about summary refs log tree commit diff
path: root/sysdeps/s390/s390-64/dl-trampoline.h
blob: 6e5bad40459ec76552f6ab3e68bfb5da852fd650 (plain) (blame)
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
/* PLT trampolines.  s390x version.
   Copyright (C) 2016-2021 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, see
   <https://www.gnu.org/licenses/>.  */

/* The PLT stubs will call _dl_runtime_resolve/_dl_runtime_profile
 * with the following linkage:
 *   r2 - r6 : parameter registers
 *   f0, f2, f4, f6 : floating point parameter registers
 *   v24, v26, v28, v30, v25, v27, v29, v31 : vector parameter registers
 *   48(r15), 56(r15) : PLT arguments PLT1, PLT2
 *   160(r15) : additional stack parameters
 * The slightly tightened normal clobber rules for function calls apply:
 *   r0 : call saved (for __fentry__)
 *   r1 - r5 : call clobbered
 *   r6 - r13 :	 call saved
 *   r14 : return address (call clobbered)
 *   r15 : stack pointer (call saved)
 *   f0 - f7 : call clobbered
 *   f8 - f15 : call saved
 *   v0 - v7 : bytes 0-7 overlap with f0-f7: call clobbered
               bytes 8-15: call clobbered
 *   v8 - v15 : bytes 0-7 overlap with f8-f15: call saved
                bytes 8-15: call clobbered
 *   v16 - v31 : call clobbered
 */

#define CFA_OFF 160
#define FRAME_OFF CFA_OFF + FRAME_SIZE
#define V24_OFF -288
#define V25_OFF -272
#define V26_OFF -256
#define V27_OFF -240
#define V28_OFF -224
#define V29_OFF -208
#define V30_OFF -192
#define V31_OFF -176
#define R0_OFF -120
#define PLT1_OFF -112
#define PLT2_OFF -104
#define R2_OFF -96
#define R3_OFF -88
#define R4_OFF -80
#define R5_OFF -72
#define R14_OFF -64
#define R15_OFF -56
#define F0_OFF -48
#define F2_OFF -40
#define F4_OFF -32
#define F6_OFF -24
	.globl _dl_runtime_resolve
	.type _dl_runtime_resolve, @function
	cfi_startproc
	.align 16
_dl_runtime_resolve:
	stg    %r0,CFA_OFF+R0_OFF(%r15)
	cfi_offset (r0, R0_OFF)
	stmg   %r2,%r5,CFA_OFF+R2_OFF(%r15) # save registers
	cfi_offset (r2, R2_OFF)
	cfi_offset (r3, R3_OFF)
	cfi_offset (r4, R4_OFF)
	cfi_offset (r5, R5_OFF)
	stmg   %r14,%r15,CFA_OFF+R14_OFF(%r15)
	cfi_offset (r14, R14_OFF)
	cfi_offset (r15, R15_OFF)
	std    %f0,CFA_OFF+F0_OFF(%r15)
	cfi_offset (f0, F0_OFF)
	std    %f2,CFA_OFF+F2_OFF(%r15)
	cfi_offset (f2, F2_OFF)
	std    %f4,CFA_OFF+F4_OFF(%r15)
	cfi_offset (f4, F4_OFF)
	std    %f6,CFA_OFF+F6_OFF(%r15)
	cfi_offset (f6, F6_OFF)
	lmg    %r2,%r3,CFA_OFF+PLT1_OFF(%r15) # load args saved by PLT
	lgr    %r0,%r15
#ifdef RESTORE_VRS
# define FRAME_SIZE (CFA_OFF + 128)
	aghi   %r15,-FRAME_SIZE # create stack frame
	cfi_adjust_cfa_offset (FRAME_SIZE)
	.machine push
	.machine "z13"
	vstm   %v24,%v31,FRAME_OFF+V24_OFF(%r15) # save call-clobbered vr args
	cfi_offset (v24, V24_OFF)
	cfi_offset (v25, V25_OFF)
	cfi_offset (v26, V26_OFF)
	cfi_offset (v27, V27_OFF)
	cfi_offset (v28, V28_OFF)
	cfi_offset (v29, V29_OFF)
	cfi_offset (v30, V30_OFF)
	cfi_offset (v31, V31_OFF)
	.machine pop
#else
# define FRAME_SIZE CFA_OFF
	aghi   %r15,-FRAME_SIZE # create stack frame
	cfi_adjust_cfa_offset (FRAME_SIZE)
#endif
	stg    %r0,0(%r15)      # write backchain
	brasl  %r14,_dl_fixup	# call _dl_fixup
	lgr    %r1,%r2		# function addr returned in r2
#ifdef RESTORE_VRS
	.machine push
	.machine "z13"
	vlm    %v24,%v31,FRAME_OFF+V24_OFF(%r15) # restore vector registers
	.machine pop
#endif
	lmg    %r14,%r15,FRAME_OFF+R14_OFF(%r15) # restore frame and registers
#undef FRAME_SIZE
	cfi_def_cfa_offset (CFA_OFF)
	ld     %f0,CFA_OFF+F0_OFF(%r15)
	ld     %f2,CFA_OFF+F2_OFF(%r15)
	ld     %f4,CFA_OFF+F4_OFF(%r15)
	ld     %f6,CFA_OFF+F6_OFF(%r15)
	lmg    %r2,%r5,CFA_OFF+R2_OFF(%r15)
	lg     %r0,CFA_OFF+R0_OFF(%r15)
	br     %r1
	cfi_endproc
	.size _dl_runtime_resolve, .-_dl_runtime_resolve
#undef V24_OFF
#undef V25_OFF
#undef V26_OFF
#undef V27_OFF
#undef V28_OFF
#undef V29_OFF
#undef V30_OFF
#undef V31_OFF
#undef R0_OFF
#undef PLT1_OFF
#undef PLT2_OFF
#undef R2_OFF
#undef R3_OFF
#undef R4_OFF
#undef R5_OFF
#undef R14_OFF
#undef R15_OFF
#undef F0_OFF
#undef F2_OFF
#undef F4_OFF
#undef F6_OFF

