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 #include <asm/cacheflush.h> 20 21 #include "entry.h" 22 23 #ifdef CONFIG_SPARC64 24 25 #include <linux/jump_label.h> 26 27 static void *module_map(unsigned long size) 28 { 29 if (PAGE_ALIGN(size) > MODULES_LEN) 30 return NULL; 31 return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, 32 GFP_KERNEL, PAGE_KERNEL, -1, 33 __builtin_return_address(0)); 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 /* Make generic code ignore STT_REGISTER dummy undefined symbols. */ 75 int module_frob_arch_sections(Elf_Ehdr *hdr, 76 Elf_Shdr *sechdrs, 77 char *secstrings, 78 struct module *mod) 79 { 80 unsigned int symidx; 81 Elf_Sym *sym; 82 char *strtab; 83 int i; 84 85 for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) { 86 if (symidx == hdr->e_shnum-1) { 87 printk("%s: no symtab found.\n", mod->name); 88 return -ENOEXEC; 89 } 90 } 91 sym = (Elf_Sym *)sechdrs[symidx].sh_addr; 92 strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr; 93 94 for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) { 95 if (sym[i].st_shndx == SHN_UNDEF) { 96 if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) { 97 sym[i].st_shndx = SHN_ABS; 98 } else { 99 char *name = strtab + sym[i].st_name; 100 dot2underscore(name); 101 } 102 } 103 } 104 return 0; 105 } 106 107 int apply_relocate_add(Elf_Shdr *sechdrs, 108 const char *strtab, 109 unsigned int symindex, 110 unsigned int relsec, 111 struct module *me) 112 { 113 unsigned int i; 114 Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr; 115 Elf_Sym *sym; 116 u8 *location; 117 u32 *loc32; 118 119 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 120 Elf_Addr v; 121 122 /* This is where to make the change */ 123 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr 124 + rel[i].r_offset; 125 loc32 = (u32 *) location; 126 127 #ifdef CONFIG_SPARC64 128 BUG_ON(((u64)location >> (u64)32) != (u64)0); 129 #endif /* CONFIG_SPARC64 */ 130 131 /* This is the symbol it is referring to. Note that all 132 undefined symbols have been resolved. */ 133 sym = (Elf_Sym *)sechdrs[symindex].sh_addr 134 + ELF_R_SYM(rel[i].r_info); 135 v = sym->st_value + rel[i].r_addend; 136 137 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) { 138 #ifdef CONFIG_SPARC64 139 case R_SPARC_64: 140 location[0] = v >> 56; 141 location[1] = v >> 48; 142 location[2] = v >> 40; 143 location[3] = v >> 32; 144 location[4] = v >> 24; 145 location[5] = v >> 16; 146 location[6] = v >> 8; 147 location[7] = v >> 0; 148 break; 149 150 case R_SPARC_DISP32: 151 v -= (Elf_Addr) location; 152 *loc32 = v; 153 break; 154 155 case R_SPARC_WDISP19: 156 v -= (Elf_Addr) location; 157 *loc32 = (*loc32 & ~0x7ffff) | 158 ((v >> 2) & 0x7ffff); 159 break; 160 161 case R_SPARC_OLO10: 162 *loc32 = (*loc32 & ~0x1fff) | 163 (((v & 0x3ff) + 164 (ELF_R_TYPE(rel[i].r_info) >> 8)) 165 & 0x1fff); 166 break; 167 #endif /* CONFIG_SPARC64 */ 168 169 case R_SPARC_32: 170 case R_SPARC_UA32: 171 location[0] = v >> 24; 172 location[1] = v >> 16; 173 location[2] = v >> 8; 174 location[3] = v >> 0; 175 break; 176 177 case R_SPARC_WDISP30: 178 v -= (Elf_Addr) location; 179 *loc32 = (*loc32 & ~0x3fffffff) | 180 ((v >> 2) & 0x3fffffff); 181 break; 182 183 case R_SPARC_WDISP22: 184 v -= (Elf_Addr) location; 185 *loc32 = (*loc32 & ~0x3fffff) | 186 ((v >> 2) & 0x3fffff); 187 break; 188 189 case R_SPARC_LO10: 190 *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff); 191 break; 192 193 case R_SPARC_HI22: 194 *loc32 = (*loc32 & ~0x3fffff) | 195 ((v >> 10) & 0x3fffff); 196 break; 197 198 default: 199 printk(KERN_ERR "module %s: Unknown relocation: %x\n", 200 me->name, 201 (int) (ELF_R_TYPE(rel[i].r_info) & 0xff)); 202 return -ENOEXEC; 203 } 204 } 205 return 0; 206 } 207 208 #ifdef CONFIG_SPARC64 209 static void do_patch_sections(const Elf_Ehdr *hdr, 210 const Elf_Shdr *sechdrs) 211 { 212 const Elf_Shdr *s, *sun4v_1insn = NULL, *sun4v_2insn = NULL; 213 char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 214 215 for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { 216 if (!strcmp(".sun4v_1insn_patch", secstrings + s->sh_name)) 217 sun4v_1insn = s; 218 if (!strcmp(".sun4v_2insn_patch", secstrings + s->sh_name)) 219 sun4v_2insn = s; 220 } 221 222 if (sun4v_1insn && tlb_type == hypervisor) { 223 void *p = (void *) sun4v_1insn->sh_addr; 224 sun4v_patch_1insn_range(p, p + sun4v_1insn->sh_size); 225 } 226 if (sun4v_2insn && tlb_type == hypervisor) { 227 void *p = (void *) sun4v_2insn->sh_addr; 228 sun4v_patch_2insn_range(p, p + sun4v_2insn->sh_size); 229 } 230 } 231 232 int module_finalize(const Elf_Ehdr *hdr, 233 const Elf_Shdr *sechdrs, 234 struct module *me) 235 { 236 /* make jump label nops */ 237 jump_label_apply_nops(me); 238 239 do_patch_sections(hdr, sechdrs); 240 241 /* Cheetah's I-cache is fully coherent. */ 242 if (tlb_type == spitfire) { 243 unsigned long va; 244 245 flushw_all(); 246 for (va = 0; va < (PAGE_SIZE << 1); va += 32) 247 spitfire_put_icache_tag(va, 0x0); 248 __asm__ __volatile__("flush %g6"); 249 } 250 251 return 0; 252 } 253 #endif /* CONFIG_SPARC64 */ 254