powerpc: Fix module building for gcc 4.5 and 64 bit
Stephen Rothwell [Tue, 29 Jun 2010 20:08:42 +0000 (20:08 +0000)]
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>

arch/powerpc/Makefile
arch/powerpc/lib/Makefile
arch/powerpc/lib/crtsavres.S
scripts/mod/modpost.c

index 42dcd3f..77cfe7a 100644 (file)
@@ -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
index 3040dac..111da1c 100644 (file)
@@ -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 \
index 70a9cd8..1c893f0 100644 (file)
@@ -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
index f877900..f6127b9 100644 (file)
@@ -503,6 +503,11 @@ static int ignore_undef_symbol(struct elf_info *info, const char *symname)
                    strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
                    strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0)
                        return 1;
+       if (info->hdr->e_machine == EM_PPC64)
+               /* Special register function linked on all modules during final link of .ko */
+               if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
+                   strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0)
+                       return 1;
        /* Do not ignore this symbol */
        return 0;
 }