1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright 1996-1998 John D. Polstra. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 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 #include "rtld_printf.h" 38 39 static const char rel_header[] = 40 " symbol name r_info r_offset st_value st_size address value\n" 41 " ------------------------------------------------------------------------------\n"; 42 static const char rel_format[] = " %-25s %6lx %08lx %08lx %7d %10p %08lx\n"; 43 44 int debug = 0; 45 46 void 47 debug_printf(const char *format, ...) 48 { 49 if (debug) { 50 va_list ap; 51 va_start(ap, format); 52 53 rtld_vfdprintf(STDERR_FILENO, format, ap); 54 rtld_fdputchar(STDERR_FILENO, '\n'); 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 = globallist_curr(obj0); obj != NULL; 66 obj = globallist_next(obj)) { 67 dump_obj_relocations(obj); 68 } 69 } 70 71 void 72 dump_obj_relocations (Obj_Entry *obj) 73 { 74 75 rtld_printf("Object \"%s\", relocbase %p\n", obj->path, obj->relocbase); 76 77 if (obj->relsize) { 78 rtld_printf("Non-PLT Relocations: %ld\n", 79 (obj->relsize / sizeof(Elf_Rel))); 80 dump_Elf_Rel(obj, obj->rel, obj->relsize); 81 } 82 83 if (obj->relasize) { 84 rtld_printf("Non-PLT Relocations with Addend: %ld\n", 85 (obj->relasize / sizeof(Elf_Rela))); 86 dump_Elf_Rela(obj, obj->rela, obj->relasize); 87 } 88 89 if (obj->pltrelsize) { 90 rtld_printf("PLT Relocations: %ld\n", 91 (obj->pltrelsize / sizeof(Elf_Rel))); 92 dump_Elf_Rel(obj, obj->pltrel, obj->pltrelsize); 93 } 94 95 if (obj->pltrelasize) { 96 rtld_printf("PLT Relocations with Addend: %ld\n", 97 (obj->pltrelasize / sizeof(Elf_Rela))); 98 dump_Elf_Rela(obj, obj->pltrela, obj->pltrelasize); 99 } 100 } 101 102 void 103 dump_Elf_Rel (Obj_Entry *obj, const Elf_Rel *rel0, u_long relsize) 104 { 105 const Elf_Rel *rel; 106 const Elf_Rel *rellim; 107 const Elf_Sym *sym; 108 Elf_Addr *dstaddr; 109 110 rtld_putstr(rel_header); 111 rellim = (const Elf_Rel *)((const char *)rel0 + relsize); 112 for (rel = rel0; rel < rellim; rel++) { 113 dstaddr = (Elf_Addr *)(obj->relocbase + rel->r_offset); 114 sym = obj->symtab + ELF_R_SYM(rel->r_info); 115 rtld_printf(rel_format, 116 obj->strtab + sym->st_name, 117 (u_long)rel->r_info, (u_long)rel->r_offset, 118 (u_long)sym->st_value, (int)sym->st_size, 119 dstaddr, (u_long)*dstaddr); 120 } 121 return; 122 } 123 124 void 125 dump_Elf_Rela (Obj_Entry *obj, const Elf_Rela *rela0, u_long relasize) 126 { 127 const Elf_Rela *rela; 128 const Elf_Rela *relalim; 129 const Elf_Sym *sym; 130 Elf_Addr *dstaddr; 131 132 rtld_putstr(rel_header); 133 relalim = (const Elf_Rela *)((const char *)rela0 + relasize); 134 for (rela = rela0; rela < relalim; rela++) { 135 dstaddr = (Elf_Addr *)(obj->relocbase + rela->r_offset); 136 sym = obj->symtab + ELF_R_SYM(rela->r_info); 137 rtld_printf(rel_format, 138 obj->strtab + sym->st_name, 139 (u_long)rela->r_info, (u_long)rela->r_offset, 140 (u_long)sym->st_value, (int)sym->st_size, 141 dstaddr, (u_long)*dstaddr); 142 } 143 return; 144 } 145