-
Notifications
You must be signed in to change notification settings - Fork 1
/
bininfo.go
585 lines (527 loc) · 14.6 KB
/
bininfo.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
package main
import (
"bytes"
"compress/zlib"
"debug/dwarf"
"debug/elf"
"encoding/binary"
"errors"
"fmt"
"go.uber.org/zap"
"golang.org/x/arch/x86/x86asm"
"io"
"strconv"
"strings"
"syscall"
)
type CompileUnit struct {
functions []*Function
}
type Function struct {
name string
lowpc uint64
highpc uint64
frameBase []byte
declFile int64
external bool
variables []*dwarf.Entry
cu *CompileUnit
}
type BI struct {
Sources map[string]map[int][]*dwarf.LineEntry
Functions []*Function
CompileUnits []*CompileUnit
FramesInformation []*VirtualUnwindFrameInformation
}
func analyze(execfile string) (*BI, error) {
var (
elffile *elf.File
err error
dwarfData *dwarf.Data
bi *BI
)
if elffile, err = elf.Open(execfile); err != nil {
return nil, err
}
defer elffile.Close()
// just check
if _, err = openInfoSection(elffile); err != nil {
return nil, err
}
if _, err = openLineSection(elffile); err != nil {
return nil, err
}
// parse
bi = &BI{Sources: make(map[string]map[int][]*dwarf.LineEntry)}
if dwarfData, err = elffile.DWARF(); err != nil {
return nil, err
}
if err = bi.ParseLineAndInfoSection(dwarfData); err != nil {
return nil, err
}
if err = bi.ParseFrameSection(elffile); err != nil {
return nil, err
}
// debug source log
for file, mp := range bi.Sources {
for line, lineEntryArray := range mp {
for _, lineEntry := range lineEntryArray {
logger.Debug("bi.sources",
zap.String("file", file), zap.Int("line", line), zap.Uint64("addr", lineEntry.Address))
}
}
}
// debug frame log
for i, v := range bi.FramesInformation {
if v.CIE != nil {
logger.Debug("bi.frames", zap.Int("index", i), zap.String("cie", v.CIE.String()))
} else if v.FDE != nil {
logger.Debug("bi.frames", zap.Int("index", i), zap.String("fde", v.FDE.String()))
} else {
logger.Error("find frame both cie/pde == nil")
}
}
return bi, nil
}
func openInfoSection(elffile *elf.File) ([]byte, error) {
var (
debugInfoBytes []byte
err error
)
infoSection := elffile.Section(".debug_info")
if infoSection == nil {
infoSection = elffile.Section(".zdebug_info")
}
if infoSection == nil {
return nil, errors.New("Can't not find .debug_info or .zdebug_info")
}
// please note that Data() returns uncompressed data if compressed
if debugInfoBytes, err = infoSection.Data(); err != nil {
return nil, err
}
return debugInfoBytes, nil
}
func openLineSection(elffile *elf.File)([]byte, error) {
var (
debugLineMapTableBytes []byte
err error
)
lineSection := elffile.Section(".debug_line")
if lineSection == nil {
lineSection = elffile.Section(".zdebug_line")
}
if lineSection == nil {
return nil, errors.New("Can't not find .debug_line or .zdebug_line")
}
// please note that Data() returns uncompressed data if compressed
if debugLineMapTableBytes, err = lineSection.Data(); err != nil{
return nil, err
}
return debugLineMapTableBytes, nil
}
func (bi *BI)ParseLineAndInfoSection(dwarfData *dwarf.Data) error {
var (
curEntry *dwarf.Entry
curCompileUnit *CompileUnit
curFunction *Function
err error
ranges [][2]uint64
lineReader *dwarf.LineReader
lineEntry *dwarf.LineEntry
curSubProgramEntry *dwarf.Entry
curCompileUnitEntry *dwarf.Entry
dwarfReader *dwarf.Reader
)
dwarfReader = dwarfData.Reader()
for {
if curEntry, err = dwarfReader.Next(); err != nil{
return err
}
if curEntry == nil {
break
}
if curEntry.Tag == dwarf.TagCompileUnit {
