1 /* vi: set sw=4 ts=4: */
2 /* sparc ELF shared library loader suppport
4 * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
5 * David Engel, Hongjiu Lu and Mitch D'Souza
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. The name of the above contributors may not be
15 * used to endorse or promote products derived from this software
16 * without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #if defined (__SUPPORT_LD_DEBUG__)
32 static const char * _dl_reltypes[] = { "R_SPARC_NONE", "R_SPARC_8",
33 "R_SPARC_16", "R_SPARC_32", "R_SPARC_DISP8", "R_SPARC_DISP16",
34 "R_SPARC_DISP32", "R_SPARC_WDISP30", "R_SPARC_WDISP22",
35 "R_SPARC_HI22", "R_SPARC_22", "R_SPARC_13", "R_SPARC_LO10",
36 "R_SPARC_GOT10", "R_SPARC_GOT13", "R_SPARC_GOT22", "R_SPARC_PC10",
37 "R_SPARC_PC22", "R_SPARC_WPLT30", "R_SPARC_COPY",
38 "R_SPARC_GLOB_DAT", "R_SPARC_JMP_SLOT", "R_SPARC_RELATIVE",
42 /* Program to load an ELF binary on a linux system, and run it.
43 References to symbols in sharable libraries can be resolved by either
44 an ELF sharable library or a linux style of shared library. */
46 /* Disclaimer: I have never seen any AT&T source code for SVr4, nor have
47 I ever taken any courses on internals. This program was developed using
48 information available through the book "UNIX SYSTEM V RELEASE 4,
49 Programmers guide: Ansi C and Programming Support Tools", which did
50 a more than adequate job of explaining everything required to get this
53 extern _dl_linux_resolve(void);
55 unsigned int _dl_linux_resolver(unsigned int reloc_entry, unsigned int * plt)
58 Elf32_Rela * this_reloc;
61 Elf32_Rela * rel_addr;
62 struct elf_resolve * tpnt;
66 unsigned int instr_addr;
67 tpnt = (struct elf_resolve *) plt[2];
69 rel_addr = (Elf32_Rela *) (tpnt->dynamic_info[DT_JMPREL] +
73 * Generate the correct relocation index into the .rela.plt section.
75 reloc_entry = (reloc_entry >> 10) - 0xc;
77 this_reloc = (Elf32_Rela *) ((char *) rel_addr + reloc_entry);
79 reloc_type = ELF32_R_TYPE(this_reloc->r_info);
80 symtab_index = ELF32_R_SYM(this_reloc->r_info);
82 symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
83 strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
85 #ifdef __SUPPORT_LD_DEBUG__
86 if (_dl_debug_symbols) {
87 _dl_dprintf(2, "tpnt = %x\n", tpnt);
88 _dl_dprintf(2, "reloc = %x\n", this_reloc);
89 _dl_dprintf(2, "symtab = %x\n", symtab);
90 _dl_dprintf(2, "strtab = %x\n", strtab);
95 if (unlikely(reloc_type != R_SPARC_JMP_SLOT)) {
96 _dl_dprintf(2, "%s: incorrect relocation type in jump relocations (%d)\n",
97 _dl_progname, reloc_type);
101 /* Address of jump instruction to fix up */
102 instr_addr = ((int)this_reloc->r_offset + (int)tpnt->loadaddr);
103 got_addr = (char **) instr_addr;
105 #ifdef __SUPPORT_LD_DEBUG__
106 if (_dl_debug_symbols) {
107 _dl_dprintf(2, "symtab_index %x\n", symtab_index);
109 _dl_dprintf(2, "Resolving symbol %s\n",
110 strtab + symtab[symtab_index].st_name);
114 /* Get the address of the GOT entry */
115 new_addr = _dl_find_hash(strtab + symtab[symtab_index].st_name,
116 tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
117 if(unlikely(!new_addr)) {
