92 lines
2.5 KiB
ArmAsm
92 lines
2.5 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* relocate - common relocation function for AArch64 U-Boot
|
|
*
|
|
* (C) Copyright 2013
|
|
* Albert ARIBAUD <albert.u.boot@aribaud.net>
|
|
* David Feng <fenghua@phytium.com.cn>
|
|
*/
|
|
|
|
#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
|
|
*/
|
|
adr x1, __image_copy_start /* x1 <- Run &__image_copy_start */
|
|
subs x9, x0, x1 /* x8 <- 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 */
|
|
|
|
adr x1, __image_copy_start /* x1 <- Run &__image_copy_start */
|
|
adr x2, __image_copy_end /* x2 <- Run &__image_copy_end */
|
|
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
|
|
*/
|
|
adr x2, __rel_dyn_start /* x2 <- Run &__rel_dyn_start */
|
|
adr x3, __rel_dyn_end /* x3 <- Run &__rel_dyn_end */
|
|
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
|
|
bl __asm_flush_l3_dcache
|
|
5: ldp x29, x30, [sp],#32
|
|
ret
|
|
ENDPROC(relocate_code)
|