mirror of
https://codeberg.org/ziglang/zig.git
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278 lines
7 KiB
Zig
278 lines
7 KiB
Zig
const builtin = @import("builtin");
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const std = @import("../../std.zig");
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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 linux = std.os.linux;
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const SYS = linux.SYS;
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const uid_t = std.os.linux.uid_t;
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const gid_t = std.os.linux.gid_t;
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const pid_t = std.os.linux.pid_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 = std.os.linux.timespec;
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const stack_t = std.os.linux.stack_t;
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const sigset_t = std.os.linux.sigset_t;
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pub fn syscall0(number: SYS) usize {
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return asm volatile ("svc 0"
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: [ret] "={r2}" (-> usize),
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: [number] "{r1}" (@intFromEnum(number)),
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: .{ .memory = true });
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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] "={r2}" (-> usize),
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: [number] "{r1}" (@intFromEnum(number)),
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[arg1] "{r2}" (arg1),
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: .{ .memory = true });
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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] "={r2}" (-> usize),
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: [number] "{r1}" (@intFromEnum(number)),
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[arg1] "{r2}" (arg1),
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[arg2] "{r3}" (arg2),
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: .{ .memory = true });
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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] "={r2}" (-> usize),
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: [number] "{r1}" (@intFromEnum(number)),
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[arg1] "{r2}" (arg1),
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[arg2] "{r3}" (arg2),
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[arg3] "{r4}" (arg3),
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: .{ .memory = true });
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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] "={r2}" (-> usize),
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: [number] "{r1}" (@intFromEnum(number)),
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[arg1] "{r2}" (arg1),
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[arg2] "{r3}" (arg2),
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[arg3] "{r4}" (arg3),
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[arg4] "{r5}" (arg4),
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: .{ .memory = true });
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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] "={r2}" (-> usize),
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: [number] "{r1}" (@intFromEnum(number)),
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[arg1] "{r2}" (arg1),
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[arg2] "{r3}" (arg2),
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[arg3] "{r4}" (arg3),
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[arg4] "{r5}" (arg4),
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[arg5] "{r6}" (arg5),
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: .{ .memory = true });
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}
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pub fn syscall6(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize, arg6: usize) usize {
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return asm volatile ("svc 0"
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: [ret] "={r2}" (-> usize),
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: [number] "{r1}" (@intFromEnum(number)),
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[arg1] "{r2}" (arg1),
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[arg2] "{r3}" (arg2),
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[arg3] "{r4}" (arg3),
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[arg4] "{r5}" (arg4),
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[arg5] "{r6}" (arg5),
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[arg6] "{r7}" (arg6),
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: .{ .memory = true });
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}
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pub fn clone() callconv(.naked) usize {
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asm volatile (
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\\# int clone(
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\\# fn, a = r2
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\\# stack, b = r3
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\\# flags, c = r4
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\\# arg, d = r5
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\\# ptid, e = r6
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\\# tls, f = *(r15+160)
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\\# ctid) g = *(r15+168)
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\\#
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\\# pseudo C code:
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\\# tid = syscall(SYS_clone,b,c,e,g,f);
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\\# if (!tid) syscall(SYS_exit, a(d));
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\\# return tid;
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\\
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\\# preserve call-saved register used as syscall arg
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\\stg %%r6, 48(%%r15)
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\\
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\\# create initial stack frame for new thread
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\\nill %%r3, 0xfff8
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\\aghi %%r3, -160
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\\lghi %%r0, 0
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\\stg %%r0, 0(%%r3)
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\\
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\\# save fn and arg to child stack
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\\stg %%r2, 8(%%r3)
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\\stg %%r5, 16(%%r3)
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\\
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\\# shuffle args into correct registers and call SYS_clone
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\\lgr %%r2, %%r3
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\\lgr %%r3, %%r4
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\\lgr %%r4, %%r6
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\\lg %%r5, 168(%%r15)
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\\lg %%r6, 160(%%r15)
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\\svc 120
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\\
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\\# restore call-saved register
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\\lg %%r6, 48(%%r15)
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\\
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\\# if error or if we're the parent, return
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\\ltgr %%r2, %%r2
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\\bnzr %%r14
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\\
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\\# we're the child
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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 %%r14
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);
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asm volatile (
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\\lghi %%r11, 0
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\\lghi %%r14, 0
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\\
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\\# call fn(arg)
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\\lg %%r1, 8(%%r15)
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\\lg %%r2, 16(%%r15)
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\\basr %%r14, %%r1
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\\
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\\# call SYS_exit. exit code is already in r2 from fn return value
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\\svc 1
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\\
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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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\\svc 0
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:
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: [number] "{r1}" (@intFromEnum(SYS.rt_sigreturn)),
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: .{ .memory = true });
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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 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 blksize_t = i64;
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pub const nlink_t = u64;
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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 = u64;
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pub const blkcnt_t = i64;
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pub const timeval = extern struct {
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sec: time_t,
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usec: i64,
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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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start: off_t,
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len: off_t,
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pid: pid_t,
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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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__pad1: i32 = 0,
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iovlen: i32,
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control: ?*anyopaque,
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__pad2: i32 = 0,
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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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__pad1: i32 = 0,
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iovlen: i32,
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control: ?*const anyopaque,
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__pad2: i32 = 0,
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controllen: socklen_t,
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flags: i32,
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};
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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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nlink: nlink_t,
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mode: mode_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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size: off_t,
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atim: timespec,
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mtim: timespec,
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ctim: timespec,
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blksize: blksize_t,
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blocks: blkcnt_t,
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__unused: [3]c_ulong,
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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 Elf_Symndx = u64;
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pub const VDSO = struct {
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pub const CGT_SYM = "__kernel_clock_gettime";
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pub const CGT_VER = "LINUX_2.6.29";
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};
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pub const ucontext_t = extern struct {
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flags: u64,
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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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};
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pub const mcontext_t = extern struct {
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__regs1: [18]u64,
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__regs2: [18]u32,
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__regs3: [16]f64,
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};
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/// TODO
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pub const getcontext = {};
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