link_off calculates the difference between link address and actual load address. This is a must for true PIC u-boot.
Signed-off-by: Joakim Tjernlund Joakim.Tjernlund@transmode.se --- arch/powerpc/cpu/mpc83xx/start.S | 26 ++++++++++++++++++++++++++ include/common.h | 7 +++++++ 2 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/cpu/mpc83xx/start.S b/arch/powerpc/cpu/mpc83xx/start.S index 1ab8c88..16aed0a 100644 --- a/arch/powerpc/cpu/mpc83xx/start.S +++ b/arch/powerpc/cpu/mpc83xx/start.S @@ -419,6 +419,32 @@ ProgramCheck: _end_of_vectors:
. = 0x3000 +#ifdef CONFIG_SYS_TRUE_PIC + .globl link_off /* const void * link_off(const void * ptr) */ + .type link_off, @function + /* + * Calculates the offset between link address and load address + * and subtracs the offset to from its argument(r3) + * This function must be where _GOT2_TABLE_ is defined + */ +link_off: + /* GOT hand coded as we cannot clobber r12 */ + mflr r4 + bl 1f + .text 2 +0: .long .LCTOC1-1f + .text +1: mflr r6 + lwz r0,0b-1b(r6) + add r6,r0,r6 + mtlr r4 + la r4,.L__GOT2_TABLE_(r6) /* addi r4,r6,.L__GOT2_TABLE_ */ + lwz r5,.L__GOT2_TABLE_(r6) + sub r4,r5,r4 /* r4 - r5 */ + sub r3,r3,r4 /* r4 - r3 */ + blr + .size link_off, .-link_off +#endif
/* * This code finishes saving the registers to the exception frame diff --git a/include/common.h b/include/common.h index 189ad81..a04bd27 100644 --- a/include/common.h +++ b/include/common.h @@ -112,6 +112,13 @@ typedef volatile unsigned char vu_char; #include <asm/arch/hardware.h> #endif
+#ifdef CONFIG_SYS_TRUE_PIC +const void * link_off(const void *); +#else +#define link_off(x) ((const void *)(x)) +#endif +#define LINK_OFF(x) ((__typeof__(x))link_off(x)) + #include <part.h> #include <flash.h> #include <image.h>