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 if (gd->flags & GD_FLG_SKIP_RELOC) 21 return 0; 22 23 memcpy((void *)gd->relocaddr, (void *)&__image_copy_start, len); 24 25 return 0; 26 } 27 28 int clear_bss(void) 29 { 30 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off; 31 size_t len = (size_t)&__bss_end - (size_t)&__bss_start; 32 33 memset((void *)dst_addr, 0x00, len); 34 35 return 0; 36 } 37 38 /* 39 * Base functionality is taken from x86 version with added ARC-specifics 40 */ 41 int do_elf_reloc_fixups(void) 42 { 43 Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start); 44 Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end); 45 46 if (gd->flags & GD_FLG_SKIP_RELOC) 47 return 0; 48 49 debug("Section .rela.dyn is located at %08x-%08x\n", 50 (unsigned int)re_src, (unsigned int)re_end); 51 52 Elf32_Addr *offset_ptr_rom, *last_offset = NULL; 53 Elf32_Addr *offset_ptr_ram; 54 55 do { 56 /* Get the location from the relocation entry */ 57 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset; 58 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) { 62 unsigned int val; 63 /* Switch to the in-RAM version */ 64 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom + 65 gd->reloc_off); 66 67 debug("Patching value @ %08x (relocated to %08x)\n", 68 (unsigned int)offset_ptr_rom, 69 (unsigned int)offset_ptr_ram); 70 71 /* 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 76 */ 77 memcpy(&val, offset_ptr_ram, sizeof(int)); 78 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); 84 #endif 85 86 /* Check that the target points into executable */ 87 if (val >= (unsigned int)&__image_copy_start && val <= 88 (unsigned int)&__image_copy_end) { 89 val += gd->reloc_off; 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); 95 #endif 96 memcpy(offset_ptr_ram, &val, sizeof(int)); 97 } 98 } 99 last_offset = offset_ptr_rom; 100 101 } while (++re_src < re_end); 102 103 return 0; 104 } 105