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1/* Kernel module help for SH.
2
3 SHcompact version by Kaz Kojima and Paul Mundt.
4
5 SHmedia bits:
6
7 Copyright 2004 SuperH (UK) Ltd
8 Author: Richard Curnow
9
10 Based on the sh version, and on code from the sh64-specific parts of
11 modutils, originally written by Richard Curnow and Ben Gaster.
12
13 This program is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2 of the License, or
16 (at your option) any later version.
17
18 This program is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
22
23 You should have received a copy of the GNU General Public License
24 along with this program; if not, write to the Free Software
25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26*/
27#include <linux/moduleloader.h>
28#include <linux/elf.h>
29#include <linux/vmalloc.h>
30#include <linux/bug.h>
31#include <linux/fs.h>
32#include <linux/string.h>
33#include <linux/kernel.h>
34#include <asm/unaligned.h>
35#include <asm/dwarf.h>
36
37int apply_relocate_add(Elf32_Shdr *sechdrs,
38 const char *strtab,
39 unsigned int symindex,
40 unsigned int relsec,
41 struct module *me)
42{
43 unsigned int i;
44 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
45 Elf32_Sym *sym;
46 Elf32_Addr relocation;
47 uint32_t *location;
48 uint32_t value;
49
50 pr_debug("Applying relocate section %u to %u\n", relsec,
51 sechdrs[relsec].sh_info);
52 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
53 /* This is where to make the change */
54 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
55 + rel[i].r_offset;
56 /* This is the symbol it is referring to. Note that all
57 undefined symbols have been resolved. */
58 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
59 + ELF32_R_SYM(rel[i].r_info);
60 relocation = sym->st_value + rel[i].r_addend;
61
62#ifdef CONFIG_SUPERH64
63 /* For text addresses, bit2 of the st_other field indicates
64 * whether the symbol is SHmedia (1) or SHcompact (0). If
65 * SHmedia, the LSB of the symbol needs to be asserted
66 * for the CPU to be in SHmedia mode when it starts executing
67 * the branch target. */
68 relocation |= !!(sym->st_other & 4);
69#endif
70
71 switch (ELF32_R_TYPE(rel[i].r_info)) {
72 case R_SH_NONE:
73 break;
74 case R_SH_DIR32:
75 value = get_unaligned(location);
76 value += relocation;
77 put_unaligned(value, location);
78 break;
79 case R_SH_REL32:
80 relocation = (relocation - (Elf32_Addr) location);
81 value = get_unaligned(location);
82 value += relocation;
83 put_unaligned(value, location);
84 break;
85 case R_SH_IMM_LOW16:
86 *location = (*location & ~0x3fffc00) |
87 ((relocation & 0xffff) << 10);
88 break;
89 case R_SH_IMM_MEDLOW16:
90 *location = (*location & ~0x3fffc00) |
91 (((relocation >> 16) & 0xffff) << 10);
92 break;
93 case R_SH_IMM_LOW16_PCREL:
94 relocation -= (Elf32_Addr) location;
95 *location = (*location & ~0x3fffc00) |
96 ((relocation & 0xffff) << 10);
97 break;
98 case R_SH_IMM_MEDLOW16_PCREL:
99 relocation -= (Elf32_Addr) location;
100 *location = (*location & ~0x3fffc00) |
101 (((relocation >> 16) & 0xffff) << 10);
102 break;
103 default:
104 printk(KERN_ERR "module %s: Unknown relocation: %u\n",
105 me->name, ELF32_R_TYPE(rel[i].r_info));
106 return -ENOEXEC;
107 }
108 }
109 return 0;
110}
111
112int module_finalize(const Elf_Ehdr *hdr,
113 const Elf_Shdr *sechdrs,
114 struct module *me)
115{
116 int ret = 0;
117
118 ret |= module_dwarf_finalize(hdr, sechdrs, me);
119
120 return ret;
121}
122
123void module_arch_cleanup(struct module *mod)
124{
125 module_dwarf_cleanup(mod);
126}
1/* Kernel module help for SH.
