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      1 /* libunwind - a platform-independent unwind library
      2    Copyright (C) 2006-2007 IBM
      3    Contributed by
      4      Corey Ashford <cjashfor (at) us.ibm.com>
      5      Jose Flavio Aguilar Paulino <jflavio (at) br.ibm.com> <joseflavio (at) gmail.com>
      6 
      7    Copied from libunwind-x86_64.h, modified slightly for building
      8    frysk successfully on ppc64, by Wu Zhou <woodzltc (at) cn.ibm.com>
      9    Will be replaced when libunwind is ready on ppc64 platform.
     10 
     11 This file is part of libunwind.
     12 
     13 Permission is hereby granted, free of charge, to any person obtaining
     14 a copy of this software and associated documentation files (the
     15 "Software"), to deal in the Software without restriction, including
     16 without limitation the rights to use, copy, modify, merge, publish,
     17 distribute, sublicense, and/or sell copies of the Software, and to
     18 permit persons to whom the Software is furnished to do so, subject to
     19 the following conditions:
     20 
     21 The above copyright notice and this permission notice shall be
     22 included in all copies or substantial portions of the Software.
     23 
     24 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     25 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     26 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     27 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     28 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     29 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     30 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
     31 
     32 #ifndef PPC64_LIBUNWIND_I_H
     33 #define PPC64_LIBUNWIND_I_H
     34 
     35 /* Target-dependent definitions that are internal to libunwind but need
     36    to be shared with target-independent code.  */
     37 
     38 #include <stdlib.h>
     39 #include <libunwind.h>
     40 
     41 #include "elf64.h"
     42 /* ANDROID support update. */
     43 #include "map_info.h"
     44 /* End of ANDROID update. */
     45 #include "mempool.h"
     46 #include "dwarf.h"
     47 
     48 typedef struct
     49   {
     50     /* no ppc64-specific fast trace */
     51   }
     52 unw_tdep_frame_t;
     53 
     54 struct unw_addr_space
     55 {
     56   struct unw_accessors acc;
     57   unw_caching_policy_t caching_policy;
     58 #ifdef HAVE_ATOMIC_OPS_H
     59   AO_t cache_generation;
     60 #else
     61   uint32_t cache_generation;
     62 #endif
     63   unw_word_t dyn_generation;	/* see dyn-common.h */
     64   unw_word_t dyn_info_list_addr;	/* (cached) dyn_info_list_addr */
     65   struct dwarf_rs_cache global_cache;
     66   struct unw_debug_frame_list *debug_frames;
     67   int validate;
     68   /* ANDROID support update. */
     69   struct map_info *map_list;
     70   /* End of ANDROID update. */
     71 };
     72 
     73 struct cursor
     74 {
     75   struct dwarf_cursor dwarf;	/* must be first */
     76 
     77   /* Format of sigcontext structure and address at which it is
     78      stored: */
     79   enum
     80   {
     81     PPC_SCF_NONE,		/* no signal frame encountered */
     82     PPC_SCF_LINUX_RT_SIGFRAME	/* POSIX ucontext_t */
     83   }
     84   sigcontext_format;
     85   unw_word_t sigcontext_addr;
     86 };
     87 
     88 #define DWARF_GET_LOC(l)	((l).val)
     89 
     90 #ifdef UNW_LOCAL_ONLY
     91 # define DWARF_NULL_LOC		DWARF_LOC (0, 0)
     92 # define DWARF_IS_NULL_LOC(l)	(DWARF_GET_LOC (l) == 0)
     93 # define DWARF_LOC(r, t)	((dwarf_loc_t) { .val = (r) })
     94 # define DWARF_IS_REG_LOC(l)	0
     95 # define DWARF_IS_FP_LOC(l)	0
     96 # define DWARF_IS_V_LOC(l)	0
     97 # define DWARF_MEM_LOC(c,m)	DWARF_LOC ((m), 0)
     98 # define DWARF_REG_LOC(c,r)	(DWARF_LOC((unw_word_t)			     \
     99 				 tdep_uc_addr((c)->as_arg, (r)), 0))
    100 # define DWARF_FPREG_LOC(c,r)	(DWARF_LOC((unw_word_t)			     \
    101 				 tdep_uc_addr((c)->as_arg, (r)), 0))
    102 # define DWARF_VREG_LOC(c,r)	(DWARF_LOC((unw_word_t)			     \
