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authorPaul Mackerras <paulus@samba.org>2008-03-13 09:39:55 +1100
committerPaul Mackerras <paulus@samba.org>2008-03-13 09:39:55 +1100
commit95ff54f5176a36f65522e46c670a571728328b10 (patch)
treeab569ddca890ff70c4770e4376f119355c042695
parent9cf7f7fac8c36e54e4869fc01e1bad0d3b4de53b (diff)
[POWERPC] Add __ucmpdi2 for 64-bit comparisons in 32-bit kernels
Some drivers (such as V4L2) have code that causes gcc to generate calls to __ucmpdi2 when compiling for 32-bit powerpc, which results in either a link-time error or a module that can't be loaded, as we don't currently have a __ucmpdi2. This adds one so these drivers can be used. Signed-off-by: Paul Mackerras <paulus@samba.org>
-rw-r--r--arch/powerpc/kernel/misc_32.S15
-rw-r--r--arch/powerpc/kernel/ppc_ksyms.c2
2 files changed, 17 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index 5c2e253ddfb1..9d2c56621f1e 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -785,6 +785,21 @@ _GLOBAL(__lshrdi3)
or r4,r4,r7 # LSW |= t2
blr
+/*
+ * 64-bit comparison: __ucmpdi2(u64 a, u64 b)
+ * Returns 0 if a < b, 1 if a == b, 2 if a > b.
+ */
+_GLOBAL(__ucmpdi2)
+ cmplw r3,r5
+ li r3,1
+ bne 1f
+ cmplw r4,r6
+ beqlr
+1: li r3,0
+ bltlr
+ li r3,2
+ blr
+
_GLOBAL(abs)
srawi r4,r3,31
xor r3,r3,r4
diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c
index aa9ff35b0e63..3e52122c5073 100644
--- a/arch/powerpc/kernel/ppc_ksyms.c
+++ b/arch/powerpc/kernel/ppc_ksyms.c
@@ -149,6 +149,8 @@ long long __lshrdi3(long long, int);
EXPORT_SYMBOL(__ashrdi3);
EXPORT_SYMBOL(__ashldi3);
EXPORT_SYMBOL(__lshrdi3);
+int __ucmpdi2(unsigned long long, unsigned long long);
+EXPORT_SYMBOL(__ucmpdi2);
#endif
EXPORT_SYMBOL(memcpy);