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
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
|
/* Copyright (C) 1992-2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Brendan Kehoe (brendan@zen.org).
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, see
<http://www.gnu.org/licenses/>. */
#include <sysdeps/unix/sysdep.h>
#ifdef __ASSEMBLER__
#ifdef __linux__
# include <alpha/regdef.h>
#else
# include <regdef.h>
#endif
#ifdef IS_IN_rtld
# include <dl-sysdep.h> /* Defines RTLD_PRIVATE_ERRNO. */
#endif
#define __LABEL(x) x##:
#define LEAF(name, framesize) \
.globl name; \
.align 4; \
.ent name, 0; \
__LABEL(name) \
.frame sp, framesize, ra
#define ENTRY(name) \
.globl name; \
.align 4; \
.ent name, 0; \
__LABEL(name) \
.frame sp, 0, ra
/* Mark the end of function SYM. */
#undef END
#define END(sym) .end sym
#ifdef PROF
# define PSEUDO_PROF \
.set noat; \
lda AT, _mcount; \
jsr AT, (AT), _mcount; \
.set at
#else
# define PSEUDO_PROF
#endif
#ifdef PROF
# define PSEUDO_PROLOGUE \
.frame sp, 0, ra; \
ldgp gp,0(pv); \
PSEUDO_PROF; \
.prologue 1
#elif defined PIC
# define PSEUDO_PROLOGUE \
.frame sp, 0, ra; \
.prologue 0
#else
# define PSEUDO_PROLOGUE \
.frame sp, 0, ra; \
ldgp gp,0(pv); \
.prologue 1
#endif /* PROF */
#ifdef PROF
# define USEPV_PROF std
#else
# define USEPV_PROF no
#endif
#if RTLD_PRIVATE_ERRNO
# define SYSCALL_ERROR_LABEL $syscall_error
# define SYSCALL_ERROR_HANDLER \
$syscall_error: \
stl v0, rtld_errno(gp) !gprel; \
lda v0, -1; \
ret
# define SYSCALL_ERROR_FALLTHRU
#elif defined(PIC)
# define SYSCALL_ERROR_LABEL __syscall_error !samegp
# define SYSCALL_ERROR_HANDLER
# define SYSCALL_ERROR_FALLTHRU br SYSCALL_ERROR_LABEL
#else
# define SYSCALL_ERROR_LABEL $syscall_error
# define SYSCALL_ERROR_HANDLER \
$syscall_error: \
jmp $31, __syscall_error
# define SYSCALL_ERROR_FALLTHRU
#endif /* RTLD_PRIVATE_ERRNO */
/* Overridden by specific syscalls. */
#undef PSEUDO_PREPARE_ARGS
#define PSEUDO_PREPARE_ARGS /* Nothing. */
#define PSEUDO(name, syscall_name, args) \
.globl name; \
.align 4; \
.ent name,0; \
__LABEL(name) \
PSEUDO_PROLOGUE; \
PSEUDO_PREPARE_ARGS \
lda v0, SYS_ify(syscall_name); \
call_pal PAL_callsys; \
bne a3, SYSCALL_ERROR_LABEL
#undef PSEUDO_END
#define PSEUDO_END(sym) \
SYSCALL_ERROR_HANDLER; \
END(sym)
#define PSEUDO_NOERRNO(name, syscall_name, args) \
.globl name; \
.align 4; \
.ent name,0; \
__LABEL(name) \
PSEUDO_PROLOGUE; \
PSEUDO_PREPARE_ARGS \
lda v0, SYS_ify(syscall_name); \
call_pal PAL_callsys;
#undef PSEUDO_END_NOERRNO
#define PSEUDO_END_NOERRNO(sym) END(sym)
#define ret_NOERRNO ret
#define PSEUDO_ERRVAL(name, syscall_name, args) \
.globl name; \
.align 4; \
.ent name,0; \
__LABEL(name) \
PSEUDO_PROLOGUE; \
PSEUDO_PREPARE_ARGS \
lda v0, SYS_ify(syscall_name); \
call_pal PAL_callsys;
#undef PSEUDO_END_ERRVAL
#define PSEUDO_END_ERRVAL(sym) END(sym)
#define ret_ERRVAL ret
#define r0 v0
#define r1 a4
#define MOVE(x,y) mov x,y
#else /* !ASSEMBLER */
/* ??? Linux needs to be able to override INLINE_SYSCALL for one
particular special case. Make this easy. */
#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...) \
INLINE_SYSCALL1(name, nr, args)
#define INLINE_SYSCALL1(name, nr, args...) \
({ \
long _sc_ret, _sc_err; \
inline_syscall##nr(__NR_##name, args); \
if (__builtin_expect (_sc_err, 0)) \
{ \
__set_errno (_sc_ret); \
_sc_ret = -1L; \
} \
_sc_ret; \
})
#define INTERNAL_SYSCALL(name, err_out, nr, args...) \
INTERNAL_SYSCALL1(name, err_out, nr, args)
#define INTERNAL_SYSCALL1(name, err_out, nr, args...) \
INTERNAL_SYSCALL_NCS(__NR_##name, err_out, nr, args)
