From 14bb08c1df8db9ec6c8a05520d4eee67971235d9 Mon Sep 17 00:00:00 2001 From: Dimitri Sokolyuk Date: Thu, 27 Sep 2018 20:03:23 +0200 Subject: mod tidy --- vendor/golang.org/x/net/bpf/instructions.go | 704 ---------------------------- 1 file changed, 704 deletions(-) delete mode 100644 vendor/golang.org/x/net/bpf/instructions.go (limited to 'vendor/golang.org/x/net/bpf/instructions.go') diff --git a/vendor/golang.org/x/net/bpf/instructions.go b/vendor/golang.org/x/net/bpf/instructions.go deleted file mode 100644 index f9dc0e8..0000000 --- a/vendor/golang.org/x/net/bpf/instructions.go +++ /dev/null @@ -1,704 +0,0 @@ -// Copyright 2016 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package bpf - -import "fmt" - -// An Instruction is one instruction executed by the BPF virtual -// machine. -type Instruction interface { - // Assemble assembles the Instruction into a RawInstruction. - Assemble() (RawInstruction, error) -} - -// A RawInstruction is a raw BPF virtual machine instruction. -type RawInstruction struct { - // Operation to execute. - Op uint16 - // For conditional jump instructions, the number of instructions - // to skip if the condition is true/false. - Jt uint8 - Jf uint8 - // Constant parameter. The meaning depends on the Op. - K uint32 -} - -// Assemble implements the Instruction Assemble method. -func (ri RawInstruction) Assemble() (RawInstruction, error) { return ri, nil } - -// Disassemble parses ri into an Instruction and returns it. If ri is -// not recognized by this package, ri itself is returned. -func (ri RawInstruction) Disassemble() Instruction { - switch ri.Op & opMaskCls { - case opClsLoadA, opClsLoadX: - reg := Register(ri.Op & opMaskLoadDest) - sz := 0 - switch ri.Op & opMaskLoadWidth { - case opLoadWidth4: - sz = 4 - case opLoadWidth2: - sz = 2 - case opLoadWidth1: - sz = 1 - default: - return ri - } - switch ri.Op & opMaskLoadMode { - case opAddrModeImmediate: - if sz != 4 { - return ri - } - return LoadConstant{Dst: reg, Val: ri.K} - case opAddrModeScratch: - if sz != 4 || ri.K > 15 { - return ri - } - return LoadScratch{Dst: reg, N: int(ri.K)} - case opAddrModeAbsolute: - if ri.K > extOffset+0xffffffff { - return LoadExtension{Num: Extension(-extOffset + ri.K)} - } - return LoadAbsolute{Size: sz, Off: ri.K} - case opAddrModeIndirect: - return LoadIndirect{Size: sz, Off: ri.K} - case opAddrModePacketLen: - if sz != 4 { - return ri - } - return LoadExtension{Num: ExtLen} - case opAddrModeMemShift: - return LoadMemShift{Off: ri.K} - default: - return ri - } - - case opClsStoreA: - if ri.Op != opClsStoreA || ri.K > 15 { - return ri - } - return StoreScratch{Src: RegA, N: int(ri.K)} - - case opClsStoreX: - if ri.Op != opClsStoreX || ri.K > 15 { - return ri - } - return StoreScratch{Src: RegX, N: int(ri.K)} - - case opClsALU: - switch op := ALUOp(ri.Op & opMaskOperator); op { - case ALUOpAdd, ALUOpSub, ALUOpMul, ALUOpDiv, ALUOpOr, ALUOpAnd, ALUOpShiftLeft, ALUOpShiftRight, ALUOpMod, ALUOpXor: - if ri.Op&opMaskOperandSrc != 0 { - return ALUOpX{Op: op} - } - return ALUOpConstant{Op: op, Val: ri.K} - case aluOpNeg: - return NegateA{} - default: - return ri - } - - case opClsJump: - if ri.Op&opMaskJumpConst != opClsJump { - return ri - } - switch ri.Op & opMaskJumpCond { - case opJumpAlways: - return Jump{Skip: ri.K} - case opJumpEqual: - if ri.Jt == 0 { - return JumpIf{ - Cond: JumpNotEqual, - Val: ri.K, - SkipTrue: ri.Jf, - SkipFalse: 0, - } - } - return JumpIf{ - Cond: JumpEqual, - Val: ri.K, - SkipTrue: