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Add __fastfail for Windows on arm/aarch64 #75990

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merged 4 commits into from
Aug 30, 2020
Merged

Add __fastfail for Windows on arm/aarch64 #75990

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970e779
Add __fastfail for Windows on arm/aarch64
rylev Aug 27, 2020
8bcc4d6
Switch to asm! macro and use brk instruction on ARM
rylev Aug 28, 2020
9e2228d
Back to opcode for 32 bit ARM __fastfail
rylev Aug 28, 2020
d931e97
Explicitly look for 'thumb-mode' before using __fastfail on 'arm'
rylev Aug 29, 2020
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17 changes: 14 additions & 3 deletions library/panic_abort/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@
#![feature(panic_runtime)]
#![feature(staged_api)]
#![feature(rustc_attrs)]
#![feature(llvm_asm)]
#![feature(asm)]

use core::any::Any;

Expand Down Expand Up @@ -47,7 +47,7 @@ pub unsafe extern "C" fn __rust_start_panic(_payload: usize) -> u32 {
}
__rust_abort();
}
} else if #[cfg(all(windows, any(target_arch = "x86", target_arch = "x86_64")))] {
} else if #[cfg(windows)] {
// On Windows, use the processor-specific __fastfail mechanism. In Windows 8
// and later, this will terminate the process immediately without running any
// in-process exception handlers. In earlier versions of Windows, this
Expand All @@ -59,7 +59,18 @@ pub unsafe extern "C" fn __rust_start_panic(_payload: usize) -> u32 {
//
// Note: this is the same implementation as in libstd's `abort_internal`
unsafe fn abort() -> ! {
llvm_asm!("int $$0x29" :: "{ecx}"(7) ::: volatile); // 7 is FAST_FAIL_FATAL_APP_EXIT
const FAST_FAIL_FATAL_APP_EXIT: usize = 7;
cfg_if::cfg_if! {
if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
asm!("int $$0x29", in("ecx") FAST_FAIL_FATAL_APP_EXIT);
} else if #[cfg(all(target_arch = "arm", target_feature = "thumb-mode"))] {
asm!(".inst 0xDEFB", in("r0") FAST_FAIL_FATAL_APP_EXIT);
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} else if #[cfg(target_arch = "aarch64")] {
asm!("brk 0xF003", in("x0") FAST_FAIL_FATAL_APP_EXIT);
} else {
core::intrinsics::abort();
}
}
core::intrinsics::unreachable();
}
} else {
Expand Down
16 changes: 13 additions & 3 deletions library/std/src/sys/windows/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -306,10 +306,20 @@ pub fn dur2timeout(dur: Duration) -> c::DWORD {
/// that function for more information on `__fastfail`
#[allow(unreachable_code)]
pub fn abort_internal() -> ! {
#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
const FAST_FAIL_FATAL_APP_EXIT: usize = 7;
unsafe {
llvm_asm!("int $$0x29" :: "{ecx}"(7) ::: volatile); // 7 is FAST_FAIL_FATAL_APP_EXIT
crate::intrinsics::unreachable();
cfg_if::cfg_if! {
if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
asm!("int $$0x29", in("ecx") FAST_FAIL_FATAL_APP_EXIT);
crate::intrinsics::unreachable();
} else if #[cfg(all(target_arch = "arm", target_feature = "thumb-mode"))] {
asm!(".inst 0xDEFB", in("r0") FAST_FAIL_FATAL_APP_EXIT);
crate::intrinsics::unreachable();
} else if #[cfg(target_arch = "aarch64")] {
asm!("brk 0xF003", in("x0") FAST_FAIL_FATAL_APP_EXIT);
crate::intrinsics::unreachable();
}
}
}
crate::intrinsics::abort();
}