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Add a __ucmpdi2 implementation

PATCH New Thiemo Seufer 1 participant 1 message May 1, 2007 MIPS

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Thiemo Seufer

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PATCH 1/1 Add a __ucmpdi2 implementation

Hello All,

this patch adds a __ucmpdi2 implementation, recent GCC SVN versions generate calls to it from some of the FPU emulator functions.

Tested by building and booting a little endian qemu MIPS kernel.

Thiemo

Signed-off-by Thiemo Seufer <[email protected]>
arch/mips/lib/Makefile +1 -1
index d7d3b14..5dad13e 100644
@@ -9,4 +9,4 @@ obj-y			+= iomap.o
 obj-$(CONFIG_PCI)	+= iomap-pci.o
 
 # libgcc-style stuff needed in the kernel
-lib-y += ashldi3.o ashrdi3.o lshrdi3.o
+lib-y += ashldi3.o ashrdi3.o lshrdi3.o ucmpdi2.o
arch/mips/lib/ucmpdi2.c new file +19 -0
new file mode 100644
index 0000000..e9ff258
@@ -0,0 +1,19 @@
+#include <linux/module.h>
+
+#include "libgcc.h"
+
+word_type __ucmpdi2 (unsigned long a, unsigned long b)
+{
+	const DWunion au = {.ll = a};
+	const DWunion bu = {.ll = b};
+
+	if ((unsigned int) au.s.high < (unsigned int) bu.s.high)
+		return 0;
+	else if ((unsigned int) au.s.high > (unsigned int) 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;
+}