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 ret = ERR_PTR(-ENOMEM); 53 else 54 memset(ret, 0, size); 55 56 return ret; 57 } 58 59 /* Make generic code ignore STT_REGISTER dummy undefined symbols. */ 60 int module_frob_arch_sections(Elf_Ehdr *hdr, 61 Elf_Shdr *sechdrs, 62 char *secstrings, 63 struct module *mod) 64 { 65 unsigned int symidx; 66 Elf_Sym *sym; 67 char *strtab; 68 int i; 69 70 for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) { 71 if (symidx == hdr->e_shnum-1) { 72 printk("%s: no symtab found.\n", mod->name); 73 return -ENOEXEC; 74 } 75 } 76 sym = (Elf_Sym *)sechdrs[symidx].sh_addr; 77 strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr; 78 79 for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) { 80 if (sym[i].st_shndx == SHN_UNDEF) { 81 if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) 82 sym[i].st_shndx = SHN_ABS; 83 } 84 } 85 return 0; 86 } 87 88 int apply_relocate_add(Elf_Shdr *sechdrs, 89 const char *strtab, 90 unsigned int symindex, 91 unsigned int relsec, 92 struct module *me) 93 { 94 unsigned int i; 95 Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr; 96 Elf_Sym *sym; 97 u8 *location; 98 u32 *loc32; 99 100 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 101 Elf_Addr v; 102 103 /* This is where to make the change */ 104 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr 105 + rel[i].r_offset; 106 loc32 = (u32 *) location; 107 108 #ifdef CONFIG_SPARC64 109 BUG_ON(((u64)location >> (u64)32) != (u64)0); 110 #endif /* CONFIG_SPARC64 */ 111 112 /* This is the symbol it is referring to. Note that all 113 undefined symbols have been resolved. */ 114 sym = (Elf_Sym *)sechdrs[symindex].sh_addr 115 + ELF_R_SYM(rel[i].r_info); 116 v = sym->st_value + rel[i].r_addend; 117 118 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) { 119 #ifdef CONFIG_SPARC64 120 case R_SPARC_64: 121 location[0] = v >> 56; 122 location[1] = v >> 48; 123 location[2] = v >> 40; 124 location[3] = v >> 32; 125 location[4] = v >> 24; 126 location[5] = v >> 16; 127 location[6] = v >> 8; 128 location[7] = v >> 0; 129 break; 130 131 case R_SPARC_DISP32: 132 v -= (Elf_Addr) location; 133 *loc32 = v; 134 break; 135 136 case R_SPARC_WDISP19: 137 v -= (Elf_Addr) location; 138 *loc32 = (*loc32 & ~0x7ffff) | 139 ((v >> 2) & 0x7ffff); 140 break; 141 142 case R_SPARC_OLO10: 143 *loc32 = (*loc32 & ~0x1fff) | 144 (((v & 0x3ff) + 145 (ELF_R_TYPE(rel[i].r_info) >> 8)) 146 & 0x1fff); 147 break; 148 #endif /* CONFIG_SPARC64 */ 149 150 case R_SPARC_32: 151 case R_SPARC_UA32: 152 location[0] = v >> 24; 153 location[1] = v >> 16; 154 location[2] = v >> 8; 155 location[3] = v >> 0; 156 break; 157 158 case R_SPARC_WDISP30: 159 v -= (Elf_Addr) location; 160 *loc32 = (*loc32 & ~0x3fffffff) | 161 ((v >> 2) & 0x3fffffff); 162 break; 163 164 case R_SPARC_WDISP22: 165 v -= (Elf_Addr) location; 166 *loc32 = (*loc32 & ~0x3fffff) | 167 ((v >> 2) & 0x3fffff); 168 break; 169 170 case R_SPARC_LO10: 171 *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff); 172 break; 173 174 case R_SPARC_HI22: 175 *loc32 = (*loc32 & ~0x3fffff) | 176 ((v >> 10) & 0x3fffff); 177 break; 178 179 default: 180 printk(KERN_ERR "module %s: Unknown relocation: %x\n", 181 me->name, 182 (int) (ELF_R_TYPE(rel[i].r_info) & 0xff)); 183 return -ENOEXEC; 184 } 185 } 186 return 0; 187 } 188 189 #ifdef CONFIG_SPARC64 190 static void do_patch_sections(const Elf_Ehdr *hdr, 191 const Elf_Shdr *sechdrs) 192 { 193 const Elf_Shdr *s, *sun4v_1insn = NULL, *sun4v_2insn = NULL; 194 char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 195 196 for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { 197 if (!strcmp(".sun4v_1insn_patch", secstrings + s->sh_name)) 198 sun4v_1insn = s; 199 if (!strcmp(".sun4v_2insn_patch", secstrings + s->sh_name)) 200 sun4v_2insn = s; 201 } 202 203 if (sun4v_1insn && tlb_type == hypervisor) { 204 void *p = (void *) sun4v_1insn->sh_addr; 205 sun4v_patch_1insn_range(p, p + sun4v_1insn->sh_size); 206 } 207 if (sun4v_2insn && tlb_type == hypervisor) { 208 void *p = (void *) sun4v_2insn->sh_addr; 209 sun4v_patch_2insn_range(p, p + sun4v_2insn->sh_size); 210 } 211 } 212 213 int module_finalize(const Elf_Ehdr *hdr, 214 const Elf_Shdr *sechdrs, 215 struct module *me) 216 { 217 /* make jump label nops */ 218 jump_label_apply_nops(me); 219 220 do_patch_sections(hdr, sechdrs); 221 222 /* Cheetah's I-cache is fully coherent. */ 223 if (tlb_type == spitfire) { 224 unsigned long va; 225 226 flushw_all(); 227 for (va = 0; va < (PAGE_SIZE << 1); va += 32) 228 spitfire_put_icache_tag(va, 0x0); 229 __asm__ __volatile__("flush %g6"); 230 } 231 232 return 0; 233 } 234 #endif /* CONFIG_SPARC64 */ 235