about summary refs log tree commit diff
path: root/sysdeps/aarch64/dl-trampoline.S
blob: 63ef6f734203c46e304a1fd319c1994bab78dca8 (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
/* Copyright (C) 2005-2016 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
   <http://www.gnu.org/licenses/>.  */

#include <sysdep.h>
#include <libc-symbols.h>

#include "dl-link.h"

#define ip0 x16
#define ip0l PTR_REG (16)
#define ip1 x17
#define lr  x30

/* RELA relocatons are 3 pointers */
#define RELA_SIZE (PTR_SIZE * 3)

	.text
	.globl _dl_runtime_resolve
	.type _dl_runtime_resolve, #function
	cfi_startproc
	.align 2
_dl_runtime_resolve:
	/* AArch64 we get called with:
	   ip0		&PLTGOT[2]
	   ip1		temp(dl resolver entry point)
	   [sp, #8]	lr
	   [sp, #0]	&PLTGOT[n]
	 */

	cfi_rel_offset (lr, 8)

	/* Save arguments.  */
	stp	x8, x9, [sp, #-(80+8*16)]!
	cfi_adjust_cfa_offset (80+8*16)
	cfi_rel_offset (x8, 0)
	cfi_rel_offset (x9, 8)

	stp	x6, x7, [sp,  #16]
	cfi_rel_offset (x6, 16)
	cfi_rel_offset (x7, 24)

	stp	x4, x5, [sp,  #32]
	cfi_rel_offset (x4, 32)
	cfi_rel_offset (x5, 40)

	stp	x2, x3, [sp,  #48]
	cfi_rel_offset (x2, 48)
	cfi_rel_offset (x3, 56)

	stp	x0, x1, [sp,  #64]
	cfi_rel_offset (x0, 64)
	cfi_rel_offset (x1, 72)

	stp	q0, q1, [sp, #(80+0*16)]
	cfi_rel_offset (q0, 80+0*16)
	cfi_rel_offset (q1, 80+1*16)

	stp	q2, q3, [sp, #(80+2*16)]
	cfi_rel_offset (q0, 80+2*16)
	cfi_rel_offset (q1, 80+3*16)

	stp	q4, q5, [sp, #(80+4*16)]
	cfi_rel_offset (q0, 80+4*16)
	cfi_rel_offset (q1, 80+5*16)

	stp	q6, q7, [sp, #(80+6*16)]
	cfi_rel_offset (q0, 80+6*16)
	cfi_rel_offset (q1, 80+7*16)

	/* Get pointer to linker struct.  */
	ldr	PTR_REG (0), [ip0, #-PTR_SIZE]

	/* Prepare to call _dl_fixup().  */
	ldr	x1, [sp, 80+8*16]	/* Recover &PLTGOT[n] */

	sub     x1, x1, ip0
	add     x1, x1, x1, lsl #1
	lsl     x1, x1, #3
	sub     x1, x1, #(RELA_SIZE<<3)
	lsr     x1, x1, #3

	/* Call fixup routine.  */
	bl	_dl_fixup

	/* Save the return.  */
	mov	ip0, x0

	/* Get arguments and return address back.  */
	ldp	q0, q1, [sp, #(80+0*16)]
	ldp	q2, q3, [sp, #(80+2*16)]
	ldp	q4, q5, [sp, #(80+4*16)]
	ldp	q6, q7, [sp, #(80+6*16)]
	ldp	x0, x1, [sp, #64]
	ldp	x2, x3, [sp, #48]
	ldp	x4, x5, [sp, #32]
	ldp	x6, x7, [sp, #16]
	ldp	x8, x9, [sp], #(80+8*16)
	cfi_adjust_cfa_offset (-(80+8*16))

	ldp	ip1, lr, [sp], #16
	cfi_adjust_cfa_offset (-16)

