Add optional LLVM BPF target support

BPF (eBPF) is an independent instruction set architecture which is
introduced in Linux a few years ago. Originally, eBPF execute
environment was only inside Linux kernel. However, recent years there
are some user space implementation (https://github.com/iovisor/ubpf,
https://doc.dpdk.org/guides/prog_guide/bpf_lib.html) and kernel space
implementation for FreeBSD is going on
(https://github.com/YutaroHayakawa/generic-ebpf).

The BPF target support can be enabled using WITH_LLVM_TARGET_BPF, as it
is not built by default.

Submitted by:	Yutaro Hayakawa <yhayakawa3720@gmail.com>
Reviewed by:	dim, bdrewery
Differential Revision: https://reviews.freebsd.org/D16033

lib/clang/include/llvm/Config/AsmParsers.def

@@ -10,6 +10,9 @@ LLVM_ASM_PARSER(AArch64)
 #ifdef LLVM_TARGET_ENABLE_ARM
 LLVM_ASM_PARSER(ARM)
 #endif
+#ifdef LLVM_TARGET_ENABLE_BPF
+LLVM_ASM_PARSER(BPF)
+#endif
 #ifdef LLVM_TARGET_ENABLE_MIPS
 LLVM_ASM_PARSER(Mips)
 #endif

lib/clang/include/llvm/Config/AsmPrinters.def

@@ -10,6 +10,9 @@ LLVM_ASM_PRINTER(AArch64)
 #ifdef LLVM_TARGET_ENABLE_ARM
 LLVM_ASM_PRINTER(ARM)
 #endif
+#ifdef LLVM_TARGET_ENABLE_BPF
+LLVM_ASM_PRINTER(BPF)
+#endif
 #ifdef LLVM_TARGET_ENABLE_MIPS
 LLVM_ASM_PRINTER(Mips)
 #endif

lib/clang/include/llvm/Config/Disassemblers.def

@@ -10,6 +10,9 @@ LLVM_DISASSEMBLER(AArch64)
 #ifdef LLVM_TARGET_ENABLE_ARM
 LLVM_DISASSEMBLER(ARM)
 #endif
+#ifdef LLVM_TARGET_ENABLE_BPF
+LLVM_DISASSEMBLER(BPF)
+#endif
 #ifdef LLVM_TARGET_ENABLE_MIPS
 LLVM_DISASSEMBLER(Mips)
 #endif

lib/clang/include/llvm/Config/Targets.def

@@ -10,6 +10,9 @@ LLVM_TARGET(AArch64)
 #ifdef LLVM_TARGET_ENABLE_ARM
 LLVM_TARGET(ARM)
 #endif
+#ifdef LLVM_TARGET_ENABLE_BPF
+LLVM_TARGET(BPF)
+#endif
 #ifdef LLVM_TARGET_ENABLE_MIPS
 LLVM_TARGET(Mips)
 #endif

lib/clang/libllvm/Makefile

@@ -9,14 +9,15 @@ INTERNALLIB=
 CFLAGS+=	-I${.OBJDIR}
 
 .if ${MK_LLVM_TARGET_AARCH64} == "no" && ${MK_LLVM_TARGET_ARM} == "no" && \
-    ${MK_LLVM_TARGET_MIPS} == "no" && ${MK_LLVM_TARGET_POWERPC} == "no" && \
-    ${MK_LLVM_TARGET_SPARC} == "no" && ${MK_LLVM_TARGET_X86} == "no"
+    ${MK_LLVM_TARGET_BPF} == "no" && ${MK_LLVM_TARGET_MIPS} == "no" && \
+    ${MK_LLVM_TARGET_POWERPC} == "no" && ${MK_LLVM_TARGET_SPARC} == "no" && \
+    ${MK_LLVM_TARGET_X86} == "no"
 .error Please enable at least one of: MK_LLVM_TARGET_AARCH64,\
- MK_LLVM_TARGET_ARM, MK_LLVM_TARGET_MIPS, MK_LLVM_TARGET_POWERPC,\
- MK_LLVM_TARGET_SPARC, or MK_LLVM_TARGET_X86
+ MK_LLVM_TARGET_ARM, MK_LLVM_TARGET_BPF, MK_LLVM_TARGET_MIPS, \
+ MK_LLVM_TARGET_POWERPC, MK_LLVM_TARGET_SPARC, or MK_LLVM_TARGET_X86
 .endif
 
