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
|
/* Assembler macros for PA-RISC.
Copyright (C) 1999,2001,02 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper, <drepper@cygnus.com>, August 1999.
Linux/PA-RISC changes by Philipp Rumpf, <prumpf@tux.org>, March 2000.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <asm/unistd.h>
#include <sysdeps/generic/sysdep.h>
#include <sys/syscall.h>
#include "config.h"
#ifndef ASM_LINE_SEP
#define ASM_LINE_SEP ;
#endif
#undef SYS_ify
#define SYS_ify(syscall_name) (__NR_##syscall_name)
#ifdef __ASSEMBLER__
/* Syntactic details of assembler. */
#define ALIGNARG(log2) log2
/* For Linux we can use the system call table in the header file
/usr/include/asm/unistd.h
of the kernel. But these symbols do not follow the SYS_* syntax
so we have to redefine the `SYS_ify' macro here. */
#undef SYS_ify
#define SYS_ify(syscall_name) __NR_##syscall_name
/* ELF-like local names start with `.L'. */
#undef L
#define L(name) .L##name
/* Linux uses a negative return value to indicate syscall errors,
unlike most Unices, which use the condition codes' carry flag.
Since version 2.1 the return value of a system call might be
negative even if the call succeeded. E.g., the `lseek' system call
might return a large offset. Therefore we must not anymore test
for < 0, but test for a real error by making sure the value in %eax
is a real error number. Linus said he will make sure the no syscall
returns a value in -1 .. -4095 as a valid result so we can safely
test with -4095. */
/* We don't want the label for the error handle to be global when we define
it here. */
#ifdef PIC
# define SYSCALL_ERROR_LABEL 0f
#else
# define SYSCALL_ERROR_LABEL syscall_error
#endif
/* Define an entry point visible from C.
There is currently a bug in gdb which prevents us from specifying
incomplete stabs information. Fake some entries here which specify
the current source file. */
#define ENTRY(name) \
.text ASM_LINE_SEP \
.export C_SYMBOL_NAME(name) ASM_LINE_SEP \
.type C_SYMBOL_NAME(name),@function ASM_LINE_SEP \
C_LABEL(name) \
CALL_MCOUNT
#define ret \
bv 0(2) ASM_LINE_SEP \
nop
#undef END
#define END(name) \
1: .size C_SYMBOL_NAME(name),1b-C_SYMBOL_NAME(name)
/* If compiled for profiling, call `mcount' at the start of each function. */
/* No, don't bother. gcc will put the call in for us. */
#define CALL_MCOUNT /* Do nothing. */
/* syscall wrappers consist of
#include <sysdep.h>
PSEUDO(...)
ret
PSEUDO_END(...)
which means
ENTRY(name)
DO_CALL(...)
nop
bv 0(2)
nop
*/
#define PSEUDO(name, syscall_name, args) \
ENTRY (name) \
DO_CALL(syscall_name, args) ASM_LINE_SEP \
nop
#undef PSEUDO_END
#define PSEUDO_END(name) \
END (name)
#define JUMPTARGET(name) name
#define SYSCALL_PIC_SETUP /* Nothing. */
/* Linux takes system call arguments in registers:
syscall number gr20
arg 1 gr26
arg 2 gr25
arg 3 gr24
arg 4 gr23
arg 5 gr22
arg 6 gr21
The compiler calls us by the C convention:
syscall number in the DO_CALL macro
arg 1 gr26
arg 2 gr25
arg 3 gr24
arg 4 gr23
arg 5 -52(gr30)
arg 6 -56(gr30)
gr22 and gr21 are caller-saves, so we can just load the arguments
there and generally be happy. */
/* the cmpb...no_error code below inside DO_CALL
* is intended to mimic the if (__sys_res...)
