1 /* Kernel module help for sparc64. 2 * 3 * Copyright (C) 2001 Rusty Russell. 4 * Copyright (C) 2002 David S. Miller. 5 */ 6 7 #include <linux/moduleloader.h> 8 #include <linux/kernel.h> 9 #include <linux/elf.h> 10 #include <linux/vmalloc.h> 11 #include <linux/fs.h> 12 #include <linux/gfp.h> 13 #include <linux/string.h> 14 #include <linux/ctype.h> 15 #include <linux/mm.h> 16 17 #include <asm/processor.h> 18 #include <asm/spitfire.h> 19 20 #ifdef CONFIG_SPARC64 21 22 #include <linux/jump_label.h> 23 24 static void *module_map(unsigned long size) 25 { 26 struct vm_struct *area; 27 28 size = PAGE_ALIGN(size); 29 if (!size || size > MODULES_LEN) 30 return NULL; 31 32 area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END); 33 if (!area) 34 return NULL; 35 36 return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL); 37 } 38 39 static char *dot2underscore(char *name) 40 { 41 return name; 42 } 43 #else 44 static void *module_map(unsigned long size) 45 { 46 return vmalloc(size); 47 } 48 49 /* Replace references to .func with _Func */ 50 static char *dot2underscore(char *name) 51 { 52 if (name[0] == '.') { 53 name[0] = '_'; 54 name[1] = toupper(name[1]); 55 } 56 return name; 57 } 58 #endif /* CONFIG_SPARC64 */ 59 60 void *module_alloc(unsigned long size) 61 { 62 void *ret; 63 64 /* We handle the zero case fine, unlike vmalloc */ 65 if (size == 0) 66 return NULL; 67 68 ret = module_map(size); 69 if (!ret) 70 ret = ERR_PTR(-ENOMEM); 71 else 72 memset(ret, 0, size); 73 74 return ret; 75 } 76 77 /* Free memory returned from module_core_alloc/module_init_alloc */ 78 void module_free(struct module *mod, void *module_region) 79 { 80 vfree(module_region); 81 } 82 83 /* Make generic code ignore STT_REGISTER dummy undefined symbols. */ 84 int module_frob_arch_sections(Elf_Ehdr *hdr, 85 Elf_Shdr *sechdrs, 86 char *secstrings, 87 struct module *mod) 88 { 89 unsigned int symidx; 90 Elf_Sym *sym; 91 char *strtab; 92 int i; 93 94 for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) { 95 if (symidx == hdr->e_shnum-1) { 96 printk("%s: no symtab found.\n", mod->name); 97 return -ENOEXEC; 98 } 99 } 100 sym = (Elf_Sym *)sechdrs[symidx].sh_addr; 101 strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr; 102 103 for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) { 104 if (sym[i].st_shndx == SHN_UNDEF) { 105 if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) { 106 sym[i].st_shndx = SHN_ABS; 107 } else { 108 char *name = strtab + sym[i].st_name; 109 dot2underscore(name); 110 } 111 } 112 } 113 return 0; 114 } 115 116 int apply_relocate(Elf_Shdr *sechdrs, 117 const char *strtab, 118 unsigned int symindex, 119 unsigned int relsec, 120 struct module *me) 121 { 122 printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n", 123 me->name); 124 return -ENOEXEC; 125 } 126 127 int apply_relocate_add(Elf_Shdr *sechdrs, 128 const char *strtab, 129 unsigned int symindex, 130 unsigned int relsec, 131 struct module *me) 132 { 133 unsigned int i; 134 Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr; 135 Elf_Sym *sym; 136 u8 *location; 137 u32 *loc32; 138 139 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 140 Elf_Addr v; 141 142 /* This is where to make the change */ 143 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr 144 + rel[i].r_offset; 145 loc32 = (u32 *) location; 146 147 #ifdef CONFIG_SPARC64 148 BUG_ON(((u64)location >> (u64)32) != (u64)0); 149 #endif /* CONFIG_SPARC64 */ 150 151 /* This is the symbol it is referring to. Note that all 152 undefined symbols have been resolved. */ 153 sym = (Elf_Sym *)sechdrs[symindex].sh_addr 154 + ELF_R_SYM(rel[i].r_info); 155 v = sym->st_value + rel[i].r_addend; 156 157 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) { 158 #ifdef CONFIG_SPARC64 159 case R_SPARC_64: 160 location[0] = v >> 56; 161 location[1] = v >> 48; 162 location[2] = v >> 40; 163 location[3] = v >> 32; 164 location[4] = v >> 24; 165 location[5] = v >> 16; 166 location[6] = v >> 8; 167 location[7] = v >> 0; 168 break; 169 170 case R_SPARC_DISP32: 171 v -= (Elf_Addr) location; 172 *loc32 = v; 173 break; 174 175 case R_SPARC_WDISP19: 176 v -= (Elf_Addr) location; 177 *loc32 = (*loc32 & ~0x7ffff) | 178 ((v >> 2) & 0x7ffff); 179 break; 180 181 case R_SPARC_OLO10: 182 *loc32 = (*loc32 & ~0x1fff) | 183 (((v & 0x3ff) + 184 (ELF_R_TYPE(rel[i].r_info) >> 8)) 185 & 0x1fff); 186 break; 187 #endif /* CONFIG_SPARC64 */ 188 189 case R_SPARC_32: 190 case R_SPARC_UA32: 191 location[0] = v >> 24; 192 location[1] = v >> 16; 193 location[2] = v >> 8; 194 location[3] = v >> 0; 195 break; 196 197 case R_SPARC_WDISP30: 198 v -= (Elf_Addr) location; 199 *loc32 = (*loc32 & ~0x3fffffff) | 200 ((v >> 2) & 0x3fffffff); 201 break; 202 203 case R_SPARC_WDISP22: 204 v -= (Elf_Addr) location; 205 *loc32 = (*loc32 & ~0x3fffff) | 206 ((v >> 2) & 0x3fffff); 207 break; 208 209 case R_SPARC_LO10: 210 *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff); 211 break; 212 213 case R_SPARC_HI22: 214 *loc32 = (*loc32 & ~0x3fffff) | 215 ((v >> 10) & 0x3fffff); 216 break; 217 218 default: 219 printk(KERN_ERR "module %s: Unknown relocation: %x\n", 220 me->name, 221 (int) (ELF_R_TYPE(rel[i].r_info) & 0xff)); 222 return -ENOEXEC; 223 }; 224 } 225 return 0; 226 } 227 228 #ifdef CONFIG_SPARC64 229 int module_finalize(const Elf_Ehdr *hdr, 230 const Elf_Shdr *sechdrs, 231 struct module *me) 232 { 233 /* make jump label nops */ 234 jump_label_apply_nops(me); 235 236 /* Cheetah's I-cache is fully coherent. */ 237 if (tlb_type == spitfire) { 238 unsigned long va; 239 240 flushw_all(); 241 for (va = 0; va < (PAGE_SIZE << 1); va += 32) 242 spitfire_put_icache_tag(va, 0x0); 243 __asm__ __volatile__("flush %g6"); 244 } 245 246 return 0; 247 } 248 #else 249 int module_finalize(const Elf_Ehdr *hdr, 250 const Elf_Shdr *sechdrs, 251 struct module *me) 252 { 253 return 0; 254 } 255 #endif /* CONFIG_SPARC64 */ 256 257 void module_arch_cleanup(struct module *mod) 258 { 259 } 260