powerpc: Fix module building for gcc 4.5 and 64 bit

Gcc 4.5 is now generating out of line register save and restore
in the function prefix and postfix when we use -Os.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

3 files changed, 133 insertions, 4 deletions

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 42dcd3f4ad7b..77cfe7a29e25 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -92,10 +92,10 @@ endif
 else
         KBUILD_CFLAGS += $(call cc-option,-mtune=power4)
 endif
-else
-LDFLAGS_MODULE  += arch/powerpc/lib/crtsavres.o
 endif
 
+LDFLAGS_MODULE  += arch/powerpc/lib/crtsavres.o
+
 ifeq ($(CONFIG_TUNE_CELL),y)
         KBUILD_CFLAGS += $(call cc-option,-mtune=cell)
 endif
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index 3040dac18a37..111da1c03a11 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -12,8 +12,8 @@ CFLAGS_REMOVE_code-patching.o = -pg
 CFLAGS_REMOVE_feature-fixups.o = -pg
 
 obj-y                   := string.o alloc.o \
-                           checksum_$(CONFIG_WORD_SIZE).o
-obj-$(CONFIG_PPC32)     += div64.o copy_32.o crtsavres.o
+                           checksum_$(CONFIG_WORD_SIZE).o crtsavres.o
+obj-$(CONFIG_PPC32)     += div64.o copy_32.o
 obj-$(CONFIG_HAS_IOMEM) += devres.o
 
 obj-$(CONFIG_PPC64)     += copypage_64.o copyuser_64.o \
diff --git a/arch/powerpc/lib/crtsavres.S b/arch/powerpc/lib/crtsavres.S
index 70a9cd8a3008..1c893f05d224 100644
--- a/arch/powerpc/lib/crtsavres.S
+++ b/arch/powerpc/lib/crtsavres.S
@@ -6,6 +6,7 @@
  *   Written By Michael Meissner
  *
  * Based on gcc/config/rs6000/crtsavres.asm from gcc
+ * 64 bit additions from reading the PPC elf64abi document.
  *
  * This file is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -44,6 +45,8 @@
 
 #ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 
+#ifndef CONFIG_PPC64
+
 /* Routines for saving integer registers, called by the compiler.  */
 /* Called with r11 pointing to the stack header word of the caller of the */
 /* function, just beyond the end of the integer save area.  */
@@ -226,4 +229,130 @@ _GLOBAL(_rest32gpr_31_x)
         mtlr    0
         mr      1,11
         blr
+
+#else /* CONFIG_PPC64 */
+
+.globl  _savegpr0_14
+_savegpr0_14:
+        std     r14,-144(r1)
+.globl  _savegpr0_15
+_savegpr0_15:
+        std     r15,-136(r1)
+.globl  _savegpr0_16
+_savegpr0_16:
+        std     r16,-128(r1)
+.globl  _savegpr0_17
+_savegpr0_17:
+        std     r17,-120(r1)
+.globl  _savegpr0_18
+_savegpr0_18:
+        std     r18,-112(r1)
+.globl  _savegpr0_19
+_savegpr0_19:
+        std     r19,-104(r1)
+.globl  _savegpr0_20
+_savegpr0_20:
+        std     r20,-96(r1)
+.globl  _savegpr0_21
+_savegpr0_21:
+        std     r21,-88(r1)
+.globl  _savegpr0_22
+_savegpr0_22:
+        std     r22,-80(r1)
+.globl  _savegpr0_23
+_savegpr0_23:
+        std     r23,-72(r1)
+.globl  _savegpr0_24
+_savegpr0_24:
+        std     r24,-64(r1)
+.globl  _savegpr0_25
+_savegpr0_25:
+        std     r25,-56(r1)
+.globl  _savegpr0_26
+_savegpr0_26:
+        std     r26,-48(r1)
+.globl  _savegpr0_27
+_savegpr0_27:
+        std     r27,-40(r1)
+.globl  _savegpr0_28
+_savegpr0_28:
+        std     r28,-32(r1)
+.globl  _savegpr0_29
+_savegpr0_29:
+        std     r29,-24(r1)
+.globl  _savegpr0_30
+_savegpr0_30:
+        std     r30,-16(r1)
+.globl  _savegpr0_31
+_savegpr0_31:
+        std     r31,-8(r1)
+        std     r0,16(r1)
+        blr
+
+.globl  _restgpr0_14
+_restgpr0_14:
+        ld      r14,-144(r1)
+.globl  _restgpr0_15
+_restgpr0_15:
+        ld      r15,-136(r1)
+.globl  _restgpr0_16
+_restgpr0_16:
+        ld      r16,-128(r1)
+.globl  _restgpr0_17
+_restgpr0_17:
+        ld      r17,-120(r1)
+.globl  _restgpr0_18
+_restgpr0_18:
+        ld      r18,-112(r1)
+.globl  _restgpr0_19
+_restgpr0_19:
+        ld      r19,-104(r1)
+.globl  _restgpr0_20
+_restgpr0_20:
+        ld      r20,-96(r1)
+.globl  _restgpr0_21
+_restgpr0_21:
+        ld      r21,-88(r1)
+.globl  _restgpr0_22
+_restgpr0_22:
+        ld      r22,-80(r1)
+.globl  _restgpr0_23
+_restgpr0_23:
+        ld      r23,-72(r1)
+.globl  _restgpr0_24
+_restgpr0_24:
+        ld      r24,-64(r1)
+.globl  _restgpr0_25
+_restgpr0_25:
+        ld      r25,-56(r1)
+.globl  _restgpr0_26
+_restgpr0_26:
+        ld      r26,-48(r1)
+.globl  _restgpr0_27
+_restgpr0_27:
+        ld      r27,-40(r1)
+.globl  _restgpr0_28
+_restgpr0_28:
+        ld      r28,-32(r1)
+.globl  _restgpr0_29
+_restgpr0_29:
+        ld      r0,16(r1)
+        ld      r29,-24(r1)
+        mtlr    r0
+        ld      r30,-16(r1)
+        ld      r31,-8(r1)
+        blr
+
+.globl  _restgpr0_30
+_restgpr0_30:
+        ld      r30,-16(r1)
+.globl  _restgpr0_31
+_restgpr0_31:
+        ld      r0,16(r1)
+        ld      r31,-8(r1)
+        mtlr    r0
+        blr
+
+#endif /* CONFIG_PPC64 */
+
 #endif