summaryrefslogtreecommitdiff
path: root/libc/sysdeps/linux/powerpc/bits/syscalls.h
blob: 1c7b929b261d548847cb0cdf727d606d12a54925 (plain)
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
/* Copyright (C) 1992,1997-2003,2004,2005,2006 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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 _BITS_SYSCALLS_H
#define _BITS_SYSCALLS_H

#ifndef _SYSCALL_H
# error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
#endif

#ifndef __ASSEMBLER__

# include <errno.h>

# ifdef SHARED
#  define INLINE_VSYSCALL(name, nr, args...) \
  ({									      \
    __label__ out;							      \
    __label__ iserr;							      \
    INTERNAL_SYSCALL_DECL (sc_err);					      \
    long int sc_ret;							      \
									      \
    if (__vdso_##name != NULL)						      \
      {									      \
	sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, sc_err, nr, ##args);   \
	if (!INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))			      \
	  goto out;							      \
	if (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err) != ENOSYS)		      \
	  goto iserr;							      \
      }									      \
									      \
    sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, ##args);		      \
    if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))			      \
      {									      \
      iserr:								      \
        __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err));		      \
        sc_ret = -1L;							      \
      }									      \
  out:									      \
    sc_ret;								      \
  })
# else
#  define INLINE_VSYSCALL(name, nr, args...) \
  INLINE_SYSCALL (name, nr, ##args)
# endif

# ifdef SHARED
#  define INTERNAL_VSYSCALL(name, err, nr, args...) \
  ({									      \
    __label__ out;							      \
    long int v_ret;							      \
									      \
    if (__vdso_##name != NULL)						      \
      {									      \
	v_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args);	      \
	if (!INTERNAL_SYSCALL_ERROR_P (v_ret, err)			      \
	    || INTERNAL_SYSCALL_ERRNO (v_ret, err) != ENOSYS)		      \
	  goto out;							      \
      }									      \
    v_ret = INTERNAL_SYSCALL (name, err, nr, ##args);			      \
  out:									      \
    v_ret;								      \
  })
# else
#  define INTERNAL_VSYSCALL(name, err, nr, args...) \
  INTERNAL_SYSCALL (name, err, nr, ##args)
# endif

# define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, nr, args...)	      \
  ({									      \
    long int sc_ret = ENOSYS;						      \
									      \
    if (__vdso_##name != NULL)						      \
      sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args);	      \
    else								      \
      err = 1 << 28;							      \
    sc_ret;								      \
  })

/* List of system calls which are supported as vsyscalls.  */
# define HAVE_CLOCK_GETRES_VSYSCALL	1
# define HAVE_CLOCK_GETTIME_VSYSCALL	1

/* Define a macro which expands inline into the wrapper code for a VDSO
   call. This use is for internal calls that do not need to handle errors
   normally. It will never touch errno.
   On powerpc a system call basically clobbers the same registers like a
   function call, with the exception of LR (which is needed for the
   "sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
   an error return status).  */
# define INTERNAL_VSYSCALL_NCS(funcptr, err, nr, args...) \
  ({									      \
    register void *r0  __asm__ ("r0");					      \
    register long int r3  __asm__ ("r3");				      \
    register long int r4  __asm__ ("r4");				      \
    register long int r5  __asm__ ("r5");				      \
    register long int r6  __asm__ ("r6");				      \
    register long int r7  __asm__ ("r7");				      \
    register long int r8  __asm__ ("r8");				      \
    register long int r9  __asm__ ("r9");				      \
    register long int r10 __asm__ ("r10");				      \
    register long int r11 __asm__ ("r11");				      \
    register long int r12 __asm__ ("r12");				      \
    LOAD_ARGS_##nr (funcptr, args);					      \
    __asm__ __volatile__						      \
      ("mtctr %0\n\t"							      \
       "bctrl\n\t"							      \
       "mfcr %0"							      \
       : "=&r" (r0),							      \
	 "=&r" (r3), "=&r" (r4), "=&r" (r5),  "=&r" (r6),  "=&r" (r7),	      \
	 "=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12)	      \
       : ASM_INPUT_##nr							      \
       : "cr0", "ctr", "lr", "memory");					      \
    err = (long int) r0;						      \
    (int) r3;								      \
  })

/* Define a macro which expands inline into the wrapper code for a system
   call. This use is for internal calls that do not need to handle errors
   normally. It will never touch errno.
   On powerpc a system call basically clobbers the same registers like a
   function call, with the exception of LR (which is needed for the
   "sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
   an error return status).  */

