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