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/*
* reloc_arm.c - position-independent ARM ELF shared object relocator
*
* Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
* Copyright (C) 1999 Hewlett-Packard Co.
* Contributed by David Mosberger <davidm@hpl.hp.com>.
*
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*
* This file is taken and modified from the gnu-efi project.
*/
#include <efi.h>
#include <elf.h>
efi_status_t _relocate(long ldbase, Elf32_Dyn *dyn, efi_handle_t image,
struct efi_system_table *systab)
{
long relsz = 0, relent = 0;
Elf32_Rel *rel = 0;
ulong *addr;
int i;
for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
switch (dyn[i].d_tag) {
case DT_REL:
rel = (Elf32_Rel *)((ulong)dyn[i].d_un.d_ptr
+ ldbase);
break;
case DT_RELSZ:
relsz = dyn[i].d_un.d_val;
break;
case DT_RELENT:
relent = dyn[i].d_un.d_val;
break;
default:
break;
}
}
if (!rel && relent == 0)
return EFI_SUCCESS;
if (!rel || relent == 0)
return EFI_LOAD_ERROR;
while (relsz > 0) {
/* apply the relocs */
switch (ELF32_R_TYPE(rel->r_info)) {
case R_ARM_NONE:
break;
case R_ARM_RELATIVE:
addr = (ulong *)(ldbase + rel->r_offset);
*addr += ldbase;
break;
default:
break;
}
rel = (Elf32_Rel *)((char *)rel + relent);
relsz -= relent;
}
return EFI_SUCCESS;
}