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	u32 inst_lu32id;
 42	u32 inst_lu52id;
 43	u32 inst_jirl;
 44};
 45
 46struct plt_idx_entry {
 47	Elf_Addr symbol_addr;
 48};
 49
 50Elf_Addr module_emit_got_entry(struct module *mod, Elf_Shdr *sechdrs, Elf_Addr val);
 51Elf_Addr module_emit_plt_entry(struct module *mod, Elf_Shdr *sechdrs, Elf_Addr val);
 52
 53static inline struct got_entry emit_got_entry(Elf_Addr val)
 54{
 55	return (struct got_entry) { val };
 56}
 57
 58static 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
 70static inline struct plt_idx_entry emit_plt_idx_entry(unsigned long val)
 71{
 72	return (struct plt_idx_entry) { val };
 73}
 74
 75static 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
 88static 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
102static 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 */