linux-kernel - Re: sparc64 gcc 7.1 compile error

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Message-Id: <20170605.143100.1613465160039991726.davem@davemloft.net>
Date:   Mon, 05 Jun 2017 14:31:00 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     wbx@...nadk.org
Cc:     linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: sparc64 gcc 7.1 compile error

From: Waldemar Brodkorb <wbx@...nadk.org>
Date: Mon, 5 Jun 2017 11:19:41 +0200

> I get a compile/linking error with gcc 7.1 when targeting qemu system
> sparc64.

This should fix the problem, please let me know if it works for you:

====================
>From 1b4af13ff2cc6897557bb0b8d9e2fad4fa4d67aa Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@...emloft.net>
Date: Mon, 5 Jun 2017 11:28:57 -0700
Subject: [PATCH] sparc64: Add __multi3 for gcc 7.x and later.

Reported-by: Waldemar Brodkorb <wbx@...nadk.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
---
 arch/sparc/lib/Makefile |  1 +
 arch/sparc/lib/multi3.S | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 arch/sparc/lib/multi3.S

diff --git a/arch/sparc/lib/Makefile b/arch/sparc/lib/Makefile
index 69912d2..07c03e7 100644
--- a/arch/sparc/lib/Makefile
+++ b/arch/sparc/lib/Makefile
@@ -15,6 +15,7 @@ lib-$(CONFIG_SPARC32) += copy_user.o locks.o
 lib-$(CONFIG_SPARC64) += atomic_64.o
 lib-$(CONFIG_SPARC32) += lshrdi3.o ashldi3.o
 lib-$(CONFIG_SPARC32) += muldi3.o bitext.o cmpdi2.o
+lib-$(CONFIG_SPARC64) += multi3.o
 
 lib-$(CONFIG_SPARC64) += copy_page.o clear_page.o bzero.o
 lib-$(CONFIG_SPARC64) += csum_copy.o csum_copy_from_user.o csum_copy_to_user.o
diff --git a/arch/sparc/lib/multi3.S b/arch/sparc/lib/multi3.S
new file mode 100644
index 0000000..d6b6c97
--- /dev/null
+++ b/arch/sparc/lib/multi3.S
@@ -0,0 +1,35 @@
+#include <linux/linkage.h>
+#include <asm/export.h>
+
+	.text
+	.align	4
+ENTRY(__multi3) /* %o0 = u, %o1 = v */
+	mov	%o1, %g1
+	srl	%o3, 0, %g4
+	mulx	%g4, %g1, %o1
+	srlx	%g1, 0x20, %g3
+	mulx	%g3, %g4, %g5
+	sllx	%g5, 0x20, %o5
+	srl	%g1, 0, %g4
+	sub	%o1, %o5, %o5
+	srlx	%o5, 0x20, %o5
+	addcc	%g5, %o5, %g5
+	srlx	%o3, 0x20, %o5
+	mulx	%g4, %o5, %g4
+	mulx	%g3, %o5, %o5
+	sethi	%hi(0x80000000), %g3
+	addcc	%g5, %g4, %g5
+	srlx	%g5, 0x20, %g5
+	add	%g3, %g3, %g3
+	movcc	%xcc, %g0, %g3
+	addcc	%o5, %g5, %o5
+	sllx	%g4, 0x20, %g4
+	add	%o1, %g4, %o1
+	add	%o5, %g3, %g2
+	mulx	%g1, %o2, %g1
+	add	%g1, %g2, %g1
+	mulx	%o0, %o3, %o0
+	retl
+	 add	%g1, %o0, %o0
+ENDPROC(__multi3)
+EXPORT_SYMBOL(__multi3)
-- 
2.1.2.532.g19b5d50