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26 lines
622 B
26 lines
622 B
pub const STDOUT: usize = 1;
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const SYSCALL_WRITE: usize = 64;
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const SYSCALL_EXIT: usize = 93;
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fn syscall(id: usize, args: [usize; 3]) -> isize {
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let mut ret: isize;
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unsafe {
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llvm_asm!("ecall"
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: "={x10}" (ret)
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: "{x10}" (args[0]), "{x11}" (args[1]), "{x12}" (args[2]), "{x17}" (id)
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: "memory"
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: "volatile"
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);
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}
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ret
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}
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pub fn sys_write(fd: usize, buffer: &[u8]) -> isize {
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syscall(SYSCALL_WRITE, [fd, buffer.as_ptr() as usize, buffer.len()])
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}
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pub fn sys_exit(xstate: i32) -> isize {
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syscall(SYSCALL_EXIT, [xstate as usize, 0, 0])
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}
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