f3a191cd73
Implement debugging function for 386 on linux with reference to AMD64. There are a few remaining problems that need to be solved in another time. 1. The stacktrace of cgo are not exactly as expected. 2. Not implement `core` for now. 3. Not implement `call` for now. Can't not find `runtime·debugCallV1` or similar function in $GOROOT/src/runtime/asm_386.s. Update #20
45 lines
1.8 KiB
Go
45 lines
1.8 KiB
Go
// TODO: disassembler support should be compiled in unconditionally,
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// instead of being decided by the build-target architecture, and be
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// part of the Arch object instead.
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package proc
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import (
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"golang.org/x/arch/x86/x86asm"
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)
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// AsmDecode decodes the assembly instruction starting at mem[0:] into asmInst.
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// It assumes that the Loc and AtPC fields of asmInst have already been filled.
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func (a *AMD64) AsmDecode(asmInst *AsmInstruction, mem []byte, regs Registers, memrw MemoryReadWriter, bi *BinaryInfo) error {
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return x86AsmDecode(asmInst, mem, regs, memrw, bi, 64)
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}
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func (a *AMD64) Prologues() []opcodeSeq {
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return prologuesAMD64
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}
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// Possible stacksplit prologues are inserted by stacksplit in
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// $GOROOT/src/cmd/internal/obj/x86/obj6.go.
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// The stacksplit prologue will always begin with loading curg in CX, this
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// instruction is added by load_g_cx in the same file and is either 1 or 2
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// MOVs.
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var prologuesAMD64 []opcodeSeq
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func init() {
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var tinyStacksplit = opcodeSeq{uint64(x86asm.CMP), uint64(x86asm.JBE)}
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var smallStacksplit = opcodeSeq{uint64(x86asm.LEA), uint64(x86asm.CMP), uint64(x86asm.JBE)}
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var bigStacksplit = opcodeSeq{uint64(x86asm.MOV), uint64(x86asm.CMP), uint64(x86asm.JE), uint64(x86asm.LEA), uint64(x86asm.SUB), uint64(x86asm.CMP), uint64(x86asm.JBE)}
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var unixGetG = opcodeSeq{uint64(x86asm.MOV)}
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var windowsGetG = opcodeSeq{uint64(x86asm.MOV), uint64(x86asm.MOV)}
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prologuesAMD64 = make([]opcodeSeq, 0, 2*3)
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for _, getG := range []opcodeSeq{unixGetG, windowsGetG} {
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for _, stacksplit := range []opcodeSeq{tinyStacksplit, smallStacksplit, bigStacksplit} {
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prologue := make(opcodeSeq, 0, len(getG)+len(stacksplit))
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prologue = append(prologue, getG...)
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prologue = append(prologue, stacksplit...)
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prologuesAMD64 = append(prologuesAMD64, prologue)
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}
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}
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}
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