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GDB常用命令

时间:2021-07-01 10:21:17 帮助过:15人阅读

 【打印调用栈】

(gdb) bt
 #0  epoll_wait () at bionic/libc/arch-arm/syscalls/epoll_wait.S:10
 #1  0x401275ea in android::Looper::pollInner (this=this@entry=0x747fd3f0, timeoutMillis=<optimized out>, timeoutMillis@entry=85688516) at system/core/libutils/Looper.cpp:223
 #2  0x40127814 in android::Looper::pollOnce (this=0x747fd3f0, timeoutMillis=85688516, outFd=outFd@entry=0x0, outEvents=outEvents@entry=0x0, outData=outData@entry=0x0)     at system/core/libutils/Looper.cpp:191
 #3  0x401d13dc in pollOnce (timeoutMillis=<optimized out>, this=<optimized out>) at system/core/include/utils/Looper.h:176
 #4  android::NativeMessageQueue::pollOnce (this=0x747fef58, env=0x4151dfa8, timeoutMillis=<optimized out>) at frameworks/base/core/jni/android_os_MessageQueue.cpp:97
 #5  0x4153d310 in dvmPlatformInvoke () at dalvik/vm/arch/arm/CallEABI.S:258
 #6  0x4156d8de in dvmCallJNIMethod (args=0x6d5a5e18, pResult=0x4151f568, method=0x6d60e2d8, self=0x4151f558) at dalvik/vm/Jni.cpp:1159
 #7  0x41546724 in dalvik_mterp () at dalvik/vm/mterp/out/InterpAsm-armv7-a-neon.S:16240

 

【切换到调用栈的第n层】

 (gdb) f 11
 #11 0x41587ff6 in Dalvik_java_lang_reflect_Method_invokeNative (args=<optimized out>, pResult=0x4151f568) at dalvik/vm/native/java_lang_reflect_Method.cpp:101
101                    noAccessCheck);

 

【显示汇编代码】

 (gdb) disassemble 
 Dump of assembler code for function Dalvik_java_lang_reflect_Method_invokeNative(u4 const*, JValue*):
    0x41587f7c <+0>:    stmdb    sp!, {r0, r1, r2, r4, r5, r6, r7, r8, r9, r10, r11, lr}
    0x41587f80 <+4>:    add.w    r4, r0, #12
    0x41587f84 <+8>:    ldmia.w    r4, {r4, r8, r9}
    0x41587f88 <+12>:    mov    r5, r0
    0x41587f8a <+14>:    mov    r11, r1
    0x41587f8c <+16>:    ldr    r6, [r0, #4]
    0x41587f8e <+18>:    ldr    r7, [r0, #8]
    0x41587f90 <+20>:    ldr.w    r10, [r0, #28]
    0x41587f94 <+24>:    ldr    r1, [r5, #24]
    0x41587f96 <+26>:    mov    r0, r4
    0x41587f98 <+28>:    bl    0x4158e828 <dvmSlotToMethod(ClassObject*, int)>
    0x41587f9c <+32>:    ldr    r3, [r0, #4]
    ...

(gdb) disassemble 0x401b406c
 Dump of assembler code for function _JNIEnv::CallStaticVoidMethod(_jclass*, _jmethodID*, ...):
    0x401b4058 <+0>:    push    {r2, r3}
    0x401b405a <+2>:    push    {r0, r1, r4, lr}
    0x401b405c <+4>:    add    r3, sp, #16
    0x401b405e <+6>:    ldr    r4, [r0, #0]
    0x401b4060 <+8>:    ldr.w    r2, [r3], #4
    0x401b4064 <+12>:    ldr.w    r4, [r4, #568]    ; 0x238
    0x401b4068 <+16>:    str    r3, [sp, #4]
    0x401b406a <+18>:    blx    r4
    0x401b406c <+20>:    ldmia.w    sp!, {r2, r3, r4, lr}
    0x401b4070 <+24>:    add    sp, #8
    0x401b4072 <+26>:    bx    lr
 End of assembler dump.

