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// SPDX-License-Identifier: GPL-2.0
//! The custom target specification file generator for `rustc`.
//!
//! To configure a target from scratch, a JSON-encoded file has to be passed
//! to `rustc` (introduced in [RFC 131]). These options and the file itself are
//! unstable. Eventually, `rustc` should provide a way to do this in a stable
//! manner. For instance, via command-line arguments. Therefore, this file
//! should avoid using keys which can be set via `-C` or `-Z` options.
//!
//! [RFC 131]: https://rust-lang.github.io/rfcs/0131-target-specification.html
use std::{
collections::HashMap,
fmt::{Display, Formatter, Result},
io::BufRead,
};
enum Value {
Boolean(bool),
Number(i32),
String(String),
Object(Object),
}
type Object = Vec<(String, Value)>;
/// Minimal "almost JSON" generator (e.g. no `null`s, no arrays, no escaping),
/// enough for this purpose.
impl Display for Value {
fn fmt(&self, formatter: &mut Formatter<'_>) -> Result {
match self {
Value::Boolean(boolean) => write!(formatter, "{}", boolean),
Value::Number(number) => write!(formatter, "{}", number),
Value::String(string) => write!(formatter, "\"{}\"", string),
Value::Object(object) => {
formatter.write_str("{")?;
if let [ref rest @ .., ref last] = object[..] {
for (key, value) in rest {
write!(formatter, "\"{}\": {},", key, value)?;
}
write!(formatter, "\"{}\": {}", last.0, last.1)?;
}
formatter.write_str("}")
}
}
}
}
struct TargetSpec(Object);
impl TargetSpec {
fn new() -> TargetSpec {
TargetSpec(Vec::new())
}
}
trait Push<T> {
fn push(&mut self, key: &str, value: T);
}
impl Push<bool> for TargetSpec {
fn push(&mut self, key: &str, value: bool) {
self.0.push((key.to_string(), Value::Boolean(value)));
}
}
impl Push<i32> for TargetSpec {
fn push(&mut self, key: &str, value: i32) {
self.0.push((key.to_string(), Value::Number(value)));
}
}
impl Push<String> for TargetSpec {
fn push(&mut self, key: &str, value: String) {
self.0.push((key.to_string(), Value::String(value)));
}
}
impl Push<&str> for TargetSpec {
fn push(&mut self, key: &str, value: &str) {
self.push(key, value.to_string());
}
}
impl Push<Object> for TargetSpec {
fn push(&mut self, key: &str, value: Object) {
self.0.push((key.to_string(), Value::Object(value)));
}
}
impl Display for TargetSpec {
fn fmt(&self, formatter: &mut Formatter<'_>) -> Result {
// We add some newlines for clarity.
formatter.write_str("{\n")?;
if let [ref rest @ .., ref last] = self.0[..] {
for (key, value) in rest {
write!(formatter, " \"{}\": {},\n", key, value)?;
}
write!(formatter, " \"{}\": {}\n", last.0, last.1)?;
}
formatter.write_str("}")
}
}
struct KernelConfig(HashMap<String, String>);
impl KernelConfig {
/// Parses `include/config/auto.conf` from `stdin`.
fn from_stdin() -> KernelConfig {
let mut result = HashMap::new();
let stdin = std::io::stdin();
let mut handle = stdin.lock();
let mut line = String::new();
loop {
line.clear();
if handle.read_line(&mut line).unwrap() == 0 {
break;
}
if line.starts_with('#') {
continue;
}
let (key, value) = line.split_once('=').expect("Missing `=` in line.");
result.insert(key.to_string(), value.trim_end_matches('\n').to_string());
}
KernelConfig(result)
}
/// Does the option exist in the configuration (any value)?
///
/// The argument must be passed without the `CONFIG_` prefix.
/// This avoids repetition and it also avoids `fixdep` making us
/// depend on it.
fn has(&self, option: &str) -> bool {
let option = "CONFIG_".to_owned() + option;
self.0.contains_key(&option)
}
}
fn main() {
let cfg = KernelConfig::from_stdin();
let mut ts = TargetSpec::new();
// `llvm-target`s are taken from `scripts/Makefile.clang`.
if cfg.has("X86_64") {
ts.push("arch", "x86_64");
ts.push(
"data-layout",
"e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128",
);
let mut features = "-3dnow,-3dnowa,-mmx,+soft-float".to_string();
if cfg.has("MITIGATION_RETPOLINE") {
features += ",+retpoline-external-thunk";
}
ts.push("features", features);
ts.push("llvm-target", "x86_64-linux-gnu");
ts.push("target-pointer-width", "64");
} else {
panic!("Unsupported architecture");
}
ts.push("emit-debug-gdb-scripts", false);
ts.push("frame-pointer", "may-omit");
ts.push(
"stack-probes",
vec![("kind".to_string(), Value::String("none".to_string()))],
);
// Everything else is LE, whether `CPU_LITTLE_ENDIAN` is declared or not
// (e.g. x86). It is also `rustc`'s default.
