mirror of
https://codeberg.org/ziglang/zig.git
synced 2025-12-06 13:54:21 +00:00
484 lines
13 KiB
Zig
484 lines
13 KiB
Zig
const builtin = @import("builtin");
|
|
const std = @import("../../std.zig");
|
|
const maxInt = std.math.maxInt;
|
|
const linux = std.os.linux;
|
|
const SYS = linux.SYS;
|
|
const socklen_t = linux.socklen_t;
|
|
const iovec = std.posix.iovec;
|
|
const iovec_const = std.posix.iovec_const;
|
|
const uid_t = linux.uid_t;
|
|
const gid_t = linux.gid_t;
|
|
const pid_t = linux.pid_t;
|
|
const stack_t = linux.stack_t;
|
|
const sigset_t = linux.sigset_t;
|
|
const sockaddr = linux.sockaddr;
|
|
const timespec = linux.timespec;
|
|
|
|
pub fn syscall0(number: SYS) usize {
|
|
return asm volatile ("int $0x80"
|
|
: [ret] "={eax}" (-> usize),
|
|
: [number] "{eax}" (@intFromEnum(number)),
|
|
: "memory"
|
|
);
|
|
}
|
|
|
|
pub fn syscall1(number: SYS, arg1: usize) usize {
|
|
return asm volatile ("int $0x80"
|
|
: [ret] "={eax}" (-> usize),
|
|
: [number] "{eax}" (@intFromEnum(number)),
|
|
[arg1] "{ebx}" (arg1),
|
|
: "memory"
|
|
);
|
|
}
|
|
|
|
pub fn syscall2(number: SYS, arg1: usize, arg2: usize) usize {
|
|
return asm volatile ("int $0x80"
|
|
: [ret] "={eax}" (-> usize),
|
|
: [number] "{eax}" (@intFromEnum(number)),
|
|
[arg1] "{ebx}" (arg1),
|
|
[arg2] "{ecx}" (arg2),
|
|
: "memory"
|
|
);
|
|
}
|
|
|
|
pub fn syscall3(number: SYS, arg1: usize, arg2: usize, arg3: usize) usize {
|
|
return asm volatile ("int $0x80"
|
|
: [ret] "={eax}" (-> usize),
|
|
: [number] "{eax}" (@intFromEnum(number)),
|
|
[arg1] "{ebx}" (arg1),
|
|
[arg2] "{ecx}" (arg2),
|
|
[arg3] "{edx}" (arg3),
|
|
: "memory"
|
|
);
|
|
}
|
|
|
|
pub fn syscall4(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize) usize {
|
|
return asm volatile ("int $0x80"
|
|
: [ret] "={eax}" (-> usize),
|
|
: [number] "{eax}" (@intFromEnum(number)),
|
|
[arg1] "{ebx}" (arg1),
|
|
[arg2] "{ecx}" (arg2),
|
|
[arg3] "{edx}" (arg3),
|
|
[arg4] "{esi}" (arg4),
|
|
: "memory"
|
|
);
|
|
}
|
|
|
|
pub fn syscall5(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) usize {
|
|
return asm volatile ("int $0x80"
|
|
: [ret] "={eax}" (-> usize),
|
|
: [number] "{eax}" (@intFromEnum(number)),
|
|
[arg1] "{ebx}" (arg1),
|
|
[arg2] "{ecx}" (arg2),
|
|
[arg3] "{edx}" (arg3),
|
|
[arg4] "{esi}" (arg4),
|
|
[arg5] "{edi}" (arg5),
|
|
: "memory"
|
|
);
|
|
}
|
|
|
|
pub fn syscall6(
|
|
number: SYS,
|
|
arg1: usize,
|
|
arg2: usize,
|
|
arg3: usize,
|
|
arg4: usize,
|
|
arg5: usize,
|
|
arg6: usize,
|
|
) usize {
|
|
// arg5/arg6 are passed via memory as we're out of registers if ebp is used as frame pointer, or
|
|
// if we're compiling with PIC. We push arg5/arg6 on the stack before changing ebp/esp as the
|
|
// compiler may reference arg5/arg6 as an offset relative to ebp/esp.
