powerpc: Provide __bswapdi2

Some versions of GCC apparently expect this to be provided by libgcc.

Updates from Mikey to fix 32 bit version and adding "r" to registers.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

3 files changed, 24 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index 19e096bd0e73..e469f30e6eeb 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -657,6 +657,17 @@ _GLOBAL(__ucmpdi2)
         li      r3,2
         blr
 
+_GLOBAL(__bswapdi2)
+        rotlwi  r9,r4,8
+        rotlwi  r10,r3,8
+        rlwimi  r9,r4,24,0,7
+        rlwimi  r10,r3,24,0,7
+        rlwimi  r9,r4,24,16,23
+        rlwimi  r10,r3,24,16,23
+        mr      r3,r9
+        mr      r4,r10
+        blr
+
 _GLOBAL(abs)
         srawi   r4,r3,31
         xor     r3,r3,r4
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index 5cfa8008693b..6820e45f557b 100644
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -234,6 +234,17 @@ _GLOBAL(__flush_dcache_icache)
         isync
         blr
 
+_GLOBAL(__bswapdi2)
+        srdi    r8,r3,32
+        rlwinm  r7,r3,8,0xffffffff
+        rlwimi  r7,r3,24,0,7
+        rlwinm  r9,r8,8,0xffffffff
+        rlwimi  r7,r3,24,16,23
+        rlwimi  r9,r8,24,0,7
+        rlwimi  r9,r8,24,16,23
+        sldi    r7,r7,32
+        or      r3,r7,r9
+        blr
 
 #if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_MAPLE)
 /*
diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c
index 78b8766fd79e..c29666586998 100644
--- a/arch/powerpc/kernel/ppc_ksyms.c
+++ b/arch/powerpc/kernel/ppc_ksyms.c
@@ -143,7 +143,8 @@ EXPORT_SYMBOL(__lshrdi3);
 int __ucmpdi2(unsigned long long, unsigned long long);
 EXPORT_SYMBOL(__ucmpdi2);
 #endif
-
+long long __bswapdi2(long long);
+EXPORT_SYMBOL(__bswapdi2);
 EXPORT_SYMBOL(memcpy);
 EXPORT_SYMBOL(memset);
 EXPORT_SYMBOL(memmove);