1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. 4 */ 5 6 #include <common.h> 7 #include <elf.h> 8 #include <asm-generic/sections.h> 9 10 extern ulong __image_copy_start; 11 extern ulong __ivt_end; 12 13 DECLARE_GLOBAL_DATA_PTR; 14 15 int copy_uboot_to_ram(void) 16 { 17 size_t len = (size_t)&__image_copy_end - (size_t)&__image_copy_start; 18 19 if (gd->flags & GD_FLG_SKIP_RELOC) 20 return 0; 21 22 memcpy((void *)gd->relocaddr, (void *)&__image_copy_start, len); 23 24 return 0; 25 } 26 27 int clear_bss(void) 28 { 29 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off; 30 size_t len = (size_t)&__bss_end - (size_t)&__bss_start; 31 32 memset((void *)dst_addr, 0x00, len); 33 34 return 0; 35 } 36 37 /* 38 * Base functionality is taken from x86 version with added ARC-specifics 39 */ 40 int do_elf_reloc_fixups(void) 41 { 42 Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start); 43 Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end); 44 45 if (gd->flags & GD_FLG_SKIP_RELOC) 46 return 0; 47 48 debug("Section .rela.dyn is located at %08x-%08x\n", 49 (unsigned int)re_src, (unsigned int)re_end); 50 51 Elf32_Addr *offset_ptr_rom, *last_offset = NULL; 52 Elf32_Addr *offset_ptr_ram; 53 54 do { 55 /* Get the location from the relocation entry */ 56 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset; 57 58 /* Check that the location of the relocation is in .text */ 59 if (offset_ptr_rom >= (Elf32_Addr *)&__image_copy_start && 60 offset_ptr_rom > last_offset) { 61 unsigned int val; 62 /* Switch to the in-RAM version */ 63 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom + 64 gd->reloc_off); 65 66 debug("Patching value @ %08x (relocated to %08x)\n", 67 (unsigned int)offset_ptr_rom, 68 (unsigned int)offset_ptr_ram); 69 70 /* 71 * Use "memcpy" because target location might be 72 * 16-bit aligned on ARC so we may need to read 73 * byte-by-byte. On attempt to read entire word by 74 * CPU throws an exception 75 */ 76 memcpy(&val, offset_ptr_ram, sizeof(int)); 77 78 #ifdef __LITTLE_ENDIAN__ 79 /* If location in ".text" section swap value */ 80 if ((unsigned int)offset_ptr_rom < 81 (unsigned int)&__ivt_end) 82 val = (val << 16) | (val >> 16); 83 #endif 84 85 /* Check that the target points into executable */ 86 if (val >= (unsigned int)&__image_copy_start && val <= 87 (unsigned int)&__image_copy_end) { 88 val += gd->reloc_off; 89 #ifdef __LITTLE_ENDIAN__ 90 /* If location in ".text" section swap value */ 91 if ((unsigned int)offset_ptr_rom < 92 (unsigned int)&__ivt_end) 93 val = (val << 16) | (val >> 16); 94 #endif 95 memcpy(offset_ptr_ram, &val, sizeof(int)); 96 } 97 } 98 last_offset = offset_ptr_rom; 99 100 } while (++re_src < re_end); 101 102 return 0; 103 } 104