The current code uses four instructions and a temporary register to calculate the relocation offset and to adjust the gp register.
The relocation offset can be calculated directly from the CONFIG_SYS_MONITOR_BASE constant and from the destination address. The resulting offset can be used to adjust the gp pointer. This approach makes the code a bit simpler because it needs two instructions only. Signed-off-by: Gabor Juhos <[email protected]> Cc: Daniel Schwierzeck <[email protected]> Cc: Xiangfu Liu <[email protected]> --- arch/mips/cpu/xburst/start.S | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/arch/mips/cpu/xburst/start.S b/arch/mips/cpu/xburst/start.S index 194d745..35728eb 100644 --- a/arch/mips/cpu/xburst/start.S +++ b/arch/mips/cpu/xburst/start.S @@ -64,19 +64,13 @@ relocate_code: move sp, a0 # set new stack pointer li t0, CONFIG_SYS_MONITOR_BASE + sub t6, a2, t0 # t6 <-- relocation offset + la t3, in_ram lw t2, -12(t3) # t2 <-- uboot_end_data move t1, a2 - /* - * Fix $gp: - * - * New $gp = (Old $gp - CONFIG_SYS_MONITOR_BASE) + Destination Address - */ - move t6, gp - sub gp, CONFIG_SYS_MONITOR_BASE - add gp, a2 # gp now adjusted - sub t6, gp, t6 # t6 <-- relocation offset + add gp, t6 # adjust gp /* * t0 = source address -- 1.7.10 _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
