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authorDavid S. Miller <davem@sunset.davemloft.net>2007-08-25 15:10:44 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-08-26 18:49:09 -0700
commit6cc0735d0dbf6a0e5f802f47d51e1e463466955c (patch)
tree62840e618992c257eff51c65bfe66a14f5942c9a
parent6c8f5b90bfbe69a27763fb0e181bd2465181446d (diff)
downloadlinux-stericsson-6cc0735d0dbf6a0e5f802f47d51e1e463466955c.tar.gz
[SPARC32]: Add __cmpdi2() libcall implementation ala. MIPS.
Device mapper generates calls to this with recent versions of gcc. Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--arch/sparc/lib/Makefile3
-rw-r--r--arch/sparc/lib/cmpdi2.c27
-rw-r--r--arch/sparc/lib/libgcc.h18
3 files changed, 47 insertions, 1 deletions
diff --git a/arch/sparc/lib/Makefile b/arch/sparc/lib/Makefile
index 9ddc5b9ce3bd..76effdbea075 100644
--- a/arch/sparc/lib/Makefile
+++ b/arch/sparc/lib/Makefile
@@ -8,6 +8,7 @@ lib-y := mul.o rem.o sdiv.o udiv.o umul.o urem.o ashrdi3.o memcpy.o memset.o \
strlen.o checksum.o blockops.o memscan.o memcmp.o strncmp.o \
strncpy_from_user.o divdi3.o udivdi3.o strlen_user.o \
copy_user.o locks.o atomic.o \
- lshrdi3.o ashldi3.o rwsem.o muldi3.o bitext.o
+ lshrdi3.o ashldi3.o rwsem.o muldi3.o bitext.o \
+ cmpdi2.o
obj-y += iomap.o atomic32.o
diff --git a/arch/sparc/lib/cmpdi2.c b/arch/sparc/lib/cmpdi2.c
new file mode 100644
index 000000000000..8c1306437ed1
--- /dev/null
+++ b/arch/sparc/lib/cmpdi2.c
@@ -0,0 +1,27 @@
+#include <linux/module.h>
+
+#include "libgcc.h"
+
+word_type __cmpdi2(long long a, long long b)
+{
+ const DWunion au = {
+ .ll = a
+ };
+ const DWunion bu = {
+ .ll = b
+ };
+
+ if (au.s.high < bu.s.high)
+ return 0;
+ else if (au.s.high > bu.s.high)
+ return 2;
+
+ if ((unsigned int) au.s.low < (unsigned int) bu.s.low)
+ return 0;
+ else if ((unsigned int) au.s.low > (unsigned int) bu.s.low)
+ return 2;
+
+ return 1;
+}
+
+EXPORT_SYMBOL(__cmpdi2);
diff --git a/arch/sparc/lib/libgcc.h b/arch/sparc/lib/libgcc.h
new file mode 100644
index 000000000000..b84fd797f3ea
--- /dev/null
+++ b/arch/sparc/lib/libgcc.h
@@ -0,0 +1,18 @@
+#ifndef __ASM_LIBGCC_H
+#define __ASM_LIBGCC_H
+
+#include <asm/byteorder.h>
+
+typedef int word_type __attribute__ ((mode (__word__)));
+
+struct DWstruct {
+ int high, low;
+};
+
+typedef union
+{
+ struct DWstruct s;
+ long long ll;
+} DWunion;
+
+#endif /* __ASM_LIBGCC_H */