diff options
Diffstat (limited to 'vendor/golang.org/x/arch/x86/x86asm/plan9x.go')
| -rw-r--r-- | vendor/golang.org/x/arch/x86/x86asm/plan9x.go | 362 |
1 files changed, 362 insertions, 0 deletions
diff --git a/vendor/golang.org/x/arch/x86/x86asm/plan9x.go b/vendor/golang.org/x/arch/x86/x86asm/plan9x.go new file mode 100644 index 00000000..41cfc08f --- /dev/null +++ b/vendor/golang.org/x/arch/x86/x86asm/plan9x.go @@ -0,0 +1,362 @@ +// Copyright 2014 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 x86asm + +import ( + "fmt" + "strings" +) + +// GoSyntax returns the Go assembler syntax for the instruction. +// The syntax was originally defined by Plan 9. +// The pc is the program counter of the instruction, used for expanding +// PC-relative addresses into absolute ones. +// The symname function queries the symbol table for the program +// being disassembled. Given a target address it returns the name and base +// address of the symbol containing the target, if any; otherwise it returns "", 0. +func GoSyntax(inst Inst, pc uint64, symname func(uint64) (string, uint64)) string { + if symname == nil { + symname = func(uint64) (string, uint64) { return "", 0 } + } + var args []string + for i := len(inst.Args) - 1; i >= 0; i-- { + a := inst.Args[i] + if a == nil { + continue + } + args = append(args, plan9Arg(&inst, pc, symname, a)) + } + + var rep string + var last Prefix + for _, p := range inst.Prefix { + if p == 0 || p.IsREX() || p.IsVEX() { + break + } + + switch { + // Don't show prefixes implied by the instruction text. + case p&0xFF00 == PrefixImplicit: + continue + // Only REP and REPN are recognized repeaters. Plan 9 syntax + // treats them as separate opcodes. + case p&0xFF == PrefixREP: + rep = "REP; " + case p&0xFF == PrefixREPN: + rep = "REPNE; " + default: + last = p + } + } + + prefix := "" + switch last & 0xFF { + case 0, 0x66, 0x67: + // ignore + default: + prefix += last.String() + " " + } + + op := inst.Op.String() + if plan9Suffix[inst.Op] { + s := inst.DataSize + if inst.MemBytes != 0 { + s = inst.MemBytes * 8 + } + switch s { + case 8: + op += "B" + case 16: + op += "W" + case 32: + op += "L" + case 64: + op += "Q" + } + } + + if args != nil { + op += " " + strings.Join(args, ", ") + } + + return rep + prefix + op +} + +func plan9Arg(inst *Inst, pc uint64, symname func(uint64) (string, uint64), arg Arg) string { + switch a := arg.(type) { + case Reg: + return plan9Reg[a] + case Rel: + if pc == 0 { + break + } + // If the absolute address is the start of a symbol, use the name. + // Otherwise use the raw address, so that things like relative + // jumps show up as JMP 0x123 instead of JMP f+10(SB). + // It is usually easier to search for 0x123 than to do the mental + // arithmetic to find f+10. + addr := pc + uint64(inst.Len) + uint64(a) + if s, base := symname(addr); s != "" && addr == base { + return fmt.Sprintf("%s(SB)", s) + } + return fmt.Sprintf("%#x", addr) + + case Imm: + if s, base := symname(uint64(a)); s != "" { + suffix := "" + if uint64(a) != base { + suffix = fmt.Sprintf("%+d", uint64(a)-base) + } + return fmt.Sprintf("$%s%s(SB)", s, suffix) + } + if inst.Mode == 32 { + return fmt.Sprintf("$%#x", uint32(a)) + } + if Imm(int32(a)) == a { + return fmt.Sprintf("$%#x", int64(a)) + } + return fmt.Sprintf("$%#x", uint64(a)) + case Mem: + if a.Segment == 0 && a.Disp != 0 && a.Base == 0 && (a.Index == 0 || a.Scale == 0) { + if s, base := symname(uint64(a.Disp)); s != "" { + suffix := "" + if uint64(a.Disp) != base { + suffix = fmt.Sprintf("%+d", uint64(a.Disp)-base) + } + return fmt.Sprintf("%s%s(SB)", s, suffix) + } + } + s := "" + if a.Segment != 0 { + s += fmt.Sprintf("%s:", plan9Reg[a.Segment]) + } + if a.Disp != 0 { + s += fmt.Sprintf("%#x", a.Disp) + } else { + s += "0" + } + if a.Base != 0 { + s += fmt.Sprintf("(%s)", plan9Reg[a.Base]) + } + if a.Index != 0 && a.Scale != 0 { + s += fmt.Sprintf("(%s*%d)", plan9Reg[a.Index], a.Scale) + } + return s + } + return arg.String() +} + +var plan9Suffix = [maxOp + 1]bool{ + ADC: true, + ADD: true, + AND: true, + BSF: true, + BSR: true, + BT: true, + BTC: true, + BTR: true, + BTS: true, + CMP: true, + CMPXCHG: true, + CVTSI2SD: true, + CVTSI2SS: true, + CVTSD2SI: true, + CVTSS2SI: true, + CVTTSD2SI: true, + CVTTSS2SI: true, + DEC: true, + DIV: true, + FLDENV: true, + FRSTOR: true, + IDIV: true, + IMUL: true, + IN: true, + INC: true, + LEA: true, + MOV: true, + MOVNTI: true, + MUL: true, + NEG: true, + NOP: true, + NOT: true, + OR: true, + OUT: true, + POP: true, + POPA: true, + PUSH: true, + PUSHA: true, + RCL: true, + RCR: true, + ROL: true, + ROR: true, + SAR: true, + SBB: true, + SHL: true, + SHLD: true, + SHR: true, + SHRD: true, + SUB: true, + TEST: true, + XADD: true, + XCHG: true, + XOR: true, +} + +var plan9Reg = [...]string{ + AL: "AL", + CL: "CL", + BL: "BL", + DL: "DL", + AH: "AH", + CH: "CH", + BH: "BH", + DH: "DH", + SPB: "SP", + BPB: "BP", + SIB: "SI", + DIB: "DI", + R8B: "R8", + R9B: "R9", + R10B: "R10", + R11B: "R11", + R12B: "R12", + R13B: "R13", + R14B: "R14", + R15B: "R15", + AX: "AX", + CX: "CX", + BX: "BX", + DX: "DX", + SP: "SP", + BP: "BP", + SI: "SI", + DI: "DI", + R8W: "R8", + R9W: "R9", + R10W: "R10", + R11W: "R11", + R12W: "R12", + R13W: "R13", + R14W: "R14", + R15W: "R15", + EAX: "AX", + ECX: "CX", + EDX: "DX", + EBX: "BX", + ESP: "SP", + EBP: "BP", + ESI: "SI", + EDI: "DI", + R8L: "R8", + R9L: "R9", + R10L: "R10", + R11L: "R11", + R12L: "R12", + R13L: "R13", + R14L: "R14", + R15L: "R15", + RAX: "AX", + RCX: "CX", + RDX: "DX", + RBX: "BX", + RSP: "SP", + RBP: "BP", + RSI: "SI", + RDI: "DI", + R8: "R8", + R9: "R9", + R10: "R10", + R11: "R11", + R12: "R12", + R13: "R13", + R14: "R14", + R15: "R15", + IP: "IP", + EIP: "IP", + RIP: "IP", + F0: "F0", + F1: "F1", + F2: "F2", + F3: "F3", + F4: "F4", + F5: "F5", + F6: "F6", + F7: "F7", + M0: "M0", + M1: "M1", + M2: "M2", + M3: "M3", + M4: "M4", + M5: "M5", + M6: "M6", + M7: "M7", + X0: "X0", + X1: "X1", + X2: "X2", + X3: "X3", + X4: "X4", + X5: "X5", + X6: "X6", + X7: "X7", + X8: "X8", + X9: "X9", + X10: "X10", + X11: "X11", + X12: "X12", + X13: "X13", + X14: "X14", + X15: "X15", + CS: "CS", + SS: "SS", + DS: "DS", + ES: "ES", + FS: "FS", + GS: "GS", + GDTR: "GDTR", + IDTR: "IDTR", + LDTR: "LDTR", + MSW: "MSW", + TASK: "TASK", + CR0: "CR0", + CR1: "CR1", + CR2: "CR2", + CR3: "CR3", + CR4: "CR4", + CR5: "CR5", + CR6: "CR6", + CR7: "CR7", + CR8: "CR8", + CR9: "CR9", + CR10: "CR10", + CR11: "CR11", + CR12: "CR12", + CR13: "CR13", + CR14: "CR14", + CR15: "CR15", + DR0: "DR0", + DR1: "DR1", + DR2: "DR2", + DR3: "DR3", + DR4: "DR4", + DR5: "DR5", + DR6: "DR6", + DR7: "DR7", + DR8: "DR8", + DR9: "DR9", + DR10: "DR10", + DR11: "DR11", + DR12: "DR12", + DR13: "DR13", + DR14: "DR14", + DR15: "DR15", + TR0: "TR0", + TR1: "TR1", + TR2: "TR2", + TR3: "TR3", + TR4: "TR4", + TR5: "TR5", + TR6: "TR6", + TR7: "TR7", +} |