mirror of
https://codeberg.org/ziglang/zig.git
synced 2025-12-06 13:54:21 +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.
274 lines
7.3 KiB
Zig
274 lines
7.3 KiB
Zig
const builtin = @import("builtin");
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const std = @import("../../std.zig");
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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 uid_t = linux.uid_t;
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const gid_t = linux.gid_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 sockaddr = linux.sockaddr;
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const socklen_t = linux.socklen_t;
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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 (
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\\ syscall 0
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: [ret] "={$r4}" (-> usize),
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: [number] "{$r11}" (@intFromEnum(number)),
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: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8", "memory"
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);
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}
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pub fn syscall1(number: SYS, arg1: usize) usize {
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return asm volatile (
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\\ syscall 0
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: [ret] "={$r4}" (-> usize),
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: [number] "{$r11}" (@intFromEnum(number)),
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[arg1] "{$r4}" (arg1),
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: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8", "memory"
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);
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}
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pub fn syscall2(number: SYS, arg1: usize, arg2: usize) usize {
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return asm volatile (
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\\ syscall 0
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: [ret] "={$r4}" (-> usize),
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: [number] "{$r11}" (@intFromEnum(number)),
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[arg1] "{$r4}" (arg1),
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[arg2] "{$r5}" (arg2),
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: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8", "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 (
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\\ syscall 0
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: [ret] "={$r4}" (-> usize),
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: [number] "{$r11}" (@intFromEnum(number)),
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[arg1] "{$r4}" (arg1),
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[arg2] "{$r5}" (arg2),
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[arg3] "{$r6}" (arg3),
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: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8", "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 (
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\\ syscall 0
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: [ret] "={$r4}" (-> usize),
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: [number] "{$r11}" (@intFromEnum(number)),
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[arg1] "{$r4}" (arg1),
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[arg2] "{$r5}" (arg2),
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[arg3] "{$r6}" (arg3),
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[arg4] "{$r7}" (arg4),
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: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8", "memory"
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);
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}
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pub fn syscall5(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) usize {
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return asm volatile (
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\\ syscall 0
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: [ret] "={$r4}" (-> usize),
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: [number] "{$r11}" (@intFromEnum(number)),
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[arg1] "{$r4}" (arg1),
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[arg2] "{$r5}" (arg2),
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[arg3] "{$r6}" (arg3),
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[arg4] "{$r7}" (arg4),
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[arg5] "{$r8}" (arg5),
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: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8", "memory"
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);
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}
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pub fn syscall6(
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number: SYS,
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arg1: usize,
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arg2: usize,
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arg3: usize,
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arg4: usize,
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arg5: usize,
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arg6: usize,
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) usize {
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return asm volatile (
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\\ syscall 0
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: [ret] "={$r4}" (-> usize),
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: [number] "{$r11}" (@intFromEnum(number)),
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[arg1] "{$r4}" (arg1),
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[arg2] "{$r5}" (arg2),
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[arg3] "{$r6}" (arg3),
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[arg4] "{$r7}" (arg4),
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[arg5] "{$r8}" (arg5),
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[arg6] "{$r9}" (arg6),
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: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8", "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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// a0, a1, a2, a3, a4, a5, a6
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// sys_clone(flags, stack, ptid, ctid, tls)
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// a0, a1, a2, a3, a4
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asm volatile (
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\\ bstrins.d $a1, $zero, 3, 0 # stack to 16 align
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\\
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\\ # Save function pointer and argument pointer on new thread stack
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\\ addi.d $a1, $a1, -16
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\\ st.d $a0, $a1, 0 # save function pointer
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\\ st.d $a3, $a1, 8 # save argument pointer
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\\ or $a0, $a2, $zero
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\\ or $a2, $a4, $zero
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\\ or $a3, $a6, $zero
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\\ or $a4, $a5, $zero
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\\ ori $a7, $zero, 220 # SYS_clone
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\\ syscall 0 # call clone
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\\
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\\ beqz $a0, 1f # whether child process
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\\ jirl $zero, $ra, 0 # parent process return
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\\1:
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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 1
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);
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asm volatile (
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\\ move $fp, $zero
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\\ move $ra, $zero
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\\
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\\ ld.d $t8, $sp, 0 # function pointer
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\\ ld.d $a0, $sp, 8 # argument pointer
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\\ jirl $ra, $t8, 0 # call the user's function
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\\ ori $a7, $zero, 93 # SYS_exit
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\\ syscall 0 # child process exit
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);
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}
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pub const restore = restore_rt;
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pub fn restore_rt() callconv(.naked) noreturn {
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asm volatile (
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\\ or $a7, $zero, %[number]
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\\ syscall 0
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:
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: [number] "r" (@intFromEnum(SYS.rt_sigreturn)),
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: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8", "memory"
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);
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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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__pad1: i32 = 0,
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control: ?*anyopaque,
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controllen: socklen_t,
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__pad2: socklen_t = 0,
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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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__pad1: i32 = 0,
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control: ?*const anyopaque,
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controllen: socklen_t,
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__pad2: socklen_t = 0,
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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 = i64;
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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 = u32;
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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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ino: ino_t,
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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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_pad1: u64,
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size: off_t,
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blksize: blksize_t,
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_pad2: i32,
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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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_pad3: [2]u32,
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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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tv_sec: time_t,
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tv_usec: i64,
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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 GETLK = 5;
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pub const SETLK = 6;
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pub const SETLKW = 7;
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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 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_5.10";
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};
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pub const mcontext_t = extern struct {
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pc: u64,
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regs: [32]u64,
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flags: u32,
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extcontext: [0]u64 align(16),
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};
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pub const ucontext_t = extern struct {
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flags: c_ulong,
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link: ?*ucontext_t,
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stack: stack_t,
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sigmask: [1024 / @bitSizeOf(c_ulong)]c_ulong, // Currently a libc-compatible (1024-bit) sigmask
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mcontext: mcontext_t,
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};
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pub const Elf_Symndx = u32;
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/// TODO
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pub const getcontext = {};
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