src/libs/libunwind/ptrace/_UPT_find_proc_info.c

   1 /* libunwind - a platform-independent unwind library
   2    Copyright (C) 2003-2004 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 #include <elf.h>
  27 #include <fcntl.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30
  31 #include <sys/mman.h>
  32
  33 #include "_UPT_internal.h"
  34
  35 static int
  36 get_unwind_info (struct elf_dyn_info *edi, pid_t pid, unw_addr_space_t as, unw_word_t ip)
  37 {
  38   unsigned long segbase, mapoff;
  39   char path[PATH_MAX];
  40
  41 #if UNW_TARGET_IA64 && defined(__linux)
  42   if (!edi->ktab.start_ip && _Uia64_get_kernel_table (&edi->ktab) < 0)
  43     return -UNW_ENOINFO;
  44
  45   if (edi->ktab.format != -1 && ip >= edi->ktab.start_ip && ip < edi->ktab.end_ip)
  46     return 0;
  47 #endif
  48
  49   if ((edi->di_cache.format != -1
  50        && ip >= edi->di_cache.start_ip && ip < edi->di_cache.end_ip)
  51 #if UNW_TARGET_ARM
  52       || (edi->di_debug.format != -1
  53        && ip >= edi->di_arm.start_ip && ip < edi->di_arm.end_ip)
  54 #endif
  55       || (edi->di_debug.format != -1
  56        && ip >= edi->di_debug.start_ip && ip < edi->di_debug.end_ip))
  57     return 0;
  58
  59   invalidate_edi(edi);
  60
  61   if (tdep_get_elf_image (&edi->ei, pid, ip, &segbase, &mapoff, path,
  62                           sizeof(path)) < 0)
  63     return -UNW_ENOINFO;
  64
  65   /* Here, SEGBASE is the starting-address of the (mmap'ped) segment
  66      which covers the IP we're looking for.  */
  67   if (tdep_find_unwind_table (edi, as, path, segbase, mapoff, ip) < 0)
  68     return -UNW_ENOINFO;
  69
  70   /* This can happen in corner cases where dynamically generated
  71      code falls into the same page that contains the data-segment
  72      and the page-offset of the code is within the first page of
  73      the executable.  */
  74   if (edi->di_cache.format != -1
  75       && (ip < edi->di_cache.start_ip || ip >= edi->di_cache.end_ip))
  76      edi->di_cache.format = -1;
  77
  78   if (edi->di_debug.format != -1
  79       && (ip < edi->di_debug.start_ip || ip >= edi->di_debug.end_ip))
  80      edi->di_debug.format = -1;
  81
  82   if (edi->di_cache.format == -1
  83 #if UNW_TARGET_ARM
  84       && edi->di_arm.format == -1
  85 #endif
  86       && edi->di_debug.format == -1)
  87     return -UNW_ENOINFO;
  88
  89   return 0;
  90 }
  91
  92 int
  93 _UPT_find_proc_info (unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi,
  94                      int need_unwind_info, void *arg)
  95 {
  96   struct UPT_info *ui = arg;
  97   int ret = -UNW_ENOINFO;
  98
  99   if (get_unwind_info (&ui->edi, ui->pid, as, ip) < 0)
 100     return -UNW_ENOINFO;
 101
 102 #if UNW_TARGET_IA64
 103   if (ui->edi.ktab.format != -1)
 104     {
 105       /* The kernel unwind table resides in local memory, so we have
 106          to use the local address space to search it.  Since
 107          _UPT_put_unwind_info() has no easy way of detecting this
 108          case, we simply make a copy of the unwind-info, so
 109          _UPT_put_unwind_info() can always free() the unwind-info
 110          without ill effects.  */
 111       ret = tdep_search_unwind_table (unw_local_addr_space, ip, &ui->edi.ktab, pi,
 112                                       need_unwind_info, arg);
 113       if (ret >= 0)
 114         {
 115           if (!need_unwind_info)
 116             pi->unwind_info = NULL;
 117           else
 118             {
 119               void *mem = malloc (pi->unwind_info_size);
 120
 121               if (!mem)
 122                 return -UNW_ENOMEM;
 123               memcpy (mem, pi->unwind_info, pi->unwind_info_size);
 124               pi->unwind_info = mem;
 125             }
 126         }
 127     }
 128 #endif
 129
 130   if (ret == -UNW_ENOINFO && ui->edi.di_cache.format != -1)
 131     ret = tdep_search_unwind_table (as, ip, &ui->edi.di_cache,
 132                                     pi, need_unwind_info, arg);
 133
 134 #if UNW_TARGET_ARM
 135   if (ret == -UNW_ENOINFO && ui->edi.di_arm.format != -1)
 136     ret = tdep_search_unwind_table (as, ip, &ui->edi.di_arm, pi,
 137                                     need_unwind_info, arg);
 138 #endif
 139
 140   if (ret == -UNW_ENOINFO && ui->edi.di_debug.format != -1)
 141     ret = tdep_search_unwind_table (as, ip, &ui->edi.di_debug, pi,
 142                                     need_unwind_info, arg);
 143
 144   return ret;
 145 }