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arch: add i686 support

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Amaan Qureshi 2026-04-17 12:20:09 -04:00
commit a6fab02586
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4 changed files with 184 additions and 7 deletions
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149
crates/asm/src/x86.rs Normal file
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@ -0,0 +1,149 @@
//! Syscall implementations for `x86`.
use super::{StatfsBuf, SysInfo, UtsNameBuf};
pub(super) unsafe fn sys_open(path: *const u8, flags: i32) -> i32 {
unsafe {
let ret: i32;
core::arch::asm!(
"push ebx",
"mov ebx, {arg1:e}",
"int 0x80",
"pop ebx",
arg1 = in(reg) path,
inlateout("eax") 5i32 => ret, // SYS_open
in("ecx") flags,
in("edx") 0i32, // mode
);
ret
}
}
pub(super) unsafe fn sys_read(fd: i32, buf: *mut u8, count: usize) -> isize {
unsafe {
let ret: i32;
core::arch::asm!(
"push ebx",
"mov ebx, {arg1:e}",
"int 0x80",
"pop ebx",
arg1 = in(reg) fd,
inlateout("eax") 3i32 => ret, // SYS_read
in("ecx") buf,
in("edx") count,
);
ret as isize
}
}
pub(super) unsafe fn sys_write(fd: i32, buf: *const u8, count: usize) -> isize {
unsafe {
let ret: i32;
core::arch::asm!(
"push ebx",
"mov ebx, {arg1:e}",
"int 0x80",
"pop ebx",
arg1 = in(reg) fd,
inlateout("eax") 4i32 => ret, // SYS_write
in("ecx") buf,
in("edx") count,
);
ret as isize
}
}
pub(super) unsafe fn sys_close(fd: i32) -> i32 {
unsafe {
let ret: i32;
core::arch::asm!(
"push ebx",
"mov ebx, {arg1:e}",
"int 0x80",
"pop ebx",
arg1 = in(reg) fd,
inlateout("eax") 6i32 => ret, // SYS_close
);
ret
}
}
pub(super) unsafe fn sys_uname(buf: *mut UtsNameBuf) -> i32 {
unsafe {
let ret: i32;
core::arch::asm!(
"push ebx",
"mov ebx, {arg1:e}",
"int 0x80",
"pop ebx",
arg1 = in(reg) buf,
inlateout("eax") 122i32 => ret, // SYS_newuname
);
ret
}
}
pub(super) unsafe fn sys_statfs(path: *const u8, buf: *mut StatfsBuf) -> i32 {
unsafe {
let ret: i32;
core::arch::asm!(
"push ebx",
"mov ebx, {arg1:e}",
"int 0x80",
"pop ebx",
arg1 = in(reg) path,
inlateout("eax") 268i32 => ret, // SYS_statfs64
in("ecx") core::mem::size_of::<StatfsBuf>(),
in("edx") buf,
);
ret
}
}
pub(super) unsafe fn sys_sysinfo(info: *mut SysInfo) -> i64 {
unsafe {
let ret: i32;
core::arch::asm!(
"push ebx",
"mov ebx, {arg1:e}",
"int 0x80",
"pop ebx",
arg1 = in(reg) info,
inlateout("eax") 116_i32 => ret, // __NR_sysinfo
);
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!(
"push ebx",
"mov ebx, {arg1:e}",
"int 0x80",
"pop ebx",
arg1 = in(reg) pid,
inlateout("eax") 242i32 => ret, // __NR_sched_getaffinity
in("ecx") mask_size,
in("edx") mask,
);
ret
}
}
pub(super) unsafe fn sys_exit(code: i32) -> ! {
unsafe {
core::arch::asm!(
"mov ebx, {code:e}",
"int 0x80",
code = in(reg) code,
in("eax") 1i32, // SYS_exit
options(noreturn)
);
}
}