	/* Jump to the newly found address.  */
	br	ip0

	cfi_endproc
	.size _dl_runtime_resolve, .-_dl_runtime_resolve
#ifndef PROF
	.globl _dl_runtime_profile
	.type _dl_runtime_profile, #function
	cfi_startproc
	.align 2
_dl_runtime_profile:
	/* AArch64 we get called with:
	   ip0		&PLTGOT[2]
	   ip1		temp(dl resolver entry point)
	   [sp, #8]	lr
	   [sp, #0]	&PLTGOT[n]

	   Stack frame layout:
	   [sp,   #...] lr
	   [sp,   #...] &PLTGOT[n]
	   [sp,    #96] La_aarch64_regs
	   [sp,    #48] La_aarch64_retval
	   [sp,    #40] frame size return from pltenter
	   [sp,    #32] dl_profile_call saved x1
	   [sp,    #24] dl_profile_call saved x0
	   [sp,    #16] t1
	   [sp,     #0] x29, lr   <- x29
	 */

# define OFFSET_T1		16
# define OFFSET_SAVED_CALL_X0	OFFSET_T1 + 8
# define OFFSET_FS		OFFSET_SAVED_CALL_X0 + 16
# define OFFSET_RV		OFFSET_FS + 8
# define OFFSET_RG		OFFSET_RV + DL_SIZEOF_RV

# define SF_SIZE		OFFSET_RG + DL_SIZEOF_RG

# define OFFSET_PLTGOTN		SF_SIZE
# define OFFSET_LR		OFFSET_PLTGOTN + 8

	/* Save arguments.  */
	sub	sp, sp, #SF_SIZE
	cfi_adjust_cfa_offset (SF_SIZE)
	stp	x29, x30, [SP, #0]
	mov	x29, sp
	cfi_def_cfa_register (x29)
	cfi_rel_offset (x29, 0)
	cfi_rel_offset (lr, 8)

	stp	x0, x1, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*0]
	cfi_rel_offset (x0, OFFSET_RG + DL_OFFSET_RG_X0 + 16*0 + 0)
	cfi_rel_offset (x1, OFFSET_RG + DL_OFFSET_RG_X0 + 16*0 + 8)
	stp	x2, x3, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*1]
	cfi_rel_offset (x2, OFFSET_RG + DL_OFFSET_RG_X0 + 16*1 + 0)
	cfi_rel_offset (x3, OFFSET_RG + DL_OFFSET_RG_X0 + 16*1 + 8)
	stp	x4, x5, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*2]
	cfi_rel_offset (x4, OFFSET_RG + DL_OFFSET_RG_X0 + 16*2 + 0)
	cfi_rel_offset (x5, OFFSET_RG + DL_OFFSET_RG_X0 + 16*2 + 8)
	stp	x6, x7, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*3]
	cfi_rel_offset (x6, OFFSET_RG + DL_OFFSET_RG_X0 + 16*3 + 0)
	cfi_rel_offset (x7, OFFSET_RG + DL_OFFSET_RG_X0 + 16*3 + 8)

	stp	d0, d1, [X29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*0]
	cfi_rel_offset (d0, OFFSET_RG + DL_OFFSET_RG_D0 + 16*0)
	cfi_rel_offset (d1, OFFSET_RG + DL_OFFSET_RG_D0 + 16*0 + 8)
	stp	d2, d3, [X29, #OFFSET_RG+ DL_OFFSET_RG_D0 + 16*1]
	cfi_rel_offset (d2, OFFSET_RG + DL_OFFSET_RG_D0 + 16*1 + 0)
	cfi_rel_offset (d3, OFFSET_RG + DL_OFFSET_RG_D0 + 16*1 + 8)
	stp	d4, d5, [X29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*2]
	cfi_rel_offset (d4, OFFSET_RG + DL_OFFSET_RG_D0 + 16*2 + 0)
	cfi_rel_offset (d5, OFFSET_RG + DL_OFFSET_RG_D0 + 16*2 + 8)
	stp	d6, d7, [X29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*3]
	cfi_rel_offset (d6, OFFSET_RG + DL_OFFSET_RG_D0 + 16*3 + 0)
	cfi_rel_offset (d7, OFFSET_RG + DL_OFFSET_RG_D0 + 16*3 + 8)

	add     x0, x29, #SF_SIZE + 16
	ldr	x1, [x29, #OFFSET_LR]
	stp	x0, x1, [x29, #OFFSET_RG + DL_OFFSET_RG_SP]

