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 stub_count; /* Number of stubs used */ 31 #ifdef CONFIG_PPC_KERNEL_PCREL 32 unsigned int got_section; /* What section is the GOT? */ 33 unsigned int pcpu_section; /* .data..percpu section */ 34 #else 35 unsigned int toc_section; /* What section is the TOC? */ 36 bool toc_fixed; /* Have we fixed up .TOC.? */ 37 #endif 38 39 #ifdef CONFIG_PPC64_ELF_ABI_V1 40 /* For module function descriptor dereference */ 41 unsigned long start_opd; 42 unsigned long end_opd; 43 #endif 44 #else /* powerpc64 */ 45 /* Indices of PLT sections within module. */ 46 unsigned int core_plt_section; 47 unsigned int init_plt_section; 48 #endif /* powerpc64 */ 49 50 #ifdef CONFIG_DYNAMIC_FTRACE 51 unsigned long tramp; 52 unsigned long tramp_regs; 53 #ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE 54 struct ftrace_ool_stub *ool_stubs; 55 unsigned int ool_stub_count; 56 unsigned int ool_stub_index; 57 #endif 58 #endif 59 }; 60 61 /* 62 * Select ELF headers. 63 * Make empty sections for module_frob_arch_sections to expand. 64 */ 65 66 #ifdef __powerpc64__ 67 # ifdef MODULE 68 asm(".section .stubs,\"ax\",@nobits; .align 3; .previous"); 69 # ifdef CONFIG_PPC_KERNEL_PCREL 70 asm(".section .mygot,\"a\",@nobits; .align 3; .previous"); 71 # endif 72 # endif 73 #else 74 # ifdef MODULE 75 asm(".section .plt,\"ax\",@nobits; .align 3; .previous"); 76 asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous"); 77 # endif /* MODULE */ 78 #endif 79 80 #ifdef CONFIG_DYNAMIC_FTRACE 81 int module_trampoline_target(struct module *mod, unsigned long trampoline, 82 unsigned long *target); 83 int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs); 84 #else 85 static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs) 86 { 87 return 0; 88 } 89 #endif 90 91 #endif /* __KERNEL__ */ 92 #endif /* _ASM_POWERPC_MODULE_H */ 93