libc: add openlibm, hide compiler_builtins in static lib

test.c

@@ -1,13 +1,11 @@
-#include <unistd.h>
-#include <stdio.h>
-#include <string.h>
 #include <assert.h>
-#include <stdlib.h>
-#include <fcntl.h>
+#include <stdio.h>
+#include <math.h>
 
 int main(int argc, const char **argv) {
-    int x = 1234;
-    printf("Hello %d!!!\n", x);
-
+    double x = round(1234.123);
+    assert(fabs(x - 1234.000) < 0.00001);
+    double y = round(1234.5678);
+    assert(fabs(y - 1235.000) < 0.00001);
     return 0;
 }

userspace/lib/ygglibc/build.rs

@@ -65,14 +65,13 @@ fn compile_crt0(arch: &str, output_dir: impl AsRef<Path>) {
     command
         .arg(format!("--target={}-unknown-none", arch))
         .arg("-nostdlib")
-        .arg("-nostdinc")
         .arg("-c")
         .arg("-o")
         .arg(output_dir.join("crt0.o"))
-        .arg(format!("crt/{}/crt0.S", arch));
+        .arg(format!("crt/{}/crt0.c", arch));
 
     if !command.status().unwrap().success() {
-        panic!("Couldn't compile crt0.S");
+        panic!("Couldn't compile crt0.o");
     }
 }
 

userspace/lib/ygglibc/crt/x86_64/crt0.S

@@ -1,11 +0,0 @@
-.section .text
-
-.global _start
-.extern __ygglibc_entry
-
-.type _start, %function
-_start:
-    // %rdi -- kernel argument
-    leaq __ygglibc_entry(%rip), %rax
-    jmp *%rax
-.size _start, . - _start

userspace/lib/ygglibc/crt/x86_64/crt0.c

@@ -0,0 +1,15 @@
+#include <stddef.h>
+
+extern __attribute__((noreturn)) void __ygglibc_entry(const void *);
+
+// // rust's shlib export breaks memset symbol
+// void *memset(void *dst, int val, size_t len) __attribute__((weak)) {
+//     for (size_t i = 0; i < len; ++i) {
+//         ((char *) dst)[i] = (char) val;
+//     }
+//     return dst;
+// }
+
+[[noreturn]] void _start(const void *arg) {
+    __ygglibc_entry(arg);
+}

userspace/lib/ygglibc/etc/x86_64-unknown-none.json

@@ -7,7 +7,7 @@
   "data-layout": "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128",
   "max-atomic-width": 64,
   "target-pointer-width": "64",
-  "features": "-avx,-sse,+soft-float",
+  "features": "+sse",
 
   "disable-redzone": true,
   "executables": true,
@@ -22,6 +22,11 @@
   "linker": "rust-lld",
   "linker-flavor": "ld.lld",
 
+  "late-link-args-static": {
+    "ld.lld": [
+        "--gc-sections"
+    ]
+  },
   "late-link-args-dynamic": {
     "ld.lld": [
       "--dynamic-linker=/libexec/dyn-loader"

userspace/lib/ygglibc/include/math.h

@@ -0,0 +1,20 @@
+#include <openlibm_math.h>
+
+typedef float float_t;
+typedef double double_t;
+
+#ifndef M_PI
+#define	M_PI		3.14159265358979323846	/* pi */
+#endif
+
+#ifndef M_PI_2
+#define	M_PI_2		1.57079632679489661923	/* pi/2 */
+#endif
+
+#ifndef M_PI_4
+#define	M_PI_4		0.78539816339744830962	/* pi/4 */
+#endif
+
+#ifndef M_2_PI
+#define M_2_PI		0.63661977236758134308	/* 2/pi */
+#endif

userspace/lib/ygglibc/src/allocator.rs

@@ -7,13 +7,7 @@ use core::{
 use libyalloc::{allocator::BucketAllocator, sys::PageProvider};
 use yggdrasil_rt::{mem::MappingSource, sys as syscall};
 
