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/string.h> 13#include <linux/slab.h> 14#include <linux/vmalloc.h> 15#include <linux/mm.h> 16 17#include <asm/processor.h> 18#include <asm/spitfire.h> 19 20static void *module_map(unsigned long size) 21{ 22 struct vm_struct *area; 23 24 size = PAGE_ALIGN(size); 25 if (!size || size > MODULES_LEN) 26 return NULL; 27 28 area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END); 29 if (!area) 30 return NULL; 31 32 return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL); 33} 34 35void *module_alloc(unsigned long size) 36{ 37 void *ret; 38 39 /* We handle the zero case fine, unlike vmalloc */ 40 if (size == 0) 41 return NULL; 42 43 ret = module_map(size); 44 if (!ret) 45 ret = ERR_PTR(-ENOMEM); 46 else 47 memset(ret, 0, size); 48 49 return ret; 50} 51 52/* Free memory returned from module_core_alloc/module_init_alloc */ 53void module_free(struct module *mod, void *module_region) 54{ 55 vfree(module_region); 56} 57 58/* Make generic code ignore STT_REGISTER dummy undefined symbols. */ 59int module_frob_arch_sections(Elf_Ehdr *hdr, 60 Elf_Shdr *sechdrs, 61 char *secstrings, 62 struct module *mod) 63{ 64 unsigned int symidx; 65 Elf64_Sym *sym; 66 const char *strtab; 67 int i; 68 69 for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) { 70 if (symidx == hdr->e_shnum-1) { 71 printk("%s: no symtab found.\n", mod->name); 72 return -ENOEXEC; 73 } 74 } 75 sym = (Elf64_Sym *)sechdrs[symidx].sh_addr; 76 strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr; 77 78 for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) { 79 if (sym[i].st_shndx == SHN_UNDEF && 80 ELF64_ST_TYPE(sym[i].st_info) == STT_REGISTER) 81 sym[i].st_shndx = SHN_ABS; 82 } 83 return 0; 84} 85 86int apply_relocate(Elf64_Shdr *sechdrs, 87 const char *strtab, 88 unsigned int symindex, 89 unsigned int relsec, 90 struct module *me) 91{ 92 printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n", 93 me->name); 94 return -ENOEXEC; 95} 96 97int apply_relocate_add(Elf64_Shdr *sechdrs, 98 const char *strtab, 99 unsigned int symindex, 100 unsigned int relsec, 101 struct module *me) 102{ 103 unsigned int i; 104 Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr; 105 Elf64_Sym *sym; 106 u8 *location; 107 u32 *loc32; 108 109 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 110 Elf64_Addr v; 111 112 /* This is where to make the change */ 113 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr 114 + rel[i].r_offset; 115 loc32 = (u32 *) location; 116 117 BUG_ON(((u64)location >> (u64)32) != (u64)0); 118 119 /* This is the symbol it is referring to. Note that all 120 undefined symbols have been resolved. */ 121 sym = (Elf64_Sym *)sechdrs[symindex].sh_addr 122 + ELF64_R_SYM(rel[i].r_info); 123 v = sym->st_value + rel[i].r_addend; 124 125 switch (ELF64_R_TYPE(rel[i].r_info) & 0xff) { 126 case R_SPARC_64: 127 location[0] = v >> 56; 128 location[1] = v >> 48; 129 location[2] = v >> 40; 130 location[3] = v >> 32; 131 location[4] = v >> 24; 132 location[5] = v >> 16; 133 location[6] = v >> 8; 134 location[7] = v >> 0; 135 break; 136 137 case R_SPARC_32: 138 location[0] = v >> 24; 139 location[1] = v >> 16; 140 location[2] = v >> 8; 141 location[3] = v >> 0; 142 break; 143 144 case R_SPARC_DISP32: 145 v -= (Elf64_Addr) location; 146 *loc32 = v; 147 break; 148 149 case R_SPARC_WDISP30: 150 v -= (Elf64_Addr) location; 151 *loc32 = (*loc32 & ~0x3fffffff) | 152 ((v >> 2) & 0x3fffffff); 153 break; 154 155 case R_SPARC_WDISP22: 156 v -= (Elf64_Addr) location; 157 *loc32 = (*loc32 & ~0x3fffff) | 158 ((v >> 2) & 0x3fffff); 159 break; 160 161 case R_SPARC_WDISP19: 162 v -= (Elf64_Addr) location; 163 *loc32 = (*loc32 & ~0x7ffff) | 164 ((v >> 2) & 0x7ffff); 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 case R_SPARC_OLO10: 177 *loc32 = (*loc32 & ~0x1fff) | 178 (((v & 0x3ff) + 179 (ELF64_R_TYPE(rel[i].r_info) >> 8)) 180 & 0x1fff); 181 break; 182 183 default: 184 printk(KERN_ERR "module %s: Unknown relocation: %x\n", 185 me->name, 186 (int) (ELF64_R_TYPE(rel[i].r_info) & 0xff)); 187 return -ENOEXEC; 188 }; 189 } 190 return 0; 191} 192 193int module_finalize(const Elf_Ehdr *hdr, 194 const Elf_Shdr *sechdrs, 195 struct module *me) 196{ 197 /* Cheetah's I-cache is fully coherent. */ 198 if (tlb_type == spitfire) { 199 unsigned long va; 200 201 flushw_all(); 202 for (va = 0; va < (PAGE_SIZE << 1); va += 32) 203 spitfire_put_icache_tag(va, 0x0); 204 __asm__ __volatile__("flush %g6"); 205 } 206 207 return 0; 208} 209 210void module_arch_cleanup(struct module *mod) 211{ 212} 213