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