thank you very much. that is correct.
2009/3/6 robert song <robertsong.linux@xxxxxxxxx>:
> Hello, everyone.
> It is another question, now I used kview to test, by rebuilding it in the
> kdegraphics-3.5.4 with -finstrument-functions option. But I found that in
> libkdeinit_kview.so, one function can have multiply profiling entry, for
> example, kdemain function (located in kdegraphics-3.5.4/kview/main.cpp)
> has three _cyg_profile_func_{enter,exit} pairs.
>
> the return address after these entries are located at:
> kdegraphics-3.5.4/kview/main.cpp:39
> /usr/lib/qt-3.3/include/qapplication.h:501
> kdegraphics-3.5.4/kview/main.cpp:45
>
> I don't know why this happens, and can anyone help me ?
>
> objdump content is below:
> 00016da0 <kdemain>:
> 16da0: 55 push %ebp
> 16da1: 89 e5 mov %esp,%ebp
> 16da3: 57 push %edi
> 16da4: bf 01 00 00 00 mov $0x1,%edi
> 16da9: 56 push %esi
> 16daa: 53 push %ebx
> 16dab: e8 67 33 ff ff call a117 <__i686.get_pc_thunk.bx>
> 16db0: 81 c3 80 35 00 00 add $0x3580,%ebx
> 16db6: 81 ec 9c 01 00 00 sub $0x19c,%esp
> 16dbc: 8b 45 04 mov 0x4(%ebp),%eax
> 16dbf: 89 44 24 04 mov %eax,0x4(%esp)
> 16dc3: 8b 83 9c ff ff ff mov 0xffffff9c(%ebx),%eax
> 16dc9: 89 04 24 mov %eax,(%esp)
> 16dcc: e8 43 28 ff ff call 9614
> <__cyg_profile_func_enter <at> plt>
> 16dd1: 8d 83 f9 db ff ff lea 0xffffdbf9(%ebx),%eax
> 16dd7: 89 44 24 24 mov %eax,0x24(%esp)
> 16ddb: 8d 83 bc dc ff ff lea 0xffffdcbc(%ebx),%eax
> 16de1: 89 44 24 18 mov %eax,0x18(%esp)
> 16de5: 8d 83 e0 dc ff ff lea 0xffffdce0(%ebx),%eax
> 16deb: 89 44 24 10 mov %eax,0x10(%esp)
> 16def: 8d 83 0d dc ff ff lea 0xffffdc0d(%ebx),%eax
> 16df5: 89 44 24 0c mov %eax,0xc(%esp)
> 16df9: 8d 83 d0 ce ff ff lea 0xffffced0(%ebx),%eax
> 16dff: 8d 95 6c ff ff ff lea 0xffffff6c(%ebp),%edx
> 16e05: 89 44 24 08 mov %eax,0x8(%esp)
> 16e09: 8d 83 28 dc ff ff lea 0xffffdc28(%ebx),%eax
> 16e0f: 89 95 84 fe ff ff mov %edx,0xfffffe84(%ebp)
> 16e15: 89 14 24 mov %edx,(%esp)
> 16e18: 89 44 24 04 mov %eax,0x4(%esp)
> 16e1c: c7 44 24 20 00 00 00 movl $0x0,0x20(%esp)
> 16e23: 00
> 16e24: c7 44 24 1c 00 00 00 movl $0x0,0x1c(%esp)
> 16e2b: 00
> 16e2c: c7 44 24 14 01 00 00 movl $0x1,0x14(%esp)
> 16e33: 00
> 16e34: e8 ab 28 ff ff call 96e4
> <_ZN10KAboutDataC1EPKcS1_S1_S1_iS1_S1_S1_S1_ <at> plt>
> 16e39: 8d 83 2e dc ff ff lea 0xffffdc2e(%ebx),%eax
> 16e3f: 89 44 24 0c mov %eax,0xc(%esp)
> 16e43: 8d 83 3c dc ff ff lea 0xffffdc3c(%ebx),%eax
