1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2#ifndef _ASM_POWERPC_MODULE_H
 3#define _ASM_POWERPC_MODULE_H
 4#ifdef __KERNEL__
 5
 6#include <linux/list.h>
 7#include <asm/bug.h>
 8#include <asm-generic/module.h>
 9
10#ifndef __powerpc64__
11/*
12 * Thanks to Paul M for explaining this.
13 *
14 * PPC can only do rel jumps += 32MB, and often the kernel and other
15 * modules are further away than this.  So, we jump to a table of
16 * trampolines attached to the module (the Procedure Linkage Table)
17 * whenever that happens.
18 */
19
20struct ppc_plt_entry {
21	/* 16 byte jump instruction sequence (4 instructions) */
22	unsigned int jump[4];
23};
24#endif	/* __powerpc64__ */
25
26
27struct mod_arch_specific {
28#ifdef __powerpc64__
29	unsigned int stubs_section;	/* Index of stubs section in module */
30#ifdef CONFIG_PPC_KERNEL_PCREL
31	unsigned int got_section;	/* What section is the GOT? */
32	unsigned int pcpu_section;	/* .data..percpu section */
33#else
34	unsigned int toc_section;	/* What section is the TOC? */
35	bool toc_fixed;			/* Have we fixed up .TOC.? */
36#endif
37
38	/* For module function descriptor dereference */
39	unsigned long start_opd;
40	unsigned long end_opd;
41#else /* powerpc64 */
42	/* Indices of PLT sections within module. */
43	unsigned int core_plt_section;
44	unsigned int init_plt_section;
45#endif /* powerpc64 */
46
47#ifdef CONFIG_DYNAMIC_FTRACE
48	unsigned long tramp;
49	unsigned long tramp_regs;
50#endif
51
52	/* List of BUG addresses, source line numbers and filenames */
53	struct list_head bug_list;
54	struct bug_entry *bug_table;
55	unsigned int num_bugs;
56};
57
58/*
59 * Select ELF headers.
60 * Make empty sections for module_frob_arch_sections to expand.
61 */
62
63#ifdef __powerpc64__
64#    ifdef MODULE
65	asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
66#        ifdef CONFIG_PPC_KERNEL_PCREL
67	    asm(".section .mygot,\"a\",@nobits; .align 3; .previous");
68#        endif
69#    endif
70#else
71#    ifdef MODULE
72	asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
73	asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
74#    endif	/* MODULE */
75#endif
76
77#ifdef CONFIG_DYNAMIC_FTRACE
78int module_trampoline_target(struct module *mod, unsigned long trampoline,
79			     unsigned long *target);
80int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
81#else
82static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
83{
84	return 0;
85}
86#endif
87
88#endif /* __KERNEL__ */
89#endif	/* _ASM_POWERPC_MODULE_H */