7dcfcd46b9
Add the --mcount option for generating __mcount_loc sections needed for dynamic ftrace. Using this pass requires the kernel to be compiled with -mfentry and CC_USING_NOP_MCOUNT to be defined in Makefile. Bug: 145210207 Change-Id: I34eeeb00c184bf265391549094fc15525536886b Link: https://lore.kernel.org/lkml/20200625200235.GQ4781@hirez.programming.kicks-ass.net/ Signed-off-by: Peter Zijlstra <peterz@infradead.org> [Sami: rebased, dropped config changes, fixed to actually use --mcount, and wrote a commit message.] Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org>
71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
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*/
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#ifndef _CHECK_H
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#define _CHECK_H
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#include <stdbool.h>
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#include "cfi.h"
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#include "arch.h"
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struct insn_state {
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struct cfi_state cfi;
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unsigned int uaccess_stack;
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bool uaccess;
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bool df;
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bool noinstr;
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s8 instr;
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};
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struct instruction {
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struct list_head list;
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struct hlist_node hash;
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struct list_head static_call_node;
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struct list_head mcount_loc_node;
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struct section *sec;
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unsigned long offset;
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unsigned int len;
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enum insn_type type;
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unsigned long immediate;
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bool dead_end, ignore, ignore_alts;
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bool hint;
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bool retpoline_safe;
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s8 instr;
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u8 visited;
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u8 ret_offset;
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int alt_group;
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struct symbol *call_dest;
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struct instruction *jump_dest;
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struct instruction *first_jump_src;
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struct reloc *jump_table;
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struct list_head alts;
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struct symbol *func;
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struct list_head stack_ops;
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struct cfi_state cfi;
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#ifdef INSN_USE_ORC
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struct orc_entry orc;
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#endif
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};
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static inline bool is_static_jump(struct instruction *insn)
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{
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return insn->type == INSN_JUMP_CONDITIONAL ||
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insn->type == INSN_JUMP_UNCONDITIONAL;
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}
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struct instruction *find_insn(struct objtool_file *file,
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struct section *sec, unsigned long offset);
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#define for_each_insn(file, insn) \
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list_for_each_entry(insn, &file->insn_list, list)
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#define sec_for_each_insn(file, sec, insn) \
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for (insn = find_insn(file, sec, 0); \
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insn && &insn->list != &file->insn_list && \
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insn->sec == sec; \
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insn = list_next_entry(insn, list))
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#endif /* _CHECK_H */
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