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 #include <linux/ctype.h> 14 15 void *module_alloc(unsigned long size) 16 { 17 void *ret; 18 19 /* We handle the zero case fine, unlike vmalloc */ 20 if (size == 0) 21 return NULL; 22 23 ret = vmalloc(size); 24 if (!ret) 25 ret = ERR_PTR(-ENOMEM); 26 else 27 memset(ret, 0, size); 28 29 return ret; 30 } 31 32 /* Free memory returned from module_core_alloc/module_init_alloc */ 33 void module_free(struct module *mod, void *module_region) 34 { 35 vfree(module_region); 36 /* FIXME: If module_region == mod->init_region, trim exception 37 table entries. */ 38 } 39 40 /* Make generic code ignore STT_REGISTER dummy undefined symbols, 41 * and replace references to .func with _Func 42 */ 43 int module_frob_arch_sections(Elf_Ehdr *hdr, 44 Elf_Shdr *sechdrs, 45 char *secstrings, 46 struct module *mod) 47 { 48 unsigned int symidx; 49 Elf32_Sym *sym; 50 char *strtab; 51 int i; 52 53 for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) { 54 if (symidx == hdr->e_shnum-1) { 55 printk("%s: no symtab found.\n", mod->name); 56 return -ENOEXEC; 57 } 58 } 59 sym = (Elf32_Sym *)sechdrs[symidx].sh_addr; 60 strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr; 61 62 for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) { 63 if (sym[i].st_shndx == SHN_UNDEF) { 64 if (ELF32_ST_TYPE(sym[i].st_info) == STT_REGISTER) 65 sym[i].st_shndx = SHN_ABS; 66 else { 67 char *name = strtab + sym[i].st_name; 68 if (name[0] == '.') { 69 name[0] = '_'; 70 name[1] = toupper(name[1]); 71 } 72 } 73 } 74 } 75 return 0; 76 } 77 78 int apply_relocate(Elf32_Shdr *sechdrs, 79 const char *strtab, 80 unsigned int symindex, 81 unsigned int relsec, 82 struct module *me) 83 { 84 printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n", 85 me->name); 86 return -ENOEXEC; 87 } 88 89 int apply_relocate_add(Elf32_Shdr *sechdrs, 90 const char *strtab, 91 unsigned int symindex, 92 unsigned int relsec, 93 struct module *me) 94 { 95 unsigned int i; 96 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; 97 Elf32_Sym *sym; 98 u8 *location; 99 u32 *loc32; 100 101 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 102 Elf32_Addr v; 103 104 /* This is where to make the change */ 105 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr 106 + rel[i].r_offset; 107 loc32 = (u32 *) location; 108 /* This is the symbol it is referring to. Note that all 109 undefined symbols have been resolved. */ 110 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr 111 + ELF32_R_SYM(rel[i].r_info); 112 v = sym->st_value + rel[i].r_addend; 113 114 switch (ELF32_R_TYPE(rel[i].r_info)) { 115 case R_SPARC_32: 116 case R_SPARC_UA32: 117 location[0] = v >> 24; 118 location[1] = v >> 16; 119 location[2] = v >> 8; 120 location[3] = v >> 0; 121 break; 122 123 case R_SPARC_WDISP30: 124 v -= (Elf32_Addr) location; 125 *loc32 = (*loc32 & ~0x3fffffff) | 126 ((v >> 2) & 0x3fffffff); 127 break; 128 129 case R_SPARC_WDISP22: 130 v -= (Elf32_Addr) location; 131 *loc32 = (*loc32 & ~0x3fffff) | 132 ((v >> 2) & 0x3fffff); 133 break; 134 135 case R_SPARC_LO10: 136 *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff); 137 break; 138 139 case R_SPARC_HI22: 140 *loc32 = (*loc32 & ~0x3fffff) | 141 ((v >> 10) & 0x3fffff); 142 break; 143 144 default: 145 printk(KERN_ERR "module %s: Unknown relocation: %x\n", 146 me->name, 147 (int) (ELF32_R_TYPE(rel[i].r_info) & 0xff)); 148 return -ENOEXEC; 149 }; 150 } 151 return 0; 152 } 153 154 int module_finalize(const Elf_Ehdr *hdr, 155 const Elf_Shdr *sechdrs, 156 struct module *me) 157 { 158 return 0; 159 } 160 161 void module_arch_cleanup(struct module *mod) 162 { 163 } 164