ri.Jt, - SkipFalse: ri.Jf, - } - case opJumpGT: - if ri.Jt == 0 { - return JumpIf{ - Cond: JumpLessOrEqual, - Val: ri.K, - SkipTrue: ri.Jf, - SkipFalse: 0, - } - } - return JumpIf{ - Cond: JumpGreaterThan, - Val: ri.K, - SkipTrue: ri.Jt, - SkipFalse: ri.Jf, - } - case opJumpGE: - if ri.Jt == 0 { - return JumpIf{ - Cond: JumpLessThan, - Val: ri.K, - SkipTrue: ri.Jf, - SkipFalse: 0, - } - } - return JumpIf{ - Cond: JumpGreaterOrEqual, - Val: ri.K, - SkipTrue: ri.Jt, - SkipFalse: ri.Jf, - } - case opJumpSet: - return JumpIf{ - Cond: JumpBitsSet, - Val: ri.K, - SkipTrue: ri.Jt, - SkipFalse: ri.Jf, - } - default: - return ri - } - - case opClsReturn: - switch ri.Op { - case opClsReturn | opRetSrcA: - return RetA{} - case opClsReturn | opRetSrcConstant: - return RetConstant{Val: ri.K} - default: - return ri - } - - case opClsMisc: - switch ri.Op { - case opClsMisc | opMiscTAX: - return TAX{} - case opClsMisc | opMiscTXA: - return TXA{} - default: - return ri - } - - default: - panic("unreachable") // switch is exhaustive on the bit pattern - } -} - -// LoadConstant loads Val into register Dst. -type LoadConstant struct { - Dst Register - Val uint32 -} - -// Assemble implements the Instruction Assemble method. -func (a LoadConstant) Assemble() (RawInstruction, error) { - return assembleLoad(a.Dst, 4, opAddrModeImmediate, a.Val) -} - -// String returns the instruction in assembler notation. -func (a LoadConstant) String() string { - switch a.Dst { - case RegA: - return fmt.Sprintf("ld #%d", a.Val) - case RegX: - return fmt.Sprintf("ldx #%d", a.Val) - default: - return fmt.Sprintf("unknown instruction: %#v", a) - } -} - -// LoadScratch loads scratch[N] into register Dst. -type LoadScratch struct { - Dst Register - N int // 0-15 -} - -// Assemble implements the Instruction Assemble method. -func (a LoadScratch) Assemble() (RawInstruction, error) { - if a.N < 0 || a.N > 15 { - return RawInstruction{}, fmt.Errorf("invalid scratch slot %d", a.N) - } - return assembleLoad(a.Dst, 4, opAddrModeScratch, uint32(a.N)) -} - -// String returns the instruction in assembler notation. -func (a LoadScratch) String() string { - switch a.Dst { - case RegA: - return fmt.Sprintf("ld M[%d]", a.N) - case RegX: - return fmt.Sprintf("ldx M[%d]", a.N) - default: - return fmt.Sprintf("unknown instruction: %#v", a) - } -} - -// LoadAbsolute loads packet[Off:Off+Size] as an integer value into -// register A. -type LoadAbsolute struct { - Off uint32 - Size int // 1, 2 or 4 -} - -// Assemble implements the Instruction Assemble method. -func (a LoadAbsolute) Assemble() (RawInstruction, error) { - return assembleLoad(RegA, a.Size, opAddrModeAbsolute, a.Off) -} - -// String returns the instruction in assembler notation. -func (a LoadAbsolute) String() string { - switch a.Size { - case 1: // byte - return fmt.Sprintf("ldb [%d]", a.Off) - case 2: // half word - return fmt.Sprintf("ldh [%d]", a.Off) - case 4: // word - if a.Off > extOffset+0xffffffff { - return LoadExtension{Num: Extension(a.Off + 0x1000)}.String() - } - return fmt.Sprintf("ld [%d]", a.Off) - default: - return fmt.Sprintf("unknown instruction: %#v", a) - } -} - -// LoadIndirect loads packet[X+Off:X+Off+Size] as an integer value -// into register A. -type LoadIndirect struct { - Off uint32 - Size int // 1, 2 or 4 -} - -// Assemble implements the Instruction Assemble method. -func (a LoadIndirect) Assemble() (RawInstruction, error) { - return assembleLoad(RegA, a.Size, opAddrModeIndirect, a.Off) -} - -// String returns the