Compile binary for testing linux kernel exploit for arm architecture - Android

Hi,
i'm an android app developer. I have an HTC Desire and I would test kernel issue for root my device.
For check kernel or software issue, I compile on my linuxbox (on Intel) and binary file run in the same arch that compile it.
In an arm device like my android phone, how can I compile c source file?
We will say: "With an arm croos toolchain!"...
I have read http://www.hermann-uwe.de/blog/buil...-with-binutils-gcc-newlib-and-gdb-from-source that explain how to build the toolchain, but binary compiler that this steps create not compile a simple "Hello World" program:
Code:
#include <stdio.h>
int main() {
printf("Hello, World!");
return 0;
}
because not have stdio.h header... O_O
So I have downloaded the GNU ARM toolchain binary for linux, but the compiler don't work because I can't run it on my linuxbox...
Why?
mmm... So I have copied the "include" directory from GNU Arm ToolChain to toolchain compiled from source (how explaine the link above).
now stdio.h is present but...
Code:
/tmp/ccfmzOMU.s: Assembler messages:
/tmp/ccfmzOMU.s:11: Error: junk at end of line, first unrecognized character is `@'
/tmp/ccfmzOMU.s:12: Error: junk at end of line, first unrecognized character is `@'
/tmp/ccfmzOMU.s:13: Error: too many memory references for `mov'
/tmp/ccfmzOMU.s:14: Error: no such instruction: `stmfd sp!,{fp,ip,lr,pc}'
/tmp/ccfmzOMU.s:15: Error: too many memory references for `sub'
/tmp/ccfmzOMU.s:16: Error: no such instruction: `ldr r0,.L3'
/tmp/ccfmzOMU.s:17: Error: no such instruction: `bl printf'
/tmp/ccfmzOMU.s:18: Error: expecting operand after ','; got nothing
/tmp/ccfmzOMU.s:19: Error: too many memory references for `mov'
/tmp/ccfmzOMU.s:20: Error: no such instruction: `ldmfd sp,{fp,sp,pc}'
How can i build binary elf file for my Desire architecture?
Thanks in andvance!

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I am unable to link to any resources here due to them being behind a corporate firewall, but this link I found might help:
http://www.ibm.com/developerworks/linux/library/l-arm-toolchain/index.html
Here is a link to the tools:
http://www.codesourcery.com/sgpp/lite/arm/portal/[email protected]=lite
Let me know if this is not what you are looking for.

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Yes, this is what I need.
Thanks!
Now I've tried to compile my hello world in C for ARM, but the binary not run on my desire... I think that I have compiled with a mistake mcpu parameter.
The result is that if I copy helloworld binary in /data/local path in my Desire, set execution permission and execute the program:
Code:
$ ./helloworld
./helloworld
./helloworld: not found
the output of 'ls -l' command show that helloworld file exist and have 'x' permission...
So I think that is an incompatibily issue of the binary file...
Which one "-mcpu" value is correct for the Qualcomm Snapdragon QSD8250 inside HTC Desire?
I've tried any arm7* but it's the same... "not found".
Any ideas?

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@azatoth
I get the same on my hero. Tried to run it on a other arm device (Linksys NSLU2) the same "not found" appears

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mopodo said:
@azatoth
I get the same on my hero. Tried to run it on a other arm device (Linksys NSLU2) the same "not found" appears
Click to expand...
Click to collapse
Do you have found a solution for that?

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I have no real way to test this, but the Snapdragon is a Cortex-A8 I believe... Try the following:
Code:
-mcpu=cortex-a8 -mfpu=neon
I hope this works, let me know if the behavior changes...

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Vermithrax said:
I have no real way to test this, but the Snapdragon is a Cortex-A8 I believe... Try the following:
Code:
-mcpu=cortex-a8 -mfpu=neon
I hope this works, let me know if the behavior changes...
Click to expand...
Click to collapse
don't work yet... the response is always the same: not found...

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you are linking to the wrong libc, you have to link to bionic... Are you using the full android build compiler?