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Add __chkstk on i686-pc-windows-gnu. #588

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Apr 10, 2024
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Add __chkstk on i686-pc-windows-gnu. #588

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15 changes: 14 additions & 1 deletion src/x86.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -8,14 +8,27 @@ use core::intrinsics;
// NOTE These functions are never mangled as they are not tested against compiler-rt

intrinsics! {
#[naked]
#[cfg(all(
windows,
target_env = "gnu",
not(feature = "no-asm")
))]
pub unsafe extern "C" fn __chkstk() {
core::arch::asm!(
"jmp __alloca", // Jump to __alloca since fallthrough may be unreliable"
options(noreturn, att_syntax)
);
}

#[naked]
#[cfg(all(
windows,
target_env = "gnu",
not(feature = "no-asm")
))]
pub unsafe extern "C" fn _alloca() {
// _chkstk and _alloca are the same function
// __chkstk and _alloca are the same function
core::arch::asm!(
"push %ecx",
"cmp $0x1000,%eax",
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