|
|
return asm volatile (
|
|
\\ push %[arg5]
|
|
\\ push %[arg6]
|
|
\\ push %%edi
|
|
\\ push %%ebp
|
|
\\ mov 12(%%esp), %%edi
|
|
\\ mov 8(%%esp), %%ebp
|
|
\\ int $0x80
|
|
\\ pop %%ebp
|
|
\\ pop %%edi
|
|
\\ add $8, %%esp
|
|
: [ret] "={eax}" (-> usize),
|
|
: [number] "{eax}" (@intFromEnum(number)),
|
|
[arg1] "{ebx}" (arg1),
|
|
[arg2] "{ecx}" (arg2),
|
|
[arg3] "{edx}" (arg3),
|
|
[arg4] "{esi}" (arg4),
|
|
[arg5] "rm" (arg5),
|
|
[arg6] "rm" (arg6),
|
|
: "memory"
|
|
);
|
|
}
|
|
|
|
pub fn socketcall(call: usize, args: [*]const usize) usize {
|
|
return asm volatile ("int $0x80"
|
|
: [ret] "={eax}" (-> usize),
|
|
: [number] "{eax}" (@intFromEnum(SYS.socketcall)),
|
|
[arg1] "{ebx}" (call),
|
|
[arg2] "{ecx}" (@intFromPtr(args)),
|
|
: "memory"
|
|
);
|
|
}
|
|
|
|
pub fn clone() callconv(.naked) usize {
|
|
// __clone(func, stack, flags, arg, ptid, tls, ctid)
|
|
// +8, +12, +16, +20, +24, +28, +32
|
|
//
|
|
// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
|
|
// eax, ebx, ecx, edx, esi, edi
|
|
asm volatile (
|
|
\\ pushl %%ebp
|
|
\\ movl %%esp,%%ebp
|
|
\\ pushl %%ebx
|
|
\\ pushl %%esi
|
|
\\ pushl %%edi
|
|
\\ // Setup the arguments
|
|
\\ movl 16(%%ebp),%%ebx
|
|
\\ movl 12(%%ebp),%%ecx
|
|
\\ andl $-16,%%ecx
|
|
\\ subl $20,%%ecx
|
|
\\ movl 20(%%ebp),%%eax
|
|
\\ movl %%eax,4(%%ecx)
|
|
\\ movl 8(%%ebp),%%eax
|
|
\\ movl %%eax,0(%%ecx)
|
|
\\ movl 24(%%ebp),%%edx
|
|
\\ movl 28(%%ebp),%%esi
|
|
\\ movl 32(%%ebp),%%edi
|
|
\\ movl $120,%%eax // SYS_clone
|
|
\\ int $128
|
|
\\ testl %%eax,%%eax
|
|
\\ jz 1f
|
|
\\ popl %%edi
|
|
\\ popl %%esi
|
|
\\ popl %%ebx
|
|
\\ popl %%ebp
|
|
\\ retl
|
|
\\
|
|
\\1:
|
|
);
|
|
if (builtin.unwind_tables != .none or !builtin.strip_debug_info) asm volatile (
|
|
\\ .cfi_undefined %%eip
|
|
);
|
|
asm volatile (
|
|
\\ xorl %%ebp,%%ebp
|
|
\\
|
|
\\ popl %%eax
|
|
\\ calll *%%eax
|
|
\\ movl %%eax,%%ebx
|
|
\\ movl $1,%%eax // SYS_exit
|
|
\\ int $128
|
|
);
|
|
}
|
|
|
|
pub fn restore() callconv(.naked) noreturn {
|
|
switch (@import("builtin").zig_backend) {
|
|
.stage2_c => asm volatile (
|
|
\\ movl %[number], %%eax
|
|
\\ int $0x80
|
|
:
|
|
