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