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From: Claudio Imbrenda <imbrenda@linux.ibm.com>
To: kvm@vger.kernel.org
Cc: linux-s390@vger.kernel.org, thuth@redhat.com, david@redhat.com,
	borntraeger@de.ibm.com, frankja@linux.ibm.com
Subject: [kvm-unit-tests PATCH v7 3/4] s390x: lib: add SPX and STPX instruction wrapper
Date: Fri, 10 Jan 2020 19:40:49 +0100	[thread overview]
Message-ID: <20200110184050.191506-4-imbrenda@linux.ibm.com> (raw)
In-Reply-To: <20200110184050.191506-1-imbrenda@linux.ibm.com>

Add a wrapper for the SET PREFIX and STORE PREFIX instructions, and
use it instead of using inline assembly.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---
 lib/s390x/asm/arch_def.h | 13 +++++++++++++
 s390x/intercept.c        | 23 ++++++++---------------
 2 files changed, 21 insertions(+), 15 deletions(-)

diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h
index 1a5e3c6..15a4d49 100644
--- a/lib/s390x/asm/arch_def.h
+++ b/lib/s390x/asm/arch_def.h
@@ -284,4 +284,17 @@ static inline int servc(uint32_t command, unsigned long sccb)
 	return cc;
 }
 
+static inline void set_prefix(uint32_t new_prefix)
+{
+	asm volatile("	spx %0" : : "Q" (new_prefix) : "memory");
+}
+
+static inline uint32_t get_prefix(void)
+{
+	uint32_t current_prefix;
+
+	asm volatile("	stpx %0" : "=Q" (current_prefix));
+	return current_prefix;
+}
+
 #endif
diff --git a/s390x/intercept.c b/s390x/intercept.c
index 3696e33..cd96121 100644
--- a/s390x/intercept.c
+++ b/s390x/intercept.c
@@ -26,13 +26,10 @@ static void test_stpx(void)
 	uint32_t new_prefix = (uint32_t)(intptr_t)pagebuf;
 
 	/* Can we successfully change the prefix? */
-	asm volatile (
-		" stpx	%0\n"
-		" spx	%2\n"
-		" stpx	%1\n"
-		" spx	%0\n"
-		: "+Q"(old_prefix), "+Q"(tst_prefix)
-		: "Q"(new_prefix));
+	old_prefix = get_prefix();
+	set_prefix(new_prefix);
+	tst_prefix = get_prefix();
+	set_prefix(old_prefix);
 	report(old_prefix == 0 && tst_prefix == new_prefix, "store prefix");
 
 	expect_pgm_int();
@@ -63,14 +60,10 @@ static void test_spx(void)
 	 * some facility bits there ... at least some of them should be
 	 * set in our buffer afterwards.
 	 */
-	asm volatile (
-		" stpx	%0\n"
-		" spx	%1\n"
-		" stfl	0\n"
-		" spx	%0\n"
-		: "+Q"(old_prefix)
-		: "Q"(new_prefix)
-		: "memory");
+	old_prefix = get_prefix();
+	set_prefix(new_prefix);
+	asm volatile("	stfl 0" : : : "memory");
+	set_prefix(old_prefix);
 	report(pagebuf[GEN_LC_STFL] != 0, "stfl to new prefix");
 
 	expect_pgm_int();
-- 
2.24.1


  parent reply	other threads:[~2020-01-10 18:41 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-10 18:40 [kvm-unit-tests PATCH v7 0/4] s390x: SCLP Unit test Claudio Imbrenda
2020-01-10 18:40 ` [kvm-unit-tests PATCH v7 1/4] s390x: export sclp_setup_int Claudio Imbrenda
2020-01-10 18:40 ` [kvm-unit-tests PATCH v7 2/4] s390x: sclp: add service call instruction wrapper Claudio Imbrenda
2020-01-10 18:40 ` Claudio Imbrenda [this message]
2020-01-13  9:42   ` [kvm-unit-tests PATCH v7 3/4] s390x: lib: add SPX and STPX " Janosch Frank
2020-01-13 12:27     ` Claudio Imbrenda
2020-01-13 10:42   ` David Hildenbrand
2020-01-10 18:40 ` [kvm-unit-tests PATCH v7 4/4] s390x: SCLP unit test Claudio Imbrenda
2020-01-13 11:00   ` David Hildenbrand
2020-01-13 12:33     ` Claudio Imbrenda
2020-01-13 12:48       ` David Hildenbrand
2020-01-13 12:58         ` Claudio Imbrenda
2020-01-13 13:10           ` David Hildenbrand
2020-01-13 14:05             ` Claudio Imbrenda
2020-01-13 14:43               ` David Hildenbrand
2020-01-13 15:24                 ` Claudio Imbrenda
2020-01-13 16:06                   ` David Hildenbrand
2020-01-13 16:17                     ` Claudio Imbrenda
2020-01-15  9:57                       ` David Hildenbrand

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