mirror of
https://codeberg.org/ziglang/zig.git
synced 2025-12-06 22:04:21 +00:00
cf989374e9
All the existing code that manipulates `ucontext_t` expects there to be a glibc-compatible sigmask (1024-bit). The `ucontext_t` struct need to be cleaned up so the glibc-dependent format is only used when linking glibc/musl library, but that is a more involved change. In practice, no Zig code looks at the sigset field contents, so it just needs to be the right size.
347 lines
8.1 KiB
Zig
347 lines
8.1 KiB
Zig
const std = @import("../../std.zig");
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const maxInt = std.math.maxInt;
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const linux = std.os.linux;
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const SYS = linux.SYS;
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const iovec = std.posix.iovec;
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const iovec_const = std.posix.iovec_const;
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const socklen_t = linux.socklen_t;
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const stack_t = linux.stack_t;
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const sigset_t = linux.sigset_t;
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const uid_t = linux.uid_t;
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const gid_t = linux.gid_t;
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const pid_t = linux.pid_t;
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const sockaddr = linux.sockaddr;
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const timespec = linux.timespec;
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pub fn syscall0(number: SYS) usize {
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return asm volatile ("svc #0"
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: [ret] "={r0}" (-> usize),
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: [number] "{r7}" (@intFromEnum(number)),
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: "memory"
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);
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}
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pub fn syscall1(number: SYS, arg1: usize) usize {
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return asm volatile ("svc #0"
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: [ret] "={r0}" (-> usize),
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: [number] "{r7}" (@intFromEnum(number)),
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[arg1] "{r0}" (arg1),
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: "memory"
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);
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}
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pub fn syscall2(number: SYS, arg1: usize, arg2: usize) usize {
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return asm volatile ("svc #0"
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: [ret] "={r0}" (-> usize),
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: [number] "{r7}" (@intFromEnum(number)),
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[arg1] "{r0}" (arg1),
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[arg2] "{r1}" (arg2),
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: "memory"
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);
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}
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pub fn syscall3(number: SYS, arg1: usize, arg2: usize, arg3: usize) usize {
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return asm volatile ("svc #0"
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: [ret] "={r0}" (-> usize),
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: [number] "{r7}" (@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"
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);
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}
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pub fn syscall4(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize) usize {
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return asm volatile ("svc #0"
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: [ret] "={r0}" (-> usize),
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: [number] "{r7}" (@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"
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);
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}
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pub fn syscall5(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) usize {
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return asm volatile ("svc #0"
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: [ret] "={r0}" (-> usize),
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: [number] "{r7}" (@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"
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);
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}
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pub fn syscall6(
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number: SYS,
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arg1: usize,
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arg2: usize,
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arg3: usize,
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arg4: usize,
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arg5: usize,
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arg6: usize,
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) usize {
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return asm volatile ("svc #0"
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: [ret] "={r0}" (-> usize),
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: [number] "{r7}" (@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"
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);
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}
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pub fn clone() callconv(.naked) usize {
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// __clone(func, stack, flags, arg, ptid, tls, ctid)
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// r0, r1, r2, r3, +0, +4, +8
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//
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// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
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// r7 r0, r1, r2, r3, r4
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asm volatile (
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\\ stmfd sp!,{r4,r5,r6,r7}
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\\ mov r7,#120 // SYS_clone
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\\ mov r6,r3
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\\ mov r5,r0
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\\ mov r0,r2
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\\ and r1,r1,#-16
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\\ ldr r2,[sp,#16]
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\\ ldr r3,[sp,#20]
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\\ ldr r4,[sp,#24]
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\\ svc 0
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\\ tst r0,r0
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\\ beq 1f
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\\ ldmfd sp!,{r4,r5,r6,r7}
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\\ bx lr
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\\
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\\ // https://github.com/llvm/llvm-project/issues/115891
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\\1: mov r7, #0
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\\ mov r11, #0
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\\ mov lr, #0
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\\
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\\ mov r0,r6
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\\ bl 3f
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\\ mov r7,#1 // SYS_exit
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\\ svc 0
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\\
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\\3: bx r5
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);
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}
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pub fn restore() callconv(.naked) noreturn {
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switch (@import("builtin").zig_backend) {
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.stage2_c => asm volatile (
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\\ mov r7, %[number]
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\\ svc #0
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:
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: [number] "I" (@intFromEnum(SYS.sigreturn)),
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: "memory"
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),
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else => asm volatile (
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\\ svc #0
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:
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: [number] "{r7}" (@intFromEnum(SYS.sigreturn)),
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: "memory"
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),
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}
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}
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pub fn restore_rt() callconv(.naked) noreturn {
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switch (@import("builtin").zig_backend) {
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.stage2_c => asm volatile (
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\\ mov r7, %[number]
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\\ svc #0
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:
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: [number] "I" (@intFromEnum(SYS.rt_sigreturn)),
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: "memory"
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),
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else => asm volatile (
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\\ svc #0
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:
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: [number] "{r7}" (@intFromEnum(SYS.rt_sigreturn)),
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: "memory"
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),
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}
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}
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pub const F = struct {
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pub const DUPFD = 0;
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pub const GETFD = 1;
