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!!!
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
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! "
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!
$ apt-get install gcc-4.6-arm-linux-gnueabi libc6-dev-armel-cross
$ cat hello.s
.data
msg:
.ascii "Hello, ARM World! "
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!
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!
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!
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!!
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
# 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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