> 16e49: 89 44 24 08 mov %eax,0x8(%esp)
> 16e4d: 8d 83 47 dc ff ff lea 0xffffdc47(%ebx),%eax
> 16e53: 89 44 24 04 mov %eax,0x4(%esp)
> 16e57: 8b 85 84 fe ff ff mov 0xfffffe84(%ebp),%eax
> 16e5d: c7 44 24 10 00 00 00 movl $0x0,0x10(%esp)
> 16e64: 00
> 16e65: 89 04 24 mov %eax,(%esp)
> 16e68: e8 17 23 ff ff call 9184
> <_ZN10KAboutData9addAuthorEPKcS1_S1_S1_ <at> plt>
> 16e6d: 8b 95 84 fe ff ff mov 0xfffffe84(%ebp),%edx
> 16e73: 8d 83 56 dc ff ff lea 0xffffdc56(%ebx),%eax
> 16e79: 89 44 24 0c mov %eax,0xc(%esp)
> 16e7d: 8d 83 62 dc ff ff lea 0xffffdc62(%ebx),%eax
> 16e83: 89 44 24 08 mov %eax,0x8(%esp)
> 16e87: 8d 83 71 dc ff ff lea 0xffffdc71(%ebx),%eax
> 16e8d: 89 44 24 04 mov %eax,0x4(%esp)
> 16e91: 89 14 24 mov %edx,(%esp)
> 16e94: c7 44 24 10 00 00 00 movl $0x0,0x10(%esp)
> 16e9b: 00
> 16e9c: e8 e3 22 ff ff call 9184
> <_ZN10KAboutData9addAuthorEPKcS1_S1_S1_ <at> plt>
> 16ea1: 8d 83 83 dc ff ff lea 0xffffdc83(%ebx),%eax
> 16ea7: 89 44 24 0c mov %eax,0xc(%esp)
> 16eab: 8d 83 94 dc ff ff lea 0xffffdc94(%ebx),%eax
> 16eb1: 89 44 24 04 mov %eax,0x4(%esp)
> 16eb5: 8b 85 84 fe ff ff mov 0xfffffe84(%ebp),%eax
> 16ebb: c7 44 24 10 00 00 00 movl $0x0,0x10(%esp)
> 16ec2: 00
> 16ec3: c7 44 24 08 00 00 00 movl $0x0,0x8(%esp)
> 16eca: 00
> 16ecb: 89 04 24 mov %eax,(%esp)
> 16ece: e8 b1 22 ff ff call 9184
> <_ZN10KAboutData9addAuthorEPKcS1_S1_S1_ <at> plt>
> 16ed3: 8b 45 0c mov 0xc(%ebp),%eax
> 16ed6: 8b 95 84 fe ff ff mov 0xfffffe84(%ebp),%edx
> 16edc: c7 44 24 0c 00 00 00 movl $0x0,0xc(%esp)
> 16ee3: 00
> 16ee4: 89 44 24 04 mov %eax,0x4(%esp)
> 16ee8: 8b 45 08 mov 0x8(%ebp),%eax
> 16eeb: 89 54 24 08 mov %edx,0x8(%esp)
> 16eef: 89 04 24 mov %eax,(%esp)
> 16ef2: e8 fd 26 ff ff call 95f4
> <_ZN12KCmdLineArgs4initEiPPcPK10KAboutDatab <at> plt>
> 16ef7: 8d 83 b4 03 00 00 lea 0x3b4(%ebx),%eax
> 16efd: 89 04 24 mov %eax,(%esp)
> 16f00: c7 44 24 0c 00 00 00 movl $0x0,0xc(%esp)
> 16f07: 00
> 16f08: c7 44 24 08 00 00 00 movl $0x0,0x8(%esp)
> 16f0f: 00
> 16f10: c7 44 24 04 00 00 00 movl $0x0,0x4(%esp)
> 16f17: 00
> 16f18: e8 c7 2c ff ff call 9be4
> <_ZN12KCmdLineArgs17addCmdLineOptionsEPK15KCmdLineOptionsPKcS4_S4_ <at> plt>
> 16f1d: 8d 85 a0 fe ff ff lea 0xfffffea0(%ebp),%eax
> 16f23: 89 85 80 fe ff ff mov %eax,0xfffffe80(%ebp)
> 16f29: 89 04 24 mov %eax,(%esp)
> 16f2c: c7 44 24 08 01 00 00 movl $0x1,0x8(%esp)
> 16f33: 00
