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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#include <asm-generic/module.h>
15
16
17#ifdef CC_USING_MPROFILE_KERNEL
18#define MODULE_ARCH_VERMAGIC "mprofile-kernel"
19#endif
20
21#ifndef __powerpc64__
22/*
23 * Thanks to Paul M for explaining this.
24 *
25 * PPC can only do rel jumps += 32MB, and often the kernel and other
26 * modules are further away than this. So, we jump to a table of
27 * trampolines attached to the module (the Procedure Linkage Table)
28 * whenever that happens.
29 */
30
31struct ppc_plt_entry {
32 /* 16 byte jump instruction sequence (4 instructions) */
33 unsigned int jump[4];
34};
35#endif /* __powerpc64__ */
36
37
38struct mod_arch_specific {
39#ifdef __powerpc64__
40 unsigned int stubs_section; /* Index of stubs section in module */
41 unsigned int toc_section; /* What section is the TOC? */
42 bool toc_fixed; /* Have we fixed up .TOC.? */
43#ifdef CONFIG_DYNAMIC_FTRACE
44 unsigned long toc;
45 unsigned long tramp;
46#endif
47
48#else /* powerpc64 */
49 /* Indices of PLT sections within module. */
50 unsigned int core_plt_section;
51 unsigned int init_plt_section;
52#ifdef CONFIG_DYNAMIC_FTRACE
53 unsigned long tramp;
54#endif
55#endif /* powerpc64 */
56
57 /* List of BUG addresses, source line numbers and filenames */
58 struct list_head bug_list;
59 struct bug_entry *bug_table;
60 unsigned int num_bugs;
61};
62
63/*
64 * Select ELF headers.
65 * Make empty section for module_frob_arch_sections to expand.
66 */
67
68#ifdef __powerpc64__
69# ifdef MODULE
70 asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
71# endif
72#else
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
85int module_trampoline_target(struct module *mod, unsigned long trampoline,
86 unsigned long *target);
87
88#ifdef CONFIG_DYNAMIC_FTRACE
89int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
90#else
91static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
92{
93 return 0;
94}
95#endif
96
97#endif /* __KERNEL__ */
98#endif /* _ASM_POWERPC_MODULE_H */