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| 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 |
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