#define INTERNAL_SYSCALL_NCS(name, err_out, nr, args...) \
({ \
long _sc_ret, _sc_err; \
inline_syscall##nr(name, args); \
err_out = _sc_err; \
_sc_ret; \
})
#define INTERNAL_SYSCALL_DECL(err) \
long int err __attribute__((unused))
/* The normal Alpha calling convention sign-extends 32-bit quantties
no matter what the "real" sign of the 32-bit type. We want to
preserve that when filling in values for the kernel. */
#define syscall_promote(arg) \
(sizeof(arg) == 4 ? (long)(int)(long)(arg) : (long)(arg))
/* Make sure and "use" the variable that we're not returning,
in order to suppress unused variable warnings. */
#define INTERNAL_SYSCALL_ERROR_P(val, err) ((void)val, err)
#define INTERNAL_SYSCALL_ERRNO(val, err) ((void)err, val)
#define inline_syscall_clobbers \
"$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", \
"$22", "$23", "$24", "$25", "$27", "$28", "memory"
/* It is moderately important optimization-wise to limit the lifetime
of the hard-register variables as much as possible. Thus we copy
in/out as close to the asm as possible. */
#define inline_syscall0(name, args...) \
{ \
register long _sc_19 __asm__("$19"); \
register long _sc_0 = name; \
__asm__ __volatile__ \
("callsys # %0 %1 <= %2" \
: "+v"(_sc_0), "=r"(_sc_19) \
: : inline_syscall_clobbers, \
"$16", "$17", "$18", "$20", "$21"); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
#define inline_syscall1(name,arg1) \
{ \
register long _tmp_16 = syscall_promote (arg1); \
register long _sc_0 = name; \
register long _sc_16 __asm__("$16") = _tmp_16; \
register long _sc_19 __asm__("$19"); \
__asm__ __volatile__ \
("callsys # %0 %1 <= %2 %3" \
: "+v"(_sc_0), "=r"(_sc_19), "+r"(_sc_16) \
: : inline_syscall_clobbers, \
"$17", "$18", "$20", "$21"); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
#define inline_syscall2(name,arg1,arg2) \
{ \
register long _tmp_16 = syscall_promote (arg1); \
register long _tmp_17 = syscall_promote (arg2); \
register long _sc_0 = name; \
register long _sc_16 __asm__("$16") = _tmp_16; \
register long _sc_17 __asm__("$17") = _tmp_17; \
register long _sc_19 __asm__("$19"); \
__asm__ __volatile__ \
("callsys # %0 %1 <= %2 %3 %4" \
: "+v"(_sc_0), "=r"(_sc_19), \
"+r"(_sc_16), "+r"(_sc_17) \
: : inline_syscall_clobbers, \
"$18", "$20", "$21"); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
#define inline_syscall3(name,arg1,arg2,arg3) \
{ \
register long _tmp_16 = syscall_promote (arg1); \
register long _tmp_17 = syscall_promote (arg2); \
register long _tmp_18 = syscall_promote (arg3); \
register long _sc_0 = name; \
register long _sc_16 __asm__("$16") = _tmp_16; \
register long _sc_17 __asm__("$17") = _tmp_17; \
register long _sc_18 __asm__("$18") = _tmp_18; \
register long _sc_19 __asm__("$19"); \
__asm__ __volatile__ \
("callsys # %0 %1 <= %2 %3 %4 %5" \
: "+v"(_sc_0), "=r"(_sc_19), "+r"(_sc_16), \
"+r"(_sc_17), "+r"(_sc_18) \
: : inline_syscall_clobbers, "$20", "$21"); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
#define inline_syscall4(name,arg1,arg2,arg3,arg4) \
{ \
register long _tmp_16 = syscall_promote (arg1); \
register long _tmp_17 = syscall_promote (arg2); \
register long _tmp_18 = syscall_promote (arg3); \
register long _tmp_19 = syscall_promote (arg4); \
register long _sc_0 = name; \
register long _sc_16 __asm__("$16") = _tmp_16; \
register long _sc_17 __asm__("$17") = _tmp_17; \
register long _sc_18 __asm__("$18") = _tmp_18; \
register long _sc_19 __asm__("$19") = _tmp_19; \
__asm__ __volatile__ \
("callsys # %0 %1 <= %2 %3 %4 %5 %6" \
: "+v"(_sc_0), "+r"(_sc_19), "+r"(_sc_16), \
"+r"(_sc_17), "+r"(_sc_18) \