 

【查看当前的寄存器值】

 (gdb) info reg
 r0             0x0    0
 r1             0x4151dfa8    1095884712
 r2             0x10    16
 r3             0x0    0
 r4             0x4175c138    1098236216
 r5             0x6d68eeb8    1835593400
 r6             0x0    0
 r7             0x42dc4350    1121731408
 r8             0x42dc4278    1121731192
 r9             0x416f12a8    1097798312
 r10            0x0    0
 r11            0x4151f568    1095890280
 r12            0xbe88e2d8    3196642008
 sp             0xbe88e6c0    0xbe88e6c0
 lr             0x41587ff7    1096318967
 pc             0x41587ff6    0x41587ff6 <Dalvik_java_lang_reflect_Method_invokeNative(u4 const*, JValue*)+122>
 cpsr           0x200f0030    537854000

 

【显示当前进程的所有线程】

 (gdb) info thread
   Id   Target Id         Frame 
   15   LWP 1992          epoll_wait () at bionic/libc/arch-arm/syscalls/epoll_wait.S:10
   14   LWP 2076          epoll_wait () at bionic/libc/arch-arm/syscalls/epoll_wait.S:10
   13   LWP 1815          __futex_syscall3 () at bionic/libc/arch-arm/bionic/futex_arm.S:39
   12   LWP 1814          recvmsg () at bionic/libc/arch-arm/syscalls/recvmsg.S:9
   11   LWP 1808          __futex_syscall3 () at bionic/libc/arch-arm/bionic/futex_arm.S:39
   10   LWP 1817          __futex_syscall3 () at bionic/libc/arch-arm/bionic/futex_arm.S:39
   9    LWP 1813          __rt_sigtimedwait () at bionic/libc/arch-arm/syscalls/__rt_sigtimedwait.S:10
   8    LWP 1819          __futex_syscall3 () at bionic/libc/arch-arm/bionic/futex_arm.S:39
   7    LWP 2062          __futex_syscall3 () at bionic/libc/arch-arm/bionic/futex_arm.S:39
   6    LWP 1818          __futex_syscall3 () at bionic/libc/arch-arm/bionic/futex_arm.S:39
   5    LWP 1826          __ioctl () at bionic/libc/arch-arm/syscalls/__ioctl.S:9
   4    LWP 2320          __ioctl () at bionic/libc/arch-arm/syscalls/__ioctl.S:9
   3    LWP 2210          epoll_wait () at bionic/libc/arch-arm/syscalls/epoll_wait.S:10
   2    LWP 1824          __ioctl () at bionic/libc/arch-arm/syscalls/__ioctl.S:9
 * 1    LWP 1804          epoll_wait () at bionic/libc/arch-arm/syscalls/epoll_wait.S:10

 

【切换线程】

 (gdb) t 9
 [Switching to thread 9 (LWP 1813)]
 #0  __rt_sigtimedwait () at bionic/libc/arch-arm/syscalls/__rt_sigtimedwait.S:10
 10        mov     r7, ip

 (gdb) bt
 #0  __rt_sigtimedwait () at bionic/libc/arch-arm/syscalls/__rt_sigtimedwait.S:10
 #1  0x400b039c in sigwait (set=<optimized out>, sig=0x7194ad48) at bionic/libc/bionic/sigwait.cpp:43
 #2  0x415716ca in signalCatcherThreadStart (arg=<optimized out>) at dalvik/vm/SignalCatcher.cpp:287
 #3  0x41574176 in internalThreadStart (arg=0x747fd9d8) at dalvik/vm/Thread.cpp:1746
 ...

 

【查看内存值】

 (gdb) x /32wx 0x7194ad48
 0x7194ad48:    0x00000004    0x6fbf3830    0x415dabd8    0x41573619
 0x7194ad58:    0x41700880    0x42dc0768    0x00000005    0x00000001
 0x7194ad68:    0x00000001    0x00000000    0x6fbf3830    0x747fd9d8
 0x7194ad78:    0x415dabd8    0xbe88e598    0x747fd9d8    0x41574129
 0x7194ad88:    0x7184d000    0x415db07c    0x400e92ec    0x41574177
 0x7194ad98:    0x747fd9d8    0x00010002    0x747fd9f8    0x41700880
 0x7194ada8:    0x7194add0    0x747f85a8    0x41574129    0x400aa1d4
 0x7194adb8:    0x747fd9d8    0x747f85a8    0x7194add0    0x00000001
 
