1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
pub fn main() noreturn {
const msg = "hello world\n";
_ = syscall3(SYS_write, STDOUT_FILENO, @intFromPtr(msg), msg.len);
_ = syscall1(SYS_exit, 0);
unreachable;
}
pub const SYS_write = 1;
pub const SYS_exit = 60;
pub const STDOUT_FILENO = 1;
pub fn syscall1(number: usize, arg1: usize) usize {
return asm volatile ("syscall"
: [ret] "={rax}" (-> usize),
: [number] "{rax}" (number),
[arg1] "{rdi}" (arg1),
: .{ .rcx = true, .r11 = true });
}
pub fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) usize {
return asm volatile ("syscall"
: [ret] "={rax}" (-> usize),
: [number] "{rax}" (number),
[arg1] "{rdi}" (arg1),
[arg2] "{rsi}" (arg2),
[arg3] "{rdx}" (arg3),
: .{ .rcx = true, .r11 = true });
}
// exe=succeed
// target=x86_64-linux
|
