1 /* Kernel module help for sparc32. 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 14 void *module_alloc(unsigned long size) 15 { 16 void *ret; 17 18 /* We handle the zero case fine, unlike vmalloc */ 19 if (size == 0) 20 return NULL; 21 22 ret = vmalloc(size); 23 if (!ret) 24 ret = ERR_PTR(-ENOMEM); 25 else 26 memset(ret, 0, size); 27 28 return ret; 29 } 30 31 /* Free memory returned from module_core_alloc/module_init_alloc */ 32 void module_free(struct module *mod, void *module_region) 33 { 34 vfree(module_region); 35 /* FIXME: If module_region == mod->init_region, trim exception 36 table entries. */ 37 } 38 39 /* Make generic code ignore STT_REGISTER dummy undefined symbols, 40 * and replace references to .func with func as in ppc64's dedotify. 41 */ 42 int module_frob_arch_sections(Elf_Ehdr *hdr, 43 Elf_Shdr *sechdrs, 44 char *secstrings, 45 struct module *mod) 46 { 47 unsigned int symidx; 48 Elf32_Sym *sym; 49 char *strtab; 50 int i; 51 52 for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) { 53 if (symidx == hdr->e_shnum-1) { 54 printk("%s: no symtab found.\n", mod->name); 55 return -ENOEXEC; 56 } 57 } 58 sym = (Elf32_Sym *)sechdrs[symidx].sh_addr; 59 strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr; 60 61 for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) { 62 if (sym[i].st_shndx == SHN_UNDEF) { 63 if (ELF32_ST_TYPE(sym[i].st_info) == STT_REGISTER) 64 sym[i].st_shndx = SHN_ABS; 65 else { 66 char *name = strtab + sym[i].st_name; 67 if (name[0] == '.') 68 memmove(name, name+1, strlen(name)); 69 } 70 } 71 } 72 return 0; 73 } 74 75 int apply_relocate(Elf32_Shdr *sechdrs, 76 const char *strtab, 77 unsigned int symindex, 78 unsigned int relsec, 79 struct module *me) 80 { 81 printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n", 82 me->name); 83 return -ENOEXEC; 84 } 85 86 int apply_relocate_add(Elf32_Shdr *sechdrs, 87 const char *strtab, 88 unsigned int symindex, 89 unsigned int relsec, 90 struct module *me) 91 { 92 unsigned int i; 93 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; 94 Elf32_Sym *sym; 95 u8 *location; 96 u32 *loc32; 97 98 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 99 Elf32_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 /* This is the symbol it is referring to. Note that all 106 undefined symbols have been resolved. */ 107 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr 108 + ELF32_R_SYM(rel[i].r_info); 109 v = sym->st_value + rel[i].r_addend; 110 111 switch (ELF32_R_TYPE(rel[i].r_info)) { 112 case R_SPARC_32: 113 location[0] = v >> 24; 114 location[1] = v >> 16; 115 location[2] = v >> 8; 116 location[3] = v >> 0; 117 break; 118 119 case R_SPARC_WDISP30: 120 v -= (Elf32_Addr) location; 121 *loc32 = (*loc32 & ~0x3fffffff) | 122 ((v >> 2) & 0x3fffffff); 123 break; 124 125 case R_SPARC_WDISP22: 126 v -= (Elf32_Addr) location; 127 *loc32 = (*loc32 & ~0x3fffff) | 128 ((v >> 2) & 0x3fffff); 129 break; 130 131 case R_SPARC_LO10: 132 *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff); 133 break; 134 135 case R_SPARC_HI22: 136 *loc32 = (*loc32 & ~0x3fffff) | 137 ((v >> 10) & 0x3fffff); 138 break; 139 140 default: 141 printk(KERN_ERR "module %s: Unknown relocation: %x\n", 142 me->name, 143 (int) (ELF32_R_TYPE(rel[i].r_info) & 0xff)); 144 return -ENOEXEC; 145 }; 146 } 147 return 0; 148 } 149 150 int module_finalize(const Elf_Ehdr *hdr, 151 const Elf_Shdr *sechdrs, 152 struct module *me) 153 { 154 return 0; 155 } 156 157 void module_arch_cleanup(struct module *mod) 158 { 159 } 160