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objtool, kprobes/x86: Sync the latest <asm/insn.h> header with tools/objtool/arch/x86/include/asm/insn.h

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  ee6a7354a3: kprobes/x86: Prohibit probing on exception masking instructions

Modified <asm/insn.h>, adding the insn_masking_exception() function.

Sync the tooling version of the header to it, to fix this warning:

  Warning: synced file at 'tools/objtool/arch/x86/include/asm/insn.h' differs from latest kernel version at 'arch/x86/include/asm/insn.h'

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Cc: Francis Deslauriers <francis.deslauriers@efficios.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Yonghong Song <yhs@fb.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "David S . Miller" <davem@davemloft.net>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2018-05-14 10:15:54 +02:00
parent b1ae32dbab
commit 4fe875e4bd
1 changed files with 18 additions and 0 deletions
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18
tools/objtool/arch/x86/include/asm/insn.h
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@ -208,4 +208,22 @@ static inline int insn_offset_immediate(struct insn *insn)
return insn_offset_displacement(insn) + insn->displacement.nbytes;
}
#define POP_SS_OPCODE 0x1f
#define MOV_SREG_OPCODE 0x8e
/*
* Intel SDM Vol.3A 6.8.3 states;
* "Any single-step trap that would be delivered following the MOV to SS
* instruction or POP to SS instruction (because EFLAGS.TF is 1) is
* suppressed."
* This function returns true if @insn is MOV SS or POP SS. On these
* instructions, single stepping is suppressed.
*/
static inline int insn_masking_exception(struct insn *insn)
{
return insn->opcode.bytes[0] == POP_SS_OPCODE ||
(insn->opcode.bytes[0] == MOV_SREG_OPCODE &&
X86_MODRM_REG(insn->modrm.bytes[0]) == 2);
}
#endif /* _ASM_X86_INSN_H */