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s390/maccess: use register pair instead of register asm 

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-06-09 22:59:13 +02:00 committed by Vasily Gorbik
parent a29a6b5a92
commit dda74578e7
1 changed files with 9 additions and 10 deletions
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19
arch/s390/mm/maccess.c
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@ -79,22 +79,21 @@ notrace void *s390_kernel_write(void *dst, const void *src, size_t size)
static int __no_sanitize_address __memcpy_real(void *dest, void *src, size_t count)
{
register unsigned long _dest asm("2") = (unsigned long) dest;
register unsigned long _len1 asm("3") = (unsigned long) count;
register unsigned long _src asm("4") = (unsigned long) src;
register unsigned long _len2 asm("5") = (unsigned long) count;
union register_pair _dst, _src;
int rc = -EFAULT;
_dst.even = (unsigned long) dest;
_dst.odd = (unsigned long) count;
_src.even = (unsigned long) src;
_src.odd = (unsigned long) count;
asm volatile (
"0: mvcle %1,%2,0x0\n"
"0: mvcle %[dst],%[src],0\n"
"1: jo 0b\n"
" lhi %0,0x0\n"
" lhi %[rc],0\n"
"2:\n"
EX_TABLE(1b,2b)
: "+d" (rc), "+d" (_dest), "+d" (_src), "+d" (_len1),
"+d" (_len2), "=m" (*((long *) dest))
: "m" (*((long *) src))
: "cc", "memory");
: [rc] "+&d" (rc), [dst] "+&d" (_dst.pair), [src] "+&d" (_src.pair)
: : "cc", "memory");
return rc;
}