89bc853eae
Find all ENDBR instructions which are never referenced and stick them in a section such that the kernel can poison them, sealing the functions from ever being an indirect call target. This removes about 1-in-4 ENDBR instructions. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lore.kernel.org/r/20220308154319.763643193@infradead.org
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2020 Matt Helsley <mhelsley@vmware.com>
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*/
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#ifndef _OBJTOOL_H
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#define _OBJTOOL_H
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#include <stdbool.h>
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#include <linux/list.h>
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#include <linux/hashtable.h>
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#include <objtool/elf.h>
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#define __weak __attribute__((weak))
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struct pv_state {
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bool clean;
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struct list_head targets;
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};
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struct objtool_file {
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struct elf *elf;
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struct list_head insn_list;
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DECLARE_HASHTABLE(insn_hash, 20);
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struct list_head retpoline_call_list;
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struct list_head static_call_list;
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struct list_head mcount_loc_list;
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struct list_head endbr_list;
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bool ignore_unreachables, c_file, hints, rodata;
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unsigned int nr_endbr;
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unsigned int nr_endbr_int;
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unsigned long jl_short, jl_long;
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unsigned long jl_nop_short, jl_nop_long;
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struct pv_state *pv_ops;
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};
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struct objtool_file *objtool_open_read(const char *_objname);
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void objtool_pv_add(struct objtool_file *file, int idx, struct symbol *func);
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int check(struct objtool_file *file);
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int orc_dump(const char *objname);
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int orc_create(struct objtool_file *file);
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#endif /* _OBJTOOL_H */
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