Implement some functions on Linux

.gitignore

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-/Cargo.lock
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Cargo.toml

@@ -8,17 +8,16 @@ name = "c"
 crate-type = ["staticlib"]
 
 [workspace]
+members = ["crt0"]
 
 [dependencies]
+compiler_builtins = { git = "https://github.com/rust-lang-nursery/compiler-builtins.git", default-features = false, features = ["mem"] }
+platform = { path = "platform" }
 fcntl = { path = "fcntl" }
 unistd = { path = "unistd" }
 
 [profile.dev]
-incremental = false
-lto = true
 panic = "abort"
 
 [profile.release]
-incremental = false
-lto = true
 panic = "abort"

crt0/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "crt0"
+version = "0.1.0"
+authors = ["Jeremy Soller <[email protected]>"]
+
+[lib]
+name = "crt0"
+crate-type = ["staticlib"]
+
+[dependencies]
+platform = { path = "../platform" }

crt0/src/lib.rs

@@ -0,0 +1,37 @@
+//! crt0
+
+#![no_std]
+#![feature(asm)]
+#![feature(lang_items)]
+#![feature(naked_functions)]
+
+extern crate platform;
+
+use platform::types::*;
+
+#[no_mangle]
+#[naked]
+pub unsafe extern "C" fn _start() {
+    asm!("mov rdi, rsp
+        call _start_rust"
+        :
+        :
+        :
+        : "intel"
+    );
+}
+
+#[inline(never)]
+#[no_mangle]
+pub unsafe extern "C" fn _start_rust(sp: usize) -> ! {
+    extern "C" {
+        fn main(argc: c_int, argv: *const *const c_char) -> c_int;
+    }
+
+    platform::exit(main(0, 0 as *const *const c_char));
+}
+
+#[lang = "panic_fmt"]
+pub extern "C" fn rust_begin_unwind(fmt: ::core::fmt::Arguments, file: &str, line: u32) -> ! {
+    loop {}
+}

fcntl/Cargo.toml

@@ -8,4 +8,4 @@ build = "build.rs"
 cbindgen = { path = "../cbindgen" }
 
 [dependencies]
-common = { path = "../common" }
+platform = { path = "../platform" }

fcntl/src/lib.rs

@@ -2,9 +2,19 @@
 
 #![no_std]
 
-extern crate common;
+extern crate platform;
 
-pub use common::*;
+use platform::types::*;
+
+pub use sys::*;
+
+#[cfg(target_os = "linux")]
+#[path="linux.rs"]
+pub mod sys;
+
+#[cfg(target_os = "redox")]
+#[path="redox.rs"]
+pub mod sys;
 
 pub const F_DUPFD: c_int = 0;
 pub const F_GETFD: c_int = 1;
@@ -21,25 +31,6 @@ pub const F_RDLCK: c_int = 0;
 pub const F_WRLCK: c_int = 1;
 pub const F_UNLCK: c_int = 2;
 
-pub const O_RDONLY: c_int =     0x0001_0000;
-pub const O_WRONLY: c_int =     0x0002_0000;
-pub const O_RDWR: c_int =       0x0003_0000;
-pub const O_NONBLOCK: c_int =   0x0004_0000;
-pub const O_APPEND: c_int =     0x0008_0000;
-pub const O_SHLOCK: c_int =     0x0010_0000;
-pub const O_EXLOCK: c_int =     0x0020_0000;
-pub const O_ASYNC: c_int =      0x0040_0000;
-pub const O_FSYNC: c_int =      0x0080_0000;
-pub const O_CLOEXEC: c_int =    0x0100_0000;
-pub const O_CREAT: c_int =      0x0200_0000;
-pub const O_TRUNC: c_int =      0x0400_0000;
-pub const O_EXCL: c_int =       0x0800_0000;
-pub const O_DIRECTORY: c_int =  0x1000_0000;
-pub const O_STAT: c_int =       0x2000_0000;
-pub const O_SYMLINK: c_int =    0x4000_0000;
-pub const O_NOFOLLOW: c_int =   0x8000_0000;
-pub const O_ACCMODE: c_int = O_RDONLY | O_WRONLY | O_RDWR;
-
 #[no_mangle]
 pub extern "C" fn creat(path: *const c_char, mode: mode_t) -> c_int {
     open(path, O_WRONLY | O_CREAT | O_TRUNC, mode)
@@ -52,7 +43,7 @@ pub extern "C" fn fcntl(fildes: c_int, cmd: c_int, arg: c_int) -> c_int {
 
