mirror of
https://github.com/NotAShelf/microfetch.git
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crates: make assembly helpers no_std
Signed-off-by: NotAShelf <raf@notashelf.dev> Change-Id: I1af24924f436b3f552b67f54bad2c02a6a6a6964
This commit is contained in:
parent
325bc7ab5a
commit
1b0e3070bb
GPG key ID:
29D95B64378DB4BF
3 changed files with 32 additions and 29 deletions
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@ -7,7 +7,7 @@
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//!
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//! Supports `x86_64`, `aarch64`, and `riscv64` architectures.
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use std::io;
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#![no_std]
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// Ensure we're compiling for a supported architecture.
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#[cfg(not(any(
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@ -37,7 +37,7 @@ pub unsafe fn sys_open(path: *const u8, flags: i32) -> i32 {
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#[cfg(target_arch = "x86_64")]
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unsafe {
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let fd: i64;
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std::arch::asm!(
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core::arch::asm!(
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"syscall",
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in("rax") 2i64, // SYS_open
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in("rdi") path,
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@ -56,7 +56,7 @@ pub unsafe fn sys_open(path: *const u8, flags: i32) -> i32 {
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#[cfg(target_arch = "aarch64")]
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unsafe {
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let fd: i64;
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std::arch::asm!(
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core::arch::asm!(
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"svc #0",
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in("x8") 56i64, // SYS_openat
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in("x0") -100i32, // AT_FDCWD
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@ -74,7 +74,7 @@ pub unsafe fn sys_open(path: *const u8, flags: i32) -> i32 {
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#[cfg(target_arch = "riscv64")]
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unsafe {
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let fd: i64;
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std::arch::asm!(
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core::arch::asm!(
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"ecall",
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in("a7") 56i64, // SYS_openat
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in("a0") -100i32, // AT_FDCWD
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@ -109,7 +109,7 @@ pub unsafe fn sys_read(fd: i32, buf: *mut u8, count: usize) -> isize {
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#[cfg(target_arch = "x86_64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"syscall",
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in("rax") 0i64, // SYS_read
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in("rdi") fd,
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@ -130,7 +130,7 @@ pub unsafe fn sys_read(fd: i32, buf: *mut u8, count: usize) -> isize {
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#[cfg(target_arch = "aarch64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"svc #0",
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in("x8") 63i64, // SYS_read
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in("x0") fd,
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@ -149,7 +149,7 @@ pub unsafe fn sys_read(fd: i32, buf: *mut u8, count: usize) -> isize {
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#[cfg(target_arch = "riscv64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"ecall",
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in("a7") 63i64, // SYS_read
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in("a0") fd,
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@ -184,7 +184,7 @@ pub unsafe fn sys_write(fd: i32, buf: *const u8, count: usize) -> isize {
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#[cfg(target_arch = "x86_64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"syscall",
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in("rax") 1i64, // SYS_write
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in("rdi") fd,
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@ -205,7 +205,7 @@ pub unsafe fn sys_write(fd: i32, buf: *const u8, count: usize) -> isize {
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#[cfg(target_arch = "aarch64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"svc #0",
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in("x8") 64i64, // SYS_write
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in("x0") fd,
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@ -224,7 +224,7 @@ pub unsafe fn sys_write(fd: i32, buf: *const u8, count: usize) -> isize {
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#[cfg(target_arch = "riscv64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"ecall",
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in("a7") 64i64, // SYS_write
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in("a0") fd,
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@ -252,7 +252,7 @@ pub unsafe fn sys_close(fd: i32) -> i32 {
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#[cfg(target_arch = "x86_64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"syscall",
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in("rax") 3i64, // SYS_close
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in("rdi") fd,
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@ -270,7 +270,7 @@ pub unsafe fn sys_close(fd: i32) -> i32 {
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#[cfg(target_arch = "aarch64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"svc #0",
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in("x8") 57i64, // SYS_close
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in("x0") fd,
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@ -286,7 +286,7 @@ pub unsafe fn sys_close(fd: i32) -> i32 {
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#[cfg(target_arch = "riscv64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"ecall",
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in("a7") 57i64, // SYS_close
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in("a0") fd,
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@ -331,7 +331,7 @@ pub unsafe fn sys_uname(buf: *mut UtsNameBuf) -> i32 {
