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| author | Dmitry Vyukov <dvyukov@google.com> | 2017-09-28 16:51:53 +0200 |
|---|---|---|
| committer | Dmitry Vyukov <dvyukov@google.com> | 2017-09-28 16:53:58 +0200 |
| commit | 8136bdad2fe7e71d4c395ef362adcbc6b0c02251 (patch) | |
| tree | 6900b569c3a60375339307a3d5c6d6be0242e6ea /vm/vmimpl/merger.go | |
| parent | a13111c7f3d400d2a9d0b84d0d777710b3696d29 (diff) | |
pkg/kd: add KD protocol decoder
Very primitive decoder that only decodes amd64 exceptions.
Use it in vm/gce. Now crashes contain something more or less
reasonable which is caught by manager as crash:
BUG: first chance exception 0x80000003
&kd.stateChange64{state:0x3030, processorLevel:0x6, processor:0x0,
numProcessors:0x2, thread:0xffff9c0bd015e080, pc:0xfffff8017615c380,
exception:kd.exception64{code:0x80000003, flags:0x0, record:0x0,
address:0xfffff8017615c380, numParams:0x1, unused:0x0, params:[15]uint64{
0x0, 0x40, 0xfffff801768699e0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0}, firstChance:0x1}, report:kd.controlReport{
dr6:0xffff0ff0, dr7:0x400, eflags:0x86, numInstr:0x10, reportFlags:0x3,
instr:[16]uint8{0xcc, 0xc3, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xf, 0x1f,
0x84, 0x0, 0x0, 0x0, 0x0, 0x0}, cs:0x10, ds:0x2b, es:0x2b, fs:0x53}}
Diffstat (limited to 'vm/vmimpl/merger.go')
| -rw-r--r-- | vm/vmimpl/merger.go | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/vm/vmimpl/merger.go b/vm/vmimpl/merger.go index 17b837602..b189a40f0 100644 --- a/vm/vmimpl/merger.go +++ b/vm/vmimpl/merger.go @@ -32,13 +32,27 @@ func (merger *OutputMerger) Wait() { } func (merger *OutputMerger) Add(name string, r io.ReadCloser) { + merger.AddDecoder(name, r, nil) +} + +func (merger *OutputMerger) AddDecoder(name string, r io.ReadCloser, + decoder func(data []byte) (start, size int, decoded []byte)) { merger.wg.Add(1) go func() { var pending []byte + var proto []byte var buf [4 << 10]byte for { n, err := r.Read(buf[:]) if n != 0 { + if decoder != nil { + proto = append(proto, buf[:n]...) + start, size, decoded := decoder(proto) + proto = proto[start+size:] + if len(decoded) != 0 { + merger.Output <- decoded // note: this can block + } + } pending = append(pending, buf[:n]...) if pos := bytes.LastIndexByte(pending, '\n'); pos != -1 { out := pending[:pos+1] |