| Alexey Brodkin | 2272382 | 2014-02-04 12:56:15 +0400 | [diff] [blame] | 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 *)CONFIG_SYS_TEXT_BASE && |
| 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 | /* If location in ".text" section swap value */ |
| 45 | if ((unsigned int)offset_ptr_rom < |
| 46 | (unsigned int)&__text_end) |
| 47 | val = (val << 16) | (val >> 16); |
| 48 | |
| 49 | /* Check that the target points into .text */ |
| 50 | if (val >= CONFIG_SYS_TEXT_BASE && val <= |
| 51 | (unsigned int)&__bss_end) { |
| 52 | val += gd->reloc_off; |
| 53 | /* If location in ".text" section swap value */ |
| 54 | if ((unsigned int)offset_ptr_rom < |
| 55 | (unsigned int)&__text_end) |
| 56 | val = (val << 16) | (val >> 16); |
| 57 | memcpy(offset_ptr_ram, &val, sizeof(int)); |
| 58 | } else { |
| 59 | debug(" %p: rom reloc %x, ram %p, value %x, limit %x\n", |
| 60 | re_src, re_src->r_offset, offset_ptr_ram, |
| 61 | val, (unsigned int)&__bss_end); |
| 62 | } |
| 63 | } else { |
| 64 | debug(" %p: rom reloc %x, last %p\n", re_src, |
| 65 | re_src->r_offset, last_offset); |
| 66 | } |
| 67 | last_offset = offset_ptr_rom; |
| 68 | |
| 69 | } while (++re_src < re_end); |
| 70 | |
| 71 | return 0; |
| 72 | } |