arc: No need in sections defined in sources with newer tools
[people/ms/u-boot.git] / arch / arc / lib / relocate.c
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         memcpy((void *)gd->relocaddr, (void *)&__image_copy_start, len);
21
22         return 0;
23 }
24
25 int clear_bss(void)
26 {
27         ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
28         size_t len = (size_t)&__bss_end - (size_t)&__bss_start;
29
30         memset((void *)dst_addr, 0x00, len);
31
32         return 0;
33 }
34
35 /*
36  * Base functionality is taken from x86 version with added ARC-specifics
37  */
38 int do_elf_reloc_fixups(void)
39 {
40         Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start);
41         Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end);
42
43         debug("Section .rela.dyn is located at %08x-%08x\n",
44               (unsigned int)re_src, (unsigned int)re_end);
45
46         Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
47         Elf32_Addr *offset_ptr_ram;
48
49         do {
50                 /* Get the location from the relocation entry */
51                 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;
52
53                 /* Check that the location of the relocation is in .text */
54                 if (offset_ptr_rom >= (Elf32_Addr *)&__image_copy_start &&
55                     offset_ptr_rom > last_offset) {
56                         unsigned int val;
57                         /* Switch to the in-RAM version */
58                         offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
59                                                         gd->reloc_off);
60
61                         debug("Patching value @ %08x (relocated to %08x)\n",
62                               (unsigned int)offset_ptr_rom,
63                               (unsigned int)offset_ptr_ram);
64
65                         /*
66                          * Use "memcpy" because target location might be
67                          * 16-bit aligned on ARC so we may need to read
68                          * byte-by-byte. On attempt to read entire word by
69                          * CPU throws an exception
70                          */
71                         memcpy(&val, offset_ptr_ram, sizeof(int));
72
73 #ifdef __LITTLE_ENDIAN__
74                         /* If location in ".text" section swap value */
75                         if ((unsigned int)offset_ptr_rom <
76                             (unsigned int)&__ivt_end)
77                                 val = (val << 16) | (val >> 16);
78 #endif
79
80                         /* Check that the target points into executable */
81                         if (val >= (unsigned int)&__image_copy_start && val <=
82                             (unsigned int)&__image_copy_end) {
83                                 val += gd->reloc_off;
84 #ifdef __LITTLE_ENDIAN__
85                                 /* If location in ".text" section swap value */
86                                 if ((unsigned int)offset_ptr_rom <
87                                     (unsigned int)&__ivt_end)
88                                         val = (val << 16) | (val >> 16);
89 #endif
90                                 memcpy(offset_ptr_ram, &val, sizeof(int));
91                         }
92                 }
93                 last_offset = offset_ptr_rom;
94
95         } while (++re_src < re_end);
96
97         return 0;
98 }