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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_FTRACE "mprofile-kernel "
19#else
20#define MODULE_ARCH_VERMAGIC_FTRACE ""
21#endif
22
23#ifdef CONFIG_RELOCATABLE
24#define MODULE_ARCH_VERMAGIC_RELOCATABLE "relocatable "
25#else
26#define MODULE_ARCH_VERMAGIC_RELOCATABLE ""
27#endif
28
29#define MODULE_ARCH_VERMAGIC MODULE_ARCH_VERMAGIC_FTRACE MODULE_ARCH_VERMAGIC_RELOCATABLE
30
31#ifndef __powerpc64__
32/*
33 * Thanks to Paul M for explaining this.
34 *
35 * PPC can only do rel jumps += 32MB, and often the kernel and other
36 * modules are further away than this. So, we jump to a table of
37 * trampolines attached to the module (the Procedure Linkage Table)
38 * whenever that happens.
39 */
40
41struct ppc_plt_entry {
42 /* 16 byte jump instruction sequence (4 instructions) */
43 unsigned int jump[4];
44};
45#endif /* __powerpc64__ */
46
47
48struct mod_arch_specific {
49#ifdef __powerpc64__
50 unsigned int stubs_section; /* Index of stubs section in module */
51 unsigned int toc_section; /* What section is the TOC? */
52 bool toc_fixed; /* Have we fixed up .TOC.? */
53#ifdef CONFIG_DYNAMIC_FTRACE
54 unsigned long toc;
55 unsigned long tramp;
56#endif
57
58 /* For module function descriptor dereference */
59 unsigned long start_opd;
60 unsigned long end_opd;
61#else /* powerpc64 */
62 /* Indices of PLT sections within module. */
63 unsigned int core_plt_section;
64 unsigned int init_plt_section;
65#ifdef CONFIG_DYNAMIC_FTRACE
66 unsigned long tramp;
67#endif
68#endif /* powerpc64 */
69
70 /* List of BUG addresses, source line numbers and filenames */
71 struct list_head bug_list;
72 struct bug_entry *bug_table;
73 unsigned int num_bugs;
74};
75
76/*
77 * Select ELF headers.
78 * Make empty section for module_frob_arch_sections to expand.
79 */
80
81#ifdef __powerpc64__
82# ifdef MODULE
83 asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
84# endif
85#else
86# ifdef MODULE
87 asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
88 asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
89# endif /* MODULE */
90#endif
91
92#ifdef CONFIG_DYNAMIC_FTRACE
93# ifdef MODULE
94 asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous");
95# endif /* MODULE */
96#endif
97
98int module_trampoline_target(struct module *mod, unsigned long trampoline,
99 unsigned long *target);
100
101#ifdef CONFIG_DYNAMIC_FTRACE
102int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
103#else
104static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
105{
106 return 0;
107}
108#endif
109
110#endif /* __KERNEL__ */
111#endif /* _ASM_POWERPC_MODULE_H */