1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 */ 5 #ifndef _ASM_MODULE_H 6 #define _ASM_MODULE_H 7 8 #include <asm/inst.h> 9 #include <asm/orc_types.h> 10 #include <asm-generic/module.h> 11 12 #define RELA_STACK_DEPTH 16 13 14 struct mod_section { 15 int shndx; 16 int num_entries; 17 int max_entries; 18 }; 19 20 struct mod_arch_specific { 21 struct mod_section got; 22 struct mod_section plt; 23 struct mod_section plt_idx; 24 25 #ifdef CONFIG_UNWINDER_ORC 26 unsigned int num_orcs; 27 int *orc_unwind_ip; 28 struct orc_entry *orc_unwind; 29 #endif 30 31 /* For CONFIG_DYNAMIC_FTRACE */ 32 struct plt_entry *ftrace_trampolines; 33 }; 34 35 struct got_entry { 36 Elf_Addr symbol_addr; 37 }; 38 39 struct plt_entry { 40 u32 inst_lu12iw; 41 u32 inst_lu32id; 42 u32 inst_lu52id; 43 u32 inst_jirl; 44 }; 45 46 struct plt_idx_entry { 47 Elf_Addr symbol_addr; 48 }; 49 50 Elf_Addr module_emit_got_entry(struct module *mod, Elf_Shdr *sechdrs, Elf_Addr val); 51 Elf_Addr module_emit_plt_entry(struct module *mod, Elf_Shdr *sechdrs, Elf_Addr val); 52 53 static inline struct got_entry emit_got_entry(Elf_Addr val) 54 { 55 return (struct got_entry) { val }; 56 } 57 58 static inline struct plt_entry emit_plt_entry(unsigned long val) 59 { 60 u32 lu12iw, lu32id, lu52id, jirl; 61 62 lu12iw = larch_insn_gen_lu12iw(LOONGARCH_GPR_T1, ADDR_IMM(val, LU12IW)); 63 lu32id = larch_insn_gen_lu32id(LOONGARCH_GPR_T1, ADDR_IMM(val, LU32ID)); 64 lu52id = larch_insn_gen_lu52id(LOONGARCH_GPR_T1, LOONGARCH_GPR_T1, ADDR_IMM(val, LU52ID)); 65 jirl = larch_insn_gen_jirl(0, LOONGARCH_GPR_T1, ADDR_IMM(val, ORI)); 66 67 return (struct plt_entry) { lu12iw, lu32id, lu52id, jirl }; 68 } 69 70 static inline struct plt_idx_entry emit_plt_idx_entry(unsigned long val) 71 { 72 return (struct plt_idx_entry) { val }; 73 } 74 75 static inline int get_plt_idx(unsigned long val, Elf_Shdr *sechdrs, const struct mod_section *sec) 76 { 77 int i; 78 struct plt_idx_entry *plt_idx = (struct plt_idx_entry *)sechdrs[sec->shndx].sh_addr; 79 80 for (i = 0; i < sec->num_entries; i++) { 81 if (plt_idx[i].symbol_addr == val) 82 return i; 83 } 84 85 return -1; 86 } 87 88 static inline struct plt_entry *get_plt_entry(unsigned long val, 89 Elf_Shdr *sechdrs, 90 const struct mod_section *sec_plt, 91 const struct mod_section *sec_plt_idx) 92 { 93 int plt_idx = get_plt_idx(val, sechdrs, sec_plt_idx); 94 struct plt_entry *plt = (struct plt_entry *)sechdrs[sec_plt->shndx].sh_addr; 95 96 if (plt_idx < 0) 97 return NULL; 98 99 return plt + plt_idx; 100 } 101 102 static inline struct got_entry *get_got_entry(Elf_Addr val, 103 Elf_Shdr *sechdrs, 104 const struct mod_section *sec) 105 { 106 int i; 107 struct got_entry *got = (struct got_entry *)sechdrs[sec->shndx].sh_addr; 108 109 for (i = 0; i < sec->num_entries; i++) 110 if (got[i].symbol_addr == val) 111 return &got[i]; 112 return NULL; 113 } 114 115 #endif /* _ASM_MODULE_H */ 116