1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* Kernel module help for powerpc. 3 Copyright (C) 2001, 2003 Rusty Russell IBM Corporation. 4 Copyright (C) 2008 Freescale Semiconductor, Inc. 5 6 */ 7 #include <linux/elf.h> 8 #include <linux/moduleloader.h> 9 #include <linux/err.h> 10 #include <linux/mm.h> 11 #include <linux/bug.h> 12 #include <asm/module.h> 13 #include <linux/uaccess.h> 14 #include <asm/firmware.h> 15 #include <linux/sort.h> 16 #include <asm/setup.h> 17 #include <asm/sections.h> 18 19 static const Elf_Shdr *find_section(const Elf_Ehdr *hdr, 20 const Elf_Shdr *sechdrs, 21 const char *name) 22 { 23 char *secstrings; 24 unsigned int i; 25 26 secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 27 for (i = 1; i < hdr->e_shnum; i++) 28 if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0) 29 return &sechdrs[i]; 30 return NULL; 31 } 32 33 int module_finalize(const Elf_Ehdr *hdr, 34 const Elf_Shdr *sechdrs, struct module *me) 35 { 36 const Elf_Shdr *sect; 37 int rc; 38 39 rc = module_finalize_ftrace(me, sechdrs); 40 if (rc) 41 return rc; 42 43 /* Apply feature fixups */ 44 sect = find_section(hdr, sechdrs, "__ftr_fixup"); 45 if (sect != NULL) 46 do_feature_fixups(cur_cpu_spec->cpu_features, 47 (void *)sect->sh_addr, 48 (void *)sect->sh_addr + sect->sh_size); 49 50 sect = find_section(hdr, sechdrs, "__mmu_ftr_fixup"); 51 if (sect != NULL) 52 do_feature_fixups(cur_cpu_spec->mmu_features, 53 (void *)sect->sh_addr, 54 (void *)sect->sh_addr + sect->sh_size); 55 56 #ifdef CONFIG_PPC64 57 sect = find_section(hdr, sechdrs, "__fw_ftr_fixup"); 58 if (sect != NULL) 59 do_feature_fixups(powerpc_firmware_features, 60 (void *)sect->sh_addr, 61 (void *)sect->sh_addr + sect->sh_size); 62 #endif /* CONFIG_PPC64 */ 63 64 #ifdef CONFIG_PPC64_ELF_ABI_V1 65 sect = find_section(hdr, sechdrs, ".opd"); 66 if (sect != NULL) { 67 me->arch.start_opd = sect->sh_addr; 68 me->arch.end_opd = sect->sh_addr + sect->sh_size; 69 } 70 #endif /* CONFIG_PPC64_ELF_ABI_V1 */ 71 72 #ifdef CONFIG_PPC_BARRIER_NOSPEC 73 sect = find_section(hdr, sechdrs, "__spec_barrier_fixup"); 74 if (sect != NULL) 75 do_barrier_nospec_fixups_range(barrier_nospec_enabled, 76 (void *)sect->sh_addr, 77 (void *)sect->sh_addr + sect->sh_size); 78 #endif /* CONFIG_PPC_BARRIER_NOSPEC */ 79 80 sect = find_section(hdr, sechdrs, "__lwsync_fixup"); 81 if (sect != NULL) 82 do_lwsync_fixups(cur_cpu_spec->cpu_features, 83 (void *)sect->sh_addr, 84 (void *)sect->sh_addr + sect->sh_size); 85 86 return 0; 87 } 88