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1bc276c3c4
JMP32 instructions has been added to eBPF ISA. They are 32-bit variants of existing BPF conditional jump instructions, but the comparison happens on low 32-bit sub-register only, therefore some unnecessary extensions could be saved. JMP32 instructions will only be available for -mcpu=v3. Host probe hook has been updated accordingly. JMP32 instructions will only be enabled in code-gen when -mattr=+alu32 enabled, meaning compiling the program using sub-register mode. For JMP32 encoding, it is a new instruction class, and is using the reserved eBPF class number 0x6. This patch has been tested by compiling and running kernel bpf selftests with JMP32 enabled. Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Jiong Wang <jiong.wang@netronome.com> llvm-svn: 353384
57 lines
1.6 KiB
TableGen
57 lines
1.6 KiB
TableGen
//===-- BPF.td - Describe the BPF Target Machine -----------*- tablegen -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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include "llvm/Target/Target.td"
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include "BPFRegisterInfo.td"
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include "BPFCallingConv.td"
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include "BPFInstrInfo.td"
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def BPFInstrInfo : InstrInfo;
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class Proc<string Name, list<SubtargetFeature> Features>
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: Processor<Name, NoItineraries, Features>;
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def : Proc<"generic", []>;
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def : Proc<"v1", []>;
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def : Proc<"v2", []>;
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def : Proc<"v3", []>;
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def : Proc<"probe", []>;
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def DummyFeature : SubtargetFeature<"dummy", "isDummyMode",
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"true", "unused feature">;
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def ALU32 : SubtargetFeature<"alu32", "HasAlu32", "true",
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"Enable ALU32 instructions">;
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def DwarfRIS: SubtargetFeature<"dwarfris", "UseDwarfRIS", "true",
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"Disable MCAsmInfo DwarfUsesRelocationsAcrossSections">;
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def BPFInstPrinter : AsmWriter {
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string AsmWriterClassName = "InstPrinter";
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bit isMCAsmWriter = 1;
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}
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def BPFAsmParser : AsmParser {
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bit HasMnemonicFirst = 0;
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}
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def BPFAsmParserVariant : AsmParserVariant {
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int Variant = 0;
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string Name = "BPF";
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string BreakCharacters = ".";
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string TokenizingCharacters = "#()[]=:.<>!+*";
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}
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def BPF : Target {
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let InstructionSet = BPFInstrInfo;
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let AssemblyWriters = [BPFInstPrinter];
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let AssemblyParsers = [BPFAsmParser];
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let AssemblyParserVariants = [BPFAsmParserVariant];
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}
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