diff options
Diffstat (limited to 'mdk-stage1/insmod-modutils/obj/obj_x86_64.c')
| -rw-r--r-- | mdk-stage1/insmod-modutils/obj/obj_x86_64.c | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/mdk-stage1/insmod-modutils/obj/obj_x86_64.c b/mdk-stage1/insmod-modutils/obj/obj_x86_64.c new file mode 100644 index 000000000..56dfeeabd --- /dev/null +++ b/mdk-stage1/insmod-modutils/obj/obj_x86_64.c @@ -0,0 +1,253 @@ +/* x86-64 specific support for Elf loading and relocation. + Copyright 2002 SuSE Linux AG. + + Contributed by Andreas Jaeger <aj@suse.de>. + + This file is part of the Linux modutils. + + This program is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the + Free Software Foundation; either version 2 of the License, or (at your + option) any later version. + + This program is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#ident "$Id$" + +#include <string.h> +#include <assert.h> + +#include <module.h> +#include <obj.h> +#include <util.h> + +/*======================================================================*/ + +struct x86_64_got_entry +{ + long int offset; + unsigned offset_done : 1; + unsigned reloc_done : 1; +}; + +struct x86_64_file +{ + struct obj_file root; + struct obj_section *got; +}; + +struct x86_64_symbol +{ + struct obj_symbol root; + struct x86_64_got_entry gotent; +}; + + +/*======================================================================*/ + +struct obj_file * +arch_new_file (void) +{ + struct x86_64_file *f; + f = xmalloc(sizeof(*f)); + f->got = NULL; + return &f->root; +} + +struct obj_section * +arch_new_section (void) +{ + return xmalloc(sizeof(struct obj_section)); +} + +struct obj_symbol * +arch_new_symbol (void) +{ + struct x86_64_symbol *sym; + sym = xmalloc(sizeof(*sym)); + memset(&sym->gotent, 0, sizeof(sym->gotent)); + return &sym->root; +} + +int +arch_load_proc_section(struct obj_section *sec, int fp) +{ + /* Assume it's just a debugging section that we can safely + ignore ... */ + sec->contents = NULL; + + return 0; +} + +enum obj_reloc +arch_apply_relocation (struct obj_file *f, + struct obj_section *targsec, + struct obj_section *symsec, + struct obj_symbol *sym, + Elf64_Rela *rel, + Elf64_Addr v) +{ + struct x86_64_file *ifile = (struct x86_64_file *)f; + struct x86_64_symbol *isym = (struct x86_64_symbol *)sym; + + Elf64_Addr *loc = (Elf64_Addr *)(targsec->contents + rel->r_offset); + Elf64_Addr dot = targsec->header.sh_addr + rel->r_offset; + Elf64_Addr got = ifile->got ? ifile->got->header.sh_addr : 0; + + enum obj_reloc ret = obj_reloc_ok; + + switch (ELF64_R_TYPE(rel->r_info)) + { + case R_X86_64_NONE: + break; + + case R_X86_64_64: + *loc += v; + break; + + case R_X86_64_32: + *(unsigned int *) loc += v; + break; + + case R_X86_64_32S: + *(signed int *) loc += v; + break; + + case R_X86_64_16: + *(unsigned short *) loc += v; + break; + + case R_X86_64_8: + *(unsigned char *) loc += v; + break; + + case R_X86_64_PC32: + *(unsigned int *) loc += v - dot; + break; + + case R_X86_64_PC16: + *(unsigned short *) loc += v - dot; + break; + + case R_X86_64_PC8: + *(unsigned char *) loc += v - dot; + break; + + case R_X86_64_GLOB_DAT: + case R_X86_64_JUMP_SLOT: + *loc = v; + break; + + case R_X86_64_RELATIVE: + *loc += f->baseaddr; + break; + + case R_X86_64_GOT32: + case R_X86_64_GOTPCREL: + assert(isym != NULL); + if (!isym->gotent.reloc_done) + { + isym->gotent.reloc_done = 1; + *(Elf64_Addr *)(ifile->got->contents + isym->gotent.offset) = v; + } + /* XXX are these really correct? */ + if (ELF64_R_TYPE(rel->r_info) == R_X86_64_GOTPCREL) + *(unsigned int *) loc += v + isym->gotent.offset; + else + *loc += isym->gotent.offset; + break; + + default: + ret = obj_reloc_unhandled; + break; + } + + return ret; +} + +int +arch_create_got (struct obj_file *f) +{ + struct x86_64_file *ifile = (struct x86_64_file *)f; + int i, n, offset = 0, gotneeded = 0; + + n = ifile->root.header.e_shnum; + for (i = 0; i < n; ++i) + { + struct obj_section *relsec, *symsec, *strsec; + Elf64_Rela *rel, *relend; + Elf64_Sym *symtab; + const char *strtab; + + relsec = ifile->root.sections[i]; + if (relsec->header.sh_type != SHT_REL) + continue; + + symsec = ifile->root.sections[relsec->header.sh_link]; + strsec = ifile->root.sections[symsec->header.sh_link]; + + rel = (Elf64_Rela *)relsec->contents; + relend = rel + (relsec->header.sh_size / sizeof(Elf64_Rela)); + symtab = (Elf64_Sym *)symsec->contents; + strtab = (const char *)strsec->contents; + + for (; rel < relend; ++rel) + { + struct x86_64_symbol *intsym; + + switch (ELF64_R_TYPE(rel->r_info)) + { + case R_X86_64_GOTPCREL: + case R_X86_64_GOT32: + gotneeded = 1; + default: + continue; + } + + obj_find_relsym(intsym, f, &ifile->root, rel, symtab, strtab); + + if (!intsym->gotent.offset_done) + { + intsym->gotent.offset_done = 1; + intsym->gotent.offset = offset; + offset += 4; + } + } + } + + if (offset > 0 || gotneeded) + ifile->got = obj_create_alloced_section(&ifile->root, ".got", 8, offset, + SHF_WRITE); + + return 1; +} + +int +arch_init_module (struct obj_file *f, struct module *mod) +{ + return 1; +} + +int +arch_finalize_section_address(struct obj_file *f, Elf64_Addr base) +{ + int i, n = f->header.e_shnum; + + f->baseaddr = base; + for (i = 0; i < n; ++i) + f->sections[i]->header.sh_addr += base; + return 1; +} + +int +arch_archdata (struct obj_file *fin, struct obj_section *sec) +{ + return 0; +} |