
\\ subu $v0, $zero, $v0
\\ b 2f
\\1:
\\ beq $v0, $zero, 3f
@ -200,11 +198,11 @@ pub fn clone() callconv(.naked) u32 {
\\ move $ra, $zero
\\
\\ ld $t9, 0($sp)
\\ ld $a0, 8($sp)
\\ ld $a0, 4($sp)
\\ jalr $t9
\\
\\ move $a0, $v0
\\ li $v0, 5058 # SYS_exit
\\ li $v0, 6058 # SYS_exit
\\ syscall
);
}