headers/libs/libunwind/tdep-x86/libunwind_i.h

   1 /* libunwind - a platform-independent unwind library
   2    Copyright (C) 2002-2005 Hewlett-Packard Co
   3         Contributed by David Mosberger-Tang <davidm@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 #ifndef X86_LIBUNWIND_I_H
  27 #define X86_LIBUNWIND_I_H
  28
  29 /* Target-dependent definitions that are internal to libunwind but need
  30    to be shared with target-independent code.  */
  31
  32 #include <stdlib.h>
  33 #include <libunwind.h>
  34
  35 #include "elf32.h"
  36 #include "mempool.h"
  37 #include "dwarf.h"
  38
  39 typedef struct
  40   {
  41     /* no x86-specific fast trace */
  42   }
  43 unw_tdep_frame_t;
  44
  45 struct unw_addr_space
  46   {
  47     struct unw_accessors acc;
  48     unw_caching_policy_t caching_policy;
  49 #ifdef HAVE_ATOMIC_OPS_H
  50     AO_t cache_generation;
  51 #else
  52     uint32_t cache_generation;
  53 #endif
  54     unw_word_t dyn_generation;          /* see dyn-common.h */
  55     unw_word_t dyn_info_list_addr;      /* (cached) dyn_info_list_addr */
  56     struct dwarf_rs_cache global_cache;
  57     struct unw_debug_frame_list *debug_frames;
  58    };
  59
  60 struct cursor
  61   {
  62     struct dwarf_cursor dwarf;          /* must be first */
  63
  64     /* Format of sigcontext structure and address at which it is
  65        stored: */
  66     enum
  67       {
  68         X86_SCF_NONE,                   /* no signal frame encountered */
  69         X86_SCF_LINUX_SIGFRAME,         /* Linux x86 sigcontext */
  70         X86_SCF_LINUX_RT_SIGFRAME,      /* POSIX ucontext_t */
  71         X86_SCF_FREEBSD_SIGFRAME,       /* FreeBSD x86 sigcontext */
  72         X86_SCF_FREEBSD_SIGFRAME4,      /* FreeBSD 4.x x86 sigcontext */
  73         X86_SCF_FREEBSD_OSIGFRAME,      /* FreeBSD pre-4.x x86 sigcontext */
  74         X86_SCF_FREEBSD_SYSCALL,        /* FreeBSD x86 syscall */
  75       }
  76     sigcontext_format;
  77     unw_word_t sigcontext_addr;
  78     int validate;
  79     ucontext_t *uc;
  80   };
  81
  82 static inline ucontext_t *
  83 dwarf_get_uc(const struct dwarf_cursor *cursor)
  84 {
  85   const struct cursor *c = (struct cursor *) cursor->as_arg;
  86   return c->uc;
  87 }
  88
  89 #define DWARF_GET_LOC(l)        ((l).val)
  90
  91 #ifdef UNW_LOCAL_ONLY
  92 # define DWARF_NULL_LOC         DWARF_LOC (0, 0)
  93 # define DWARF_IS_NULL_LOC(l)   (DWARF_GET_LOC (l) == 0)
  94 # define DWARF_LOC(r, t)        ((dwarf_loc_t) { .val = (r) })
  95 # define DWARF_IS_REG_LOC(l)    0
  96 # define DWARF_REG_LOC(c,r)     (DWARF_LOC((unw_word_t)                      \
  97                                  tdep_uc_addr(dwarf_get_uc(c), (r)), 0))
  98 # define DWARF_MEM_LOC(c,m)     DWARF_LOC ((m), 0)
  99 # define DWARF_FPREG_LOC(c,r)   (DWARF_LOC((unw_word_t)                      \
 100                                  tdep_uc_addr(dwarf_get_uc(c), (r)), 0))
 101
 102 static inline int
 103 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val)
 104 {
 105   if (!DWARF_GET_LOC (loc))
 106     return -1;
 107   *val = *(unw_fpreg_t *) DWARF_GET_LOC (loc);
 108   return 0;
 109 }
 110
 111 static inline int
 112 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
 113 {
 114   if (!DWARF_GET_LOC (loc))
 115     return -1;
 116   *(unw_fpreg_t *) DWARF_GET_LOC (loc) = val;
 117   return 0;
 118 }
 119
 120 static inline int
 121 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val)
 122 {
 123   if (!DWARF_GET_LOC (loc))
 124     return -1;
