objcommon.c

   1 /*  Copyright (C) 2008  Jeffrey Brian Arnold <jbarnold@mit.edu>
   2  *
   3  *  This program is free software; you can redistribute it and/or modify
   4  *  it under the terms of the GNU General Public License, version 2.
   5  *
   6  *  This program is distributed in the hope that it will be useful,
   7  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  *  GNU General Public License for more details.
  10  *
  11  *  You should have received a copy of the GNU General Public License
  12  *  along with this program; if not, write to the Free Software
  13  *  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  14  *  02110-1301, USA.
  15  */
  16
  17 #include "objcommon.h"
  18
  19 long get_syms(bfd *abfd, asymbol ***syms_ptr)
  20 {
  21         long storage_needed = bfd_get_symtab_upper_bound(abfd);
  22         if (storage_needed == 0)
  23                 return 0;
  24         assert(storage_needed >= 0);
  25
  26         *syms_ptr = (asymbol **)malloc(storage_needed);
  27         long num_syms = bfd_canonicalize_symtab(abfd, *syms_ptr);
  28         assert(num_syms >= 0);
  29
  30         return num_syms;
  31 }
  32
  33 struct supersect *fetch_supersect(bfd *abfd, asection *sect, asymbol **sympp)
  34 {
  35         static struct supersect *supersects = NULL;
  36
  37         struct supersect *ss;
  38         for (ss = supersects; ss != NULL; ss = ss->next) {
  39                 if (strcmp(sect->name, ss->name) == 0 && ss->parent == abfd) {
  40                         return ss;
  41                 }
  42         }
  43
  44         struct supersect *new = malloc(sizeof(*new));
  45         new->parent = abfd;
  46         new->name = malloc(strlen(sect->name) + 1);
  47         strcpy(new->name, sect->name);
  48         new->next = supersects;
  49         supersects = new;
  50
  51         new->contents_size = bfd_get_section_size(sect);
  52         new->contents = (void *)malloc(align(new->contents_size, 4));
  53         assert(bfd_get_section_contents
  54                (abfd, sect, new->contents, 0, new->contents_size));
  55
  56         int relsize = bfd_get_reloc_upper_bound(abfd, sect);
  57         new->relocs = (void *)malloc(relsize);
  58         new->num_relocs =
  59             bfd_canonicalize_reloc(abfd, sect, new->relocs, sympp);
  60         assert(new->num_relocs >= 0);
  61
  62         return new;
  63 }
  64
  65 int label_offset(const char *sym_name)
  66 {
  67         int i;
  68         for (i = 0;
  69              sym_name[i] != 0 && sym_name[i + 1] != 0 && sym_name[i + 2] != 0
  70              && sym_name[i + 3] != 0; i++) {
  71                 if (sym_name[i] == '_' && sym_name[i + 1] == '_'
  72                     && sym_name[i + 2] == '_' && sym_name[i + 3] == '_') {
  73                         return i + 4;
  74                 }
  75         }
  76         return -1;
  77 }
  78
  79 const char *only_label(const char *sym_name)
  80 {
  81         int offset = label_offset(sym_name);
  82         if (offset == -1)
  83                 return NULL;
  84         return &sym_name[offset];
  85 }
  86
  87 const char *dup_wolabel(const char *sym_name)
  88 {
  89         int offset, entire_strlen, label_strlen, new_strlen;
  90         char *newstr;
  91
  92         offset = label_offset(sym_name);
  93         if (offset == -1) {
  94                 label_strlen = 0;
  95         } else {
  96                 label_strlen = strlen(&sym_name[offset]) + strlen("____");
  97         }
  98
  99         entire_strlen = strlen(sym_name);
 100         new_strlen = entire_strlen - label_strlen;
 101         newstr = malloc(new_strlen + 1);
 102         memcpy(newstr, sym_name, new_strlen);
 103         newstr[new_strlen] = 0;
 104         return newstr;
 105 }