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 debug("Section .rela.dyn is located at %08x-%08x\n", 41 (unsigned int)re_src, (unsigned int)re_end); 42 43 Elf32_Addr *offset_ptr_rom, *last_offset = NULL; 44 Elf32_Addr *offset_ptr_ram; 45 46 do { 47 /* Get the location from the relocation entry */ 48 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset; 49 50 /* Check that the location of the relocation is in .text */ 51 if (offset_ptr_rom >= (Elf32_Addr *)&__image_copy_start && 52 offset_ptr_rom > last_offset) { 53 unsigned int val; 54 /* Switch to the in-RAM version */ 55 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom + 56 gd->reloc_off); 57 58 debug("Patching value @ %08x (relocated to %08x)\n", 59 (unsigned int)offset_ptr_rom, 60 (unsigned int)offset_ptr_ram); 61 62 /* 63 * Use "memcpy" because target location might be 64 * 16-bit aligned on ARC so we may need to read 65 * byte-by-byte. On attempt to read entire word by 66 * CPU throws an exception 67 */ 68 memcpy(&val, offset_ptr_ram, sizeof(int)); 69 70 #ifdef __LITTLE_ENDIAN__ 71 /* If location in ".text" section swap value */ 72 if ((unsigned int)offset_ptr_rom < 73 (unsigned int)&__ivt_end) 74 val = (val << 16) | (val >> 16); 75 #endif 76 77 /* Check that the target points into executable */ 78 if (val >= (unsigned int)&__image_copy_start && val <= 79 (unsigned int)&__image_copy_end) { 80 val += gd->reloc_off; 81 #ifdef __LITTLE_ENDIAN__ 82 /* If location in ".text" section swap value */ 83 if ((unsigned int)offset_ptr_rom < 84 (unsigned int)&__ivt_end) 85 val = (val << 16) | (val >> 16); 86 #endif 87 memcpy(offset_ptr_ram, &val, sizeof(int)); 88 } 89 } 90 last_offset = offset_ptr_rom; 91 92 } while (++re_src < re_end); 93 94 return 0; 95 } 96