: [number] "i" (@intFromEnum(SYS.sigreturn)),
|
|
: "memory"
|
|
),
|
|
else => asm volatile (
|
|
\\ int $0x80
|
|
:
|
|
: [number] "{eax}" (@intFromEnum(SYS.sigreturn)),
|
|
: "memory"
|
|
),
|
|
}
|
|
}
|
|
|
|
pub fn restore_rt() callconv(.naked) noreturn {
|
|
switch (@import("builtin").zig_backend) {
|
|
.stage2_c => asm volatile (
|
|
\\ movl %[number], %%eax
|
|
\\ int $0x80
|
|
:
|
|
: [number] "i" (@intFromEnum(SYS.rt_sigreturn)),
|
|
: "memory"
|
|
),
|
|
else => asm volatile (
|
|
\\ int $0x80
|
|
:
|
|
: [number] "{eax}" (@intFromEnum(SYS.rt_sigreturn)),
|
|
: "memory"
|
|
),
|
|
}
|
|
}
|
|
|
|
pub const F = struct {
|
|
pub const DUPFD = 0;
|
|
pub const GETFD = 1;
|
|
pub const SETFD = 2;
|
|
pub const GETFL = 3;
|
|
pub const SETFL = 4;
|
|
pub const SETOWN = 8;
|
|
pub const GETOWN = 9;
|
|
pub const SETSIG = 10;
|
|
pub const GETSIG = 11;
|
|
pub const GETLK = 12;
|
|
pub const SETLK = 13;
|
|
pub const SETLKW = 14;
|
|
pub const SETOWN_EX = 15;
|
|
pub const GETOWN_EX = 16;
|
|
pub const GETOWNER_UIDS = 17;
|
|
|
|
pub const RDLCK = 0;
|
|
pub const WRLCK = 1;
|
|
pub const UNLCK = 2;
|
|
};
|
|
|
|
pub const MMAP2_UNIT = 4096;
|
|
|
|
pub const VDSO = struct {
|
|
pub const CGT_SYM = "__vdso_clock_gettime";
|
|
pub const CGT_VER = "LINUX_2.6";
|
|
};
|
|
|
|
pub const ARCH = struct {};
|
|
|
|
pub const Flock = extern struct {
|
|
type: i16,
|
|
whence: i16,
|
|
start: off_t,
|
|
len: off_t,
|
|
pid: pid_t,
|
|
};
|
|
|
|
pub const msghdr = extern struct {
|
|
name: ?*sockaddr,
|
|
namelen: socklen_t,
|
|
iov: [*]iovec,
|
|
iovlen: i32,
|
|
control: ?*anyopaque,
|
|
controllen: socklen_t,
|
|
flags: i32,
|
|
};
|
|
|
|
pub const msghdr_const = extern struct {
|
|
name: ?*const sockaddr,
|
|
namelen: socklen_t,
|
|
iov: [*]const iovec_const,
|
|
iovlen: i32,
|
|
control: ?*const anyopaque,
|
|
controllen: socklen_t,
|
|
flags: i32,
|
|
};
|
|
|
|
pub const blksize_t = i32;
|
|
pub const nlink_t = u32;
|
|
pub const time_t = isize;
|
|
pub const mode_t = u32;
|
|
pub const off_t = i64;
|
|
pub const ino_t = u64;
|
|
pub const dev_t = u64;
|
|
pub const blkcnt_t = i64;
|
|
|
|
// The `stat` definition used by the Linux kernel.
