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
debug_printf(const char * format,...)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
dump_relocations(Obj_Entry * obj0)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
dump_obj_relocations(Obj_Entry * obj)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
dump_Elf_Rel(Obj_Entry * obj,const Elf_Rel * rel0,u_long relsize)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
dump_Elf_Rela(Obj_Entry * obj,const Elf_Rela * rela0,u_long relasize)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