	/* Get pointer to linker struct.  */
	ldr	PTR_REG (0), [ip0, #-PTR_SIZE]

	/* Prepare to call _dl_profile_fixup().  */
	ldr	x1, [x29, OFFSET_PLTGOTN]	/* Recover &PLTGOT[n] */

	sub     x1, x1, ip0
	add     x1, x1, x1, lsl #1
	lsl     x1, x1, #3
	sub     x1, x1, #(RELA_SIZE<<3)
	lsr     x1, x1, #3

	stp	x0, x1, [x29, #OFFSET_SAVED_CALL_X0]

	/* Set up extra args for _dl_profile_fixup */
	ldr	x2, [x29, #OFFSET_LR]		/* load saved LR */
	add	x3, x29, #OFFSET_RG		/* address of La_aarch64_reg */
	add	x4, x29, #OFFSET_FS		/* address of framesize */
	bl	_dl_profile_fixup

	ldr	ip0l, [x29, #OFFSET_FS]		/* framesize == 0 */
	cmp	ip0l, #0
	bge	1f
	cfi_remember_state

	/* Save the return.  */
	mov	ip0, x0

	/* Get arguments and return address back.  */
	ldp	x0, x1, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*0]
	ldp	x2, x3, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*1]
	ldp	x4, x5, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*2]
	ldp	x6, x7, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*3]
	ldp	d0, d1, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*0]
	ldp	d2, d3, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*1]
	ldp	d4, d5, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*2]
	ldp	d6, d7, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*3]

	cfi_def_cfa_register (sp)
	ldp	x29, x30, [x29, #0]
	cfi_restore(x29)
	cfi_restore(x30)

	add	sp, sp, SF_SIZE + 16
	cfi_adjust_cfa_offset (- SF_SIZE - 16)

	/* Jump to the newly found address.  */
	br	ip0

	cfi_restore_state
1:
	/* The new frame size is in ip0.  */

	sub	PTR_REG (1), PTR_REG (29), ip0l
	and	sp, x1, #0xfffffffffffffff0

	str	x0, [x29, #OFFSET_T1]

	mov	x0, sp
	add	x1, x29, #SF_SIZE + 16
	mov	x2, ip0
	bl	memcpy

	ldr	ip0, [x29, #OFFSET_T1]

	/* Call the function.  */
	ldp	x0, x1, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*0]
	ldp	x2, x3, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*1]
	ldp	x4, x5, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*2]
	ldp	x6, x7, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*3]
	ldp	d0, d1, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*0]
	ldp	d2, d3, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*1]
	ldp	d4, d5, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*2]
	ldp	d6, d7, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*3]
	blr	ip0
	stp	x0, x1, [x29, #OFFSET_RV + DL_OFFSET_RV_X0]
	stp	d0, d1, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*0]
	stp	d2, d3, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*1]

	/* Setup call to pltexit  */
	ldp	x0, x1, [x29, #OFFSET_SAVED_CALL_X0]
	add	x2, x29, #OFFSET_RG
	add	x3, x29, #OFFSET_RV
	bl	_dl_call_pltexit

	ldp	x0, x1, [x29, #OFFSET_RV + DL_OFFSET_RV_X0]
	ldp	d0, d1, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*0]
	ldp	d2, d3, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*1]
	/* LR from within La_aarch64_reg */
	ldr	lr, [x29, #OFFSET_RG + DL_OFFSET_RG_LR]
	cfi_restore(lr)
	mov	sp, x29
	cfi_def_cfa_register (sp)
	ldr	x29, [x29, #0]
	cfi_restore(x29)
	add	sp, sp, SF_SIZE + 16
	cfi_adjust_cfa_offset (- SF_SIZE - 16)

	br	lr

	cfi_endproc
	.size _dl_runtime_profile, .-_dl_runtime_profile
#endif
	.previous