37 lines
1.1 KiB
Zig
37 lines
1.1 KiB
Zig
const SYS_read : usize = 0;
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const SYS_write : usize = 1;
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const SYS_exit : usize = 60;
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const SYS_getrandom : usize = 318;
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fn syscall1(number: usize, arg1: usize) -> usize {
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asm volatile ("syscall"
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: [ret] "={rax}" (-> usize)
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: [number] "{rax}" (number), [arg1] "{rdi}" (arg1)
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: "rcx", "r11")
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}
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fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) -> usize {
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asm volatile ("syscall"
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: [ret] "={rax}" (-> usize)
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: [number] "{rax}" (number), [arg1] "{rdi}" (arg1), [arg2] "{rsi}" (arg2), [arg3] "{rdx}" (arg3)
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: "rcx", "r11")
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}
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pub fn read(fd: isize, buf: &u8, count: usize) -> isize {
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syscall3(SYS_read, fd as usize, buf as usize, count) as isize
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}
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pub fn write(fd: isize, buf: &const u8, count: usize) -> isize {
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syscall3(SYS_write, fd as usize, buf as usize, count) as isize
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}
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pub fn exit(status: i32) -> unreachable {
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syscall1(SYS_exit, status as usize);
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unreachable
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}
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pub fn getrandom(buf: &u8, count: usize, flags: u32) -> isize {
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syscall3(SYS_getrandom, buf as usize, count, flags as usize) as isize
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}
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