module.h (1810B)
1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Copyright (C) 2012 ARM Ltd. 4 */ 5#ifndef __ASM_MODULE_H 6#define __ASM_MODULE_H 7 8#include <asm-generic/module.h> 9 10#ifdef CONFIG_ARM64_MODULE_PLTS 11struct mod_plt_sec { 12 int plt_shndx; 13 int plt_num_entries; 14 int plt_max_entries; 15}; 16 17struct mod_arch_specific { 18 struct mod_plt_sec core; 19 struct mod_plt_sec init; 20 21 /* for CONFIG_DYNAMIC_FTRACE */ 22 struct plt_entry *ftrace_trampolines; 23}; 24#endif 25 26u64 module_emit_plt_entry(struct module *mod, Elf64_Shdr *sechdrs, 27 void *loc, const Elf64_Rela *rela, 28 Elf64_Sym *sym); 29 30u64 module_emit_veneer_for_adrp(struct module *mod, Elf64_Shdr *sechdrs, 31 void *loc, u64 val); 32 33#ifdef CONFIG_RANDOMIZE_BASE 34extern u64 module_alloc_base; 35#else 36#define module_alloc_base ((u64)_etext - MODULES_VSIZE) 37#endif 38 39struct plt_entry { 40 /* 41 * A program that conforms to the AArch64 Procedure Call Standard 42 * (AAPCS64) must assume that a veneer that alters IP0 (x16) and/or 43 * IP1 (x17) may be inserted at any branch instruction that is 44 * exposed to a relocation that supports long branches. Since that 45 * is exactly what we are dealing with here, we are free to use x16 46 * as a scratch register in the PLT veneers. 47 */ 48 __le32 adrp; /* adrp x16, .... */ 49 __le32 add; /* add x16, x16, #0x.... */ 50 __le32 br; /* br x16 */ 51}; 52 53static inline bool is_forbidden_offset_for_adrp(void *place) 54{ 55 return IS_ENABLED(CONFIG_ARM64_ERRATUM_843419) && 56 cpus_have_const_cap(ARM64_WORKAROUND_843419) && 57 ((u64)place & 0xfff) >= 0xff8; 58} 59 60struct plt_entry get_plt_entry(u64 dst, void *pc); 61bool plt_entries_equal(const struct plt_entry *a, const struct plt_entry *b); 62 63static inline bool plt_entry_is_initialized(const struct plt_entry *e) 64{ 65 return e->adrp || e->add || e->br; 66} 67 68#endif /* __ASM_MODULE_H */