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      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 #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 /* ANDROID support update. */
     36 #include "map_info.h"
     37 /* End of ANDROID update. */
     38 #include "mempool.h"
     39 #include "dwarf.h"
     40 #include "ex_tables.h"
     41 
     42 typedef struct
     43   {
     44     /* no arm-specific fast trace */
     45   }
     46 unw_tdep_frame_t;
     47 
     48 struct unw_addr_space
     49   {
     50     struct unw_accessors acc;
     51     int big_endian;
     52     unw_caching_policy_t caching_policy;
     53 #ifdef HAVE_ATOMIC_OPS_H
     54     AO_t cache_generation;
     55 #else
     56     uint32_t cache_generation;
     57 #endif
     58     unw_word_t dyn_generation;		/* see dyn-common.h */
     59     unw_word_t dyn_info_list_addr;	/* (cached) dyn_info_list_addr */
     60     struct dwarf_rs_cache global_cache;
     61     struct unw_debug_frame_list *debug_frames;
     62     /* ANDROID support update. */
     63     struct map_info *map_list;
     64     /* End of ANDROID update. */
     65   };
     66 
     67 struct cursor
     68   {
     69     struct dwarf_cursor dwarf;		/* must be first */
     70     enum
     71       {
     72         ARM_SCF_NONE,                   /* no signal frame */
     73         ARM_SCF_LINUX_SIGFRAME,         /* non-RT signal frame, kernel >=2.6.18 */
     74         ARM_SCF_LINUX_RT_SIGFRAME,      /* RT signal frame, kernel >=2.6.18 */
     75         ARM_SCF_LINUX_OLD_SIGFRAME,     /* non-RT signal frame, kernel < 2.6.18 */
     76         ARM_SCF_LINUX_OLD_RT_SIGFRAME   /* RT signal frame, kernel < 2.6.18 */
     77       }
     78     sigcontext_format;
     79     unw_word_t sigcontext_addr;
     80     unw_word_t sigcontext_sp;
     81     unw_word_t sigcontext_pc;
     82   };
     83 
     84 #define DWARF_GET_LOC(l)	((l).val)
     85 
     86 #ifdef UNW_LOCAL_ONLY
     87 # define DWARF_NULL_LOC		DWARF_LOC (0, 0)
     88 # define DWARF_IS_NULL_LOC(l)	(DWARF_GET_LOC (l) == 0)
     89 # define DWARF_LOC(r, t)	((dwarf_loc_t) { .val = (r) })
     90 # define DWARF_IS_REG_LOC(l)	0
     91 # define DWARF_REG_LOC(c,r)	(DWARF_LOC((unw_word_t)			     \
     92 				 tdep_uc_addr((c)->as_arg, (r)), 0))
     93 # define DWARF_MEM_LOC(c,m)	DWARF_LOC ((m), 0)
     94 # define DWARF_FPREG_LOC(c,r)	(DWARF_LOC((unw_word_t)			     \
     95 				 tdep_uc_addr((c)->as_arg, (r)), 0))
     96 
     97 static inline int
     98 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val)
     99 {
    100 /* ANDROID support update. */
    101   unw_fpreg_t *addr = (unw_fpreg_t *) (uintptr_t) DWARF_GET_LOC (loc);
    102   if (!addr || !map_local_is_readable ((unw_word_t) (uintptr_t) addr))
    103     return -1;
    104 
    105   *val = *addr;
    106   return 0;
    107 /* End of ANDROID update. */
    108 }
    109 
    110 static inline int
    111 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
    112 {
    113 /* ANDROID support update. */
    114   unw_fpreg_t *addr = (unw_fpreg_t *) (uintptr_t) DWARF_GET_LOC (loc);
    115   if (!addr || !map_local_is_writable ((unw_word_t) (uintptr_t) addr))
    116     return -1;
    117 
    118   *addr = val;
    119   return 0;
    120 /* End of ANDROID update. */
    121 }
    122 
    123 static inline int
    124 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val)
    125 {
    126 /* ANDROID support update. */
    127   if (!DWARF_GET_LOC (loc))
    128     return -1;
    129   return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
    130 				   0, c->as_arg);
    131 /* End of ANDROID update. */
    132 }
    133 
    134 static inline int
    135 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
    136 {
