3fb420f56c
Since commit 4e69ecf4da1e ("arm64/module: ftrace: deal with place
relative nature of PLTs"), plt_equals_entry() is not used outside of
module-plts.c, so make it static.
Signed-off-by: Li Huafei <lihuafei1@huawei.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20220929094134.99512-2-lihuafei1@huawei.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 ARM Ltd.
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*/
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#ifndef __ASM_MODULE_H
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#define __ASM_MODULE_H
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#include <asm-generic/module.h>
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#ifdef CONFIG_ARM64_MODULE_PLTS
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struct mod_plt_sec {
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int plt_shndx;
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int plt_num_entries;
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int plt_max_entries;
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};
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struct mod_arch_specific {
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struct mod_plt_sec core;
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struct mod_plt_sec init;
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/* for CONFIG_DYNAMIC_FTRACE */
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struct plt_entry *ftrace_trampolines;
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};
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#endif
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u64 module_emit_plt_entry(struct module *mod, Elf64_Shdr *sechdrs,
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void *loc, const Elf64_Rela *rela,
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Elf64_Sym *sym);
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u64 module_emit_veneer_for_adrp(struct module *mod, Elf64_Shdr *sechdrs,
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void *loc, u64 val);
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#ifdef CONFIG_RANDOMIZE_BASE
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extern u64 module_alloc_base;
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#else
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#define module_alloc_base ((u64)_etext - MODULES_VSIZE)
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#endif
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struct plt_entry {
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/*
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* A program that conforms to the AArch64 Procedure Call Standard
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* (AAPCS64) must assume that a veneer that alters IP0 (x16) and/or
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* IP1 (x17) may be inserted at any branch instruction that is
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* exposed to a relocation that supports long branches. Since that
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* is exactly what we are dealing with here, we are free to use x16
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* as a scratch register in the PLT veneers.
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*/
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__le32 adrp; /* adrp x16, .... */
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__le32 add; /* add x16, x16, #0x.... */
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__le32 br; /* br x16 */
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};
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static inline bool is_forbidden_offset_for_adrp(void *place)
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{
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return IS_ENABLED(CONFIG_ARM64_ERRATUM_843419) &&
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cpus_have_const_cap(ARM64_WORKAROUND_843419) &&
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((u64)place & 0xfff) >= 0xff8;
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}
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struct plt_entry get_plt_entry(u64 dst, void *pc);
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static inline bool plt_entry_is_initialized(const struct plt_entry *e)
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{
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return e->adrp || e->add || e->br;
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}
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#endif /* __ASM_MODULE_H */
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