------- Comment #4 from segher at kernel dot crashing dot org 2007-09-30 14:07 ------- The original code is: (arch/i386/lib/usercopy.c):
/* Generic arbitrary sized copy. */ #define __copy_user(to,from,size) \ do { \ int __d0, __d1, __d2; \ __asm__ __volatile__( \ " cmp $7,%0\n" \ " jbe 1f\n" \ " movl %1,%0\n" \ " negl %0\n" \ " andl $7,%0\n" \ " subl %0,%3\n" \ "4: rep; movsb\n" \ " movl %3,%0\n" \ " shrl $2,%0\n" \ " andl $3,%3\n" \ " .align 2,0x90\n" \ "0: rep; movsl\n" \ " movl %3,%0\n" \ "1: rep; movsb\n" \ "2:\n" \ ".section .fixup,\"ax\"\n" \ "5: addl %3,%0\n" \ " jmp 2b\n" \ "3: lea 0(%3,%0,4),%0\n" \ " jmp 2b\n" \ ".previous\n" \ ".section __ex_table,\"a\"\n" \ " .align 4\n" \ " .long 4b,5b\n" \ " .long 0b,3b\n" \ " .long 1b,2b\n" \ ".previous" \ : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \ : "3"(size), "0"(size), "1"(to), "2"(from) \ : "memory"); \ } while (0) -- segher at kernel dot crashing dot org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |segher at kernel dot | |crashing dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33600