Messages in this thread | | | Date | Thu, 17 Jun 2004 11:30:31 -0700 | From | Chris Jones <> | Subject | Problems during assembly of Kernel Module. |
| |
Hello all;
After quite some effort investigation and discussion on the crossgcc mailing group.
I decided to bring my problem here.
I am trying to compile a kernel module for a mips32 chip.
I am having problems with the <asm/uaccess.h> (asm-mips/uaccess) inline assembly routines for both get_user() and put_user().
Both of these generate inline assembly. In specific a line:
j 2b
My mips compiler does not like this very much and complains loudly:
/tmp/ccw6NzZv.s: Assembler messages: /tmp/ccw6NzZv.s:128: Error: Cannot branch to symbol in another section.
This program seems to compile FINE on x86 since the x86 assembly seems to have been re-written and put in arch/i386/lib/getuser.S and the functions __get_user() in <asm-x86/uaccess.h> seems to be obsolete.
I have included a sample module using one of these calls to demonstrate the problem. I have tried several different cross-compilers and one native mips compiler all giving the same complaint on the "j 2b" instruction.
I am definitely NOT a kernel module expert, but have done my best to track down the problem and give a sample program.
Any help would be much appreciated.
Cheers,
-=chris
x86 -> x86: ------------- gcc -I/location_of_my_kernel_includes -DMODULE -D__KERNEL__ -c moduletest.c
x86 -> mips: ------------- mipsel-unknown-linux-gnu-gcc -I/location_of_my_kernel_includes -DMODULE -D__KERNEL__ -mips32 -c moduletest.c
mips -> mips: ------------- gcc -I/location_of_my_kernel_inclues -mips32 -DMODULE -D__KERNEL__ -c moduletest.c
#include <linux/kernel.h> #include <linux/module.h>
#include <linux/ppp_channel.h>
int init_module() { int j=1; unsigned long data; int foo = 1024; data = &foo; //OFFENDING k_call -> get_user() : See <asm/uaccess.h> // Generates "j 2b" assembly get_user(j,(int *)data); return 0; }
void cleanup_module() { }
-- Chris Jones | Software Developer | Sutus, Inc. t: +1.604.987.8866 x 2204 | e: cjones@sutus.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |