Back to opcode for 32 bit ARM __fastfail

Author: rylev

library/panic_abort/src/lib.rs

@@ -64,7 +64,7 @@ pub unsafe extern "C" fn __rust_start_panic(_payload: usize) -> u32 {
                     if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
                         asm!("int $$0x29", in("ecx") FAST_FAIL_FATAL_APP_EXIT);
                     } else if #[cfg(target_arch = "arm")] {
-                        asm!("brk 0xDEFB", in("r0") FAST_FAIL_FATAL_APP_EXIT);
+                        asm!(".inst 0xDEFB", in("r0") FAST_FAIL_FATAL_APP_EXIT);
                     } else if #[cfg(target_arch = "aarch64")] {
                         asm!("brk 0xF003", in("x0") FAST_FAIL_FATAL_APP_EXIT);
                     } else {

library/std/src/sys/windows/mod.rs

@@ -313,7 +313,7 @@ pub fn abort_internal() -> ! {
                 asm!("int $$0x29", in("ecx") FAST_FAIL_FATAL_APP_EXIT);
                 crate::intrinsics::unreachable();
             } else if #[cfg(target_arch = "arm")] {
-                asm!("brk 0xDEFB", in("r0") FAST_FAIL_FATAL_APP_EXIT);
+                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);