arch/powerpc/kernel/module.c

   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/vmalloc.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
  18 static LIST_HEAD(module_bug_list);
  19
  20 static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
  21                                     const Elf_Shdr *sechdrs,
  22                                     const char *name)
  23 {
  24         char *secstrings;
  25         unsigned int i;
  26
  27         secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
  28         for (i = 1; i < hdr->e_shnum; i++)
  29                 if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
  30                         return &sechdrs[i];
  31         return NULL;
  32 }
  33
  34 int module_finalize(const Elf_Ehdr *hdr,
  35                 const Elf_Shdr *sechdrs, struct module *me)
  36 {
  37         const Elf_Shdr *sect;
  38         int rc;
  39
  40         rc = module_finalize_ftrace(me, sechdrs);
  41         if (rc)
  42                 return rc;
  43
  44         /* Apply feature fixups */
  45         sect = find_section(hdr, sechdrs, "__ftr_fixup");
  46         if (sect != NULL)
  47                 do_feature_fixups(cur_cpu_spec->cpu_features,
  48                                   (void *)sect->sh_addr,
  49                                   (void *)sect->sh_addr + sect->sh_size);
  50
  51         sect = find_section(hdr, sechdrs, "__mmu_ftr_fixup");
  52         if (sect != NULL)
  53                 do_feature_fixups(cur_cpu_spec->mmu_features,
  54                                   (void *)sect->sh_addr,
  55                                   (void *)sect->sh_addr + sect->sh_size);
  56
  57 #ifdef CONFIG_PPC64
  58         sect = find_section(hdr, sechdrs, "__fw_ftr_fixup");
  59         if (sect != NULL)
  60                 do_feature_fixups(powerpc_firmware_features,
  61                                   (void *)sect->sh_addr,
  62                                   (void *)sect->sh_addr + sect->sh_size);
  63 #endif /* CONFIG_PPC64 */
  64
  65 #ifdef PPC64_ELF_ABI_v1
  66         sect = find_section(hdr, sechdrs, ".opd");
  67         if (sect != NULL) {
  68                 me->arch.start_opd = sect->sh_addr;
  69                 me->arch.end_opd = sect->sh_addr + sect->sh_size;
  70         }
  71 #endif /* PPC64_ELF_ABI_v1 */
  72
  73 #ifdef CONFIG_PPC_BARRIER_NOSPEC
  74         sect = find_section(hdr, sechdrs, "__spec_barrier_fixup");
  75         if (sect != NULL)
  76                 do_barrier_nospec_fixups_range(barrier_nospec_enabled,
  77                                   (void *)sect->sh_addr,
  78                                   (void *)sect->sh_addr + sect->sh_size);
  79 #endif /* CONFIG_PPC_BARRIER_NOSPEC */
  80
  81         sect = find_section(hdr, sechdrs, "__lwsync_fixup");
  82         if (sect != NULL)
  83                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
  84                                  (void *)sect->sh_addr,
  85                                  (void *)sect->sh_addr + sect->sh_size);
  86
  87         return 0;
  88 }
  89
  90 #ifdef MODULES_VADDR
  91 void *module_alloc(unsigned long size)
  92 {
  93         BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
  94
  95         return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, GFP_KERNEL,
  96                                     PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS, NUMA_NO_NODE,
  97                                     __builtin_return_address(0));
  98 }
  99 #endif