68 lines
2.4 KiB
Zig
68 lines
2.4 KiB
Zig
//! Raw `system_call` instruction wrappers for user space — one per arity.
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//!
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//! ABI: number in rax, arguments in rdi, rsi, rdx, r10, r8, r9, result in rax.
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//! The `system_call` instruction itself clobbers rcx (it holds the return rip) and
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//! r11 (the saved rflags); the kernel entry stub preserves everything else.
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//! Note argument #3 goes in **r10, not rcx** — rcx is unavailable across the
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//! instruction, so the kernel reads the 4th argument from r10.
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const abi = @import("abi");
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const SystemCall = abi.SystemCall;
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pub inline fn systemCall0(n: SystemCall) usize {
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return asm volatile ("syscall"
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: [ret] "={rax}" (-> usize),
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: [n] "{rax}" (@intFromEnum(n)),
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: .{ .rcx = true, .r11 = true, .memory = true });
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}
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pub inline fn systemCall1(n: SystemCall, a0: usize) usize {
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return asm volatile ("syscall"
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: [ret] "={rax}" (-> usize),
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: [n] "{rax}" (@intFromEnum(n)),
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[a0] "{rdi}" (a0),
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: .{ .rcx = true, .r11 = true, .memory = true });
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}
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pub inline fn systemCall2(n: SystemCall, a0: usize, a1: usize) usize {
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return asm volatile ("syscall"
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: [ret] "={rax}" (-> usize),
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: [n] "{rax}" (@intFromEnum(n)),
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[a0] "{rdi}" (a0),
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[a1] "{rsi}" (a1),
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: .{ .rcx = true, .r11 = true, .memory = true });
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}
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pub inline fn systemCall3(n: SystemCall, a0: usize, a1: usize, a2: usize) usize {
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return asm volatile ("syscall"
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: [ret] "={rax}" (-> usize),
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: [n] "{rax}" (@intFromEnum(n)),
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[a0] "{rdi}" (a0),
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[a1] "{rsi}" (a1),
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[a2] "{rdx}" (a2),
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: .{ .rcx = true, .r11 = true, .memory = true });
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}
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pub inline fn systemCall4(n: SystemCall, a0: usize, a1: usize, a2: usize, a3: usize) usize {
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return asm volatile ("syscall"
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: [ret] "={rax}" (-> usize),
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: [n] "{rax}" (@intFromEnum(n)),
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[a0] "{rdi}" (a0),
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[a1] "{rsi}" (a1),
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[a2] "{rdx}" (a2),
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[a3] "{r10}" (a3),
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: .{ .rcx = true, .r11 = true, .memory = true });
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}
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pub inline fn systemCall5(n: SystemCall, a0: usize, a1: usize, a2: usize, a3: usize, a4: usize) usize {
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return asm volatile ("syscall"
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: [ret] "={rax}" (-> usize),
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: [n] "{rax}" (@intFromEnum(n)),
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[a0] "{rdi}" (a0),
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[a1] "{rsi}" (a1),
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[a2] "{rdx}" (a2),
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[a3] "{r10}" (a3),
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[a4] "{r8}" (a4),
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: .{ .rcx = true, .r11 = true, .memory = true });
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}
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