* code inside INLINE_SYSCALL
*/
#undef DO_CALL
#define DO_CALL(syscall_name, args) \
DOARGS_##args \
ble 0x100(%sr2,%r0) ASM_LINE_SEP \
ldi SYS_ify (syscall_name), %r20 ASM_LINE_SEP \
ldi -0x1000,%r1 ASM_LINE_SEP \
cmpb,>>=,n %r1,%ret0,0f ASM_LINE_SEP \
stw %rp, -20(%sr0,%r30) ASM_LINE_SEP \
stw %ret0, -24(%sr0,%r30) ASM_LINE_SEP \
.import __errno_location,code ASM_LINE_SEP \
bl __errno_location,%rp ASM_LINE_SEP \
ldo 64(%r30), %r30 ASM_LINE_SEP \
ldo -64(%r30), %r30 ASM_LINE_SEP \
ldw -24(%r30), %r26 ASM_LINE_SEP \
sub %r0, %r26, %r26 ASM_LINE_SEP \
stw %r26, 0(%sr0,%ret0) ASM_LINE_SEP \
ldo -1(%r0), %ret0 ASM_LINE_SEP \
ldw -20(%r30), %rp ASM_LINE_SEP \
0: ASM_LINE_SEP \
UNDOARGS_##args
#define DOARGS_0 /* nothing */
#define DOARGS_1 /* nothing */
#define DOARGS_2 /* nothing */
#define DOARGS_3 /* nothing */
#define DOARGS_4 /* nothing */
#define DOARGS_5 ldw -52(%r30), %r22 ASM_LINE_SEP
#define DOARGS_6 ldw -52(%r30), %r22 ASM_LINE_SEP \
ldw -56(%r30), %r21 ASM_LINE_SEP
#define UNDOARGS_0 /* nothing */
#define UNDOARGS_1 /* nothing */
#define UNDOARGS_2 /* nothing */
#define UNDOARGS_3 /* nothing */
#define UNDOARGS_4 /* nothing */
#define UNDOARGS_5 /* nothing */
#define UNDOARGS_6 /* nothing */
#else
#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...) ({ \
long __sys_res; \
{ \
register unsigned long __res asm("r28"); \
LOAD_ARGS_##nr(args) \
asm volatile( \
"ble 0x100(%%sr2, %%r0)\n\t" \
" ldi %1, %%r20" \
: "=r" (__res) \
: "i" (SYS_ify(name)) ASM_ARGS_##nr \
); \
__sys_res = __res; \
} \
if ((unsigned long)__sys_res >= (unsigned long)-4095) { \
__set_errno(-__sys_res); \
__sys_res = -1; \
} \
__sys_res; \
})
#define LOAD_ARGS_0()
#define LOAD_ARGS_1(r26) \
register unsigned long __r26 __asm__("r26") = (unsigned long)r26; \
LOAD_ARGS_0()
#define LOAD_ARGS_2(r26,r25) \
register unsigned long __r25 __asm__("r25") = (unsigned long)r25; \
LOAD_ARGS_1(r26)
#define LOAD_ARGS_3(r26,r25,r24) \
register unsigned long __r24 __asm__("r24") = (unsigned long)r24; \
LOAD_ARGS_2(r26,r25)
#define LOAD_ARGS_4(r26,r25,r24,r23) \
register unsigned long __r23 __asm__("r23") = (unsigned long)r23; \
LOAD_ARGS_3(r26,r25,r24)
#define LOAD_ARGS_5(r26,r25,r24,r23,r22) \
register unsigned long __r22 __asm__("r22") = (unsigned long)r22; \
LOAD_ARGS_4(r26,r25,r24,r23)
#define LOAD_ARGS_6(r26,r25,r24,r23,r22,r21) \
register unsigned long __r21 __asm__("r21") = (unsigned long)r21; \
LOAD_ARGS_5(r26,r25,r24,r23,r22)
#define ASM_ARGS_0
#define ASM_ARGS_1 , "r" (__r26)
#define ASM_ARGS_2 , "r" (__r26), "r" (__r25)
#define ASM_ARGS_3 , "r" (__r26), "r" (__r25), "r" (__r24)
#define ASM_ARGS_4 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23)
#define ASM_ARGS_5 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23), "r" (__r22)
#define ASM_ARGS_6 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23), "r" (__r22), "r" (__r21)
#endif /* __ASSEMBLER__ */
|
