Commit 53a0868c authored by Michael Holzheu's avatar Michael Holzheu Committed by Martin Schwidefsky
Browse files

[S390] zcore: fix inline assembly in memcpy_real()

memcpy_real uses the mvcle instruction. This instruction alters all used
registers (source, destination and 2 x count). Therefore we have to flag
those registers as input/output registers (+d). In addition to that, we
have to specify, that we read from memory designated by "src" and write to
memory designated by "dest".
Signed-off-by: default avatarMichael Holzheu <>
Signed-off-by: default avatarMartin Schwidefsky <>
parent cebe0fe7
......@@ -141,15 +141,16 @@ static int memcpy_real(void *dest, unsigned long src, size_t count)
if (count == 0)
return 0;
flags = __raw_local_irq_stnsm(0xf8); /* switch to real mode */
flags = __raw_local_irq_stnsm(0xf8UL); /* switch to real mode */
asm volatile (
"0: mvcle %1,%2,0x0\n"
"1: jo 0b\n"
" lhi %0,0x0\n"
: "+d" (rc)
: "d" (_dest), "d" (_src), "d" (_len1), "d" (_len2)
: "+d" (rc), "+d" (_dest), "+d" (_src), "+d" (_len1),
"+d" (_len2), "=m" (*((long*)dest))
: "m" (*((long*)src))
: "cc", "memory");
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