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 } 79 80 /* Make generic code ignore STT_REGISTER dummy undefined symbols. */ 81 int module_frob_arch_sections(Elf_Ehdr *hdr, 82 Elf_Shdr *sechdrs, 83 char *secstrings, 84 struct module *mod) 85 { 86 unsigned int symidx; 87 Elf_Sym *sym; 88 char *strtab; 89 int i; 90 91 for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) { 92 if (symidx == hdr->e_shnum-1) { 93 printk("%s: no symtab found.\n", mod->name); 94 return -ENOEXEC; 95 } 96 } 97 sym = (Elf_Sym *)sechdrs[symidx].sh_addr; 98 strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr; 99 100 for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) { 101 if (sym[i].st_shndx == SHN_UNDEF) { 102 if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) { 103 sym[i].st_shndx = SHN_ABS; 104 } else { 105 char *name = strtab + sym[i].st_name; 106 dot2underscore(name); 107 } 108 } 109 } 110 return 0; 111 } 112 113 int apply_relocate(Elf_Shdr *sechdrs, 114 const char *strtab, 115 unsigned int symindex, 116 unsigned int relsec, 117 struct module *me) 118 { 119 printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n", 120 me->name); 121 return -ENOEXEC; 122 } 123 124 int apply_relocate_add(Elf_Shdr *sechdrs, 125 const char *strtab, 126 unsigned int symindex, 127 unsigned int relsec, 128 struct module *me) 129 { 130 unsigned int i; 131 Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr; 132 Elf_Sym *sym; 133 u8 *location; 134 u32 *loc32; 135 136 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 137 Elf_Addr v; 138 139 /* This is where to make the change */ 140 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr 141 + rel[i].r_offset; 142 loc32 = (u32 *) location; 143 144 #ifdef CONFIG_SPARC64 145 BUG_ON(((u64)location >> (u64)32) != (u64)0); 146 #endif /* CONFIG_SPARC64 */ 147 148 /* This is the symbol it is referring to. Note that all 149 undefined symbols have been resolved. */ 150 sym = (Elf_Sym *)sechdrs[symindex].sh_addr 151 + ELF_R_SYM(rel[i].r_info); 152 v = sym->st_value + rel[i].r_addend; 153 154 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) { 155 #ifdef CONFIG_SPARC64 156 case R_SPARC_64: 157 location[0] = v >> 56; 158 location[1] = v >> 48; 159 location[2] = v >> 40; 160 location[3] = v >> 32; 161 location[4] = v >> 24; 162 location[5] = v >> 16; 163 location[6] = v >> 8; 164 location[7] = v >> 0; 165 break; 166 167 case R_SPARC_DISP32: 168 v -= (Elf_Addr) location; 169 *loc32 = v; 170 break; 171 172 case R_SPARC_WDISP19: 173 v -= (Elf_Addr) location; 174 *loc32 = (*loc32 & ~0x7ffff) | 175 ((v >> 2) & 0x7ffff); 176 break; 177 178 case R_SPARC_OLO10: 179 *loc32 = (*loc32 & ~0x1fff) | 180 (((v & 0x3ff) + 181 (ELF_R_TYPE(rel[i].r_info) >> 8)) 182 & 0x1fff); 183 break; 184 #endif /* CONFIG_SPARC64 */ 185 186 case R_SPARC_32: 187 case R_SPARC_UA32: 188 location[0] = v >> 24; 189 location[1] = v >> 16; 190 location[2] = v >> 8; 191 location[3] = v >> 0; 192 break; 193 194 case R_SPARC_WDISP30: 195 v -= (Elf_Addr) location; 196 *loc32 = (*loc32 & ~0x3fffffff) | 197 ((v >> 2) & 0x3fffffff); 198 break; 199 200 case R_SPARC_WDISP22: 201 v -= (Elf_Addr) location; 202 *loc32 = (*loc32 & ~0x3fffff) | 203 ((v >> 2) & 0x3fffff); 204 break; 205 206 case R_SPARC_LO10: 207 *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff); 208 break; 209 210 case R_SPARC_HI22: 211 *loc32 = (*loc32 & ~0x3fffff) | 212 ((v >> 10) & 0x3fffff); 213 break; 214 215 default: 216 printk(KERN_ERR "module %s: Unknown relocation: %x\n", 217 me->name, 218 (int) (ELF_R_TYPE(rel[i].r_info) & 0xff)); 219 return -ENOEXEC; 220 }; 221 } 222 return 0; 223 } 224 225 #ifdef CONFIG_SPARC64 226 int module_finalize(const Elf_Ehdr *hdr, 227 const Elf_Shdr *sechdrs, 228 struct module *me) 229 { 230 /* Cheetah's I-cache is fully coherent. */ 231 if (tlb_type == spitfire) { 232 unsigned long va; 233 234 flushw_all(); 235 for (va = 0; va < (PAGE_SIZE << 1); va += 32) 236 spitfire_put_icache_tag(va, 0x0); 237 __asm__ __volatile__("flush %g6"); 238 } 239 240 return 0; 241 } 242 #else 243 int module_finalize(const Elf_Ehdr *hdr, 244 const Elf_Shdr *sechdrs, 245 struct module *me) 246 { 247 return 0; 248 } 249 #endif /* CONFIG_SPARC64 */ 250 251 void module_arch_cleanup(struct module *mod) 252 { 253 } 254