mirror of
https://codeberg.org/ziglang/zig.git
synced 2026-04-27 19:09:47 +03:00
Alex Rønne Petersen
67023fc4bd
This required a thorough audit of every syscall wrapper in std.os.linux, so while I was here, I fixed some minor arch-specific bugs, improved some types, simplified some casts, and deleted some dead code. Note that lseek() in particular is still broken for n32 and x32 after this commit; this wrapper will require some special-casing in the arch bits due to its unusual return type width. closes https://github.com/ziglang/zig/issues/22464 closes https://codeberg.org/ziglang/zig/issues/31597
147 lines
3.6 KiB
Zig
147 lines
3.6 KiB
Zig
const builtin = @import("builtin");
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const std = @import("../../std.zig");
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const SYS = std.os.linux.SYS;
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pub const syscall_arg_t = u32;
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pub fn syscall0(
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number: SYS,
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) u32 {
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return asm volatile ("trap0(#1)"
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: [ret] "={r0}" (-> u32),
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: [number] "{r6}" (@intFromEnum(number)),
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: .{ .memory = true });
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}
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pub fn syscall1(
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number: SYS,
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arg1: syscall_arg_t,
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) u32 {
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return asm volatile ("trap0(#1)"
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: [ret] "={r0}" (-> u32),
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: [number] "{r6}" (@intFromEnum(number)),
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[arg1] "{r0}" (arg1),
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: .{ .memory = true });
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}
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pub fn syscall2(
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number: SYS,
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arg1: syscall_arg_t,
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arg2: syscall_arg_t,
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) u32 {
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return asm volatile ("trap0(#1)"
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: [ret] "={r0}" (-> u32),
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: [number] "{r6}" (@intFromEnum(number)),
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[arg1] "{r0}" (arg1),
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[arg2] "{r1}" (arg2),
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: .{ .memory = true });
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}
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pub fn syscall3(
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number: SYS,
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arg1: syscall_arg_t,
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arg2: syscall_arg_t,
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arg3: syscall_arg_t,
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) u32 {
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return asm volatile ("trap0(#1)"
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: [ret] "={r0}" (-> u32),
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: [number] "{r6}" (@intFromEnum(number)),
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[arg1] "{r0}" (arg1),
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[arg2] "{r1}" (arg2),
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[arg3] "{r2}" (arg3),
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: .{ .memory = true });
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}
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pub fn syscall4(
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number: SYS,
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arg1: syscall_arg_t,
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arg2: syscall_arg_t,
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arg3: syscall_arg_t,
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arg4: syscall_arg_t,
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) u32 {
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return asm volatile ("trap0(#1)"
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: [ret] "={r0}" (-> u32),
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: [number] "{r6}" (@intFromEnum(number)),
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[arg1] "{r0}" (arg1),
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[arg2] "{r1}" (arg2),
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[arg3] "{r2}" (arg3),
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[arg4] "{r3}" (arg4),
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: .{ .memory = true });
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}
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pub fn syscall5(number: SYS, arg1: u32, arg2: u32, arg3: u32, arg4: u32, arg5: u32) u32 {
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return asm volatile ("trap0(#1)"
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: [ret] "={r0}" (-> u32),
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: [number] "{r6}" (@intFromEnum(number)),
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[arg1] "{r0}" (arg1),
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[arg2] "{r1}" (arg2),
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[arg3] "{r2}" (arg3),
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[arg4] "{r3}" (arg4),
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[arg5] "{r4}" (arg5),
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: .{ .memory = true });
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}
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pub fn syscall6(
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number: SYS,
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arg1: syscall_arg_t,
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arg2: syscall_arg_t,
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arg3: syscall_arg_t,
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arg4: syscall_arg_t,
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arg5: syscall_arg_t,
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arg6: syscall_arg_t,
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) u32 {
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return asm volatile ("trap0(#1)"
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: [ret] "={r0}" (-> u32),
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: [number] "{r6}" (@intFromEnum(number)),
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[arg1] "{r0}" (arg1),
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[arg2] "{r1}" (arg2),
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[arg3] "{r2}" (arg3),
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[arg4] "{r3}" (arg4),
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[arg5] "{r4}" (arg5),
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[arg6] "{r5}" (arg6),
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: .{ .memory = true });
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}
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pub fn clone() callconv(.naked) u32 {
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// __clone(func, stack, flags, arg, ptid, tls, ctid)
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// r0, r1, r2, r3, r4, r5, +0
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//
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// syscall(SYS_clone, flags, stack, ptid, ctid, tls)
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// r6 r0, r1, r2, r3, r4
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asm volatile (
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\\ allocframe(#8)
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\\
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\\ r11 = r0
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\\ r10 = r3
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\\
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\\ r6 = #220 // SYS_clone
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\\ r0 = r2
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\\ r1 = and(r1, #-8)
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\\ r2 = r4
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\\ r3 = memw(r30 + #8)
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\\ r4 = r5
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\\ trap0(#1)
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\\
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\\ p0 = cmp.eq(r0, #0)
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\\ if (!p0) dealloc_return
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);
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if (builtin.unwind_tables != .none or !builtin.strip_debug_info) asm volatile (
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\\ .cfi_undefined r31
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);
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asm volatile (
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\\ r30 = #0
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\\ r31 = #0
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\\
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\\ r0 = r10
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\\ callr r11
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\\
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\\ r6 = #93 // SYS_exit
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\\ r0 = #0
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\\ trap0(#1)
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);
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}
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pub const time_t = i64;
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pub const VDSO = void;
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