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