2
3 SHcompact version by Kaz Kojima and Paul Mundt.
4
5 SHmedia bits:
6
7 Copyright 2004 SuperH (UK) Ltd
8 Author: Richard Curnow
9
10 Based on the sh version, and on code from the sh64-specific parts of
11 modutils, originally written by Richard Curnow and Ben Gaster.
12
13 This program is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2 of the License, or
16 (at your option) any later version.
17
18 This program is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
22
23 You should have received a copy of the GNU General Public License
24 along with this program; if not, write to the Free Software
25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26*/
27#include <linux/moduleloader.h>
28#include <linux/elf.h>
29#include <linux/vmalloc.h>
30#include <linux/bug.h>
31#include <linux/fs.h>
32#include <linux/string.h>
33#include <linux/kernel.h>
34#include <asm/unaligned.h>
35#include <asm/dwarf.h>
36
37int apply_relocate_add(Elf32_Shdr *sechdrs,
38 const char *strtab,
39 unsigned int symindex,
40 unsigned int relsec,
41 struct module *me)
42{
43 unsigned int i;
44 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
45 Elf32_Sym *sym;
46 Elf32_Addr relocation;
47 uint32_t *location;
48 uint32_t value;
49
50 pr_debug("Applying relocate section %u to %u\n", relsec,
51 sechdrs[relsec].sh_info);
52 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
53 /* This is where to make the change */
54 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
55 + rel[i].r_offset;
56 /* This is the symbol it is referring to. Note that all
57 undefined symbols have been resolved. */
58 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
59 + ELF32_R_SYM(rel[i].r_info);
60 relocation = sym->st_value + rel[i].r_addend;
61
62#ifdef CONFIG_SUPERH64
63 /* For text addresses, bit2 of the st_other field indicates
64 * whether the symbol is SHmedia (1) or SHcompact (0). If
65 * SHmedia, the LSB of the symbol needs to be asserted
66 * for the CPU to be in SHmedia mode when it starts executing
67 * the branch target. */
68 relocation |= !!(sym->st_other & 4);
69#endif
70
71 switch (ELF32_R_TYPE(rel[i].r_info)) {
72 case R_SH_NONE:
73 break;
74 case R_SH_DIR32:
75 value = get_unaligned(location);
76 value += relocation;
77 put_unaligned(value, location);
78 break;
79 case R_SH_REL32:
80 relocation = (relocation - (Elf32_Addr) location);
81 value = get_unaligned(location);
82 value += relocation;
83 put_unaligned(value, location);
84 break;
85 case R_SH_IMM_LOW16:
86 *location = (*location & ~0x3fffc00) |
87 ((relocation & 0xffff) << 10);
88 break;
89 case R_SH_IMM_MEDLOW16:
90 *location = (*location & ~0x3fffc00) |
91 (((relocation >> 16) & 0xffff) << 10);
92 break;
93 case R_SH_IMM_LOW16_PCREL:
94 relocation -= (Elf32_Addr) location;
95 *location = (*location & ~0x3fffc00) |
96 ((relocation & 0xffff) << 10);
97 break;
98 case R_SH_IMM_MEDLOW16_PCREL:
99 relocation -= (Elf32_Addr) location;
100 *location = (*location & ~0x3fffc00) |
101 (((relocation >> 16) & 0xffff) << 10);
102 break;
103 default:
104 printk(KERN_ERR "module %s: Unknown relocation: %u\n",
105 me->name, ELF32_R_TYPE(rel[i].r_info));
106 return -ENOEXEC;
107 }
108 }
109 return 0;
110}
111
112int module_finalize(const Elf_Ehdr *hdr,
113 const Elf_Shdr *sechdrs,
114 struct module *me)
115{
116 int ret = 0;
117
118 ret |= module_dwarf_finalize(hdr, sechdrs, me);
119
120 return ret;
121}
122
123void module_arch_cleanup(struct module *mod)
124{
125 module_dwarf_cleanup(mod);
126}