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 #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
73 int module_trampoline_target(struct module *mod, unsigned long trampoline,
74 unsigned long *target);
75 int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
76 #else
77 static 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 */
85
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