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- /* TI C64X DSBT ELF shared library loader suppport
- * Copyright (C) 2010 Texas Instruments Incorporated
- * Contributed by Mark Salter <msalter@redhat.com>
- *
- * Borrowed heavily from frv arch:
- * Copyright (C) 2003, 2004 Red Hat, Inc.
- * Contributed by Alexandre Oliva <aoliva@redhat.com>
- * Lots of code copied from ../i386/elfinterp.c, so:
- * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
- * David Engel, Hongjiu Lu and Mitch D'Souza
- * Copyright (C) 2001-2002, Erik Andersen
- * All rights reserved.
- *
- * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
- */
- #include <features.h>
- /* Program to load an ELF binary on a linux system, and run it.
- References to symbols in sharable libraries can be resolved by either
- an ELF sharable library or a linux style of shared library. */
- /* Disclaimer: I have never seen any AT&T source code for SVr4, nor have
- I ever taken any courses on internals. This program was developed using
- information available through the book "UNIX SYSTEM V RELEASE 4,
- Programmers guide: Ansi C and Programming Support Tools", which did
- a more than adequate job of explaining everything required to get this
- working. */
- extern void __c6x_cache_sync(unsigned long start, unsigned long end)
- attribute_hidden;
- static void
- _dl_c6x_flush_relocs(struct elf32_dsbt_loadmap *map)
- {
- unsigned long s, e;
- s = map->segs[0].addr;
- e = s + map->segs[0].p_memsz;
- __c6x_cache_sync(s, e);
- s = map->segs[1].addr;
- e = s + map->segs[1].p_memsz;
- __c6x_cache_sync(s, e);
- }
- attribute_hidden
- char *
- _dl_linux_resolver (struct elf_resolve *tpnt, int reloc_entry)
- {
- ELF_RELOC *this_reloc;
- char *strtab;
- ElfW(Sym) *symtab;
- int symtab_index;
- char *rel_addr;
- char *new_addr;
- char **got_addr;
- char *symname;
- rel_addr = (char *)tpnt->dynamic_info[DT_JMPREL];
- this_reloc = (ELF_RELOC *)(intptr_t)(rel_addr + reloc_entry);
- symtab_index = ELF_R_SYM(this_reloc->r_info);
- symtab = (Elf32_Sym *) tpnt->dynamic_info[DT_SYMTAB];
- strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
- symname = strtab + symtab[symtab_index].st_name;
- /* Address of GOT entry fix up */
- got_addr = (char **) DL_RELOC_ADDR(tpnt->loadaddr, this_reloc->r_offset);
- /* Get the address to be used to fill in the GOT entry. */
- new_addr = _dl_find_hash(symname, tpnt->symbol_scope, tpnt,
- ELF_RTYPE_CLASS_PLT, NULL);
- if (unlikely(!new_addr)) {
- _dl_dprintf(2, "%s: can't resolve symbol '%s' in lib '%s'.\n", _dl_progname, symname, tpnt->libname);
- _dl_exit(1);
- }
- #if defined (__SUPPORT_LD_DEBUG__)
- if (_dl_debug_bindings) {
- _dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
- if (_dl_debug_detail)
- _dl_dprintf(_dl_debug_file,
- "\n\tpatched %x ==> %x @ %x\n",
- *got_addr, new_addr, got_addr);
- }
- if (!_dl_debug_nofixups) {
- *got_addr = new_addr;
- }
- #else
- *got_addr = new_addr;
- #endif
- return new_addr;
- }
- static int
- _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
- unsigned long rel_addr, unsigned long rel_size,
- int (*reloc_fnc) (struct elf_resolve *tpnt, struct dyn_elf *scope,
- ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab))
- {
- unsigned int i;
- char *strtab;
- Elf32_Sym *symtab;
- ELF_RELOC *rpnt;
- int symtab_index;
- /* Now parse the relocation information */
- rpnt = (ELF_RELOC *)rel_addr;
- rel_size = rel_size / sizeof(ELF_RELOC);
- symtab = (Elf32_Sym *)tpnt->dynamic_info[DT_SYMTAB];
- strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
- for (i = 0; i < rel_size; i++, rpnt++) {
- int res;
- symtab_index = ELF32_R_SYM(rpnt->r_info);
- debug_sym(symtab,strtab,symtab_index);
- debug_reloc(symtab,strtab,rpnt);
- res = reloc_fnc (tpnt, scope, rpnt, symtab, strtab);
- if (res==0) continue;
- _dl_dprintf(2, "\n%s: ",_dl_progname);
- if (symtab_index)
- _dl_dprintf(2, "symbol '%s': ", strtab + symtab[symtab_index].st_name);
- if (res <0) {
- int reloc_type = ELF32_R_TYPE(rpnt->r_info);
- #if defined (__SUPPORT_LD_DEBUG__)
- _dl_dprintf(2, "can't handle reloc type %s\n ", _dl_reltypes(reloc_type));
- #else
- _dl_dprintf(2, "can't handle reloc type %x\n", reloc_type);
- #endif
- _dl_exit(-res);
- } else if (res >0) {
- _dl_dprintf(2, "can't resolve symbol\n");
- return res;
- }
- }
- _dl_c6x_flush_relocs(tpnt->loadaddr.map);
- return 0;
- }
- static int
- _dl_do_reloc (struct elf_resolve *tpnt,struct dyn_elf *scope,
- ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab)
- {
- int reloc_type;
- int symtab_index;
- char *symname;
- unsigned long *reloc_addr;
- unsigned long symbol_addr, sym_val;
- long reloc_addend;
- unsigned long old_val, new_val;
- reloc_addr = (unsigned long *)(intptr_t)
- DL_RELOC_ADDR (tpnt->loadaddr, rpnt->r_offset);
- reloc_type = ELF32_R_TYPE(rpnt->r_info);
- reloc_addend = rpnt->r_addend;
- symtab_index = ELF32_R_SYM(rpnt->r_info);
- symbol_addr = 0;
- symname = strtab + symtab[symtab_index].st_name;
- if (ELF32_ST_BIND (symtab[symtab_index].st_info) == STB_LOCAL) {
- symbol_addr = (unsigned long)
- DL_RELOC_ADDR (tpnt->loadaddr, symtab[symtab_index].st_value);
- } else {
- symbol_addr = (unsigned long) _dl_find_hash(strtab + symtab[symtab_index].st_name,
- scope, tpnt, elf_machine_type_class(reloc_type),
- NULL);
- /*
- * We want to allow undefined references to weak symbols - this might
- * have been intentional. We should not be linking local symbols
- * here, so all bases should be covered.