if cfg.has("CPU_BIG_ENDIAN") {
ts.push("target-endian", "big");
}
println!("{}", ts);
}
| Name | Type | Size | Permission | Actions |
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| atomic | Folder | 0755 |
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| coccinelle | Folder | 0755 |
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| gcc-plugins | Folder | 0755 |
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| gdb | Folder | 0755 |
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| genksyms | Folder | 0755 |
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| include | Folder | 0755 |
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| kconfig | Folder | 0755 |
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| ksymoops | Folder | 0755 |
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| mod | Folder | 0755 |
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| package | Folder | 0755 |
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| Kbuild.include | File | 10.24 KB | 0644 |
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| Kconfig.include | File | 2.56 KB | 0644 |
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| Lindent | File | 506 B | 0755 |
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| adjust_autoksyms.sh | File | 2.11 KB | 0755 |
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| cc-can-link.sh | File | 170 B | 0755 |
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| cleanfile | File | 3.46 KB | 0755 |
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| config | File | 4.67 KB | 0755 |
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| decodecode | File | 2.89 KB | 0755 |
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| documentation-file-ref-check | File | 5.6 KB | 0755 |
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| extract-cert | File | 14.12 KB | 0755 |
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| extract-module-sig.pl | File | 3.65 KB | 0755 |
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| file-size.sh | File | 90 B | 0755 |
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| find-unused-docs.sh | File | 1.28 KB | 0755 |
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| gcc-ld | File | 715 B | 0755 |
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| gcc-x86_32-has-stack-protector.sh | File | 412 B | 0755 |
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| gcc-x86_64-has-stack-protector.sh | File | 202 B | 0755 |
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| gen_autoksyms.sh | File | 1.4 KB | 0755 |
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| gen_ksymdeps.sh | File | 403 B | 0755 |
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| gen_packed_field_checks.c | File | 1.19 KB | 0644 |
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| generate_initcall_order.pl | File | 5.94 KB | 0755 |
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| generate_rust_target.rs | File | 5.26 KB | 0644 |
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| get_abi.pl | File | 15.09 KB | 0755 |
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| get_dvb_firmware | File | 24.54 KB | 0755 |
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| get_feat.pl | File | 14.34 KB | 0755 |
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| gfp-translate | File | 1.71 KB | 0755 |
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| headerdep.pl | File | 3.5 KB | 0755 |
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| headers_check.pl | File | 3.73 KB | 0755 |
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| headers_install.sh | File | 3.17 KB | 0755 |
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| insert-sys-cert.c | File | 8.87 KB | 0644 |
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| install.sh | File | 990 B | 0755 |
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| jobserver-exec | File | 2.16 KB | 0755 |
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| kallsyms | File | 18.23 KB | 0755 |
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| kallsyms.c | File | 20.38 KB | 0644 |
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| kernel-doc | File | 66.32 KB | 0755 |
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| ld-version.sh | File | 1.67 KB | 0755 |
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| leaking_addresses.pl | File | 12.8 KB | 0755 |
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| link-vmlinux.sh | File | 8.88 KB | 0755 |
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| markup_oops.pl | File | 7.92 KB | 0755 |
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| min-tool-version.sh | File | 473 B | 0755 |
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| mkcompile_h | File | 2.59 KB | 0755 |
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| mkuboot.sh | File | 418 B | 0755 |
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| module.lds.S | File | 1.49 KB | 0644 |
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| modules-check.sh | File | 431 B | 0755 |
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| nsdeps | File | 1.63 KB | 0644 |
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| objdiff | File | 2.83 KB | 0755 |
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| objdump-func | File | 715 B | 0755 |
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| pahole-version.sh | File | 273 B | 0755 |
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| parse-maintainers.pl | File | 4.54 KB | 0755 |
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| patch-kernel | File | 9.95 KB | 0755 |
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| profile2linkerlist.pl | File | 410 B | 0755 |
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| prune-kernel | File | 712 B | 0755 |
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| recordmcount.c | File | 16.69 KB | 0644 |
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| recordmcount.h | File | 19.37 KB | 0644 |
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| recordmcount.pl | File | 17.61 KB | 0755 |
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| remove-stale-files | File | 1.35 KB | 0755 |
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| setlocalversion | File | 3.59 KB | 0755 |
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| show_delta | File | 3.01 KB | 0755 |
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| sign-file | File | 22.16 KB | 0755 |
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| sign-file.c | File | 9.93 KB | 0644 |
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| sorttable | File | 22.12 KB | 0755 |
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| sorttable.c | File | 7.62 KB | 0644 |
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| sorttable.h | File | 12.85 KB | 0644 |
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| spdxcheck-test.sh | File | 323 B | 0644 |
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| spelling.txt | File | 31.92 KB | 0644 |
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| sphinx-pre-install | File | 24.29 KB | 0755 |
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| split-man.pl | File | 600 B | 0755 |
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| stackdelta | File | 1.84 KB | 0755 |
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| stackusage | File | 798 B | 0755 |
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| subarch.include | File | 641 B | 0644 |
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| syscallhdr.sh | File | 1.89 KB | 0755 |
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| syscallnr.sh | File | 1.45 KB | 0644 |
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| syscalltbl.sh | File | 1.46 KB | 0755 |
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| tags.sh | File | 9.66 KB | 0755 |
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| test_fortify.sh | File | 2.23 KB | 0644 |
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| tools-support-relr.sh | File | 550 B | 0755 |
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| unifdef | File | 34.12 KB | 0755 |
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| unifdef.c | File | 34.8 KB | 0644 |
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| ver_linux | File | 2.59 KB | 0755 |
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| xen-hypercalls.sh | File | 386 B | 0644 |
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| xz_wrap.sh | File | 567 B | 0755 |
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