如何使用gdbclient gdbserver调试C/C++ native文件

如何使用gdbclient gdbserver调试C/C++ native文件

user@aclgcl-ubnt:/data1/AJ9_3$ adb forward tcp:5039 tcp:5039
user@aclgcl-ubnt:/data1/AJ9_3$ adb shell
root@idol347:/ # ps |grep systemui
u0_a29    8320  320   1001848 88264 ffffffff b6fb14b8 S com.android.systemui
root@idol347:/ # gdbserver :5039 --attach 8320
Attached; pid = 8320
Listening on port 5039
Remote debugging from host 127.0.0.1

user@aclgcl-ubnt:/data1/AJ9_3$ gdbclient app_process32 :5039

user@aclgcl-ubnt:/data1/AJ9_3$ gdbclient app_process32 :5039
Process is 'system/bin/app_process32'
Port is :5039

If you haven't done so already, do this first on the device:
gdbserver :5039 /system/bin/app_process32
or
gdbserver :5039 --attach <PID>

GNU gdb (GDB) 7.6
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=x86_64-linux-gnu --target=arm-linux-android".
For bug reporting instructions, please see:
<http://source.android.com/source/report-bugs.html>...
Reading symbols from /data1/AJ9_3/out/target/product/idol347/symbols/system/bin/app_process32...done.
warning: while parsing target library list: not well-formed (invalid token)
warning: Could not load shared library symbols for 10 libraries, e.g. libNimsWrap.so.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?
getegid () at bionic/libc/arch-arm/syscalls/getegid.S:6
6	    mov     ip, r7
Function "art_sigsegv_fault" not defined.
Breakpoint 1 (art_sigsegv_fault) pending.
ART debugging mode is enabled.
If you are debugging a native only process, you need to
re-enable normal SIGSEGV handling using this command:
handle SIGSEGV print stop
(gdb) b SetTorchBrightness
Breakpoint 2 at 0xa577c6b8: file frameworks/base/packages/SystemUI/jni/torchnative.cpp, line 152.
(gdb) c
Continuing.
[New Thread 2164]
[Switching to Thread 2164]

Breakpoint 2, SetTorchBrightness (env=0xb89d6180, thiz=0xa588fa2c, brightness=200) at frameworks/base/packages/SystemUI/jni/torchnative.cpp:152
warning: Source file is more recent than executable.
152	static jint SetTorchBrightness(JNIEnv *env, jobject thiz,jint brightness) {
(gdb) list
147	  //result = read_int(get_torch_path());
148	  //[BUGFIX] Mod-END-by-TSCD.jin.dong 01/14/2015 PR-890978
149	  return result;
150	}
151
152	static jint SetTorchBrightness(JNIEnv *env, jobject thiz,jint brightness) {
153	  TCTALOGE("==========SetTorchBrightness");
154	  int result;
155
156	  	char *ptr = "test";
157		strcpy(ptr, "TEST");
158
(gdb) n
153	  TCTALOGE("==========SetTorchBrightness");
(gdb) n
152	static jint SetTorchBrightness(JNIEnv *env, jobject thiz,jint brightness) {
(gdb) n
153	  TCTALOGE("==========SetTorchBrightness");
(gdb) n
157		strcpy(ptr, "TEST");
(gdb) n
warning: while parsing target library list: not well-formed (invalid token)
warning: while parsing target library list: not well-formed (invalid token)

Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.
(gdb)