1/* SPDX-License-Identifier: GPL-2.0+ */ 2/* 3 * relocate - common relocation function for AArch64 U-Boot 4 * 5 * (C) Copyright 2013 6 * Albert ARIBAUD <albert.u.boot@aribaud.net> 7 * David Feng <fenghua@phytium.com.cn> 8 */ 9 10#include <asm-offsets.h> 11#include <config.h> 12#include <elf.h> 13#include <linux/linkage.h> 14#include <asm/macro.h> 15 16/* 17 * void relocate_code (addr_moni) 18 * 19 * This function relocates the monitor code. 20 * x0 holds the destination address. 21 */ 22ENTRY(relocate_code) 23 stp x29, x30, [sp, #-32]! /* create a stack frame */ 24 mov x29, sp 25 str x0, [sp, #16] 26 /* 27 * Copy u-boot from flash to RAM 28 */ 29 adr x1, __image_copy_start /* x1 <- Run &__image_copy_start */ 30 subs x9, x0, x1 /* x8 <- Run to copy offset */ 31 b.eq relocate_done /* skip relocation */ 32 /* 33 * Don't ldr x1, __image_copy_start here, since if the code is already 34 * running at an address other than it was linked to, that instruction 35 * will load the relocated value of __image_copy_start. To 36 * correctly apply relocations, we need to know the linked value. 37 * 38 * Linked &__image_copy_start, which we know was at 39 * CONFIG_SYS_TEXT_BASE, which is stored in _TEXT_BASE, as a non- 40 * relocated value, since it isn't a symbol reference. 41 */ 42 ldr x1, _TEXT_BASE /* x1 <- Linked &__image_copy_start */ 43 subs x9, x0, x1 /* x9 <- Link to copy offset */ 44 45 adr x1, __image_copy_start /* x1 <- Run &__image_copy_start */ 46 adr x2, __image_copy_end /* x2 <- Run &__image_copy_end */ 47copy_loop: 48 ldp x10, x11, [x1], #16 /* copy from source address [x1] */ 49 stp x10, x11, [x0], #16 /* copy to target address [x0] */ 50 cmp x1, x2 /* until source end address [x2] */ 51 b.lo copy_loop 52 str x0, [sp, #24] 53 54 /* 55 * Fix .rela.dyn relocations 56 */ 57 adr x2, __rel_dyn_start /* x2 <- Run &__rel_dyn_start */ 58 adr x3, __rel_dyn_end /* x3 <- Run &__rel_dyn_end */ 59fixloop: 60 ldp x0, x1, [x2], #16 /* (x0,x1) <- (SRC location, fixup) */ 61 ldr x4, [x2], #8 /* x4 <- addend */ 62 and x1, x1, #0xffffffff 63 cmp x1, #R_AARCH64_RELATIVE 64 bne fixnext 65 66 /* relative fix: store addend plus offset at dest location */ 67 add x0, x0, x9 68 add x4, x4, x9 69 str x4, [x0] 70fixnext: 71 cmp x2, x3 72 b.lo fixloop 73 74relocate_done: 75 switch_el x1, 3f, 2f, 1f 76 bl hang 773: mrs x0, sctlr_el3 78 b 0f 792: mrs x0, sctlr_el2 80 b 0f 811: mrs x0, sctlr_el1 820: tbz w0, #2, 5f /* skip flushing cache if disabled */ 83 tbz w0, #12, 4f /* skip invalidating i-cache if disabled */ 84 ic iallu /* i-cache invalidate all */ 85 isb sy 864: ldp x0, x1, [sp, #16] 87 bl __asm_flush_dcache_range 885: ldp x29, x30, [sp],#32 89 ret 90ENDPROC(relocate_code) 91