src/librustc_back/target/l4re_base.rs

   1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use PanicStrategy;
  12 use LinkerFlavor;
  13 use target::{LinkArgs, TargetOptions};
  14 use std::default::Default;
  15 use std::env;
  16 use std::process::Command;
  17
  18 // Use GCC to locate code for crt* libraries from the host, not from L4Re. Note
  19 // that a few files also come from L4Re, for these, the function shouldn't be
  20 // used. This uses GCC for the location of the file, but GCC is required for L4Re anyway.
  21 fn get_path_or(filename: &str) -> String {
  22     let child = Command::new("gcc")
  23         .arg(format!("-print-file-name={}", filename)).output()
  24         .expect("Failed to execute GCC");
  25     String::from_utf8(child.stdout)
  26         .expect("Couldn't read path from GCC").trim().into()
  27 }
  28
  29 pub fn opts() -> Result<TargetOptions, String> {
  30     let l4re_lib_path = env::var_os("L4RE_LIBDIR").ok_or("Unable to find L4Re \
  31         library directory: L4RE_LIBDIR not set.")?.into_string().unwrap();
  32     let mut pre_link_args = LinkArgs::new();
  33     pre_link_args.insert(LinkerFlavor::Ld, vec![
  34         format!("-T{}/main_stat.ld", l4re_lib_path),
  35         "--defsym=__executable_start=0x01000000".to_string(),
  36         "--defsym=__L4_KIP_ADDR__=0x6ffff000".to_string(),
  37         format!("{}/crt1.o", l4re_lib_path),
  38         format!("{}/crti.o", l4re_lib_path),
  39         get_path_or("crtbeginT.o"),
  40     ]);
  41     let mut post_link_args = LinkArgs::new();
  42     post_link_args.insert(LinkerFlavor::Ld, vec![
  43         format!("{}/l4f/libpthread.a", l4re_lib_path),
  44         format!("{}/l4f/libc_be_sig.a", l4re_lib_path),
  45         format!("{}/l4f/libc_be_sig_noop.a", l4re_lib_path),
  46         format!("{}/l4f/libc_be_socket_noop.a", l4re_lib_path),
  47         format!("{}/l4f/libc_be_fs_noop.a", l4re_lib_path),
  48         format!("{}/l4f/libc_be_sem_noop.a", l4re_lib_path),
  49         format!("{}/l4f/libl4re-vfs.o.a", l4re_lib_path),
  50         format!("{}/l4f/lib4re.a", l4re_lib_path),
  51         format!("{}/l4f/lib4re-util.a", l4re_lib_path),
  52         format!("{}/l4f/libc_support_misc.a", l4re_lib_path),
  53         format!("{}/l4f/libsupc++.a", l4re_lib_path),
  54         format!("{}/l4f/lib4shmc.a", l4re_lib_path),
  55         format!("{}/l4f/lib4re-c.a", l4re_lib_path),
  56         format!("{}/l4f/lib4re-c-util.a", l4re_lib_path),
  57         get_path_or("libgcc_eh.a"),
  58         format!("{}/l4f/libdl.a", l4re_lib_path),
  59         "--start-group".to_string(),
  60         format!("{}/l4f/libl4util.a", l4re_lib_path),
  61         format!("{}/l4f/libc_be_l4re.a", l4re_lib_path),
  62         format!("{}/l4f/libuc_c.a", l4re_lib_path),
  63         format!("{}/l4f/libc_be_l4refile.a", l4re_lib_path),
  64         "--end-group".to_string(),
  65         format!("{}/l4f/libl4sys.a", l4re_lib_path),
  66         "-gc-sections".to_string(),
  67         get_path_or("crtend.o"),
  68         format!("{}/crtn.o", l4re_lib_path),
  69     ]);
  70
  71     Ok(TargetOptions {
  72         executables: true,
  73         has_elf_tls: false,
  74         exe_allocation_crate: None,
  75         panic_strategy: PanicStrategy::Abort,
  76         pre_link_args,
  77         post_link_args,
  78         target_family: Some("unix".to_string()),
  79         .. Default::default()
  80     })
  81 }