136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <elf.h>
|
|
#include <asm-generic/sections.h>
|
|
|
|
extern ulong __image_copy_start;
|
|
extern ulong __ivt_start;
|
|
extern ulong __ivt_end;
|
|
extern ulong __text_end;
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
int copy_uboot_to_ram(void)
|
|
{
|
|
size_t len = (size_t)&__image_copy_end - (size_t)&__image_copy_start;
|
|
|
|
if (gd->flags & GD_FLG_SKIP_RELOC)
|
|
return 0;
|
|
|
|
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);
|
|
|
|
if (gd->flags & GD_FLG_SKIP_RELOC)
|
|
return 0;
|
|
|
|
debug("Section .rela.dyn is located at %08x-%08x\n",
|
|
(unsigned int)re_src, (unsigned int)re_end);
|
|
|
|
Elf32_Addr *offset_ptr_rom;
|
|
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 < (Elf32_Addr *)&__image_copy_end) {
|
|
unsigned int val, do_swap = 0;
|
|
/* Switch to the in-RAM version */
|
|
offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
|
|
gd->reloc_off);
|
|
|
|
#ifdef __LITTLE_ENDIAN__
|
|
/* If location in ".text" section swap value */
|
|
if (((u32)offset_ptr_rom >= (u32)&__text_start &&
|
|
(u32)offset_ptr_rom <= (u32)&__text_end)
|
|
#if defined(__ARC700__) || defined(__ARC600__)
|
|
|| ((u32)offset_ptr_rom >= (u32)&__ivt_start &&
|
|
(u32)offset_ptr_rom <= (u32)&__ivt_end)
|
|
#endif
|
|
)
|
|
do_swap = 1;
|
|
#endif
|
|
|
|
debug("Patching value @ %08x (relocated to %08x)%s\n",
|
|
(unsigned int)offset_ptr_rom,
|
|
(unsigned int)offset_ptr_ram,
|
|
do_swap ? ", middle-endian encoded" : "");
|
|
|
|
/*
|
|
* 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));
|
|
|
|
if (do_swap)
|
|
val = (val << 16) | (val >> 16);
|
|
|
|
/* Check that the target points into executable */
|
|
if (val < (unsigned int)&__image_copy_start ||
|
|
val > (unsigned int)&__image_copy_end) {
|
|
/* TODO: Use panic() instead of debug()
|
|
*
|
|
* For some reason GCC might generate
|
|
* fake relocation even for LD/SC of constant
|
|
* inderectly. See an example below:
|
|
* ----------------------->8--------------------
|
|
* static int setup_mon_len(void)
|
|
* {
|
|
* gd->mon_len = (ulong)&__bss_end - CONFIG_SYS_MONITOR_BASE;
|
|
* return 0;
|
|
* }
|
|
* ----------------------->8--------------------
|
|
*
|
|
* And that's what we get in the binary:
|
|
* ----------------------->8--------------------
|
|
* 10005cb4 <setup_mon_len>:
|
|
* 10005cb4: 193c 3f80 0003 2f80 st 0x32f80,[r25,60]
|
|
* 10005cb8: R_ARC_RELATIVE *ABS*-0x10000000
|
|
* 10005cbc: 7fe0 j_s.d [blink]
|
|
* 10005cbe: 700c mov_s r0,0
|
|
* ----------------------->8--------------------
|
|
*/
|
|
debug("Relocation target %08x points outside of image\n",
|
|
val);
|
|
}
|
|
|
|
val += gd->reloc_off;
|
|
|
|
if (do_swap)
|
|
val = (val << 16) | (val >> 16);
|
|
|
|
memcpy(offset_ptr_ram, &val, sizeof(int));
|
|
}
|
|
} while (++re_src < re_end);
|
|
|
|
return 0;
|
|
}
|