-use crate::{
-    error::EResult,
-    headers::{
-        errno,
-        string::{memcpy, memset},
-    }, sync::Mutex,
-};
+use crate::{error::EResult, headers::{errno, string::mem::{memcpy, memset}}, sync::Mutex};
 
 struct Allocator;
 struct PageProviderImpl;

userspace/lib/ygglibc/src/headers/ctype/mod.rs

@@ -1,4 +1,4 @@
-use core::ffi::c_int;
+use core::ffi::{c_int, c_short};
 
 use super::locale::locale_t;
 
@@ -159,3 +159,8 @@ unsafe extern "C" fn tolower_l(_ch: c_int, _locale: locale_t) -> c_int {
 unsafe extern "C" fn toupper_l(_ch: c_int, _locale: locale_t) -> c_int {
     unimplemented!()
 }
+
+#[no_mangle]
+unsafe extern "C" fn __ctype_b_loc() -> *mut *mut c_short {
+    todo!()
+}

userspace/lib/ygglibc/src/headers/string/mem.rs

@@ -1,5 +1,7 @@
-
-use core::{ffi::{c_int, c_void}, ptr::null_mut};
+use core::{
+    ffi::{c_int, c_void},
+    ptr::null_mut,
+};
 
 #[no_mangle]
 unsafe extern "C" fn memccpy(
@@ -69,3 +71,23 @@ pub(super) unsafe extern "C" fn mempcpy(
     }
     dst.add(n) as _
 }
+
+#[no_mangle]
+pub unsafe extern "C" fn memset(dst: *mut c_void, val: c_int, n: usize) -> *mut c_void {
+    compiler_builtins::mem::memset(dst.cast(), val, n).cast()
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn memcpy(dst: *mut c_void, src: *const c_void, n: usize) -> *mut c_void {
+    compiler_builtins::mem::memcpy(dst.cast(), src.cast(), n).cast()
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn memmove(dst: *mut c_void, src: *const c_void, n: usize) -> *mut c_void {
+    compiler_builtins::mem::memmove(dst.cast(), src.cast(), n).cast()
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn memcmp(s1: *const c_void, s2: *const c_void, n: usize) -> c_int {
+    compiler_builtins::mem::memcmp(s1.cast(), s2.cast(), n)
+}

userspace/lib/ygglibc/src/headers/string/mod.rs

@@ -2,9 +2,3 @@ use core::ffi::{c_char, c_int, c_void};
 
 pub mod mem;
 pub mod str;
-
-extern "C" {
-    pub fn strlen(s: *const c_char) -> usize;
-    pub fn memset(a: *mut c_void, c: c_int, n: usize) -> *mut c_void;
-    pub fn memcpy(dst: *mut c_void, src: *const c_void, n: usize) -> *mut c_void;
-}

userspace/lib/ygglibc/src/headers/string/str.rs

@@ -13,7 +13,7 @@ use crate::{
     },
 };
 
-use super::{mem::mempcpy, memcpy, memset, strlen};
+use super::mem::{memcpy, mempcpy, memset};
 
 #[no_mangle]
 unsafe extern "C" fn stpcpy(dst: *mut c_char, src: *const c_char) -> *mut c_char {
@@ -120,6 +120,11 @@ unsafe extern "C" fn strerror_r(e: c_int, buf: *mut c_char, n: usize) -> *mut c_
     strncpy(buf, source, n)
 }
 
+#[no_mangle]
+unsafe extern "C" fn strlen(s: *const c_char) -> usize {
+    compiler_builtins::mem::strlen(s.cast())
+}
+
 #[no_mangle]
 unsafe extern "C" fn strncat(dst: *mut c_char, src: *const c_char, n: usize) -> *mut c_char {
     if dst.is_null() || src.is_null() {
@@ -336,6 +341,11 @@ unsafe extern "C" fn strxfrm(_a: *mut c_char, _b: *const c_char, _n: usize) -> u
 }
 