-.for arch in AArch64 ARM Mips PowerPC Sparc X86
+.for arch in AArch64 ARM BPF Mips PowerPC Sparc X86
 . if ${MK_LLVM_TARGET_${arch:tu}} != "no"
 CFLAGS+=	-I${LLVM_SRCS}/lib/Target/${arch}
 . endif
@@ -905,6 +906,25 @@ SRCS_MIN+=	Target/ARM/Thumb2SizeReduction.cpp
 SRCS_MIN+=	Target/ARM/ThumbRegisterInfo.cpp
 SRCS_MIN+=	Target/ARM/Utils/ARMBaseInfo.cpp
 .endif # MK_LLVM_TARGET_ARM
+.if ${MK_LLVM_TARGET_BPF} != "no"
+SRCS_MIN+=	Target/BPF/AsmParser/BPFAsmParser.cpp
+SRCS_MIN+=	Target/BPF/BPFAsmPrinter.cpp
+SRCS_MIN+=	Target/BPF/BPFFrameLowering.cpp
+SRCS_MIN+=	Target/BPF/BPFISelDAGToDAG.cpp
+SRCS_MIN+=	Target/BPF/BPFISelLowering.cpp
+SRCS_MIN+=	Target/BPF/BPFInstrInfo.cpp
+SRCS_MIN+=	Target/BPF/BPFMCInstLower.cpp
+SRCS_MIN+=	Target/BPF/BPFRegisterInfo.cpp
+SRCS_MIN+=	Target/BPF/BPFSubtarget.cpp
+SRCS_MIN+=	Target/BPF/BPFTargetMachine.cpp
+SRCS_MIN+=	Target/BPF/Disassembler/BPFDisassembler.cpp
+SRCS_MIN+=	Target/BPF/InstPrinter/BPFInstPrinter.cpp
+SRCS_MIN+=	Target/BPF/MCTargetDesc/BPFAsmBackend.cpp
+SRCS_MIN+=	Target/BPF/MCTargetDesc/BPFELFObjectWriter.cpp
+SRCS_MIN+=	Target/BPF/MCTargetDesc/BPFMCCodeEmitter.cpp
+SRCS_MIN+=	Target/BPF/MCTargetDesc/BPFMCTargetDesc.cpp
+SRCS_MIN+=	Target/BPF/TargetInfo/BPFTargetInfo.cpp
+.endif # MK_LLVM_TARGET_BPF
 .if ${MK_LLVM_TARGET_MIPS} != "no"
 SRCS_MIN+=	Target/Mips/AsmParser/MipsAsmParser.cpp
 SRCS_XDW+=	Target/Mips/Disassembler/MipsDisassembler.cpp
@@ -1371,7 +1391,7 @@ beforebuild:
 
 # Note: some rules are superfluous, not every combination is valid.
 .for arch in \
-	AArch64/AArch64 ARM/ARM Mips/Mips PowerPC/PPC Sparc/Sparc X86/X86
+	AArch64/AArch64 ARM/ARM BPF/BPF Mips/Mips PowerPC/PPC Sparc/Sparc X86/X86
 . for hdr in \
 	AsmMatcher/-gen-asm-matcher \
 	AsmWriter1/-gen-asm-writer,-asmwriternum=1 \
@@ -1431,6 +1451,17 @@ TGHDRS+=	ARMGenRegisterInfo.inc
 TGHDRS+=	ARMGenSubtargetInfo.inc
 TGHDRS+=	ARMGenSystemRegister.inc
 .endif # MK_LLVM_TARGET_ARM
+.if ${MK_LLVM_TARGET_BPF} != "no"
+TGHDRS+=	BPFGenAsmMatcher.inc
+TGHDRS+=	BPFGenAsmWriter.inc
+TGHDRS+=	BPFGenCallingConv.inc
+TGHDRS+=	BPFGenDAGISel.inc
+TGHDRS+=	BPFGenDisassemblerTables.inc
+TGHDRS+=	BPFGenInstrInfo.inc
+TGHDRS+=	BPFGenMCCodeEmitter.inc
+TGHDRS+=	BPFGenRegisterInfo.inc
+TGHDRS+=	BPFGenSubtargetInfo.inc
+.endif # MK_LLVM_TARGET_BPF
 .if ${MK_LLVM_TARGET_MIPS} != "no"
 TGHDRS+=	MipsGenAsmMatcher.inc
 TGHDRS+=	MipsGenAsmWriter.inc

lib/clang/llvm.build.mk

@@ -54,6 +54,9 @@ CFLAGS+=	-DLLVM_TARGET_ENABLE_ARM
 LLVM_NATIVE_ARCH=	ARM
 . endif
 .endif
+.if ${MK_LLVM_TARGET_BPF} != "no"
+CFLAGS+=	-DLLVM_TARGET_ENABLE_BPF
+.endif
 .if ${MK_LLVM_TARGET_MIPS} != "no"
 CFLAGS+=	-DLLVM_TARGET_ENABLE_MIPS
 . if ${MACHINE_CPUARCH} == "mips"

share/man/man5/src.conf.5

@@ -1,6 +1,6 @@
 .\" DO NOT EDIT-- this file is @generated by tools/build/options/makeman.
 .\" $FreeBSD$
-.Dd August 2, 2018
+.Dd August 9, 2018
 .Dt SRC.CONF 5
 .Os
 .Sh NAME
@@ -1110,6 +1110,11 @@ option should be used rather than this in most cases.
 .Pp
 This is a default setting on
 amd64/amd64, arm/arm, arm/armv6, arm/armv7, arm64/aarch64, i386/i386, mips/mipsel, mips/mips, mips/mips64el, mips/mips64, mips/mipsn32, mips/mipselhf, mips/mipshf, mips/mips64elhf, mips/mips64hf, powerpc/powerpc, powerpc/powerpc64 and powerpc/powerpcspe.
+.It Va WITH_LLVM_TARGET_BPF
+Set to build LLVM target support for BPF.
+The
+.Va LLVM_TARGET_ALL
+option should be used rather than this in most cases.
 .It Va WITHOUT_LLVM_TARGET_MIPS
 Set to not build LLVM target support for MIPS.
 The

share/mk/src.opts.mk

@@ -275,6 +275,8 @@ __DEFAULT_DEPENDENT_OPTIONS+=	LLVM_TARGET_${__llt:${__LLVM_TARGET_FILT}:tu}/LLVM
 .endif
 .endfor
 
+__DEFAULT_NO_OPTIONS+=LLVM_TARGET_BPF
+
 .include <bsd.compiler.mk>
 # If the compiler is not C++11 capable, disable Clang and use GCC instead.
 # This means that architectures that have GCC 4.2 as default can not

tools/build/options/WITH_LLVM_TARGET_BPF

@@ -0,0 +1,5 @@
+.\" $FreeBSD$
+Set to build LLVM target support for BPF.
+The
+.Va LLVM_TARGET_ALL
+option should be used rather than this in most cases.