This is a backport of a patch series for 5.4.x.
The patch series allows the x86 decoder to decode the Xen and KVM emulate prefixes.
In particular this solves the following issue that appeared when commit db6c6a0df840 ("objtool: Fix noreturn detection for ignored functions") was backported to 5.4.69:
arch/x86/xen/enlighten_pv.o: warning: objtool: xen_cpuid()+0x25: can't find jump dest instruction at .text+0x9c
Also now that this decoding is possible, also backport the commit which prevents kprobes on probing such prefixed instructions. This was also part of the original series.
The series applied mostly cleanly on 5.4.192 except for a contextual problem in the 3rd patch ("x86: xen: insn: Decode Xen and KVM emulate-prefix signature").
Masami Hiramatsu (4): x86/asm: Allow to pass macros to __ASM_FORM() x86: xen: kvm: Gather the definition of emulate prefixes x86: xen: insn: Decode Xen and KVM emulate-prefix signature x86: kprobes: Prohibit probing on instruction which has emulate prefix
arch/x86/include/asm/asm.h | 8 +++-- arch/x86/include/asm/emulate_prefix.h | 14 +++++++++ arch/x86/include/asm/insn.h | 6 ++++ arch/x86/include/asm/xen/interface.h | 11 +++---- arch/x86/kernel/kprobes/core.c | 4 +++ arch/x86/kvm/x86.c | 4 ++- arch/x86/lib/insn.c | 34 +++++++++++++++++++++ tools/arch/x86/include/asm/emulate_prefix.h | 14 +++++++++ tools/arch/x86/include/asm/insn.h | 6 ++++ tools/arch/x86/lib/insn.c | 34 +++++++++++++++++++++ tools/objtool/sync-check.sh | 3 +- tools/perf/check-headers.sh | 3 +- 12 files changed, 128 insertions(+), 13 deletions(-) create mode 100644 arch/x86/include/asm/emulate_prefix.h create mode 100644 tools/arch/x86/include/asm/emulate_prefix.h
base-commit: 1d72b776f6dc973211f5d153453cf8955fb3d70a