 (gdb) x /20c 0xbe88eb48
 0xbe88eb48:    47 ‘/‘    115 ‘s‘    98 ‘b‘    105 ‘i‘    110 ‘n‘    58 ‘:‘    47 ‘/‘    118 ‘v‘
 0xbe88eb50:    101 ‘e‘    110 ‘n‘    100 ‘d‘    111 ‘o‘    114 ‘r‘    47 ‘/‘    98 ‘b‘    105 ‘i‘
 0xbe88eb58:    110 ‘n‘    58 ‘:‘    47 ‘/‘    115 ‘s‘

 

【显示符号】

 (gdb) p *(Method*)0x6d682328
 $1 = {clazz = 0x41755dc0, accessFlags = 9, methodIndex = 0, registersSize = 6, outsSize = 3, insSize = 1, name = 0x6f8c1862 <Address 0x6f8c1862 out of bounds>, prototype = {dexFile = 0x6d5aac48,  protoIdx = 3750}, shorty = 
0x6f88be67 <Address 0x6f88be67 out of bounds>, insns = 0x6f745d98, jniArgInfo = 0, nativeFunc = 0x0, fastJni = false, noRef = false, shouldTrace = false,  registerMap = 0x71a557d8, inProfile = false} 

 

【若干配置】

set print pretty on     :结构体显示的漂亮一些
set print union          :设置显示结构体时,是否显式其内的联合体数据。
set print vtbl             :当此选项打开时,GDB将用比较规整的格式来显示虚函数表时。其默认是关闭的。
例如:

 (gdb)  set print pretty on

 (gdb) p *(Method*)0x6d682328
 $2 = {
   clazz = 0x41755dc0, 
   accessFlags = 9, 
   methodIndex = 0, 
   registersSize = 6, 
   outsSize = 3, 
   insSize = 1, 
   name = 0x6f8c1862 <Address 0x6f8c1862 out of bounds>, 
   prototype = {
     dexFile = 0x6d5aac48, 
     protoIdx = 3750
   }, 
   shorty = 0x6f88be67 <Address 0x6f88be67 out of bounds>, 
   insns = 0x6f745d98, 
   jniArgInfo = 0, 
   nativeFunc = 0x0, 
   fastJni = false, 
   noRef = false, 
   shouldTrace = false, 
   registerMap = 0x71a557d8, 
   inProfile = false
 }

 

【C++中命名空间显示错误问题】
(gdb)  p *(art::ScopedObjectAccess *) 0xbe81e618
A syntax error in expression, near `) 0xbe81e618‘.
解决方案:用单引号‘‘将类型名扩起来,如:
(gdb) p *(‘art::ScopedObjectAccess‘ *) 0xbe81e618
$19 = {
  <art::ScopedObjectAccessUnchecked> = {
    <art::ScopedObjectAccessAlreadyRunnable> = {
      self_ = 0xb4f07800,
      env_ = 0xb4f512b0,
      vm_ = 0xb4f5c280
    },
    members of art::ScopedObjectAccessUnchecked:
    tsc_ = {
      self_ = 0xb4f07800,
      thread_state_ = art::kRunnable,
      old_thread_state_ = art::kNative,       expected_has_no_thread_ = false
    }
  }, <No data fields>}

 

【如何获取类成员在类中的偏移】
(gdb) p &((‘art::ScopedObjectAccess‘ *)0)->tsc_.expected_has_no_thread_ 
$26 = (const bool *) 0x18

(gdb) p &((‘art::ScopedObjectAccess‘ *)0)->env_
$27 = (art::JNIEnvExt * const *) 0x4

(gdb) p &((struct task_struct *)0)->prio
 $1 = (int *) 0x30 

 

【如何获取类的大小】

 (gdb) p ((‘art::ScopedObjectAccess‘ *)0)+1
$33 = (art::ScopedObjectAccess *) 0x1c

 

【设置代码搜索路径】

(gdb) directory ~/disk/android/
Source directories searched: /home/disk/android:$cdir:$cwd
(gdb) list 67 } 68 69 // Uncompress an encoded reference from its bit representation. 70 MirrorType* UnCompress() const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 71 uintptr_t as_bits = kPoisonReferences ? -reference_ : reference_; 72 return reinterpret_cast<MirrorType*>(as_bits); 73 } 74 75 friend class Object; 76

 

GDB常用命令

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