|
|
pub const Stat = extern struct {
|
|
dev: dev_t,
|
|
__dev_padding: u32,
|
|
__ino_truncated: u32,
|
|
mode: mode_t,
|
|
nlink: nlink_t,
|
|
uid: uid_t,
|
|
gid: gid_t,
|
|
rdev: dev_t,
|
|
__rdev_padding: u32,
|
|
size: off_t,
|
|
blksize: blksize_t,
|
|
blocks: blkcnt_t,
|
|
atim: timespec,
|
|
mtim: timespec,
|
|
ctim: timespec,
|
|
ino: ino_t,
|
|
|
|
pub fn atime(self: @This()) timespec {
|
|
return self.atim;
|
|
}
|
|
|
|
pub fn mtime(self: @This()) timespec {
|
|
return self.mtim;
|
|
}
|
|
|
|
pub fn ctime(self: @This()) timespec {
|
|
return self.ctim;
|
|
}
|
|
};
|
|
|
|
pub const timeval = extern struct {
|
|
sec: i32,
|
|
usec: i32,
|
|
};
|
|
|
|
pub const timezone = extern struct {
|
|
minuteswest: i32,
|
|
dsttime: i32,
|
|
};
|
|
|
|
pub const mcontext_t = extern struct {
|
|
gregs: [19]usize,
|
|
fpregs: [*]u8,
|
|
oldmask: usize,
|
|
cr2: usize,
|
|
};
|
|
|
|
pub const REG = struct {
|
|
pub const GS = 0;
|
|
pub const FS = 1;
|
|
pub const ES = 2;
|
|
pub const DS = 3;
|
|
pub const EDI = 4;
|
|
pub const ESI = 5;
|
|
pub const EBP = 6;
|
|
pub const ESP = 7;
|
|
pub const EBX = 8;
|
|
pub const EDX = 9;
|
|
pub const ECX = 10;
|
|
pub const EAX = 11;
|
|
pub const TRAPNO = 12;
|
|
pub const ERR = 13;
|
|
pub const EIP = 14;
|
|
pub const CS = 15;
|
|
pub const EFL = 16;
|
|
pub const UESP = 17;
|
|
pub const SS = 18;
|
|
};
|
|
|
|
pub const ucontext_t = extern struct {
|
|
flags: usize,
|
|
link: ?*ucontext_t,
|
|
stack: stack_t,
|
|
mcontext: mcontext_t,
|
|
sigmask: sigset_t,
|
|
regspace: [64]u64,
|
|
};
|
|
|
|
pub const Elf_Symndx = u32;
|
|
|
|
pub const user_desc = extern struct {
|
|
entry_number: u32,
|
|
base_addr: u32,
|
|
limit: u32,
|
|
flags: packed struct(u32) {
|
|
seg_32bit: u1,
|
|
contents: u2,
|
|
read_exec_only: u1,
|
|
limit_in_pages: u1,
|
|
seg_not_present: u1,
|
|
useable: u1,
|
|
_: u25 = undefined,
|
|
},
|
|
};
|
|
|
|
/// socketcall() call numbers
|
|
pub const SC = struct {
|
|
pub const socket = 1;
|
|
pub const bind = 2;
|
|
pub const connect = 3;
|
|
pub const listen = 4;
|
|
pub const accept = 5;
|
|
pub const getsockname = 6;
|
|
pub const getpeername = 7;
|
|
pub const socketpair = 8;
|
|
pub const send = 9;
|
|
pub const recv = 10;
|
|
pub const sendto = 11;
|
|
pub const recvfrom = 12;
|
|
pub const shutdown = 13;
|
|
pub const setsockopt = 14;
|
|
pub const getsockopt = 15;
|
|
pub const sendmsg = 16;
|
|
pub const recvmsg = 17;
|
|
pub const accept4 = 18;
|
|
pub const recvmmsg = 19;
|
|
pub const sendmmsg = 20;
|
|
};
|
|
|
|
fn gpRegisterOffset(comptime reg_index: comptime_int) usize {
|
|
return @offsetOf(ucontext_t, "mcontext") + @offsetOf(mcontext_t, "gregs") + @sizeOf(usize) * reg_index;
|
|
}
|
|
|
|
noinline fn getContextReturnAddress() usize {
|
|
return @returnAddress();
|
|
}
|
|
|
|
pub fn getContextInternal() callconv(.naked) usize {
|
|
asm volatile (
|
|
