diff options
Diffstat (limited to 'ldso/ldso/avr32/elfinterp.c')
| -rw-r--r-- | ldso/ldso/avr32/elfinterp.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/ldso/ldso/avr32/elfinterp.c b/ldso/ldso/avr32/elfinterp.c new file mode 100644 index 000000000..e236e4825 --- /dev/null +++ b/ldso/ldso/avr32/elfinterp.c @@ -0,0 +1,193 @@ +/* + * AVR32 ELF shared library loader suppport + * + * Copyright (C) 2004-2006 Atmel Corporation + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. The name of the above contributors may not be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +unsigned long _dl_linux_resolver(unsigned long got_offset, unsigned long *got) +{ + /* + * AVR32 currently does not do lazy relocation. + */ +#if 0 + struct elf_resolve *tpnt = (struct elf_resolve *)got[1]; + Elf32_Sym *sym; + unsigned long local_gotno; + unsigned long gotsym; + unsigned long new_addr; + char *strtab, *symname; + unsigned long *entry; + unsigned long sym_index = got_offset / 4; + + local_gotno = tpnt->dynamic_info[DT_AVR32_LOCAL_GOTNO]; + gotsym = tpnt->dynamic_info[DT_AVR32_GOTSYM]; + + sym = ((Elf32_Sym *)(tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr)) + + sym_index; + strtab = (char *)(tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr); + symname = strtab + sym->st_name; + + new_addr = (unsigned long) _dl_find_hash(strtab + sym->st_name, + tpnt->symbol_scope, tpnt, + resolver); + + entry = (unsigned long *)(got + local_gotno + sym_index - gotsym); + *entry = new_addr; + + return new_addr; +#endif + return 0; +} + +static int +_dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope, + unsigned long rel_addr, unsigned long rel_size, + int (*reloc_func)(struct elf_resolve *tpnt, struct dyn_elf *scope, + Elf32_Rela *rpnt, Elf32_Sym *symtab, char *strtab)) +{ + Elf32_Sym *symtab; + Elf32_Rela *rpnt; + char *strtab; + int i; + + rpnt = (Elf32_Rela *)rel_addr; + rel_size /= sizeof(Elf32_Rela); + symtab = (Elf32_Sym *)tpnt->dynamic_info[DT_SYMTAB]; + strtab = (char *)tpnt->dynamic_info[DT_STRTAB]; + + for (i = 0; i < rel_size; i++, rpnt++) { + int symtab_index, res; + + symtab_index = ELF32_R_SYM(rpnt->r_info); + + debug_sym(symtab, strtab, symtab_index); + debug_reloc(symtab, strtab, rpnt); + + res = reloc_func(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 { + _dl_dprintf(2, "can't resolve symbol\n"); + return res; + } + } + + return 0; +} + +static int _dl_do_reloc(struct elf_resolve *tpnt, struct dyn_elf *scope, + Elf32_Rela *rpnt, Elf32_Sym *symtab, char *strtab) +{ + int reloc_type; + int symtab_index; + char *symname; + unsigned long *reloc_addr; + unsigned long symbol_addr; +#if defined(__SUPPORT_LD_DEBUG__) + unsigned long old_val; +#endif + + reloc_addr = (unsigned long *)(tpnt->loadaddr + rpnt->r_offset); + reloc_type = ELF32_R_TYPE(rpnt->r_info); + symtab_index = ELF32_R_SYM(rpnt->r_info); + symbol_addr = 0; + symname = strtab + symtab[symtab_index].st_name; + + if (symtab_index) { + symbol_addr = (unsigned long) + _dl_find_hash(strtab + symtab[symtab_index].st_name, + tpnt->symbol_scope, tpnt, + elf_machine_type_class(reloc_type)); + + /* Allow undefined references to weak symbols */ + 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, symname); + return 0; + } + } + +#if defined(__SUPPORT_LD_DEBUG__) + old_val = *reloc_addr; +#endif + switch (reloc_type) { + case R_AVR32_NONE: + break; + case R_AVR32_GLOB_DAT: + case R_AVR32_JMP_SLOT: + *reloc_addr = symbol_addr + rpnt->r_addend; + break; + case R_AVR32_RELATIVE: + *reloc_addr = (unsigned long)tpnt->loadaddr + + rpnt->r_addend; + break; + default: + return -1; + } + +#if defined(__SUPPORT_LD_DEBUG__) + if (_dl_debug_reloc && _dl_debug_detail) + _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n", + old_val, *reloc_addr); +#endif + + return 0; +} + +void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt, + unsigned long rel_addr, + unsigned long rel_size) +{ + /* TODO: Might want to support this in order to get faster + * startup times... */ +} + +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); +} |