mirror of
https://github.com/ziglang/zig.git
synced 2025-12-06 14:23:09 +00:00
d4973c9922
The kernel sets r7 to 0 (success) or -1 (error), and stores the result in r2. When r7 is -1 and the result is positive, it needs to be negated to get the errno value that higher-level code, such as errnoFromSyscall(), expects to see. The old code was missing the check that r2 is positive, but was also doing the r7 check incorrectly; since it can only be set to 0 or -1, the blez instruction would always branch. In practice, this fix is necessary for e.g. the ENOSYS error to be interpreted correctly. This manifested as hitting an unreachable branch when calling process_vm_readv() in std.debug.MemoryAccessor.
444 lines
11 KiB
Zig
444 lines
11 KiB
Zig
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 sockaddr = linux.sockaddr;
|
|
const timespec = linux.timespec;
|
|
|
|
pub fn syscall0(number: SYS) usize {
|
|
return asm volatile (
|
|
\\ syscall
|
|
\\ beq $7, $zero, 1f
|
|
\\ blez $2, 1f
|
|
\\ subu $2, $0, $2
|
|
\\ 1:
|
|
: [ret] "={$2}" (-> usize),
|
|
: [number] "{$2}" (@intFromEnum(number)),
|
|
: "$1", "$3", "$4", "$5", "$6", "$7", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
|
|
);
|
|
}
|
|
|
|
pub fn syscall_pipe(fd: *[2]i32) usize {
|
|
return asm volatile (
|
|
\\ .set noat
|
|
\\ .set noreorder
|
|
\\ syscall
|
|
\\ beq $7, $zero, 1f
|
|
\\ nop
|
|
\\ b 2f
|
|
\\ subu $2, $0, $2
|
|
\\ 1:
|
|
\\ sw $2, 0($4)
|
|
\\ sw $3, 4($4)
|
|
\\ 2:
|
|
: [ret] "={$2}" (-> usize),
|
|
: [number] "{$2}" (@intFromEnum(SYS.pipe)),
|
|
[fd] "{$4}" (fd),
|
|
: "$1", "$3", "$5", "$6", "$7", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
|
|
);
|
|
}
|
|
|
|
pub fn syscall1(number: SYS, arg1: usize) usize {
|
|
return asm volatile (
|
|
\\ syscall
|
|
\\ beq $7, $zero, 1f
|
|
\\ blez $2, 1f
|
|
\\ subu $2, $0, $2
|
|
\\ 1:
|
|
: [ret] "={$2}" (-> usize),
|
|
: [number] "{$2}" (@intFromEnum(number)),
|
|
[arg1] "{$4}" (arg1),
|
|
: "$1", "$3", "$5", "$6", "$7", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
|
|
);
|
|
}
|
|
|
|
pub fn syscall2(number: SYS, arg1: usize, arg2: usize) usize {
|
|
return asm volatile (
|
|
\\ syscall
|
|
\\ beq $7, $zero, 1f
|
|
\\ blez $2, 1f
|
|
\\ subu $2, $0, $2
|
|
\\ 1:
|
|
: [ret] "={$2}" (-> usize),
|
|
: [number] "{$2}" (@intFromEnum(number)),
|
|
[arg1] "{$4}" (arg1),
|
|
[arg2] "{$5}" (arg2),
|
|
: "$1", "$3", "$6", "$7", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
|
|
);
|
|
}
|
|
|
|
pub fn syscall3(number: SYS, arg1: usize, arg2: usize, arg3: usize) usize {
|
|
return asm volatile (
|
|
\\ syscall
|
|
\\ beq $7, $zero, 1f
|
|
\\ blez $2, 1f
|
|
\\ subu $2, $0, $2
|
|
\\ 1:
|
|
: [ret] "={$2}" (-> usize),
|
|
: [number] "{$2}" (@intFromEnum(number)),
|
|
[arg1] "{$4}" (arg1),
|
|
[arg2] "{$5}" (arg2),
|
|
[arg3] "{$6}" (arg3),
|
|
: "$1", "$3", "$7", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
|
|
);
|
|
}
|
|
|
|
pub fn syscall4(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize) usize {
|
|
return asm volatile (
|
|
\\ syscall
|
|
\\ beq $7, $zero, 1f
|
|
\\ blez $2, 1f
|
|
\\ subu $2, $0, $2
|
|
\\ 1:
|
|
: [ret] "={$2}" (-> usize),
|
|
: [number] "{$2}" (@intFromEnum(number)),
|
|
[arg1] "{$4}" (arg1),
|
|
[arg2] "{$5}" (arg2),
|
|
[arg3] "{$6}" (arg3),
|
|
[arg4] "{$7}" (arg4),
|
|
: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
|
|
);
|
|
}
|
|
|
|
pub fn syscall5(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) usize {
|
|
return asm volatile (
|
|
\\ .set noat
|
|
\\ subu $sp, $sp, 24
|
|
\\ sw %[arg5], 16($sp)
|
|
\\ syscall
|
|
\\ addu $sp, $sp, 24
|
|
\\ beq $7, $zero, 1f
|
|
\\ blez $2, 1f
|
|
\\ subu $2, $0, $2
|
|
\\ 1:
|
|
: [ret] "={$2}" (-> usize),
|
|
: [number] "{$2}" (@intFromEnum(number)),
|
|
[arg1] "{$4}" (arg1),
|
|
[arg2] "{$5}" (arg2),
|
|
[arg3] "{$6}" (arg3),
|
|
[arg4] "{$7}" (arg4),
|
|
[arg5] "r" (arg5),
|
|
: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
|
|
);
|
|
}
|
|
|
|
// NOTE: The o32 calling convention requires the callee to reserve 16 bytes for
|
|
// the first four arguments even though they're passed in $a0-$a3.
