72 lines
2.2 KiB
Zig
72 lines
2.2 KiB
Zig
const SYS_read = 0;
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const SYS_write = 1;
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const SYS_mmap = 9;
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const SYS_munmap = 11;
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const SYS_exit = 60;
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const SYS_getrandom = 318;
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// mmap constants
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pub const MMAP_PROT_NONE = 0;
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pub const MMAP_PROT_READ = 1;
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pub const MMAP_PROT_WRITE = 2;
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pub const MMAP_PROT_EXEC = 4;
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pub const MMAP_MAP_FILE = 0;
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pub const MMAP_MAP_SHARED = 1;
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pub const MMAP_MAP_PRIVATE = 2;
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pub const MMAP_MAP_FIXED = 16;
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pub const MMAP_MAP_ANON = 32;
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fn syscall1(number: isize, arg1: isize) -> isize {
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asm volatile ("syscall"
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: [ret] "={rax}" (-> isize)
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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: isize, arg1: isize, arg2: isize, arg3: isize) -> isize {
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asm volatile ("syscall"
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: [ret] "={rax}" (-> isize)
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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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fn syscall2(number: isize, arg1: isize, arg2: isize) -> isize {
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asm volatile ("syscall"
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: [ret] "={rax}" (-> isize)
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: [number] "{rax}" (number), [arg1] "{rdi}" (arg1), [arg2] "{rsi}" (arg2)
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: "rcx", "r11")
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}
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fn syscall6(number: isize, arg1: isize, arg2: isize, arg3: isize, arg4: isize, arg5: isize, arg6: isize) -> isize {
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asm volatile ("syscall"
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: [ret] "={rax}" (-> isize)
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: [number] "{rax}" (number), [arg1] "{rdi}" (arg1), [arg2] "{rsi}" (arg2), [arg3] "{rdx}" (arg3), [arg4] "{r10}" (arg4), [arg5] "{r8}" (arg5), [arg6] "{r9}" (arg6)
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: "rcx", "r11")
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}
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pub fn mmap(address: isize, length: isize, prot: isize, flags: isize, fd: isize, offset: isize) -> isize {
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syscall6(SYS_mmap, address, length, prot, flags, fd, offset)
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}
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pub fn munmap(address: isize, length: isize) -> isize {
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syscall2(SYS_munmap, address, length)
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}
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pub fn read(fd: isize, buf: &u8, count: isize) -> isize {
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syscall3(SYS_read, isize(fd), isize(buf), count)
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}
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pub fn write(fd: isize, buf: &const u8, count: isize) -> isize {
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syscall3(SYS_write, isize(fd), isize(buf), count)
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}
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pub fn exit(status: i32) -> unreachable {
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syscall1(SYS_exit, isize(status));
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unreachable{}
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}
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pub fn getrandom(buf: &u8, count: isize, flags: u32) -> isize {
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syscall3(SYS_getrandom, isize(buf), count, isize(flags))
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}
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