| 1 | #![allow (unused_imports)] |
| 2 | |
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| 3 | use core::intrinsics; |
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| 4 | |
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| 5 | // NOTE These functions are implemented using assembly because they using a custom |
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| 6 | // calling convention which can't be implemented using a normal Rust function |
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| 7 | |
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| 8 | // NOTE These functions are never mangled as they are not tested against compiler-rt |
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| 9 | |
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| 10 | intrinsics! { |
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| 11 | #[unsafe(naked)] |
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| 12 | #[cfg (all( |
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| 13 | any( |
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| 14 | all(windows, target_env = "gnu" ), |
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| 15 | target_os = "cygwin" , |
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| 16 | target_os = "uefi" |
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| 17 | ), |
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| 18 | not(feature = "no-asm" ) |
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| 19 | ))] |
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| 20 | pub unsafe extern "C" fn ___chkstk_ms() { |
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| 21 | core::arch::naked_asm!( |
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| 22 | "push %rcx" , |
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| 23 | "push %rax" , |
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| 24 | "cmp $0x1000,%rax" , |
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| 25 | "lea 24(%rsp),%rcx" , |
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| 26 | "jb 1f" , |
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| 27 | "2:" , |
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| 28 | "sub $0x1000,%rcx" , |
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| 29 | "test %rcx,(%rcx)" , |
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| 30 | "sub $0x1000,%rax" , |
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| 31 | "cmp $0x1000,%rax" , |
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| 32 | "ja 2b" , |
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| 33 | "1:" , |
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| 34 | "sub %rax,%rcx" , |
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| 35 | "test %rcx,(%rcx)" , |
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| 36 | "pop %rax" , |
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| 37 | "pop %rcx" , |
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| 38 | "ret" , |
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| 39 | options(att_syntax) |
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| 40 | ); |
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| 41 | } |
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| 42 | } |
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| 43 | |
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| 44 | // HACK(https://github.com/rust-lang/rust/issues/62785): x86_64-unknown-uefi needs special LLVM |
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| 45 | // support unless we emit the _fltused |
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| 46 | mod _fltused { |
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| 47 | #[unsafe(no_mangle )] |
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| 48 | #[used ] |
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| 49 | #[cfg (target_os = "uefi" )] |
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| 50 | static _fltused: i32 = 0; |
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| 51 | } |
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| 52 | |
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