    137 /* ANDROID support update. */
    138   if (!DWARF_GET_LOC (loc))
    139     return -1;
    140   return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val,
    141 				   1, c->as_arg);
    142 /* End of ANDROID update. */
    143 }
    144 
    145 #else /* !UNW_LOCAL_ONLY */
    146 # define DWARF_LOC_TYPE_FP	(1 << 0)
    147 # define DWARF_LOC_TYPE_REG	(1 << 1)
    148 # define DWARF_NULL_LOC		DWARF_LOC (0, 0)
    149 # define DWARF_IS_NULL_LOC(l)						\
    150 		({ dwarf_loc_t _l = (l); _l.val == 0 && _l.type == 0; })
    151 # define DWARF_LOC(r, t)	((dwarf_loc_t) { .val = (r), .type = (t) })
    152 # define DWARF_IS_REG_LOC(l)	(((l).type & DWARF_LOC_TYPE_REG) != 0)
    153 # define DWARF_IS_FP_LOC(l)	(((l).type & DWARF_LOC_TYPE_FP) != 0)
    154 # define DWARF_REG_LOC(c,r)	DWARF_LOC((r), DWARF_LOC_TYPE_REG)
    155 # define DWARF_MEM_LOC(c,m)	DWARF_LOC ((m), 0)
    156 # define DWARF_FPREG_LOC(c,r)	DWARF_LOC((r), (DWARF_LOC_TYPE_REG	\
    157 						| DWARF_LOC_TYPE_FP))
    158 
    159 static inline int
    160 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val)
    161 {
    162   char *valp = (char *) &val;
    163   unw_word_t addr;
    164   int ret;
    165 
    166   if (DWARF_IS_NULL_LOC (loc))
    167     return -UNW_EBADREG;
    168 
    169   if (DWARF_IS_REG_LOC (loc))
    170     return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
    171 				       val, 0, c->as_arg);
    172 
    173   addr = DWARF_GET_LOC (loc);
    174   if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp,
    175 				       0, c->as_arg)) < 0)
    176     return ret;
    177 
    178   return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1, 0,
    179 				   c->as_arg);
    180 }
    181 
    182 static inline int
    183 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
    184 {
    185   char *valp = (char *) &val;
    186   unw_word_t addr;
    187   int ret;
    188 
    189   if (DWARF_IS_NULL_LOC (loc))
    190     return -UNW_EBADREG;
    191 
    192   if (DWARF_IS_REG_LOC (loc))
    193     return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
    194 				       &val, 1, c->as_arg);
    195 
    196   addr = DWARF_GET_LOC (loc);
    197   if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp,
    198 				       1, c->as_arg)) < 0)
    199     return ret;
    200 
    201   return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1,
    202 				   1, c->as_arg);
    203 }
    204 
    205 static inline int
    206 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val)
    207 {
    208   if (DWARF_IS_NULL_LOC (loc))
    209     return -UNW_EBADREG;
    210 
    211   /* If a code-generator were to save a value of type unw_word_t in a
    212      floating-point register, we would have to support this case.  I
    213      suppose it could happen with MMX registers, but does it really
    214      happen?  */
    215   assert (!DWARF_IS_FP_LOC (loc));
    216 
    217   if (DWARF_IS_REG_LOC (loc))
    218     return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), val,
    219 				     0, c->as_arg);
    220   else
    221     return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
    222 				     0, c->as_arg);
    223 }
    224 
    225 static inline int
    226 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
    227 {
    228   if (DWARF_IS_NULL_LOC (loc))
    229     return -UNW_EBADREG;
    230 
    231   /* If a code-generator were to save a value of type unw_word_t in a
    232      floating-point register, we would have to support this case.  I
    233      suppose it could happen with MMX registers, but does it really
    234      happen?  */
    235   assert (!DWARF_IS_FP_LOC (loc));
    236 
    237   if (DWARF_IS_REG_LOC (loc))
    238     return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), &val,