 #[no_mangle]
 pub extern "C" fn open(path: *const c_char, oflag: c_int, mode: mode_t) -> c_int {
-    unimplemented!();
+    platform::open(path, oflag, mode)
 }
 
 /*

fcntl/src/linux.rs

@@ -0,0 +1,8 @@
+use platform::types::*;
+
+pub const O_RDONLY: c_int =     0x0000;
+pub const O_WRONLY: c_int =     0x0001;
+pub const O_RDWR: c_int =       0x0002;
+pub const O_CREAT: c_int =      0x0040;
+pub const O_TRUNC: c_int =      0x0200;
+pub const O_ACCMODE: c_int = O_RDONLY | O_WRONLY | O_RDWR;

fcntl/src/redox.rs

@@ -0,0 +1,20 @@
+use platform::types::*;
+
+pub const O_RDONLY: c_int =     0x0001_0000;
+pub const O_WRONLY: c_int =     0x0002_0000;
+pub const O_RDWR: c_int =       0x0003_0000;
+pub const O_NONBLOCK: c_int =   0x0004_0000;
+pub const O_APPEND: c_int =     0x0008_0000;
+pub const O_SHLOCK: c_int =     0x0010_0000;
+pub const O_EXLOCK: c_int =     0x0020_0000;
+pub const O_ASYNC: c_int =      0x0040_0000;
+pub const O_FSYNC: c_int =      0x0080_0000;
+pub const O_CLOEXEC: c_int =    0x0100_0000;
+pub const O_CREAT: c_int =      0x0200_0000;
+pub const O_TRUNC: c_int =      0x0400_0000;
+pub const O_EXCL: c_int =       0x0800_0000;
+pub const O_DIRECTORY: c_int =  0x1000_0000;
+pub const O_STAT: c_int =       0x2000_0000;
+pub const O_SYMLINK: c_int =    0x4000_0000;
+pub const O_NOFOLLOW: c_int =   0x8000_0000;
+pub const O_ACCMODE: c_int = O_RDONLY | O_WRONLY | O_RDWR;

include/sys/types.h

@@ -4,6 +4,8 @@
 typedef int gid_t;
 typedef int uid_t;
 
+typedef int mode_t;
+
 typedef long off_t;
 
 typedef int pid_t;

common/Cargo.toml → platform/Cargo.toml

@@ -1,4 +1,7 @@
 [package]
-name = "common"
+name = "platform"
 version = "0.1.0"
 authors = ["Jeremy Soller <[email protected]>"]
+
+[dependencies]
+syscall = "0.2"

platform/src/lib.rs

@@ -0,0 +1,19 @@
+//! fcntl implementation for Redox, following http://pubs.opengroup.org/onlinepubs/7908799/xsh/fcntl.h.html
+
+#![no_std]
+#![allow(non_camel_case_types)]
+
+#[macro_use]
+extern crate syscall;
+
+pub use sys::*;
+
+#[cfg(all(not(feature="no_std"), target_os = "linux"))]
+#[path="linux/mod.rs"]
+mod sys;
+
+#[cfg(all(not(feature="no_std"), target_os = "redox"))]
+#[path="redox/mod.rs"]
+mod sys;
+
+pub mod types;

platform/src/linux/mod.rs

@@ -0,0 +1,26 @@
+use types::*;
+
+pub fn close(fildes: c_int) -> c_int {
+    unsafe {
+        syscall!(CLOSE, fildes) as c_int
+    }
+}
+
+pub fn exit(status: c_int) -> ! {
+    unsafe {
+        syscall!(EXIT, status);
+    }
+    loop {}
+}
+
+pub fn open(path: *const c_char, oflag: c_int, mode: mode_t) -> c_int {
+    unsafe {
+        syscall!(OPEN, path, oflag, mode) as c_int
+    }
+}
+
+pub fn write(fildes: c_int, buf: &[u8]) -> ssize_t {
+    unsafe {
+        syscall!(WRITE, fildes, buf.as_ptr(), buf.len()) as ssize_t
+    }
+}

platform/src/redox/mod.rs

@@ -0,0 +1,8 @@
+pub fn exit(status: c_int) -> ! {
+    syscall::exit(status);
+}
+
+pub fn write(fd: c_int, buf: &[u8]) -> ssize_t {
+    syscall::write(fd, buf);
+    buf.len() as ssize_t
+}

common/src/lib.rs → platform/src/types.rs

@@ -1,8 +1,3 @@
-//! fcntl implementation for Redox, following http://pubs.opengroup.org/onlinepubs/7908799/xsh/fcntl.h.html
-
-#![no_std]
-#![allow(non_camel_case_types)]
-
 // Use repr(u8) as LLVM expects `void*` to be the same as `i8*` to help enable
 // more optimization opportunities around it recognizing things like
 // malloc/free.

