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!!!
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
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.
Code:$ 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!
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!
Ok I was wrong, your code is right!! I am very sorry!!
Everything is ok, except when I type ./hello I get
Why??Code:bash: ./hello: cannot execute binary file
Thank you very much!
Last edited by chuchi; June 27th, 2012 at 06:54 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,
Code:$ ./hello bash: ./hello: cannot execute binary file # Set up qemu arm emulation $ sudo apt-get install qemu-user-static $ ./hello Hello, ARM World!
HI!! now it works!! thank you very very much!!
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!!
You can set qemu to wait on a gdb connection
Code:# In a terminal $ qemu-arm-static -g 10101 ./helloThen start gdb-multiarch, load symbols, and connect gdb to qemu, egCode:# In a new terminal $ sudo apt-get install gdb-multiarch
[EDIT] You'll want debugging information ieCode:$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]
$ arm-linux-gnueabi-as -gstabs -o hello.o hello.s
Last edited by SevenMachines; June 29th, 2012 at 12:18 AM.
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