libunwind_i.h revision 0eba2169fb19ef0707a2c96201e33769001b5f11
1/* libunwind - a platform-independent unwind library 2 Copyright (C) 2008 CodeSourcery 3 4This file is part of libunwind. 5 6Permission is hereby granted, free of charge, to any person obtaining 7a copy of this software and associated documentation files (the 8"Software"), to deal in the Software without restriction, including 9without limitation the rights to use, copy, modify, merge, publish, 10distribute, sublicense, and/or sell copies of the Software, and to 11permit persons to whom the Software is furnished to do so, subject to 12the following conditions: 13 14The above copyright notice and this permission notice shall be 15included in all copies or substantial portions of the Software. 16 17THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 19MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 20NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 21LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 22OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 23WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 24 25#ifndef ARM_LIBUNWIND_I_H 26#define ARM_LIBUNWIND_I_H 27 28/* Target-dependent definitions that are internal to libunwind but need 29 to be shared with target-independent code. */ 30 31#include <stdlib.h> 32#include <libunwind.h> 33 34#include "elf32.h" 35#include "mempool.h" 36#include "dwarf.h" 37#include "ex_tables.h" 38 39typedef struct 40 { 41 /* no arm-specific fast trace */ 42 } 43unw_tdep_frame_t; 44 45struct unw_addr_space 46 { 47 struct unw_accessors acc; 48 int big_endian; 49 unw_caching_policy_t caching_policy; 50#ifdef HAVE_ATOMIC_OPS_H 51 AO_t cache_generation; 52#else 53 uint32_t cache_generation; 54#endif 55 unw_word_t dyn_generation; /* see dyn-common.h */ 56 unw_word_t dyn_info_list_addr; /* (cached) dyn_info_list_addr */ 57 struct dwarf_rs_cache global_cache; 58 struct unw_debug_frame_list *debug_frames; 59 }; 60 61struct cursor 62 { 63 struct dwarf_cursor dwarf; /* must be first */ 64 enum 65 { 66 ARM_SCF_NONE, /* no signal frame */ 67 ARM_SCF_LINUX_SIGFRAME, /* non-RT signal frame, kernel >=2.6.18 */ 68 ARM_SCF_LINUX_RT_SIGFRAME, /* RT signal frame, kernel >=2.6.18 */ 69 ARM_SCF_LINUX_OLD_SIGFRAME, /* non-RT signal frame, kernel < 2.6.18 */ 70 ARM_SCF_LINUX_OLD_RT_SIGFRAME /* RT signal frame, kernel < 2.6.18 */ 71 } 72 sigcontext_format; 73 unw_word_t sigcontext_addr; 74 unw_word_t sigcontext_sp; 75 unw_word_t sigcontext_pc; 76 }; 77 78#define DWARF_GET_LOC(l) ((l).val) 79 80#ifdef UNW_LOCAL_ONLY 81# define DWARF_NULL_LOC DWARF_LOC (0, 0) 82# define DWARF_IS_NULL_LOC(l) (DWARF_GET_LOC (l) == 0) 83# define DWARF_LOC(r, t) ((dwarf_loc_t) { .val = (r) }) 84# define DWARF_IS_REG_LOC(l) 0 85# define DWARF_REG_LOC(c,r) (DWARF_LOC((unw_word_t) \ 86 tdep_uc_addr((c)->as_arg, (r)), 0)) 87# define DWARF_MEM_LOC(c,m) DWARF_LOC ((m), 0) 88# define DWARF_FPREG_LOC(c,r) (DWARF_LOC((unw_word_t) \ 89 tdep_uc_addr((c)->as_arg, (r)), 0)) 90 91static inline int 92dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val) 93{ 94 if (!DWARF_GET_LOC (loc)) 95 return -1; 96 *val = *(unw_fpreg_t *) DWARF_GET_LOC (loc); 97 return 0; 98} 99 100static inline int 101dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val) 