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arch: add riscv32 support

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Amaan Qureshi 2026-04-16 23:41:43 -04:00
commit 0f95ca0f68
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4 changed files with 185 additions and 10 deletions
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142
crates/asm/src/riscv32.rs Normal file
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//! Syscall implementations for `riscv32`.
use super::{StatfsBuf, SysInfo, UtsNameBuf};
pub(super) unsafe fn sys_open(path: *const u8, flags: i32) -> i32 {
unsafe {
let ret: i32;
core::arch::asm!(
"ecall",
in("a7") 56i32, // SYS_openat
in("a0") -100i32, // AT_FDCWD
in("a1") path,
in("a2") flags,
in("a3") 0i32, // mode
lateout("a0") 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!(
"ecall",
in("a7") 63i32, // SYS_read
in("a0") fd,
in("a1") buf,
in("a2") count,
lateout("a0") 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!(
"ecall",
in("a7") 64i32, // SYS_write
in("a0") fd,
in("a1") buf,
in("a2") count,
lateout("a0") ret,
options(nostack)
);
ret as isize
}
}
pub(super) unsafe fn sys_close(fd: i32) -> i32 {
unsafe {
let ret: i32;
core::arch::asm!(
"ecall",
in("a7") 57i32, // SYS_close
in("a0") fd,
lateout("a0") ret,
options(nostack)
);
ret
}
}
pub(super) unsafe fn sys_uname(buf: *mut UtsNameBuf) -> i32 {
unsafe {
let ret: i32;
core::arch::asm!(
"ecall",
in("a7") 160i32, // SYS_uname
in("a0") buf,
lateout("a0") ret,
options(nostack)
);
ret
}
}
pub(super) unsafe fn sys_statfs(path: *const u8, buf: *mut StatfsBuf) -> i32 {
unsafe {
// asm-generic __NR_statfs routes to sys_statfs64 on 32-bit: 3-arg form.
let ret: i32;
core::arch::asm!(
"ecall",
in("a7") 43i32, // __NR_statfs
in("a0") path,
in("a1") core::mem::size_of::<StatfsBuf>(),
in("a2") buf,
lateout("a0") ret,
options(nostack)
);
ret
}
}
pub(super) unsafe fn sys_sysinfo(info: *mut SysInfo) -> i64 {
unsafe {
let ret: i32;
core::arch::asm!(
"ecall",
in("a7") 179_i32, // __NR_sysinfo
in("a0") info,
lateout("a0") 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!(
"ecall",
in("a7") 123i32, // __NR_sched_getaffinity
in("a0") pid,
in("a1") mask_size,
in("a2") mask,
lateout("a0") ret,
options(nostack)
);
ret
}
}
pub(super) unsafe fn sys_exit(code: i32) -> ! {
unsafe {
core::arch::asm!(
"ecall",
in("a7") 93i32, // SYS_exit
in("a0") code,
options(noreturn, nostack)
);
}
}