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 adr x1, __image_copy_start /* x1 <- Run &__image_copy_start */ 31 subs x9, x0, x1 /* x8 <- Run to copy offset */ 32 b.eq relocate_done /* skip relocation */ 33 /* 34 * Don't ldr x1, __image_copy_start here, since if the code is already 35 * running at an address other than it was linked to, that instruction 36 * will load the relocated value of __image_copy_start. To 37 * correctly apply relocations, we need to know the linked value. 38 * 39 * Linked &__image_copy_start, which we know was at 40 * CONFIG_SYS_TEXT_BASE, which is stored in _TEXT_BASE, as a non- 41 * relocated value, since it isn't a symbol reference. 42 */ 43 ldr x1, _TEXT_BASE /* x1 <- Linked &__image_copy_start */ 44 subs x9, x0, x1 /* x9 <- Link to copy offset */ 45 46 adr x1, __image_copy_start /* x1 <- Run &__image_copy_start */ 47 adr x2, __image_copy_end /* x2 <- Run &__image_copy_end */ 48copy_loop: 49 ldp x10, x11, [x1], #16 /* copy from source address [x1] */ 50 stp x10, x11, [x0], #16 /* copy to target address [x0] */ 51 cmp x1, x2 /* until source end address [x2] */ 52 b.lo copy_loop 53 str x0, [sp, #24] 54 55 /* 56 * Fix .rela.dyn relocations 57 */ 58 adr x2, __rel_dyn_start /* x2 <- Run &__rel_dyn_start */ 59 adr x3, __rel_dyn_end /* x3 <- Run &__rel_dyn_end */ 60fixloop: 61 ldp x0, x1, [x2], #16 /* (x0,x1) <- (SRC location, fixup) */ 62 ldr x4, [x2], #8 /* x4 <- addend */ 63 and x1, x1, #0xffffffff 64 cmp x1, #R_AARCH64_RELATIVE 65 bne fixnext 66 67 /* relative fix: store addend plus offset at dest location */ 68 add x0, x0, x9 69 add x4, x4, x9 70 str x4, [x0] 71fixnext: 72 cmp x2, x3 73 b.lo fixloop 74 75relocate_done: 76 switch_el x1, 3f, 2f, 1f 77 bl hang 783: mrs x0, sctlr_el3 79 b 0f 802: mrs x0, sctlr_el2 81 b 0f 821: mrs x0, sctlr_el1 830: tbz w0, #2, 5f /* skip flushing cache if disabled */ 84 tbz w0, #12, 4f /* skip invalidating i-cache if disabled */ 85 ic iallu /* i-cache invalidate all */ 86 isb sy 874: ldp x0, x1, [sp, #16] 88 bl __asm_flush_dcache_range 895: ldp x29, x30, [sp],#32 90 ret 91ENDPROC(relocate_code) 92