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pub const SETFD = 2;
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pub const GETFL = 3;
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pub const SETFL = 4;
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pub const SETOWN = 8;
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pub const GETOWN = 9;
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pub const SETSIG = 10;
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pub const GETSIG = 11;
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pub const GETLK = 12;
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pub const SETLK = 13;
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pub const SETLKW = 14;
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pub const RDLCK = 0;
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pub const WRLCK = 1;
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pub const UNLCK = 2;
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pub const SETOWN_EX = 15;
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pub const GETOWN_EX = 16;
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pub const GETOWNER_UIDS = 17;
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};
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pub const VDSO = struct {
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pub const CGT_SYM = "__vdso_clock_gettime";
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pub const CGT_VER = "LINUX_2.6";
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};
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pub const HWCAP = struct {
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pub const SWP = 1 << 0;
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pub const HALF = 1 << 1;
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pub const THUMB = 1 << 2;
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pub const @"26BIT" = 1 << 3;
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pub const FAST_MULT = 1 << 4;
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pub const FPA = 1 << 5;
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pub const VFP = 1 << 6;
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pub const EDSP = 1 << 7;
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pub const JAVA = 1 << 8;
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pub const IWMMXT = 1 << 9;
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pub const CRUNCH = 1 << 10;
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pub const THUMBEE = 1 << 11;
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pub const NEON = 1 << 12;
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pub const VFPv3 = 1 << 13;
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pub const VFPv3D16 = 1 << 14;
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pub const TLS = 1 << 15;
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pub const VFPv4 = 1 << 16;
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pub const IDIVA = 1 << 17;
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pub const IDIVT = 1 << 18;
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pub const VFPD32 = 1 << 19;
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pub const IDIV = IDIVA | IDIVT;
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pub const LPAE = 1 << 20;
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pub const EVTSTRM = 1 << 21;
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};
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pub const Flock = extern struct {
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type: i16,
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whence: i16,
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__pad0: [4]u8,
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start: off_t,
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len: off_t,
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pid: pid_t,
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__unused: [4]u8,
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};
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pub const msghdr = extern struct {
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name: ?*sockaddr,
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namelen: socklen_t,
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iov: [*]iovec,
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iovlen: i32,
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control: ?*anyopaque,
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controllen: socklen_t,
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flags: i32,
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};
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pub const msghdr_const = extern struct {
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name: ?*const sockaddr,
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namelen: socklen_t,
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iov: [*]const iovec_const,
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iovlen: i32,
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control: ?*const anyopaque,
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controllen: socklen_t,
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flags: i32,
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};
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pub const blksize_t = i32;
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pub const nlink_t = u32;
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pub const time_t = isize;
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pub const mode_t = u32;
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pub const off_t = i64;
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pub const ino_t = u64;
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pub const dev_t = u64;
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pub const blkcnt_t = i64;
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// The `stat` definition used by the Linux kernel.
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pub const Stat = extern struct {
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dev: dev_t,
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__dev_padding: u32,
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__ino_truncated: u32,
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mode: mode_t,
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nlink: nlink_t,
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uid: uid_t,
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gid: gid_t,
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rdev: dev_t,
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__rdev_padding: u32,
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size: off_t,
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blksize: blksize_t,
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blocks: blkcnt_t,
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atim: timespec,
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mtim: timespec,
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ctim: timespec,
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ino: ino_t,
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pub fn atime(self: @This()) timespec {
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return self.atim;
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}
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pub fn mtime(self: @This()) timespec {
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return self.mtim;
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}
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pub fn ctime(self: @This()) timespec {
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return self.ctim;
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}
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};
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pub const timeval = extern struct {
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sec: i32,
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usec: i32,
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};
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pub const timezone = extern struct {
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minuteswest: i32,
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dsttime: i32,
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};
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pub const mcontext_t = extern struct {
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trap_no: usize,
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error_code: usize,
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oldmask: usize,
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arm_r0: usize,
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arm_r1: usize,
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arm_r2: usize,
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arm_r3: usize,
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arm_r4: usize,
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arm_r5: usize,
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arm_r6: usize,
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arm_r7: usize,
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arm_r8: usize,
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arm_r9: usize,
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arm_r10: usize,
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arm_fp: usize,
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arm_ip: usize,
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arm_sp: usize,
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arm_lr: usize,
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arm_pc: usize,
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arm_cpsr: usize,
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fault_address: usize,
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};
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pub const ucontext_t = extern struct {
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flags: usize,
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link: ?*ucontext_t,
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stack: stack_t,
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mcontext: mcontext_t,
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sigmask: [1024 / @bitSizeOf(c_ulong)]c_ulong, // Currently a libc-compatible (1024-bit) sigmask
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regspace: [64]u64,
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};
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/// TODO
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pub const getcontext = {};
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pub const Elf_Symndx = u32;
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