aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/unix/sysv/linux/powerpc/powerpc32/getcontext.S
blob: 10211458d5e423ce176df6a6b1a602e6fe411b42 (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
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
393
394
395
396
397
398
399
400
/* Save current context.
   Copyright (C) 2002, 2004 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.  */

#include <sysdep.h>
#include <rtld-global-offsets.h>
#include <shlib-compat.h>

#define __ASSEMBLY__
#include <asm/ptrace.h>
#include "ucontext_i.h"

	.machine	"altivec"
ENTRY(__getcontext)
	stwu	r1,-16(r1)
/* Insure that the _UC_REGS start on a quadword boundary.  */
	stw	r3,_FRAME_PARM_SAVE1(r1)
	addi	r3,r3,_UC_REG_SPACE+12
	clrrwi  r3,r3,4

/* Save the general purpose registers */
	stw	r0,_UC_GREGS+(PT_R0*4)(r3)
	mflr	r0
	stw	r2,_UC_GREGS+(PT_R2*4)(r3)
	stw	r4,_UC_GREGS+(PT_R4*4)(r3)
/* Set the callers LR_SAVE, and the ucontext LR and NIP to the callers
   return address.  */
	stw	r0,_UC_GREGS+(PT_LNK*4)(r3)
	stw	r0,_UC_GREGS+(PT_NIP*4)(r3)
	stw	r0,_FRAME_LR_SAVE+16(r1)
	stw	r5,_UC_GREGS+(PT_R5*4)(r3)
	stw	r6,_UC_GREGS+(PT_R6*4)(r3)
	stw	r7,_UC_GREGS+(PT_R7*4)(r3)
	stw	r8,_UC_GREGS+(PT_R8*4)(r3)
	stw	r9,_UC_GREGS+(PT_R9*4)(r3)
	stw	r10,_UC_GREGS+(PT_R10*4)(r3)
	stw	r11,_UC_GREGS+(PT_R11*4)(r3)
	stw	r12,_UC_GREGS+(PT_R12*4)(r3)
	stw	r13,_UC_GREGS+(PT_R13*4)(r3)
	stw	r14,_UC_GREGS+(PT_R14*4)(r3)
	stw	r15,_UC_GREGS+(PT_R15*4)(r3)
	stw	r16,_UC_GREGS+(PT_R16*4)(r3)
	stw	r17,_UC_GREGS+(PT_R17*4)(r3)
	stw	r18,_UC_GREGS+(PT_R18*4)(r3)
	stw	r19,_UC_GREGS+(PT_R19*4)(r3)
	stw	r20,_UC_GREGS+(PT_R20*4)(r3)
	stw	r21,_UC_GREGS+(PT_R21*4)(r3)
	stw	r22,_UC_GREGS+(PT_R22*4)(r3)
	stw	r23,_UC_GREGS+(PT_R23*4)(r3)
	stw	r24,_UC_GREGS+(PT_R24*4)(r3)
	stw	r25,_UC_GREGS+(PT_R25*4)(r3)
	stw	r26,_UC_GREGS+(PT_R26*4)(r3)
	stw	r27,_UC_GREGS+(PT_R27*4)(r3)
	stw	r28,_UC_GREGS+(PT_R28*4)(r3)
	stw	r29,_UC_GREGS+(PT_R29*4)(r3)
	stw	r30,_UC_GREGS+(PT_R30*4)(r3)
	stw	r31,_UC_GREGS+(PT_R31*4)(r3)
/* Save the value of R1.  We had to push the stack before we
   had the address of uc_reg_space.  So compute the address of
   the callers stack pointer and save it as R1.  */
	addi	r8,r1,16
	li	r0,0
/* Save the count, exception and condition registers.  */
	mfctr	r11
	mfxer	r10
	mfcr	r9
	stw	r8,_UC_GREGS+(PT_R1*4)(r3)
	stw	r11,_UC_GREGS+(PT_CTR*4)(r3)
	stw	r10,_UC_GREGS+(PT_XER*4)(r3)
	stw	r9,_UC_GREGS+(PT_CCR*4)(r3)
/* Set the return value of getcontext to "success".  R3 is the only
   register whose value is not preserved in the saved context.  */
	stw	r0,_UC_GREGS+(PT_R3*4)(r3)