#ifndef PROF
# define SIZEOF_STRUCT_LA_S390_64_REGS 200
# define REGS_OFF -360
# define R2_OFF -360
# define R3_OFF -352
# define R4_OFF -344
# define R5_OFF -336
# define R6_OFF -328
# define F0_OFF -320
# define F2_OFF -312
# define F4_OFF -304
# define F6_OFF -296
# define V24_OFF -288
# define V25_OFF -272
# define V26_OFF -256
# define V27_OFF -240
# define V28_OFF -224
# define V29_OFF -208
# define V30_OFF -192
# define V31_OFF -176
# define R0_OFF -144
# define R12_OFF -136
# define R14_OFF -128
# define FRAMESIZE_OFF -120
# define PLT1_OFF -112
# define PLT2_OFF -104
# define PREGS_OFF -96
# define RETVAL_OFF -88
# define RET_R2_OFF -88
# define RET_F0_OFF -80
# define RET_V24_OFF -72
	.globl _dl_runtime_profile
	.type _dl_runtime_profile, @function
	cfi_startproc
	.align 16
_dl_runtime_profile:
	stg     %r0,CFA_OFF+R0_OFF(%r15)
	cfi_offset (r0, R0_OFF)
	stg    %r12,CFA_OFF+R12_OFF(%r15)	# r12 is used as backup of r15
	cfi_offset (r12, R12_OFF)
	stg    %r14,CFA_OFF+R14_OFF(%r15)
	cfi_offset (r14, R14_OFF)
	lgr    %r12,%r15			# backup stack pointer
	cfi_def_cfa_register (12)
# define FRAME_SIZE (CFA_OFF + SIZEOF_STRUCT_LA_S390_64_REGS)
	aghi   %r15,-FRAME_SIZE			# create stack frame:
	stg    %r12,0(%r15)			# save backchain

	stmg   %r2,%r6,FRAME_OFF+R2_OFF(%r15)	# save call-clobbered arg regs
	cfi_offset (r2, R2_OFF)			# + r6 needed as arg for
	cfi_offset (r3, R3_OFF)			#  _dl_profile_fixup
	cfi_offset (r4, R4_OFF)
	cfi_offset (r5, R5_OFF)
	cfi_offset (r6, R6_OFF)
	std    %f0,FRAME_OFF+F0_OFF(%r15)
	cfi_offset (f0, F0_OFF)
	std    %f2,FRAME_OFF+F2_OFF(%r15)
	cfi_offset (f2, F2_OFF)
	std    %f4,FRAME_OFF+F4_OFF(%r15)
	cfi_offset (f4, F4_OFF)
	std    %f6,FRAME_OFF+F6_OFF(%r15)
	cfi_offset (f6, F6_OFF)
# ifdef RESTORE_VRS
	.machine push
	.machine "z13"
	vstm   %v24,%v31,FRAME_OFF+V24_OFF(%r15)	# store call-clobbered
	cfi_offset (v24, V24_OFF)			# vr arguments
	cfi_offset (v25, V25_OFF)
	cfi_offset (v26, V26_OFF)
	cfi_offset (v27, V27_OFF)
	cfi_offset (v28, V28_OFF)
	cfi_offset (v29, V29_OFF)
	cfi_offset (v30, V30_OFF)
	cfi_offset (v31, V31_OFF)
	.machine pop
# endif
	lmg    %r2,%r3,CFA_OFF+PLT1_OFF(%r12)	# load arguments saved by PLT
	lgr    %r4,%r14				# return address as 3rd parameter
	la     %r5,FRAME_OFF+REGS_OFF(%r15)	# struct La_s390_64_regs *
	la     %r6,CFA_OFF+FRAMESIZE_OFF(%r12)	# long int * framesize
	brasl  %r14,_dl_profile_fixup		# call resolver
	lgr    %r1,%r2				# function addr returned in r2
	ld     %f0,FRAME_OFF+F0_OFF(%r15)	# restore call-clobbered
	ld     %f2,FRAME_OFF+F2_OFF(%r15)	# arg fprs
	ld     %f4,FRAME_OFF+F4_OFF(%r15)
	ld     %f6,FRAME_OFF+F6_OFF(%r15)
# ifdef RESTORE_VRS
	.machine push
	.machine "z13"				# restore call-clobbered
	vlm    %v24,%v31,FRAME_OFF+V24_OFF(%r15)# arg vrs
	.machine pop
# endif
	lg     %r0,CFA_OFF+FRAMESIZE_OFF(%r12)	# load framesize
	ltgr   %r0,%r0
	jnm    1f
						# framesize < 0 means no
	lmg    %r2,%r6,FRAME_OFF+R2_OFF(%r15)	# pltexit call, so we can do a
						# tail call without copying the
						# arg overflow area
	lgr    %r15,%r12			# remove stack frame
	cfi_def_cfa_register (15)
	lg     %r14,CFA_OFF+R14_OFF(%r15)	# restore registers
	lg     %r12,CFA_OFF+R12_OFF(%r15)
	lg     %r0,CFA_OFF+R0_OFF(%r15)
	br     %r1				# tail call

