1 /* vi: set sw=4 ts=4: */
2 /* m68k ELF shared library loader suppport
4 * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
5 * David Engel, Hongjiu Lu and Mitch D'Souza
6 * Adapted to ELF/68k by Andreas Schwab.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. The name of the above contributors may not be
16 * used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #if defined (__SUPPORT_LD_DEBUG__)
33 static const char *_dl_reltypes[] =
36 "R_68K_32", "R_68K_16", "R_68K_8",
37 "R_68K_PC32", "R_68K_PC16", "R_68K_PC8",
38 "R_68K_GOT32", "R_68K_GOT16", "R_68K_GOT8",
39 "R_68K_GOT32O", "R_68K_GOT16O", "R_68K_GOT8O",
40 "R_68K_PLT32", "R_68K_PLT16", "R_68K_PLT8",
41 "R_68K_PLT32O", "R_68K_PLT16O", "R_68K_PLT8O",
42 "R_68K_COPY", "R_68K_GLOB_DAT", "R_68K_JMP_SLOT", "R_68K_RELATIVE",
47 /* Program to load an ELF binary on a linux system, and run it.
48 References to symbols in sharable libraries can be resolved by either
49 an ELF sharable library or a linux style of shared library. */
51 /* Disclaimer: I have never seen any AT&T source code for SVr4, nor have
52 I ever taken any courses on internals. This program was developed using
53 information available through the book "UNIX SYSTEM V RELEASE 4,
54 Programmers guide: Ansi C and Programming Support Tools", which did
55 a more than adequate job of explaining everything required to get this
59 unsigned int _dl_linux_resolver (int dummy1, int dummy2,
60 struct elf_resolve *tpnt, int reloc_entry)
63 Elf32_Rela *this_reloc;
70 unsigned int instr_addr;
72 rel_addr = tpnt->loadaddr + tpnt->dynamic_info[DT_JMPREL];
73 this_reloc = (Elf32_Rela *) (rel_addr + reloc_entry);
74 reloc_type = ELF32_R_TYPE (this_reloc->r_info);
75 symtab_index = ELF32_R_SYM (this_reloc->r_info);
77 symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB]
79 strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
82 if (unlikely(reloc_type != R_68K_JMP_SLOT))
84 _dl_dprintf (2, "%s: incorrect relocation type in jump relocations\n",
89 /* Address of jump instruction to fix up. */
90 instr_addr = (int) this_reloc->r_offset + (int) tpnt->loadaddr;
91 got_addr = (char **) instr_addr;
93 #ifdef __SUPPORT_LD_DEBUG__
94 if (_dl_debug_symbols) {
95 _dl_dprintf (2, "Resolving symbol %s\n", strtab + symtab[symtab_index].st_name);
99 /* Get the address of the GOT entry. */
100 new_addr = _dl_find_hash (strtab + symtab[symtab_index].st_name,
101 tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT);
102 if (unlikely(!new_addr))
104 _dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
105 _dl_progname, strtab + symtab[symtab_index].st_name);
108 #if defined (__SUPPORT_LD_DEBUG__)
109 if ((unsigned long) got_addr < 0x40000000)
111 if (_dl_debug_bindings)
113 _dl_dprintf(_dl_debug_file, "\nresolve function: %s",
114 strtab + symtab[symtab_index].st_name);
115 if(_dl_debug_detail) _dl_dprintf(_dl_debug_file,
116 "\tpatch %x ==> %x @ %x", *got_addr, new_addr, got_addr);
119 if (!_dl_debug_nofixups) {
120 *got_addr = new_addr;
123 *got_addr = new_addr;
126 return (unsigned int) new_addr;
129 void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
130 unsigned long rel_addr, unsigned long rel_size)
138 unsigned int *reloc_addr;
139 struct elf_resolve *tpnt = rpnt->dyn;
141 /* Now parse the relocation information. */
142 rpnt = (Elf32_Rela *) (rel_addr + tpnt->loadaddr);
143 rel_size = rel_size / sizeof (Elf32_Rela);
145 symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB]
147 strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
149 for (i = 0; i < rel_size; i++, rpnt++)
151 reloc_addr = (int *) (tpnt->loadaddr + (int) rpnt->r_offset);
152 reloc_type = ELF32_R_TYPE (rpnt->r_info);
153 symtab_index = ELF32_R_SYM (rpnt->r_info);
160 *reloc_addr += (unsigned int) tpnt->loadaddr;
163 _dl_dprintf (2, "%s: (LAZY) can't handle reloc type ", _dl_progname);
164 #if defined (__SUPPORT_LD_DEBUG__)
165 _dl_dprintf (2, "%s ", _dl_reltypes[reloc_type]);
168 _dl_dprintf (2, "'%s'", strtab + symtab[symtab_index].st_name);
169 _dl_dprintf (2, "\n");
175 int _dl_parse_relocation_information(struct dyn_elf *rpnt,
176 unsigned long rel_addr, unsigned long rel_size)
184 unsigned int *reloc_addr;
185 unsigned int symbol_addr;
187 struct elf_resolve *tpnt = rpnt->dyn;
188 /* Now parse the relocation information */
190 rpnt = (Elf32_Rela *) (rel_addr + tpnt->loadaddr);
191 rel_size = rel_size / sizeof (Elf32_Rela);
193 symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB]
195 strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
197 for (i = 0; i < rel_size; i++, rpnt++)
199 reloc_addr = (int *) (tpnt->loadaddr + (int) rpnt->r_offset);
200 reloc_type = ELF32_R_TYPE (rpnt->r_info);
201 symtab_index = ELF32_R_SYM (rpnt->r_info);
205 symbol_addr = (unsigned int)
206 _dl_find_hash (strtab + symtab[symtab_index].st_name,
207 tpnt->symbol_scope, tpnt,
208 elf_machine_type_class(reloc_type));
210 /* We want to allow undefined references to weak symbols -
211 this might have been intentional. We should not be
212 linking local symbols here, so all bases should be
215 && ELF32_ST_BIND (symtab[symtab_index].st_info) != STB_WEAK)
217 _dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
218 _dl_progname, strtab + symtab[symtab_index].st_name);
227 *(char *) reloc_addr = symbol_addr + rpnt->r_addend;
230 *(short *) reloc_addr = symbol_addr + rpnt->r_addend;
233 *reloc_addr = symbol_addr + rpnt->r_addend;
236 *(char *) reloc_addr = (symbol_addr + rpnt->r_addend
237 - (unsigned int) reloc_addr);
240 *(short *) reloc_addr = (symbol_addr + rpnt->r_addend
241 - (unsigned int) reloc_addr);
244 *reloc_addr = (symbol_addr + rpnt->r_addend
245 - (unsigned int) reloc_addr);
249 *reloc_addr = symbol_addr;
252 *reloc_addr = ((unsigned int) tpnt->loadaddr
253 /* Compatibility kludge. */
254 + (rpnt->r_addend ? : *reloc_addr));
257 _dl_memcpy ((void *) reloc_addr,
258 (void *) symbol_addr,
259 symtab[symtab_index].st_size);
262 _dl_dprintf (2, "%s: can't handle reloc type ", _dl_progname);
263 #if defined (__SUPPORT_LD_DEBUG__)
264 _dl_dprintf (2, "%s ", _dl_reltypes[reloc_type]);
267 _dl_dprintf (2, "'%s'", strtab + symtab[symtab_index].st_name);
268 _dl_dprintf (2, "\n");