102{ 103 if (!DWARF_GET_LOC (loc)) 104 return -1; 105 *(unw_fpreg_t *) DWARF_GET_LOC (loc) = val; 106 return 0; 107} 108 109static inline int 110dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val) 111{ 112 if (!DWARF_GET_LOC (loc)) 113 return -1; 114 *val = *(unw_word_t *) DWARF_GET_LOC (loc); 115 return 0; 116} 117 118static inline int 119dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val) 120{ 121 if (!DWARF_GET_LOC (loc)) 122 return -1; 123 *(unw_word_t *) DWARF_GET_LOC (loc) = val; 124 return 0; 125} 126 127#else /* !UNW_LOCAL_ONLY */ 128# define DWARF_LOC_TYPE_FP (1 << 0) 129# define DWARF_LOC_TYPE_REG (1 << 1) 130# define DWARF_NULL_LOC DWARF_LOC (0, 0) 131# define DWARF_IS_NULL_LOC(l) \ 132 ({ dwarf_loc_t _l = (l); _l.val == 0 && _l.type == 0; }) 133# define DWARF_LOC(r, t) ((dwarf_loc_t) { .val = (r), .type = (t) }) 134# define DWARF_IS_REG_LOC(l) (((l).type & DWARF_LOC_TYPE_REG) != 0) 135# define DWARF_IS_FP_LOC(l) (((l).type & DWARF_LOC_TYPE_FP) != 0) 136# define DWARF_REG_LOC(c,r) DWARF_LOC((r), DWARF_LOC_TYPE_REG) 137# define DWARF_MEM_LOC(c,m) DWARF_LOC ((m), 0) 138# define DWARF_FPREG_LOC(c,r) DWARF_LOC((r), (DWARF_LOC_TYPE_REG \ 139 | DWARF_LOC_TYPE_FP)) 140 141static inline int 142dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val) 143{ 144 char *valp = (char *) &val; 145 unw_word_t addr; 146 int ret; 147 148 if (DWARF_IS_NULL_LOC (loc)) 149 return -UNW_EBADREG; 150 151 if (DWARF_IS_REG_LOC (loc)) 152 return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc), 153 val, 0, c->as_arg); 154 155 addr = DWARF_GET_LOC (loc); 156 if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp, 157 0, c->as_arg)) < 0) 158 return ret; 159 160 return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1, 0, 161 c->as_arg); 162} 163 164static inline int 165dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val) 166{ 167 char *valp = (char *) &val; 168 unw_word_t addr; 169 int ret; 170 171 if (DWARF_IS_NULL_LOC (loc)) 172 return -UNW_EBADREG; 173 174 if (DWARF_IS_REG_LOC (loc)) 175 return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc), 176 &val, 1, c->as_arg); 177 178 addr = DWARF_GET_LOC (loc); 179 if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp, 180 1, c->as_arg)) < 0) 181 return ret; 182 183 return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1, 184 1, c->as_arg); 185} 186 187static inline int 188dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val) 189{ 190 if (DWARF_IS_NULL_LOC (loc)) 191 return -UNW_EBADREG; 192 193 /* If a code-generator were to save a value of type unw_word_t in a 194 floating-point register, we would have to support this case. I 195 suppose it could happen with MMX registers, but does it really 196 happen? */ 197 assert (!DWARF_IS_FP_LOC (loc)); 198 199 if (DWARF_IS_REG_LOC (loc)) 200 return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), val, 201 0, c->as_arg); 202 else 203 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val, 204 0, c->as_arg); 205} 206 207static inline int 208dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val) 209{ 210 if (DWARF_IS_NULL_LOC (loc)) 211 return -UNW_EBADREG; 212 213 /* If a code-generator were to save a value of type unw_word_t in a 214 floating-point