cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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module.h (1869B)

      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	Elf_Shdr *shdr;
     15	int num_entries;
     16	int max_entries;
     17};
     18
     19struct mod_arch_specific {
     20	struct mod_section plt;
     21	struct mod_section plt_idx;
     22};
     23
     24struct plt_entry {
     25	u32 inst_lu12iw;
     26	u32 inst_lu32id;
     27	u32 inst_lu52id;
     28	u32 inst_jirl;
     29};
     30
     31struct plt_idx_entry {
     32	unsigned long symbol_addr;
     33};
     34
     35Elf_Addr module_emit_plt_entry(struct module *mod, unsigned long val);
     36
     37static 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
     49static inline struct plt_idx_entry emit_plt_idx_entry(unsigned long val)
     50{
     51	return (struct plt_idx_entry) { val };
     52}
     53
     54static 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
     67static 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 */