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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 | // SPDX-License-Identifier: GPL-2.0-or-later /* Kernel module help for powerpc. Copyright (C) 2001, 2003 Rusty Russell IBM Corporation. Copyright (C) 2008 Freescale Semiconductor, Inc. */ #include <linux/elf.h> #include <linux/moduleloader.h> #include <linux/err.h> #include <linux/vmalloc.h> #include <linux/mm.h> #include <linux/bug.h> #include <asm/module.h> #include <linux/uaccess.h> #include <asm/firmware.h> #include <linux/sort.h> #include <asm/setup.h> #include <asm/sections.h> static LIST_HEAD(module_bug_list); static const Elf_Shdr *find_section(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, const char *name) { char *secstrings; unsigned int i; secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; for (i = 1; i < hdr->e_shnum; i++) if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0) return &sechdrs[i]; return NULL; } int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *me) { const Elf_Shdr *sect; int rc; rc = module_finalize_ftrace(me, sechdrs); if (rc) return rc; /* Apply feature fixups */ sect = find_section(hdr, sechdrs, "__ftr_fixup"); if (sect != NULL) do_feature_fixups(cur_cpu_spec->cpu_features, (void *)sect->sh_addr, (void *)sect->sh_addr + sect->sh_size); sect = find_section(hdr, sechdrs, "__mmu_ftr_fixup"); if (sect != NULL) do_feature_fixups(cur_cpu_spec->mmu_features, (void *)sect->sh_addr, (void *)sect->sh_addr + sect->sh_size); #ifdef CONFIG_PPC64 sect = find_section(hdr, sechdrs, "__fw_ftr_fixup"); if (sect != NULL) do_feature_fixups(powerpc_firmware_features, (void *)sect->sh_addr, (void *)sect->sh_addr + sect->sh_size); #endif /* CONFIG_PPC64 */ #ifdef CONFIG_PPC64_ELF_ABI_V1 sect = find_section(hdr, sechdrs, ".opd"); if (sect != NULL) { me->arch.start_opd = sect->sh_addr; me->arch.end_opd = sect->sh_addr + sect->sh_size; } #endif /* CONFIG_PPC64_ELF_ABI_V1 */ #ifdef CONFIG_PPC_BARRIER_NOSPEC sect = find_section(hdr, sechdrs, "__spec_barrier_fixup"); if (sect != NULL) do_barrier_nospec_fixups_range(barrier_nospec_enabled, (void *)sect->sh_addr, (void *)sect->sh_addr + sect->sh_size); #endif /* CONFIG_PPC_BARRIER_NOSPEC */ sect = find_section(hdr, sechdrs, "__lwsync_fixup"); if (sect != NULL) do_lwsync_fixups(cur_cpu_spec->cpu_features, (void *)sect->sh_addr, (void *)sect->sh_addr + sect->sh_size); return 0; } static __always_inline void * __module_alloc(unsigned long size, unsigned long start, unsigned long end, bool nowarn) { pgprot_t prot = strict_module_rwx_enabled() ? PAGE_KERNEL : PAGE_KERNEL_EXEC; gfp_t gfp = GFP_KERNEL | (nowarn ? __GFP_NOWARN : 0); /* * Don't do huge page allocations for modules yet until more testing * is done. STRICT_MODULE_RWX may require extra work to support this * too. */ return __vmalloc_node_range(size, 1, start, end, gfp, prot, VM_FLUSH_RESET_PERMS, NUMA_NO_NODE, __builtin_return_address(0)); } void *module_alloc(unsigned long size) { #ifdef MODULES_VADDR unsigned long limit = (unsigned long)_etext - SZ_32M; void *ptr = NULL; BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); /* First try within 32M limit from _etext to avoid branch trampolines */ if (MODULES_VADDR < PAGE_OFFSET && MODULES_END > limit) ptr = __module_alloc(size, limit, MODULES_END, true); if (!ptr) ptr = __module_alloc(size, MODULES_VADDR, MODULES_END, false); return ptr; #else return __module_alloc(size, VMALLOC_START, VMALLOC_END, false); #endif } |