1 /* libunwind - a platform-independent unwind library 2 Copyright (C) 2008 CodeSourcery 3 4 This file is part of libunwind. 5 6 Permission is hereby granted, free of charge, to any person obtaining 7 a copy of this software and associated documentation files (the 8 "Software"), to deal in the Software without restriction, including 9 without limitation the rights to use, copy, modify, merge, publish, 10 distribute, sublicense, and/or sell copies of the Software, and to 11 permit persons to whom the Software is furnished to do so, subject to 12 the following conditions: 13 14 The above copyright notice and this permission notice shall be 15 included in all copies or substantial portions of the Software. 16 17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 20 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 21 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 22 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 23 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 24 25 #include <stdlib.h> 26 #include <string.h> 27 28 #include "unwind_i.h" 29 30 #ifdef UNW_REMOTE_ONLY 31 32 /* unw_local_addr_space is a NULL pointer in this case. */ 33 PROTECTED unw_addr_space_t unw_local_addr_space; 34 35 #else /* !UNW_REMOTE_ONLY */ 36 37 static struct unw_addr_space local_addr_space; 38 39 PROTECTED unw_addr_space_t unw_local_addr_space = &local_addr_space; 40 41 static inline void * 42 uc_addr (unw_tdep_context_t *uc, int reg) 43 { 44 if (reg >= UNW_ARM_R0 && reg < UNW_ARM_R0 + 16) 45 return &uc->regs[reg - UNW_ARM_R0]; 46 else 47 return NULL; 48 } 49 50 # ifdef UNW_LOCAL_ONLY 51 52 HIDDEN void * 53 tdep_uc_addr (unw_tdep_context_t *uc, int reg) 54 { 55 return uc_addr (uc, reg); 56 } 57 58 # endif /* UNW_LOCAL_ONLY */ 59 60 HIDDEN unw_dyn_info_list_t _U_dyn_info_list; 61 62 /* XXX fix me: there is currently no way to locate the dyn-info list 63 by a remote unwinder. On ia64, this is done via a special 64 unwind-table entry. Perhaps something similar can be done with 65 DWARF2 unwind info. */ 66 67 static int 68 get_dyn_info_list_addr (unw_addr_space_t as, unw_word_t *dyn_info_list_addr, 69 void *arg) 70 { 71 *dyn_info_list_addr = (unw_word_t) &_U_dyn_info_list; 72 return 0; 73 } 74 75 static int 76 access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write, 77 void *arg) 78 { 79 if (write) 80 { 81 /* ANDROID support update. */ 82 #ifdef UNW_LOCAL_ONLY 83 if (map_local_is_writable (addr, sizeof(unw_word_t))) 84 { 85 #endif 86 Debug (16, "mem[%x] <- %x\n", addr, *val); 87 *(unw_word_t *) addr = *val; 88 #ifdef UNW_LOCAL_ONLY 89 } 90 else 91 { 92 Debug (16, "Unwritable memory mem[%x] <- %x\n", addr, *val); 93 return -1; 94 } 95 #endif 96 /* End of ANDROID update. */ 97 } 98 else 99 { 100 /* ANDROID support update. */ 101 #ifdef UNW_LOCAL_ONLY 102 if (map_local_is_readable (addr, sizeof(unw_word_t))) 103 { 104 #endif 105 *val = *(unw_word_t *) addr; 106 Debug (16, "mem[%x] -> %x\n", addr, *val); 107 #ifdef UNW_LOCAL_ONLY 108 } 109 else 110 { 111 Debug (16, "Unreadable memory mem[%x] -> XXX\n", addr); 112 return -1; 113 } 114 #endif 115 /* End of ANDROID update. */ 116 } 117 return 0; 118 } 119 120 static int 121 access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write, 122 void *arg) 123 { 124 unw_word_t *addr; 125 unw_tdep_context_t *uc = arg; 126 127 if (unw_is_fpreg (reg)) 128 goto badreg; 129 130 Debug (16, "reg = %s\n", unw_regname (reg)); 131 if (!(addr = uc_addr (uc, reg))) 132 goto badreg; 133 134 if (write) 135 { 136 *(unw_word_t *) addr = *val; 137 Debug (12, "%s <- %x\n", unw_regname (reg), *val); 138 } 139 else 140 { 141 *val = *(unw_word_t *) addr; 142 Debug (12, "%s -> %x\n", unw_regname (reg), *val); 143 } 144 return 0; 145 146 badreg: 147 Debug (1, "bad register number %u\n", reg); 148 return -UNW_EBADREG; 149 } 150 151 static int 152 access_fpreg (unw_addr_space_t as, unw_regnum_t reg, unw_fpreg_t *val, 153 int write, void *arg) 154 { 155 unw_tdep_context_t *uc = arg; 156 unw_fpreg_t *addr; 157 158 if (!unw_is_fpreg (reg)) 159 goto badreg; 160 161 if (!(addr = uc_addr (uc, reg))) 162 goto badreg; 163 164 if (write) 165 { 166 Debug (12, "%s <- %08lx.%08lx.%08lx\n", unw_regname (reg), 167 ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]); 168 *(unw_fpreg_t *) addr = *val; 169 } 170 else 171 { 172 *val = *(unw_fpreg_t *) addr; 173 Debug (12, "%s -> %08lx.%08lx.%08lx\n", unw_regname (reg), 174 ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]); 175 } 176 return 0; 177 178 badreg: 179 Debug (1, "bad register number %u\n", reg); 180 /* attempt to access a non-preserved register */ 181 return -UNW_EBADREG; 182 } 183 184 static int 185 get_static_proc_name (unw_addr_space_t as, unw_word_t ip, 186 char *buf, size_t buf_len, unw_word_t *offp, 187 void *arg) 188 { 189 return _Uelf32_get_proc_name (as, getpid (), ip, buf, buf_len, offp, arg); 190 } 191 192 static int 193 access_mem_unrestricted (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, 194 int write, void *arg) 195 { 196 if (write) 197 return -1; 198 199 *val = *(unw_word_t *) addr; 200 Debug (16, "mem[%x] -> %x\n", addr, *val); 201 return 0; 202 } 203 204 // This initializes just enough of the address space to call the 205 // access memory function. 206 PROTECTED void 207 unw_local_access_addr_space_init (unw_addr_space_t as) 208 { 209 memset (as, 0, sizeof (*as)); 210 as->acc.access_mem = access_mem_unrestricted; 211 } 212 213 HIDDEN void 214 arm_local_addr_space_init (void) 215 { 216 memset (&local_addr_space, 0, sizeof (local_addr_space)); 217 local_addr_space.caching_policy = UNW_CACHE_GLOBAL; 218 local_addr_space.acc.find_proc_info = arm_find_proc_info; 219 local_addr_space.acc.put_unwind_info = arm_put_unwind_info; 220 local_addr_space.acc.get_dyn_info_list_addr = get_dyn_info_list_addr; 221 local_addr_space.acc.access_mem = access_mem; 222 local_addr_space.acc.access_reg = access_reg; 223 local_addr_space.acc.access_fpreg = access_fpreg; 224 local_addr_space.acc.resume = arm_local_resume; 225 local_addr_space.acc.get_proc_name = get_static_proc_name; 226 unw_flush_cache (&local_addr_space, 0, 0); 227 228 map_local_init (); 229 } 230 231 #endif /* !UNW_REMOTE_ONLY */ 232
