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s390/ap: get rid of register asm in ap_dqap()

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This is the second part of the cleanup for the header file ap.h
to remove the register asm statements. This patch deals with
the inline ap_dqap() function where within the assembler code
an odd register of an register pair is to be addressed.

[hca@linux.ibm.com: this intentionally breaks compilation with any
 clang compilers prior to llvm-project commit 458eac257377 ("[SystemZ]
 Support the 'N' code for the odd register in inline-asm.").
 This is hopefully the last clang kernel compile breakage caused by
 incompatibilities between gcc and clang.]

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Harald Freudenberger 2021-07-05 18:22:56 +02:00 committed by Vasily Gorbik
parent d26a357fe8
commit 4516f355c5
1 changed files with 24 additions and 18 deletions
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42
arch/s390/include/asm/ap.h
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@ -379,28 +379,34 @@ static inline struct ap_queue_status ap_dqap(ap_qid_t qid,
size_t *reslength,
unsigned long *resgr0)
{
register unsigned long reg0 asm("0") =
resgr0 && *resgr0 ? *resgr0 : qid | 0x80000000UL;
register struct ap_queue_status reg1 asm ("1");
register unsigned long reg2 asm("2") = 0UL;
register unsigned long reg4 asm("4") = (unsigned long) msg;
register unsigned long reg5 asm("5") = (unsigned long) length;
register unsigned long reg6 asm("6") = 0UL;
register unsigned long reg7 asm("7") = 0UL;
unsigned long reg0 = resgr0 && *resgr0 ? *resgr0 : qid | 0x80000000UL;
struct ap_queue_status reg1;
unsigned long reg2;
union register_pair rp1, rp2;
rp1.even = 0UL;
rp1.odd = 0UL;
rp2.even = (unsigned long)msg;
rp2.odd = (unsigned long)length;
asm volatile(
"0: ltgr %[bl],%[bl]\n" /* if avail. buf len is 0 then */
" jz 2f\n" /* go out of this asm block */
"1: .long 0xb2ae0064\n" /* DQAP */
" brc 6,0b\n" /* if partially do again */
"2:\n"
: "+d" (reg0), "=d" (reg1), "+d" (reg2),
"+d" (reg4), [bl] "+d" (reg5), "+d" (reg6), "+d" (reg7)
: : "cc", "memory");
" lgr 0,%[reg0]\n" /* qid param into gr0 */
" lghi 2,0\n" /* 0 into gr2 (res length) */
"0: ltgr %N[rp2],%N[rp2]\n" /* check buf len */
" jz 2f\n" /* go out if buf len is 0 */
"1: .insn rre,0xb2ae0000,%[rp1],%[rp2]\n"
" brc 6,0b\n" /* handle partial complete */
"2: lgr %[reg0],0\n" /* gr0 (qid + info) into reg0 */
" lgr %[reg1],1\n" /* gr1 (status) into reg1 */
" lgr %[reg2],2\n" /* gr2 (res length) into reg2 */
: [reg0] "+&d" (reg0), [reg1] "=&d" (reg1), [reg2] "=&d" (reg2),
[rp1] "+&d" (rp1.pair), [rp2] "+&d" (rp2.pair)
:
: "cc", "memory", "0", "1", "2");
if (reslength)
*reslength = reg2;
if (reg2 != 0 && reg5 == 0) {
if (reg2 != 0 && rp2.odd == 0) {
/*
* Partially complete, status in gr1 is not set.
* Signal the caller that this dqap is only partially received
@ -410,7 +416,7 @@ static inline struct ap_queue_status ap_dqap(ap_qid_t qid,
if (resgr0)
*resgr0 = reg0;
} else {
*psmid = (((unsigned long long) reg6) << 32) + reg7;
*psmid = (((unsigned long long)rp1.even) << 32) + rp1.odd;
if (resgr0)
*resgr0 = 0;
}