copy_from_user broken on i386 since 2.5.57

From: Brice Goglin (bgoglin@ens-lyon.fr)
Date: Wed Jan 22 2003 - 13:31:48 EST


Hi,

Trying to compile a very very simple module for 2.5,
I got an error from gcc saying that assembly code
is incorrect.
This problem appeared in 2.5.57 and is still here
in 2.5.59.
I only tried on i386.

Here's a very simple example code :

#define __KERNEL__
#define MODULE
#include "linux/module.h"
#include "asm/uaccess.h"

int func(void *to, const void *from) {
  return __copy_from_user(to, from, 1);
}

Here's gcc report :

mp760:~/tmp% gcc user.c -c -o user.o -Ipath_to_2.5.57/include
/tmp/cceAbcRd.s: Assembler messages:
/tmp/cceAbcRd.s:120: Error: `%al' not allowed with `movl'
/tmp/cceAbcRd.s:124: Error: `%al' not allowed with `xorl'
/tmp/cceAbcRd.s:209: Warning: using `%eax' instead of `%ax' due to `l' suffix
/tmp/cceAbcRd.s:213: Warning: using `%eax' instead of `%ax' due to `l' suffix
/tmp/cceAbcRd.s:213: Warning: using `%eax' instead of `%ax' due to `l' suffix

Regards

Brice Goglin
============
Ph.D Student
Laboratoire de l'Informatique et du ParallÚlisme
ENS Lyon
France
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