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
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