1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <common.h>
8*4882a593Smuzhiyun #include <elf.h>
9*4882a593Smuzhiyun #include <asm-generic/sections.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun extern ulong __image_copy_start;
12*4882a593Smuzhiyun extern ulong __ivt_end;
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun DECLARE_GLOBAL_DATA_PTR;
15*4882a593Smuzhiyun
copy_uboot_to_ram(void)16*4882a593Smuzhiyun int copy_uboot_to_ram(void)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun size_t len = (size_t)&__image_copy_end - (size_t)&__image_copy_start;
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun memcpy((void *)gd->relocaddr, (void *)&__image_copy_start, len);
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun return 0;
23*4882a593Smuzhiyun }
24*4882a593Smuzhiyun
clear_bss(void)25*4882a593Smuzhiyun int clear_bss(void)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
28*4882a593Smuzhiyun size_t len = (size_t)&__bss_end - (size_t)&__bss_start;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun memset((void *)dst_addr, 0x00, len);
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun return 0;
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun /*
36*4882a593Smuzhiyun * Base functionality is taken from x86 version with added ARC-specifics
37*4882a593Smuzhiyun */
do_elf_reloc_fixups(void)38*4882a593Smuzhiyun int do_elf_reloc_fixups(void)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start);
41*4882a593Smuzhiyun Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end);
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun debug("Section .rela.dyn is located at %08x-%08x\n",
44*4882a593Smuzhiyun (unsigned int)re_src, (unsigned int)re_end);
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
47*4882a593Smuzhiyun Elf32_Addr *offset_ptr_ram;
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun do {
50*4882a593Smuzhiyun /* Get the location from the relocation entry */
51*4882a593Smuzhiyun offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun /* Check that the location of the relocation is in .text */
54*4882a593Smuzhiyun if (offset_ptr_rom >= (Elf32_Addr *)&__image_copy_start &&
55*4882a593Smuzhiyun offset_ptr_rom > last_offset) {
56*4882a593Smuzhiyun unsigned int val;
57*4882a593Smuzhiyun /* Switch to the in-RAM version */
58*4882a593Smuzhiyun offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
59*4882a593Smuzhiyun gd->reloc_off);
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun debug("Patching value @ %08x (relocated to %08x)\n",
62*4882a593Smuzhiyun (unsigned int)offset_ptr_rom,
63*4882a593Smuzhiyun (unsigned int)offset_ptr_ram);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun /*
66*4882a593Smuzhiyun * Use "memcpy" because target location might be
67*4882a593Smuzhiyun * 16-bit aligned on ARC so we may need to read
68*4882a593Smuzhiyun * byte-by-byte. On attempt to read entire word by
69*4882a593Smuzhiyun * CPU throws an exception
70*4882a593Smuzhiyun */
71*4882a593Smuzhiyun memcpy(&val, offset_ptr_ram, sizeof(int));
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun #ifdef __LITTLE_ENDIAN__
74*4882a593Smuzhiyun /* If location in ".text" section swap value */
75*4882a593Smuzhiyun if ((unsigned int)offset_ptr_rom <
76*4882a593Smuzhiyun (unsigned int)&__ivt_end)
77*4882a593Smuzhiyun val = (val << 16) | (val >> 16);
78*4882a593Smuzhiyun #endif
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun /* Check that the target points into executable */
81*4882a593Smuzhiyun if (val >= (unsigned int)&__image_copy_start && val <=
82*4882a593Smuzhiyun (unsigned int)&__image_copy_end) {
83*4882a593Smuzhiyun val += gd->reloc_off;
84*4882a593Smuzhiyun #ifdef __LITTLE_ENDIAN__
85*4882a593Smuzhiyun /* If location in ".text" section swap value */
86*4882a593Smuzhiyun if ((unsigned int)offset_ptr_rom <
87*4882a593Smuzhiyun (unsigned int)&__ivt_end)
88*4882a593Smuzhiyun val = (val << 16) | (val >> 16);
89*4882a593Smuzhiyun #endif
90*4882a593Smuzhiyun memcpy(offset_ptr_ram, &val, sizeof(int));
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun last_offset = offset_ptr_rom;
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun } while (++re_src < re_end);
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun return 0;
98*4882a593Smuzhiyun }
99