118 _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
119 _dl_progname, strtab + symtab[symtab_index].st_name);
123 #if defined (__SUPPORT_LD_DEBUG__)
124 if ((unsigned long) got_addr < 0x40000000)
126 if (_dl_debug_bindings)
128 _dl_dprintf(_dl_debug_file, "\nresolve function: %s",
129 strtab + symtab[symtab_index].st_name);
130 if(_dl_debug_detail) _dl_dprintf(_dl_debug_file,
131 "\tpatch %x ==> %x @ %x", *got_addr, new_addr, got_addr);
134 if (!_dl_debug_nofixups) {
135 got_addr[1] = (char *) (0x03000000 | (((unsigned int) new_addr >> 10) & 0x3fffff));
136 got_addr[2] = (char *) (0x81c06000 | ((unsigned int) new_addr & 0x3ff));
139 got_addr[1] = (char *) (0x03000000 | (((unsigned int) new_addr >> 10) & 0x3fffff));
140 got_addr[2] = (char *) (0x81c06000 | ((unsigned int) new_addr & 0x3ff));
143 _dl_dprintf(2, "Address = %x\n",new_addr);
146 return (unsigned int) new_addr;
149 void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
150 unsigned long rel_addr, unsigned long rel_size, int type)
158 unsigned int * reloc_addr;
159 struct elf_resolve * tpnt = rpnt->dyn;
161 /* Now parse the relocation information */
162 rpnt = (Elf32_Rela *) (rel_addr + tpnt->loadaddr);
164 symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
165 strtab = ( char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
167 for(i=0; i< rel_size; i += sizeof(Elf32_Rela), rpnt++){
168 reloc_addr = (int *) (tpnt->loadaddr + (int)rpnt->r_offset);
169 reloc_type = ELF32_R_TYPE(rpnt->r_info);
170 symtab_index = ELF32_R_SYM(rpnt->r_info);
172 /* When the dynamic linker bootstrapped itself, it resolved some symbols.
173 Make sure we do not do them again */
174 if(!symtab_index && tpnt->libtype == program_interpreter) continue;
175 if(symtab_index && tpnt->libtype == program_interpreter &&
176 _dl_symbol(strtab + symtab[symtab_index].st_name))
182 case R_SPARC_JMP_SLOT:
185 _dl_dprintf(2, "%s: (LAZY) can't handle reloc type ", _dl_progname);
186 #if defined (__SUPPORT_LD_DEBUG__)
187 _dl_dprintf(2, "%s ", _dl_reltypes[reloc_type]);
189 if(symtab_index) _dl_dprintf(2, "'%s'\n",
190 strtab + symtab[symtab_index].st_name);
196 int _dl_parse_relocation_information(struct dyn_elf *rpnt,
197 unsigned long rel_addr, unsigned long rel_size, int type)
205 unsigned int * reloc_addr;
206 unsigned int symbol_addr;
208 struct elf_resolve * tpnt = rpnt->dyn;
209 /* Now parse the relocation information */
211 rpnt = (Elf32_Rela *) (rel_addr + tpnt->loadaddr);
213 symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
214 strtab = ( char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
216 for(i=0; i< rel_size; i+= sizeof(Elf32_Rela), rpnt++){
217 reloc_addr = (int *) (tpnt->loadaddr + (int)rpnt->r_offset);
218 reloc_type = ELF32_R_TYPE(rpnt->r_info);
219 symtab_index = ELF32_R_SYM(rpnt->r_info);
222 if(!symtab_index && tpnt->libtype == program_interpreter) continue;
226 if(tpnt->libtype == program_interpreter &&
227 _dl_symbol(strtab + symtab[symtab_index].st_name))
230 symbol_addr = (unsigned int)
231 _dl_find_hash(strtab + symtab[symtab_index].st_name,
232 tpnt->symbol_scope, elf_machine_type_class(reloc_type));
235 ELF32_ST_BIND(symtab [symtab_index].st_info) == STB_GLOBAL) {
