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1da177e4 LT |
1 | /* Kernel module help for M32R. |
2 | ||
3 | This program is free software; you can redistribute it and/or modify | |
4 | it under the terms of the GNU General Public License as published by | |
5 | the Free Software Foundation; either version 2 of the License, or | |
6 | (at your option) any later version. | |
7 | ||
8 | This program is distributed in the hope that it will be useful, | |
9 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | GNU General Public License for more details. | |
12 | ||
13 | You should have received a copy of the GNU General Public License | |
14 | along with this program; if not, write to the Free Software | |
15 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/moduleloader.h> |
19 | #include <linux/elf.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/kernel.h> | |
24 | ||
25 | #if 0 | |
26 | #define DEBUGP printk | |
27 | #else | |
28 | #define DEBUGP(fmt...) | |
29 | #endif | |
30 | ||
1da177e4 LT |
31 | #define COPY_UNALIGNED_WORD(sw, tw, align) \ |
32 | { \ | |
33 | void *__s = &(sw), *__t = &(tw); \ | |
34 | unsigned short *__s2 = __s, *__t2 =__t; \ | |
35 | unsigned char *__s1 = __s, *__t1 =__t; \ | |
36 | switch ((align)) \ | |
37 | { \ | |
38 | case 0: \ | |
39 | *(unsigned long *) __t = *(unsigned long *) __s; \ | |
40 | break; \ | |
41 | case 2: \ | |
42 | *__t2++ = *__s2++; \ | |
43 | *__t2 = *__s2; \ | |
44 | break; \ | |
45 | default: \ | |
46 | *__t1++ = *__s1++; \ | |
47 | *__t1++ = *__s1++; \ | |
48 | *__t1++ = *__s1++; \ | |
49 | *__t1 = *__s1; \ | |
50 | break; \ | |
51 | } \ | |
52 | } | |
53 | ||
54 | #define COPY_UNALIGNED_HWORD(sw, tw, align) \ | |
55 | { \ | |
56 | void *__s = &(sw), *__t = &(tw); \ | |
57 | unsigned short *__s2 = __s, *__t2 =__t; \ | |
58 | unsigned char *__s1 = __s, *__t1 =__t; \ | |
59 | switch ((align)) \ | |
60 | { \ | |
61 | case 0: \ | |
62 | *__t2 = *__s2; \ | |
63 | break; \ | |
64 | default: \ | |
65 | *__t1++ = *__s1++; \ | |
66 | *__t1 = *__s1; \ | |
67 | break; \ | |
68 | } \ | |
69 | } | |
70 | ||
71 | int apply_relocate_add(Elf32_Shdr *sechdrs, | |
72 | const char *strtab, | |
73 | unsigned int symindex, | |
74 | unsigned int relsec, | |
75 | struct module *me) | |
76 | { | |
77 | unsigned int i; | |
78 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
79 | Elf32_Sym *sym; | |
80 | Elf32_Addr relocation; | |
81 | uint32_t *location; | |
82 | uint32_t value; | |
83 | unsigned short *hlocation; | |
84 | unsigned short hvalue; | |
85 | int svalue; | |
86 | int align; | |
87 | ||
88 | DEBUGP("Applying relocate section %u to %u\n", relsec, | |
89 | sechdrs[relsec].sh_info); | |
90 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
91 | /* This is where to make the change */ | |
92 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
93 | + rel[i].r_offset; | |
94 | /* This is the symbol it is referring to. Note that all | |
95 | undefined symbols have been resolved. */ | |
96 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
97 | + ELF32_R_SYM(rel[i].r_info); | |
98 | relocation = sym->st_value + rel[i].r_addend; | |
99 | align = (int)location & 3; | |
100 | ||
101 | switch (ELF32_R_TYPE(rel[i].r_info)) { | |
102 | case R_M32R_32_RELA: | |
103 | COPY_UNALIGNED_WORD (*location, value, align); | |
104 | value += relocation; | |
105 | COPY_UNALIGNED_WORD (value, *location, align); | |
106 | break; | |
107 | case R_M32R_HI16_ULO_RELA: | |
108 | COPY_UNALIGNED_WORD (*location, value, align); | |
109 | relocation = (relocation >>16) & 0xffff; | |
110 | /* RELA must has 0 at relocation field. */ | |
