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Auto merge of #105861 - Ayush1325:uefi-std-minimial, r=workingjubilee

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Add Minimal Std implementation for UEFI

# Implemented modules:
1. alloc
2. os_str
3. env
4. math

# Related Links
Tracking Issue: https://github.com/rust-lang/rust/issues/100499
API Change Proposal: https://github.com/rust-lang/libs-team/issues/87

# Additional Information
This was originally part of https://github.com/rust-lang/rust/pull/100316. Since that PR was becoming too unwieldy and cluttered, and with suggestion from `@dvdhrm,` I have extracted a minimal std implementation to this PR.

The example in `src/doc/rustc/src/platform-support/unknown-uefi.md` has been tested for `x86_64-unknown-uefi` and `i686-unknown-uefi` in OVMF. It would be great if someone more familiar with AARCH64 can help with testing for that target.

Signed-off-by: Ayush Singh <ayushsingh1325@gmail.com>
This commit is contained in:
bors 2023-09-24 09:47:30 +00:00
commit c7224e3c95
25 changed files with 957 additions and 21 deletions
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1
compiler/rustc_target/src/spec/uefi_msvc_base.rs
View file

@ -46,6 +46,7 @@ pub fn opts() -> TargetOptions {
stack_probes: StackProbeType::Call,
singlethread: true,
linker: Some("rust-lld".into()),
entry_name: "efi_main".into(),
..base
}
}

3
compiler/rustc_target/src/spec/x86_64_unknown_uefi.rs
View file

@ -5,13 +5,14 @@
// The win64 ABI is used. It differs from the sysv64 ABI, so we must use a windows target with
// LLVM. "x86_64-unknown-windows" is used to get the minimal subset of windows-specific features.
use crate::spec::Target;
use crate::{abi::call::Conv, spec::Target};
pub fn target() -> Target {
let mut base = super::uefi_msvc_base::opts();
base.cpu = "x86-64".into();
base.plt_by_default = false;
base.max_atomic_width = Some(64);
base.entry_abi = Conv::X86_64Win64;
// We disable MMX and SSE for now, even though UEFI allows using them. Problem is, you have to
// enable these CPU features explicitly before their first use, otherwise their instructions