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
|
/* Copyright (C) 1992, 93, 95-99, 2000 Free Software Foundation,
Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995.
Changed by Kaz Kojima, <kkojima@rr.iij4u.or.jp>.
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. */
#ifndef _LINUX_SH_SYSDEP_H
#define _LINUX_SH_SYSDEP_H 1
/* There is some commonality. */
#include <sysdeps/unix/sh/sysdep.h>
/* 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)
#ifdef __ASSEMBLER__
/* 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 R0
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 savely
test with -4095. */
#define _IMM12 #-12
#undef PSEUDO
#ifdef SHARED
#define PSEUDO(name, syscall_name, args) \
.text; \
ENTRY (name); \
DO_CALL (args, syscall_name); \
mov r0,r1; \
mov _IMM12,r2; \
shad r2,r1; \
not r1,r1; \
tst r1,r1; \
bf 1f; \
mov r0,r4; \
mov.l r12,@-r15; \
sts.l pr,@-r15; \
mov.l 0f,r12; \
mova 0f,r0; \
add r0,r12; \
mov.l 2f,r1; \
mova 2f,r0; \
add r0,r1; \
jsr @r1; \
nop; \
lds.l @r15+,pr; \
rts; \
mov.l @r15+,r12; \
.align 2; \
2: .long PLTJMP(C_SYMBOL_NAME(__syscall_error)); \
0: .long _GLOBAL_OFFSET_TABLE_; \
1:
#else
#define PSEUDO(name, syscall_name, args) \
.text; \
ENTRY (name); \
DO_CALL (args, syscall_name); \
mov r0,r1; \
mov _IMM12,r2; \
shad r2,r1; \
not r1,r1; \
tst r1,r1; \
bf 1f; \
mov.l 2f,r1; \
jmp @r1; \
mov r0, r4; \
.align 2; \
2: .long PLTJMP(C_SYMBOL_NAME(__syscall_error)); \
1:
#endif
#undef PSEUDO_END
#define PSEUDO_END(name) \
SYSCALL_ERROR_HANDLER \
END (name)
#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
#define SYSCALL_INST0 trapa #0x10
#define SYSCALL_INST1 trapa #0x11
#define SYSCALL_INST2 trapa #0x12
#define SYSCALL_INST3 trapa #0x13
#define SYSCALL_INST4 trapa #0x14
#define SYSCALL_INST5 mov.l @(0,r15),r0; trapa #0x15
#define SYSCALL_INST6 mov.l @(0,r15),r0; mov.l @(4,r15),r1; trapa #0x16
#undef DO_CALL
#define DO_CALL(args, syscall_name) \
mov.l 1f,r3; \
SYSCALL_INST##args; \
bra 2f; \
nop; \
.align 2; \
1: .long SYS_ify (syscall_name); \
2:
#else /* not __ASSEMBLER__ */
#define SYSCALL_INST_STR0 "trapa #0x10\n\t"
#define SYSCALL_INST_STR1 "trapa #0x11\n\t"
#define SYSCALL_INST_STR2 "trapa #0x12\n\t"
#define SYSCALL_INST_STR3 "trapa #0x13\n\t"
#define SYSCALL_INST_STR4 "trapa #0x14\n\t"
#define SYSCALL_INST_STR5 "trapa #0x15\n\t"
#define SYSCALL_INST_STR6 "trapa #0x16\n\t"
#define ASMFMT_0
#define ASMFMT_1 \
, "r" (r4)
#define ASMFMT_2 \
, "r" (r4), "r" (r5)
#define ASMFMT_3 \
, "r" (r4), "r" (r5), "r" (r6)
#define ASMFMT_4 \
, "r" (r4), "r" (r5), "r" (r6), "r" (r7)
#define ASMFMT_5 \
, "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0)
#define ASMFMT_6 \
, "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0), "r" (r1)
#define ASMFMT_7 \
, "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0), "r" (r1), "r" (r2)
#define SUBSTITUTE_ARGS_0()
#define SUBSTITUTE_ARGS_1(arg1) \
register long r4 asm ("%r4") = (long)(arg1)
#define SUBSTITUTE_ARGS_2(arg1, arg2) \
register long r4 asm ("%r4") = (long)(arg1); \
register long r5 asm ("%r5") = (long)(arg2)
#define SUBSTITUTE_ARGS_3(arg1, arg2, arg3) \
register long r4 asm ("%r4") = (long)(arg1); \
register long r5 asm ("%r5") = (long)(arg2); \
register long r6 asm ("%r6") = (long)(arg3)
#define SUBSTITUTE_ARGS_4(arg1, arg2, arg3, arg4) \
register long r4 asm ("%r4") = (long)(arg1); \
register long r5 asm ("%r5") = (long)(arg2); \
register long r6 asm ("%r6") = (long)(arg3); \
register long r7 asm ("%r7") = (long)(arg4)
#define SUBSTITUTE_ARGS_5(arg1, arg2, arg3, arg4, arg5) \
register long r4 asm ("%r4") = (long)(arg1); \
register long r5 asm ("%r5") = (long)(arg2); \
register long r6 asm ("%r6") = (long)(arg3); \
register long r7 asm ("%r7") = (long)(arg4); \
register long r0 asm ("%r0") = (long)(arg5)
#define SUBSTITUTE_ARGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \
register long r4 asm ("%r4") = (long)(arg1); \
register long r5 asm ("%r5") = (long)(arg2); \
register long r6 asm ("%r6") = (long)(arg3); \
register long r7 asm ("%r7") = (long)(arg4); \
register long r0 asm ("%r0") = (long)(arg5); \
register long r1 asm ("%r1") = (long)(arg6)
#define SUBSTITUTE_ARGS_7(arg1, arg2, arg3, arg4, arg5, arg6, arg7) \
register long r4 asm ("%r4") = (long)(arg1); \
register long r5 asm ("%r5") = (long)(arg2); \
register long r6 asm ("%r6") = (long)(arg3); \
register long r7 asm ("%r7") = (long)(arg4); \
register long r0 asm ("%r0") = (long)(arg5) \
register long r1 asm ("%r1") = (long)(arg6); \
register long r2 asm ("%r2") = (long)(arg7)
#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...) \
({ \
unsigned long resultvar; \
register long r3 asm ("%r3") = SYS_ify (name); \
SUBSTITUTE_ARGS_##nr(args); \
\
asm volatile (SYSCALL_INST_STR##nr \
: "=z" (resultvar) \
: "r" (r3) ASMFMT_##nr \
: "memory"); \
\
if (resultvar >= 0xfffff001) \
{ \
__set_errno (-resultvar); \
resultvar = 0xffffffff; \
} \
(int) resultvar; })
#endif /* __ASSEMBLER__ */
#endif /* linux/sh/sysdep.h */
|
