arch/arm/lib/relocate_64.S

   1 /*
   2  * relocate - common relocation function for AArch64 U-Boot
   3  *
   4  * (C) Copyright 2013
   5  * Albert ARIBAUD <albert.u.boot@aribaud.net>
   6  * David Feng <fenghua@phytium.com.cn>
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <asm-offsets.h>
  12 #include <config.h>
  13 #include <linux/linkage.h>
  14
  15 /*
  16  * void relocate_code (addr_moni)
  17  *
  18  * This function relocates the monitor code.
  19  * x0 holds the destination address.
  20  */
  21 ENTRY(relocate_code)
  22         /*
  23          * Copy u-boot from flash to RAM
  24          */
  25         ldr     x1, =__image_copy_start /* x1 <- SRC &__image_copy_start */
  26         subs    x9, x0, x1              /* x9 <- relocation offset */
  27         b.eq    relocate_done           /* skip relocation */
  28         ldr     x2, =__image_copy_end   /* x2 <- SRC &__image_copy_end */
  29
  30 copy_loop:
  31         ldp     x10, x11, [x1], #16     /* copy from source address [x1] */
  32         stp     x10, x11, [x0], #16     /* copy to   target address [x0] */
  33         cmp     x1, x2                  /* until source end address [x2] */
  34         b.lo    copy_loop
  35
  36         /*
  37          * Fix .rela.dyn relocations
  38          */
  39         ldr     x2, =__rel_dyn_start    /* x2 <- SRC &__rel_dyn_start */
  40         ldr     x3, =__rel_dyn_end      /* x3 <- SRC &__rel_dyn_end */
  41 fixloop:
  42         ldp     x0, x1, [x2], #16       /* (x0,x1) <- (SRC location, fixup) */
  43         ldr     x4, [x2], #8            /* x4 <- addend */
  44         and     x1, x1, #0xffffffff
  45         cmp     x1, #1027               /* relative fixup? */
  46         bne     fixnext
  47
  48         /* relative fix: store addend plus offset at dest location */
  49         add     x0, x0, x9
  50         add     x4, x4, x9
  51         str     x4, [x0]
  52 fixnext:
  53         cmp     x2, x3
  54         b.lo    fixloop
  55
  56 relocate_done:
  57         ret
  58 ENDPROC(relocate_code)