/* Zero fill fields that can't be set in user state. */
	stw	r0,_UC_GREGS+(PT_MSR*4)(r3)
	stw	r0,_UC_GREGS+(PT_MQ*4)(r3)

/* Save the floating-point registers */
	stfd	fp0,_UC_FREGS+(0*8)(r3)
	stfd	fp1,_UC_FREGS+(1*8)(r3)
	stfd	fp2,_UC_FREGS+(2*8)(r3)
	stfd	fp3,_UC_FREGS+(3*8)(r3)
	stfd	fp4,_UC_FREGS+(4*8)(r3)
	stfd	fp5,_UC_FREGS+(5*8)(r3)
	stfd	fp6,_UC_FREGS+(6*8)(r3)
	stfd	fp7,_UC_FREGS+(7*8)(r3)
	stfd	fp8,_UC_FREGS+(8*8)(r3)
	stfd	fp9,_UC_FREGS+(9*8)(r3)
	stfd	fp10,_UC_FREGS+(10*8)(r3)
	stfd	fp11,_UC_FREGS+(11*8)(r3)
	stfd	fp12,_UC_FREGS+(12*8)(r3)
	stfd	fp13,_UC_FREGS+(13*8)(r3)
	stfd	fp14,_UC_FREGS+(14*8)(r3)
	stfd	fp15,_UC_FREGS+(15*8)(r3)
	stfd	fp16,_UC_FREGS+(16*8)(r3)
	stfd	fp17,_UC_FREGS+(17*8)(r3)
	stfd	fp18,_UC_FREGS+(18*8)(r3)
	stfd	fp19,_UC_FREGS+(19*8)(r3)
	stfd	fp20,_UC_FREGS+(20*8)(r3)
	stfd	fp21,_UC_FREGS+(21*8)(r3)
	stfd	fp22,_UC_FREGS+(22*8)(r3)
	stfd	fp23,_UC_FREGS+(23*8)(r3)
	stfd	fp24,_UC_FREGS+(24*8)(r3)
	stfd	fp25,_UC_FREGS+(25*8)(r3)
	stfd	fp26,_UC_FREGS+(26*8)(r3)
	stfd	fp27,_UC_FREGS+(27*8)(r3)
	stfd	fp28,_UC_FREGS+(28*8)(r3)
	stfd	fp29,_UC_FREGS+(29*8)(r3)
	mffs	fp0
	stfd	fp30,_UC_FREGS+(30*8)(r3)
	stfd	fp31,_UC_FREGS+(31*8)(r3)
	stfd	fp0,_UC_FREGS+(32*8)(r3)

#ifdef PIC
	mflr    r8
# ifdef HAVE_ASM_PPC_REL16
	bcl	20,31,1f
1:	mflr	r7
	addis	r7,r7,_GLOBAL_OFFSET_TABLE_-1b@ha
	addi	r7,r7,_GLOBAL_OFFSET_TABLE_-1b@l
# else
	bl      _GLOBAL_OFFSET_TABLE_@local-4
	mflr    r7
# endif
# ifdef SHARED
	lwz     r7,_rtld_global_ro@got(r7)
	mtlr    r8
	lwz     r7,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET(r7)
# else
	lwz     r7,_dl_hwcap@got(r7)
	mtlr    r8
	lwz     r7,0(r7)
# endif
#else
	lis	r7,_dl_hwcap@ha
	lwz     r7,_dl_hwcap@l(r7)
#endif
	andis.	r7,r7,(PPC_FEATURE_HAS_ALTIVEC >> 16)

	la	r10,(_UC_VREGS)(r3)
	la	r9,(_UC_VREGS+16)(r3)
	
	beq	L(no_vec)
/* address of the combined VSCR/VSAVE quadword.  */	
	la	r8,(_UC_VREGS+512)(r3)

