47 lines
1,020 B
Rust
47 lines
1,020 B
Rust
#[naked]
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pub unsafe extern fn syscall() {
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#[inline(never)]
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unsafe fn inner() {
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extern {
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fn syscall(a: usize, b: usize, c: usize, d: usize, e: usize, f: usize, stack: usize) -> usize;
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}
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let mut a;
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{
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let b;
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let c;
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let d;
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let e;
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let f;
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let stack;
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asm!("" : "={rax}"(a), "={rbx}"(b), "={rcx}"(c), "={rdx}"(d), "={rsi}"(e), "={rdi}"(f), "={rbp}"(stack)
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: : : "intel", "volatile");
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a = syscall(a, b, c, d, e, f, stack);
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}
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asm!("" : : "{rax}"(a) : : "intel", "volatile");
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}
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asm!("push fs
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push rax
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mov rax, 0x18
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mov fs, ax
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pop rax"
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: : : : "intel", "volatile");
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inner();
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// Interrupt return
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asm!("pop fs
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iretq"
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: : : : "intel", "volatile");
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}
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#[naked]
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pub unsafe extern fn clone_ret() -> usize {
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asm!("pop rbp"
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: : : : "intel", "volatile");
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0
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}
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