instruction in assembler notation. -func (a LoadIndirect) String() string { - switch a.Size { - case 1: // byte - return fmt.Sprintf("ldb [x + %d]", a.Off) - case 2: // half word - return fmt.Sprintf("ldh [x + %d]", a.Off) - case 4: // word - return fmt.Sprintf("ld [x + %d]", a.Off) - default: - return fmt.Sprintf("unknown instruction: %#v", a) - } -} - -// LoadMemShift multiplies the first 4 bits of the byte at packet[Off] -// by 4 and stores the result in register X. -// -// This instruction is mainly useful to load into X the length of an -// IPv4 packet header in a single instruction, rather than have to do -// the arithmetic on the header's first byte by hand. -type LoadMemShift struct { - Off uint32 -} - -// Assemble implements the Instruction Assemble method. -func (a LoadMemShift) Assemble() (RawInstruction, error) { - return assembleLoad(RegX, 1, opAddrModeMemShift, a.Off) -} - -// String returns the instruction in assembler notation. -func (a LoadMemShift) String() string { - return fmt.Sprintf("ldx 4*([%d]&0xf)", a.Off) -} - -// LoadExtension invokes a linux-specific extension and stores the -// result in register A. -type LoadExtension struct { - Num Extension -} - -// Assemble implements the Instruction Assemble method. -func (a LoadExtension) Assemble() (RawInstruction, error) { - if a.Num == ExtLen { - return assembleLoad(RegA, 4, opAddrModePacketLen, 0) - } - return assembleLoad(RegA, 4, opAddrModeAbsolute, uint32(extOffset+a.Num)) -} - -// String returns the instruction in assembler notation. -func (a LoadExtension) String() string { - switch a.Num { - case ExtLen: - return "ld #len" - case ExtProto: - return "ld #proto" - case ExtType: - return "ld #type" - case ExtPayloadOffset: - return "ld #poff" - case ExtInterfaceIndex: - return "ld #ifidx" - case ExtNetlinkAttr: - return "ld #nla" - case ExtNetlinkAttrNested: - return "ld #nlan" - case ExtMark: - return "ld #mark" - case ExtQueue: - return "ld #queue" - case ExtLinkLayerType: - return "ld #hatype" - case ExtRXHash: - return "ld #rxhash" - case ExtCPUID: - return "ld #cpu" - case ExtVLANTag: - return "ld #vlan_tci" - case ExtVLANTagPresent: - return "ld #vlan_avail" - case ExtVLANProto: - return "ld #vlan_tpid" - case ExtRand: - return "ld #rand" - default: - return fmt.Sprintf("unknown instruction: %#v", a) - } -} - -// StoreScratch stores register Src into scratch[N]. -type StoreScratch struct { - Src Register - N int // 0-15 -} - -// Assemble implements the Instruction Assemble method. -func (a StoreScratch) Assemble() (RawInstruction, error) { - if a.N < 0 || a.N > 15 { - return RawInstruction{}, fmt.Errorf("invalid scratch slot %d", a.N) - } - var op uint16 - switch a.Src { - case RegA: - op = opClsStoreA - case RegX: - op = opClsStoreX - default: - return RawInstruction{}, fmt.Errorf("invalid source register %v", a.Src) - } - - return RawInstruction{ - Op: op, - K: uint32(a.N), - }, nil -} - -// String returns the instruction in assembler notation. -func (a StoreScratch) String() string { - switch a.Src { - case RegA: - return fmt.Sprintf("st M[%d]", a.N) - case RegX: - return fmt.Sprintf("stx M[%d]", a.N) - default: - return fmt.Sprintf("unknown instruction: %#v", a) - } -} - -// ALUOpConstant executes A = A Val. -type ALUOpConstant struct { - Op ALUOp - Val uint32 -} - -// Assemble implements the Instruction Assemble method. -func (a ALUOpConstant) Assemble() (RawInstruction, error) { - return RawInstruction{ - Op: opClsALU | opALUSrcConstant | uint16(a.Op), - K: