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 /*
7 */
8
9 #include <linux/list.h>
10 #include <asm/bug.h>
11 #include <asm-generic/module.h>
12
13
14 #ifdef CONFIG_MPROFILE_KERNEL
15 #define MODULE_ARCH_VERMAGIC_FTRACE "mprofile-kernel "
16 #else
17 #define MODULE_ARCH_VERMAGIC_FTRACE ""
18 #endif
19
20 #ifdef CONFIG_RELOCATABLE
21 #define MODULE_ARCH_VERMAGIC_RELOCATABLE "relocatable "
22 #else
23 #define MODULE_ARCH_VERMAGIC_RELOCATABLE ""
24 #endif
25
26 #define MODULE_ARCH_VERMAGIC MODULE_ARCH_VERMAGIC_FTRACE MODULE_ARCH_VERMAGIC_RELOCATABLE
27
28 #ifndef __powerpc64__
29 /*
30 * Thanks to Paul M for explaining this.
31 *
32 * PPC can only do rel jumps += 32MB, and often the kernel and other
33 * modules are further away than this. So, we jump to a table of
34 * trampolines attached to the module (the Procedure Linkage Table)
35 * whenever that happens.
36 */
37
38 struct ppc_plt_entry {
39 /* 16 byte jump instruction sequence (4 instructions) */
40 unsigned int jump[4];
41 };
42 #endif /* __powerpc64__ */
43
44
45 struct mod_arch_specific {
46 #ifdef __powerpc64__
47 unsigned int stubs_section; /* Index of stubs section in module */
48 unsigned int toc_section; /* What section is the TOC? */
49 bool toc_fixed; /* Have we fixed up .TOC.? */
50
51 /* For module function descriptor dereference */
52 unsigned long start_opd;
53 unsigned long end_opd;
54 #else /* powerpc64 */
55 /* Indices of PLT sections within module. */
56 unsigned int core_plt_section;
57 unsigned int init_plt_section;
58 #endif /* powerpc64 */
59
60 #ifdef CONFIG_DYNAMIC_FTRACE
61 unsigned long tramp;
62 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
63 unsigned long tramp_regs;
64 #endif
65 #endif
66
67 /* List of BUG addresses, source line numbers and filenames */
68 struct list_head bug_list;
69 struct bug_entry *bug_table;
70 unsigned int num_bugs;
71 };
72
73 /*
74 * Select ELF headers.
75 * Make empty section for module_frob_arch_sections to expand.
76 */
77
78 #ifdef __powerpc64__
79 # ifdef MODULE
80 asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
81 # endif
82 #else
83 # ifdef MODULE
84 asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
85 asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
86 # endif /* MODULE */
87 #endif
88
89 #ifdef CONFIG_DYNAMIC_FTRACE
90 # ifdef MODULE
91 asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous");
92 # endif /* MODULE */
93 #endif
94
95 int module_trampoline_target(struct module *mod, unsigned long trampoline,
96 unsigned long *target);
97
98 #ifdef CONFIG_DYNAMIC_FTRACE
99 int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
100 #else
module_finalize_ftrace(struct module * mod,const Elf_Shdr * sechdrs)101 static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
102 {
103 return 0;
104 }
105 #endif
106
107 #endif /* __KERNEL__ */
108 #endif /* _ASM_POWERPC_MODULE_H */
109
