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