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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 | /* Kernel module help for M32R. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/moduleloader.h> #include <linux/elf.h> #include <linux/vmalloc.h> #include <linux/fs.h> #include <linux/string.h> #include <linux/kernel.h> #if 0 #define DEBUGP printk #else #define DEBUGP(fmt...) #endif void *module_alloc(unsigned long size) { if (size == 0) return NULL; #ifdef CONFIG_MMU return vmalloc_exec(size); #else return vmalloc(size); #endif } /* Free memory returned from module_alloc */ void module_free(struct module *mod, void *module_region) { vfree(module_region); /* FIXME: If module_region == mod->init_region, trim exception table entries. */ } /* We don't need anything special. */ int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, char *secstrings, struct module *mod) { return 0; } #define COPY_UNALIGNED_WORD(sw, tw, align) \ { \ void *__s = &(sw), *__t = &(tw); \ unsigned short *__s2 = __s, *__t2 =__t; \ unsigned char *__s1 = __s, *__t1 =__t; \ switch ((align)) \ { \ case 0: \ *(unsigned long *) __t = *(unsigned long *) __s; \ break; \ case 2: \ *__t2++ = *__s2++; \ *__t2 = *__s2; \ break; \ default: \ *__t1++ = *__s1++; \ *__t1++ = *__s1++; \ *__t1++ = *__s1++; \ *__t1 = *__s1; \ break; \ } \ } #define COPY_UNALIGNED_HWORD(sw, tw, align) \ { \ void *__s = &(sw), *__t = &(tw); \ unsigned short *__s2 = __s, *__t2 =__t; \ unsigned char *__s1 = __s, *__t1 =__t; \ switch ((align)) \ { \ case 0: \ *__t2 = *__s2; \ break; \ default: \ *__t1++ = *__s1++; \ *__t1 = *__s1; \ break; \ } \ } int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, unsigned int relsec, struct module *me) { unsigned int i; Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; Elf32_Sym *sym; Elf32_Addr relocation; uint32_t *location; uint32_t value; unsigned short *hlocation; unsigned short hvalue; int svalue; int align; DEBUGP("Applying relocate section %u to %u\n", relsec, sechdrs[relsec].sh_info); for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { /* This is where to make the change */ location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + rel[i].r_offset; /* This is the symbol it is referring to. Note that all undefined symbols have been resolved. */ sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + ELF32_R_SYM(rel[i].r_info); relocation = sym->st_value + rel[i].r_addend; align = (int)location & 3; switch (ELF32_R_TYPE(rel[i].r_info)) { case R_M32R_32_RELA: COPY_UNALIGNED_WORD (*location, value, align); value += relocation; COPY_UNALIGNED_WORD (value, *location, align); break; case R_M32R_HI16_ULO_RELA: COPY_UNALIGNED_WORD (*location, value, align); relocation = (relocation >>16) & 0xffff; /* RELA must has 0 at relocation field. */ value += relocation; COPY_UNALIGNED_WORD (value, *location, align); break; case R_M32R_HI16_SLO_RELA: COPY_UNALIGNED_WORD (*location, value, align); if (relocation & 0x8000) relocation += 0x10000; relocation = (relocation >>16) & 0xffff; /* RELA must has 0 at relocation field. */ value += relocation; COPY_UNALIGNED_WORD (value, *location, align); break; case R_M32R_16_RELA: hlocation = (unsigned short *)location; relocation = relocation & 0xffff; /* RELA must has 0 at relocation field. */ hvalue = relocation; COPY_UNALIGNED_WORD (hvalue, *hlocation, align); break; case R_M32R_SDA16_RELA: case R_M32R_LO16_RELA: COPY_UNALIGNED_WORD (*location, value, align); relocation = relocation & 0xffff; /* RELA must has 0 at relocation field. */ value += relocation; COPY_UNALIGNED_WORD (value, *location, align); break; case R_M32R_24_RELA: COPY_UNALIGNED_WORD (*location, value, align); relocation = relocation & 0xffffff; /* RELA must has 0 at relocation field. */ value += relocation; COPY_UNALIGNED_WORD (value, *location, align); break; case R_M32R_18_PCREL_RELA: relocation = (relocation - (Elf32_Addr) location); if (relocation < -0x20000 || 0x1fffc < relocation) { printk(KERN_ERR "module %s: relocation overflow: %u\n", me->name, relocation); return -ENOEXEC; } COPY_UNALIGNED_WORD (*location, value, align); if (value & 0xffff) { /* RELA must has 0 at relocation field. */ printk(KERN_ERR "module %s: illegal relocation field: %u\n", me->name, value); return -ENOEXEC; } relocation = (relocation >> 2) & 0xffff; value += relocation; COPY_UNALIGNED_WORD (value, *location, align); break; case R_M32R_10_PCREL_RELA: hlocation = (unsigned short *)location; relocation = (relocation - (Elf32_Addr) location); COPY_UNALIGNED_HWORD (*hlocation, hvalue, align); svalue = (int)hvalue; svalue = (signed char)svalue << 2; relocation += svalue; relocation = (relocation >> 2) & 0xff; hvalue = hvalue & 0xff00; hvalue += relocation; COPY_UNALIGNED_HWORD (hvalue, *hlocation, align); break; case R_M32R_26_PCREL_RELA: relocation = (relocation - (Elf32_Addr) location); if (relocation < -0x2000000 || 0x1fffffc < relocation) { printk(KERN_ERR "module %s: relocation overflow: %u\n", me->name, relocation); return -ENOEXEC; } COPY_UNALIGNED_WORD (*location, value, align); if (value & 0xffffff) { /* RELA must has 0 at relocation field. */ printk(KERN_ERR "module %s: illegal relocation field: %u\n", me->name, value); return -ENOEXEC; } relocation = (relocation >> 2) & 0xffffff; value += relocation; COPY_UNALIGNED_WORD (value, *location, align); break; default: printk(KERN_ERR "module %s: Unknown relocation: %u\n", me->name, ELF32_R_TYPE(rel[i].r_info)); return -ENOEXEC; } } return 0; } int apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, unsigned int relsec, struct module *me) { #if 0 printk(KERN_ERR "module %s: REL RELOCATION unsupported\n", me->name); return -ENOEXEC; #endif return 0; } int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *me) { return 0; } void module_arch_cleanup(struct module *mod) { } |