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/sections.h> 10 11 DECLARE_GLOBAL_DATA_PTR; 12 13 int copy_uboot_to_ram(void) 14 { 15 size_t len = (size_t)&__image_copy_end - (size_t)&__image_copy_start; 16 17 memcpy((void *)gd->relocaddr, (void *)&__image_copy_start, len); 18 19 return 0; 20 } 21 22 int clear_bss(void) 23 { 24 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off; 25 size_t len = (size_t)&__bss_end - (size_t)&__bss_start; 26 27 memset((void *)dst_addr, 0x00, len); 28 29 return 0; 30 } 31 32 /* 33 * Base functionality is taken from x86 version with added ARC-specifics 34 */ 35 int do_elf_reloc_fixups(void) 36 { 37 Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start); 38 Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end); 39 40 Elf32_Addr *offset_ptr_rom, *last_offset = NULL; 41 Elf32_Addr *offset_ptr_ram; 42 43 do { 44 /* Get the location from the relocation entry */ 45 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset; 46 47 /* Check that the location of the relocation is in .text */ 48 if (offset_ptr_rom >= (Elf32_Addr *)&__image_copy_start && 49 offset_ptr_rom > last_offset) { 50 unsigned int val; 51 /* Switch to the in-RAM version */ 52 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom + 53 gd->reloc_off); 54 55 /* 56 * Use "memcpy" because target location might be 57 * 16-bit aligned on ARC so we may need to read 58 * byte-by-byte. On attempt to read entire word by 59 * CPU throws an exception 60 */ 61 memcpy(&val, offset_ptr_ram, sizeof(int)); 62 63 #ifdef __LITTLE_ENDIAN__ 64 /* If location in ".text" section swap value */ 65 if ((unsigned int)offset_ptr_rom < 66 (unsigned int)&__ivt_end) 67 val = (val << 16) | (val >> 16); 68 #endif 69 70 /* Check that the target points into executable */ 71 if (val >= (unsigned int)&__image_copy_start && val <= 72 (unsigned int)&__image_copy_end) { 73 val += gd->reloc_off; 74 #ifdef __LITTLE_ENDIAN__ 75 /* If location in ".text" section swap value */ 76 if ((unsigned int)offset_ptr_rom < 77 (unsigned int)&__ivt_end) 78 val = (val << 16) | (val >> 16); 79 #endif 80 memcpy(offset_ptr_ram, &val, sizeof(int)); 81 } 82 } 83 last_offset = offset_ptr_rom; 84 85 } while (++re_src < re_end); 86 87 return 0; 88 } 89