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// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
/*
* Relocate ourselves
*
* WARNING: This code is used to self-relocate, it cannot have any
* global reference nor TOC reference. It's also called before BSS
* is cleared.
*
* Copyright 2013-2015 IBM Corp.
*/
#include <stdbool.h>
#include <elf.h>
/* Called from head.S, thus no header. */
int relocate(uint64_t offset, struct elf64_dyn *dyn, struct elf64_rela *rela);
/* Note: This code is simplified according to the assumptions
* that our link address is 0 and we are running at the
* target address already.
*/
int relocate(uint64_t offset, struct elf64_dyn *dyn, struct elf64_rela *rela)
{
uint64_t dt_rela = 0;
uint64_t dt_relacount = 0;
unsigned int i;
/* Look for relocation table */
for (; dyn->d_tag != DT_NULL; dyn++) {
if (dyn->d_tag == DT_RELA)
dt_rela = dyn->d_val;
else if (dyn->d_tag == DT_RELACOUNT)
dt_relacount = dyn->d_val;
}
/* If we miss either rela or relacount, bail */
if (!dt_rela || !dt_relacount)
return -1;
/* Check if the offset is consistent */
if ((offset + dt_rela) != (uint64_t)rela)
return -2;
/* Perform relocations */
for (i = 0; i < dt_relacount; i++, rela++) {
uint64_t *t;
if (ELF64_R_TYPE(rela->r_info) != R_PPC64_RELATIVE)
return -3;
t = (uint64_t *)(rela->r_offset + offset);
*t = rela->r_addend + offset;
}
return 0;
}
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