    239 				     1, c->as_arg);
    240   else
    241     return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val,
    242 				     1, c->as_arg);
    243 }
    244 
    245 #endif /* !UNW_LOCAL_ONLY */
    246 
    247 #define tdep_getcontext_trace           unw_getcontext
    248 #define tdep_init_done			UNW_OBJ(init_done)
    249 #define tdep_init			UNW_OBJ(init)
    250 #define arm_find_proc_info		UNW_OBJ(find_proc_info)
    251 #define arm_put_unwind_info		UNW_OBJ(put_unwind_info)
    252 /* Platforms that support UNW_INFO_FORMAT_TABLE need to define
    253    tdep_search_unwind_table.  */
    254 #define tdep_search_unwind_table	UNW_OBJ(search_unwind_table)
    255 #define tdep_find_unwind_table		dwarf_find_unwind_table
    256 #define tdep_uc_addr			UNW_ARCH_OBJ(uc_addr)
    257 #define tdep_get_elf_image		UNW_ARCH_OBJ(get_elf_image)
    258 #define tdep_access_reg			UNW_OBJ(access_reg)
    259 #define tdep_access_fpreg		UNW_OBJ(access_fpreg)
    260 #define tdep_fetch_frame(c,ip,n)	do {} while(0)
    261 #define tdep_cache_frame(c,rs)		do {} while(0)
    262 #define tdep_reuse_frame(c,rs)		do {} while(0)
    263 #define tdep_stash_frame(c,rs)		do {} while(0)
    264 #define tdep_trace(cur,addr,n)		(-UNW_ENOINFO)
    265 
    266 #ifdef UNW_LOCAL_ONLY
    267 # define tdep_find_proc_info(c,ip,n)				\
    268 	arm_find_proc_info((c)->as, (ip), &(c)->pi, (n),	\
    269 				       (c)->as_arg)
    270 # define tdep_put_unwind_info(as,pi,arg)		\
    271 	arm_put_unwind_info((as), (pi), (arg))
    272 #else
    273 # define tdep_find_proc_info(c,ip,n)					\
    274 	(*(c)->as->acc.find_proc_info)((c)->as, (ip), &(c)->pi, (n),	\
    275 				       (c)->as_arg)
    276 # define tdep_put_unwind_info(as,pi,arg)		\
    277 	(*(as)->acc.put_unwind_info)((as), (pi), (arg))
    278 #endif
    279 
    280 #define tdep_get_as(c)			((c)->dwarf.as)
    281 #define tdep_get_as_arg(c)		((c)->dwarf.as_arg)
    282 #define tdep_get_ip(c)			((c)->dwarf.ip)
    283 #define tdep_big_endian(as)		((as)->big_endian)
    284 
    285 extern int tdep_init_done;
    286 
    287 extern void tdep_init (void);
    288 extern int arm_find_proc_info (unw_addr_space_t as, unw_word_t ip,
    289 			       unw_proc_info_t *pi, int need_unwind_info,
    290 			       void *arg);
    291 extern void arm_put_unwind_info (unw_addr_space_t as,
    292 				  unw_proc_info_t *pi, void *arg);
    293 extern int tdep_search_unwind_table (unw_addr_space_t as, unw_word_t ip,
    294 				     unw_dyn_info_t *di, unw_proc_info_t *pi,
    295 				     int need_unwind_info, void *arg);
    296 extern void *tdep_uc_addr (unw_tdep_context_t *uc, int reg);
    297 /* ANDROID support update. */
    298 extern int tdep_get_elf_image (unw_addr_space_t as, struct elf_image *ei,
    299 			       pid_t pid, unw_word_t ip,
    300 			       unsigned long *segbase, unsigned long *mapoff,
    301 			       char **path);
    302 /* End of ANDROID update. */
    303 extern int tdep_access_reg (struct cursor *c, unw_regnum_t reg,
    304 			    unw_word_t *valp, int write);
    305 extern int tdep_access_fpreg (struct cursor *c, unw_regnum_t reg,
    306 			      unw_fpreg_t *valp, int write);
    307 
    308 /* unwinding method selection support */
    309 #define UNW_ARM_METHOD_ALL          0xFF
    310 #define UNW_ARM_METHOD_DWARF        0x01
    311 #define UNW_ARM_METHOD_FRAME        0x02
    312 #define UNW_ARM_METHOD_EXIDX        0x04
    313 /* ANDROID support update. */
    314 #define UNW_ARM_METHOD_LR           0x08
    315 /* End of ANDROID update. */
    316 
    317 #define unwi_unwind_method   UNW_OBJ(unwind_method)
    318 extern int unwi_unwind_method;
    319 
    320 #define UNW_TRY_METHOD(x)   (unwi_unwind_method & x)
    321 
    322 #endif /* ARM_LIBUNWIND_I_H */
    323