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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
14struct mod_section {
15 int shndx;
16 int num_entries;
17 int max_entries;
18};
19
20struct 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
35struct got_entry {
36 Elf_Addr symbol_addr;
37};
38
39struct plt_entry {
40 u32 inst_lu12iw;
41#ifdef CONFIG_64BIT
42 u32 inst_lu32id;
43 u32 inst_lu52id;
44#endif
45 u32 inst_jirl;
46};
47
48struct plt_idx_entry {
49 Elf_Addr symbol_addr;
50};
51
52Elf_Addr module_emit_got_entry(struct module *mod, Elf_Shdr *sechdrs, Elf_Addr val);
53Elf_Addr module_emit_plt_entry(struct module *mod, Elf_Shdr *sechdrs, Elf_Addr val);
54
55static inline struct got_entry emit_got_entry(Elf_Addr val)
56{
57 return (struct got_entry) { val };
58}
59
60static inline struct plt_entry emit_plt_entry(unsigned long val)
61{
62#ifdef CONFIG_32BIT
63 u32 lu12iw, jirl;
64
65 lu12iw = larch_insn_gen_lu12iw(LOONGARCH_GPR_T1, ADDR_IMM(val, LU12IW));
66 jirl = larch_insn_gen_jirl(0, LOONGARCH_GPR_T1, ADDR_IMM(val, ORI));
67
68 return (struct plt_entry) { lu12iw, jirl };
69#else
70 u32 lu12iw, lu32id, lu52id, jirl;
71
72 lu12iw = larch_insn_gen_lu12iw(LOONGARCH_GPR_T1, ADDR_IMM(val, LU12IW));
73 lu32id = larch_insn_gen_lu32id(LOONGARCH_GPR_T1, ADDR_IMM(val, LU32ID));
74 lu52id = larch_insn_gen_lu52id(LOONGARCH_GPR_T1, LOONGARCH_GPR_T1, ADDR_IMM(val, LU52ID));
75 jirl = larch_insn_gen_jirl(0, LOONGARCH_GPR_T1, ADDR_IMM(val, ORI));
76
77 return (struct plt_entry) { lu12iw, lu32id, lu52id, jirl };
78#endif
79}
80
81static inline struct plt_idx_entry emit_plt_idx_entry(unsigned long val)
82{
83 return (struct plt_idx_entry) { val };
84}
85
86static inline int get_plt_idx(unsigned long val, Elf_Shdr *sechdrs, const struct mod_section *sec)
87{
88 int i;
89 struct plt_idx_entry *plt_idx = (struct plt_idx_entry *)sechdrs[sec->shndx].sh_addr;
90
91 for (i = 0; i < sec->num_entries; i++) {
92 if (plt_idx[i].symbol_addr == val)
93 return i;
94 }
95
96 return -1;
97}
98
99static inline struct plt_entry *get_plt_entry(unsigned long val,
100 Elf_Shdr *sechdrs,
101 const struct mod_section *sec_plt,
102 const struct mod_section *sec_plt_idx)
103{
104 int plt_idx = get_plt_idx(val, sechdrs, sec_plt_idx);
105 struct plt_entry *plt = (struct plt_entry *)sechdrs[sec_plt->shndx].sh_addr;
106
107 if (plt_idx < 0)
108 return NULL;
109
110 return plt + plt_idx;
111}
112
113static inline struct got_entry *get_got_entry(Elf_Addr val,
114 Elf_Shdr *sechdrs,
115 const struct mod_section *sec)
116{
117 int i;
118 struct got_entry *got = (struct got_entry *)sechdrs[sec->shndx].sh_addr;
119
120 for (i = 0; i < sec->num_entries; i++)
121 if (got[i].symbol_addr == val)
122 return &got[i];
123 return NULL;
124}
125
126#endif /* _ASM_MODULE_H */