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1#ifndef _ASM_POWERPC_MODULE_H
2#define _ASM_POWERPC_MODULE_H
3#ifdef __KERNEL__
4
5/*
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/list.h>
13#include <asm/bug.h>
14
15
16#ifndef __powerpc64__
17/*
18 * Thanks to Paul M for explaining this.
19 *
20 * PPC can only do rel jumps += 32MB, and often the kernel and other
21 * modules are furthur away than this. So, we jump to a table of
22 * trampolines attached to the module (the Procedure Linkage Table)
23 * whenever that happens.
24 */
25
26struct ppc_plt_entry {
27 /* 16 byte jump instruction sequence (4 instructions) */
28 unsigned int jump[4];
29};
30#endif /* __powerpc64__ */
31
32
33struct mod_arch_specific {
34#ifdef __powerpc64__
35 unsigned int stubs_section; /* Index of stubs section in module */
36 unsigned int toc_section; /* What section is the TOC? */
37#ifdef CONFIG_DYNAMIC_FTRACE
38 unsigned long toc;
39 unsigned long tramp;
40#endif
41
42#else /* powerpc64 */
43 /* Indices of PLT sections within module. */
44 unsigned int core_plt_section;
45 unsigned int init_plt_section;
46#ifdef CONFIG_DYNAMIC_FTRACE
47 unsigned long tramp;
48#endif
49#endif /* powerpc64 */
50
51 /* List of BUG addresses, source line numbers and filenames */
52 struct list_head bug_list;
53 struct bug_entry *bug_table;
54 unsigned int num_bugs;
55};
56
57/*
58 * Select ELF headers.
59 * Make empty section for module_frob_arch_sections to expand.
60 */
61
62#ifdef __powerpc64__
63# define Elf_Shdr Elf64_Shdr
64# define Elf_Sym Elf64_Sym
65# define Elf_Ehdr Elf64_Ehdr
66# ifdef MODULE
67 asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
68# endif
69#else
70# define Elf_Shdr Elf32_Shdr
71# define Elf_Sym Elf32_Sym
72# define Elf_Ehdr Elf32_Ehdr
73# ifdef MODULE
74 asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
75 asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
76# endif /* MODULE */
77#endif
78
79#ifdef CONFIG_DYNAMIC_FTRACE
80# ifdef MODULE
81 asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous");
82# endif /* MODULE */
83#endif
84
85
86struct exception_table_entry;
87void sort_ex_table(struct exception_table_entry *start,
88 struct exception_table_entry *finish);
89
90#ifdef CONFIG_MODVERSIONS
91#define ARCH_RELOCATES_KCRCTAB
92
93extern const unsigned long reloc_start[];
94#endif
95#endif /* __KERNEL__ */
96#endif /* _ASM_POWERPC_MODULE_H */