Compilation is changed for little endian and entry points between the
wrapper and the kernel are modified to fix endian order with the famous
FIXUP_ENDIAN trampoline. This is PowerPC magic.
Signed-off-by: Cédric Le Goater <c...@fr.ibm.com>
---
arch/powerpc/boot/Makefile | 7 +++++--
arch/powerpc/boot/crt0.S | 1 +
arch/powerpc/boot/ppc_asm.h | 12 ++++++++++++
arch/powerpc/boot/pseries-head.S | 3 +++
arch/powerpc/boot/wrapper | 1 +
5 files changed, 22 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index bedbd46273e4..de71d2a0af3b 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -22,11 +22,14 @@ all: $(obj)/zImage
BOOTCFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
-fno-strict-aliasing -Os -msoft-float -pipe \
-fomit-frame-pointer -fno-builtin -fPIC -nostdinc \
- -isystem $(shell $(CROSS32CC) -print-file-name=include) \
- -mbig-endian
+ -isystem $(shell $(CROSS32CC) -print-file-name=include)
ifdef CONFIG_PPC64
BOOTCFLAGS += -m64
endif
+ifdef CONFIG_CPU_BIG_ENDIAN
+BOOTCFLAGS += -mbig-endian
+endif
+
BOOTAFLAGS := -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional -nostdinc
ifdef CONFIG_DEBUG_INFO
diff --git a/arch/powerpc/boot/crt0.S b/arch/powerpc/boot/crt0.S
index 689290561e69..14de4f8778a7 100644
--- a/arch/powerpc/boot/crt0.S
+++ b/arch/powerpc/boot/crt0.S
@@ -275,6 +275,7 @@ prom:
rfid
1: /* Return from OF */
+ FIXUP_ENDIAN
/* Restore registers and return. */
rldicl r1,r1,0,32
diff --git a/arch/powerpc/boot/ppc_asm.h b/arch/powerpc/boot/ppc_asm.h
index eb0e98be69e0..35ea60c1f070 100644
--- a/arch/powerpc/boot/ppc_asm.h
+++ b/arch/powerpc/boot/ppc_asm.h
@@ -62,4 +62,16 @@
#define SPRN_TBRL 268
#define SPRN_TBRU 269
+#define FIXUP_ENDIAN \
+ tdi 0, 0, 0x48; /* Reverse endian of b . + 8 */ \
+ b $+36; /* Skip trampoline if endian is good */ \
+ .long 0x05009f42; /* bcl 20,31,$+4 */ \
+ .long 0xa602487d; /* mflr r10 */ \
+ .long 0x1c004a39; /* addi r10,r10,28 */ \
+ .long 0xa600607d; /* mfmsr r11 */ \
+ .long 0x01006b69; /* xori r11,r11,1 */ \
+ .long 0xa6035a7d; /* mtsrr0 r10 */ \
+ .long 0xa6037b7d; /* mtsrr1 r11 */ \
+ .long 0x2400004c /* rfid */
+
#endif /* _PPC64_PPC_ASM_H */
diff --git a/arch/powerpc/boot/pseries-head.S b/arch/powerpc/boot/pseries-head.S
index 655c3d2c321b..6ef6e02e80f9 100644
--- a/arch/powerpc/boot/pseries-head.S
+++ b/arch/powerpc/boot/pseries-head.S
@@ -1,5 +1,8 @@
+#include "ppc_asm.h"
+
.text
.globl _zimage_start
_zimage_start:
+ FIXUP_ENDIAN
b _zimage_start_lib
diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper
index 6eca1b4ecfa4..a1654b510ff3 100755
--- a/arch/powerpc/boot/wrapper
+++ b/arch/powerpc/boot/wrapper
@@ -139,6 +139,7 @@ fi
elfformat="`${CROSS}objdump -p "$kernel" | grep 'file format' | awk '{print
$4}'`"
case "$elfformat" in
+ elf64-powerpcle) format=elf64lppc ;;
elf64-powerpc) format=elf64ppc ;;
elf32-powerpc) format=elf32ppc ;;
esac
--
1.7.10.4
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