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
|
//! Architecture-specific syscall code.
//!
//! `rustix` has inline assembly sequences using `asm!`, but that requires
//! nightly Rust, so it also has out-of-line ("outline") assembly sequences
//! in .s files. And 32-bit x86 is special (see comments below).
//!
//! This module also has a `choose` submodule which chooses a scheme and is
//! what most of the `rustix` syscalls use.
//!
//! # Safety
//!
//! This contains the inline `asm` statements performing the syscall
//! instructions and FFI declarations declaring the out-of-line ("outline")
//! syscall instructions.
#![allow(unsafe_code)]
#![cfg_attr(not(feature = "all-apis"), allow(unused_imports))]
// When inline asm is available, use it. Otherwise, use out-of-line asm. These
// functions always use the machine's syscall instruction, even when it isn't
// the fastest option available.
#[cfg_attr(asm, path = "inline/mod.rs")]
#[cfg_attr(not(asm), path = "outline/mod.rs")]
pub(in crate::imp) mod asm;
// On most architectures, the architecture syscall instruction is fast, so use
// it directly.
#[cfg(any(
target_arch = "arm",
target_arch = "aarch64",
target_arch = "mips",
target_arch = "mips64",
target_arch = "powerpc64",
target_arch = "riscv64",
target_arch = "x86_64",
))]
pub(in crate::imp) use self::asm as choose;
// On 32-bit x86, use vDSO wrappers for all syscalls. We could use the
// architecture syscall instruction (`int 0x80`), but the vDSO kernel_vsyscall
// mechanism is much faster.
#[cfg(target_arch = "x86")]
pub(in crate::imp) use super::vdso_wrappers::x86_via_vdso as choose;
// This would be the code for always using `int 0x80` on 32-bit x86.
//#[cfg(target_arch = "x86")]
//pub(in crate::imp) use self::asm as choose;
// Macros for invoking system calls.
//
// These factor out:
// - Calling `nr` on the syscall number to convert it into `SyscallNumber`.
// - Calling `.into()` on each of the arguments to convert them into `ArgReg`.
// - Qualifying the `syscall*` and `__NR_*` identifiers.
// - Counting the number of arguments.
macro_rules! syscall {
($nr:ident) => {
$crate::imp::arch::choose::syscall0($crate::imp::reg::nr(linux_raw_sys::general::$nr))
};
($nr:ident, $a0:expr) => {
$crate::imp::arch::choose::syscall1(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
)
};
($nr:ident, $a0:expr, $a1:expr) => {
$crate::imp::arch::choose::syscall2(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
$a1.into(),
)
};
($nr:ident, $a0:expr, $a1:expr, $a2:expr) => {
$crate::imp::arch::choose::syscall3(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
$a1.into(),
$a2.into(),
)
};
($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr) => {
$crate::imp::arch::choose::syscall4(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
$a1.into(),
$a2.into(),
$a3.into(),
)
};
($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr) => {
$crate::imp::arch::choose::syscall5(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
$a1.into(),
$a2.into(),
$a3.into(),
$a4.into(),
)
};
($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr) => {
$crate::imp::arch::choose::syscall6(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
$a1.into(),
$a2.into(),
$a3.into(),
$a4.into(),
$a5.into(),
)
};
($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr, $a6:expr) => {
$crate::imp::arch::choose::syscall7(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
$a1.into(),
$a2.into(),
$a3.into(),
$a4.into(),
$a5.into(),
$a6.into(),
)
};
}
macro_rules! syscall_readonly {
($nr:ident) => {
$crate::imp::arch::choose::syscall0_readonly($crate::imp::reg::nr(
linux_raw_sys::general::$nr,
))
};
($nr:ident, $a0:expr) => {
$crate::imp::arch::choose::syscall1_readonly(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
)
};
($nr:ident, $a0:expr, $a1:expr) => {
$crate::imp::arch::choose::syscall2_readonly(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
$a1.into(),
)
};
($nr:ident, $a0:expr, $a1:expr, $a2:expr) => {
$crate::imp::arch::choose::syscall3_readonly(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
$a1.into(),
$a2.into(),
)
};
($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr) => {
$crate::imp::arch::choose::syscall4_readonly(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
$a1.into(),
$a2.into(),
$a3.into(),
)
};
($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr) => {
$crate::imp::arch::choose::syscall5_readonly(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
$a1.into(),
$a2.into(),
$a3.into(),
$a4.into(),
)
};
($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr) => {
$crate::imp::arch::choose::syscall6_readonly(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
$a1.into(),
$a2.into(),
$a3.into(),
$a4.into(),
$a5.into(),
)
};
($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr, $a6:expr) => {
$crate::imp::arch::choose::syscall7_readonly(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
$a1.into(),
$a2.into(),
$a3.into(),
$a4.into(),
$a5.into(),
$a6.into(),
)
};
}
#[cfg(feature = "runtime")]
macro_rules! syscall_noreturn {
($nr:ident, $a0:expr) => {
$crate::imp::arch::choose::syscall1_noreturn(
$crate::imp::reg::nr(linux_raw_sys::general::$nr),
$a0.into(),
)
};
}
|