curCompileUnit = &CompileUnit{}
bi.CompileUnits = append(bi.CompileUnits, curCompileUnit)
fields := curEntry.Field
logger.Debug("|================= START ===========================|")
for _, field := range fields {
// for debug log
logger.Debug("TagCompileUnit",
zap.String("Attr", field.Attr.String()),
zap.String("Val", fmt.Sprintf("%v", field.Val)),
zap.String("Class", fmt.Sprintf("%s", field.Class)))
}
logger.Debug("|================== END ============================|")
// LowPc(Attr) + Ranges(Attr) = HighPc, (* Data)Ranges return [LowPc, HightPc]
/*if ranges, err = dwarfData.Ranges(curEntry); err != nil {
return nil, err
}
if ranges != nil && len(ranges) >= 1{
lowPc := ranges[0][0]
hightPc := ranges[0][1]
}
*/
_ = ranges
if lineReader, err = dwarfData.LineReader(curEntry); err != nil {
return err
}
lineEntry = &dwarf.LineEntry{}
cuname, _ := curEntry.Val(dwarf.AttrName).(string)
for {
if err = lineReader.Next(lineEntry); err != nil && err != io.EOF{
return err
}
if err == io.EOF {
err = nil
break
}
logger.Debug("cu:" + cuname, zap.Any("lineEntry", lineEntry))
if lineEntry.File != nil {
if bi.Sources[lineEntry.File.Name] == nil {
bi.Sources[lineEntry.File.Name] = make(map[int][]*dwarf.LineEntry)
}
copyLineEntry := &dwarf.LineEntry{}
*copyLineEntry = *lineEntry
bi.Sources[lineEntry.File.Name][lineEntry.Line] = append(bi.Sources[lineEntry.File.Name][lineEntry.Line], copyLineEntry)
}
}
curCompileUnitEntry = curEntry
}
if curEntry.Tag == dwarf.TagSubprogram {
curFunction = &Function{}
curCompileUnit.functions = append(curCompileUnit.functions, curFunction)
curFunction.cu = curCompileUnit
bi.Functions = append(bi.Functions, curFunction)
fields := curEntry.Field
logger.Debug("|================= START ===========================|")
for _, field := range fields {
switch field.Attr {
case dwarf.AttrName:
if val, ok := field.Val.(string); ok {
curFunction.name = val
}
case dwarf.AttrLowpc:
if val, ok := field.Val.(uint64); ok {
curFunction.lowpc = val
}
case dwarf.AttrHighpc:
if val, ok := field.Val.(uint64); ok {
curFunction.highpc = val
}
case dwarf.AttrFrameBase:
if val, ok := field.Val.([]byte); ok {
curFunction.frameBase = val
}
case dwarf.AttrDeclFile:
if val, ok := field.Val.(int64); ok {
curFunction.declFile = val
}
case dwarf.AttrExternal:
if val, ok := field.Val.(bool); ok {
curFunction.external = val
}
default:
logger.Debug("analyze:TagSubprogram unknow attr", zap.Any("field",field))
}
// for debug log
logger.Debug("TagSubprogram",
zap.String("Attr", field.Attr.String()),
zap.String("Val", fmt.Sprintf("%v", field.Val)),
zap.String("Class", fmt.Sprintf("%s", field.Class)))
}
logger.Debug("|================== END ============================|")
curSubProgramEntry = curEntry
}
/*curEntry.Tag == dwarf.TagArrayType ||
curEntry.Tag == dwarf.TagBaseType ||
curEntry.Tag == dwarf.TagClassType ||
curEntry.Tag == dwarf.TagStructType ||
curEntry.Tag == dwarf.TagConstType ||
curEntry.Tag == dwarf.TagPointerType ||
curEntry.Tag == dwarf.TagStringType */
if curEntry.Tag == dwarf.TagVariable {
curFunction.variables = append(curFunction.variables, curEntry)
logger.Debug("|================= START ===========================|")
fields := curEntry.Field
for _, field := range fields {
logger.Debug(curEntry.Tag.GoString(),
zap.String("Attr", field.Attr.String()),
zap.String("Val", fmt.Sprintf("%v", field.Val)),
zap.String("Class", fmt.Sprintf("%s", field.Class)))
}
logger.Debug("|================== END ============================|")