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#[cfg(target_arch = "x86_64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"syscall",
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in("rax") 63i64, // SYS_uname
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in("rdi") buf,
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@ -350,7 +350,7 @@ pub unsafe fn sys_uname(buf: *mut UtsNameBuf) -> i32 {
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#[cfg(target_arch = "aarch64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"svc #0",
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in("x8") 160i64, // SYS_uname
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in("x0") buf,
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@ -366,7 +366,7 @@ pub unsafe fn sys_uname(buf: *mut UtsNameBuf) -> i32 {
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#[cfg(target_arch = "riscv64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"ecall",
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in("a7") 160i64, // SYS_uname
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in("a0") buf,
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@ -421,7 +421,7 @@ pub unsafe fn sys_statfs(path: *const u8, buf: *mut StatfsBuf) -> i32 {
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#[cfg(target_arch = "x86_64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"syscall",
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in("rax") 137i64, // SYS_statfs
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in("rdi") path,
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@ -441,7 +441,7 @@ pub unsafe fn sys_statfs(path: *const u8, buf: *mut StatfsBuf) -> i32 {
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#[cfg(target_arch = "aarch64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"svc #0",
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in("x8") 43i64, // SYS_statfs
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in("x0") path,
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@ -459,7 +459,7 @@ pub unsafe fn sys_statfs(path: *const u8, buf: *mut StatfsBuf) -> i32 {
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#[cfg(target_arch = "riscv64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"ecall",
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in("a7") 43i64, // SYS_statfs
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in("a0") path,
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@ -480,16 +480,17 @@ pub unsafe fn sys_statfs(path: *const u8, buf: *mut StatfsBuf) -> i32 {
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///
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/// # Errors
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///
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/// Returns an error if the file cannot be opened or read
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/// Returns an error if the file cannot be opened or read. The error value is
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/// the negated errno.
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#[inline]
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pub fn read_file_fast(path: &str, buffer: &mut [u8]) -> io::Result<usize> {
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pub fn read_file_fast(path: &str, buffer: &mut [u8]) -> Result<usize, i32> {
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const O_RDONLY: i32 = 0;
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// We use stack-allocated buffer for null-terminated path. The maximum
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// is 256 bytes.
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let path_bytes = path.as_bytes();
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if path_bytes.len() >= 256 {
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return Err(io::Error::new(io::ErrorKind::InvalidInput, "Path too long"));
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return Err(-22); // EINVAL
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}
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let mut path_buf = [0u8; 256];
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@ -499,14 +500,14 @@ pub fn read_file_fast(path: &str, buffer: &mut [u8]) -> io::Result<usize> {
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unsafe {
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let fd = sys_open(path_buf.as_ptr(), O_RDONLY);
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if fd < 0 {
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return Err(io::Error::last_os_error());
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return Err(fd);
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}
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let bytes_read = sys_read(fd, buffer.as_mut_ptr(), buffer.len());
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let _ = sys_close(fd);
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if bytes_read < 0 {
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return Err(io::Error::last_os_error());
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return Err(bytes_read as i32);
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}
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#[allow(clippy::cast_sign_loss)]
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@ -559,7 +560,7 @@ pub unsafe fn sys_sysinfo(info: *mut SysInfo) -> i64 {
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#[cfg(target_arch = "x86_64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"syscall",
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in("rax") 99_i64, // __NR_sysinfo
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in("rdi") info,
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@ -574,7 +575,7 @@ pub unsafe fn sys_sysinfo(info: *mut SysInfo) -> i64 {
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#[cfg(target_arch = "aarch64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"svc #0",
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in("x8") 179_i64, // __NR_sysinfo
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in("x0") info,
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@ -587,7 +588,7 @@ pub unsafe fn sys_sysinfo(info: *mut SysInfo) -> i64 {
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#[cfg(target_arch = "riscv64")]
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unsafe {
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let ret: i64;
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std::arch::asm!(
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core::arch::asm!(
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"ecall",
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in("a7") 179_i64, // __NR_sysinfo
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in("a0") info,
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