Rollup merge of rust-lang#104077 - nicholasbishop:bishop-uefi-aapcs, r=nagisa

Use aapcs for efiapi calling convention on arm

On arm, [llvm treats the C calling convention as `aapcs` on soft-float targets and `aapcs-vfp` on hard-float targets](rust-lang/compiler-builtins#116 (comment)). UEFI specifies in the arm calling convention that [floating point extensions aren't used](https://uefi.org/specs/UEFI/2.10/02_Overview.html#detailed-calling-convention), so always translate `efiapi` to `aapcs` on arm.

rust-lang#65815

Author: Manishearth

compiler/rustc_target/src/spec/mod.rs

@@ -1911,6 +1911,7 @@ impl Target {
                 Abi::Stdcall { unwind }
             }
             Abi::System { unwind } => Abi::C { unwind },
+            Abi::EfiApi if self.arch == "arm" => Abi::Aapcs { unwind: false },
             Abi::EfiApi if self.arch == "x86_64" => Abi::Win64 { unwind: false },
             Abi::EfiApi => Abi::C { unwind: false },
 

src/test/codegen/abi-efiapi.rs

@@ -27,7 +27,7 @@ trait Copy { }
 //x86_64: define win64cc void @has_efiapi
 //i686: define void @has_efiapi
 //aarch64: define dso_local void @has_efiapi
-//arm: define dso_local void @has_efiapi
+//arm: define dso_local arm_aapcscc void @has_efiapi
 //riscv: define dso_local void @has_efiapi
 #[no_mangle]
 pub extern "efiapi" fn has_efiapi() {}