111 | value += relocation; | |
112 | COPY_UNALIGNED_WORD (value, *location, align); | |
113 | break; | |
114 | case R_M32R_HI16_SLO_RELA: | |
115 | COPY_UNALIGNED_WORD (*location, value, align); | |
116 | if (relocation & 0x8000) relocation += 0x10000; | |
117 | relocation = (relocation >>16) & 0xffff; | |
118 | /* RELA must has 0 at relocation field. */ | |
119 | value += relocation; | |
120 | COPY_UNALIGNED_WORD (value, *location, align); | |
121 | break; | |
122 | case R_M32R_16_RELA: | |
123 | hlocation = (unsigned short *)location; | |
124 | relocation = relocation & 0xffff; | |
125 | /* RELA must has 0 at relocation field. */ | |
126 | hvalue = relocation; | |
127 | COPY_UNALIGNED_WORD (hvalue, *hlocation, align); | |
128 | break; | |
129 | case R_M32R_SDA16_RELA: | |
130 | case R_M32R_LO16_RELA: | |
131 | COPY_UNALIGNED_WORD (*location, value, align); | |
132 | relocation = relocation & 0xffff; | |
133 | /* RELA must has 0 at relocation field. */ | |
134 | value += relocation; | |
135 | COPY_UNALIGNED_WORD (value, *location, align); | |
136 | break; | |
137 | case R_M32R_24_RELA: | |
138 | COPY_UNALIGNED_WORD (*location, value, align); | |
139 | relocation = relocation & 0xffffff; | |
140 | /* RELA must has 0 at relocation field. */ | |
141 | value += relocation; | |
142 | COPY_UNALIGNED_WORD (value, *location, align); | |
143 | break; | |
144 | case R_M32R_18_PCREL_RELA: | |
145 | relocation = (relocation - (Elf32_Addr) location); | |
146 | if (relocation < -0x20000 || 0x1fffc < relocation) | |
147 | { | |
148 | printk(KERN_ERR "module %s: relocation overflow: %u\n", | |
149 | me->name, relocation); | |
150 | return -ENOEXEC; | |
151 | } | |
152 | COPY_UNALIGNED_WORD (*location, value, align); | |
153 | if (value & 0xffff) | |
154 | { | |
155 | /* RELA must has 0 at relocation field. */ | |
156 | printk(KERN_ERR "module %s: illegal relocation field: %u\n", | |
157 | me->name, value); | |
158 | return -ENOEXEC; | |
159 | } | |
160 | relocation = (relocation >> 2) & 0xffff; | |
161 | value += relocation; | |
162 | COPY_UNALIGNED_WORD (value, *location, align); | |
163 | break; | |
164 | case R_M32R_10_PCREL_RELA: | |
165 | hlocation = (unsigned short *)location; | |
166 | relocation = (relocation - (Elf32_Addr) location); | |
167 | COPY_UNALIGNED_HWORD (*hlocation, hvalue, align); | |
168 | svalue = (int)hvalue; | |
169 | svalue = (signed char)svalue << 2; | |
170 | relocation += svalue; | |
171 | relocation = (relocation >> 2) & 0xff; | |
172 | hvalue = hvalue & 0xff00; | |
173 | hvalue += relocation; | |
174 | COPY_UNALIGNED_HWORD (hvalue, *hlocation, align); | |
175 | break; | |
176 | case R_M32R_26_PCREL_RELA: | |
177 | relocation = (relocation - (Elf32_Addr) location); | |
178 | if (relocation < -0x2000000 || 0x1fffffc < relocation) | |
179 | { | |
180 | printk(KERN_ERR "module %s: relocation overflow: %u\n", | |
181 | me->name, relocation); | |
182 | return -ENOEXEC; | |
183 | } | |
184 | COPY_UNALIGNED_WORD (*location, value, align); | |
185 | if (value & 0xffffff) | |
186 | { | |
187 | /* RELA must has 0 at relocation field. */ | |
188 | printk(KERN_ERR "module %s: illegal relocation field: %u\n", | |
189 | me->name, value); | |
190 | return -ENOEXEC; | |
191 | } | |
192 | relocation = (relocation >> 2) & 0xffffff; | |
193 | value += relocation; | |
194 | COPY_UNALIGNED_WORD (value, *location, align); | |
195 | break; | |
196 | default: | |
197 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", | |
198 | me->name, ELF32_R_TYPE(rel[i].r_info)); | |
199 | return -ENOEXEC; | |
200 | } | |
201 | } | |
202 | return 0; | |
203 | } |