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arch: add armv7 support

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Amaan Qureshi 2026-04-16 23:37:34 -04:00
commit 07239e2c0b
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5 changed files with 318 additions and 32 deletions
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140
crates/asm/src/arm.rs Normal file
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@ -0,0 +1,140 @@
//! Syscall implementations for `arm`.
use super::{StatfsBuf, SysInfo, UtsNameBuf};
pub(super) unsafe fn sys_open(path: *const u8, flags: i32) -> i32 {
unsafe {
let ret: i32;
core::arch::asm!(
"svc #0",
in("r7") 5i32, // SYS_open
in("r0") path,
in("r1") flags,
in("r2") 0i32, // mode
lateout("r0") ret,
options(nostack)
);
ret
}
}
pub(super) unsafe fn sys_read(fd: i32, buf: *mut u8, count: usize) -> isize {
unsafe {
let ret: i32;
core::arch::asm!(
"svc #0",
in("r7") 3i32, // SYS_read
in("r0") fd,
in("r1") buf,
in("r2") count,
lateout("r0") ret,
options(nostack)
);
ret as isize
}
}
pub(super) unsafe fn sys_write(fd: i32, buf: *const u8, count: usize) -> isize {
unsafe {
let ret: i32;
core::arch::asm!(
"svc #0",
in("r7") 4i32, // SYS_write
in("r0") fd,
in("r1") buf,
in("r2") count,
lateout("r0") ret,
options(nostack)
);
ret as isize
}
}
pub(super) unsafe fn sys_close(fd: i32) -> i32 {
unsafe {
let ret: i32;
core::arch::asm!(
"svc #0",
in("r7") 6i32, // SYS_close
in("r0") fd,
lateout("r0") ret,
options(nostack)
);
ret
}
}
pub(super) unsafe fn sys_uname(buf: *mut UtsNameBuf) -> i32 {
unsafe {
let ret: i32;
core::arch::asm!(
"svc #0",
in("r7") 122i32, // SYS_newuname
in("r0") buf,
lateout("r0") ret,
options(nostack)
);
ret
}
}
pub(super) unsafe fn sys_statfs(path: *const u8, buf: *mut StatfsBuf) -> i32 {
unsafe {
let ret: i32;
core::arch::asm!(
"svc #0",
in("r7") 266i32, // SYS_statfs64
in("r0") path,
in("r1") core::mem::size_of::<StatfsBuf>(),
in("r2") buf,
lateout("r0") ret,
options(nostack)
);
ret
}
}
pub(super) unsafe fn sys_sysinfo(info: *mut SysInfo) -> i64 {
unsafe {
let ret: i32;
core::arch::asm!(
"svc #0",
in("r7") 116_i32, // __NR_sysinfo
in("r0") info,
lateout("r0") ret,
options(nostack)
);
i64::from(ret)
}
}
pub(super) unsafe fn sys_sched_getaffinity(
pid: i32,
mask_size: usize,
mask: *mut u8,
) -> i32 {
unsafe {
let ret: i32;
core::arch::asm!(
"svc #0",
in("r7") 242i32, // __NR_sched_getaffinity
in("r0") pid,
in("r1") mask_size,
in("r2") mask,
lateout("r0") ret,
options(nostack)
);
ret
}
}
pub(super) unsafe fn sys_exit(code: i32) -> ! {
unsafe {
core::arch::asm!(
"svc #0",
in("r7") 1i32, // SYS_exit
in("r0") code,
options(noreturn, nostack)
);
}
}