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a0c3f574 | 1 | /* KeyMgr backwards-compatibility support for Darwin. |
f1717362 | 2 | Copyright (C) 2001-2016 Free Software Foundation, Inc. |
a0c3f574 | 3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
6bc9506f | 8 | Software Foundation; either version 3, or (at your option) any later |
a0c3f574 | 9 | version. |
10 | ||
a0c3f574 | 11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
6bc9506f | 16 | Under Section 7 of GPL version 3, you are granted additional |
17 | permissions described in the GCC Runtime Library Exception, version | |
18 | 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | You should have received a copy of the GNU General Public License and | |
21 | a copy of the GCC Runtime Library Exception along with this program; | |
22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | <http://www.gnu.org/licenses/>. */ | |
a0c3f574 | 24 | |
25 | /* It is incorrect to include config.h here, because this file is being | |
26 | compiled for the target, and hence definitions concerning only the host | |
27 | do not apply. */ | |
28 | ||
29 | #include "tconfig.h" | |
30 | #include "tsystem.h" | |
31 | ||
0a80d498 | 32 | /* This file doesn't do anything useful on non-powerpc targets, since they |
33 | don't have backwards compatibility anyway. */ | |
34 | ||
35 | #ifdef __ppc__ | |
36 | ||
a0c3f574 | 37 | /* Homemade decls substituting for getsect.h and dyld.h, so cross |
38 | compilation works. */ | |
39 | struct mach_header; | |
40 | extern char *getsectdatafromheader (struct mach_header *, const char *, | |
41 | const char *, unsigned long *); | |
42 | extern void _dyld_register_func_for_add_image | |
43 | (void (*) (struct mach_header *, unsigned long)); | |
44 | extern void _dyld_register_func_for_remove_image | |
45 | (void (*) (struct mach_header *, unsigned long)); | |
46 | ||
47 | extern void __darwin_gcc3_preregister_frame_info (void); | |
48 | ||
49 | /* These are from "keymgr.h". */ | |
50 | extern void _init_keymgr (void); | |
51 | extern void *_keymgr_get_and_lock_processwide_ptr (unsigned key); | |
52 | extern void _keymgr_set_and_unlock_processwide_ptr (unsigned key, void *ptr); | |
53 | ||
54 | extern void *__keymgr_global[]; | |
55 | typedef struct _Sinfo_Node { | |
56 | unsigned int size ; /*size of this node*/ | |
57 | unsigned short major_version ; /*API major version.*/ | |
58 | unsigned short minor_version ; /*API minor version.*/ | |
59 | } _Tinfo_Node ; | |
60 | ||
61 | /* KeyMgr 3.x is the first one supporting GCC3 stuff natively. */ | |
62 | #define KEYMGR_API_MAJOR_GCC3 3 | |
63 | /* ... with these keys. */ | |
64 | #define KEYMGR_GCC3_LIVE_IMAGE_LIST 301 /* loaded images */ | |
65 | #define KEYMGR_GCC3_DW2_OBJ_LIST 302 /* Dwarf2 object list */ | |
66 | ||
67 | /* Node of KEYMGR_GCC3_LIVE_IMAGE_LIST. Info about each resident image. */ | |
68 | struct live_images { | |
69 | unsigned long this_size; /* sizeof (live_images) */ | |
70 | struct mach_header *mh; /* the image info */ | |
71 | unsigned long vm_slide; | |
72 | void (*destructor)(struct live_images *); /* destructor for this */ | |
73 | struct live_images *next; | |
74 | unsigned int examined_p; | |
75 | void *fde; | |
76 | void *object_info; | |
77 | unsigned long info[2]; /* Future use. */ | |
78 | }; | |
79 | ||
80 | \f | |
81 | /* These routines are used only on Darwin versions before 10.2. | |
82 | Later versions have equivalent code in the system. | |
83 | Eventually, they might go away, although it might be a long time... */ | |
84 | ||
85 | static void darwin_unwind_dyld_remove_image_hook | |
86 | (struct mach_header *m, unsigned long s); | |
87 | static void darwin_unwind_dyld_remove_image_hook | |
88 | (struct mach_header *m, unsigned long s); | |
89 | extern void __darwin_gcc3_preregister_frame_info (void); | |
90 | ||
91 | static void | |
92 | darwin_unwind_dyld_add_image_hook (struct mach_header *mh, unsigned long slide) | |
93 | { | |
94 | struct live_images *l = (struct live_images *)calloc (1, sizeof (*l)); | |
95 | l->mh = mh; | |
96 | l->vm_slide = slide; | |
97 | l->this_size = sizeof (*l); | |
98 | l->next = (struct live_images *) | |
99 | _keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST); | |
100 | _keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, l); | |
101 | } | |
102 | ||
103 | static void | |
104 | darwin_unwind_dyld_remove_image_hook (struct mach_header *m, unsigned long s) | |
105 | { | |
106 | struct live_images *top, **lip, *destroy = NULL; | |
107 | ||
108 | /* Look for it in the list of live images and delete it. */ | |
109 | ||
110 | top = (struct live_images *) | |
111 | _keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST); | |
112 | for (lip = ⊤ *lip != NULL; lip = &(*lip)->next) | |
113 | { | |
114 | if ((*lip)->mh == m && (*lip)->vm_slide == s) | |
115 | { | |
116 | destroy = *lip; | |
117 | *lip = destroy->next; /* unlink DESTROY */ | |
118 | ||
119 | if (destroy->this_size != sizeof (*destroy)) /* sanity check */ | |
120 | abort (); | |
121 | ||
122 | break; | |
123 | } | |
124 | } | |
125 | _keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, top); | |
126 | ||
127 | /* Now that we have unlinked this from the image list, toss it. */ | |
128 | if (destroy != NULL) | |
129 | { | |
130 | if (destroy->destructor != NULL) | |
131 | (*destroy->destructor) (destroy); | |
132 | free (destroy); | |
133 | } | |
134 | } | |
135 | ||
136 | void | |
137 | __darwin_gcc3_preregister_frame_info (void) | |
138 | { | |
139 | const _Tinfo_Node *info; | |
140 | _init_keymgr (); | |
141 | info = (_Tinfo_Node *)__keymgr_global[2]; | |
142 | if (info != NULL) | |
143 | { | |
144 | if (info->major_version >= KEYMGR_API_MAJOR_GCC3) | |
145 | return; | |
146 | /* Otherwise, use our own add_image_hooks. */ | |
147 | } | |
148 | ||
149 | _dyld_register_func_for_add_image (darwin_unwind_dyld_add_image_hook); | |
150 | _dyld_register_func_for_remove_image (darwin_unwind_dyld_remove_image_hook); | |
151 | } | |
0a80d498 | 152 | |
153 | #endif /* __ppc__ */ |