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
|
/* Special support for trampolines
*
* Copyright (C) 1996, 1997, 2000, 2004, 2005 Free Software Foundation, Inc.
* Written By Michael Meissner
*
* This file is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* In addition to the permissions in the GNU General Public License, the
* Free Software Foundation gives you unlimited permission to link the
* compiled version of this file with other programs, and to distribute
* those programs without any restriction coming from the use of this
* file. (The General Public License restrictions do apply in other
* respects; for example, they cover modification of the file, and
* distribution when not linked into another program.)
*
* This file 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* As a special exception, if you link this library with files
* compiled with GCC to produce an executable, this does not cause the
* resulting executable to be covered by the GNU General Public License.
* This exception does not however invalidate any other reasons why the
* executable file might be covered by the GNU General Public License.
*/
#include "darwin-asm.h"
/* Set up trampolines. */
.text
.align LOG2_GPR_BYTES
Ltrampoline_initial:
mflr r0
bl 1f
Lfunc = .-Ltrampoline_initial
.g_long 0 /* will be replaced with function address */
Lchain = .-Ltrampoline_initial
.g_long 0 /* will be replaced with static chain */
1: mflr r11
lg r12,0(r11) /* function address */
mtlr r0
mtctr r12
lg r11,GPR_BYTES(r11) /* static chain */
bctr
trampoline_size = .-Ltrampoline_initial
/* R3 = stack address to store trampoline */
/* R4 = length of trampoline area */
/* R5 = function address */
/* R6 = static chain */
.globl ___trampoline_setup
___trampoline_setup:
mflr r0 /* save return address */
bcl 20,31,LCF0 /* load up __trampoline_initial into r7 */
LCF0:
mflr r11
addis r7,r11,ha16(LTRAMP-LCF0)
lg r7,lo16(LTRAMP-LCF0)(r7)
subi r7,r7,4
li r8,trampoline_size /* verify trampoline big enough */
cmpg cr1,r8,r4
srwi r4,r4,2 /* # words to move (insns always 4-byte) */
addi r9,r3,-4 /* adjust pointer for lgu */
mtctr r4
blt cr1,Labort
mtlr r0
/* Copy the instructions to the stack */
Lmove:
lwzu r10,4(r7)
stwu r10,4(r9)
bdnz Lmove
/* Store correct function and static chain */
stg r5,Lfunc(r3)
stg r6,Lchain(r3)
/* Now flush both caches */
mtctr r4
Lcache:
icbi 0,r3
dcbf 0,r3
addi r3,r3,4
bdnz Lcache
/* Finally synchronize things & return */
sync
isync
blr
Labort:
#ifdef __DYNAMIC__
bl L_abort$stub
.data
.section __TEXT,__picsymbolstub1,symbol_stubs,pure_instructions,32
.align 2
L_abort$stub:
.indirect_symbol _abort
mflr r0
bcl 20,31,L0$_abort
L0$_abort:
mflr r11
addis r11,r11,ha16(L_abort$lazy_ptr-L0$_abort)
mtlr r0
lgu r12,lo16(L_abort$lazy_ptr-L0$_abort)(r11)
mtctr r12
bctr
.data
.lazy_symbol_pointer
L_abort$lazy_ptr:
.indirect_symbol _abort
.g_long dyld_stub_binding_helper
#else
bl _abort
#endif
.data
.align LOG2_GPR_BYTES
LTRAMP:
.g_long Ltrampoline_initial
|
