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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_MODULE_H
#define _ASM_MODULE_H
#include <asm/inst.h>
#include <asm/orc_types.h>
#include <asm-generic/module.h>
#define RELA_STACK_DEPTH 16
struct mod_section {
int shndx;
int num_entries;
int max_entries;
};
struct mod_arch_specific {
struct mod_section got;
struct mod_section plt;
struct mod_section plt_idx;
#ifdef CONFIG_UNWINDER_ORC
unsigned int num_orcs;
int *orc_unwind_ip;
struct orc_entry *orc_unwind;
#endif
/* For CONFIG_DYNAMIC_FTRACE */
struct plt_entry *ftrace_trampolines;
};
struct got_entry {
Elf_Addr symbol_addr;
};
struct plt_entry {
u32 inst_lu12iw;
u32 inst_lu32id;
u32 inst_lu52id;
u32 inst_jirl;
};
struct plt_idx_entry {
Elf_Addr symbol_addr;
};
Elf_Addr module_emit_got_entry(struct module *mod, Elf_Shdr *sechdrs, Elf_Addr val);
Elf_Addr module_emit_plt_entry(struct module *mod, Elf_Shdr *sechdrs, Elf_Addr val);
static inline struct got_entry emit_got_entry(Elf_Addr val)
{
return (struct got_entry) { val };
}
static inline struct plt_entry emit_plt_entry(unsigned long val)
{
u32 lu12iw, lu32id, lu52id, jirl;
lu12iw = larch_insn_gen_lu12iw(LOONGARCH_GPR_T1, ADDR_IMM(val, LU12IW));
lu32id = larch_insn_gen_lu32id(LOONGARCH_GPR_T1, ADDR_IMM(val, LU32ID));
lu52id = larch_insn_gen_lu52id(LOONGARCH_GPR_T1, LOONGARCH_GPR_T1, ADDR_IMM(val, LU52ID));
jirl = larch_insn_gen_jirl(0, LOONGARCH_GPR_T1, ADDR_IMM(val, ORI));
return (struct plt_entry) { lu12iw, lu32id, lu52id, jirl };
}
static inline struct plt_idx_entry emit_plt_idx_entry(unsigned long val)
{
return (struct plt_idx_entry) { val };
}
static inline int get_plt_idx(unsigned long val, Elf_Shdr *sechdrs, const struct mod_section *sec)
{
int i;
struct plt_idx_entry *plt_idx = (struct plt_idx_entry *)sechdrs[sec->shndx].sh_addr;
for (i = 0; i < sec->num_entries; i++) {
if (plt_idx[i].symbol_addr == val)
return i;
}
return -1;
}
static inline struct plt_entry *get_plt_entry(unsigned long val,
Elf_Shdr *sechdrs,
const struct mod_section *sec_plt,
const struct mod_section *sec_plt_idx)
{
int plt_idx = get_plt_idx(val, sechdrs, sec_plt_idx);
struct plt_entry *plt = (struct plt_entry *)sechdrs[sec_plt->shndx].sh_addr;
if (plt_idx < 0)
return NULL;
return plt + plt_idx;
}
static inline struct got_entry *get_got_entry(Elf_Addr val,
Elf_Shdr *sechdrs,
const struct mod_section *sec)
{
int i;
struct got_entry *got = (struct got_entry *)sechdrs[sec->shndx].sh_addr;
for (i = 0; i < sec->num_entries; i++)
if (got[i].symbol_addr == val)
return &got[i];
return NULL;
}
#endif /* _ASM_MODULE_H */
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