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 #else 36 static void *module_map(unsigned long size) 37 { 38 return vmalloc(size); 39 } 40 #endif /* CONFIG_SPARC64 */ 41 42 void *module_alloc(unsigned long size) 43 { 44 void *ret; 45 46 /* We handle the zero case fine, unlike vmalloc */ 47 if (size == 0) 48 return NULL; 49 50 ret = module_map(size); 51 if (ret) 52 memset(ret, 0, size); 53 54 return ret; 55 } 56 57 /* Make generic code ignore STT_REGISTER dummy undefined symbols. */ 58 int module_frob_arch_sections(Elf_Ehdr *hdr, 59 Elf_Shdr *sechdrs, 60 char *secstrings, 61 struct module *mod) 62 { 63 unsigned int symidx; 64 Elf_Sym *sym; 65 char *strtab; 66 int i; 67 68 for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) { 69 if (symidx == hdr->e_shnum-1) { 70 printk("%s: no symtab found.\n", mod->name); 71 return -ENOEXEC; 72 } 73 } 74 sym = (Elf_Sym *)sechdrs[symidx].sh_addr; 75 strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr; 76 77 for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) { 78 if (sym[i].st_shndx == SHN_UNDEF) { 79 if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) 80 sym[i].st_shndx = SHN_ABS; 81 } 82 } 83 return 0; 84 } 85 86 int apply_relocate_add(Elf_Shdr *sechdrs, 87 const char *strtab, 88 unsigned int symindex, 89 unsigned int relsec, 90 struct module *me) 91 { 92 unsigned int i; 93 Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr; 94 Elf_Sym *sym; 95 u8 *location; 96 u32 *loc32; 97 98 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 99 Elf_Addr v; 100 101 /* This is where to make the change */ 102 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr 103 + rel[i].r_offset; 104 loc32 = (u32 *) location; 105 106 #ifdef CONFIG_SPARC64 107 BUG_ON(((u64)location >> (u64)32) != (u64)0); 108 #endif /* CONFIG_SPARC64 */ 109 110 /* This is the symbol it is referring to. Note that all 111 undefined symbols have been resolved. */ 112 sym = (Elf_Sym *)sechdrs[symindex].sh_addr 113 + ELF_R_SYM(rel[i].r_info); 114 v = sym->st_value + rel[i].r_addend; 115 116 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) { 117 case R_SPARC_DISP32: 118 v -= (Elf_Addr) location; 119 *loc32 = v; 120 break; 121 #ifdef CONFIG_SPARC64 122 case R_SPARC_64: 123 location[0] = v >> 56; 124 location[1] = v >> 48; 125 location[2] = v >> 40; 126 location[3] = v >> 32; 127 location[4] = v >> 24; 128 location[5] = v >> 16; 129 location[6] = v >> 8; 130 location[7] = v >> 0; 131 break; 132 133 case R_SPARC_WDISP19: 134 v -= (Elf_Addr) location; 135 *loc32 = (*loc32 & ~0x7ffff) | 136 ((v >> 2) & 0x7ffff); 137 break; 138 139 case R_SPARC_OLO10: 140 *loc32 = (*loc32 & ~0x1fff) | 141 (((v & 0x3ff) + 142 (ELF_R_TYPE(rel[i].r_info) >> 8)) 143 & 0x1fff); 144 break; 145 #endif /* CONFIG_SPARC64 */ 146 147 case R_SPARC_32: 148 case R_SPARC_UA32: 149 location[0] = v >> 24; 150 location[1] = v >> 16; 151 location[2] = v >> 8; 152 location[3] = v >> 0; 153 break; 154 155 case R_SPARC_WDISP30: 156 v -= (Elf_Addr) location; 157 *loc32 = (*loc32 & ~0x3fffffff) | 158 ((v >> 2) & 0x3fffffff); 159 break; 160 161 case R_SPARC_WDISP22: 162 v -= (Elf_Addr) location; 163 *loc32 = (*loc32 & ~0x3fffff) | 164 ((v >> 2) & 0x3fffff); 165 break; 166 167 case R_SPARC_LO10: 168 *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff); 169 break; 170 171 case R_SPARC_HI22: 172 *loc32 = (*loc32 & ~0x3fffff) | 173 ((v >> 10) & 0x3fffff); 174 break; 175 176 default: 177 printk(KERN_ERR "module %s: Unknown relocation: %x\n", 178 me->name, 179 (int) (ELF_R_TYPE(rel[i].r_info) & 0xff)); 180 return -ENOEXEC; 181 } 182 } 183 return 0; 184 } 185 186 #ifdef CONFIG_SPARC64 187 static void do_patch_sections(const Elf_Ehdr *hdr, 188 const Elf_Shdr *sechdrs) 189 { 190 const Elf_Shdr *s, *sun4v_1insn = NULL, *sun4v_2insn = NULL; 191 char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 192 193 for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { 194 if (!strcmp(".sun4v_1insn_patch", secstrings + s->sh_name)) 195 sun4v_1insn = s; 196 if (!strcmp(".sun4v_2insn_patch", secstrings + s->sh_name)) 197 sun4v_2insn = s; 198 } 199 200 if (sun4v_1insn && tlb_type == hypervisor) { 201 void *p = (void *) sun4v_1insn->sh_addr; 202 sun4v_patch_1insn_range(p, p + sun4v_1insn->sh_size); 203 } 204 if (sun4v_2insn && tlb_type == hypervisor) { 205 void *p = (void *) sun4v_2insn->sh_addr; 206 sun4v_patch_2insn_range(p, p + sun4v_2insn->sh_size); 207 } 208 } 209 210 int module_finalize(const Elf_Ehdr *hdr, 211 const Elf_Shdr *sechdrs, 212 struct module *me) 213 { 214 /* make jump label nops */ 215 jump_label_apply_nops(me); 216 217 do_patch_sections(hdr, sechdrs); 218 219 /* Cheetah's I-cache is fully coherent. */ 220 if (tlb_type == spitfire) { 221 unsigned long va; 222 223 flushw_all(); 224 for (va = 0; va < (PAGE_SIZE << 1); va += 32) 225 spitfire_put_icache_tag(va, 0x0); 226 __asm__ __volatile__("flush %g6"); 227 } 228 229 return 0; 230 } 231 #endif /* CONFIG_SPARC64 */ 232