97 lines
2.9 KiB
ArmAsm
97 lines
2.9 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* relocate - common relocation function for AArch64 U-Boot
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*
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* (C) Copyright 2013
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* Albert ARIBAUD <albert.u.boot@aribaud.net>
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* David Feng <fenghua@phytium.com.cn>
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*/
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#include <asm-offsets.h>
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#include <config.h>
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#include <elf.h>
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#include <linux/linkage.h>
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#include <asm/macro.h>
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/*
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* void relocate_code(addr_moni)
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*
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* This function relocates the monitor code.
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* x0 holds the destination address.
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*/
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ENTRY(relocate_code)
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stp x29, x30, [sp, #-32]! /* create a stack frame */
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mov x29, sp
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str x0, [sp, #16]
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/*
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* Copy u-boot from flash to RAM
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*/
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adrp x1, __image_copy_start /* x1 <- address bits [31:12] */
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add x1, x1, :lo12:__image_copy_start/* x1 <- address bits [11:00] */
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subs x9, x0, x1 /* x9 <- Run to copy offset */
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b.eq relocate_done /* skip relocation */
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/*
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* Don't ldr x1, __image_copy_start here, since if the code is already
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* running at an address other than it was linked to, that instruction
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* will load the relocated value of __image_copy_start. To
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* correctly apply relocations, we need to know the linked value.
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*
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* Linked &__image_copy_start, which we know was at
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* CONFIG_SYS_TEXT_BASE, which is stored in _TEXT_BASE, as a non-
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* relocated value, since it isn't a symbol reference.
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*/
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ldr x1, _TEXT_BASE /* x1 <- Linked &__image_copy_start */
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subs x9, x0, x1 /* x9 <- Link to copy offset */
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adrp x1, __image_copy_start /* x1 <- address bits [31:12] */
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add x1, x1, :lo12:__image_copy_start/* x1 <- address bits [11:00] */
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adrp x2, __image_copy_end /* x2 <- address bits [31:12] */
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add x2, x2, :lo12:__image_copy_end /* x2 <- address bits [11:00] */
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copy_loop:
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ldp x10, x11, [x1], #16 /* copy from source address [x1] */
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stp x10, x11, [x0], #16 /* copy to target address [x0] */
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cmp x1, x2 /* until source end address [x2] */
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b.lo copy_loop
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str x0, [sp, #24]
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/*
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* Fix .rela.dyn relocations
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*/
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adrp x2, __rel_dyn_start /* x2 <- address bits [31:12] */
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add x2, x2, :lo12:__rel_dyn_start /* x2 <- address bits [11:00] */
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adrp x3, __rel_dyn_end /* x3 <- address bits [31:12] */
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add x3, x3, :lo12:__rel_dyn_end /* x3 <- address bits [11:00] */
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fixloop:
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ldp x0, x1, [x2], #16 /* (x0,x1) <- (SRC location, fixup) */
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ldr x4, [x2], #8 /* x4 <- addend */
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and x1, x1, #0xffffffff
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cmp x1, #R_AARCH64_RELATIVE
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bne fixnext
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/* relative fix: store addend plus offset at dest location */
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add x0, x0, x9
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add x4, x4, x9
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str x4, [x0]
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fixnext:
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cmp x2, x3
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b.lo fixloop
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relocate_done:
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switch_el x1, 3f, 2f, 1f
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bl hang
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3: mrs x0, sctlr_el3
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b 0f
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2: mrs x0, sctlr_el2
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b 0f
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1: mrs x0, sctlr_el1
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0: tbz w0, #2, 5f /* skip flushing cache if disabled */
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tbz w0, #12, 4f /* skip invalidating i-cache if disabled */
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ic iallu /* i-cache invalidate all */
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isb sy
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4: ldp x0, x1, [sp, #16]
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bl __asm_flush_dcache_range
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bl __asm_flush_l3_dcache
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5: ldp x29, x30, [sp],#32
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ret
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ENDPROC(relocate_code)
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