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
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
|
/* $OpenBSD: syscall.h,v 1.4 2002/05/24 04:17:00 deraadt Exp $ */
/*
* Copyright (c) 1998 Per Fogelstrom, Opsycon AB
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed under OpenBSD by
* Per Fogelstrom, Opsycon AB, Sweden.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#ifndef __DL_SYSCALL_H__
#define __DL_SYSCALL_H__
#ifdef USE_CACHE
#include <sys/stat.h>
#endif
#include <sys/syscall.h>
#ifndef _dl_MAX_ERRNO
#define _dl_MAX_ERRNO 4096
#endif
#define _dl_check_error(__res) \
((int) __res < 0 && (int) __res >= -_dl_MAX_ERRNO)
/*
* Inlined system call functions that can be used before
* any dynamic address resoving has been done.
*/
extern inline int
_dl_exit (int status)
{
register int __status __asm__ ("$2");
__asm__ volatile ("move $4,%2\n\t"
"syscall"
: "=r" (__status)
: "0" (SYS_exit), "r" (status)
: "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
"$10","$11","$12","$13","$14","$15","$24","$25");
while (1)
;
}
extern inline int
_dl_open (const char* addr, unsigned int flags)
{
register int status __asm__ ("$2");
__asm__ volatile ("move $4,%2\n\t"
"move $5,%3\n\t"
"syscall\n\t"
"beq $7,$0,1f\n\t"
"li $2,-1\n\t"
"1:"
: "=r" (status)
: "0" (SYS_open), "r" (addr), "r" (flags)
: "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
"$10","$11","$12","$13","$14","$15","$24","$25");
return status;
}
extern inline int
_dl_close (int fd)
{
register int status __asm__ ("$2");
__asm__ volatile ("move $4,%2\n\t"
"syscall\n\t"
"beq $7,$0,1f\n\t"
"li $2,-1\n\t"
"1:"
: "=r" (status)
: "0" (SYS_close), "r" (fd)
: "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
"$10","$11","$12","$13","$14","$15","$24","$25");
return status;
}
extern inline int
_dl_write (int fd, const char* buf, int len)
{
register int status __asm__ ("$2");
__asm__ volatile ("move $4,%2\n\t"
"move $5,%3\n\t"
"move $6,%4\n\t"
"syscall\n\t"
"beq $7,$0,1f\n\t"
"li $2,-1\n\t"
"1:"
: "=r" (status)
: "0" (SYS_write), "r" (fd), "r" (buf), "r" (len)
: "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
"$10","$11","$12","$13","$14","$15","$24","$25");
return status;
}
extern inline int
_dl_read (int fd, const char* buf, int len)
{
register int status __asm__ ("$2");
__asm__ volatile ("move $4,%2\n\t"
"move $5,%3\n\t"
"move $6,%4\n\t"
"syscall\n\t"
"beq $7,$0,1f\n\t"
"li $2,-1\n\t"
"1:"
: "=r" (status)
: "0" (SYS_read), "r" (fd), "r" (buf), "r" (len)
: "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
"$10","$11","$12","$13","$14","$15","$24","$25");
return status;
}
extern inline int
_dl_mmap (void *addr, unsigned int size, unsigned int prot,
unsigned int flags, int fd, unsigned int f_offset)
{
register int malloc_buffer __asm__ ("$2");
__asm__ volatile ("addiu $29,-40\n\t"
"move $6,%2\n\t"
"move $7,%3\n\t"
"sw %4,16($29)\n\t"
"sw %5,20($29)\n\t"
#ifdef MIPSEL
"li $4,197\n\t"
"li $5,0\n\t"
"sw %6,24($29)\n\t"
"sw $0,28($29)\n\t"
"sw %7,32($29)\n\t"
"sw $0,36($29)\n\t"
#endif
#ifdef MIPSEB
"li $4,0\n\t"
"li $5,197\n\t"
"sw %6,24($29)\n\t"
"sw $0,28($29)\n\t"
"sw $0,32($29)\n\t"
"sw %7,36($29)\n\t"
#endif
"syscall\n\t"
"addiu $29,40"
: "=r" (malloc_buffer)
: "0" (SYS___syscall), "r" (addr), "r" (size), "r" (prot),
"r" (flags), "r" (fd), "r" (f_offset)
: "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
"$10","$11","$12","$13","$14","$15","$24","$25");
return malloc_buffer;
}
extern inline int
_dl_munmap (const void* addr, unsigned int len)
{
register int status __asm__ ("$2");
__asm__ volatile ("move $4,%2\n\t"
"move $5,%3\n\t"
"syscall\n\t"
"beq $7,$0,1f\n\t"
"li $2,-1\n\t"
"1:"
: "=r" (status)
: "0" (SYS_munmap), "r" (addr), "r" (len)
: "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
"$10","$11","$12","$13","$14","$15","$24","$25");
return status;
}
extern inline int
_dl_mprotect (const void *addr, int size, int prot)
{
register int status __asm__ ("$2");
__asm__ volatile ("move $4,%2\n\t"
"move $5,%3\n\t"
"move $6,%4\n\t"
"syscall"
: "=r" (status)
: "0" (SYS_mprotect), "r" (addr), "r" (size), "r" (prot)
: "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
"$10","$11","$12","$13","$14","$15","$24","$25");
return status;
}
#ifdef USE_CACHE
extern inline int
_dl_stat (const char *addr, struct stat *sb)
{
register int status __asm__ ("$2");
__asm__ volatile ("move $4,%2\n\t"
"move $5,%3\n\t"
"syscall"
: "=r" (status)
: "0" (SYS_stat), "r" (addr), "r" (sb)
: "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
"$10","$11","$12","$13","$14","$15","$24","$25");
return status;
}
#endif
/*
* Not an actual syscall, but we need something in assembly to say
* whether this is OK or not.
*/
extern inline int
_dl_suid_ok (void)
{
unsigned int uid, euid, gid, egid;
__asm__ volatile ("move $2,%1; syscall; move %0,$2"
: "=r" (uid) : "r" (SYS_getuid)
: "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
"$10","$11","$12","$13","$14","$15","$24","$25");
__asm__ volatile ("move $2,%1; syscall; move %0,$2"
: "=r" (euid) : "r" (SYS_geteuid)
: "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
"$10","$11","$12","$13","$14","$15","$24","$25");
__asm__ volatile ("move $2,%1; syscall; move %0,$2"
: "=r" (gid) : "r" (SYS_getgid)
: "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
"$10","$11","$12","$13","$14","$15","$24","$25");
__asm__ volatile ("move $2,%1; syscall; move %0,$2"
: "=r" (egid) : "r" (SYS_getegid)
: "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
"$10","$11","$12","$13","$14","$15","$24","$25");
return (uid == euid && gid == egid);
}
#endif /*__DL_SYSCALL_H__*/
|
