mirror of
https://github.com/NotAShelf/microfetch.git
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arch: add powerpc32 support
This commit is contained in:
Amaan Qureshi
parent
a6fab02586
commit
7bbc47eb9f
4 changed files with 225 additions and 7 deletions
3
.github/workflows/rust.yml
vendored
3
.github/workflows/rust.yml
vendored
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@ -49,6 +49,9 @@ jobs:
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build_std: true
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- target: i686-unknown-linux-gnu
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toolchain: stable
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# powerpc uses experimental asm features
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- target: powerpc-unknown-linux-gnu
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toolchain: nightly
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steps:
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- name: "Checkout"
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@ -6,13 +6,14 @@
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//! faster?
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//!
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//! Supports `x86_64`, `aarch64`, `riscv64`, `loongarch64`, `s390x`,
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//! `powerpc64`, `arm` (armv7), `riscv32`, `sparc64`, `mips64`, and `x86`
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//! (i686) architectures.
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//! `powerpc64`, `arm` (armv7), `riscv32`, `sparc64`, `mips64`, `x86` (i686),
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//! and `powerpc` (ppc32) architectures.
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#![no_std]
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#![cfg_attr(
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any(
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target_arch = "powerpc64",
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target_arch = "powerpc",
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target_arch = "sparc64",
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target_arch = "mips64"
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),
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@ -31,11 +32,13 @@
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target_arch = "riscv32",
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target_arch = "sparc64",
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target_arch = "mips64",
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target_arch = "x86"
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target_arch = "x86",
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target_arch = "powerpc"
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)))]
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compile_error!(
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"Unsupported architecture: only x86_64, aarch64, riscv64, loongarch64, \
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s390x, powerpc64, arm, riscv32, sparc64, mips64, and x86 are supported"
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s390x, powerpc64, arm, riscv32, sparc64, mips64, x86, and powerpc are \
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supported"
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);
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// Per-arch syscall implementations live in their own module files.
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@ -72,6 +75,9 @@ mod arch;
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#[cfg(target_arch = "x86")]
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#[path = "x86.rs"]
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mod arch;
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#[cfg(target_arch = "powerpc")]
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#[path = "powerpc.rs"]
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mod arch;
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/// Copies `n` bytes from `src` to `dest`.
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///
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@ -310,6 +316,7 @@ pub unsafe fn sys_uname(buf: *mut UtsNameBuf) -> i32 {
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target_arch = "arm",
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target_arch = "riscv32",
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target_arch = "x86",
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target_arch = "powerpc",
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target_arch = "mips64"
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)))]
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pub struct StatfsBuf {
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@ -352,7 +359,12 @@ pub struct StatfsBuf {
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/// on armv7 `statfs64(2)` has 32-bit word fields; see
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/// https://github.com/torvalds/linux/blob/v6.19/include/uapi/asm-generic/statfs.h
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#[repr(C)]
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#[cfg(any(target_arch = "arm", target_arch = "riscv32", target_arch = "x86"))]
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#[cfg(any(
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target_arch = "arm",
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target_arch = "riscv32",
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target_arch = "x86",
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target_arch = "powerpc"
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))]
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pub struct StatfsBuf {
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pub f_type: u32,
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pub f_bsize: u32,
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@ -463,7 +475,8 @@ pub fn read_file_fast(path: &str, buffer: &mut [u8]) -> Result<usize, i32> {
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#[cfg(not(any(
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target_arch = "arm",
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target_arch = "riscv32",
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target_arch = "x86"
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target_arch = "x86",
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target_arch = "powerpc"
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)))]
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pub struct SysInfo {
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pub uptime: i64,
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@ -488,7 +501,12 @@ pub struct SysInfo {
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/// on armv7 `__kernel_long_t` is 4 bytes; see
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/// https://github.com/torvalds/linux/blob/v6.19/include/uapi/linux/sysinfo.h
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#[repr(C)]
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#[cfg(any(target_arch = "arm", target_arch = "riscv32", target_arch = "x86"))]
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#[cfg(any(
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target_arch = "arm",
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target_arch = "riscv32",
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target_arch = "x86",
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target_arch = "powerpc"
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))]
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pub struct SysInfo {
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pub uptime: i32,
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pub loads: [u32; 3],
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180
crates/asm/src/powerpc.rs
Normal file
180
crates/asm/src/powerpc.rs
Normal file
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@ -0,0 +1,180 @@
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//! Syscall implementations for `powerpc`.