/* Save the vector registers */
	stvx  v0,0,r10
	stvx  v1,0,r9
	addi  r10,r10,32
	addi  r9,r9,32
/* We need to get the Vector Status and Control Register early to avoid
   store order problems later with the VSAVE register that shares the
   same quadword.  */
	mfvscr	v0

	stvx  v2,0,r10
	stvx  v3,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx	v0,0,r8
	
	stvx  v4,0,r10
	stvx  v5,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v6,0,r10
	stvx  v7,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v8,0,r10
	stvx  v9,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v10,0,r10
	stvx  v11,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v12,0,r10
	stvx  v13,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v14,0,r10
	stvx  v15,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v16,0,r10
	stvx  v17,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v18,0,r10
	stvx  v19,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v20,0,r10
	stvx  v21,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v22,0,r10
	stvx  v23,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v24,0,r10
	stvx  v25,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v26,0,r10
	stvx  v27,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v28,0,r10
	stvx  v29,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	mfspr	r0,VRSAVE
	stvx  v30,0,r10
	stvx  v31,0,r9

 	stw	r0,0(r8)

L(no_vec):
/* We need to set up parms and call sigprocmask which will clobber
   volatile registers. So before the call we need to retrieve the
   original ucontext ptr (parm1) from stack and store the UC_REGS_PTR
   (current R3).  */
	lwz	r12,_FRAME_PARM_SAVE1(r1)
	li	r4,0
	stw	r3,_UC_REGS_PTR(r12)
	addi	r5,r12,_UC_SIGMASK
	li	r3,SIG_BLOCK
	bl	__sigprocmask@local

	lwz	r0,_FRAME_LR_SAVE+16(r1)
	addi	r1,r1,16
	mtlr	r0
	blr
END(__getcontext)

versioned_symbol (libc, __getcontext, getcontext, GLIBC_2_3_4)

#if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)

	compat_text_section
ENTRY(__novec_getcontext)
	/*
	 * Since we are not attempting to save the altivec registers,
	 * there is no need to get the register storage space
	 * aligned on a 16-byte boundary.
	 */
	addi	r3,r3,_UC_REG_SPACE
	stw	r3,_UC_REGS_PTR - _UC_REG_SPACE(r3)
	stw	r0,_UC_GREGS+(PT_R0*4)(r3)
	stw	r1,_UC_GREGS+(PT_R1*4)(r3)
	mflr	r0
	stwu	r1,-16(r1)
	stw	r0,20(r1)
	stw	r0,_UC_GREGS+(PT_LNK*4)(r3)
	stw	r0,_UC_GREGS+(PT_NIP*4)(r3)
	stw	r2,_UC_GREGS+(PT_R2*4)(r3)
	stw	r4,_UC_GREGS+(PT_R4*4)(r3)
	stw	r5,_UC_GREGS+(PT_R5*4)(r3)
	stw	r6,_UC_GREGS+(PT_R6*4)(r3)
	stw	r7,_UC_GREGS+(PT_R7*4)(r3)
	stw	r8,_UC_GREGS+(PT_R8*4)(r3)
	stw	r9,_UC_GREGS+(PT_R9*4)(r3)
	stw	r10,_UC_GREGS+(PT_R10*4)(r3)
	stw	r11,_UC_GREGS+(PT_R11*4)(r3)
	stw	r12,_UC_GREGS+(PT_R12*4)(r3)
	stw	r13,_UC_GREGS+(PT_R13*4)(r3)
	stw	r14,_UC_GREGS+(PT_R14*4)(r3)
	stw	r15,_UC_GREGS+(PT_R15*4)(r3)
	stw	r16,_UC_GREGS+(PT_R16*4)(r3)
	stw	r17,_UC_GREGS+(PT_R17*4)(r3)
	stw	r18,_UC_GREGS+(PT_R18*4)(r3)
	stw	r19,_UC_GREGS+(PT_R19*4)(r3)
	stw	r20,_UC_GREGS+(PT_R20*4)(r3)
	stw	r21,_UC_GREGS+(PT_R21*4)(r3)
	stw	r22,_UC_GREGS+(PT_R22*4)(r3)
	stw	r23,_UC_GREGS+(PT_R23*4)(r3)
	stw	r24,_UC_GREGS+(PT_R24*4)(r3)
	stw	r25,_UC_GREGS+(PT_R25*4)(r3)
	stw	r26,_UC_GREGS+(PT_R26*4)(r3)
	stw	r27,_UC_GREGS+(PT_R27*4)(r3)
	stw	r28,_UC_GREGS+(PT_R28*4)(r3)
	stw	r29,_UC_GREGS+(PT_R29*4)(r3)
	stw	r30,_UC_GREGS+(PT_R30*4)(r3)
	stw	r31,_UC_GREGS+(PT_R31*4)(r3)
	mfctr	r0
	stw	r0,_UC_GREGS+(PT_CTR*4)(r3)
	mfxer	r0
	stw	r0,_UC_GREGS+(PT_XER*4)(r3)
	mfcr	r0
	stw	r0,_UC_GREGS+(PT_CCR*4)(r3)