|
|
|
|
pub fn syscall6(
|
|
number: SYS,
|
|
arg1: usize,
|
|
arg2: usize,
|
|
arg3: usize,
|
|
arg4: usize,
|
|
arg5: usize,
|
|
arg6: usize,
|
|
) usize {
|
|
return asm volatile (
|
|
\\ .set noat
|
|
\\ subu $sp, $sp, 24
|
|
\\ sw %[arg5], 16($sp)
|
|
\\ sw %[arg6], 20($sp)
|
|
\\ syscall
|
|
\\ addu $sp, $sp, 24
|
|
\\ beq $7, $zero, 1f
|
|
\\ blez $2, 1f
|
|
\\ subu $2, $0, $2
|
|
\\ 1:
|
|
: [ret] "={$2}" (-> usize),
|
|
: [number] "{$2}" (@intFromEnum(number)),
|
|
[arg1] "{$4}" (arg1),
|
|
[arg2] "{$5}" (arg2),
|
|
[arg3] "{$6}" (arg3),
|
|
[arg4] "{$7}" (arg4),
|
|
[arg5] "r" (arg5),
|
|
[arg6] "r" (arg6),
|
|
: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
|
|
);
|
|
}
|
|
|
|
pub fn syscall7(
|
|
number: SYS,
|
|
arg1: usize,
|
|
arg2: usize,
|
|
arg3: usize,
|
|
arg4: usize,
|
|
arg5: usize,
|
|
arg6: usize,
|
|
arg7: usize,
|
|
) usize {
|
|
return asm volatile (
|
|
\\ .set noat
|
|
\\ subu $sp, $sp, 32
|
|
\\ sw %[arg5], 16($sp)
|
|
\\ sw %[arg6], 20($sp)
|
|
\\ sw %[arg7], 24($sp)
|
|
\\ syscall
|
|
\\ addu $sp, $sp, 32
|
|
\\ beq $7, $zero, 1f
|
|
\\ blez $2, 1f
|
|
\\ subu $2, $0, $2
|
|
\\ 1:
|
|
: [ret] "={$2}" (-> usize),
|
|
: [number] "{$2}" (@intFromEnum(number)),
|
|
[arg1] "{$4}" (arg1),
|
|
[arg2] "{$5}" (arg2),
|
|
[arg3] "{$6}" (arg3),
|
|
[arg4] "{$7}" (arg4),
|
|
[arg5] "r" (arg5),
|
|
[arg6] "r" (arg6),
|
|
[arg7] "r" (arg7),
|
|
: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
|
|
);
|
|
}
|
|
|
|
pub fn clone() callconv(.Naked) usize {
|
|
// __clone(func, stack, flags, arg, ptid, tls, ctid)
|
|
// 3, 4, 5, 6, 7, 8, 9
|
|
//
|
|
// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
|
|
// 2 4, 5, 6, 7, 8
|
|
asm volatile (
|
|
\\ # Save function pointer and argument pointer on new thread stack
|
|
\\ and $5, $5, -8
|
|
\\ subu $5, $5, 16
|
|
\\ sw $4, 0($5)
|
|
\\ sw $7, 4($5)
|
|
\\ # Shuffle (fn,sp,fl,arg,ptid,tls,ctid) to (fl,sp,ptid,tls,ctid)
|
|
\\ move $4, $6
|
|
\\ lw $6, 16($sp)
|
|
\\ lw $7, 20($sp)
|
|
\\ lw $9, 24($sp)
|
|
\\ subu $sp, $sp, 16
|
|
\\ sw $9, 16($sp)
|
|
\\ li $2, 4120 # SYS_clone
|
|
\\ syscall
|
|
\\ beq $7, $0, 1f
|
|
\\ nop
|
|
\\ addu $sp, $sp, 16
|
|
\\ jr $ra
|
|
\\ subu $2, $0, $2
|
|
\\1:
|
|
\\ beq $2, $0, 1f
|
|
\\ nop
|
|
\\ addu $sp, $sp, 16
|
|
\\ jr $ra
|
|
\\ nop
|
|
\\1:
|
|
\\ lw $25, 0($sp)
|
|
\\ lw $4, 4($sp)
|
|
\\ jalr $25
|
|
\\ nop
|
|
\\ move $4, $2
|
|
\\ li $2, 4001 # SYS_exit
|
|
\\ syscall
|
|
);
|
|
}
|
|
|
|
pub fn restore() callconv(.Naked) noreturn {
|
|
asm volatile (
|
|
\\ syscall
|
|
:
|
|
: [number] "{$2}" (@intFromEnum(SYS.sigreturn)),
|
|
: "$1", "$3", "$4", "$5", "$6", "$7", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
|
|
);
|
|
}
|
|
|
|
pub fn restore_rt() callconv(.Naked) noreturn {
|
|
asm volatile (
|
|
\\ syscall
|
|
:
|
|
: [number] "{$2}" (@intFromEnum(SYS.rt_sigreturn)),
|
|
