sudo apt-get install qemu

sudo apt-get install g++-arm-linux-gnueabi

git clone https://github.com/sys-build/embedded_env_arm32.git

arm-linux-gnueabi-gcc -o hello hello.s main.c -static
qemu-arm hello

qemu-arm -g 1234 hello
$ arm-none-eabi-gdb
(gdb) target remote :1234
Remote debugging using :1234
warning: A handler for the OS ABI "GNU/Linux" is not built into this configuration
of GDB. Attempting to continue with the default armv5t settings.

0x0001044c in _start ()
(gdb) file ./hello
A program is being debugged already.
Are you sure you want to change the file? (y or n) y
Reading symbols from /home/zzy/sda7/virtual_platform/02codebase/02sys_build/embedded_env_arm32/hello...(no debugging symbols found)...done.
(gdb) b add
Breakpoint 1 at 0x105b4
(gdb) c
Continuing.

Breakpoint 1, 0x000105b4 in add ()
(gdb) info r
r0 0x3 3
r1 0xf6fff064 -150998940
r2 0xf6fff06c -150998932
r3 0x105c4 67012
r4 0xf6ffef28 -150999256
r5 0x10d48 68936
r6 0x0 0
r7 0x0 0
r8 0x0 0
r9 0x0 0
r10 0x96f6c 618348
r11 0xf6ffef14 -150999276
r12 0x0 0
sp 0xf6ffef10 0xf6ffef10
lr 0x105d4 67028
pc 0x105b4 0x105b4
cpsr 0x60000010 1610612752
(gdb) s
Single stepping until exit from function add,
which has no line number information.
0x000105d4 in main ()
(gdb) info r
r0 0x3 3
r1 0x1 1
r2 0x2 2
r3 0x105c4 67012
r4 0xf6ffef28 -150999256
r5 0x10d48 68936
r6 0x0 0
r7 0x0 0
r8 0x0 0
r9 0x0 0
r10 0x96f6c 618348
r11 0xf6ffef14 -150999276
r12 0x0 0
sp 0xf6ffef10 0xf6ffef10
lr 0x105d4 67028
pc 0x105d4 0x105d4
cpsr 0x60000010 1610612752
(gdb)