a.Val, - }, nil -} - -// String returns the instruction in assembler notation. -func (a ALUOpConstant) String() string { - switch a.Op { - case ALUOpAdd: - return fmt.Sprintf("add #%d", a.Val) - case ALUOpSub: - return fmt.Sprintf("sub #%d", a.Val) - case ALUOpMul: - return fmt.Sprintf("mul #%d", a.Val) - case ALUOpDiv: - return fmt.Sprintf("div #%d", a.Val) - case ALUOpMod: - return fmt.Sprintf("mod #%d", a.Val) - case ALUOpAnd: - return fmt.Sprintf("and #%d", a.Val) - case ALUOpOr: - return fmt.Sprintf("or #%d", a.Val) - case ALUOpXor: - return fmt.Sprintf("xor #%d", a.Val) - case ALUOpShiftLeft: - return fmt.Sprintf("lsh #%d", a.Val) - case ALUOpShiftRight: - return fmt.Sprintf("rsh #%d", a.Val) - default: - return fmt.Sprintf("unknown instruction: %#v", a) - } -} - -// ALUOpX executes A = A X -type ALUOpX struct { - Op ALUOp -} - -// Assemble implements the Instruction Assemble method. -func (a ALUOpX) Assemble() (RawInstruction, error) { - return RawInstruction{ - Op: opClsALU | opALUSrcX | uint16(a.Op), - }, nil -} - -// String returns the instruction in assembler notation. -func (a ALUOpX) String() string { - switch a.Op { - case ALUOpAdd: - return "add x" - case ALUOpSub: - return "sub x" - case ALUOpMul: - return "mul x" - case ALUOpDiv: - return "div x" - case ALUOpMod: - return "mod x" - case ALUOpAnd: - return "and x" - case ALUOpOr: - return "or x" - case ALUOpXor: - return "xor x" - case ALUOpShiftLeft: - return "lsh x" - case ALUOpShiftRight: - return "rsh x" - default: - return fmt.Sprintf("unknown instruction: %#v", a) - } -} - -// NegateA executes A = -A. -type NegateA struct{} - -// Assemble implements the Instruction Assemble method. -func (a NegateA) Assemble() (RawInstruction, error) { - return RawInstruction{ - Op: opClsALU | uint16(aluOpNeg), - }, nil -} - -// String returns the instruction in assembler notation. -func (a NegateA) String() string { - return fmt.Sprintf("neg") -} - -// Jump skips the following Skip instructions in the program. -type Jump struct { - Skip uint32 -} - -// Assemble implements the Instruction Assemble method. -func (a Jump) Assemble() (RawInstruction, error) { - return RawInstruction{ - Op: opClsJump | opJumpAlways, - K: a.Skip, - }, nil -} - -// String returns the instruction in assembler notation. -func (a Jump) String() string { - return fmt.Sprintf("ja %d", a.Skip) -} - -// JumpIf skips the following Skip instructions in the program if A -// Val is true. -type JumpIf struct { - Cond JumpTest - Val uint32 - SkipTrue uint8 - SkipFalse uint8 -} - -// Assemble implements the Instruction Assemble method. -func (a JumpIf) Assemble() (RawInstruction, error) { - var ( - cond uint16 - flip bool - ) - switch a.Cond { - case JumpEqual: - cond = opJumpEqual - case JumpNotEqual: - cond, flip = opJumpEqual, true - case JumpGreaterThan: - cond = opJumpGT - case JumpLessThan: - cond, flip = opJumpGE, true - case JumpGreaterOrEqual: - cond = opJumpGE - case JumpLessOrEqual: - cond, flip = opJumpGT, true - case JumpBitsSet: - cond = opJumpSet - case JumpBitsNotSet: - cond, flip = opJumpSet, true - default: - return RawInstruction{}, fmt.Errorf("unknown JumpTest %v", a.Cond) - } - jt, jf := a.SkipTrue, a.SkipFalse - if flip { - jt, jf = jf, jt - } - return RawInstruction{ - Op: opClsJump | cond, - Jt: jt, - Jf: jf, - K: a.Val, - }, nil -} - -// String returns the instruction in assembler notation. -func (a JumpIf) String() string { - switch a.Cond { - // K == A - case JumpEqual: - return