LXR linux/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
  18static LIST_HEAD(module_bug_list);
  19
  20static 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
  34int 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
  91void *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
 100