linux-kernel - [PATCH] blackfin: lib: ucmpdi2: Add ucmpdi2 from libgcc2

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Date:	Sun, 5 Apr 2015 13:16:44 +0800
From:	Chen Gang <xili_gchen_5257@...mail.com>
To:	"realmz6@...il.com" <realmz6@...il.com>,
	Richard Weinberger <richard.weinberger@...il.com>
CC:	"adi-buildroot-devel@...ts.sourceforge.net" 
	<adi-buildroot-devel@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] blackfin: lib: ucmpdi2: Add ucmpdi2 from libgcc2

Just copy the output of "gcc -S". The related error:

  kernel/built-in.o: In function `perf_swevent_init':
  kernel/events/core.c:(.text+0xa97e4): undefined reference to `__ucmpdi2'
  make: *** [vmlinux] Error 1

Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
---
 arch/blackfin/kernel/bfin_ksyms.c |  2 ++
 arch/blackfin/lib/Makefile        |  2 +-
 arch/blackfin/lib/ucmpdi2.S       | 42 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 45 insertions(+), 1 deletion(-)
 create mode 100644 arch/blackfin/lib/ucmpdi2.S

diff --git a/arch/blackfin/kernel/bfin_ksyms.c b/arch/blackfin/kernel/bfin_ksyms.c
index c446591..7fcfc06 100644
--- a/arch/blackfin/kernel/bfin_ksyms.c
+++ b/arch/blackfin/kernel/bfin_ksyms.c
@@ -60,6 +60,7 @@ extern void __modsi3(void);
 extern void __muldi3(void);
 extern void __udivsi3(void);
 extern void __umodsi3(void);
+extern void __ucmpdi2(void);
 EXPORT_SYMBOL(__ashldi3);
 EXPORT_SYMBOL(__ashrdi3);
 EXPORT_SYMBOL(__umulsi3_highpart);
@@ -70,6 +71,7 @@ EXPORT_SYMBOL(__modsi3);
 EXPORT_SYMBOL(__muldi3);
 EXPORT_SYMBOL(__udivsi3);
 EXPORT_SYMBOL(__umodsi3);
+EXPORT_SYMBOL(__ucmpdi2);
 
 /* Input/output symbols: lib/{in,out}s.S */
 EXPORT_SYMBOL(outsb);
diff --git a/arch/blackfin/lib/Makefile b/arch/blackfin/lib/Makefile
index 42c47dc..c0b6959 100644
--- a/arch/blackfin/lib/Makefile
+++ b/arch/blackfin/lib/Makefile
@@ -4,7 +4,7 @@
 
 lib-y := \
 	ashldi3.o ashrdi3.o lshrdi3.o \
-	muldi3.o divsi3.o udivsi3.o modsi3.o umodsi3.o \
+	muldi3.o divsi3.o udivsi3.o modsi3.o umodsi3.o ucmpdi2.o \
 	memcpy.o memset.o memcmp.o memchr.o memmove.o \
 	strcmp.o strcpy.o strncmp.o strncpy.o \
 	umulsi3_highpart.o smulsi3_highpart.o \
diff --git a/arch/blackfin/lib/ucmpdi2.S b/arch/blackfin/lib/ucmpdi2.S
new file mode 100644
index 0000000..654f34c
--- /dev/null
+++ b/arch/blackfin/lib/ucmpdi2.S
@@ -0,0 +1,42 @@
+/*
+ * libgcc2 routines for Blackfin
+ *
+ * Copyright 2015 Chen Gang
+ *
+ * Licensed under the Clear BSD license or the GPL-2 (or later)
+ */
+
+#ifdef CONFIG_ARITHMETIC_OPS_L1
+.section .l1.text
+#else
+.text
+#endif
+	.align 4
+.global ___ucmpdi2;
+.type ___ucmpdi2, STT_FUNC;
+___ucmpdi2:
+	LINK 0;
+	R3 = ROT R2 BY 0 ||
+	R2 = [FP+20] ||
+	nop;
+	cc =R1<R2 (iu);
+	if cc jump .L5;
+	cc =R1<=R2 (iu);
+	if cc jump .L8;
+	UNLINK;
+	R0 = 2 (X);
+	rts;
+.L8:
+	cc =R0<R3 (iu);
+	if cc jump .L5;
+	cc =R0<=R3 (iu);
+	R1 = 1 (X);
+	R0 = 2 (X);
+	UNLINK;
+	if cc R0 = R1;
+	rts;
+.L5:
+	UNLINK;
+	R0 = 0 (X);
+	rts;
+.size	___ucmpdi2, .-___ucmpdi2
-- 
1.9.3
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