From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- arch/arm64/include/asm/module.h | 69 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 arch/arm64/include/asm/module.h (limited to 'arch/arm64/include/asm/module.h') diff --git a/arch/arm64/include/asm/module.h b/arch/arm64/include/asm/module.h new file mode 100644 index 0000000000..bfa6638b4c --- /dev/null +++ b/arch/arm64/include/asm/module.h @@ -0,0 +1,69 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2012 ARM Ltd. + */ +#ifndef __ASM_MODULE_H +#define __ASM_MODULE_H + +#include + +struct mod_plt_sec { + int plt_shndx; + int plt_num_entries; + int plt_max_entries; +}; + +struct mod_arch_specific { + struct mod_plt_sec core; + struct mod_plt_sec init; + + /* for CONFIG_DYNAMIC_FTRACE */ + struct plt_entry *ftrace_trampolines; +}; + +u64 module_emit_plt_entry(struct module *mod, Elf64_Shdr *sechdrs, + void *loc, const Elf64_Rela *rela, + Elf64_Sym *sym); + +u64 module_emit_veneer_for_adrp(struct module *mod, Elf64_Shdr *sechdrs, + void *loc, u64 val); + +struct plt_entry { + /* + * A program that conforms to the AArch64 Procedure Call Standard + * (AAPCS64) must assume that a veneer that alters IP0 (x16) and/or + * IP1 (x17) may be inserted at any branch instruction that is + * exposed to a relocation that supports long branches. Since that + * is exactly what we are dealing with here, we are free to use x16 + * as a scratch register in the PLT veneers. + */ + __le32 adrp; /* adrp x16, .... */ + __le32 add; /* add x16, x16, #0x.... */ + __le32 br; /* br x16 */ +}; + +static inline bool is_forbidden_offset_for_adrp(void *place) +{ + return IS_ENABLED(CONFIG_ARM64_ERRATUM_843419) && + cpus_have_const_cap(ARM64_WORKAROUND_843419) && + ((u64)place & 0xfff) >= 0xff8; +} + +struct plt_entry get_plt_entry(u64 dst, void *pc); + +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_MODULE_H */ -- cgit v1.2.3