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c842deea75
We need to set rbp last because the arguments are stored on the stack. If we clobber rbp first, then we will get a segfault when trying to access the function arguments. I believe I had already done this with the other syscall* functions, but not with syscall1, so this allows single argument syscalls like close to work.
74 lines
2.0 KiB
Zig
74 lines
2.0 KiB
Zig
const plan9 = @import("../plan9.zig");
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// TODO better inline asm
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pub fn syscall1(sys: plan9.SYS, arg0: usize) usize {
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return asm volatile (
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\\push %%r8
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\\push $0
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\\syscall
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\\pop %%r11
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\\pop %%r11
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: [ret] "={rax}" (-> usize),
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: [arg0] "{r8}" (arg0),
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[syscall_number] "{rbp}" (@enumToInt(sys)),
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: "rcx", "rax", "rbp", "r11", "memory"
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);
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}
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pub fn syscall2(sys: plan9.SYS, arg0: usize, arg1: usize) usize {
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return asm volatile (
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\\push %%r9
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\\push %%r8
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\\push $0
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\\syscall
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\\pop %%r11
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\\pop %%r11
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\\pop %%r11
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: [ret] "={rax}" (-> usize),
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: [arg0] "{r8}" (arg0),
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[arg1] "{r9}" (arg1),
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[syscall_number] "{rbp}" (@enumToInt(sys)),
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: "rcx", "rax", "rbp", "r11", "memory"
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);
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}
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pub fn syscall3(sys: plan9.SYS, arg0: usize, arg1: usize, arg2: usize) usize {
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return asm volatile (
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\\push %%r10
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\\push %%r9
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\\push %%r8
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\\push $0
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\\syscall
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\\pop %%r11
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\\pop %%r11
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\\pop %%r11
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\\pop %%r11
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: [ret] "={rax}" (-> usize),
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: [arg0] "{r8}" (arg0),
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[arg1] "{r9}" (arg1),
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[arg2] "{r10}" (arg2),
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[syscall_number] "{rbp}" (@enumToInt(sys)),
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: "rcx", "rax", "rbp", "r11", "memory"
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);
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}
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pub fn syscall4(sys: plan9.SYS, arg0: usize, arg1: usize, arg2: usize, arg3: usize) usize {
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return asm volatile (
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\\push %%r11
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\\push %%r10
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\\push %%r9
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\\push %%r8
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\\push $0
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\\syscall
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\\pop %%r11
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\\pop %%r11
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\\pop %%r11
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\\pop %%r11
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\\pop %%r11
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: [ret] "={rax}" (-> usize),
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: [arg0] "{r8}" (arg0),
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[arg1] "{r9}" (arg1),
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[arg2] "{r10}" (arg2),
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[arg2] "{r11}" (arg3),
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[syscall_number] "{rbp}" (@enumToInt(sys)),
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: "rcx", "rax", "rbp", "r11", "memory"
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);
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}
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