}
}
_ = curSubProgramEntry
_ = curCompileUnitEntry
return nil
}
// not considered inline function
func (bi *BI)findFunctionIncludePc(pc uint64) (*Function, error) {
for _, f := range bi.Functions {
if f.lowpc <= pc && pc < f.highpc {
return f, nil
}
}
return nil, &NotFoundFuncErr{pc: pc}
}
func (bi *BI)ParseFrameSection(elffile *elf.File) error {
var (
err error
frameSection *elf.Section
frameData []byte
frameInfo *VirtualUnwindFrameInformation
)
frameSection = elffile.Section(".debug_frame")
if frameSection == nil {
frameSection = elffile.Section(".zdebug_frame")
sectionData := func(s *elf.Section) ([]byte, error) {
b, err := s.Data()
if err != nil && uint64(len(b)) < s.Size {
return nil, err
}
if len(b) >= 12 && string(b[:4]) == "ZLIB" {
dlen := binary.BigEndian.Uint64(b[4:12])
dbuf := make([]byte, dlen)
r, err := zlib.NewReader(bytes.NewBuffer(b[12:]))
if err != nil {
return nil, err
}
if _, err := io.ReadFull(r, dbuf); err != nil {
return nil, err
}
if err := r.Close(); err != nil {
return nil, err
}
b = dbuf
}
return b, nil
}
if frameData, err = sectionData(frameSection); err != nil {
return err
}
} else {
if frameData, err = frameSection.Data(); err != nil {
return err
}
}
if frameSection == nil {
return errors.New("can'tt find the .debug_frame or .zdebug_frame")
}
buffer := bytes.NewBuffer(frameData)
var curCIE *CommonInformationEntry
for {
if frameInfo, err = parseFrameInformation(buffer); err != nil {
if err == io.EOF {
err = nil
break
}
}
if bi.FramesInformation == nil {
bi.FramesInformation = make([]*VirtualUnwindFrameInformation, 0, 1)
}
bi.FramesInformation = append(bi.FramesInformation, frameInfo)
if frameInfo.CIE != nil {
curCIE = frameInfo.CIE
}
if frameInfo.FDE != nil {
frameInfo.FDE.CIE = curCIE
}
}
return err
}
func (bi *BI) findFrameInformation (pc uint64) (*Frame, error) {
var fde *FrameDescriptionEntry
for index, frameInfo := range bi.FramesInformation {
if frameInfo.FDE != nil {
if frameInfo.FDE.begin <= pc && pc <= (frameInfo.FDE.begin + frameInfo.FDE.size) {
//fde = frameInfo.FDE
//break
if fde == nil {
fde = frameInfo.FDE
logger.Debug("findFrameInfomation", zap.Int("index", index))
} else {
return nil, fmt.Errorf("dumplicate fde")
}
}
}
}
if fde == nil {
return nil, fmt.Errorf("not find the frame cover pc = %d", pc)
}
cie := fde.CIE
if cie == nil {
return nil, fmt.Errorf("fde.CIE should not be nil")
}
frame := &Frame{cie: cie, cfa : &DWRule{}, regsRule: make(map[uint64]DWRule)}
logger.Debug("========================= cie start\n")
if err := execCIEInstructions(frame, bytes.NewBuffer(cie.initial_instructions)); err != nil {
return nil, err
}
frame.loc = fde.begin
frame.address = pc
logger.Debug("========================= cie end\n")
logger.Debug("========================= fde.instructions start \n")
if err := execFDEInstructions(frame, bytes.NewBuffer(fde.instructions)); err != nil {
return nil, err
}
logger.Debug("========================= fde.instructions end \n")
var (
regs syscall.PtraceRegs
err error
)
if regs, err = getRegisters(); err != nil {
return nil, err
}
frame.regs = make([]uint64, 17)
frame.regs[16] = regs.PC()
frame.regs[7] = regs.Rsp
frame.regs[6] = regs.Rbp
logger.Debug("findFrameInformation",
zap.Any("regs", regs),
zap.Uint64("16", frame.regs[16]),
zap.Uint64("07", frame.regs[7]),
zap.Uint64("06", frame.regs[6]),
)
var framebase uint64
switch frame.cfa.rule {
case RuleCFA:
if frame.cfa.reg >= 17 {
return nil, fmt.Errorf("frame.cfa.reg >= 17")
}
if frame.regs[frame.cfa.reg] == 0 {
