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std.os.linux: fix the mmap2 unit for various architectures

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closes https://codeberg.org/ziglang/zig/issues/31033
This commit is contained in:
Alex Rønne Petersen 2026-02-20 01:27:54 +01:00
parent 7dddcd043f
commit e95132476d
1 changed files with 9 additions and 1 deletions
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10
lib/std/os/linux.zig
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@ -1118,6 +1118,14 @@ pub fn pivot_root(new_root: [*:0]const u8, put_old: [*:0]const u8) usize {
return syscall2(.pivot_root, @intFromPtr(new_root), @intFromPtr(put_old));
}
fn mmap2Unit() u64 {
return switch (native_arch) {
.arc, .arceb, .m68k => std.heap.pageSize(),
.or1k => 8 << 10,
else => 4 << 10,
};
}
pub fn mmap(address: ?[*]u8, length: usize, prot: PROT, flags: MAP, fd: i32, offset: i64) usize {
if (@hasField(SYS, "mmap2")) {
return syscall6(
@ -1127,7 +1135,7 @@ pub fn mmap(address: ?[*]u8, length: usize, prot: PROT, flags: MAP, fd: i32, off
@as(u32, @bitCast(prot)),
@as(u32, @bitCast(flags)),
@bitCast(@as(isize, fd)),
@truncate(@as(u64, @bitCast(offset)) / std.heap.pageSize()),
@truncate(@as(u64, @bitCast(offset)) / mmap2Unit()),
);
} else {
// The s390x mmap() syscall existed before Linux supported syscalls with 5+ parameters, so