	/* Set the return value of getcontext to "success".  R3 is the only
	   register whose value is not preserved in the saved context.  */
	li	r0,0
	stw	r0,_UC_GREGS+(PT_R3*4)(r3)

	/* Zero fill fields that can't be set in user state. */
	stw	r0,_UC_GREGS+(PT_MSR*4)(r3)
	stw	r0,_UC_GREGS+(PT_MQ*4)(r3)

	/* Save the floating-point registers */
	stfd	fp0,_UC_FREGS+(0*8)(r3)
	stfd	fp1,_UC_FREGS+(1*8)(r3)
	stfd	fp2,_UC_FREGS+(2*8)(r3)
	stfd	fp3,_UC_FREGS+(3*8)(r3)
	stfd	fp4,_UC_FREGS+(4*8)(r3)
	stfd	fp5,_UC_FREGS+(5*8)(r3)
	stfd	fp6,_UC_FREGS+(6*8)(r3)
	stfd	fp7,_UC_FREGS+(7*8)(r3)
	stfd	fp8,_UC_FREGS+(8*8)(r3)
	stfd	fp9,_UC_FREGS+(9*8)(r3)
	stfd	fp10,_UC_FREGS+(10*8)(r3)
	stfd	fp11,_UC_FREGS+(11*8)(r3)
	stfd	fp12,_UC_FREGS+(12*8)(r3)
	stfd	fp13,_UC_FREGS+(13*8)(r3)
	stfd	fp14,_UC_FREGS+(14*8)(r3)
	stfd	fp15,_UC_FREGS+(15*8)(r3)
	stfd	fp16,_UC_FREGS+(16*8)(r3)
	stfd	fp17,_UC_FREGS+(17*8)(r3)
	stfd	fp18,_UC_FREGS+(18*8)(r3)
	stfd	fp19,_UC_FREGS+(19*8)(r3)
	stfd	fp20,_UC_FREGS+(20*8)(r3)
	stfd	fp21,_UC_FREGS+(21*8)(r3)
	stfd	fp22,_UC_FREGS+(22*8)(r3)
	stfd	fp23,_UC_FREGS+(23*8)(r3)
	stfd	fp24,_UC_FREGS+(24*8)(r3)
	stfd	fp25,_UC_FREGS+(25*8)(r3)
	stfd	fp26,_UC_FREGS+(26*8)(r3)
	stfd	fp27,_UC_FREGS+(27*8)(r3)
	stfd	fp28,_UC_FREGS+(28*8)(r3)
	stfd	fp29,_UC_FREGS+(29*8)(r3)
	mffs	fp0
	stfd	fp30,_UC_FREGS+(30*8)(r3)
	stfd	fp31,_UC_FREGS+(31*8)(r3)
	stfd	fp0,_UC_FREGS+(32*8)(r3)

	addi	r5,r3,_UC_SIGMASK - _UC_REG_SPACE
	li	r4,0
	li	r3,SIG_BLOCK
	bl	__sigprocmask@local

	lwz	r0,20(r1)
	addi	r1,r1,16
	mtlr	r0
	blr
END(__novec_getcontext)
	.previous

compat_symbol (libc, __novec_getcontext, getcontext, GLIBC_2_3_3)

#endif

#if SHLIB_COMPAT (libc, GLIBC_2_1, GLIBC_2_3_3)

#define _ERRNO_H	1
#include <bits/errno.h>

	compat_text_section
ENTRY (__getcontext_stub)
	li	r3,ENOSYS
	b	__syscall_error@local
END (__getcontext_stub)
	.previous

compat_symbol (libc, __getcontext_stub, getcontext, GLIBC_2_1)

#endif