rust-toolchain

@@ -0,0 +1 @@
+nightly-2018-03-02

src/lib.rs

@@ -1,14 +1,32 @@
 #![no_std]
 #![feature(lang_items)]
 
+extern crate compiler_builtins;
+extern crate platform;
+
 extern crate fcntl;
 extern crate unistd;
 
 pub use fcntl::*;
 pub use unistd::*;
 
+use core::fmt;
+
+struct PanicWriter;
+
+impl fmt::Write for PanicWriter {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        platform::write(2, s.as_bytes());
+        Ok(())
+    }
+}
+
 #[lang = "panic_fmt"]
 #[no_mangle]
-pub extern "C" fn rust_begin_unwind(fmt: ::core::fmt::Arguments, file: &str, line: u32) -> ! {
-    loop {}
+pub extern "C" fn rust_begin_unwind(fmt: fmt::Arguments, file: &str, line: u32) -> ! {
+    use fmt::Write;
+
+    let _ = PanicWriter.write_fmt(format_args!("{}:{}: {}\n", file, line, fmt));
+
+    platform::exit(1);
 }

test.sh

@@ -0,0 +1,7 @@
+set -ex
+
+cargo build
+cargo build --manifest-path crt0/Cargo.toml
+cd tests
+make clean
+make run

tests/.gitignore

@@ -1 +1,3 @@
+/create
+/create.out
 /write

tests/Makefile

@@ -1,5 +1,14 @@
-write: write.c
-	gcc -nostdinc -nostdlib -I ../include -I ../target/include $< ../target/debug/libc.a -o $@
+BINS=\
+	create \
+	write
+
+all: $(BINS)
 
 clean:
-	rm -f write
+	rm -f $(BINS)
+
+run: $(BINS)
+	for bin in $(BINS); do echo "\\033[1m$${bin}\\033[0m"; ./$${bin}; done
+
+%: %.c
+	gcc -nostdinc -nostdlib -I ../include -I ../target/include ../target/debug/libcrt0.a $< ../target/debug/libc.a -o $@

tests/create.c

@@ -0,0 +1,14 @@
+#include <fcntl.h>
+#include <unistd.h>
+
+int main(int argc, char **argv) {
+    int fd = creat("create.out", 0755);
+    if (fd >= 0) {
+        write(fd, "Hello World!\n", 14);
+        close(fd);
+        return 0;
+    } else {
+        write(2, "creat failed\n", 14);
+        return 1;
+    }
+}

tests/write.c

@@ -1,5 +1,6 @@
 #include <unistd.h>
 
-void _start(void) {
+int main(int argc, char **argv) {
     write(STDOUT_FILENO, "Hello World!\n", 14);
+    return 0;
 }

unistd/Cargo.toml

@@ -8,4 +8,4 @@ build = "build.rs"
 cbindgen = { path = "../cbindgen" }
 
 [dependencies]
-common = { path = "../common" }
+platform = { path = "../platform" }

unistd/src/lib.rs

@@ -2,9 +2,9 @@
 
 #![no_std]
 
-extern crate common;
+extern crate platform;
 
-pub use common::*;
+pub use platform::types::*;
 
 pub const NULL: c_int = 0;
 
@@ -28,7 +28,7 @@ pub const STDERR_FILENO: c_int = 2;
 
 #[no_mangle]
 pub extern "C" fn _exit(status: c_int) {
-    unimplemented!();
+    platform::exit(status)
 }
 
 #[no_mangle]
@@ -63,7 +63,7 @@ pub extern "C" fn chown(path: *const c_char, owner: uid_t, group: gid_t) -> c_in
 
 #[no_mangle]
 pub extern "C" fn close(fildes: c_int) -> c_int {
-    unimplemented!();
+    platform::close(fildes)
 }
 
 #[no_mangle]
@@ -448,7 +448,10 @@ pub extern "C" fn vfork() -> pid_t {
 
 #[no_mangle]
 pub extern "C" fn write(fildes: c_int, buf: *const c_void, nbyte: size_t) -> ssize_t {
-    unimplemented!();
+    use core::slice;
+
+    let buf = unsafe { slice::from_raw_parts(buf as *const u8, nbyte as usize) };
+    platform::write(fildes, buf)
 }
 
 /*