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| /*
| * relocate - common relocation function for AArch64 U-Boot
| *
| * (C) Copyright 2013
| * Albert ARIBAUD <albert.u.boot@aribaud.net>
| * David Feng <fenghua@phytium.com.cn>
| *
| * SPDX-License-Identifier: GPL-2.0+
| */
|
| #include <asm-offsets.h>
| #include <config.h>
| #include <elf.h>
| #include <linux/linkage.h>
| #include <asm/macro.h>
|
| /*
| * void relocate_code (addr_moni)
| *
| * This function relocates the monitor code.
| * x0 holds the destination address.
| */
| ENTRY(relocate_code)
| stp x29, x30, [sp, #-32]! /* create a stack frame */
| mov x29, sp
| str x0, [sp, #16]
| /*
| * Copy u-boot from flash to RAM
| */
| adrp x1, __image_copy_start /* x1 <- address bits [31:12] */
| add x1, x1, :lo12:__image_copy_start/* x1 <- address bits [11:00] */
| subs x9, x0, x1 /* x9 <- Run to copy offset */
| b.eq relocate_done /* skip relocation */
| /*
| * Don't ldr x1, __image_copy_start here, since if the code is already
| * running at an address other than it was linked to, that instruction
| * will load the relocated value of __image_copy_start. To
| * correctly apply relocations, we need to know the linked value.
| *
| * Linked &__image_copy_start, which we know was at
| * CONFIG_SYS_TEXT_BASE, which is stored in _TEXT_BASE, as a non-
| * relocated value, since it isn't a symbol reference.
| */
| ldr x1, _TEXT_BASE /* x1 <- Linked &__image_copy_start */
| subs x9, x0, x1 /* x9 <- Link to copy offset */
|
| adrp x1, __image_copy_start /* x1 <- address bits [31:12] */
| add x1, x1, :lo12:__image_copy_start/* x1 <- address bits [11:00] */
| adrp x2, __image_copy_end /* x2 <- address bits [31:12] */
| add x2, x2, :lo12:__image_copy_end /* x2 <- address bits [11:00] */
| copy_loop:
| ldp x10, x11, [x1], #16 /* copy from source address [x1] */
| stp x10, x11, [x0], #16 /* copy to target address [x0] */
| cmp x1, x2 /* until source end address [x2] */
| b.lo copy_loop
| str x0, [sp, #24]
|
| /*
| * Fix .rela.dyn relocations
| */
| adrp x2, __rel_dyn_start /* x2 <- address bits [31:12] */
| add x2, x2, :lo12:__rel_dyn_start /* x2 <- address bits [11:00] */
| adrp x3, __rel_dyn_end /* x3 <- address bits [31:12] */
| add x3, x3, :lo12:__rel_dyn_end /* x3 <- address bits [11:00] */
| fixloop:
| ldp x0, x1, [x2], #16 /* (x0,x1) <- (SRC location, fixup) */
| ldr x4, [x2], #8 /* x4 <- addend */
| and x1, x1, #0xffffffff
| cmp x1, #R_AARCH64_RELATIVE
| bne fixnext
|
| /* relative fix: store addend plus offset at dest location */
| add x0, x0, x9
| add x4, x4, x9
| str x4, [x0]
| fixnext:
| cmp x2, x3
| b.lo fixloop
|
| relocate_done:
| switch_el x1, 3f, 2f, 1f
| bl hang
| 3: mrs x0, sctlr_el3
| b 0f
| 2: mrs x0, sctlr_el2
| b 0f
| 1: mrs x0, sctlr_el1
| 0: tbz w0, #2, 5f /* skip flushing cache if disabled */
| tbz w0, #12, 4f /* skip invalidating i-cache if disabled */
| ic iallu /* i-cache invalidate all */
| isb sy
| 4: ldp x0, x1, [sp, #16]
| bl __asm_flush_dcache_range
| 5: ldp x29, x30, [sp],#32
| ret
| ENDPROC(relocate_code)
|
|