 125   return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
 126                                    0, c->as_arg);
 127 }
 128
 129 static inline int
 130 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
 131 {
 132   if (!DWARF_GET_LOC (loc))
 133     return -1;
 134   return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val,
 135                                    1, c->as_arg);
 136 }
 137
 138 #else /* !UNW_LOCAL_ONLY */
 139 # define DWARF_LOC_TYPE_FP      (1 << 0)
 140 # define DWARF_LOC_TYPE_REG     (1 << 1)
 141 # define DWARF_NULL_LOC         DWARF_LOC (0, 0)
 142 # define DWARF_IS_NULL_LOC(l)                                           \
 143                 ({ dwarf_loc_t _l = (l); _l.val == 0 && _l.type == 0; })
 144 # define DWARF_LOC(r, t)        ((dwarf_loc_t) { .val = (r), .type = (t) })
 145 # define DWARF_IS_REG_LOC(l)    (((l).type & DWARF_LOC_TYPE_REG) != 0)
 146 # define DWARF_IS_FP_LOC(l)     (((l).type & DWARF_LOC_TYPE_FP) != 0)
 147 # define DWARF_REG_LOC(c,r)     DWARF_LOC((r), DWARF_LOC_TYPE_REG)
 148 # define DWARF_MEM_LOC(c,m)     DWARF_LOC ((m), 0)
 149 # define DWARF_FPREG_LOC(c,r)   DWARF_LOC((r), (DWARF_LOC_TYPE_REG      \
 150                                                 | DWARF_LOC_TYPE_FP))
 151
 152 static inline int
 153 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val)
 154 {
 155   char *valp = (char *) &val;
 156   unw_word_t addr;
 157   int ret;
 158
 159   if (DWARF_IS_NULL_LOC (loc))
 160     return -UNW_EBADREG;
 161
 162   if (DWARF_IS_REG_LOC (loc))
 163     return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
 164                                        val, 0, c->as_arg);
 165
 166   addr = DWARF_GET_LOC (loc);
 167   if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp,
 168                                        0, c->as_arg)) < 0)
 169     return ret;
 170
 171   return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1, 0,
 172                                    c->as_arg);
 173 }
 174
 175 static inline int
 176 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
 177 {
 178   char *valp = (char *) &val;
 179   unw_word_t addr;
 180   int ret;
 181
 182   if (DWARF_IS_NULL_LOC (loc))
 183     return -UNW_EBADREG;
 184
 185   if (DWARF_IS_REG_LOC (loc))
 186     return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
 187                                        &val, 1, c->as_arg);
 188
 189   addr = DWARF_GET_LOC (loc);
 190   if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp,
 191                                        1, c->as_arg)) < 0)
 192     return ret;
 193
 194   return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1,
 195                                    1, c->as_arg);
 196 }
 197
 198 static inline int
 199 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val)
 200 {
 201   if (DWARF_IS_NULL_LOC (loc))
 202     return -UNW_EBADREG;
 203
 204   /* If a code-generator were to save a value of type unw_word_t in a
 205      floating-point register, we would have to support this case.  I
 206      suppose it could happen with MMX registers, but does it really
 207      happen?  */
 208   assert (!DWARF_IS_FP_LOC (loc));
 209
 210   if (DWARF_IS_REG_LOC (loc))
 211     return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), val,
 212                                      0, c->as_arg);
 213   else
 214     return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
 215                                      0, c->as_arg);
 216 }
 217
 218 static inline int
 219 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
 220 {
