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 /* List of BUG addresses, source line numbers and filenames */ 53 struct list_head bug_list; 54 struct bug_entry *bug_table; 55 unsigned int num_bugs; 56 }; 57 58 /* 59 * Select ELF headers. 60 * Make empty sections for module_frob_arch_sections to expand. 61 */ 62 63 #ifdef __powerpc64__ 64 # ifdef MODULE 65 asm(".section .stubs,\"ax\",@nobits; .align 3; .previous"); 66 # ifdef CONFIG_PPC_KERNEL_PCREL 67 asm(".section .mygot,\"a\",@nobits; .align 3; .previous"); 68 # endif 69 # endif 70 #else 71 # ifdef MODULE 72 asm(".section .plt,\"ax\",@nobits; .align 3; .previous"); 73 asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous"); 74 # endif /* MODULE */ 75 #endif 76 77 #ifdef CONFIG_DYNAMIC_FTRACE 78 # ifdef MODULE 79 asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous"); 80 # endif /* MODULE */ 81 82 int module_trampoline_target(struct module *mod, unsigned long trampoline, 83 unsigned long *target); 84 int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs); 85 #else 86 static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs) 87 { 88 return 0; 89 } 90 #endif 91 92 #endif /* __KERNEL__ */ 93 #endif /* _ASM_POWERPC_MODULE_H */ 94