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      1 /* libunwind - a platform-independent unwind library
      2    Copyright (C) 2003-2005 Hewlett-Packard Co
      3 	Contributed by David Mosberger-Tang <davidm (at) 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 #include "_UCD_lib.h"
     27 #include "_UCD_internal.h"
     28 
     29 #if UNW_TARGET_IA64 && defined(__linux)
     30 # include "elf64.h"
     31 # include "os-linux.h"
     32 
     33 static inline int
     34 get_list_addr (unw_addr_space_t as, unw_word_t *dil_addr, void *arg,
     35 	       int *countp)
     36 {
     37   unsigned long lo, hi, off;
     38   struct UPT_info *ui = arg;
     39   struct map_iterator mi;
     40   char path[PATH_MAX];
     41   unw_dyn_info_t *di;
     42   unw_word_t res;
     43   int count = 0;
     44 
     45   maps_init (&mi, ui->pid);
     46   while (maps_next (&mi, &lo, &hi, &off))
     47     {
     48       if (off)
     49 	continue;
     50 
     51       invalidate_edi (&ui->edi);
     52 
     53       if (elf_map_image (&ui->ei, path) < 0)
     54 	/* ignore unmappable stuff like "/SYSV00001b58 (deleted)" */
     55 	continue;
     56 
     57       Debug (16, "checking object %s\n", path);
     58 
     59       di = tdep_find_unwind_table (&ui->edi, as, path, lo, off);
     60       if (di)
     61 	{
     62 	  res = _Uia64_find_dyn_list (as, di, arg);
     63 	  if (res && count++ == 0)
     64 	    {
     65 	      Debug (12, "dyn_info_list_addr = 0x%lx\n", (long) res);
     66 	      *dil_addr = res;
     67 	    }
     68 	}
     69     }
     70   maps_close (&mi);
     71   *countp = count;
     72   return 0;
     73 }
     74 
     75 #else
     76 
     77 static inline int
     78 get_list_addr (unw_addr_space_t as, unw_word_t *dil_addr, void *arg,
     79 	       int *countp)
     80 {
     81 # warning Implement get_list_addr(), please.
     82   *countp = 0;
     83   return 0;
     84 }
     85 
     86 #endif
     87 
     88 int
     89 _UCD_get_dyn_info_list_addr (unw_addr_space_t as, unw_word_t *dil_addr,
     90 			     void *arg)
     91 {
     92   int count, ret;
     93 
     94   Debug (12, "looking for dyn_info list\n");
     95 
     96   if ((ret = get_list_addr (as, dil_addr, arg, &count)) < 0)
     97     return ret;
     98 
     99   /* If multiple dynamic-info list addresses are found, we would have
    100      to determine which was is the one actually in use (since the
    101      dynamic name resolution algorithm will pick one "winner").
    102      Perhaps we'd have to track them all until we find one that's
    103      non-empty.  Hopefully, this case simply will never arise, since
    104      only libunwind defines the dynamic info list head. */
    105   assert (count <= 1);
    106 
    107   return (count > 0) ? 0 : -UNW_ENOINFO;
    108 }
    109