 #[no_mangle]
-unsafe extern "C" fn strxfrm_l(_a: *mut c_char, _b: *const c_char, _n: usize, _l: locale_t) -> usize {
+unsafe extern "C" fn strxfrm_l(
+    _a: *mut c_char,
+    _b: *const c_char,
+    _n: usize,
+    _l: locale_t,
+) -> usize {
     unimplemented!()
 }

userspace/lib/ygglibc/src/lib.rs

@@ -6,13 +6,17 @@
     c_variadic,
     arbitrary_self_types_pointers,
     maybe_uninit_slice,
-    slice_internals
+    slice_internals,
+    linkage,
+    rustc_private
 )]
 #![allow(internal_features)]
 #![cfg_attr(not(test), no_std)]
 
 extern crate alloc;
 
+extern crate compiler_builtins;
+
 #[cfg(test)]
 extern crate std;
 

xtask/src/build/c.rs

@@ -0,0 +1,186 @@
+use std::{
+    fs,
+    path::{Path, PathBuf},
+    process::Command,
+};
+
+use crate::{env::BuildEnv, error::Error, util};
+
+use super::cargo::CargoBuilder;
+
+pub struct Llvm {
+    root: PathBuf,
+}
+
+pub struct Ygglibc {
+    static_lib_file: PathBuf,
+    shared_lib_file: PathBuf,
+    crt0_file: PathBuf,
+    include_paths: Vec<PathBuf>,
+}
+
+pub struct Openlibm {
+    shared_lib_file: PathBuf,
+    static_lib_file: PathBuf,
+    include_path: PathBuf,
+}
+
+impl Llvm {
+    pub fn c_clang(&self, env: &BuildEnv) -> Command {
+        let mut command = Command::new(self.root.join("bin/clang"));
+        command.arg(format!("--target={}-unknown-yggdrasil", env.arch.name()));
+        command.arg(format!("--sysroot={}", env.llvm_sysroot.display()));
+        command
+    }
+
+    pub fn clang(&self) -> PathBuf {
+        self.root.join("bin/clang")
+    }
+}
+
+fn build_test_c_program(
+    env: &BuildEnv,
+    llvm: &Llvm,
+    install: &mut Vec<(PathBuf, PathBuf)>,
+) -> Result<(), Error> {
+    log::info!("Building a test C program");
+    let target_dir = &env.userspace_output_dir;
+
+    let mut command = llvm.c_clang(env);
+    command
+        .args([
+            "-Bdynamic",
+            "-fpie",
+            "-O0",
+            "-ggdb",
+            "-lm",
+            "-fstack-protector-strong",
+        ])
+        .arg("-o")
+        .arg(target_dir.join("c-test"))
+        .arg(env.workspace_root.join("test.c"));
+
+    if !command.status()?.success() {
+        return Err(Error::ExternalCommandFailed);
+    }
+
+    let mut command = llvm.c_clang(env);
+    command
+        .args(["-static", "-O0", "-ggdb", "-fstack-protector-strong", "-lm"])
+        .arg("-o")
+        .arg(target_dir.join("c-test-static"))
+        .arg(env.workspace_root.join("test.c"));
+
+    if !command.status()?.success() {
+        return Err(Error::ExternalCommandFailed);
+    }
+
+    install.push((target_dir.join("c-test"), "c-test".into()));
+    install.push((target_dir.join("c-test-static"), "c-test-static".into()));
+
+    Ok(())
+}
+
+fn install_ygglibc(env: &BuildEnv, ygglibc: &Ygglibc) -> Result<(), Error> {
+    log::info!("Installing ygglibc into LLVM sysroot");
+
+    let dst_lib_dir = env.llvm_sysroot.join("lib");
+    let dst_include_dir = env.llvm_sysroot.join("usr/include");
+
+    fs::create_dir_all(&dst_lib_dir)?;
+    fs::create_dir_all(&dst_include_dir)?;
+
+    fs::copy(&ygglibc.static_lib_file, dst_lib_dir.join("libygglibc.a"))?;
+    fs::copy(&ygglibc.shared_lib_file, dst_lib_dir.join("libygglibc.so"))?;
+    fs::copy(&ygglibc.crt0_file, dst_lib_dir.join("crt0.o"))?;
+
+    for path in ygglibc.include_paths.iter() {
