Linux kernel mirror (for testing)
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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 unsigned int stub_count; /* Number of stubs used */
31#ifdef CONFIG_PPC_KERNEL_PCREL
32 unsigned int got_section; /* What section is the GOT? */
33 unsigned int pcpu_section; /* .data..percpu section */
34#else
35 unsigned int toc_section; /* What section is the TOC? */
36 bool toc_fixed; /* Have we fixed up .TOC.? */
37#endif
38
39#ifdef CONFIG_PPC64_ELF_ABI_V1
40 /* For module function descriptor dereference */
41 unsigned long start_opd;
42 unsigned long end_opd;
43#endif
44#else /* powerpc64 */
45 /* Indices of PLT sections within module. */
46 unsigned int core_plt_section;
47 unsigned int init_plt_section;
48#endif /* powerpc64 */
49
50#ifdef CONFIG_DYNAMIC_FTRACE
51 unsigned long tramp;
52 unsigned long tramp_regs;
53#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE
54 struct ftrace_ool_stub *ool_stubs;
55 unsigned int ool_stub_count;
56 unsigned int ool_stub_index;
57#endif
58#endif
59};
60
61/*
62 * Select ELF headers.
63 * Make empty sections for module_frob_arch_sections to expand.
64 */
65
66#ifdef __powerpc64__
67# ifdef MODULE
68 asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
69# ifdef CONFIG_PPC_KERNEL_PCREL
70 asm(".section .mygot,\"a\",@nobits; .align 3; .previous");
71# endif
72# endif
73#else
74# ifdef MODULE
75 asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
76 asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
77# endif /* MODULE */
78#endif
79
80#ifdef CONFIG_DYNAMIC_FTRACE
81int module_trampoline_target(struct module *mod, unsigned long trampoline,
82 unsigned long *target);
83int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
84#else
85static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
86{
87 return 0;
88}
89#endif
90
91#endif /* __KERNEL__ */
92#endif /* _ASM_POWERPC_MODULE_H */