    103 				 tdep_uc_addr((c)->as_arg, (r)), 0))
    104 #else /* !UNW_LOCAL_ONLY */
    105 
    106 # define DWARF_LOC_TYPE_FP	(1 << 0)
    107 # define DWARF_LOC_TYPE_REG	(1 << 1)
    108 # define DWARF_LOC_TYPE_V	(1 << 2)
    109 # define DWARF_NULL_LOC		DWARF_LOC (0, 0)
    110 # define DWARF_IS_NULL_LOC(l)						\
    111 		({ dwarf_loc_t _l = (l); _l.val == 0 && _l.type == 0; })
    112 # define DWARF_LOC(r, t)	((dwarf_loc_t) { .val = (r), .type = (t) })
    113 # define DWARF_IS_REG_LOC(l)	(((l).type & DWARF_LOC_TYPE_REG) != 0)
    114 # define DWARF_IS_FP_LOC(l)	(((l).type & DWARF_LOC_TYPE_FP) != 0)
    115 # define DWARF_IS_V_LOC(l)	(((l).type & DWARF_LOC_TYPE_V) != 0)
    116 # define DWARF_MEM_LOC(c,m)	DWARF_LOC ((m), 0)
    117 # define DWARF_REG_LOC(c,r)	DWARF_LOC((r), DWARF_LOC_TYPE_REG)
    118 # define DWARF_FPREG_LOC(c,r)	DWARF_LOC((r), (DWARF_LOC_TYPE_REG	\
    119 						| DWARF_LOC_TYPE_FP))
    120 # define DWARF_VREG_LOC(c,r)	DWARF_LOC((r), (DWARF_LOC_TYPE_REG	\
    121 						| DWARF_LOC_TYPE_V))
    122 
    123 #endif /* !UNW_LOCAL_ONLY */
    124 
    125 static inline int
    126 dwarf_getvr (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t * val)
    127 {
    128   unw_word_t *valp = (unw_word_t *) val;
    129   unw_word_t addr;
    130   int ret;
    131 
    132   if (DWARF_IS_NULL_LOC (loc))
    133     return -UNW_EBADREG;
    134 
    135   assert (DWARF_IS_V_LOC (loc));
    136   assert (!DWARF_IS_FP_LOC (loc));
    137 
    138   if (DWARF_IS_REG_LOC (loc))
    139     return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
    140 				      val, 0, c->as_arg);
    141 
    142   addr = DWARF_GET_LOC (loc);
    143 
    144   if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, valp,
    145 				       0, c->as_arg)) < 0)
    146     return ret;
    147 
    148   return (*c->as->acc.access_mem) (c->as, addr + 8, valp + 1, 0, c->as_arg);
    149 }
    150 
    151 static inline int
    152 dwarf_putvr (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
    153 {
    154   unw_word_t *valp = (unw_word_t *) & val;
    155   unw_word_t addr;
    156   int ret;
    157 
    158   if (DWARF_IS_NULL_LOC (loc))
    159     return -UNW_EBADREG;
    160 
    161   assert (DWARF_IS_V_LOC (loc));
    162   assert (!DWARF_IS_FP_LOC (loc));
    163 
    164   if (DWARF_IS_REG_LOC (loc))
    165     return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
    166 				      &val, 1, c->as_arg);
    167 
    168   addr = DWARF_GET_LOC (loc);
    169   if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, valp,
    170 				       1, c->as_arg)) < 0)
    171     return ret;
    172 
    173   return (*c->as->acc.access_mem) (c->as, addr + 8, valp + 1, 1, c->as_arg);
    174 }
    175 
    176 static inline int
    177 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t * val)
    178 {
    179   unw_word_t *valp = (unw_word_t *) val;
    180   unw_word_t addr;
    181 
    182   if (DWARF_IS_NULL_LOC (loc))
    183     return -UNW_EBADREG;
    184 
    185   assert (DWARF_IS_FP_LOC (loc));
    186   assert (!DWARF_IS_V_LOC (loc));
    187 
    188   if (DWARF_IS_REG_LOC (loc))
    189     return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
    190 				       val, 0, c->as_arg);
    191 
    192   addr = DWARF_GET_LOC (loc);
    193   return (*c->as->acc.access_mem) (c->as, addr + 0, valp, 0, c->as_arg);
    194 
    195 }
    196 
    197 static inline int
    198 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
    199 {
    200   unw_word_t *valp = (unw_word_t *) & val;
    201   unw_word_t addr;
    202 
    203   if (DWARF_IS_NULL_LOC (loc))
    204     return -UNW_EBADREG;
    205 
    206   assert (DWARF_IS_FP_LOC (loc));
    207   assert (!DWARF_IS_V_LOC (loc));
    208 
    209   if (DWARF_IS_REG_LOC (loc))
    210     return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
    211 				       &val, 1, c->as_arg);
    212 
    213   addr = DWARF_GET_LOC (loc);
    214 
    215   return (*c->as->acc.access_mem) (c->as, addr + 0, valp, 1, c->as_arg);
    216 }
    217 
    218 static inline int
