2 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
4 * SPDX-License-Identifier: GPL-2.0+
9 #include <asm-generic/sections.h>
11 extern ulong __image_copy_start;
12 extern ulong __ivt_end;
14 DECLARE_GLOBAL_DATA_PTR;
16 int copy_uboot_to_ram(void)
18 size_t len = (size_t)&__image_copy_end - (size_t)&__image_copy_start;
20 if (gd->flags & GD_FLG_SKIP_RELOC)
23 memcpy((void *)gd->relocaddr, (void *)&__image_copy_start, len);
30 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
31 size_t len = (size_t)&__bss_end - (size_t)&__bss_start;
33 memset((void *)dst_addr, 0x00, len);
39 * Base functionality is taken from x86 version with added ARC-specifics
41 int do_elf_reloc_fixups(void)
43 Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start);
44 Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end);
46 if (gd->flags & GD_FLG_SKIP_RELOC)
49 debug("Section .rela.dyn is located at %08x-%08x\n",
50 (unsigned int)re_src, (unsigned int)re_end);
52 Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
53 Elf32_Addr *offset_ptr_ram;
56 /* Get the location from the relocation entry */
57 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;
59 /* Check that the location of the relocation is in .text */
60 if (offset_ptr_rom >= (Elf32_Addr *)&__image_copy_start &&
61 offset_ptr_rom > last_offset) {
63 /* Switch to the in-RAM version */
64 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
67 debug("Patching value @ %08x (relocated to %08x)\n",
68 (unsigned int)offset_ptr_rom,
69 (unsigned int)offset_ptr_ram);
72 * Use "memcpy" because target location might be
73 * 16-bit aligned on ARC so we may need to read
74 * byte-by-byte. On attempt to read entire word by
75 * CPU throws an exception
77 memcpy(&val, offset_ptr_ram, sizeof(int));
79 #ifdef __LITTLE_ENDIAN__
80 /* If location in ".text" section swap value */
81 if ((unsigned int)offset_ptr_rom <
82 (unsigned int)&__ivt_end)
83 val = (val << 16) | (val >> 16);
86 /* Check that the target points into executable */
87 if (val >= (unsigned int)&__image_copy_start && val <=
88 (unsigned int)&__image_copy_end) {
90 #ifdef __LITTLE_ENDIAN__
91 /* If location in ".text" section swap value */
92 if ((unsigned int)offset_ptr_rom <
93 (unsigned int)&__ivt_end)
94 val = (val << 16) | (val >> 16);
96 memcpy(offset_ptr_ram, &val, sizeof(int));
99 last_offset = offset_ptr_rom;
101 } while (++re_src < re_end);