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