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
13 struct mod_section {
14 Elf_Shdr *shdr;
15 int num_entries;
16 int max_entries;
17 };
18
19 struct mod_arch_specific {
20 struct mod_section plt;
21 struct mod_section plt_idx;
22 };
23
24 struct plt_entry {
25 u32 inst_lu12iw;
26 u32 inst_lu32id;
27 u32 inst_lu52id;
28 u32 inst_jirl;
29 };
30
31 struct plt_idx_entry {
32 unsigned long symbol_addr;
33 };
34
35 Elf_Addr module_emit_plt_entry(struct module *mod, unsigned long val);
36
emit_plt_entry(unsigned long val)37 static inline struct plt_entry emit_plt_entry(unsigned long val)
38 {
39 u32 lu12iw, lu32id, lu52id, jirl;
40
41 lu12iw = (lu12iw_op << 25 | (((val >> 12) & 0xfffff) << 5) | LOONGARCH_GPR_T1);
42 lu32id = larch_insn_gen_lu32id(LOONGARCH_GPR_T1, ADDR_IMM(val, LU32ID));
43 lu52id = larch_insn_gen_lu52id(LOONGARCH_GPR_T1, LOONGARCH_GPR_T1, ADDR_IMM(val, LU52ID));
44 jirl = larch_insn_gen_jirl(0, LOONGARCH_GPR_T1, 0, (val & 0xfff));
45
46 return (struct plt_entry) { lu12iw, lu32id, lu52id, jirl };
47 }
48
emit_plt_idx_entry(unsigned long val)49 static inline struct plt_idx_entry emit_plt_idx_entry(unsigned long val)
50 {
51 return (struct plt_idx_entry) { val };
52 }
53
get_plt_idx(unsigned long val,const struct mod_section * sec)54 static inline int get_plt_idx(unsigned long val, const struct mod_section *sec)
55 {
56 int i;
57 struct plt_idx_entry *plt_idx = (struct plt_idx_entry *)sec->shdr->sh_addr;
58
59 for (i = 0; i < sec->num_entries; i++) {
60 if (plt_idx[i].symbol_addr == val)
61 return i;
62 }
63
64 return -1;
65 }
66
get_plt_entry(unsigned long val,const struct mod_section * sec_plt,const struct mod_section * sec_plt_idx)67 static inline struct plt_entry *get_plt_entry(unsigned long val,
68 const struct mod_section *sec_plt,
69 const struct mod_section *sec_plt_idx)
70 {
71 int plt_idx = get_plt_idx(val, sec_plt_idx);
72 struct plt_entry *plt = (struct plt_entry *)sec_plt->shdr->sh_addr;
73
74 if (plt_idx < 0)
75 return NULL;
76
77 return plt + plt_idx;
78 }
79
80 #endif /* _ASM_MODULE_H */
81