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
20 struct ppc_plt_entry {
21 /* 16 byte jump instruction sequence (4 instructions) */
22 unsigned int jump[4];
23 };
24 #endif /* __powerpc64__ */
25
26
27 struct mod_arch_specific {
28 #ifdef __powerpc64__
29 unsigned int stubs_section; /* Index of stubs section in module */
30 unsigned int toc_section; /* What section is the TOC? */
31 bool toc_fixed; /* Have we fixed up .TOC.? */
32
33 /* For module function descriptor dereference */
34 unsigned long start_opd;
35 unsigned long end_opd;
36 #else /* powerpc64 */
37 /* Indices of PLT sections within module. */
38 unsigned int core_plt_section;
39 unsigned int init_plt_section;
40 #endif /* powerpc64 */
41
42 #ifdef CONFIG_DYNAMIC_FTRACE
43 unsigned long tramp;
44 unsigned long tramp_regs;
45 #endif
46
47 /* List of BUG addresses, source line numbers and filenames */
48 struct list_head bug_list;
49 struct bug_entry *bug_table;
50 unsigned int num_bugs;
51 };
52
53 /*
54 * Select ELF headers.
55 * Make empty section 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 # endif
62 #else
63 # ifdef MODULE
64 asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
65 asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
66 # endif /* MODULE */
67 #endif
68
69 #ifdef CONFIG_DYNAMIC_FTRACE
70 # ifdef MODULE
71 asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous");
72 # endif /* MODULE */
73
74 int module_trampoline_target(struct module *mod, unsigned long trampoline,
75 unsigned long *target);
76 int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
77 #else
module_finalize_ftrace(struct module * mod,const Elf_Shdr * sechdrs)78 static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
79 {
80 return 0;
81 }
82 #endif
83
84 #endif /* __KERNEL__ */
85 #endif /* _ASM_POWERPC_MODULE_H */
86