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/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
19static 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
33int 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}