+/* 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>
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <asm-offsets.h>
#include <config.h>
+#include <elf.h>
#include <linux/linkage.h>
+#include <asm/macro.h>
/*
* void relocate_code (addr_moni)
* 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
*/
- ldr x1, =__image_copy_start /* x1 <- SRC &__image_copy_start */
- subs x9, x0, x1 /* x9 <- relocation offset */
+ 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 */
- ldr x2, =__image_copy_end /* x2 <- SRC &__image_copy_end */
+ /*
+ * 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
*/
- ldr x2, =__rel_dyn_start /* x2 <- SRC &__rel_dyn_start */
- ldr x3, =__rel_dyn_end /* x3 <- SRC &__rel_dyn_end */
+ 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, #1027 /* relative fixup? */
+ cmp x1, #R_AARCH64_RELATIVE
bne fixnext
/* relative fix: store addend plus offset at dest location */
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
+5: ldp x29, x30, [sp],#32
ret
ENDPROC(relocate_code)