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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131/* SPDX-License-Identifier: GPL-2.0 *//* Copyright (C) 2017 Andes Technology Corporation */
#ifndef _ASM_RISCV_MODULE_H#define _ASM_RISCV_MODULE_H
#include <asm-generic/module.h>#include <linux/elf.h>
struct module;unsigned long module_emit_got_entry(struct module *mod, unsigned long val);unsigned long module_emit_plt_entry(struct module *mod, unsigned long val);
#ifdef CONFIG_MODULE_SECTIONSstruct mod_section { Elf_Shdr *shdr; int num_entries; int max_entries;};
struct mod_arch_specific { struct mod_section got; struct mod_section plt; struct mod_section got_plt;};
struct got_entry { unsigned long symbol_addr; /* the real variable address */};
static inline struct got_entry emit_got_entry(unsigned long val){ return (struct got_entry) {val};}
static inline struct got_entry *get_got_entry(unsigned long val, const struct mod_section *sec){ struct got_entry *got = (struct got_entry *)(sec->shdr->sh_addr); int i; for (i = 0; i < sec->num_entries; i++) { if (got[i].symbol_addr == val) return &got[i]; } return NULL;}
struct plt_entry { /* * Trampoline code to real target address. The return address * should be the original (pc+4) before entring plt entry. */ u32 insn_auipc; /* auipc t0, 0x0 */ u32 insn_ld; /* ld t1, 0x10(t0) */ u32 insn_jr; /* jr t1 */};
#define OPC_AUIPC 0x0017#define OPC_LD 0x3003#define OPC_JALR 0x0067#define REG_T0 0x5#define REG_T1 0x6
static inline struct plt_entry emit_plt_entry(unsigned long val, unsigned long plt, unsigned long got_plt){ /* * U-Type encoding: * +------------+----------+----------+ * | imm[31:12] | rd[11:7] | opc[6:0] | * +------------+----------+----------+ * * I-Type encoding: * +------------+------------+--------+----------+----------+ * | imm[31:20] | rs1[19:15] | funct3 | rd[11:7] | opc[6:0] | * +------------+------------+--------+----------+----------+ * */ unsigned long offset = got_plt - plt; u32 hi20 = (offset + 0x800) & 0xfffff000; u32 lo12 = (offset - hi20); return (struct plt_entry) { OPC_AUIPC | (REG_T0 << 7) | hi20, OPC_LD | (lo12 << 20) | (REG_T0 << 15) | (REG_T1 << 7), OPC_JALR | (REG_T1 << 15) };}
static inline int get_got_plt_idx(unsigned long val, const struct mod_section *sec){ struct got_entry *got_plt = (struct got_entry *)sec->shdr->sh_addr; int i; for (i = 0; i < sec->num_entries; i++) { if (got_plt[i].symbol_addr == val) return i; } return -1;}
static inline struct plt_entry *get_plt_entry(unsigned long val, const struct mod_section *sec_plt, const struct mod_section *sec_got_plt){ struct plt_entry *plt = (struct plt_entry *)sec_plt->shdr->sh_addr; int got_plt_idx = get_got_plt_idx(val, sec_got_plt); if (got_plt_idx >= 0) return plt + got_plt_idx; else return NULL;}
#endif /* CONFIG_MODULE_SECTIONS */
static inline const Elf_Shdr *find_section(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, const char *name){ const Elf_Shdr *s, *se; const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++) { if (strcmp(name, secstrs + s->sh_name) == 0) return s; }
return NULL;}
#endif /* _ASM_RISCV_MODULE_H */