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 /* Make generic code ignore STT_REGISTER dummy undefined symbols. */ 72 int module_frob_arch_sections(Elf_Ehdr *hdr, 73 Elf_Shdr *sechdrs, 74 char *secstrings, 75 struct module *mod) 76 { 77 unsigned int symidx; 78 Elf_Sym *sym; 79 char *strtab; 80 int i; 81 82 for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) { 83 if (symidx == hdr->e_shnum-1) { 84 printk("%s: no symtab found.\n", mod->name); 85 return -ENOEXEC; 86 } 87 } 88 sym = (Elf_Sym *)sechdrs[symidx].sh_addr; 89 strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr; 90 91 for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) { 92 if (sym[i].st_shndx == SHN_UNDEF) { 93 if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) { 94 sym[i].st_shndx = SHN_ABS; 95 } else { 96 char *name = strtab + sym[i].st_name; 97 dot2underscore(name); 98 } 99 } 100 } 101 return 0; 102 } 103 104 int apply_relocate_add(Elf_Shdr *sechdrs, 105 const char *strtab, 106 unsigned int symindex, 107 unsigned int relsec, 108 struct module *me) 109 { 110 unsigned int i; 111 Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr; 112 Elf_Sym *sym; 113 u8 *location; 114 u32 *loc32; 115 116 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 117 Elf_Addr v; 118 119 /* This is where to make the change */ 120 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr 121 + rel[i].r_offset; 122 loc32 = (u32 *) location; 123 124 #ifdef CONFIG_SPARC64 125 BUG_ON(((u64)location >> (u64)32) != (u64)0); 126 #endif /* CONFIG_SPARC64 */ 127 128 /* This is the symbol it is referring to. Note that all 129 undefined symbols have been resolved. */ 130 sym = (Elf_Sym *)sechdrs[symindex].sh_addr 131 + ELF_R_SYM(rel[i].r_info); 132 v = sym->st_value + rel[i].r_addend; 133 134 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) { 135 #ifdef CONFIG_SPARC64 136 case R_SPARC_64: 137 location[0] = v >> 56; 138 location[1] = v >> 48; 139 location[2] = v >> 40; 140 location[3] = v >> 32; 141 location[4] = v >> 24; 142 location[5] = v >> 16; 143 location[6] = v >> 8; 144 location[7] = v >> 0; 145 break; 146 147 case R_SPARC_DISP32: 148 v -= (Elf_Addr) location; 149 *loc32 = v; 150 break; 151 152 case R_SPARC_WDISP19: 153 v -= (Elf_Addr) location; 154 *loc32 = (*loc32 & ~0x7ffff) | 155 ((v >> 2) & 0x7ffff); 156 break; 157 158 case R_SPARC_OLO10: 159 *loc32 = (*loc32 & ~0x1fff) | 160 (((v & 0x3ff) + 161 (ELF_R_TYPE(rel[i].r_info) >> 8)) 162 & 0x1fff); 163 break; 164 #endif /* CONFIG_SPARC64 */ 165 166 case R_SPARC_32: 167 case R_SPARC_UA32: 168 location[0] = v >> 24; 169 location[1] = v >> 16; 170 location[2] = v >> 8; 171 location[3] = v >> 0; 172 break; 173 174 case R_SPARC_WDISP30: 175 v -= (Elf_Addr) location; 176 *loc32 = (*loc32 & ~0x3fffffff) | 177 ((v >> 2) & 0x3fffffff); 178 break; 179 180 case R_SPARC_WDISP22: 181 v -= (Elf_Addr) location; 182 *loc32 = (*loc32 & ~0x3fffff) | 183 ((v >> 2) & 0x3fffff); 184 break; 185 186 case R_SPARC_LO10: 187 *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff); 188 break; 189 190 case R_SPARC_HI22: 191 *loc32 = (*loc32 & ~0x3fffff) | 192 ((v >> 10) & 0x3fffff); 193 break; 194 195 default: 196 printk(KERN_ERR "module %s: Unknown relocation: %x\n", 197 me->name, 198 (int) (ELF_R_TYPE(rel[i].r_info) & 0xff)); 199 return -ENOEXEC; 200 } 201 } 202 return 0; 203 } 204 205 #ifdef CONFIG_SPARC64 206 int module_finalize(const Elf_Ehdr *hdr, 207 const Elf_Shdr *sechdrs, 208 struct module *me) 209 { 210 /* make jump label nops */ 211 jump_label_apply_nops(me); 212 213 /* Cheetah's I-cache is fully coherent. */ 214 if (tlb_type == spitfire) { 215 unsigned long va; 216 217 flushw_all(); 218 for (va = 0; va < (PAGE_SIZE << 1); va += 32) 219 spitfire_put_icache_tag(va, 0x0); 220 __asm__ __volatile__("flush %g6"); 221 } 222 223 return 0; 224 } 225 #endif /* CONFIG_SPARC64 */ 226