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linux: instead of export elf_aux_maybe, export getauxval itself

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This commit is contained in:
kcbanner 2023-08-27 11:12:31 -04:00
parent 731c6d3fbb
commit fba81cd606
1 changed files with 6 additions and 5 deletions
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11
lib/std/os/linux.zig
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@ -153,13 +153,11 @@ pub usingnamespace @import("linux/io_uring.zig");
/// Set by startup code, used by `getauxval`.
pub var elf_aux_maybe: ?[*]std.elf.Auxv = null;
pub extern var _elf_aux_maybe: ?[*]std.elf.Auxv;
comptime {
@export(elf_aux_maybe, .{ .name = "_elf_aux_maybe", .linkage = .Weak });
}
/// See `std.elf` for the constants.
pub fn getauxval(index: usize) usize {
/// This matches the libc getauxval function.
pub extern fn getauxval(index: usize) usize;
fn getauxvalImpl(index: usize) callconv(.C) usize {
const auxv = elf_aux_maybe orelse return 0;
var i: usize = 0;
while (auxv[i].a_type != std.elf.AT_NULL) : (i += 1) {
@ -168,6 +166,9 @@ pub fn getauxval(index: usize) usize {
}
return 0;
}
comptime {
@export(getauxvalImpl, .{ .name = "getauxval", .linkage = .Weak });
}
// Some architectures (and some syscalls) require 64bit parameters to be passed
// in a even-aligned register pair.