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

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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: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu 2007-10-12 16:11:44 +02:00 committed by Martin Schwidefsky
parent cebe0fe70f
commit 53a0868cb4
1 changed files with 4 additions and 3 deletions
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7
drivers/s390/char/zcore.c
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@ -141,15 +141,16 @@ static int memcpy_real(void *dest, unsigned long src, size_t count)
if (count == 0) if (count == 0)
return 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 ( asm volatile (
"0: mvcle %1,%2,0x0\n" "0: mvcle %1,%2,0x0\n"
"1: jo 0b\n" "1: jo 0b\n"
" lhi %0,0x0\n" " lhi %0,0x0\n"
"2:\n" "2:\n"
EX_TABLE(1b,2b) EX_TABLE(1b,2b)
: "+d" (rc) : "+d" (rc), "+d" (_dest), "+d" (_src), "+d" (_len1),
: "d" (_dest), "d" (_src), "d" (_len1), "d" (_len2) "+d" (_len2), "=m" (*((long*)dest))
: "m" (*((long*)src))
: "cc", "memory"); : "cc", "memory");
__raw_local_irq_ssm(flags); __raw_local_irq_ssm(flags);