# define INTERNAL_SYSCALL_DECL(err) long int err

# define INTERNAL_SYSCALL_NCS(name, err, nr, args...)			\
  ({									\
    register long int r0  __asm__ ("r0");				\
    register long int r3  __asm__ ("r3");				\
    register long int r4  __asm__ ("r4");				\
    register long int r5  __asm__ ("r5");				\
    register long int r6  __asm__ ("r6");				\
    register long int r7  __asm__ ("r7");				\
    register long int r8  __asm__ ("r8");				\
    register long int r9  __asm__ ("r9");				\
    register long int r10 __asm__ ("r10");				\
    register long int r11 __asm__ ("r11");				\
    register long int r12 __asm__ ("r12");				\
    LOAD_ARGS_##nr(name, args);						\
    __asm__ __volatile__						\
      ("sc   \n\t"							\
       "mfcr %0"							\
       : "=&r" (r0),							\
	 "=&r" (r3), "=&r" (r4), "=&r" (r5),  "=&r" (r6),  "=&r" (r7),	\
	 "=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12)	\
       : ASM_INPUT_##nr							\
       : "cr0", "ctr", "memory");					\
    err = r0;								\
    (int) r3;								\
  })

# define INTERNAL_SYSCALL_ERROR_P(val, err) \
  ((void) (val), __builtin_expect ((err) & (1 << 28), 0))

# define INTERNAL_SYSCALL_ERRNO(val, err)     (val)

extern void __illegally_sized_syscall_arg1(void);
extern void __illegally_sized_syscall_arg2(void);
extern void __illegally_sized_syscall_arg3(void);
extern void __illegally_sized_syscall_arg4(void);
extern void __illegally_sized_syscall_arg5(void);
extern void __illegally_sized_syscall_arg6(void);

# define LOAD_ARGS_0(name, dummy) \
	r0 = name
# define LOAD_ARGS_1(name, __arg1) \
	long int arg1 = (long int) (__arg1); \
	LOAD_ARGS_0(name, 0); \
	if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 4) \
	  __illegally_sized_syscall_arg1 (); \
	r3 = arg1
# define LOAD_ARGS_2(name, __arg1, __arg2) \
	long int arg2 = (long int) (__arg2); \
	LOAD_ARGS_1(name, __arg1); \
	if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 4) \
	  __illegally_sized_syscall_arg2 (); \
	r4 = arg2
# define LOAD_ARGS_3(name, __arg1, __arg2, __arg3) \
	long int arg3 = (long int) (__arg3); \
	LOAD_ARGS_2(name, __arg1, __arg2); \
	if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 4) \
	  __illegally_sized_syscall_arg3 (); \
	r5 = arg3
# define LOAD_ARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
	long int arg4 = (long int) (__arg4); \
	LOAD_ARGS_3(name, __arg1, __arg2, __arg3); \
	if (__builtin_classify_type (__arg4) != 5 && sizeof (__arg4) > 4) \
	  __illegally_sized_syscall_arg4 (); \
	r6 = arg4
# define LOAD_ARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
	long int arg5 = (long int) (__arg5); \
	LOAD_ARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
	if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 4) \
	  __illegally_sized_syscall_arg5 (); \
	r7 = arg5
# define LOAD_ARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
	long int arg6 = (long int) (__arg6); \
	LOAD_ARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
	if (__builtin_classify_type (__arg6) != 5 && sizeof (__arg6) > 4) \
	  __illegally_sized_syscall_arg6 (); \
	r8 = arg6

# define ASM_INPUT_0 "0" (r0)
# define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
# define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
# define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
# define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
# define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
# define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)

#endif /* __ASSEMBLER__ */


/* Pointer mangling support.  */
#if defined NOT_IN_libc && defined IS_IN_rtld
/* We cannot use the thread descriptor because in ld.so we use setjmp
   earlier than the descriptor is initialized.  */
#else
# ifdef __ASSEMBLER__
#  define PTR_MANGLE(reg, tmpreg) \
	lwz	tmpreg,POINTER_GUARD(r2); \
	xor	reg,tmpreg,reg
#  define PTR_MANGLE2(reg, tmpreg) \
	xor	reg,tmpreg,reg
#  define PTR_MANGLE3(destreg, reg, tmpreg) \
	lwz	tmpreg,POINTER_GUARD(r2); \
	xor	destreg,tmpreg,reg
#  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
#  define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
#  define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
# else
#  define PTR_MANGLE(var) \
  (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
#  define PTR_DEMANGLE(var)	PTR_MANGLE (var)
# endif
#endif

#endif /* _BITS_SYSCALLS_H */