Linux Debugging Solutions In Qemu Arm

If you’ve seen qemu arm linux debugging, this guide should help you.

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  sudo apt-get install gdb-multiarch gcc-arm-linux-gnueabihf qemu-userprintf '#include #include int main ()    met ("Hello everyone");    Return EXIT_SUCCESS;'> Bonjour_monde .carm-linux-gnueabihf-gcc -fno-pie -ggdb3 -no-pie -o hello_world hello_world.cqemu-arm -L / usr / arm-linux-gnueabihf -g 1234 ./hello_world 

  gdb-multiarch -e --nh n  -ex 'define constructive hand' n  -ex 'set system root / usr / arm-linux-gnueabihf' n  -ex 'file hello_world' n  'target -ex restore remote computer localhost: 1234' n  -ex 'main interrupt' n  -ex continue n  - treasury "fractional order"; 

This takes us from main to a view of splitting and disassembling code due to split layout . You may also be interested in:

  layout rules. 

Ultimately, however, the GDB control panel is more flexible and robust: with a GDB split view with code

-fno-pie -no-pie is still required because the Ubuntu GCC package bypasses -fpie -pie and they don’t work due to a good bug QEMU Solid: How Can I debug a dynamically linked executable in a GDB loop in all QEMU user modes?

There was no functionality Type gdbserver --multi for QEMU GDB stub in QEMU 2.11: how to restart user agents in QEMU mode for GDB stub like the ones on the market appear in gdbserver – multiple?

For those new to ARM assembly, I’ll start with some executable examples with assertions and using the classic C library for I / O at: https://github.com/cirosantilli/arm -assembly-cheat

This similar procedure also works on ARM, a stand-alone example (not the standard library):

  printf '.Data    New:        .ascii "Hello everyone  n"    len implies. - New.Text.global _start_Start off:   / * Write the system call * /    mov r0, # 1 / * standard output * /    ldr r1, = msg / * current * /    ldr r2, = len / * len * /    mov r7, # 4 / * System call identifier. * /    swi # 0    / * Exit system call * /   Shift r0, # 0 / * status. * /    mov r7, # 1 / * syscall ID. * /    swi # 0'> hello_world.Sarm-linux-gnueabihf-gcc -ggdb3 -nostdlib -o hello_world -static hello_world.Sqemu-arm -g 2345 ./hello_world 

  gdb-multiarch -q --nh n  -Ex-girlfriend 'put her hand on architecture' n  -ex lover 'hello_world file' n  'target - old remote partner localhost: 1234' n  -ex 'split layout' n; 

Now onc has the first statement for the entire program.

• Linux Kernel: How to Debug Linux Kernel with GDB and QEMU?
• Naked opera: https://github.com/cirosantilli/newlib-examples/tree/f70f8a33f8b727422bd6f0b2975c4455d0b33efa#gdb

In the previous two best articles, “How to Get GDB to Debug Applications” and in addition to “Using GDB to Debug Functions in Another C File”, most of them showed you some basic steps to do this. this uses GDB to debug your programs running on x86 based desktops.

In this article, we have to show you how to debug an ARM binary that has been compiled for many ARM targets embedded in some ARM QEMUs. Binary on qemu.

Download the latest ARM toolkit from https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads we have gcc -arm – bought. none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2 is the modern toolchain at the time of this writing.

  $ mkdir -k / home / myuser / workspace$ cd workspace  

Copy the downloaded file that links this workspace directory to the toolchain and also extract Keep the bin path so that we have all binaries in an incurable path

  $ tar xvf gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.Export bz2  

  $ PATH = $ PATH: / home / myuser / workspace / gcc-arm-none-eabi-10-2020-q4-major / bin  

After your entire family path is exported, you will see arm-none-eabi-gcc available in the terminal.

  $ vim helloworld.c  

  #include int main (int argc, char ** argv)       Integer = 0;        printf ("Hello everyone  n");        printf ("Addition:% d  n", 3 + 2);        visit your blog 0; 

The above simple program introduces helloworld and also outputs the addition of two more numbers. We will compile this course with the following command

  $ arm-linux-gnueabihf-gcc -o helloworld helloworld.c -static -g  

• Note that we can eat the “arm-linux-gnueabihf-gcc” installed on the Ubuntu machine from the GCC toolchain as we use the installed toolchain in Ubuntu to reduce library conflicts. used with the -static option to successfully debug qemu-arm.
• we also added “-static” if we have this model in qemu. there seems to be no correct library versions to match between qin mind with these programs that have always crashed.
• The last “-g” is used to add debugging to any symbol used for debugging with GDB.

  command $ qemu-arm -L gcc-arm-none-eabi-10-2020-q4-major / lib -g 8090. / helloworld  

This suspends the debugger connection to port 8090 problem, here you can take any port into account.

Connect GDB

  $ arm-none-eabi-gdb  

  (gdb) helloworld data fileRead the helloworld symbols ...  

  (gdb) target remote: 8090Consumed for remote debugging: 80900x0000816c _start ()  

  (gdb) head bust  

  (gdb) cProceed.Breakpoint 1, main (argc = 1, argv = 0xffffef184) at helloworld_src / helloworld.Num c: 66 integer = 0;  

As you can see above, after setting a breakpoint and requesting a continuation, our program stopped at a major point.

Now we will probably continue as this article is only intended to show you how you can set up your debugging environment in our next article. “Set various breakpoints in GDB when debugging”

  (gdb) cProceed.[Child 1 (process 1) completed normally]  

Here, if you continue your search without setting additional breakpoints, you can see the program that worked fine and we have the final product printed on the terminal initially on qemu -arm expected port 8090,

  $ qemu-arm -L gcc-arm-none-eabi-10-2020-q4-major / lib -g 8090 ./helloworldHello WorldAddition: 5  

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