> 16f34: c7 44 24 04 01 00 00 movl $0x1,0x4(%esp)
> 16f3b: 00
> 16f3c: e8 23 24 ff ff call 9364
> <_ZN12KApplicationC1Ebb <at> plt>
> 16f41: 8b 93 9c ff ff ff mov 0xffffff9c(%ebx),%edx
> 16f47: 8b 45 04 mov 0x4(%ebp),%eax
> 16f4a: 89 14 24 mov %edx,(%esp)
> 16f4d: 89 44 24 04 mov %eax,0x4(%esp)
> 16f51: e8 be 26 ff ff call 9614
> <__cyg_profile_func_enter <at> plt>
> 16f56: 8b 45 04 mov 0x4(%ebp),%eax
> 16f59: 89 44 24 04 mov %eax,0x4(%esp)
> 16f5d: 8b 83 9c ff ff ff mov 0xffffff9c(%ebx),%eax
> 16f63: 89 04 24 mov %eax,(%esp)
> 16f66: e8 a9 26 ff ff call 9614
> <__cyg_profile_func_enter <at> plt>
> 16f6b: 8b 93 9c ff ff ff mov 0xffffff9c(%ebx),%edx
> 16f71: 8b 45 04 mov 0x4(%ebp),%eax
> 16f74: 0f b6 b5 e4 fe ff ff movzbl 0xfffffee4(%ebp),%esi
> 16f7b: 89 14 24 mov %edx,(%esp)
> 16f7e: 89 44 24 04 mov %eax,0x4(%esp)
> 16f82: e8 0d 2b ff ff call 9a94
> <__cyg_profile_func_exit <at> plt>
> 16f87: 8b 45 04 mov 0x4(%ebp),%eax
> 16f8a: 89 44 24 04 mov %eax,0x4(%esp)
> 16f8e: 8b 83 9c ff ff ff mov 0xffffff9c(%ebx),%eax
> 16f94: 89 04 24 mov %eax,(%esp)
> 16f97: e8 f8 2a ff ff call 9a94
> <__cyg_profile_func_exit <at> plt>
> 16f9c: 89 f2 mov %esi,%edx
> 16f9e: 84 d2 test %dl,%dl
> 16fa0: 75 34 jne 16fd6 <kdemain+0x236>
> 16fa2: e9 86 00 00 00 jmp 1702d <kdemain+0x28d>
> 16fa7: c7 04 24 00 01 00 00 movl $0x100,(%esp)
> 16fae: 66 90 xchg %ax,%ax
> 16fb0: e8 1f 29 ff ff call 98d4 <_Znwj <at> plt>
> 16fb5: 89 c6 mov %eax,%esi
> 16fb7: 89 04 24 mov %eax,(%esp)
> 16fba: e8 65 28 ff ff call 9824 <_ZN5KViewC1Ev <at> plt>
> 16fbf: 89 7c 24 04 mov %edi,0x4(%esp)
> 16fc3: 83 c7 01 add $0x1,%edi
> 16fc6: c7 44 24 08 01 00 00 movl $0x1,0x8(%esp)
> 16fcd: 00
> 16fce: 89 34 24 mov %esi,(%esp)
> 16fd1: e8 1e 30 ff ff call 9ff4
> <_ZN11KMainWindow7restoreEib <at> plt>
> 16fd6: 89 3c 24 mov %edi,(%esp)
> 16fd9: e8 16 29 ff ff call 98f4
> <_ZN11KMainWindow13canBeRestoredEi <at> plt>
> 16fde: 84 c0 test %al,%al
> 16fe0: 75 c5 jne 16fa7 <kdemain+0x207>
> 16fe2: 8b 85 80 fe ff ff mov 0xfffffe80(%ebp),%eax
> 16fe8: 89 04 24 mov %eax,(%esp)
> 16feb: e8 74 2c ff ff call 9c64
> <_ZN12QApplication4execEv <at> plt>
> 16ff0: 8b 95 80 fe ff ff mov 0xfffffe80(%ebp),%edx
> 16ff6: 89 14 24 mov %edx,(%esp)
> 16ff9: 89 c6 mov %eax,%esi
> 16ffb: e8 04 2d ff ff call 9d04
> <_ZN12KApplicationD1Ev <at> plt>
> 17000: 8b 85 84 fe ff ff mov 0xfffffe84(%ebp),%eax
> 17006: 89 04 24 mov %eax,(%esp)
> 17009: e8 56 27 ff ff call 9764
