[PATCH v2] powerpc: mpc85xx: Simplify jump to _start_cont in flash code

["Pali Rohár" <pali@kernel.org>]

After more patches code for jumping to _start_cont symbol in flash memory
involved to code with useless mathematical operations. Currently it does:

  r3 := CONFIG_SYS_MONITOR_BASE + ABS(_start_cont) - CONFIG_SYS_MONITOR_BASE
  jump to r3

Which is equivalent of just:

  r3 := ABS(_start_cont)
  jump to r3

The purpose of that code is just to jump to _start_code symbol,
independently of program counter. So branch must be done to absolute
address. Trying to write:

  ba _start_cont

just cause linker error:

    LD      u-boot
  powerpc-linux-gnuspe-ld.bfd: arch/powerpc/cpu/mpc85xx/start.o: in function `switch_as':
  (.bootpg+0x4b8): relocation truncated to fit: R_PPC_ADDR24 against symbol `_start_cont' defined in .text section in arch/powerpc/cpu/mpc85xx/start.o
  make: *** [Makefile:1801: u-boot] Error 1

Probably by the fact that absolute address cannot be expressed by 24-bits.
So write the code via mtlr+blr pattern as it was before and load general
purpose register with absolute address of the symbol:

  lis     r3,_start_cont@h
  ori     r3,r3,_start_cont@l
  mtlr    r3
  blr

Seems that gcc and gnu ld linker support symbol@h and symbol@l syntax like
number@h and number@l without any problem. And disassembling of compiler
u-boot binary proved that lis+ori instructions are called with numbers
which represent halves of absolute address of _start_cont symbol.

Signed-off-by: Pali Rohár <pali@kernel.org>
---
Changes in v2:
* Rebased on top of next branch, commit d61c11b8c894fad517677dc51ee82d1eade39c01
---
 arch/powerpc/cpu/mpc85xx/start.S | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/cpu/mpc85xx/start.S b/arch/powerpc/cpu/mpc85xx/start.S
index 5009cbef54a0..8a6340d800c3 100644
--- a/arch/powerpc/cpu/mpc85xx/start.S
+++ b/arch/powerpc/cpu/mpc85xx/start.S
@@ -1126,9 +1126,8 @@ switch_as:
 #else
 	/* Calculate absolute address in FLASH and jump there		*/
 	/*--------------------------------------------------------------*/
-	lis	r3,CONFIG_VAL(SYS_MONITOR_BASE)@h
-	ori	r3,r3,CONFIG_VAL(SYS_MONITOR_BASE)@l
-	addi	r3,r3,_start_cont - CONFIG_VAL(SYS_MONITOR_BASE)
+	lis	r3,_start_cont@h
+	ori	r3,r3,_start_cont@l
 	mtlr	r3
 	blr
 #endif
-- 
2.20.1