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naked functions: on windows emit .endef without the symbol name

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also add test with `fastcall`, which on i686 uses a different mangling scheme
This commit is contained in:
Folkert de Vries 2025-03-11 00:06:03 +01:00
parent 4f52199194
commit c0957ef45a
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2 changed files with 49 additions and 25 deletions
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2
compiler/rustc_codegen_ssa/src/mir/naked_asm.rs
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@ -245,7 +245,7 @@ fn prefix_and_suffix<'tcx>(
writeln!(begin, ".def {asm_name}").unwrap();
writeln!(begin, ".scl 2").unwrap();
writeln!(begin, ".type 32").unwrap();
writeln!(begin, ".endef {asm_name}").unwrap();
writeln!(begin, ".endef").unwrap();
writeln!(begin, "{asm_name}:").unwrap();
writeln!(end).unwrap();

72
tests/codegen/naked-fn/naked-functions.rs
View File

@ -1,10 +1,12 @@
//@ add-core-stubs
//@ revisions: linux win macos thumb
//@ revisions: linux win_x86 win_i686 macos thumb
//
//@[linux] compile-flags: --target x86_64-unknown-linux-gnu
//@[linux] needs-llvm-components: x86
//@[win] compile-flags: --target x86_64-pc-windows-gnu
//@[win] needs-llvm-components: x86
//@[win_x86] compile-flags: --target x86_64-pc-windows-gnu
//@[win_x86] needs-llvm-components: x86
//@[win_i686] compile-flags: --target i686-pc-windows-gnu
//@[win_i686] needs-llvm-components: x86
//@[macos] compile-flags: --target aarch64-apple-darwin
//@[macos] needs-llvm-components: arm
//@[thumb] compile-flags: --target thumbv7em-none-eabi
@ -19,10 +21,11 @@ use minicore::*;
// linux,win: .intel_syntax
//
// linux: .pushsection .text.naked_empty,\22ax\22, @progbits
// macos: .pushsection __TEXT,__text,regular,pure_instructions
// win: .pushsection .text.naked_empty,\22xr\22
// thumb: .pushsection .text.naked_empty,\22ax\22, %progbits
// linux: .pushsection .text.naked_empty,\22ax\22, @progbits
// macos: .pushsection __TEXT,__text,regular,pure_instructions
// win_x86: .pushsection .text.naked_empty,\22xr\22
// win_i686: .pushsection .text._naked_empty,\22xr\22
// thumb: .pushsection .text.naked_empty,\22ax\22, %progbits
//
// CHECK: .balign 4
//
@ -34,10 +37,12 @@ use minicore::*;
//
// linux: .type naked_empty, @function
//
// win: .def naked_empty
// win: .scl 2
// win: .type 32
// win: .endef naked_empty
// win_x86: .def naked_empty
// win_i686: .def _naked_empty
//
// win_x86,win_i686: .scl 2
// win_x86,win_i686: .type 32
// win_x86,win_i686: .endef
//
// thumb: .type naked_empty, %function
// thumb: .thumb
@ -66,10 +71,11 @@ pub unsafe extern "C" fn naked_empty() {
// linux,win: .intel_syntax
//
// linux: .pushsection .text.naked_with_args_and_return,\22ax\22, @progbits
// macos: .pushsection __TEXT,__text,regular,pure_instructions
// win: .pushsection .text.naked_with_args_and_return,\22xr\22
// thumb: .pushsection .text.naked_with_args_and_return,\22ax\22, %progbits
// linux: .pushsection .text.naked_with_args_and_return,\22ax\22, @progbits
// macos: .pushsection __TEXT,__text,regular,pure_instructions
// win_x86: .pushsection .text.naked_with_args_and_return,\22xr\22
// win_i686: .pushsection .text._naked_with_args_and_return,\22xr\22
// thumb: .pushsection .text.naked_with_args_and_return,\22ax\22, %progbits
//
// CHECK: .balign 4
//
@ -81,10 +87,12 @@ pub unsafe extern "C" fn naked_empty() {
//
// linux: .type naked_with_args_and_return, @function
//
// win: .def naked_with_args_and_return
// win: .scl 2
// win: .type 32
// win: .endef naked_with_args_and_return
// win_x86: .def naked_with_args_and_return
// win_i686: .def _naked_with_args_and_return
//
// win_x86,win_i686: .scl 2
// win_x86,win_i686: .type 32
// win_x86,win_i686: .endef
//
// thumb: .type naked_with_args_and_return, %function
// thumb: .thumb
@ -92,7 +100,7 @@ pub unsafe extern "C" fn naked_empty() {
//
// CHECK-LABEL: naked_with_args_and_return:
//
// linux, win: lea rax, [rdi + rsi]
// linux, win_x86,win_i686: lea rax, [rdi + rsi]
// macos: add x0, x0, x1
// thumb: adds r0, r0, r1
//
@ -124,10 +132,10 @@ pub unsafe extern "C" fn naked_with_args_and_return(a: isize, b: isize) -> isize
}
}
// linux: .pushsection .text.some_different_name,\22ax\22, @progbits
// macos: .pushsection .text.some_different_name,regular,pure_instructions
// win: .pushsection .text.some_different_name,\22xr\22
// thumb: .pushsection .text.some_different_name,\22ax\22, %progbits
// linux: .pushsection .text.some_different_name,\22ax\22, @progbits
// macos: .pushsection .text.some_different_name,regular,pure_instructions
// win_x86,win_i686: .pushsection .text.some_different_name,\22xr\22
// thumb: .pushsection .text.some_different_name,\22ax\22, %progbits
// CHECK-LABEL: test_link_section:
#[no_mangle]
#[naked]
@ -139,3 +147,19 @@ pub unsafe extern "C" fn test_link_section() {
#[cfg(all(target_arch = "arm", target_feature = "thumb-mode"))]
naked_asm!("bx lr");
}
// win_x86: .def fastcall_cc
// win_i686: .def @fastcall_cc@4
//
// win_x86,win_i686: .scl 2
// win_x86,win_i686: .type 32
// win_x86,win_i686: .endef
//
// win_x86-LABEL: fastcall_cc:
// win_i686-LABEL: @fastcall_cc@4:
#[cfg(target_os = "windows")]
#[no_mangle]
#[naked]
pub unsafe extern "fastcall" fn fastcall_cc(x: i32) -> i32 {
naked_asm!("ret");
}