1 #ifndef _ASM_POWERPC_MODULE_H 2 #define _ASM_POWERPC_MODULE_H 3 #ifdef __KERNEL__ 4 5 /* 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/list.h> 13 #include <asm/bug.h> 14 #include <asm-generic/module.h> 15 16 17 #ifdef CONFIG_MPROFILE_KERNEL 18 #define MODULE_ARCH_VERMAGIC_FTRACE "mprofile-kernel " 19 #else 20 #define MODULE_ARCH_VERMAGIC_FTRACE "" 21 #endif 22 23 #ifdef CONFIG_RELOCATABLE 24 #define MODULE_ARCH_VERMAGIC_RELOCATABLE "relocatable " 25 #else 26 #define MODULE_ARCH_VERMAGIC_RELOCATABLE "" 27 #endif 28 29 #define MODULE_ARCH_VERMAGIC MODULE_ARCH_VERMAGIC_FTRACE MODULE_ARCH_VERMAGIC_RELOCATABLE 30 31 #ifndef __powerpc64__ 32 /* 33 * Thanks to Paul M for explaining this. 34 * 35 * PPC can only do rel jumps += 32MB, and often the kernel and other 36 * modules are further away than this. So, we jump to a table of 37 * trampolines attached to the module (the Procedure Linkage Table) 38 * whenever that happens. 39 */ 40 41 struct ppc_plt_entry { 42 /* 16 byte jump instruction sequence (4 instructions) */ 43 unsigned int jump[4]; 44 }; 45 #endif /* __powerpc64__ */ 46 47 48 struct mod_arch_specific { 49 #ifdef __powerpc64__ 50 unsigned int stubs_section; /* Index of stubs section in module */ 51 unsigned int toc_section; /* What section is the TOC? */ 52 bool toc_fixed; /* Have we fixed up .TOC.? */ 53 54 /* For module function descriptor dereference */ 55 unsigned long start_opd; 56 unsigned long end_opd; 57 #else /* powerpc64 */ 58 /* Indices of PLT sections within module. */ 59 unsigned int core_plt_section; 60 unsigned int init_plt_section; 61 #endif /* powerpc64 */ 62 63 #ifdef CONFIG_DYNAMIC_FTRACE 64 unsigned long tramp; 65 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS 66 unsigned long tramp_regs; 67 #endif 68 #endif 69 70 /* List of BUG addresses, source line numbers and filenames */ 71 struct list_head bug_list; 72 struct bug_entry *bug_table; 73 unsigned int num_bugs; 74 }; 75 76 /* 77 * Select ELF headers. 78 * Make empty section for module_frob_arch_sections to expand. 79 */ 80 81 #ifdef __powerpc64__ 82 # ifdef MODULE 83 asm(".section .stubs,\"ax\",@nobits; .align 3; .previous"); 84 # endif 85 #else 86 # ifdef MODULE 87 asm(".section .plt,\"ax\",@nobits; .align 3; .previous"); 88 asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous"); 89 # endif /* MODULE */ 90 #endif 91 92 #ifdef CONFIG_DYNAMIC_FTRACE 93 # ifdef MODULE 94 asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous"); 95 # endif /* MODULE */ 96 #endif 97 98 int module_trampoline_target(struct module *mod, unsigned long trampoline, 99 unsigned long *target); 100 101 #ifdef CONFIG_DYNAMIC_FTRACE 102 int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs); 103 #else 104 static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs) 105 { 106 return 0; 107 } 108 #endif 109 110 #endif /* __KERNEL__ */ 111 #endif /* _ASM_POWERPC_MODULE_H */ 112