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 <elf.h> 14#include <linux/linkage.h> 15#include <asm/macro.h> 16 17/* 18 * void relocate_code (addr_moni) 19 * 20 * This function relocates the monitor code. 21 * x0 holds the destination address. 22 */ 23ENTRY(relocate_code) 24 stp x29, x30, [sp, #-32]! /* create a stack frame */ 25 mov x29, sp 26 str x0, [sp, #16] 27 /* 28 * Copy u-boot from flash to RAM 29 */ 30 ldr x1, =__image_copy_start /* x1 <- SRC &__image_copy_start */ 31 subs x9, x0, x1 /* x9 <- relocation offset */ 32 b.eq relocate_done /* skip relocation */ 33 ldr x2, =__image_copy_end /* x2 <- SRC &__image_copy_end */ 34 35copy_loop: 36 ldp x10, x11, [x1], #16 /* copy from source address [x1] */ 37 stp x10, x11, [x0], #16 /* copy to target address [x0] */ 38 cmp x1, x2 /* until source end address [x2] */ 39 b.lo copy_loop 40 str x0, [sp, #24] 41 42 /* 43 * Fix .rela.dyn relocations 44 */ 45 ldr x2, =__rel_dyn_start /* x2 <- SRC &__rel_dyn_start */ 46 ldr x3, =__rel_dyn_end /* x3 <- SRC &__rel_dyn_end */ 47fixloop: 48 ldp x0, x1, [x2], #16 /* (x0,x1) <- (SRC location, fixup) */ 49 ldr x4, [x2], #8 /* x4 <- addend */ 50 and x1, x1, #0xffffffff 51 cmp x1, #R_AARCH64_RELATIVE 52 bne fixnext 53 54 /* relative fix: store addend plus offset at dest location */ 55 add x0, x0, x9 56 add x4, x4, x9 57 str x4, [x0] 58fixnext: 59 cmp x2, x3 60 b.lo fixloop 61 62relocate_done: 63 switch_el x1, 3f, 2f, 1f 64 bl hang 653: mrs x0, sctlr_el3 66 b 0f 672: mrs x0, sctlr_el2 68 b 0f 691: mrs x0, sctlr_el1 700: tbz w0, #2, 5f /* skip flushing cache if disabled */ 71 tbz w0, #12, 4f /* skip invalidating i-cache if disabled */ 72 ic iallu /* i-cache invalidate all */ 73 isb sy 744: ldp x0, x1, [sp, #16] 75 bl __asm_flush_dcache_range 765: ldp x29, x30, [sp],#32 77 ret 78ENDPROC(relocate_code) 79