1 /* libunwind - a platform-independent unwind library 2 Copyright (C) 2003-2005 Hewlett-Packard Co 3 Contributed by David Mosberger-Tang <davidm (at) hpl.hp.com> 4 5 This file is part of libunwind. 6 7 Permission is hereby granted, free of charge, to any person obtaining 8 a copy of this software and associated documentation files (the 9 "Software"), to deal in the Software without restriction, including 10 without limitation the rights to use, copy, modify, merge, publish, 11 distribute, sublicense, and/or sell copies of the Software, and to 12 permit persons to whom the Software is furnished to do so, subject to 13 the following conditions: 14 15 The above copyright notice and this permission notice shall be 16 included in all copies or substantial portions of the Software. 17 18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 25 26 #include <limits.h> 27 #include <stdio.h> 28 29 #include "libunwind_i.h" 30 #include "libunwind-ptrace.h" 31 #include "map_info.h" 32 #include "os-linux.h" 33 34 /* ANDROID support update. */ 35 HIDDEN struct map_info * 36 map_create_list (int map_create_type, pid_t pid) 37 { 38 struct map_iterator mi; 39 unsigned long start, end, offset, flags; 40 struct map_info *map_list = NULL; 41 struct map_info *cur_map; 42 unw_addr_space_t as = NULL; 43 struct unw_addr_space* local_as = NULL; 44 void* as_arg = NULL; 45 46 if (maps_init (&mi, pid) < 0) 47 return NULL; 48 49 while (maps_next (&mi, &start, &end, &offset, &flags)) 50 { 51 cur_map = map_alloc_info (); 52 if (cur_map == MAP_FAILED) 53 break; 54 cur_map->next = map_list; 55 cur_map->start = start; 56 cur_map->end = end; 57 cur_map->offset = offset; 58 cur_map->load_base = 0; 59 cur_map->flags = flags; 60 cur_map->path = strdup (mi.path); 61 mutex_init (&cur_map->ei_lock); 62 cur_map->ei.valid = false; 63 cur_map->ei.load_attempted = false; 64 cur_map->ei.mapped = false; 65 cur_map->ei.mini_debug_info_data = NULL; 66 cur_map->ei.mini_debug_info_size = 0; 67 68 /* Indicate mapped memory of devices is special and should not 69 be read or written. Use a special flag instead of zeroing the 70 flags to indicate that the maps do not need to be rebuilt if 71 any values ever wind up in these special maps. 72 /dev/ashmem/... maps are special and don't have any restrictions, 73 so don't mark them as device memory. */ 74 if (strncmp ("/dev/", cur_map->path, 5) == 0 75 && strncmp ("ashmem/", cur_map->path + 5, 7) != 0) 76 cur_map->flags |= MAP_FLAGS_DEVICE_MEM; 77 78 /* If this is a readable executable map, and not a stack map or an 79 empty map, find the load_base. */ 80 if (cur_map->path[0] != '\0' && strncmp ("[stack:", cur_map->path, 7) != 0 81 && (flags & (PROT_EXEC | PROT_READ)) == (PROT_EXEC | PROT_READ) 82 && !(cur_map->flags & MAP_FLAGS_DEVICE_MEM)) 83 { 84 struct elf_image ei; 85 // Do not map elf for local unwinds, it's faster to read 86 // from memory directly. 87 if (map_create_type == UNW_MAP_CREATE_REMOTE 88 && elf_map_image (&ei, cur_map->path)) 89 { 90 unw_word_t load_base; 91 if (elf_w (get_load_base) (&ei, offset, &load_base)) 92 cur_map->load_base = load_base; 93 munmap (ei.u.mapped.image, ei.u.mapped.size); 94 } 95 else 96 { 97 // Create an address space right here with enough initialized 98 // to read data. 99 if (as == NULL) 100 { 101 if (map_create_type == UNW_MAP_CREATE_LOCAL) 102 { 103 // This is a very large structure, so allocate it. 104 if (local_as == NULL) 105 local_as = (struct unw_addr_space*) malloc(sizeof(*local_as)); 106 if (local_as != NULL) 107 { 108 as = local_as; 109 unw_local_access_addr_space_init (as); 110 } 111 } 112 else 113 { 114 // For a remote unwind, create the address space 115 // and arg data the first time we need it. 116 // We'll reuse these values if we need to attempt 117 // to get elf data for another map. 118 as = unw_create_addr_space (&_UPT_accessors, 0); 119 if (as) 120 { 121 as_arg = (void*) _UPT_create (pid); 122 if (!as_arg) 123 { 124 unw_destroy_addr_space (as); 125 as = NULL; 126 } 127 } 128 } 129 } 130 if (as) 131 { 132 ei.mapped = false; 133 ei.u.memory.start = cur_map->start; 134 ei.u.memory.end = cur_map->end; 135 ei.u.memory.as = as; 136 ei.u.memory.as_arg = as_arg; 137 ei.valid = elf_w (valid_object_memory) (&ei); 138 unw_word_t load_base; 139 if (ei.valid && elf_w (get_load_base) (&ei, cur_map->offset, &load_base)) 140 cur_map->load_base = load_base; 141 } 142 } 143 } 144 145 map_list = cur_map; 146 } 147 148 maps_close (&mi); 149 150 if (as && map_create_type == UNW_MAP_CREATE_REMOTE) 151 { 152 unw_destroy_addr_space (as); 153 _UPT_destroy (as_arg); 154 } 155 156 free(local_as); 157 158 return map_list; 159 } 160 /* End of ANDROID update. */ 161