 221   if (DWARF_IS_NULL_LOC (loc))
 222     return -UNW_EBADREG;
 223
 224   /* If a code-generator were to save a value of type unw_word_t in a
 225      floating-point register, we would have to support this case.  I
 226      suppose it could happen with MMX registers, but does it really
 227      happen?  */
 228   assert (!DWARF_IS_FP_LOC (loc));
 229
 230   if (DWARF_IS_REG_LOC (loc))
 231     return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), &val,
 232                                      1, c->as_arg);
 233   else
 234     return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val,
 235                                      1, c->as_arg);
 236 }
 237
 238 #endif /* !UNW_LOCAL_ONLY */
 239
 240 #define tdep_getcontext_trace           unw_getcontext
 241 #define tdep_init_done                  UNW_OBJ(init_done)
 242 #define tdep_init                       UNW_OBJ(init)
 243 /* Platforms that support UNW_INFO_FORMAT_TABLE need to define
 244    tdep_search_unwind_table.  */
 245 #define tdep_search_unwind_table        dwarf_search_unwind_table
 246 #define tdep_find_unwind_table          dwarf_find_unwind_table
 247 #define tdep_uc_addr                    UNW_ARCH_OBJ(uc_addr)
 248 #define tdep_get_elf_image              UNW_ARCH_OBJ(get_elf_image)
 249 #define tdep_access_reg                 UNW_OBJ(access_reg)
 250 #define tdep_access_fpreg               UNW_OBJ(access_fpreg)
 251 #define tdep_fetch_frame(c,ip,n)        do {} while(0)
 252 #define tdep_cache_frame(c,rs)          do {} while(0)
 253 #define tdep_reuse_frame(c,rs)          do {} while(0)
 254 #define tdep_stash_frame(c,rs)          do {} while(0)
 255 #define tdep_trace(cur,addr,n)          (-UNW_ENOINFO)
 256
 257 #ifdef UNW_LOCAL_ONLY
 258 # define tdep_find_proc_info(c,ip,n)                            \
 259         dwarf_find_proc_info((c)->as, (ip), &(c)->pi, (n),      \
 260                                        (c)->as_arg)
 261 # define tdep_put_unwind_info(as,pi,arg)                \
 262         dwarf_put_unwind_info((as), (pi), (arg))
 263 #else
 264 # define tdep_find_proc_info(c,ip,n)                                    \
 265         (*(c)->as->acc.find_proc_info)((c)->as, (ip), &(c)->pi, (n),    \
 266                                        (c)->as_arg)
 267 # define tdep_put_unwind_info(as,pi,arg)                \
 268         (*(as)->acc.put_unwind_info)((as), (pi), (arg))
 269 #endif
 270
 271 #define tdep_get_as(c)                  ((c)->dwarf.as)
 272 #define tdep_get_as_arg(c)              ((c)->dwarf.as_arg)
 273 #define tdep_get_ip(c)                  ((c)->dwarf.ip)
 274 #define tdep_big_endian(as)             0
 275
 276 extern int tdep_init_done;
 277
 278 extern void tdep_init (void);
 279 extern int tdep_search_unwind_table (unw_addr_space_t as, unw_word_t ip,
 280                                      unw_dyn_info_t *di, unw_proc_info_t *pi,
 281                                      int need_unwind_info, void *arg);
 282 extern void *tdep_uc_addr (ucontext_t *uc, int reg);
 283 extern int tdep_get_elf_image (struct elf_image *ei, pid_t pid, unw_word_t ip,
 284                                unsigned long *segbase, unsigned long *mapoff,
 285                                char *path, size_t pathlen);
 286 extern int tdep_access_reg (struct cursor *c, unw_regnum_t reg,
 287                             unw_word_t *valp, int write);
 288 extern int tdep_access_fpreg (struct cursor *c, unw_regnum_t reg,
 289                               unw_fpreg_t *valp, int write);
 290
 291 #endif /* X86_LIBUNWIND_I_H */