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VDSO calls must use the C CC

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LemonBoy 2019-05-16 23:38:00 +02:00 committed by Andrew Kelley
parent 2eba779af5
commit 51aaa02679
1 changed files with 5 additions and 2 deletions
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7
std/os/linux.zig
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@ -961,11 +961,14 @@ pub fn waitpid(pid: i32, status: *i32, options: i32) usize {
var vdso_clock_gettime = @ptrCast(?*const c_void, init_vdso_clock_gettime);
// We must follow the C calling convention when we call into the VDSO
const vdso_clock_gettime_ty = extern fn (i32, *timespec) usize;
pub fn clock_gettime(clk_id: i32, tp: *timespec) usize {
if (VDSO_CGT_SYM.len != 0) {
const ptr = @atomicLoad(?*const c_void, &vdso_clock_gettime, .Unordered);
if (ptr) |fn_ptr| {
const f = @ptrCast(@typeOf(clock_gettime), fn_ptr);
const f = @ptrCast(vdso_clock_gettime_ty, fn_ptr);
const rc = f(clk_id, tp);
switch (rc) {
0, @bitCast(usize, isize(-EINVAL)) => return rc,
@ -983,7 +986,7 @@ extern fn init_vdso_clock_gettime(clk: i32, ts: *timespec) usize {
_ = @cmpxchgStrong(?*const c_void, &vdso_clock_gettime, &init_vdso_clock_gettime, ptr, .Monotonic, .Monotonic);
// Call into the VDSO if available
if (ptr) |fn_ptr| {
const f = @ptrCast(@typeOf(clock_gettime), fn_ptr);
const f = @ptrCast(vdso_clock_gettime_ty, fn_ptr);
return f(clk, ts);
}
return @bitCast(usize, isize(-ENOSYS));