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
|
/* PLT trampolines. hppa version.
Copyright (C) 2005-2020 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/>. */
#include <sysdep.h>
/* This code gets called via the .plt stub, and is used in
dl-runtime.c to call the `_dl_fixup' function and then redirect
to the address it returns. `_dl_fixup' takes two arguments, however
`_dl_profile_fixup' takes a number of parameters for use with
library auditing (LA).
WARNING: This template is also used by gcc's __cffc, and expects
that the "bl" for _dl_runtime_resolve exist at a particular offset.
Do not change this template without changing gcc, while the prefix
"bl" should fix everything so gcc finds the right spot, it will
slow down __cffc when it attempts to call fixup to resolve function
descriptor references. Please refer to gcc/gcc/config/pa/fptr.c
Enter with r19 = reloc offset, r20 = got-8, r21 = fixup ltp. */
/* RELOCATION MARKER: bl to provide gcc's __cffc with fixup loc. */
.text
/* THIS CODE DOES NOT EXECUTE */
bl _dl_fixup, %r2
.text
.global _dl_runtime_resolve
.type _dl_runtime_resolve,@function
cfi_startproc
.align 4
_dl_runtime_resolve:
.PROC
.CALLINFO FRAME=128,CALLS,SAVE_RP,ENTRY_GR=3
.ENTRY
/* SAVE_RP says we do */
stw %rp, -20(%sp)
/* Save static link register */
stw %r29,-16(%sp)
/* Save argument registers */
stw %r26,-36(%sp)
stw %r25,-40(%sp)
stw %r24,-44(%sp)
stw %r23,-48(%sp)
/* Build a call frame, and save structure pointer. */
copy %sp, %r1 /* Copy previous sp */
/* Save function result address (on entry) */
stwm %r28,128(%sp)
/* Fillin some frame info to follow ABI */
stw %r1,-4(%sp) /* Previous sp */
stw %r21,-32(%sp) /* PIC register value */
/* Save input floating point registers. This must be done
in the new frame since the previous frame doesn't have
enough space */
ldo -56(%sp),%r1
fstd,ma %fr4,-8(%r1)
fstd,ma %fr5,-8(%r1)
fstd,ma %fr6,-8(%r1)
fstd,ma %fr7,-8(%r1)
/* Set up args to fixup func, needs only two arguments */
ldw 8+4(%r20),%r26 /* (1) got[1] == struct link_map */
copy %r19,%r25 /* (2) reloc offset */
/* Call the real address resolver. */
bl _dl_fixup,%rp
copy %r21,%r19 /* set fixup func ltp */
/* While the linker will set a function pointer to NULL when it
encounters an undefined weak function, we need to dynamically
detect removed weak functions. The issue arises because a weak
__gmon_start__ function was added to shared executables to work
around issues in _init that are now resolved. The presence of
__gmon_start__ in every shared library breaks the linker
`--as-needed' option. This __gmon_start__ function does nothing
but removal is tricky. Depending on the binding, removal can
cause an application using it to fault. The call to _dl_fixup
returns NULL when a function isn't resolved. In order to help
with __gmon_start__ removal, we return directly to the caller
when _dl_fixup returns NULL. This check could be removed when
BZ 19170 is fixed. */
comib,= 0,%r28,1f
/* Load up the returned func descriptor */
copy %r28, %r22
copy %r29, %r19
/* Reload arguments fp args */
ldo -56(%sp),%r1
fldd,ma -8(%r1),%fr4
fldd,ma -8(%r1),%fr5
fldd,ma -8(%r1),%fr6
fldd,ma -8(%r1),%fr7
/* Adjust sp, and restore function result address*/
ldwm -128(%sp),%r28
/* Reload static link register */
ldw -16(%sp),%r29
/* Reload general args */
ldw -36(%sp),%r26
ldw -40(%sp),%r25
ldw -44(%sp),%r24
ldw -48(%sp),%r23
/* Jump to new function, but return to previous function */
bv %r0(%r22)
ldw -20(%sp),%rp
1:
/* Return to previous function */
ldw -148(%sp),%rp
bv %r0(%rp)
ldo -128(%sp),%sp
.EXIT
.PROCEND
cfi_endproc
.size _dl_runtime_resolve, . - _dl_runtime_resolve
.text
.global _dl_runtime_profile
.type _dl_runtime_profile,@function
cfi_startproc
.align 4
_dl_runtime_profile:
.PROC