\\ movl $0, %[flags_offset:c](%%edx)
|
|
\\ movl $0, %[link_offset:c](%%edx)
|
|
\\ movl %%edi, %[edi_offset:c](%%edx)
|
|
\\ movl %%esi, %[esi_offset:c](%%edx)
|
|
\\ movl %%ebp, %[ebp_offset:c](%%edx)
|
|
\\ movl %%ebx, %[ebx_offset:c](%%edx)
|
|
\\ movl %%edx, %[edx_offset:c](%%edx)
|
|
\\ movl %%ecx, %[ecx_offset:c](%%edx)
|
|
\\ movl %%eax, %[eax_offset:c](%%edx)
|
|
\\ movl (%%esp), %%ecx
|
|
\\ movl %%ecx, %[eip_offset:c](%%edx)
|
|
\\ leal 4(%%esp), %%ecx
|
|
\\ movl %%ecx, %[esp_offset:c](%%edx)
|
|
\\ xorl %%ecx, %%ecx
|
|
\\ movw %%fs, %%cx
|
|
\\ movl %%ecx, %[fs_offset:c](%%edx)
|
|
\\ leal %[regspace_offset:c](%%edx), %%ecx
|
|
\\ movl %%ecx, %[fpregs_offset:c](%%edx)
|
|
\\ fnstenv (%%ecx)
|
|
\\ fldenv (%%ecx)
|
|
\\ pushl %%ebx
|
|
\\ pushl %%esi
|
|
\\ xorl %%ebx, %%ebx
|
|
\\ movl %[sigaltstack], %%eax
|
|
\\ leal %[stack_offset:c](%%edx), %%ecx
|
|
\\ int $0x80
|
|
\\ testl %%eax, %%eax
|
|
\\ jnz 0f
|
|
\\ movl %[sigprocmask], %%eax
|
|
\\ xorl %%ecx, %%ecx
|
|
\\ leal %[sigmask_offset:c](%%edx), %%edx
|
|
\\ movl %[sigset_size], %%esi
|
|
\\ int $0x80
|
|
\\0:
|
|
\\ popl %%esi
|
|
\\ popl %%ebx
|
|
\\ retl
|
|
:
|
|
: [flags_offset] "i" (@offsetOf(ucontext_t, "flags")),
|
|
[link_offset] "i" (@offsetOf(ucontext_t, "link")),
|
|
[edi_offset] "i" (comptime gpRegisterOffset(REG.EDI)),
|
|
[esi_offset] "i" (comptime gpRegisterOffset(REG.ESI)),
|
|
[ebp_offset] "i" (comptime gpRegisterOffset(REG.EBP)),
|
|
[esp_offset] "i" (comptime gpRegisterOffset(REG.ESP)),
|
|
[ebx_offset] "i" (comptime gpRegisterOffset(REG.EBX)),
|
|
[edx_offset] "i" (comptime gpRegisterOffset(REG.EDX)),
|
|
[ecx_offset] "i" (comptime gpRegisterOffset(REG.ECX)),
|
|
[eax_offset] "i" (comptime gpRegisterOffset(REG.EAX)),
|
|
[eip_offset] "i" (comptime gpRegisterOffset(REG.EIP)),
|
|
[fs_offset] "i" (comptime gpRegisterOffset(REG.FS)),
|
|
[fpregs_offset] "i" (@offsetOf(ucontext_t, "mcontext") + @offsetOf(mcontext_t, "fpregs")),
|
|
[regspace_offset] "i" (@offsetOf(ucontext_t, "regspace")),
|
|
[sigaltstack] "i" (@intFromEnum(linux.SYS.sigaltstack)),
|
|
[stack_offset] "i" (@offsetOf(ucontext_t, "stack")),
|
|
[sigprocmask] "i" (@intFromEnum(linux.SYS.rt_sigprocmask)),
|
|
[sigmask_offset] "i" (@offsetOf(ucontext_t, "sigmask")),
|
|
[sigset_size] "i" (linux.NSIG / 8),
|
|
: "cc", "memory", "eax", "ecx", "edx"
|
|
);
|
|
}
|
|
|
|
pub inline fn getcontext(context: *ucontext_t) usize {
|
|
// This method is used so that getContextInternal can control
|
|
// its prologue in order to read ESP from a constant offset.
|
|
// An aligned stack is not needed for getContextInternal.
|
|
var clobber_edx: usize = undefined;
|
|
return asm volatile (
|
|
\\ calll %[getContextInternal:P]
|
|
: [_] "={eax}" (-> usize),
|
|
[_] "={edx}" (clobber_edx),
|
|
: [_] "{edx}" (context),
|
|
[getContextInternal] "X" (&getContextInternal),
|
|
: "cc", "memory", "ecx"
|
|
);
|
|
}
|