> <_ZN10KAboutDataD1Ev <at> plt>
> 1700e: 8b 45 04 mov 0x4(%ebp),%eax
> 17011: 8b 93 9c ff ff ff mov 0xffffff9c(%ebx),%edx
> 17017: 89 44 24 04 mov %eax,0x4(%esp)
> 1701b: 89 14 24 mov %edx,(%esp)
> 1701e: e8 71 2a ff ff call 9a94
> <__cyg_profile_func_exit <at> plt>
> 17023: 8d 65 f4 lea 0xfffffff4(%ebp),%esp
> 17026: 89 f0 mov %esi,%eax
> 17028: 5b pop %ebx
> 17029: 5e pop %esi
> 1702a: 5f pop %edi
> 1702b: 5d pop %ebp
> 1702c: c3 ret
> 1702d: c7 04 24 00 00 00 00 movl $0x0,(%esp)
> 17034: e8 8b 27 ff ff call 97c4
> <_ZN12KCmdLineArgs10parsedArgsEPKc <at> plt>
> 17039: c7 04 24 00 01 00 00 movl $0x100,(%esp)
> 17040: 89 85 8c fe ff ff mov %eax,0xfffffe8c(%ebp)
> 17046: e8 89 28 ff ff call 98d4 <_Znwj <at> plt>
> 1704b: 89 85 90 fe ff ff mov %eax,0xfffffe90(%ebp)
> 17051: 89 04 24 mov %eax,(%esp)
> 17054: e8 cb 27 ff ff call 9824 <_ZN5KViewC1Ev <at> plt>
> 17059: 8b 95 90 fe ff ff mov 0xfffffe90(%ebp),%edx
> 1705f: 8b 02 mov (%edx),%eax
> 17061: 89 14 24 mov %edx,(%esp)
> 17064: ff 90 bc 00 00 00 call *0xbc(%eax)
> 1706a: 8b 85 8c fe ff ff mov 0xfffffe8c(%ebp),%eax
> 17070: 89 04 24 mov %eax,(%esp)
> 17073: e8 6c 27 ff ff call 97e4
> <_ZNK12KCmdLineArgs5countEv <at> plt>
> 17078: 85 c0 test %eax,%eax
> 1707a: 0f 8e dd 00 00 00 jle 1715d <kdemain+0x3bd>
> 17080: 8d 83 a3 dc ff ff lea 0xffffdca3(%ebx),%eax
> 17086: 8d 7d f0 lea 0xfffffff0(%ebp),%edi
> 17089: 89 44 24 04 mov %eax,0x4(%esp)
> 1708d: 8d 75 a0 lea 0xffffffa0(%ebp),%esi
> 17090: 89 3c 24 mov %edi,(%esp)
> 17093: e8 9c 22 ff ff call 9334 <_ZN7QStringC1EPKc <at> plt>
> 17098: 8b 95 8c fe ff ff mov 0xfffffe8c(%ebp),%edx
> 1709e: 89 34 24 mov %esi,(%esp)
> 170a1: c7 44 24 08 00 00 00 movl $0x0,0x8(%esp)
> 170a8: 00
> 170a9: 89 54 24 04 mov %edx,0x4(%esp)
> 170ad: e8 92 2d ff ff call 9e44
> <_ZNK12KCmdLineArgs3urlEi <at> plt>
> 170b2: 83 ec 04 sub $0x4,%esp
> 170b5: 89 7c 24 04 mov %edi,0x4(%esp)
> 170b9: 89 34 24 mov %esi,(%esp)
> 170bc: e8 03 21 ff ff call 91c4
> <_ZNK4KURLeqERK7QString <at> plt>
> 170c1: 89 34 24 mov %esi,(%esp)
> 170c4: 88 85 8b fe ff ff mov %al,0xfffffe8b(%ebp)
> 170ca: e8 55 2e ff ff call 9f24 <_ZN4KURLD1Ev <at> plt>
> 170cf: 8b 45 04 mov 0x4(%ebp),%eax
> 170d2: 89 44 24 04 mov %eax,0x4(%esp)
> 170d6: 8b 83 9c ff ff ff mov 0xffffff9c(%ebx),%eax
> 170dc: 89 04 24 mov %eax,(%esp)
> 170df: e8 30 25 ff ff call 9614
> <__cyg_profile_func_enter <at> plt>