+        util::copy_dir_recursive(path, &dst_include_dir)?;
+    }
+
+    Ok(())
+}
+
+fn build_ygglibc(env: &BuildEnv) -> Result<Ygglibc, Error> {
+    let ygglibc_dir = env.workspace_root.join("userspace/lib/ygglibc");
+    let target_dir = ygglibc_dir.join(format!(
+        "target/{}-unknown-none/{}",
+        env.arch.name(),
+        env.profile.dir()
+    ));
+    CargoBuilder::Ygglibc(env).build(&ygglibc_dir)?;
+
+    let static_lib_file = target_dir.join("libygglibc.a");
+    let shared_lib_file = target_dir.join("libygglibc.so");
+    let crt0_file = target_dir.join("crt0.o");
+    let generated_includes = target_dir.join("include");
+    let static_includes = ygglibc_dir.join("include");
+
+    Ok(Ygglibc {
+        static_lib_file,
+        shared_lib_file,
+        crt0_file,
+        include_paths: vec![generated_includes, static_includes],
+    })
+}
+
+// TODO clone openlibm
+fn build_openlibm(env: &BuildEnv, llvm: &Llvm) -> Result<Openlibm, Error> {
+    fn make(env: &BuildEnv, llvm: &Llvm, libm_path: &Path) -> Command {
+        let mut command = Command::new("make");
+        command.env("SYSROOT", &env.llvm_sysroot);
+        command.env("ARCH", env.arch.name());
+        command.env("TRIPLE", format!("{}-unknown-yggdrasil", env.arch.name()));
+        command.env("USEGCC", "0");
+        command.env("USECLANG", "1");
+        command.env("CC", llvm.clang());
+        command.current_dir(&libm_path);
+        command
+    }
+
+    log::info!("Building openlibm");
+
+    let libm_path = env.workspace_root.join("toolchain-c/libs/openlibm");
+
+    let mut command = make(env, llvm, &libm_path);
+    if !command.status()?.success() {
+        return Err(Error::ExternalCommandFailed);
+    }
+
+    Ok(Openlibm {
+        shared_lib_file: libm_path.join("libopenlibm.so.4.0"),
+        static_lib_file: libm_path.join("libopenlibm.a"),
+        include_path: libm_path.join("include"),
+    })
+}
+
+fn install_openlibm(env: &BuildEnv, libm: &Openlibm) -> Result<(), Error> {
+    fs::copy(&libm.static_lib_file, env.llvm_sysroot.join("lib/libm.a"))?;
+    fs::copy(&libm.shared_lib_file, env.llvm_sysroot.join("lib/libm.so"))?;
+
+    util::copy_dir_recursive(&libm.include_path, env.llvm_sysroot.join("usr/include"))?;
+
+    Ok(())
+}
+
+fn build_llvm(env: &BuildEnv) -> Result<Llvm, Error> {
+    // TODO actually build and install LLVM
+    Ok(Llvm {
+        root: env.workspace_root.join("toolchain-c/prefix/host"),
+    })
+}
+
+pub fn build_c(env: &BuildEnv, install: &mut Vec<(PathBuf, PathBuf)>) -> Result<(), Error> {
+    let llvm = build_llvm(env)?;
+    let ygglibc = build_ygglibc(env)?;
+    install_ygglibc(env, &ygglibc)?;
+    let libm = build_openlibm(env, &llvm)?;
+    install_openlibm(env, &libm)?;
+
+    build_test_c_program(env, &llvm, install)?;
+
+    install.push((ygglibc.shared_lib_file, "lib/libygglibc.so".into()));
+    install.push((libm.shared_lib_file, "lib/libopenlibm.so.4".into()));
+
+    Ok(())
+}

xtask/src/build/cargo.rs

@@ -90,7 +90,8 @@ impl<'e> CargoBuilder<'e> {
 
                 command
                     .arg(arg)
-                    .arg("-Zbuild-std=core,alloc,compiler_builtins")
+                    .arg("-Zbuild-std=core,alloc")
+                    .arg("-Zbuild-std-features=compiler-builtins-mangled-names,compiler-builtins-mem")
                     .arg(&format!("--target={target}"));
 
