200994bc8f
Changes implementations of proc.Registers interface and the op.DwarfRegisters struct so that floating point registers can be loaded only when they are needed. Removes the floatingPoint parameter from proc.Thread.Registers. This accomplishes three things: 1. it simplifies the proc.Thread.Registers interface 2. it makes it impossible to accidentally create a broken set of saved registers or of op.DwarfRegisters by accidentally calling Registers(false) 3. it improves general performance of Delve by avoiding to load floating point registers as much as possible Floating point registers are loaded under two circumstances: 1. When the Slice method is called with floatingPoint == true 2. When the Copy method is called Benchmark before: BenchmarkConditionalBreakpoints-4 1 4327350142 ns/op Benchmark after: BenchmarkConditionalBreakpoints-4 1 3852642917 ns/op Updates #1549
90 lines
2.3 KiB
Go
90 lines
2.3 KiB
Go
package native
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import (
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"fmt"
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sys "golang.org/x/sys/unix"
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"github.com/go-delve/delve/pkg/proc"
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"github.com/go-delve/delve/pkg/proc/linutil"
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)
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// SetPC sets EIP to the value specified by 'pc'.
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func (thread *nativeThread) SetPC(pc uint64) error {
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ir, err := registers(thread)
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if err != nil {
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return err
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}
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r := ir.(*linutil.I386Registers)
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r.Regs.Eip = int32(pc)
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thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.ID, (*sys.PtraceRegs)(r.Regs)) })
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return err
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}
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// SetSP sets ESP to the value specified by 'sp'
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func (thread *nativeThread) SetSP(sp uint64) (err error) {
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var ir proc.Registers
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ir, err = registers(thread)
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if err != nil {
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return err
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}
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r := ir.(*linutil.I386Registers)
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r.Regs.Esp = int32(sp)
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thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.ID, (*sys.PtraceRegs)(r.Regs)) })
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return
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}
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func (thread *nativeThread) SetDX(dx uint64) (err error) {
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var ir proc.Registers
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ir, err = registers(thread)
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if err != nil {
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return err
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}
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r := ir.(*linutil.I386Registers)
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r.Regs.Edx = int32(dx)
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thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.ID, (*sys.PtraceRegs)(r.Regs)) })
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return
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}
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func registers(thread *nativeThread) (proc.Registers, error) {
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var (
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regs linutil.I386PtraceRegs
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err error
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)
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thread.dbp.execPtraceFunc(func() { err = sys.PtraceGetRegs(thread.ID, (*sys.PtraceRegs)(®s)) })
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if err != nil {
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return nil, err
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}
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r := linutil.NewI386Registers(®s, func(r *linutil.I386Registers) error {
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var fpregset linutil.I386Xstate
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var floatLoadError error
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r.Fpregs, fpregset, floatLoadError = thread.fpRegisters()
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r.Fpregset = &fpregset
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return floatLoadError
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})
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thread.dbp.execPtraceFunc(func() {
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tls, _ := ptraceGetTls(regs.Xgs, thread.ThreadID())
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r.Tls = uint64(tls)
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})
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return r, nil
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}
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const (
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_X86_XSTATE_MAX_SIZE = 2688
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_NT_X86_XSTATE = 0x202
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_XSAVE_HEADER_START = 512
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_XSAVE_HEADER_LEN = 64
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_XSAVE_EXTENDED_REGION_START = 576
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_XSAVE_SSE_REGION_LEN = 416
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)
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func (thread *nativeThread) fpRegisters() (regs []proc.Register, fpregs linutil.I386Xstate, err error) {
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thread.dbp.execPtraceFunc(func() { fpregs, err = ptraceGetRegset(thread.ID) })
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regs = fpregs.Decode()
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if err != nil {
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err = fmt.Errorf("could not get floating point registers: %v", err.Error())
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}
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return
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}
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