> 170e4: 8b 75 f0 mov 0xfffffff0(%ebp),%esi
> 170e7: 8b 45 04 mov 0x4(%ebp),%eax
> 170ea: 8b 93 9c ff ff ff mov 0xffffff9c(%ebx),%edx
> 170f0: 89 44 24 04 mov %eax,0x4(%esp)
> 170f4: 89 14 24 mov %edx,(%esp)
> 170f7: e8 18 25 ff ff call 9614
> <__cyg_profile_func_enter <at> plt>
> 170fc: 8b 3e mov (%esi),%edi
> 170fe: 83 ef 01 sub $0x1,%edi
> 17101: 89 3e mov %edi,(%esi)
> 17103: 8b 45 04 mov 0x4(%ebp),%eax
> 17106: 89 44 24 04 mov %eax,0x4(%esp)
> 1710a: 8b 83 9c ff ff ff mov 0xffffff9c(%ebx),%eax
> 17110: 89 04 24 mov %eax,(%esp)
> 17113: e8 7c 29 ff ff call 9a94
> <__cyg_profile_func_exit <at> plt>
> 17118: 85 ff test %edi,%edi
> 1711a: 75 15 jne 17131 <kdemain+0x391>
> 1711c: 8b 83 98 ff ff ff mov 0xffffff98(%ebx),%eax
> 17122: 8b 55 f0 mov 0xfffffff0(%ebp),%edx
> 17125: 3b 10 cmp (%eax),%edx
> 17127: 74 08 je 17131 <kdemain+0x391>
> 17129: 89 14 24 mov %edx,(%esp)
> 1712c: e8 e3 2b ff ff call 9d14
> <_ZN11QStringData10deleteSelfEv <at> plt>
> 17131: 8b 45 04 mov 0x4(%ebp),%eax
> 17134: 8b 93 9c ff ff ff mov 0xffffff9c(%ebx),%edx
> 1713a: 89 44 24 04 mov %eax,0x4(%esp)
> 1713e: 89 14 24 mov %edx,(%esp)
> 17141: e8 4e 29 ff ff call 9a94
> <__cyg_profile_func_exit <at> plt>
> 17146: 80 bd 8b fe ff ff 00 cmpb $0x0,0xfffffe8b(%ebp)
> 1714d: 74 21 je 17170 <kdemain+0x3d0>
> 1714f: 8b 85 90 fe ff ff mov 0xfffffe90(%ebp),%eax
> 17155: 89 04 24 mov %eax,(%esp)
> 17158: e8 17 23 ff ff call 9474
> <_ZN5KView13loadFromStdinEv <at> plt>
> 1715d: 8b 95 8c fe ff ff mov 0xfffffe8c(%ebp),%edx
> 17163: 89 14 24 mov %edx,(%esp)
> 17166: e8 89 25 ff ff call 96f4
> <_ZN12KCmdLineArgs5clearEv <at> plt>
> 1716b: e9 72 fe ff ff jmp 16fe2 <kdemain+0x242>
> 17170: 8b 95 8c fe ff ff mov 0xfffffe8c(%ebp),%edx
> 17176: 8d 75 c8 lea 0xffffffc8(%ebp),%esi
> 17179: 89 34 24 mov %esi,(%esp)
> 1717c: c7 44 24 08 00 00 00 movl $0x0,0x8(%esp)
> 17183: 00
> 17184: 89 54 24 04 mov %edx,0x4(%esp)
> 17188: e8 b7 2c ff ff call 9e44
> <_ZNK12KCmdLineArgs3urlEi <at> plt>
> 1718d: 8b 85 90 fe ff ff mov 0xfffffe90(%ebp),%eax
> 17193: 83 ec 04 sub $0x4,%esp
> 17196: 89 74 24 04 mov %esi,0x4(%esp)
> 1719a: 89 04 24 mov %eax,(%esp)
> 1719d: e8 b2 25 ff ff call 9754
> <_ZN5KView4loadERK4KURL <at> plt>
> 171a2: 89 34 24 mov %esi,(%esp)
> 171a5: e8 7a 2d ff ff call 9f24 <_ZN4KURLD1Ev <at> plt>
> 171aa: eb b1 jmp 1715d <kdemain+0x3bd>
> 171ac: 90 nop
> 171ad: 90 nop
> 171ae: 90 nop
> 171af: 90 nop
>
> Best Wishes,