- */
- if (!symbol_addr && ELF32_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK) {
- _dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
- _dl_progname, strtab + symtab[symtab_index].st_name);
- _dl_exit (1);
- }
- }
- old_val = *reloc_addr;
- sym_val = symbol_addr + reloc_addend;
- switch (reloc_type) {
- case R_C6000_NONE:
- break;
- case R_C6000_ABS32:
- case R_C6000_JUMP_SLOT:
- new_val = sym_val;
- *reloc_addr = sym_val;
- break;
- case R_C6000_DSBT_INDEX:
- new_val = (old_val & ~0x007fff00) | ((tpnt->loadaddr.map->dsbt_index & 0x7fff) << 8);
- *reloc_addr = new_val;
- break;
- case R_C6000_ABS_L16:
- new_val = (old_val & ~0x007fff80) | ((sym_val & 0xffff) << 7);
- *reloc_addr = new_val;
- break;
- case R_C6000_ABS_H16:
- new_val = (old_val & ~0x007fff80) | ((sym_val >> 9) & 0x007fff80);
- *reloc_addr = new_val;
- break;
- case R_C6000_PCR_S21:
- new_val = sym_val - (((unsigned long)reloc_addr) & ~31);
- *reloc_addr = (old_val & ~0x0fffff80) | (((new_val >> 2) & 0x1fffff) << 7);
- break;
- case R_C6000_COPY:
- if (symbol_addr) {
- #if defined (__SUPPORT_LD_DEBUG__)
- if (_dl_debug_move)
- _dl_dprintf(_dl_debug_file,
- "\n%s move %d bytes from %x to %x",
- symname, symtab[symtab_index].st_size,
- symbol_addr, reloc_addr);
- #endif
-
- _dl_memcpy((char *)reloc_addr,
- (char *)symbol_addr,
- symtab[symtab_index].st_size);
- }
- return 0;
- default:
- return -1; /*call _dl_exit(1) */
- }
- #if defined (__SUPPORT_LD_DEBUG__)
- if (_dl_debug_reloc && _dl_debug_detail && reloc_type != R_C6000_NONE) {
- _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n", old_val, new_val, reloc_addr);
- }
- #endif
- return 0;
- }
- static int
- _dl_do_lazy_reloc (struct elf_resolve *tpnt,
- struct dyn_elf *scope attribute_unused,
- ELF_RELOC *rpnt, ElfW(Sym) *symtab attribute_unused,
- char *strtab attribute_unused)
- {
- int reloc_type;
- unsigned long *reloc_addr;
- unsigned long old_val;
- reloc_addr = (unsigned long *) DL_RELOC_ADDR(tpnt->loadaddr, rpnt->r_offset);
- reloc_type = ELF_R_TYPE(rpnt->r_info);
- old_val = *reloc_addr;
- switch (reloc_type) {
- case R_C6000_NONE:
- break;
- case R_C6000_JUMP_SLOT:
- *reloc_addr = DL_RELOC_ADDR(tpnt->loadaddr, old_val);
- break;
- default:
- return -1;
- }
- #if defined (__SUPPORT_LD_DEBUG__)
- if (_dl_debug_reloc && _dl_debug_detail)
- _dl_dprintf(_dl_debug_file, "\n\tpatched: %x ==> %x @ %x\n",
- old_val, *reloc_addr, reloc_addr);
- #endif
- return 0;
- }
- void
- _dl_parse_lazy_relocation_information
- (struct dyn_elf *rpnt, unsigned long rel_addr, unsigned long rel_size)
- {
- _dl_parse(rpnt->dyn, NULL, rel_addr, rel_size, _dl_do_lazy_reloc);
- }
- int
- _dl_parse_relocation_information
- (struct dyn_elf *rpnt, unsigned long rel_addr, unsigned long rel_size)
- {
- return _dl_parse(rpnt->dyn, rpnt->dyn->symbol_scope, rel_addr, rel_size, _dl_do_reloc);
- }
- /* We don't have copy relocs. */
- int
- _dl_parse_copy_information
- (struct dyn_elf *rpnt,
- unsigned long rel_addr,
- unsigned long rel_size)
- {
- return 0;
- }
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