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const builtin = @import("builtin");
const std = @import("../../std.zig");
const SYS = std.os.linux.SYS;
pub fn syscall0(number: SYS) u64 {
return asm volatile ("svc 0"
: [ret] "={r2}" (-> u64),
: [number] "{r1}" (@intFromEnum(number)),
: .{ .memory = true });
}
pub fn syscall1(number: SYS, arg1: u64) u64 {
return asm volatile ("svc 0"
: [ret] "={r2}" (-> u64),
: [number] "{r1}" (@intFromEnum(number)),
[arg1] "{r2}" (arg1),
: .{ .memory = true });
}
pub fn syscall2(number: SYS, arg1: u64, arg2: u64) u64 {
return asm volatile ("svc 0"
: [ret] "={r2}" (-> u64),
: [number] "{r1}" (@intFromEnum(number)),
[arg1] "{r2}" (arg1),
[arg2] "{r3}" (arg2),
: .{ .memory = true });
}
pub fn syscall3(number: SYS, arg1: u64, arg2: u64, arg3: u64) u64 {
return asm volatile ("svc 0"
: [ret] "={r2}" (-> u64),
: [number] "{r1}" (@intFromEnum(number)),
[arg1] "{r2}" (arg1),
[arg2] "{r3}" (arg2),
[arg3] "{r4}" (arg3),
: .{ .memory = true });
}
pub fn syscall4(number: SYS, arg1: u64, arg2: u64, arg3: u64, arg4: u64) u64 {
return asm volatile ("svc 0"
: [ret] "={r2}" (-> u64),
: [number] "{r1}" (@intFromEnum(number)),
[arg1] "{r2}" (arg1),
[arg2] "{r3}" (arg2),
[arg3] "{r4}" (arg3),
[arg4] "{r5}" (arg4),
: .{ .memory = true });
}
pub fn syscall5(number: SYS, arg1: u64, arg2: u64, arg3: u64, arg4: u64, arg5: u64) u64 {
return asm volatile ("svc 0"
: [ret] "={r2}" (-> u64),
: [number] "{r1}" (@intFromEnum(number)),
[arg1] "{r2}" (arg1),
[arg2] "{r3}" (arg2),
[arg3] "{r4}" (arg3),
[arg4] "{r5}" (arg4),
[arg5] "{r6}" (arg5),
: .{ .memory = true });
}
pub fn syscall6(number: SYS, arg1: u64, arg2: u64, arg3: u64, arg4: u64, arg5: u64, arg6: u64) u64 {
return asm volatile ("svc 0"
: [ret] "={r2}" (-> u64),
: [number] "{r1}" (@intFromEnum(number)),
[arg1] "{r2}" (arg1),
[arg2] "{r3}" (arg2),
[arg3] "{r4}" (arg3),
[arg4] "{r5}" (arg4),
[arg5] "{r6}" (arg5),
[arg6] "{r7}" (arg6),
: .{ .memory = true });
}
pub fn clone() callconv(.naked) u64 {
asm volatile (
\\# int clone(
\\# fn, a = r2
\\# stack, b = r3
\\# flags, c = r4
\\# arg, d = r5
\\# ptid, e = r6
\\# tls, f = *(r15+160)
\\# ctid) g = *(r15+168)
\\#
\\# pseudo C code:
\\# tid = syscall(SYS_clone,b,c,e,g,f);
\\# if (!tid) syscall(SYS_exit, a(d));
\\# return tid;
\\
\\# preserve call-saved register used as syscall arg
\\stg %%r6, 48(%%r15)
\\
\\# create initial stack frame for new thread
\\nill %%r3, 0xfff8
\\aghi %%r3, -160
\\lghi %%r0, 0
\\stg %%r0, 0(%%r3)
\\
\\# save fn and arg to child stack
\\stg %%r2, 8(%%r3)
\\stg %%r5, 16(%%r3)
\\
\\# shuffle args into correct registers and call SYS_clone
\\lgr %%r2, %%r3
\\lgr %%r3, %%r4
\\lgr %%r4, %%r6
\\lg %%r5, 168(%%r15)
\\lg %%r6, 160(%%r15)
\\svc 120
\\
\\# restore call-saved register
\\lg %%r6, 48(%%r15)
\\
\\# if error or if we're the parent, return
\\ltgr %%r2, %%r2
\\bnzr %%r14
\\
\\# we're the child
);
if (builtin.unwind_tables != .none or !builtin.strip_debug_info) asm volatile (
\\.cfi_undefined %%r14
);
asm volatile (
\\lghi %%r11, 0
\\lghi %%r14, 0
\\
\\# call fn(arg)
\\lg %%r1, 8(%%r15)
\\lg %%r2, 16(%%r15)
\\basr %%r14, %%r1
\\
\\# call SYS_exit. exit code is already in r2 from fn return value
\\svc 1
\\
);
}
pub fn restore() callconv(.naked) noreturn {
asm volatile (
\\svc 0
:
: [number] "{r1}" (@intFromEnum(SYS.sigreturn)),
);
}
pub fn restore_rt() callconv(.naked) noreturn {
asm volatile (
\\svc 0
:
: [number] "{r1}" (@intFromEnum(SYS.rt_sigreturn)),
);
}
pub const blksize_t = i64;
pub const nlink_t = u64;
pub const time_t = i64;
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,
ino: ino_t,
nlink: nlink_t,
mode: mode_t,
uid: std.os.linux.uid_t,
gid: std.os.linux.gid_t,
rdev: dev_t,
size: off_t,
atim: std.os.linux.timespec,
mtim: std.os.linux.timespec,
ctim: std.os.linux.timespec,
blksize: blksize_t,
blocks: blkcnt_t,
__unused: [3]c_ulong,
pub fn atime(self: @This()) std.os.linux.timespec {
return self.atim;
}
pub fn mtime(self: @This()) std.os.linux.timespec {
return self.mtim;
}
pub fn ctime(self: @This()) std.os.linux.timespec {
return self.ctim;
}
};
pub const VDSO = struct {
pub const CGT_SYM = "__kernel_clock_gettime";
pub const CGT_VER = "LINUX_2.6.29";
};
|
