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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 = (size_t)&__data_end - (size_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 = (size_t)&__bss_end - (size_t)&__bss_start;
if (gd->flags & GD_FLG_SKIP_RELOC)
return 0;
memset((void *)dst_addr, 0x00, len);
return 0;
}
/*
* This function has more error checking than you might expect. Please see
* the commit message for more informaiton.
*/
int do_elf_reloc_fixups(void)
{
Elf32_Rel *re_src = (Elf32_Rel *)(&__rel_dyn_start);
Elf32_Rel *re_end = (Elf32_Rel *)(&__rel_dyn_end);
Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
Elf32_Addr *offset_ptr_ram;
unsigned int text_base = 0;
/* 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
do {
/* Get the location from the relocation entry */
offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;
/* Check that the location of the relocation is in .text */
if (offset_ptr_rom >= (Elf32_Addr *)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);
return 0;
}
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