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2726 vana 1
/* reloc_ia32.c - position independent x86 ELF shared object relocator
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   Copyright (C) 1999 Hewlett-Packard Co.
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    Contributed by David Mosberger <davidm@hpl.hp.com>.
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   This file is part of GNU-EFI, the GNU EFI development environment.
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   GNU EFI is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 2, or (at your option)
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   any later version.
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   GNU EFI is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with GNU EFI; see the file COPYING.  If not, write to the Free
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   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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   02111-1307, USA. */
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#include <elf.h>
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#include <link.h>   /* get _DYNAMIC decl and ElfW and ELFW macros */
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#undef NULL
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#define uint64_t    efi_uint64_t
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#define int64_t     efi_int64_t
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#define uint32_t    efi_uint32_t
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#define int32_t     efi_int32_t
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#define uint16_t    efi_uint16_t
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#define int16_t     efi_int16_t
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#define uint8_t     efi_uint8_t
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#define int8_t      efi_int8_t
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#undef NULL
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#define uint64_t    efi_uint64_t
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#define int64_t     efi_int64_t
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#define uint32_t    efi_uint32_t
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#define int32_t     efi_int32_t
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#define uint16_t    efi_uint16_t
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#define int16_t     efi_int16_t
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#define uint8_t     efi_uint8_t
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#define int8_t      efi_int8_t
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#include <efi.h>
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#include <efilib.h>
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int
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_relocate (long ldbase, ElfW(Dyn) *dyn, EFI_HANDLE image, EFI_SYSTEM_TABLE *systab)
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{
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    extern EFI_STATUS efi_main (EFI_HANDLE, EFI_SYSTEM_TABLE *);
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    long relsz = 0, relent = 0;
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    ElfW(Rel) *rel = 0;
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    int i;
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    for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
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        switch (dyn[i].d_tag) {
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              case DT_REL:
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            rel = (ElfW(Rel)*) ((long) dyn[i].d_un.d_ptr + ldbase);
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            break;
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              case DT_RELSZ:
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            relsz = dyn[i].d_un.d_val;
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            break;
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              case DT_RELENT:
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            relent = dyn[i].d_un.d_val;
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            break;
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              case DT_RELA:
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            break;
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              default:
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            break;
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        }
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    }
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    while (relsz > 0) {
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        if (!rel || relent == 0)
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            return EFI_LOAD_ERROR;
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        /* apply the relocs */
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        switch (ELF32_R_TYPE (rel->r_info)) {
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              case R_386_NONE:
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            break;
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              case R_386_RELATIVE:
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              {
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                  long *addr;
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                  addr = (long *) (ldbase + rel->r_offset);
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                  *addr += ldbase;
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                  break;
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              }
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              default:
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            return EFI_LOAD_ERROR;
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        }
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        rel = (ElfW(Rel)*) ((char *) rel + relent);
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        relsz -= relent;
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    }
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    return EFI_SUCCESS;
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}