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Add x86_64-linux-kernel target
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This adds a target specification for Linux kernel modules on x86_64, as well as base code that can be shared with other architectures.
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alex committed Aug 31, 2019
1 parent b314654 commit 5e933b4
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Showing 3 changed files with 60 additions and 0 deletions.
26 changes: 26 additions & 0 deletions src/librustc_target/spec/linux_kernel_base.rs
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use crate::spec::{LinkArgs, LinkerFlavor, PanicStrategy, RelroLevel, TargetOptions};
use std::default::Default;

pub fn opts() -> TargetOptions {
let mut pre_link_args = LinkArgs::new();
pre_link_args.insert(
LinkerFlavor::Gcc,
vec!["-Wl,--as-needed".to_string(), "-Wl,-z,noexecstack".to_string()],
);

TargetOptions {
disable_redzone: true,
panic_strategy: PanicStrategy::Abort,
stack_probes: true,
eliminate_frame_pointer: false,
linker_is_gnu: true,
position_independent_executables: true,
needs_plt: true,
relro_level: RelroLevel::Full,
relocation_model: "static".to_string(),
target_family: Some("unix".to_string()),
pre_link_args,

..Default::default()
}
}
3 changes: 3 additions & 0 deletions src/librustc_target/spec/mod.rs
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Expand Up @@ -53,6 +53,7 @@ mod freebsd_base;
mod haiku_base;
mod hermit_base;
mod linux_base;
mod linux_kernel_base;
mod linux_musl_base;
mod openbsd_base;
mod netbsd_base;
Expand Down Expand Up @@ -386,6 +387,8 @@ supported_targets! {
("thumbv7neon-linux-androideabi", thumbv7neon_linux_androideabi),
("aarch64-linux-android", aarch64_linux_android),

("x86_64-linux-kernel", x86_64_linux_kernel),

("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
("armv6-unknown-freebsd", armv6_unknown_freebsd),
("armv7-unknown-freebsd", armv7_unknown_freebsd),
Expand Down
31 changes: 31 additions & 0 deletions src/librustc_target/spec/x86_64_linux_kernel.rs
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// This defines the amd64 target for the Linux Kernel. See the linux-kernel-base module for
// generic Linux kernel options.

use crate::spec::{LinkerFlavor, Target, TargetResult};

pub fn target() -> TargetResult {
let mut base = super::linux_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.code_model = Some("kernel".to_string());
base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-m64".to_string());

Ok(Target {
// FIXME: Some dispute, the linux-on-clang folks think this should use "Linux"
llvm_target: "x86_64-elf".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(),
target_os: "none".to_string(),
target_env: "gnu".to_string(),
target_vendor: "unknown".to_string(),
arch: "x86_64".to_string(),
linker_flavor: LinkerFlavor::Gcc,

options: base,
})
}

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