	cfi_def_cfa_register (12)
1:	la     %r4,FRAME_OFF+REGS_OFF(%r15)	# struct La_s390_64_regs *
	stg    %r4,CFA_OFF+PREGS_OFF(%r12)
	jz     4f				# framesize == 0 ?
	aghi   %r0,7				# align framesize to 8
	nill   %r0,0xfff8
	slgr   %r15,%r0				# make room for framesize bytes
	stg    %r12,0(%r15)			# save backchain
	la     %r2,FRAME_OFF+REGS_OFF(%r15)
	la     %r3,CFA_OFF(%r12)
	srlg   %r0,%r0,3
3:	mvc    0(8,%r2),0(%r3)			# copy additional parameters
	la     %r2,8(%r2)			# depending on framesize
	la     %r3,8(%r3)
	brctg  %r0,3b
4:	lmg    %r2,%r6,0(%r4)			# load register parameters
	basr   %r14,%r1				# call resolved function
	stg    %r2,CFA_OFF+RET_R2_OFF(%r12)	# store return values r2, f0
	std    %f0,CFA_OFF+RET_F0_OFF(%r12)	# to struct La_s390_64_retval
# ifdef RESTORE_VRS
	.machine push
	.machine "z13"
	vst    %v24,CFA_OFF+RET_V24_OFF(%r12)	# store return value v24
	.machine pop
# endif
	lmg    %r2,%r4,CFA_OFF+PLT1_OFF(%r12)	# r2, r3: args saved by PLT
						# r4: struct La_s390_64_regs *
	la     %r5,CFA_OFF+RETVAL_OFF(%r12)	# struct La_s390_64_retval *
	brasl  %r14,_dl_audit_pltexit

	lgr    %r15,%r12			# remove stack frame
# undef FRAME_SIZE
	cfi_def_cfa_register (15)
	lg     %r14,CFA_OFF+R14_OFF(%r15)	# restore registers
	lg     %r12,CFA_OFF+R12_OFF(%r15)
	lg     %r0,CFA_OFF+R0_OFF(%r15)
	lg     %r2,CFA_OFF+RET_R2_OFF(%r15)	# restore return values
	ld     %f0,CFA_OFF+RET_F0_OFF(%r15)
# ifdef RESTORE_VRS
	.machine push
	.machine "z13"
	vl    %v24,CFA_OFF+RET_V24_OFF(%r15)	# restore return value v24
	.machine pop
# endif
	br     %r14			# Jump back to caller

	cfi_endproc
	.size _dl_runtime_profile, .-_dl_runtime_profile
# undef SIZEOF_STRUCT_LA_S390_64_REGS
# undef REGS_OFF
# undef R2_OFF
# undef R3_OFF
# undef R4_OFF
# undef R5_OFF
# undef R6_OFF
# undef F0_OFF
# undef F2_OFF
# undef F4_OFF
# undef F6_OFF
# undef V24_OFF
# undef V25_OFF
# undef V26_OFF
# undef V27_OFF
# undef V28_OFF
# undef V29_OFF
# undef V30_OFF
# undef V31_OFF
# undef R0_OFF
# undef R12_OFF
# undef R14_OFF
# undef FRAMESIZE_OFF
# undef PLT1_OFF
# undef PLT2_OFF
# undef PREGS_OFF
# undef RETVAL_OFF
# undef RET_R2_OFF
# undef RET_F0_OFF
# undef RET_V24_OFF
#endif