/
amd64_disasm.go
38 lines (32 loc) · 1.54 KB
/
amd64_disasm.go
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// TODO: disassembler support should be compiled in unconditionally,
// instead of being decided by the build-target architecture, and be
// part of the Arch object instead.
package proc
import (
"golang.org/x/arch/x86/x86asm"
)
func amd64AsmDecode(asmInst *AsmInstruction, mem []byte, regs Registers, memrw MemoryReadWriter, bi *BinaryInfo) error {
return x86AsmDecode(asmInst, mem, regs, memrw, bi, 64)
}
// Possible stacksplit prologues are inserted by stacksplit in
// $GOROOT/src/cmd/internal/obj/x86/obj6.go.
// The stacksplit prologue will always begin with loading curg in CX, this
// instruction is added by load_g_cx in the same file and is either 1 or 2
// MOVs.
var prologuesAMD64 []opcodeSeq
func init() {
var tinyStacksplit = opcodeSeq{uint64(x86asm.CMP), uint64(x86asm.JBE)}
var smallStacksplit = opcodeSeq{uint64(x86asm.LEA), uint64(x86asm.CMP), uint64(x86asm.JBE)}
var bigStacksplit = opcodeSeq{uint64(x86asm.MOV), uint64(x86asm.CMP), uint64(x86asm.JE), uint64(x86asm.LEA), uint64(x86asm.SUB), uint64(x86asm.CMP), uint64(x86asm.JBE)}
var unixGetG = opcodeSeq{uint64(x86asm.MOV)}
var windowsGetG = opcodeSeq{uint64(x86asm.MOV), uint64(x86asm.MOV)}
prologuesAMD64 = make([]opcodeSeq, 0, 2*3)
for _, getG := range []opcodeSeq{unixGetG, windowsGetG} {
for _, stacksplit := range []opcodeSeq{tinyStacksplit, smallStacksplit, bigStacksplit} {
prologue := make(opcodeSeq, 0, len(getG)+len(stacksplit))
prologue = append(prologue, getG...)
prologue = append(prologue, stacksplit...)
prologuesAMD64 = append(prologuesAMD64, prologue)
}
}
}