    219 dwarf_get (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   assert (!DWARF_IS_V_LOC (loc));
    230 
    231   if (DWARF_IS_REG_LOC (loc))
    232     return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), val,
    233 				     0, c->as_arg);
    234   else
    235     return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
    236 				     0, c->as_arg);
    237 }
    238 
    239 static inline int
    240 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
    241 {
    242   if (DWARF_IS_NULL_LOC (loc))
    243     return -UNW_EBADREG;
    244 
    245   /* If a code-generator were to save a value of type unw_word_t in a
    246      floating-point register, we would have to support this case.  I
    247      suppose it could happen with MMX registers, but does it really
    248      happen?  */
    249   assert (!DWARF_IS_FP_LOC (loc));
    250   assert (!DWARF_IS_V_LOC (loc));
    251 
    252   if (DWARF_IS_REG_LOC (loc))
    253     return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), &val,
    254 				     1, c->as_arg);
    255   else
    256     return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val,
    257 				     1, c->as_arg);
    258 }
    259 
    260 #define tdep_getcontext_trace           unw_getcontext
    261 #define tdep_init_done			UNW_OBJ(init_done)
    262 #define tdep_init			UNW_OBJ(init)
    263 /* Platforms that support UNW_INFO_FORMAT_TABLE need to define
    264    tdep_search_unwind_table.  */
    265 #define tdep_search_unwind_table	dwarf_search_unwind_table
    266 #define tdep_find_unwind_table		dwarf_find_unwind_table
    267 #define tdep_uc_addr			UNW_ARCH_OBJ(uc_addr)
    268 #define tdep_get_elf_image		UNW_ARCH_OBJ(get_elf_image)
    269 #define tdep_access_reg			UNW_OBJ(access_reg)
    270 #define tdep_access_fpreg		UNW_OBJ(access_fpreg)
    271 #define tdep_fetch_frame(c,ip,n)	do {} while(0)
    272 #define tdep_cache_frame(c,rs)		do {} while(0)
    273 #define tdep_reuse_frame(c,rs)		do {} while(0)
    274 #define tdep_stash_frame(c,rs)		do {} while(0)
    275 #define tdep_trace(cur,addr,n)		(-UNW_ENOINFO)
    276 #define tdep_get_func_addr		UNW_OBJ(get_func_addr)
    277 
    278 #ifdef UNW_LOCAL_ONLY
    279 # define tdep_find_proc_info(c,ip,n)				\
    280 	dwarf_find_proc_info((c)->as, (ip), &(c)->pi, (n),	\
    281 				       (c)->as_arg)
    282 # define tdep_put_unwind_info(as,pi,arg)		\
    283 	dwarf_put_unwind_info((as), (pi), (arg))
    284 #else
    285 # define tdep_find_proc_info(c,ip,n)					\
    286 	(*(c)->as->acc.find_proc_info)((c)->as, (ip), &(c)->pi, (n),	\
    287 				       (c)->as_arg)
    288 # define tdep_put_unwind_info(as,pi,arg)			\
    289 	(*(as)->acc.put_unwind_info)((as), (pi), (arg))
    290 #endif
    291 
    292 extern int tdep_fetch_proc_info_post (struct dwarf_cursor *c, unw_word_t ip,
    293 				      int need_unwind_info);
    294 
    295 #define tdep_get_as(c)			((c)->dwarf.as)
    296 #define tdep_get_as_arg(c)		((c)->dwarf.as_arg)
    297 #define tdep_get_ip(c)			((c)->dwarf.ip)
    298 #define tdep_big_endian(as)		1
    299 
    300 extern int tdep_init_done;
    301 
    302 extern void tdep_init (void);
    303 extern int tdep_search_unwind_table (unw_addr_space_t as, unw_word_t ip,
    304 				     unw_dyn_info_t * di,
    305 				     unw_proc_info_t * pi,
    306 				     int need_unwind_info, void *arg);
    307 extern void *tdep_uc_addr (ucontext_t * uc, int reg);
    308 /* ANDROID support update. */
    309 extern int tdep_get_elf_image (unw_addr_space_t as, struct elf_image *ei,
    310 			       pid_t pid, unw_word_t ip,
    311 			       unsigned long *segbase, unsigned long *mapoff,
    312 			       char **path);
    313 /* End of ANDROID update. */
    314 extern int tdep_access_reg (struct cursor *c, unw_regnum_t reg,
    315 			    unw_word_t * valp, int write);
    316 extern int tdep_access_fpreg (struct cursor *c, unw_regnum_t reg,
    317 			      unw_fpreg_t * valp, int write);
    318 extern int tdep_get_func_addr (unw_addr_space_t as, unw_word_t addr,
    319 			       unw_word_t *entry_point);
    320 
    321 #endif /* PPC64_LIBUNWIND_I_H */
    322