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