: : inline_syscall_clobbers, "$20", "$21"); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
#define inline_syscall5(name,arg1,arg2,arg3,arg4,arg5) \
{ \
register long _tmp_16 = syscall_promote (arg1); \
register long _tmp_17 = syscall_promote (arg2); \
register long _tmp_18 = syscall_promote (arg3); \
register long _tmp_19 = syscall_promote (arg4); \
register long _tmp_20 = syscall_promote (arg5); \
register long _sc_0 = name; \
register long _sc_16 __asm__("$16") = _tmp_16; \
register long _sc_17 __asm__("$17") = _tmp_17; \
register long _sc_18 __asm__("$18") = _tmp_18; \
register long _sc_19 __asm__("$19") = _tmp_19; \
register long _sc_20 __asm__("$20") = _tmp_20; \
__asm__ __volatile__ \
("callsys # %0 %1 <= %2 %3 %4 %5 %6 %7" \
: "+v"(_sc_0), "+r"(_sc_19), "+r"(_sc_16), \
"+r"(_sc_17), "+r"(_sc_18), "+r"(_sc_20) \
: : inline_syscall_clobbers, "$21"); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
#define inline_syscall6(name,arg1,arg2,arg3,arg4,arg5,arg6) \
{ \
register long _tmp_16 = syscall_promote (arg1); \
register long _tmp_17 = syscall_promote (arg2); \
register long _tmp_18 = syscall_promote (arg3); \
register long _tmp_19 = syscall_promote (arg4); \
register long _tmp_20 = syscall_promote (arg5); \
register long _tmp_21 = syscall_promote (arg6); \
register long _sc_0 = name; \
register long _sc_16 __asm__("$16") = _tmp_16; \
register long _sc_17 __asm__("$17") = _tmp_17; \
register long _sc_18 __asm__("$18") = _tmp_18; \
register long _sc_19 __asm__("$19") = _tmp_19; \
register long _sc_20 __asm__("$20") = _tmp_20; \
register long _sc_21 __asm__("$21") = _tmp_21; \
__asm__ __volatile__ \
("callsys # %0 %1 <= %2 %3 %4 %5 %6 %7 %8" \
: "+v"(_sc_0), "+r"(_sc_19), "+r"(_sc_16), \
"+r"(_sc_17), "+r"(_sc_18), "+r"(_sc_20), \
"+r"(_sc_21) \
: : inline_syscall_clobbers); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
/* Pointer mangling support. Note that tls access is slow enough that
we don't deoptimize things by placing the pointer check value there. */
#include <stdint.h>
#if defined NOT_IN_libc && defined IS_IN_rtld
# ifdef __ASSEMBLER__
# define PTR_MANGLE(dst, src, tmp) \
ldah tmp, __pointer_chk_guard_local($29) !gprelhigh; \
ldq tmp, __pointer_chk_guard_local(tmp) !gprellow; \
xor src, tmp, dst
# define PTR_MANGLE2(dst, src, tmp) \
xor src, tmp, dst
# define PTR_DEMANGLE(dst, tmp) PTR_MANGLE(dst, dst, tmp)
# define PTR_DEMANGLE2(dst, tmp) PTR_MANGLE2(dst, dst, tmp)
# else
extern uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden;
# define PTR_MANGLE(var) \
(var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard_local)
# define PTR_DEMANGLE(var) PTR_MANGLE(var)
# endif
#elif defined PIC
# ifdef __ASSEMBLER__
# define PTR_MANGLE(dst, src, tmp) \
ldq tmp, __pointer_chk_guard; \
xor src, tmp, dst
# define PTR_MANGLE2(dst, src, tmp) \
xor src, tmp, dst
# define PTR_DEMANGLE(dst, tmp) PTR_MANGLE(dst, dst, tmp)
# define PTR_DEMANGLE2(dst, tmp) PTR_MANGLE2(dst, dst, tmp)
# else
extern const uintptr_t __pointer_chk_guard attribute_relro;
# define PTR_MANGLE(var) \
(var) = (__typeof(var)) ((uintptr_t) (var) ^ __pointer_chk_guard)
# define PTR_DEMANGLE(var) PTR_MANGLE(var)
# endif
#else
/* There exists generic C code that assumes that PTR_MANGLE is always
defined. When generating code for the static libc, we don't have
__pointer_chk_guard defined. Nor is there any place that would
initialize it if it were defined, so there's little point in doing
anything more than nothing. */
# ifndef __ASSEMBLER__
# define PTR_MANGLE(var)
# define PTR_DEMANGLE(var)
# endif
#endif
#endif /* ASSEMBLER */
|
