Rollup merge of #64051 - alex:linux-kernel-module-target, r=joshtriplett
Add x86_64-linux-kernel target This adds a target specification for Linux kernel modules on x86_64, as well as base code that can be shared with other architectures. I wasn't totally sure about what the best name for this was. There's one open question on whether we should use the LLVM generic x86_64-elf target, or the same one used for the Linux userspace. r? @joshtriplett
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commit
043159f918
26
src/librustc_target/spec/linux_kernel_base.rs
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26
src/librustc_target/spec/linux_kernel_base.rs
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@ -0,0 +1,26 @@
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use crate::spec::{LinkArgs, LinkerFlavor, PanicStrategy, RelroLevel, TargetOptions};
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use std::default::Default;
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pub fn opts() -> TargetOptions {
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let mut pre_link_args = LinkArgs::new();
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pre_link_args.insert(
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LinkerFlavor::Gcc,
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vec!["-Wl,--as-needed".to_string(), "-Wl,-z,noexecstack".to_string()],
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);
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TargetOptions {
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disable_redzone: true,
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panic_strategy: PanicStrategy::Abort,
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stack_probes: true,
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eliminate_frame_pointer: false,
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linker_is_gnu: true,
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position_independent_executables: true,
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needs_plt: true,
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relro_level: RelroLevel::Full,
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relocation_model: "static".to_string(),
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target_family: Some("unix".to_string()),
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pre_link_args,
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..Default::default()
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}
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}
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@ -53,6 +53,7 @@ mod freebsd_base;
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mod haiku_base;
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mod hermit_base;
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mod linux_base;
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mod linux_kernel_base;
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mod linux_musl_base;
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mod openbsd_base;
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mod netbsd_base;
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@ -386,6 +387,8 @@ supported_targets! {
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("thumbv7neon-linux-androideabi", thumbv7neon_linux_androideabi),
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("aarch64-linux-android", aarch64_linux_android),
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("x86_64-linux-kernel", x86_64_linux_kernel),
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("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
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("armv6-unknown-freebsd", armv6_unknown_freebsd),
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("armv7-unknown-freebsd", armv7_unknown_freebsd),
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31
src/librustc_target/spec/x86_64_linux_kernel.rs
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src/librustc_target/spec/x86_64_linux_kernel.rs
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@ -0,0 +1,31 @@
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// This defines the amd64 target for the Linux Kernel. See the linux-kernel-base module for
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// generic Linux kernel options.
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use crate::spec::{LinkerFlavor, Target, TargetResult};
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pub fn target() -> TargetResult {
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let mut base = super::linux_kernel_base::opts();
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base.cpu = "x86-64".to_string();
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base.max_atomic_width = Some(64);
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base.features =
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"-mmx,-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-3dnow,-3dnowa,-avx,-avx2,+soft-float"
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.to_string();
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base.code_model = Some("kernel".to_string());
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base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-m64".to_string());
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Ok(Target {
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// FIXME: Some dispute, the linux-on-clang folks think this should use "Linux"
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llvm_target: "x86_64-elf".to_string(),
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target_endian: "little".to_string(),
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target_pointer_width: "64".to_string(),
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target_c_int_width: "32".to_string(),
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data_layout: "e-m:e-i64:64-f80:128-n8:16:32:64-S128".to_string(),
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target_os: "none".to_string(),
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target_env: "gnu".to_string(),
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target_vendor: "unknown".to_string(),
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arch: "x86_64".to_string(),
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linker_flavor: LinkerFlavor::Gcc,
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options: base,
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})
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}
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