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Rollup merge of #66713 - hermitcore:hermit, r=alexcrichton

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introduce a target to build the kernel of the unikernel HermitCore

We are developing the unikernel HermitCore, where the kernel is written in Rust and is already supported by the Rust Standard Library. To compile the kernel with the new build flag "-Z build-std", we introduce a new target, which avoids the usage of SSE & AVX within the kernel.
This commit is contained in:
Tyler Mandry 2019-11-26 17:56:11 -06:00 • committed by GitHub
commit 7ef7005422
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3 changed files with 54 additions and 0 deletions
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27
src/librustc_target/spec/hermit_kernel_base.rs Normal file
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@ -0,0 +1,27 @@
use crate::spec::{LldFlavor, LinkArgs, LinkerFlavor, PanicStrategy, TargetOptions};
use std::default::Default;
pub fn opts() -> TargetOptions {
let mut pre_link_args = LinkArgs::new();
pre_link_args.insert(LinkerFlavor::Lld(LldFlavor::Ld), vec![
"--build-id".to_string(),
"--hash-style=gnu".to_string(),
"--Bstatic".to_string(),
]);
TargetOptions {
disable_redzone: true,
linker: Some("rust-lld".to_owned()),
executables: true,
has_elf_tls: true,
linker_is_gnu: true,
pre_link_args,
no_default_libraries: true,
panic_strategy: PanicStrategy::Abort,
position_independent_executables: true,
relocation_model: "static".to_string(),
target_family: None,
tls_model: "initial-exec".to_string(),
.. Default::default()
}
}

2
src/librustc_target/spec/mod.rs
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@ -54,6 +54,7 @@ mod dragonfly_base;
mod freebsd_base;
mod haiku_base;
mod hermit_base;
mod hermit_kernel_base;
mod linux_base;
mod linux_kernel_base;
mod linux_musl_base;
@ -481,6 +482,7 @@ supported_targets! {
("aarch64-unknown-hermit", aarch64_unknown_hermit),
("x86_64-unknown-hermit", x86_64_unknown_hermit),
("x86_64-unknown-hermit-kernel", x86_64_unknown_hermit_kernel),
("riscv32i-unknown-none-elf", riscv32i_unknown_none_elf),
("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),

25
src/librustc_target/spec/x86_64_unknown_hermit_kernel.rs Normal file
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@ -0,0 +1,25 @@
use crate::spec::{LldFlavor, LinkerFlavor, Target, TargetResult};
pub fn target() -> TargetResult {
let mut base = super::hermit_kernel_base::opts();
base.cpu = "x86-64".to_string();
base.max_atomic_width = Some(64);
base.features =
"-mmx,-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-3dnow,-3dnowa,-avx,-avx2,+soft-float"
.to_string();
base.stack_probes = true;
Ok(Target {
llvm_target: "x86_64-unknown-hermit".to_string(),
target_endian: "little".to_string(),
target_pointer_width: "64".to_string(),
target_c_int_width: "32".to_string(),
data_layout: "e-m:e-i64:64-f80:128-n8:16:32:64-S128".to_string(),
arch: "x86_64".to_string(),
target_os: "hermit".to_string(),
target_env: String::new(),
target_vendor: "unknown".to_string(),
linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
options: base,
})
}