Native Android GDB remote debug got SIGILL on emulator

[Li Bei]

I built android source code, and built a simple c++ file. Then remote debug it on emulator.

But I always got the error: Program received signal SIGILL, Illegal instruction.

It works well when no break point is set.

If any break point is hit, the SIGILL will be triggered.

I build Android-6.0.1_r11 on Mac OSX

my c++ source code is below:

// ******** external/test/test.cpp ******** //

#include <stdio.h>

int main() {

for(int i=0; i<10; i++){

printf("%d\n", i);

}

return 0;

}

// ******** external/test/Android.mk ********/

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := Test

LOCAL_SRC_FILES := \

    test.cpp \

LOCAL_MODULE_TAGS := optional

include $(BUILD_EXECUTABLE)

Then build and push the files to the emulator:

$ mmm external/test

$ emulator&

$ add push out/debug/target/product/generic/obj/EXECUTABLES/Test_intermediates/LINKED/Test /data/local/tmp

$ adb shell chmod 755 /data/local/tmp/*

the debug steps is below:

(TARGET) $ adb shell /data/local/tmp/gdbserver :1234 /data/local/tmp/test/Test

(HOST) $ ./prebuilts/gcc/darwin-x86/arm/arm-linux-androideabi-4.9/bin/arm-linux-androideabi-gdb out/debug/target/product/generic/obj/EXECUTABLES/Test_intermediates/LINKED/Test

(gdb) b main

Breakpoint 1 at 0xb6f7a5f4: file external/testservice/TestA.cpp, line 3.

(gdb) n

Cannot find bounds of current function

(gdb) c

Continuing.

Breakpoint 1, main () at external/testservice/TestA.cpp:3

3 int main() {

(gdb) n

4 for(int i=0; i<10; i++){

(gdb) n

5 printf("%d\n", i);

(gdb) n

4 for(int i=0; i<10; i++){

(gdb) n

5 printf("%d\n", i);

(gdb) n

4 for(int i=0; i<10; i++){

(gdb) n

Program received signal SIGILL, Illegal instruction.

[Dan Albert]

File a bug rather than mailing the list; it'll get more attention: https://github.com/android-ndk/ndk/issues

Include the version of the NDK you're using when you do (though try r12 beta 1 before you file).

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