return nil, fmt.Errorf("rule.Reg is null")
}
reg := frame.regs[frame.cfa.reg]
framebase = reg + uint64(frame.cfa.offset)
logger.Debug("findFrameInformation",
zap.Uint64("frame.frambebase", frame.framebase),
zap.Int64("offset", frame.cfa.offset),
zap.Uint64("framebase", framebase))
/*case RuleOffset:
addr := frame.cfa.offset
buf := make([]byte, 8)
if _ ,err := syscall.PtracePeekData(cmd.Process.Pid, uintptr(addr), buf); err !=nil{
return nil, err
}
v := binary.LittleEndian.Uint64(buf)
frame.regs[7] = v
framebase = v*/
default:
return nil, fmt.Errorf("invalid cfa rule %v", frame.cfa.rule)
}
frame.framebase = framebase
return frame, nil
}
func parseLoc(loc string) (string, int, error) {
sps := strings.Split(loc, ":")
if len(sps) != 2{
return "", 0, errors.New("wrong loc should be like filename:lineno")
}
filename, linenostr := sps[0], sps[1]
lineno, err := strconv.Atoi(linenostr)
if err != nil {
return "", 0, errors.New("wrong loc should be like filename:lineno")
}
return filename, lineno, nil
}
func (b *BI) locToPc(loc string) (uint64, error){
filename, lineno, err := parseLoc(loc)
if err != nil {
return 0, err
}
return b.fileLineToPc(filename, lineno)
}
func (b *BI) fileLineToPc(filename string, lineno int) (uint64, error) {
if b.Sources[filename] == nil || b.Sources[filename][lineno] == nil || len(b.Sources[filename][lineno]) == 0{
return 0, NotFoundSourceLineErr
}
return b.Sources[filename][lineno][0].Address, nil
}
func (b *BI) fileLineToPcForBreakPoint(filename string, lineno int) (uint64, error) {
if b.Sources[filename] == nil || b.Sources[filename][lineno] == nil || len(b.Sources[filename][lineno]) == 0{
return 0, NotFoundSourceLineErr
}
lineEntryArray := b.Sources[filename][lineno]
for _, v := range lineEntryArray {
if v.PrologueEnd {
return v.Address, nil
}
}
addr := uint64(0)
for i, v := range lineEntryArray {
if i == 0 {
addr = v.Address
} else {
if addr > v.Address {
addr = v.Address
}
}
}
if addr == 0 {
return 0, NotFoundSourceLineErr
}
return addr, nil
}
func (b *BI) getCurFileLineByPtracePc() (string, int, error ){
var (
pc uint64
err error
)
if pc, err = getPtracePc(); err != nil {
printErr(err)
return "", 0, errors.New("get ptrace pc failed")
}
return bi.pcTofileLine(pc)
}
func (b *BI) pcTofileLine(pc uint64)(string, int, error) {
if b.Sources == nil {
return "", 0, errors.New("no sources file")
}
type Rs struct {
pc uint64
existedPc bool
filename string
lineno int
}
rangeMin := &Rs{}
rangeMax := &Rs{}
for filename, filenameMp := range b.Sources {
for lineno, lineEntryArray := range filenameMp {
for _, lineEntry := range lineEntryArray {
if lineEntry.Address == pc {
return filename, lineno, nil
}
if lineEntry.Address <= pc && (!rangeMin.existedPc || lineEntry.Address > rangeMin.pc) {
rangeMin.pc = lineEntry.Address
rangeMin.existedPc = true
rangeMin.filename = filename
rangeMin.lineno = lineno
}
if pc < lineEntry.Address && (!rangeMax.existedPc || lineEntry.Address < rangeMax.pc) {
rangeMax.pc = lineEntry.Address
rangeMax.existedPc = true
rangeMax.filename = filename
rangeMax.lineno = lineno
}
}
}
}
return rangeMin.filename, rangeMin.lineno, nil
}
func (bi *BI)getSingleMemInst(pc uint64) (x86asm.Inst, error){
var (
mem []byte
err error
inst x86asm.Inst
)
mem = make([]byte, 100)
if _, err = syscall.PtracePeekData(cmd.Process.Pid, uintptr(pc), mem); err != nil {
return x86asm.Inst{}, err
}
if inst ,err = x86asm.Decode(mem, 64); err != nil {
return x86asm.Inst{}, err
}
return inst, nil
}