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#ifndef __powerpc64__
18/*
19 * Thanks to Paul M for explaining this.
20 *
21 * PPC can only do rel jumps += 32MB, and often the kernel and other
22 * modules are furthur away than this.  So, we jump to a table of
23 * trampolines attached to the module (the Procedure Linkage Table)
24 * whenever that happens.
25 */
26
27struct ppc_plt_entry {
28	/* 16 byte jump instruction sequence (4 instructions) */
29	unsigned int jump[4];
30};
31#endif	/* __powerpc64__ */
32
33
34struct mod_arch_specific {
35#ifdef __powerpc64__
36	unsigned int stubs_section;	/* Index of stubs section in module */
37	unsigned int toc_section;	/* What section is the TOC? */
38	bool toc_fixed;			/* Have we fixed up .TOC.? */
39#ifdef CONFIG_DYNAMIC_FTRACE
40	unsigned long toc;
41	unsigned long tramp;
42#endif
43
44#else /* powerpc64 */
45	/* Indices of PLT sections within module. */
46	unsigned int core_plt_section;
47	unsigned int init_plt_section;
48#ifdef CONFIG_DYNAMIC_FTRACE
49	unsigned long tramp;
50#endif
51#endif /* powerpc64 */
52
53	/* List of BUG addresses, source line numbers and filenames */
54	struct list_head bug_list;
55	struct bug_entry *bug_table;
56	unsigned int num_bugs;
57};
58
59/*
60 * Select ELF headers.
61 * Make empty section for module_frob_arch_sections to expand.
62 */
63
64#ifdef __powerpc64__
65#    ifdef MODULE
66	asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
67#    endif
68#else
69#    ifdef MODULE
70	asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
71	asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
72#    endif	/* MODULE */
73#endif
74
75#ifdef CONFIG_DYNAMIC_FTRACE
76#    ifdef MODULE
77	asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous");
78#    endif	/* MODULE */
79#endif
80
81bool is_module_trampoline(u32 *insns);
82int module_trampoline_target(struct module *mod, u32 *trampoline,
83			     unsigned long *target);
84
85struct exception_table_entry;
86void sort_ex_table(struct exception_table_entry *start,
87		   struct exception_table_entry *finish);
88
89#if defined(CONFIG_MODVERSIONS) && defined(CONFIG_PPC64)
90#define ARCH_RELOCATES_KCRCTAB
91#define reloc_start PHYSICAL_START
92#endif
93#endif /* __KERNEL__ */
94#endif	/* _ASM_POWERPC_MODULE_H */
95