: "$1", "$3", "$4", "$5", "$6", "$7", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "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 = 24;
|
|
pub const GETOWN = 23;
|
|
pub const SETSIG = 10;
|
|
pub const GETSIG = 11;
|
|
|
|
pub const GETLK = 33;
|
|
pub const SETLK = 34;
|
|
pub const SETLKW = 35;
|
|
|
|
pub const RDLCK = 0;
|
|
pub const WRLCK = 1;
|
|
pub const UNLCK = 2;
|
|
|
|
pub const SETOWN_EX = 15;
|
|
pub const GETOWN_EX = 16;
|
|
|
|
pub const GETOWNER_UIDS = 17;
|
|
};
|
|
|
|
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 Flock = extern struct {
|
|
type: i16,
|
|
whence: i16,
|
|
__pad0: [4]u8,
|
|
start: off_t,
|
|
len: off_t,
|
|
pid: pid_t,
|
|
__unused: [4]u8,
|
|
};
|
|
|
|
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 = i32;
|
|
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: u32,
|
|
__pad0: [3]u32, // Reserved for st_dev expansion
|
|
ino: ino_t,
|
|
mode: mode_t,
|
|
nlink: nlink_t,
|
|
uid: uid_t,
|
|
gid: gid_t,
|
|
rdev: u32,
|
|
__pad1: [3]u32,
|
|
size: off_t,
|
|
atim: timespec,
|
|
mtim: timespec,
|
|
ctim: timespec,
|
|
blksize: blksize_t,
|
|
__pad3: u32,
|
|
blocks: blkcnt_t,
|
|
__pad4: [14]usize,
|
|
|
|
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: isize,
|
|
usec: isize,
|
|
};
|
|
|
|
pub const timezone = extern struct {
|
|
minuteswest: i32,
|
|
dsttime: i32,
|
|
};
|
|
|
|
pub const Elf_Symndx = u32;
|
|
|
|
pub const rlimit_resource = enum(c_int) {
|
|
/// Per-process CPU limit, in seconds.
|
|
CPU,
|
|
|
|
/// Largest file that can be created, in bytes.
|
|
FSIZE,
|
|
|
|
/// Maximum size of data segment, in bytes.
|
|
DATA,
|
|
|
|
/// Maximum size of stack segment, in bytes.
|
|
STACK,
|
|
|
|
/// Largest core file that can be created, in bytes.
|
|
CORE,
|
|
|
|
/// Number of open files.
|
|
NOFILE,
|
|
|
|
/// Address space limit.
|
|
AS,
|
|
|
|
/// Largest resident set size, in bytes.
|
|
/// This affects swapping; processes that are exceeding their
|
|
/// resident set size will be more likely to have physical memory
|
|
/// taken from them.
|
|
RSS,
|
|
|
|
/// Number of processes.
|
|
NPROC,
|
|
|
|
/// Locked-in-memory address space.
|
|
MEMLOCK,
|
|
|
|
/// Maximum number of file locks.
|
|
LOCKS,
|
|
|
|
/// Maximum number of pending signals.
|
|
SIGPENDING,
|
|
|
|
/// Maximum bytes in POSIX message queues.
|
|
MSGQUEUE,
|
|
|
|
/// Maximum nice priority allowed to raise to.
|
|
/// Nice levels 19 .. -20 correspond to 0 .. 39
|
|
/// values of this resource limit.
|
|
NICE,
|
|
|
|
/// Maximum realtime priority allowed for non-privileged
|
|
/// processes.
|
|
RTPRIO,
|
|
|
|
/// Maximum CPU time in µs that a process scheduled under a real-time
|
|
/// scheduling policy may consume without making a blocking system
|
|
/// call before being forcibly descheduled.
|
|
RTTIME,
|
|
|
|
_,
|
|
};
|
|
|
|
/// TODO
|
|
pub const ucontext_t = void;
|
|
|
|
/// TODO
|
|
pub const getcontext = {};
|