conditionalJump(a, "jeq", "jneq") - // K != A - case JumpNotEqual: - return fmt.Sprintf("jneq #%d,%d", a.Val, a.SkipTrue) - // K > A - case JumpGreaterThan: - return conditionalJump(a, "jgt", "jle") - // K < A - case JumpLessThan: - return fmt.Sprintf("jlt #%d,%d", a.Val, a.SkipTrue) - // K >= A - case JumpGreaterOrEqual: - return conditionalJump(a, "jge", "jlt") - // K <= A - case JumpLessOrEqual: - return fmt.Sprintf("jle #%d,%d", a.Val, a.SkipTrue) - // K & A != 0 - case JumpBitsSet: - if a.SkipFalse > 0 { - return fmt.Sprintf("jset #%d,%d,%d", a.Val, a.SkipTrue, a.SkipFalse) - } - return fmt.Sprintf("jset #%d,%d", a.Val, a.SkipTrue) - // K & A == 0, there is no assembler instruction for JumpBitNotSet, use JumpBitSet and invert skips - case JumpBitsNotSet: - return JumpIf{Cond: JumpBitsSet, SkipTrue: a.SkipFalse, SkipFalse: a.SkipTrue, Val: a.Val}.String() - default: - return fmt.Sprintf("unknown instruction: %#v", a) - } -} - -func conditionalJump(inst JumpIf, positiveJump, negativeJump string) string { - if inst.SkipTrue > 0 { - if inst.SkipFalse > 0 { - return fmt.Sprintf("%s #%d,%d,%d", positiveJump, inst.Val, inst.SkipTrue, inst.SkipFalse) - } - return fmt.Sprintf("%s #%d,%d", positiveJump, inst.Val, inst.SkipTrue) - } - return fmt.Sprintf("%s #%d,%d", negativeJump, inst.Val, inst.SkipFalse) -} - -// RetA exits the BPF program, returning the value of register A. -type RetA struct{} - -// Assemble implements the Instruction Assemble method. -func (a RetA) Assemble() (RawInstruction, error) { - return RawInstruction{ - Op: opClsReturn | opRetSrcA, - }, nil -} - -// String returns the instruction in assembler notation. -func (a RetA) String() string { - return fmt.Sprintf("ret a") -} - -// RetConstant exits the BPF program, returning a constant value. -type RetConstant struct { - Val uint32 -} - -// Assemble implements the Instruction Assemble method. -func (a RetConstant) Assemble() (RawInstruction, error) { - return RawInstruction{ - Op: opClsReturn | opRetSrcConstant, - K: a.Val, - }, nil -} - -// String returns the instruction in assembler notation. -func (a RetConstant) String() string { - return fmt.Sprintf("ret #%d", a.Val) -} - -// TXA copies the value of register X to register A. -type TXA struct{} - -// Assemble implements the Instruction Assemble method. -func (a TXA) Assemble() (RawInstruction, error) { - return RawInstruction{ - Op: opClsMisc | opMiscTXA, - }, nil -} - -// String returns the instruction in assembler notation. -func (a TXA) String() string { - return fmt.Sprintf("txa") -} - -// TAX copies the value of register A to register X. -type TAX struct{} - -// Assemble implements the Instruction Assemble method. -func (a TAX) Assemble() (RawInstruction, error) { - return RawInstruction{ - Op: opClsMisc | opMiscTAX, - }, nil -} - -// String returns the instruction in assembler notation. -func (a TAX) String() string { - return fmt.Sprintf("tax") -} - -func assembleLoad(dst Register, loadSize int, mode uint16, k uint32) (RawInstruction, error) { - var ( - cls uint16 - sz uint16 - ) - switch dst { - case RegA: - cls = opClsLoadA - case RegX: - cls = opClsLoadX - default: - return RawInstruction{}, fmt.Errorf("invalid target register %v", dst) - } - switch loadSize { - case 1: - sz = opLoadWidth1 - case 2: - sz = opLoadWidth2 - case 4: - sz = opLoadWidth4 - default: - return RawInstruction{}, fmt.Errorf("invalid load byte length %d", sz) - } - return RawInstruction{ - Op: cls | sz | mode, - K: k, - }, nil -} -- cgit v1.2.3