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/*
* (C) Copyright 2008-2011
* Graeme Russ, <graeme.russ@gmail.com>
*
* (C) Copyright 2002
* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
*
* (C) Copyright 2002
* Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <inttypes.h>
#include <asm/u-boot-x86.h>
#include <asm/relocate.h>
#include <asm/sections.h>
#include <elf.h>
DECLARE_GLOBAL_DATA_PTR;
int copy_uboot_to_ram(void)
{
size_t len = (uintptr_t)&__data_end - (uintptr_t)&__text_start;
if (gd->flags & GD_FLG_SKIP_RELOC)
return 0;
memcpy((void *)gd->relocaddr, (void *)&__text_start, len);
return 0;
}
int clear_bss(void)
{
ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
size_t len = (uintptr_t)&__bss_end - (uintptr_t)&__bss_start;
if (gd->flags & GD_FLG_SKIP_RELOC)
return 0;
memset((void *)dst_addr, 0x00, len);
return 0;
}
#if CONFIG_IS_ENABLED(X86_64)
static void do_elf_reloc_fixups64(unsigned int text_base, uintptr_t size,
Elf64_Rela *re_src, Elf64_Rela *re_end)
{
Elf64_Addr *offset_ptr_rom, *last_offset = NULL;
Elf64_Addr *offset_ptr_ram;
do {
/* Get the location from the relocation entry */
offset_ptr_rom = (Elf64_Addr *)(uintptr_t)re_src->r_offset;
/* Check that the location of the relocation is in .text */
if (offset_ptr_rom >= (Elf64_Addr *)(uintptr_t)text_base &&
offset_ptr_rom > last_offset) {
/* Switch to the in-RAM version */
offset_ptr_ram = (Elf64_Addr *)((ulong)offset_ptr_rom +
gd->reloc_off);
/* Check that the target points into .text */
if (*offset_ptr_ram >= text_base &&
*offset_ptr_ram <= text_base + size) {
*offset_ptr_ram = gd->reloc_off +
re_src->r_addend;
} else {
debug(" %p: %lx: rom reloc %lx, ram %p, value %lx, limit %"
PRIXPTR "\n",
re_src, (ulong)re_src->r_info,
(ulong)re_src->r_offset, offset_ptr_ram,
(ulong)*offset_ptr_ram, text_base + size);
}
} else {
debug(" %p: %lx: rom reloc %lx, last %p\n", re_src,
(ulong)re_src->r_info, (ulong)re_src->r_offset,
last_offset);
}
last_offset = offset_ptr_rom;
} while (++re_src < re_end);
}
#else
static void do_elf_reloc_fixups32(unsigned int text_base, uintptr_t size,
Elf32_Rel *re_src, Elf32_Rel *re_end)
{
Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
Elf32_Addr *offset_ptr_ram;
do {
/* Get the location from the relocation entry */
offset_ptr_rom = (Elf32_Addr *)(uintptr_t)re_src->r_offset;
/* Check that the location of the relocation is in .text */
if (offset_ptr_rom >= (Elf32_Addr *)(uintptr_t)text_base &&
offset_ptr_rom > last_offset) {
/* Switch to the in-RAM version */
offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
gd->reloc_off);
/* Check that the target points into .text */
if (*offset_ptr_ram >= text_base &&
*offset_ptr_ram <= text_base + size) {
*offset_ptr_ram += gd->reloc_off;
} else {
debug(" %p: rom reloc %x, ram %p, value %x,"
" limit %" PRIXPTR "\n", re_src,
re_src->r_offset, offset_ptr_ram,
*offset_ptr_ram,
text_base + size);
}
} else {
debug(" %p: rom reloc %x, last %p\n", re_src,
re_src->r_offset, last_offset);
}
last_offset = offset_ptr_rom;
} while (++re_src < re_end);
}
#endif
/*
* This function has more error checking than you might expect. Please see
* this commit message for more information:
* 62f7970a x86: Add error checking to x86 relocation code
*/
int do_elf_reloc_fixups(void)
{
void *re_src = (void *)(&__rel_dyn_start);
void *re_end = (void *)(&__rel_dyn_end);
uint text_base;
/* The size of the region of u-boot that runs out of RAM. */
uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start;
if (gd->flags & GD_FLG_SKIP_RELOC)
return 0;
if (re_src == re_end)
panic("No relocation data");
#ifdef CONFIG_SYS_TEXT_BASE
text_base = CONFIG_SYS_TEXT_BASE;
#else
panic("No CONFIG_SYS_TEXT_BASE");
#endif
#if CONFIG_IS_ENABLED(X86_64)
do_elf_reloc_fixups64(text_base, size, re_src, re_end);
#else
do_elf_reloc_fixups32(text_base, size, re_src, re_end);
#endif
return 0;
}
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