[S390] zcore: CPU registers are not saved under LPAR

[safe/jmp/linux-2.6] / arch / s390 / mm / maccess.c

diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c
index 8175627..a8c2af8 100644 (file)
--- a/arch/s390/mm/maccess.c
+++ b/arch/s390/mm/maccess.c
@@ -59,3 +59,29 @@ long probe_kernel_write(void *dst, void *src, size_t size)
        }
        return copied < 0 ? -EFAULT : 0;
 }
+
+int 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;
+       unsigned long flags;
+       int rc = -EFAULT;
+
+       if (!count)
+               return 0;
+       flags = __raw_local_irq_stnsm(0xf8UL);
+       asm volatile (
+               "0:     mvcle   %1,%2,0x0\n"
+               "1:     jo      0b\n"
+               "       lhi     %0,0x0\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");
+       __raw_local_irq_ssm(flags);
+       return rc;
+}