register, we would have to support this case. I 215 suppose it could happen with MMX registers, but does it really 216 happen? */ 217 assert (!DWARF_IS_FP_LOC (loc)); 218 219 if (DWARF_IS_REG_LOC (loc)) 220 return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), &val, 221 1, c->as_arg); 222 else 223 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val, 224 1, c->as_arg); 225} 226 227#endif /* !UNW_LOCAL_ONLY */ 228 229#define tdep_getcontext_trace unw_getcontext 230#define tdep_needs_initialization UNW_OBJ(needs_initialization) 231#define tdep_init UNW_OBJ(init) 232#define arm_find_proc_info UNW_OBJ(find_proc_info) 233#define arm_put_unwind_info UNW_OBJ(put_unwind_info) 234/* Platforms that support UNW_INFO_FORMAT_TABLE need to define 235 tdep_search_unwind_table. */ 236#define tdep_search_unwind_table UNW_OBJ(search_unwind_table) 237#define tdep_uc_addr UNW_ARCH_OBJ(uc_addr) 238#define tdep_get_elf_image UNW_ARCH_OBJ(get_elf_image) 239#define tdep_access_reg UNW_OBJ(access_reg) 240#define tdep_access_fpreg UNW_OBJ(access_fpreg) 241#define tdep_fetch_frame(c,ip,n) do {} while(0) 242#define tdep_cache_frame(c,rs) do {} while(0) 243#define tdep_reuse_frame(c,rs) do {} while(0) 244#define tdep_stash_frame(c,rs) do {} while(0) 245#define tdep_trace(cur,addr,n) (-UNW_ENOINFO) 246 247#ifdef UNW_LOCAL_ONLY 248# define tdep_find_proc_info(c,ip,n) \ 249 arm_find_proc_info((c)->as, (ip), &(c)->pi, (n), \ 250 (c)->as_arg) 251# define tdep_put_unwind_info(as,pi,arg) \ 252 arm_put_unwind_info((as), (pi), (arg)) 253#else 254# define tdep_find_proc_info(c,ip,n) \ 255 (*(c)->as->acc.find_proc_info)((c)->as, (ip), &(c)->pi, (n), \ 256 (c)->as_arg) 257# define tdep_put_unwind_info(as,pi,arg) \ 258 (*(as)->acc.put_unwind_info)((as), (pi), (arg)) 259#endif 260 261#define tdep_get_as(c) ((c)->dwarf.as) 262#define tdep_get_as_arg(c) ((c)->dwarf.as_arg) 263#define tdep_get_ip(c) ((c)->dwarf.ip) 264#define tdep_big_endian(as) ((as)->big_endian) 265 266extern int tdep_needs_initialization; 267 268extern void tdep_init (void); 269extern int arm_find_proc_info (unw_addr_space_t as, unw_word_t ip, 270 unw_proc_info_t *pi, int need_unwind_info, 271 void *arg); 272extern void arm_put_unwind_info (unw_addr_space_t as, 273 unw_proc_info_t *pi, void *arg); 274extern int tdep_search_unwind_table (unw_addr_space_t as, unw_word_t ip, 275 unw_dyn_info_t *di, unw_proc_info_t *pi, 276 int need_unwind_info, void *arg); 277extern void *tdep_uc_addr (unw_tdep_context_t *uc, int reg); 278extern int tdep_get_elf_image (struct elf_image *ei, pid_t pid, unw_word_t ip, 279 unsigned long *segbase, unsigned long *mapoff, 280 char *path, size_t pathlen); 281extern int tdep_access_reg (struct cursor *c, unw_regnum_t reg, 282 unw_word_t *valp, int write); 283extern int tdep_access_fpreg (struct cursor *c, unw_regnum_t reg, 284 unw_fpreg_t *valp, int write); 285 286/* unwinding method selection support */ 287#define UNW_ARM_METHOD_ALL 0xFF 288#define UNW_ARM_METHOD_DWARF 0x01 289#define UNW_ARM_METHOD_FRAME 0x02 290#define UNW_ARM_METHOD_EXIDX 0x04 291 292#define unwi_unwind_method UNW_OBJ(unwind_method) 293extern int unwi_unwind_method; 294 295#define UNW_TRY_METHOD(x) (unwi_unwind_method & x) 296 297#endif /* ARM_LIBUNWIND_I_H */ 298