                 if env.verbose {

xtask/src/build/llvm.rs

@@ -1,23 +0,0 @@
-use std::{path::PathBuf, process::Command};
-
-use crate::{env::BuildEnv, error::Error};
-
-pub struct Llvm {
-    root: PathBuf,
-}
-
-impl Llvm {
-    pub fn c_clang(&self, env: &BuildEnv) -> Command {
-        let mut command = Command::new(self.root.join("bin/clang"));
-        command.arg(format!("--target={}-unknown-yggdrasil", env.arch.name()));
-        command.arg(format!("--sysroot={}", env.llvm_sysroot.display()));
-        command
-    }
-}
-
-pub fn build_llvm(env: &BuildEnv) -> Result<Llvm, Error> {
-    // TODO actually build and install LLVM
-    Ok(Llvm {
-        root: env.workspace_root.join("toolchain-c/prefix/host"),
-    })
-}

xtask/src/build/mod.rs

@@ -13,8 +13,8 @@ use crate::{
 pub mod i686;
 pub mod x86_64;
 
+pub mod c;
 mod cargo;
-pub mod llvm;
 mod module;
 pub mod toolchain;
 mod userspace;

xtask/src/build/userspace.rs

@@ -7,21 +7,14 @@ use std::{
 use walkdir::WalkDir;
 
 use crate::{
-    build::{cargo::CargoBuilder, llvm},
+    build::{c, cargo::CargoBuilder},
     check::AllOk,
     env::BuildEnv,
     error::Error,
     util,
 };
 
-use super::{llvm::Llvm, InitrdGenerated};
-
-pub struct Ygglibc {
-    static_lib_file: PathBuf,
-    shared_lib_file: PathBuf,
-    crt0_file: PathBuf,
-    include_paths: Vec<PathBuf>,
-}
+use super::InitrdGenerated;
 
 const PROGRAMS: &[(&str, &str)] = &[
     // init
@@ -73,102 +66,22 @@ const PROGRAMS: &[(&str, &str)] = &[
     ("c-test-static", "c-test-static"),
 ];
 
