1 /* Kernel module help for powerpc. 2 Copyright (C) 2001, 2003 Rusty Russell IBM Corporation. 3 Copyright (C) 2008 Freescale Semiconductor, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 #include <linux/module.h> 20 #include <linux/elf.h> 21 #include <linux/moduleloader.h> 22 #include <linux/err.h> 23 #include <linux/vmalloc.h> 24 #include <linux/bug.h> 25 #include <asm/module.h> 26 #include <asm/uaccess.h> 27 #include <asm/firmware.h> 28 #include <linux/sort.h> 29 30 #include "setup.h" 31 32 LIST_HEAD(module_bug_list); 33 34 void *module_alloc(unsigned long size) 35 { 36 if (size == 0) 37 return NULL; 38 39 return vmalloc_exec(size); 40 } 41 42 /* Free memory returned from module_alloc */ 43 void module_free(struct module *mod, void *module_region) 44 { 45 vfree(module_region); 46 /* FIXME: If module_region == mod->init_region, trim exception 47 table entries. */ 48 } 49 50 static const Elf_Shdr *find_section(const Elf_Ehdr *hdr, 51 const Elf_Shdr *sechdrs, 52 const char *name) 53 { 54 char *secstrings; 55 unsigned int i; 56 57 secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 58 for (i = 1; i < hdr->e_shnum; i++) 59 if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0) 60 return &sechdrs[i]; 61 return NULL; 62 } 63 64 int module_finalize(const Elf_Ehdr *hdr, 65 const Elf_Shdr *sechdrs, struct module *me) 66 { 67 const Elf_Shdr *sect; 68 int err; 69 70 err = module_bug_finalize(hdr, sechdrs, me); 71 if (err) 72 return err; 73 74 /* Apply feature fixups */ 75 sect = find_section(hdr, sechdrs, "__ftr_fixup"); 76 if (sect != NULL) 77 do_feature_fixups(cur_cpu_spec->cpu_features, 78 (void *)sect->sh_addr, 79 (void *)sect->sh_addr + sect->sh_size); 80 81 sect = find_section(hdr, sechdrs, "__mmu_ftr_fixup"); 82 if (sect != NULL) 83 do_feature_fixups(cur_cpu_spec->mmu_features, 84 (void *)sect->sh_addr, 85 (void *)sect->sh_addr + sect->sh_size); 86 87 #ifdef CONFIG_PPC64 88 sect = find_section(hdr, sechdrs, "__fw_ftr_fixup"); 89 if (sect != NULL) 90 do_feature_fixups(powerpc_firmware_features, 91 (void *)sect->sh_addr, 92 (void *)sect->sh_addr + sect->sh_size); 93 #endif 94 95 sect = find_section(hdr, sechdrs, "__lwsync_fixup"); 96 if (sect != NULL) 97 do_lwsync_fixups(cur_cpu_spec->cpu_features, 98 (void *)sect->sh_addr, 99 (void *)sect->sh_addr + sect->sh_size); 100 101 return 0; 102 } 103 104 void module_arch_cleanup(struct module *mod) 105 { 106 module_bug_cleanup(mod); 107 } 108