> robert
>
>
> 2009/2/27 robert song <robertsong.linux@xxxxxxxxx>:
>> 2009/2/27 Andrew Haley <aph@xxxxxxxxxx>:
>>> robert song wrote:
>>>> Andrew, thank you for your reply.
>>>> Well, the source file can be modified to solve the problem, but I want
>>>> to use one tool to record every address of the running applications
>>>> built with -finstrument-sections option, without modifying the
>>>> application source code itself.
>>>
>>> Try this:
>>>
>>> void
>>> __cyg_profile_func_enter (void *this_fn, void *call_site)
>>> {
>>> Dl_info info;
>>> dladdr(__builtin_return_address(0), &info);
>>>
>>
>> It is a good idea to use __builtin_return_address(0) which will be located
>> between the caller funtion start and end address.
>>
>> Thank you very much.
>>
>> besh wishes,
>> robert
>>
>>> printf ("addr:%lx %p:%s\n", this_fn, info.dli_saddr, info.dli_sname);
>>> }
>>>
>>> Link with -ldl.
>>>
>>>
>>>> But now the address sometimes may be the PLT address of the application,
>>>> and I don't have a good idea to deal with the problem.
>>>>
>>>> If the real address can be got in the __cyg_profile_func_enter()
>>>> function in some way, it will be helpful to analyse.
>>>>
>>>> 2009/2/26 Andrew Haley <aph@xxxxxxxxxx>:
>>>>> The shared library loader is trying to make the code as efficient as possible.
>>>>> When you take the address of a symbol in main, the loader is forced to fix up
>>>>> the reloc with a pointer into the PLT. This happens because at the time the
>>>>> fixup is made, the symbol foo has not been resolved: it'll only be resolved
>>>>> later when the first call to foo happens. So, we have to use the PLT address
>>>>> because we don't yet know where foo is.
>>>>>
>>>>> Because of C's rule that the address of a function must be unique, every subsequent
>>>>> reference to that symbol will return the PLT address, including the one used
>>>>> in the call to __cyg_profile_func_enter().
>>>>>
>>>>> You can get around this by compiling main with -fpic and not globally initializing
>>>>> ptr.
>>>>>
>>>>> void *ptr;
>>>>>
>>>>> int
>>>>> main (int argc, char *argv[])
>>>>> {
>>>>> ptr = foo;
>>>>>
>>>>> cc -fpic -finstrument-functions -g -o main main.c tracer.c foo.so -Wl,-rpath `pwd`
>>>>>
>>>>> $ ./main
>>>>> addr:40073c
>>>>> addr:110634
>>>>> addr:110634
>>>>> addr:11066b
>>>>> addr:11066b
>>>>> addr:40073c
>>>>>
>>>>> Andrew.
>>>>>
>>>>>
>>>
>>>
>>
>
