Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
53/*
54 * Select ELF headers.
55 * Make empty sections for module_frob_arch_sections to expand.
56 */
57
58#ifdef __powerpc64__
59# ifdef MODULE
60 asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
61# ifdef CONFIG_PPC_KERNEL_PCREL
62 asm(".section .mygot,\"a\",@nobits; .align 3; .previous");
63# endif
64# endif
65#else
66# ifdef MODULE
67 asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
68 asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
69# endif /* MODULE */
70#endif
71
72#ifdef CONFIG_DYNAMIC_FTRACE
73int module_trampoline_target(struct module *mod, unsigned long trampoline,
74 unsigned long *target);
75int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
76#else
77static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
78{
79 return 0;
80}
81#endif
82
83#endif /* __KERNEL__ */
84#endif /* _ASM_POWERPC_MODULE_H */