gdb除錯Android native程式碼
阿新 • • 發佈：2018-12-09
除錯環境：
Ubuntu 16.04,win10,android 7.1
其中，win10主機通過USB與被測試機連線，Ubuntu16.04上有android 7.1 SDK程式碼及編譯環境，通過本地網路與被測試機連線。
第一部分：
程式碼示例：
test.cpp:
#include <stdlib.h> #include <iostream> #include <stdio.h> #include <unistd.h> int main() { printf("main start...\n"); int x=5; printf("x=%d\n",x); while(true) { printf("%d \n",x); x++; sleep(1); } return 0; }
Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := test
LOCAL_SRC_FILES := test.cpp
LOCAL_CFLAGS := -g
LOCAL_STRIP_MODULE :=false
LOCAL_CPPFLAGS := -g -O0
include $(BUILD_EXECUTABLE)以上程式碼可以放到system/core/test目錄，然後編譯生成test。這邊要注意的是，我們需要使用：
out/target/product/***/symbols/system/bin/test 這個bin應用，而非
out/target/product/***/system/bin/test 目錄下的test。然後將test push到被測試機的/system/bin目錄：
D:\callen\Downloads {git}
{lamb} adb root
D:\callen\Downloads {git}
{lamb} adb remount
remount succeeded
D:\callen\Downloads {git}
{lamb} adb push test /system/bin
test: 1 file pushed. 1.6 MB/s (20560 bytes in 0.012s)第二部分：
這邊通過android開啟wifi,PC端通過網路連線。
首先，配置連線：
Win10:
1). 配置埠：
adb tcpip 5555
2). 獲取IP：
adb shell ifconfig |grep "inet addr"
D:\callen\Downloads {git}
{lamb} adb tcpip 5555
//獲取被測試機IP
D:\callen\Downloads {git}
{lamb} adb shell ifconfig |grep "inet addr"
inet addr:127.0.0.1 Mask:255.0.0.0
inet addr:172.16.37.216 Bcast:172.16.37.255 Mask:255.255.255.0Ubuntu:
連線被測試機：
adb connect 172.16.37.216
[email protected]:~/N$ adb connect 172.16.37.216
connected to 172.16.37.216:5555第三部分：
1.android啟動gdbserver 來執行被除錯應用：
rk3399_mid:/ # gdbserver64 :22335 /system/bin/test
Process /system/bin/test created; pid = 1421
Listening on port 22335配置在埠22335監聽，test的程序號是1421
2.Ubuntu端：
當前路徑位於SDK原始碼根目錄。
通過gdbclient方式（需要source 編譯環境）：
Usage: gdbclient <pid|processname> [port number]
[email protected]:~/N$ gdbclient 1421 22335
It looks like gdbserver is already attached to 3592 (process is traced), trying to connect to it using local port=22335
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Reading symbols from out/target/product/rk3399_mid/symbols/system/bin/test...done.
__dl__start () at bionic/linker/arch/arm64/begin.S:32
32 mov x0, sp連線上後，Win端的輸出如下：
rk3399_mid:/ # gdbserver64 :22335 /system/bin/test
Process /system/bin/test created; pid = 1421
Listening on port 22335
Remote debugging from host 127.0.0.1執行dir關聯下程式碼：
(gdb) dir system/core/test
Source directories searched: /home/cai/N/system/core/test:$cdir:$cwd列印堆疊：
(gdb) bt
#0 __dl__start () at bionic/linker/arch/arm64/begin.S:32
#1 0x0000000000000000 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)檢視當前斷點情況：
(gdb) info b
No breakpoints or watchpoints.新增斷點：
(gdb) info b
No breakpoints or watchpoints.
(gdb) b system/core/test/test.cpp:7
Breakpoint 1 at 0x5555555690: file system/core/dd/test.cpp, line 7.
(gdb) b system/core/test/test.cpp:13
Breakpoint 2 at 0x55555556d4: file system/core/dd/test.cpp, line 13.檢視斷點：
(gdb) info b
Num Type Disp Enb Address What
1 breakpoint keep y 0x0000005555555690 in main() at system/core/test/test.cpp:7
2 breakpoint keep y 0x00000055555556d4 in main() at system/core/test/test.cpp:13繼續執行當前應用：
(gdb) c
Continuing.
Breakpoint 1, main () at system/core/test/test.cpp:7
7 printf("main start...\n");可見已經在原始碼的第一個斷點停住了。
輸入c繼續執行，在第二個斷點暫停：
(gdb) c
Continuing.
Breakpoint 2, main () at system/core/test/test.cpp:13
13 x++;列印當前斷點變數值：
(gdb) p x
$1 = 5