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| author | Mark Brown <broonie@kernel.org> | 2018-06-27 14:26:12 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2018-06-27 14:26:12 +0100 |
| commit | 1ce34dea91ae86bb18f493f72292df1bf6f66df7 (patch) | |
| tree | a9655fcdd65c2068cc04ffe3562a9c710dfa2145 /arch/x86/include/asm/insn.h | |
| parent | b0e4376b34cab1cbbd7ed399a1df787890336837 (diff) | |
| parent | a26899e0baa4de07caf97f5e4d7298240e98fd0e (diff) | |
Merge tag 'v4.14.52' into linux-linaro-lsk-v4.14lsk-v4.14-18.06
This is the 4.14.52 stable release
Diffstat (limited to 'arch/x86/include/asm/insn.h')
| -rw-r--r-- | arch/x86/include/asm/insn.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/include/asm/insn.h b/arch/x86/include/asm/insn.h index b3e32b010ab1..c2c01f84df75 100644 --- a/arch/x86/include/asm/insn.h +++ b/arch/x86/include/asm/insn.h @@ -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 */ |