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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 
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 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
45 	unsigned long tramp_regs;
46 #endif
47 #endif
48 
49 	/* List of BUG addresses, source line numbers and filenames */
50 	struct list_head bug_list;
51 	struct bug_entry *bug_table;
52 	unsigned int num_bugs;
53 };
54 
55 /*
56  * Select ELF headers.
57  * Make empty section for module_frob_arch_sections to expand.
58  */
59 
60 #ifdef __powerpc64__
61 #    ifdef MODULE
62 	asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
63 #    endif
64 #else
65 #    ifdef MODULE
66 	asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
67 	asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
68 #    endif	/* MODULE */
69 #endif
70 
71 #ifdef CONFIG_DYNAMIC_FTRACE
72 #    ifdef MODULE
73 	asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous");
74 #    endif	/* MODULE */
75 
76 int module_trampoline_target(struct module *mod, unsigned long trampoline,
77 			     unsigned long *target);
78 int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
79 #else
module_finalize_ftrace(struct module * mod,const Elf_Shdr * sechdrs)80 static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
81 {
82 	return 0;
83 }
84 #endif
85 
86 #endif /* __KERNEL__ */
87 #endif	/* _ASM_POWERPC_MODULE_H */
88