236 _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
237 _dl_progname, strtab + symtab[symtab_index].st_name);
245 *reloc_addr = symbol_addr + rpnt->r_addend;
248 *reloc_addr = symbol_addr + rpnt->r_addend - (unsigned int) reloc_addr;
250 case R_SPARC_GLOB_DAT:
251 *reloc_addr = symbol_addr + rpnt->r_addend;
253 case R_SPARC_JMP_SLOT:
254 reloc_addr[1] = 0x03000000 | ((symbol_addr >> 10) & 0x3fffff);
255 reloc_addr[2] = 0x81c06000 | (symbol_addr & 0x3ff);
257 case R_SPARC_RELATIVE:
258 *reloc_addr += (unsigned int) tpnt->loadaddr + rpnt->r_addend;
262 symbol_addr = tpnt->loadaddr + rpnt->r_addend;
264 symbol_addr += rpnt->r_addend;
265 *reloc_addr = (*reloc_addr & 0xffc00000)|(symbol_addr >> 10);
269 symbol_addr = tpnt->loadaddr + rpnt->r_addend;
271 symbol_addr += rpnt->r_addend;
272 *reloc_addr = (*reloc_addr & ~0x3ff)|(symbol_addr & 0x3ff);
274 case R_SPARC_WDISP30:
275 *reloc_addr = (*reloc_addr & 0xc0000000)|
276 ((symbol_addr - (unsigned int) reloc_addr) >> 2);
279 #if 0 /* This one is done later */
280 _dl_dprintf(2, "Doing copy for symbol ");
281 if(symtab_index) _dl_dprintf(2, strtab + symtab[symtab_index].st_name);
282 _dl_dprintf(2, "\n");
283 _dl_memcpy((void *) symtab[symtab_index].st_value,
284 (void *) symbol_addr,
285 symtab[symtab_index].st_size);
289 _dl_dprintf(2, "%s: can't handle reloc type ", _dl_progname);
290 #if defined (__SUPPORT_LD_DEBUG__)
291 _dl_dprintf(2, "%s ", _dl_reltypes[reloc_type]);
294 _dl_dprintf(2, "'%s'\n", strtab + symtab[symtab_index].st_name);
303 /* This is done as a separate step, because there are cases where
304 information is first copied and later initialized. This results in
305 the wrong information being copied. Someone at Sun was complaining about
306 a bug in the handling of _COPY by SVr4, and this may in fact be what he
307 was talking about. Sigh. */
309 /* No, there are cases where the SVr4 linker fails to emit COPY relocs
312 int _dl_parse_copy_information(struct dyn_elf *xpnt,
313 unsigned long rel_addr, unsigned long rel_size, int type)
321 unsigned int * reloc_addr;
322 unsigned int symbol_addr;
323 struct elf_resolve *tpnt;
325 /* Now parse the relocation information */
329 rpnt = (Elf32_Rela *) (rel_addr + tpnt->loadaddr);
331 symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
332 strtab = ( char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
334 for(i=0; i< rel_size; i+= sizeof(Elf32_Rela), rpnt++){
335 reloc_addr = (int *) (tpnt->loadaddr + (int)rpnt->r_offset);
336 reloc_type = ELF32_R_TYPE(rpnt->r_info);
337 if(reloc_type != R_SPARC_COPY) continue;
338 symtab_index = ELF32_R_SYM(rpnt->r_info);
340 if(!symtab_index && tpnt->libtype == program_interpreter) continue;
343 if(tpnt->libtype == program_interpreter &&
344 _dl_symbol(strtab + symtab[symtab_index].st_name))
347 symbol_addr = (unsigned int)
348 _dl_find_hash(strtab + symtab[symtab_index].st_name,
349 xpnt->next, ELF_RTYPE_CLASS_COPY);
351 _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
352 _dl_progname, strtab + symtab[symtab_index].st_name);
357 _dl_memcpy((char *) symtab[symtab_index].st_value,
358 (char *) symbol_addr,
359 symtab[symtab_index].st_size);