-fn build_test_c_program(env: &BuildEnv, llvm: &Llvm) -> Result<(), Error> {
-    log::info!("Building a test C program");
-    let target_dir = &env.userspace_output_dir;
-
-    let mut command = llvm.c_clang(env);
-    command
-        .args([
-            "-v",
-            "-Bdynamic",
-            "-fpie",
-            "-O0",
-            "-ggdb",
-            "-fstack-protector-strong",
-        ])
-        .arg("-o")
-        .arg(target_dir.join("c-test"))
-        .arg(env.workspace_root.join("test.c"));
-
-    if !command.status()?.success() {
-        return Err(Error::ExternalCommandFailed);
-    }
-
-    let mut command = llvm.c_clang(env);
-    command
-        .args(["-v", "-static", "-O0", "-ggdb", "-fstack-protector-strong"])
-        .arg("-o")
-        .arg(target_dir.join("c-test-static"))
-        .arg(env.workspace_root.join("test.c"));
-
-    if !command.status()?.success() {
-        return Err(Error::ExternalCommandFailed);
-    }
-
-    Ok(())
-}
-
-fn install_ygglibc(env: &BuildEnv, ygglibc: &Ygglibc) -> Result<(), Error> {
-    log::info!("Installing ygglibc into LLVM sysroot");
-
-    let dst_lib_dir = env.llvm_sysroot.join("lib");
-    let dst_include_dir = env.llvm_sysroot.join("usr/include");
-
-    fs::create_dir_all(&dst_lib_dir)?;
-    fs::create_dir_all(&dst_include_dir)?;
-
-    fs::copy(&ygglibc.static_lib_file, dst_lib_dir.join("libygglibc.a"))?;
-    fs::copy(&ygglibc.shared_lib_file, dst_lib_dir.join("libygglibc.so"))?;
-    fs::copy(&ygglibc.crt0_file, dst_lib_dir.join("crt0.o"))?;
-
-    for path in ygglibc.include_paths.iter() {
-        util::copy_dir_recursive(path, &dst_include_dir)?;
-    }
-
-    Ok(())
-}
-
-fn build_ygglibc(env: &BuildEnv) -> Result<Ygglibc, Error> {
-    let ygglibc_dir = env.workspace_root.join("userspace/lib/ygglibc");
-    let target_dir = ygglibc_dir.join(format!(
-        "target/{}-unknown-none/{}",
-        env.arch.name(),
-        env.profile.dir()
-    ));
-    CargoBuilder::Ygglibc(env).build(&ygglibc_dir)?;
-
-    let static_lib_file = target_dir.join("libygglibc.a");
-    let shared_lib_file = target_dir.join("libygglibc.so");
-    let crt0_file = target_dir.join("crt0.o");
-    let generated_includes = target_dir.join("include");
-    let static_includes = ygglibc_dir.join("include");
-
-    Ok(Ygglibc {
-        static_lib_file,
-        shared_lib_file,
-        crt0_file,
-        include_paths: vec![generated_includes, static_includes],
-    })
-}
-
-fn build_userspace(env: &BuildEnv, _: AllOk) -> Result<Ygglibc, Error> {
+fn build_userspace(
+    env: &BuildEnv,
+    extra: &mut Vec<(PathBuf, PathBuf)>,
+    _: AllOk,
+) -> Result<(), Error> {
     log::info!("Building userspace");
     CargoBuilder::Userspace(env).build(env.workspace_root.join("userspace"))?;
     CargoBuilder::Userspace(env).build(env.workspace_root.join("userspace/dynload-program"))?;
+    c::build_c(env, extra)?;
 
-    let ygglibc = build_ygglibc(env)?;
-    let llvm = llvm::build_llvm(env)?;
-    install_ygglibc(env, &ygglibc)?;
-    build_test_c_program(env, &llvm)?;
-
-    Ok(ygglibc)
+    Ok(())
 }
 
 fn build_rootfs<S: AsRef<Path>, D: AsRef<Path>>(
     env: &BuildEnv,
     install_extra: Vec<(PathBuf, PathBuf)>,
-    ygglibc: &Ygglibc,
     build_dir: S,
     rootfs_dir: D,
     _: AllOk,
@@ -218,11 +131,6 @@ fn build_rootfs<S: AsRef<Path>, D: AsRef<Path>>(
 
     log::info!("Installing ygglibc");
 
-    util::copy_file(
-        &ygglibc.shared_lib_file,
-        rootfs_dir.join("lib/libygglibc.so"),
-    )?;
-
     log::info!("Installing extras");
     for (src, dst) in install_extra {
         util::copy_file(src, rootfs_dir.join(dst))?;
@@ -281,16 +189,16 @@ fn pack_initrd<P: AsRef<Path>>(env: &BuildEnv, rootfs_dir: P) -> Result<InitrdGe
 
 pub fn build_initrd(
     env: &BuildEnv,
-    install_extra: Vec<(PathBuf, PathBuf)>,
+    mut install_extra: Vec<(PathBuf, PathBuf)>,
     check: AllOk,
 ) -> Result<InitrdGenerated, Error> {
     let rootfs_dir = env.userspace_output_dir.join("rootfs");
 
-    let ygglibc = build_userspace(env, check)?;
+    build_userspace(env, &mut install_extra, check)?;
+
     build_rootfs(
         env,
         install_extra,
-        &ygglibc,
         &env.userspace_output_dir,
         &rootfs_dir,
         check,

xtask/src/check.rs

@@ -41,6 +41,7 @@ fn check_commands_x86_64() -> Result<CommandsOk, Error> {
         ("mtools", "Install the `mtools` package"),
         ("mkfs.vfat", "Install the `dosfstools` package"),
         ("ld64.lld", "Install LLVM"),
+        ("cmake", "Install cmake"),
     ])
 }