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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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fe1042b1ef
INSN_CONTEXT_SWITCH is ambiguous. It can represent both call semantics (SYSCALL, SYSENTER) and return semantics (SYSRET, IRET, RETS, RETU). Those differ significantly: calls preserve control flow whereas returns terminate it. Objtool uses an arbitrary rule for INSN_CONTEXT_SWITCH that almost works by accident: if in a function, keep going; otherwise stop. It should instead be based on the semantics of the underlying instruction. In preparation for improving that, split INSN_CONTEXT_SWITCH into INSN_SYCALL and INSN_SYSRET. No functional change. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/19a76c74d2c051d3bc9a775823cafc65ad267a7a.1744095216.git.jpoimboe@kernel.org
105 lines
2.0 KiB
C
105 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
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*/
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#ifndef _ARCH_H
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#define _ARCH_H
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#include <stdbool.h>
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#include <linux/list.h>
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#include <objtool/objtool.h>
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#include <objtool/cfi.h>
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enum insn_type {
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INSN_JUMP_CONDITIONAL,
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INSN_JUMP_UNCONDITIONAL,
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INSN_JUMP_DYNAMIC,
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INSN_JUMP_DYNAMIC_CONDITIONAL,
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INSN_CALL,
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INSN_CALL_DYNAMIC,
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INSN_RETURN,
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INSN_SYSCALL,
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INSN_SYSRET,
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INSN_BUG,
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INSN_NOP,
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INSN_STAC,
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INSN_CLAC,
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INSN_STD,
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INSN_CLD,
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INSN_TRAP,
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INSN_ENDBR,
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INSN_LEA_RIP,
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INSN_OTHER,
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};
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enum op_dest_type {
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OP_DEST_REG,
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OP_DEST_REG_INDIRECT,
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OP_DEST_MEM,
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OP_DEST_PUSH,
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OP_DEST_PUSHF,
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};
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struct op_dest {
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enum op_dest_type type;
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unsigned char reg;
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int offset;
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};
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enum op_src_type {
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OP_SRC_REG,
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OP_SRC_REG_INDIRECT,
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OP_SRC_CONST,
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OP_SRC_POP,
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OP_SRC_POPF,
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OP_SRC_ADD,
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OP_SRC_AND,
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};
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struct op_src {
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enum op_src_type type;
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unsigned char reg;
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int offset;
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};
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struct stack_op {
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struct stack_op *next;
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struct op_dest dest;
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struct op_src src;
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};
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struct instruction;
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int arch_ftrace_match(char *name);
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void arch_initial_func_cfi_state(struct cfi_init_state *state);
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int arch_decode_instruction(struct objtool_file *file, const struct section *sec,
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unsigned long offset, unsigned int maxlen,
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struct instruction *insn);
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bool arch_callee_saved_reg(unsigned char reg);
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unsigned long arch_jump_destination(struct instruction *insn);
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unsigned long arch_dest_reloc_offset(int addend);
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const char *arch_nop_insn(int len);
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const char *arch_ret_insn(int len);
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int arch_decode_hint_reg(u8 sp_reg, int *base);
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bool arch_is_retpoline(struct symbol *sym);
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bool arch_is_rethunk(struct symbol *sym);
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bool arch_is_embedded_insn(struct symbol *sym);
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int arch_rewrite_retpolines(struct objtool_file *file);
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bool arch_pc_relative_reloc(struct reloc *reloc);
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unsigned int arch_reloc_size(struct reloc *reloc);
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unsigned long arch_jump_table_sym_offset(struct reloc *reloc, struct reloc *table);
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#endif /* _ARCH_H */
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