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
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