.CALLINFO FRAME=192,CALLS,SAVE_RP,ENTRY_GR=3
.ENTRY
/* SAVE_RP says we do */
stw %rp, -20(%sp)
/* Save static link register */
stw %r29,-16(%sp)
/* Build a call frame, and save structure pointer. */
copy %sp, %r1 /* Copy previous sp */
/* Save function result address (on entry) */
stwm %r28,192(%sp)
/* Fillin some frame info to follow ABI */
stw %r1,-4(%sp) /* Previous sp */
stw %r21,-32(%sp) /* PIC register value */
/* Create La_hppa_retval */
/* -140, lrv_r28
-136, lrv_r29
-132, 4 byte pad
-128, lr_fr4 (8 bytes) */
/* Create save space for _dl_profile_fixup arguments
-120, Saved reloc offset
-116, Saved struct link_map
-112, *framesizep */
/* Create La_hppa_regs */
/* 32-bit registers */
stw %r26,-108(%sp)
stw %r25,-104(%sp)
stw %r24,-100(%sp)
stw %r23,-96(%sp)
/* -92, 4 byte pad */
/* 64-bit floating point registers */
ldo -88(%sp),%r1
fstd,ma %fr4,8(%r1)
fstd,ma %fr5,8(%r1)
fstd,ma %fr6,8(%r1)
fstd,ma %fr7,8(%r1)
/* 32-bit stack pointer and return register */
stw %sp,-56(%sp)
stw %r2,-52(%sp)
/* Set up args to fixup func, needs five arguments */
ldw 8+4(%r20),%r26 /* (1) got[1] == struct link_map */
stw %r26,-116(%sp) /* Save struct link_map */
copy %r19,%r25 /* (2) reloc offset */
stw %r25,-120(%sp) /* Save reloc offset */
copy %rp,%r24 /* (3) profile_fixup needs rp */
ldo -56(%sp),%r23 /* (4) La_hppa_regs */
ldo -112(%sp), %r1
stw %r1, -52(%sp) /* (5) long int *framesizep */
/* Call the real address resolver. */
bl _dl_profile_fixup,%rp
copy %r21,%r19 /* set fixup func ltp */
/* Load up the returned function descriptor */
copy %r28, %r22
copy %r29, %r19
/* Restore gr/fr/sp/rp */
ldw -108(%sp),%r26
ldw -104(%sp),%r25
ldw -100(%sp),%r24
ldw -96(%sp),%r23
/* -92, 4 byte pad, skip */
ldo -88(%sp),%r1
fldd,ma 8(%r1),%fr4
fldd,ma 8(%r1),%fr5
fldd,ma 8(%r1),%fr6
fldd,ma 8(%r1),%fr7
ldw -52(%sp),%rp
/* Reload static link register -(192+16) without adjusting stack */
ldw -208(%sp),%r29
/* *framesizep is >= 0 if we have to run pltexit */
ldw -112(%sp),%r28
cmpb,>>=,N %r0,%r28,L(cpe)
/* Adjust sp, and restore function result address*/
ldwm -192(%sp),%r28
/* Jump to new function, but return to previous function */
bv %r0(%r22)
ldw -20(%sp),%rp
/* NO RETURN */
L(nf):
/* Call the returned function descriptor */
bv %r0(%r22)
nop
b,n L(cont)
L(cpe):
/* We are going to call the resolved function, but we have a
stack frame in the middle. We use the value of framesize to
guess how much extra frame we need, and how much frame to
copy forward. */
/* Round to nearest multiple of 64 */
addi 63, %r28, %r28
depi 0, 27, 6, %r28
/* Calcualte start of stack copy */
ldo -192(%sp),%r2
/* Increate the stack by *framesizep */
copy %sp, %r1
add %sp, %r28, %sp
/* Save stack pointer */
stw %r1, -4(%sp)
/* Single byte copy of prevous stack onto newly allocated stack */
1: ldb %r28(%r2), %r1
add %r28, %sp, %r26
stb %r1, 0(%r26)
addi,< -1,%r28,%r28
b,n 1b
/* Retore r28 and r27 and r2 already points at -192(%sp) */
ldw 0(%r2),%r28
ldw 84(%r2),%r26
/* Calculate address of L(cont) */
b,l L(nf),%r2
depwi 0,31,2,%r2
L(cont):
/* Undo fake stack */
ldw -4(%sp),%r1
copy %r1, %sp
/* Arguments to _dl_call_pltexit */
ldw -116(%sp), %r26 /* (1) got[1] == struct link_map */
ldw -120(%sp), %r25 /* (2) reloc offsets */
ldo -56(%sp), %r24 /* (3) *La_hppa_regs */
ldo -124(%sp), %r23 /* (4) *La_hppa_retval */
/* Fill *La_hppa_retval */
stw %r28,-140(%sp)
stw %r29,-136(%sp)
ldo -128(%sp), %r1
fstd %fr4,0(%r1)
/* Call _dl_call_pltexit */
bl _dl_call_pltexit,%rp
nop
/* Restore *La_hppa_retval */
ldw -140(%sp), %r28
ldw -136(%sp), %r29
ldo -128(%sp), %r1
fldd 0(%r1), %fr4
/* Unwind the stack */
ldo 192(%sp),%sp
/* Retore callers rp */
ldw -20(%sp),%rp
/* Return */
bv,n 0(%r2)
.EXIT
.PROCEND
cfi_endproc
.size _dl_runtime_profile, . - _dl_runtime_profile
|
