1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
const builtin = @import("builtin");
const std = @import("../../std.zig");
const iovec = std.posix.iovec;
const iovec_const = std.posix.iovec_const;
const linux = std.os.linux;
const SYS = linux.SYS;
const uid_t = std.os.linux.uid_t;
const gid_t = std.os.linux.gid_t;
const pid_t = std.os.linux.pid_t;
const sockaddr = linux.sockaddr;
const socklen_t = linux.socklen_t;
const timespec = std.os.linux.timespec;
const stack_t = std.os.linux.stack_t;
const sigset_t = std.os.linux.sigset_t;
pub fn syscall0(number: SYS) usize {
return asm volatile ("svc 0"
: [ret] "={r2}" (-> usize),
: [number] "{r1}" (@intFromEnum(number)),
: .{ .memory = true });
}
pub fn syscall1(number: SYS, arg1: usize) usize {
return asm volatile ("svc 0"
: [ret] "={r2}" (-> usize),
: [number] "{r1}" (@intFromEnum(number)),
[arg1] "{r2}" (arg1),
: .{ .memory = true });
}
pub fn syscall2(number: SYS, arg1: usize, arg2: usize) usize {
return asm volatile ("svc 0"
: [ret] "={r2}" (-> usize),
: [number] "{r1}" (@intFromEnum(number)),
[arg1] "{r2}" (arg1),
[arg2] "{r3}" (arg2),
: .{ .memory = true });
}
pub fn syscall3(number: SYS, arg1: usize, arg2: usize, arg3: usize) usize {
return asm volatile ("svc 0"
: [ret] "={r2}" (-> usize),
: [number] "{r1}" (@intFromEnum(number)),
[arg1] "{r2}" (arg1),
[arg2] "{r3}" (arg2),
[arg3] "{r4}" (arg3),
: .{ .memory = true });
}
pub fn syscall4(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize) usize {
return asm volatile ("svc 0"
: [ret] "={r2}" (-> usize),
: [number] "{r1}" (@intFromEnum(number)),
[arg1] "{r2}" (arg1),
[arg2] "{r3}" (arg2),
[arg3] "{r4}" (arg3),
[arg4] "{r5}" (arg4),
: .{ .memory = true });
}
pub fn syscall5(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) usize {
return asm volatile ("svc 0"
: [ret] "={r2}" (-> usize),
: [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: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize, arg6: usize) usize {
return asm volatile ("svc 0"
: [ret] "={r2}" (-> usize),
: [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) usize {
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 const restore = restore_rt;
pub fn restore_rt() callconv(.naked) noreturn {
asm volatile (
\\svc 0
:
: [number] "{r1}" (@intFromEnum(SYS.rt_sigreturn)),
);
}
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 GETLK = 5;
pub const SETLK = 6;
pub const SETLKW = 7;
pub const SETOWN = 8;
pub const GETOWN = 9;
pub const SETSIG = 10;
pub const GETSIG = 11;
pub const SETOWN_EX = 15;
pub const GETOWN_EX = 16;
pub const GETOWNER_UIDS = 17;
};
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;
pub const Flock = extern struct {
type: i16,
whence: i16,
start: off_t,
len: off_t,
pid: pid_t,
};
// 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: uid_t,
gid: gid_t,
rdev: dev_t,
size: off_t,
atim: timespec,
mtim: timespec,
ctim: timespec,
blksize: blksize_t,
blocks: blkcnt_t,
__unused: [3]c_ulong,
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 VDSO = struct {
pub const CGT_SYM = "__kernel_clock_gettime";
pub const CGT_VER = "LINUX_2.6.29";
};
|
