Daniel Samson
d19a0ae38d
The shared kernel<->user ABI contract (BootInformation, the SystemCall numbers, DeviceDescriptor, page_size, ...) is now the `system` module at system/system.zig, following the convention that a directory's root file takes the directory's name. One overlap to note: the runtime's syscall wrappers are already `runtime.system`, so the single file that uses both the contract and those wrappers (library/runtime/heap.zig) aliases the wrappers locally as `system_calls`. The two are distinct (top-level `system` vs `runtime.system`); everywhere else the contract is just `system`. Also: the QEMU run's serial capture now lands in the FHS log location, zig-out/var/log/system/serial0-<timestamp>.log — a stand-in for the kernel's own logging system, which will eventually write there itself. Suite 35/35 plus host tests green.
53 lines
2.3 KiB
Zig
53 lines
2.3 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 system = @import("system");
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const SystemCall = system.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)), [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)), [a0] "{rdi}" (a0), [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)), [a0] "{rdi}" (a0), [a1] "{rsi}" (a1), [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)), [a0] "{rdi}" (a0), [a1] "{rsi}" (a1), [a2] "{rdx}" (a2), [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)), [a0] "{rdi}" (a0), [a1] "{rsi}" (a1), [a2] "{rdx}" (a2), [a3] "{r10}" (a3), [a4] "{r8}" (a4),
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: .{ .rcx = true, .r11 = true, .memory = true });
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}
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