1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
8 #include <asm-generic/sections.h>
10 extern ulong __image_copy_start;
11 extern ulong __ivt_end;
13 DECLARE_GLOBAL_DATA_PTR;
15 int copy_uboot_to_ram(void)
17 size_t len = (size_t)&__image_copy_end - (size_t)&__image_copy_start;
19 if (gd->flags & GD_FLG_SKIP_RELOC)
22 memcpy((void *)gd->relocaddr, (void *)&__image_copy_start, len);
29 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
30 size_t len = (size_t)&__bss_end - (size_t)&__bss_start;
32 memset((void *)dst_addr, 0x00, len);
38 * Base functionality is taken from x86 version with added ARC-specifics
40 int do_elf_reloc_fixups(void)
42 Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start);
43 Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end);
45 if (gd->flags & GD_FLG_SKIP_RELOC)
48 debug("Section .rela.dyn is located at %08x-%08x\n",
49 (unsigned int)re_src, (unsigned int)re_end);
51 Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
52 Elf32_Addr *offset_ptr_ram;
55 /* Get the location from the relocation entry */
56 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;
58 /* Check that the location of the relocation is in .text */
59 if (offset_ptr_rom >= (Elf32_Addr *)&__image_copy_start &&
60 offset_ptr_rom > last_offset) {
62 /* Switch to the in-RAM version */
63 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
66 debug("Patching value @ %08x (relocated to %08x)\n",
67 (unsigned int)offset_ptr_rom,
68 (unsigned int)offset_ptr_ram);
71 * Use "memcpy" because target location might be
72 * 16-bit aligned on ARC so we may need to read
73 * byte-by-byte. On attempt to read entire word by
74 * CPU throws an exception
76 memcpy(&val, offset_ptr_ram, sizeof(int));
78 #ifdef __LITTLE_ENDIAN__
79 /* If location in ".text" section swap value */
80 if ((unsigned int)offset_ptr_rom <
81 (unsigned int)&__ivt_end)
82 val = (val << 16) | (val >> 16);
85 /* Check that the target points into executable */
86 if (val >= (unsigned int)&__image_copy_start && val <=
87 (unsigned int)&__image_copy_end) {
89 #ifdef __LITTLE_ENDIAN__
90 /* If location in ".text" section swap value */
91 if ((unsigned int)offset_ptr_rom <
92 (unsigned int)&__ivt_end)
93 val = (val << 16) | (val >> 16);
95 memcpy(offset_ptr_ram, &val, sizeof(int));
98 last_offset = offset_ptr_rom;
100 } while (++re_src < re_end);