Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |