[PATCH v9 02/22] s390/zcrypt: Review inline assembler constraints.

Tony Krowiak
2018-08-13T21:47:59Z

From: Harald Freudenberger <freude@de.ibm.com>

Reviewed and adapted the register use and asm constraints
of the C inline assembler functions in accordance to the
the AP instructions specifications.

Signed-off-by: Harald Freudenberger <freude@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
---
drivers/s390/crypto/ap_asm.h | 40 +++++++++++++++++++++++-----------------
1 files changed, 23 insertions(+), 17 deletions(-)

diff --git a/drivers/s390/crypto/ap_asm.h b/drivers/s390/crypto/ap_asm.h
index b22d30a..e22ee12 100644
--- a/drivers/s390/crypto/ap_asm.h
+++ b/drivers/s390/crypto/ap_asm.h
@@ -20,14 +20,16 @@ static inline int ap_instructions_available(void)
{
register unsigned long reg0 asm ("0") = AP_MKQID(0, 0);
register unsigned long reg1 asm ("1") = -ENODEV;
- register unsigned long reg2 asm ("2") = 0UL;
+ register unsigned long reg2 asm ("2");

asm volatile(
" .long 0xb2af0000\n" /* PQAP(TAPQ) */
- "0: la %1,0\n"
+ "0: la %0,0\n"
"1:\n"
EX_TABLE(0b, 1b)
- : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc");
+ : "+d" (reg1), "=d" (reg2)
+ : "d" (reg0)
+ : "cc");
return reg1;
}

@@ -42,10 +44,12 @@ static inline struct ap_queue_status ap_tapq(ap_qid_t qid, unsigned long *info)
{
register unsigned long reg0 asm ("0") = qid;
register struct ap_queue_status reg1 asm ("1");
- register unsigned long reg2 asm ("2") = 0UL;
+ register unsigned long reg2 asm ("2");

asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */
- : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
+ : "=d" (reg1), "=d" (reg2)
+ : "d" (reg0)
+ : "cc");
if (info)
*info = reg2;
return reg1;
@@ -59,13 +63,14 @@ static inline struct ap_queue_status ap_tapq(ap_qid_t qid, unsigned long *info)
*/
static inline struct ap_queue_status ap_rapq(ap_qid_t qid)
{
- register unsigned long reg0 asm ("0") = qid | 0x01000000UL;
+ register unsigned long reg0 asm ("0") = qid | (1UL << 24);
register struct ap_queue_status reg1 asm ("1");
- register unsigned long reg2 asm ("2") = 0UL;

asm volatile(
".long 0xb2af0000" /* PQAP(RAPQ) */
- : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
+ : "=d" (reg1)
+ : "d" (reg0)
+ : "cc");
return reg1;
}

@@ -107,8 +112,8 @@ static inline struct ap_queue_status ap_aqic(ap_qid_t qid,

asm volatile(
".long 0xb2af0000" /* PQAP(AQIC) */
- : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2)
- :
+ : "=d" (reg1_out)
+ : "d" (reg0), "d" (reg1_in), "d" (reg2)
: "cc");
return reg1_out;
}
@@ -120,17 +125,17 @@ static inline struct ap_queue_status ap_aqic(ap_qid_t qid,
*/
static inline int ap_qci(void *config)
{
- register unsigned long reg0 asm ("0") = 0x04000000UL;
+ register unsigned long reg0 asm ("0") = 4UL << 24;
register unsigned long reg1 asm ("1") = -EINVAL;
register void *reg2 asm ("2") = (void *) config;

asm volatile(
".long 0xb2af0000\n" /* PQAP(QCI) */
- "0: la %1,0\n"
+ "0: la %0,0\n"
"1:\n"
EX_TABLE(0b, 1b)
- : "+d" (reg0), "+d" (reg1), "+d" (reg2)
- :
+ : "+d" (reg1)
+ : "d" (reg0), "d" (reg2)
: "cc", "memory");

return reg1;
@@ -169,12 +174,13 @@ static inline struct ap_queue_status ap_qact(ap_qid_t qid, int ifbit,
| ((ifbit & 0x01) << 22);
register unsigned long reg1_in asm ("1") = apinfo->val;
register struct ap_queue_status reg1_out asm ("1");
- register unsigned long reg2 asm ("2") = 0;
+ register unsigned long reg2 asm ("2");

asm volatile(
".long 0xb2af0000" /* PQAP(QACT) */
- : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2)
- : : "cc");
+ : "+d" (reg1_in), "=d" (reg1_out), "=d" (reg2)
+ : "d" (reg0)
+ : "cc");
apinfo->val = reg2;
return reg1_out;
}
--
1.7.1