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; 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 as = &local_as; 104 unw_local_access_addr_space_init (as); 105 } 106 else 107 { 108 // For a remote unwind, create the address space 109 // and arg data the first time we need it. 110 // We'll reuse these values if we need to attempt 111 // to get elf data for another map. 112 as = unw_create_addr_space (&_UPT_accessors, 0); 113 if (as) 114 { 115 as_arg = (void*) _UPT_create (pid); 116 if (!as_arg) 117 { 118 unw_destroy_addr_space (as); 119 as = NULL; 120 } 121 } 122 } 123 } 124 if (as) 125 { 126 ei.mapped = false; 127 ei.u.memory.start = cur_map->start; 128 ei.u.memory.end = cur_map->end; 129 ei.u.memory.as = as; 130 ei.u.memory.as_arg = as_arg; 131 ei.valid = elf_w (valid_object_memory) (&ei); 132 unw_word_t load_base; 133 if (ei.valid && elf_w (get_load_base) (&ei, cur_map->offset, &load_base)) 134 cur_map->load_base = load_base; 135 } 136 } 137 } 138 139 map_list = cur_map; 140 } 141 142 maps_close (&mi); 143 144 if (as && map_create_type == UNW_MAP_CREATE_REMOTE) 145 { 146 unw_destroy_addr_space (as); 147 _UPT_destroy (as_arg); 148 } 149 150 return map_list; 151 } 152 /* End of ANDROID update. */ 153