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use super::{StatfsBuf, SysInfo, UtsNameBuf};
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pub(super) unsafe fn sys_open(path: *const u8, flags: i32) -> i32 {
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unsafe {
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let ret: i32;
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core::arch::asm!(
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"sc",
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"bns+ 2f",
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"neg 3, 3",
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"2:",
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inlateout("r0") 5i32 => _, // SYS_open
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inlateout("r3") path => ret,
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inlateout("r4") flags => _,
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inlateout("r5") 0i32 => _,
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out("r6") _, out("r7") _, out("r8") _,
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out("r9") _, out("r10") _, out("r11") _, out("r12") _,
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out("cr0") _,
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options(nostack)
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);
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ret
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}
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}
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pub(super) unsafe fn sys_read(fd: i32, buf: *mut u8, count: usize) -> isize {
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unsafe {
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let ret: i32;
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core::arch::asm!(
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"sc",
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"bns+ 2f",
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"neg 3, 3",
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"2:",
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inlateout("r0") 3i32 => _, // SYS_read
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inlateout("r3") fd => ret,
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inlateout("r4") buf => _,
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inlateout("r5") count => _,
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out("r6") _, out("r7") _, out("r8") _,
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out("r9") _, out("r10") _, out("r11") _, out("r12") _,
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out("cr0") _,
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options(nostack)
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);
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ret as isize
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}
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}
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pub(super) unsafe fn sys_write(fd: i32, buf: *const u8, count: usize) -> isize {
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unsafe {
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let ret: i32;
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core::arch::asm!(
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"sc",
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"bns+ 2f",
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"neg 3, 3",
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"2:",
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inlateout("r0") 4i32 => _, // SYS_write
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inlateout("r3") fd => ret,
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inlateout("r4") buf => _,
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inlateout("r5") count => _,
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out("r6") _, out("r7") _, out("r8") _,
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out("r9") _, out("r10") _, out("r11") _, out("r12") _,
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out("cr0") _,
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options(nostack)
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);
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ret as isize
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}
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}
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pub(super) unsafe fn sys_close(fd: i32) -> i32 {
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unsafe {
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let ret: i32;
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core::arch::asm!(
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"sc",
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"bns+ 2f",
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"neg 3, 3",
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"2:",
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inlateout("r0") 6i32 => _, // SYS_close
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inlateout("r3") fd => ret,
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out("r4") _, out("r5") _, out("r6") _, out("r7") _, out("r8") _,
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out("r9") _, out("r10") _, out("r11") _, out("r12") _,
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out("cr0") _,
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options(nostack)
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);
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ret
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}
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}
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pub(super) unsafe fn sys_uname(buf: *mut UtsNameBuf) -> i32 {
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unsafe {
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let ret: i32;
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core::arch::asm!(
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"sc",
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"bns+ 2f",
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"neg 3, 3",
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"2:",
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inlateout("r0") 122i32 => _, // SYS_newuname
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inlateout("r3") buf => ret,
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out("r4") _, out("r5") _, out("r6") _, out("r7") _, out("r8") _,
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out("r9") _, out("r10") _, out("r11") _, out("r12") _,
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out("cr0") _,
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options(nostack)
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);
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ret
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}
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}
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pub(super) unsafe fn sys_statfs(path: *const u8, buf: *mut StatfsBuf) -> i32 {
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unsafe {
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let ret: i32;
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core::arch::asm!(
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"sc",
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"bns+ 2f",
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"neg 3, 3",
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"2:",
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inlateout("r0") 252i32 => _, // SYS_statfs64
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inlateout("r3") path => ret,
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inlateout("r4") core::mem::size_of::<StatfsBuf>() => _,
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inlateout("r5") buf => _,
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out("r6") _, out("r7") _, out("r8") _,
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out("r9") _, out("r10") _, out("r11") _, out("r12") _,
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out("cr0") _,
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options(nostack)
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);
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ret
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}
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}
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pub(super) unsafe fn sys_sysinfo(info: *mut SysInfo) -> i64 {
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unsafe {
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let ret: i32;
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core::arch::asm!(
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"sc",
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"bns+ 2f",
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"neg 3, 3",
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"2:",
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inlateout("r0") 116_i32 => _, // __NR_sysinfo
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inlateout("r3") info => ret,
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out("r4") _, out("r5") _, out("r6") _, out("r7") _, out("r8") _,
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out("r9") _, out("r10") _, out("r11") _, out("r12") _,
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out("cr0") _,
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options(nostack)
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);
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i64::from(ret)
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}
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}
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pub(super) unsafe fn sys_sched_getaffinity(
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pid: i32,
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mask_size: usize,
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mask: *mut u8,
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) -> i32 {
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unsafe {
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let ret: i32;
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core::arch::asm!(
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"sc",
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"bns+ 2f",
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"neg 3, 3",
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"2:",
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inlateout("r0") 223i32 => _, // __NR_sched_getaffinity
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inlateout("r3") pid => ret,
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inlateout("r4") mask_size => _,
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inlateout("r5") mask => _,
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out("r6") _, out("r7") _, out("r8") _,
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out("r9") _, out("r10") _, out("r11") _, out("r12") _,
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out("cr0") _,
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options(nostack)
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);
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ret
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}
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}
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pub(super) unsafe fn sys_exit(code: i32) -> ! {
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unsafe {
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core::arch::asm!(
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"li 0, 1", // SYS_exit
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"sc",
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in("r3") code,
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options(noreturn, nostack)
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);
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}
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}
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@ -3,6 +3,7 @@
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#![cfg_attr(
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any(
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target_arch = "powerpc64",
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target_arch = "powerpc",
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target_arch = "sparc64",
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target_arch = "mips64"
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),
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@ -137,6 +138,22 @@ unsafe extern "C" fn _start() {
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);
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}
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// ppc32 has no function descriptors; entry is direct code like ELFv2.
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#[cfg(target_arch = "powerpc")]
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#[unsafe(no_mangle)]
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#[unsafe(naked)]
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unsafe extern "C" fn _start() {
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naked_asm!(
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"mr 3, 1", // first arg = initial sp (argc/argv)
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"clrrwi 1, 1, 4", // align sp to 16 bytes
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"stwu 1, -64(1)", // reserve a frame with back-chain
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"bl {entry_rust}",
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"li 0, 1", // SYS_exit
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"sc",
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entry_rust = sym entry_rust,
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);
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}
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// On ELFv1, the ELF entry point must be a function descriptor
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// in .opd whose first word is the real code address. We emit both manually via
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// `global_asm` so the kernel reads the descriptor and jumps into `_start_impl`.
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