View Full Version : [SOLVED] ARM assembly under Linux
chuchi June 26th, 2012, 04:53 PM Hi there!!
I need to learn ARM assembly, and I use Linux. Please, could you give me any starting point about how to install it?? I do not pretend that you teach me ARM assembly. Just a link.
thank you very much!!! youknowme June 27th, 2012, 05:03 AM Hi there!!
I need to learn ARM assembly, and I use Linux. Please, could you give me any starting point about how to install it?? I do not pretend that you teach me ARM assembly. Just a link.
thank you very much!!!
This might be useful to start you off
http://www.coranac.com/tonc/text/asm.htm SevenMachines June 27th, 2012, 08:11 AM Been a year or so, but i think this works? Although personally I recommend setting up a chroot or pbuilder arm environment, its less hassle with more complicated programs, or at least was in my previous experience.
$ apt-get install gcc-4.6-arm-linux-gnueabi libc6-dev-armel-cross
$ cat hello.s
.data
msg:
.ascii "Hello, ARM World!\n"
len = . - msg
.text
.globl _start
_start:
/* write syscall */
mov %r0, $1
ldr %r1, =msg
ldr %r2, =len
mov %r7, $4
swi $0
/* exit syscall */
mov %r0, $0
mov %r7, $1
swi $0
$ arm-linux-gnueabi-as -o hello.o hello.s
$ arm-linux-gnueabi-ld -o hello hello.o
$ file hello
hello: ELF 32-bit LSB executable, ARM, version 1 (SYSV), statically linked, not stripped
$ ./hello
Hello, ARM World! chuchi June 27th, 2012, 06:35 PM Hi!! thank you very much for reply. But that type of instructions is of the form: Mov source,dest. The syntax instructions on ARM is : Mov dest,source. This is what I need
Thank you very much! chuchi June 27th, 2012, 06:49 PM Ok I was wrong, your code is right!! I am very sorry!!
Everything is ok, except when I type ./hello I get
bash: ./hello: cannot execute binary file
Why??
Thank you very much! SevenMachines June 27th, 2012, 07:17 PM Yes. its just at&t syntax versus intel.
Sorry, obviously the binary is arm and not x86 so wont run, I just forgot I had qemu emulation enabled. Try,
$ ./hello
bash: ./hello: cannot execute binary file
# Set up qemu arm emulation
$ sudo apt-get install qemu-user-static
$ ./hello
Hello, ARM World! chuchi June 27th, 2012, 07:25 PM HI!! now it works!! thank you very very much!! chuchi June 28th, 2012, 09:48 AM Hi again!!
Do you know any way of debugging in qemu?
Surfing the net they say you have to install and configure a new kernel. Is there any other way??
thank you very much!! SevenMachines June 28th, 2012, 11:21 PM You can set qemu to wait on a gdb connection
# In a terminal
$ qemu-arm-static -g 10101 ./hello
# In a new terminal
$ sudo apt-get install gdb-multiarch
Then start gdb-multiarch, load symbols, and connect gdb to qemu, eg
$gdb-multiarch
(gdb) list _start
8 .text
9
10 .globl _start
11 _start:
12 /* write syscall */
13 mov %r0, $1
14 ldr %r1, =msg
15 ldr %r2, =len
16 mov %r7, $4
17 swi $0
(gdb) b 16
Breakpoint 1 at 0x8080: file hello.s, line 16.
(gdb) target remote :10101
Remote debugging using :10101
[New Remote target]
[Switching to Remote target]
_start () at hello.s:13
13 mov %r0, $1
(gdb) c
Continuing.
Breakpoint 1, _start () at hello.s:16
16 mov %r7, $4
(gdb) n
17 swi $0
(gdb) n
20 mov %r0, $0
(gdb) c
Continuing.
[Inferior 1 (Remote target) exited normally]
[EDIT] You'll want debugging information ie
$ arm-linux-gnueabi-as -gstabs -o hello.o hello.s
<script>window._bd_share_config={"common":{"bdSnsKey":{},"bdText":"","bdMini":"2","bdMiniList":false,"bdPic":"","bdStyle":"0","bdSize":"16"},"share":{}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)];</script>
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