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[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>
This commit is contained in:
Paul Mackerras 2008-03-13 09:39:55 +11:00
parent 9cf7f7fac8
commit 95ff54f517
2 changed files with 17 additions and 0 deletions
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15
arch/powerpc/kernel/misc_32.S
View File

@ -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

2
arch/powerpc/kernel/ppc_ksyms.c
View File

@ -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);