libexec/rtld-elf/debug.c

   1 /*-
   2  * Copyright 1996-1998 John D. Polstra.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  *
  25  * $FreeBSD$
  26  */
  27
  28 /*
  29  * Support for printing debugging messages.
  30  */
  31
  32 #include <stdarg.h>
  33 #include <stdio.h>
  34
  35 #include "debug.h"
  36 #include "rtld.h"
  37
  38 static const char rel_header[] =
  39     " symbol name               r_info r_offset st_value st_size    address    value\n"
  40     " ------------------------------------------------------------------------------\n";
  41 static const char rel_format[] =  " %-25s %6lx %08lx %08lx %7d %10p %08lx\n";
  42
  43 int debug = 0;
  44
  45 void
  46 debug_printf(const char *format, ...)
  47 {
  48     if (debug) {
  49         va_list ap;
  50         va_start(ap, format);
  51
  52         fflush(stdout);
  53         vfprintf(stderr, format, ap);
  54         putc('\n', stderr);
  55
  56         va_end(ap);
  57     }
  58 }
  59
  60 void
  61 dump_relocations (Obj_Entry *obj0)
  62 {
  63     Obj_Entry *obj;
  64
  65     for (obj = obj0; obj != NULL; obj = obj->next) {
  66         dump_obj_relocations(obj);
  67     }
  68 }
  69
  70 void
  71 dump_obj_relocations (Obj_Entry *obj)
  72 {
  73
  74     printf("Object \"%s\", relocbase %p\n", obj->path, obj->relocbase);
  75
  76     if (obj->relsize) {
  77         printf("Non-PLT Relocations: %ld\n",
  78             (obj->relsize / sizeof(Elf_Rel)));
  79         dump_Elf_Rel(obj, obj->rel, obj->relsize);
  80     }
  81
  82     if (obj->relasize) {
  83         printf("Non-PLT Relocations with Addend: %ld\n",
  84             (obj->relasize / sizeof(Elf_Rela)));
  85         dump_Elf_Rela(obj, obj->rela, obj->relasize);
  86     }
  87
  88     if (obj->pltrelsize) {
  89         printf("PLT Relocations: %ld\n",
  90             (obj->pltrelsize / sizeof(Elf_Rel)));
  91         dump_Elf_Rel(obj, obj->pltrel, obj->pltrelsize);
  92     }
  93
  94     if (obj->pltrelasize) {
  95         printf("PLT Relocations with Addend: %ld\n",
  96             (obj->pltrelasize / sizeof(Elf_Rela)));
  97         dump_Elf_Rela(obj, obj->pltrela, obj->pltrelasize);
  98     }
  99 }
 100
 101 void
 102 dump_Elf_Rel (Obj_Entry *obj, const Elf_Rel *rel0, u_long relsize)
 103 {
 104     const Elf_Rel *rel;
 105     const Elf_Rel *rellim;
 106     const Elf_Sym *sym;
 107     Elf_Addr *dstaddr;
 108
 109     printf("%s", rel_header);
 110     rellim = (const Elf_Rel *)((const char *)rel0 + relsize);
 111     for (rel = rel0; rel < rellim; rel++) {
 112         dstaddr = (Elf_Addr *)(obj->relocbase + rel->r_offset);
 113         sym = obj->symtab + ELF_R_SYM(rel->r_info);
 114         printf(rel_format,
 115                 obj->strtab + sym->st_name,
 116                 (u_long)rel->r_info, (u_long)rel->r_offset,
 117                 (u_long)sym->st_value, (int)sym->st_size,
 118                 dstaddr, (u_long)*dstaddr);
 119     }
 120     return;
 121 }
 122
 123 void
 124 dump_Elf_Rela (Obj_Entry *obj, const Elf_Rela *rela0, u_long relasize)
 125 {
 126     const Elf_Rela *rela;
 127     const Elf_Rela *relalim;
 128     const Elf_Sym *sym;
 129     Elf_Addr *dstaddr;
 130
 131     printf("%s", rel_header);
 132     relalim = (const Elf_Rela *)((const char *)rela0 + relasize);
 133     for (rela = rela0; rela < relalim; rela++) {
 134         dstaddr = (Elf_Addr *)(obj->relocbase + rela->r_offset);
 135         sym = obj->symtab + ELF_R_SYM(rela->r_info);
 136         printf(rel_format,
 137                 obj->strtab + sym->st_name,
 138                 (u_long)rela->r_info, (u_long)rela->r_offset,
 139                 (u_long)sym->st_value, (int)sym->st_size,
 140                 dstaddr, (u_long)*dstaddr);
 141     }
 142     return;
 143 }