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 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