mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-14 23:26:16 +09:00
ffffcd1594
This might be useful to make sure relocation fixups really happen. And since this info gets printed only in DEBUG build it doesn't really hurt normal execution. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <elf.h>
|
|
#include <asm/sections.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
int copy_uboot_to_ram(void)
|
|
{
|
|
size_t len = (size_t)&__image_copy_end - (size_t)&__image_copy_start;
|
|
|
|
memcpy((void *)gd->relocaddr, (void *)&__image_copy_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;
|
|
|
|
memset((void *)dst_addr, 0x00, len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Base functionality is taken from x86 version with added ARC-specifics
|
|
*/
|
|
int do_elf_reloc_fixups(void)
|
|
{
|
|
Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start);
|
|
Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end);
|
|
|
|
debug("Section .rela.dyn is located at %08x-%08x\n",
|
|
(unsigned int)re_src, (unsigned int)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 *)re_src->r_offset;
|
|
|
|
/* Check that the location of the relocation is in .text */
|
|
if (offset_ptr_rom >= (Elf32_Addr *)&__image_copy_start &&
|
|
offset_ptr_rom > last_offset) {
|
|
unsigned int val;
|
|
/* Switch to the in-RAM version */
|
|
offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
|
|
gd->reloc_off);
|
|
|
|
debug("Patching value @ %08x (relocated to %08x)\n",
|
|
(unsigned int)offset_ptr_rom,
|
|
(unsigned int)offset_ptr_ram);
|
|
|
|
/*
|
|
* Use "memcpy" because target location might be
|
|
* 16-bit aligned on ARC so we may need to read
|
|
* byte-by-byte. On attempt to read entire word by
|
|
* CPU throws an exception
|
|
*/
|
|
memcpy(&val, offset_ptr_ram, sizeof(int));
|
|
|
|
#ifdef __LITTLE_ENDIAN__
|
|
/* If location in ".text" section swap value */
|
|
if ((unsigned int)offset_ptr_rom <
|
|
(unsigned int)&__ivt_end)
|
|
val = (val << 16) | (val >> 16);
|
|
#endif
|
|
|
|
/* Check that the target points into executable */
|
|
if (val >= (unsigned int)&__image_copy_start && val <=
|
|
(unsigned int)&__image_copy_end) {
|
|
val += gd->reloc_off;
|
|
#ifdef __LITTLE_ENDIAN__
|
|
/* If location in ".text" section swap value */
|
|
if ((unsigned int)offset_ptr_rom <
|
|
(unsigned int)&__ivt_end)
|
|
val = (val << 16) | (val >> 16);
|
|
#endif
|
|
memcpy(offset_ptr_ram, &val, sizeof(int));
|
|
}
|
|
}
|
|
last_offset = offset_ptr_rom;
|
|
|
|
} while (++re_src < re_end);
|
|
|
|
return 0;
|
|
}
|