diff options
Diffstat (limited to 'roms/u-boot/arch/arm/lib/relocate_64.S')
| -rw-r--r-- | roms/u-boot/arch/arm/lib/relocate_64.S | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/roms/u-boot/arch/arm/lib/relocate_64.S b/roms/u-boot/arch/arm/lib/relocate_64.S new file mode 100644 index 000000000..72e91f270 --- /dev/null +++ b/roms/u-boot/arch/arm/lib/relocate_64.S @@ -0,0 +1,96 @@ +/* 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> + */ + +#include <asm-offsets.h> +#include <config.h> +#include <elf.h> +#include <linux/linkage.h> +#include <asm/macro.h> + +/* + * void relocate_code(addr_moni) + * + * This function relocates the monitor code. + * 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 + */ + adrp x1, __image_copy_start /* x1 <- address bits [31:12] */ + add x1, x1, :lo12:__image_copy_start/* x1 <- address bits [11:00] */ + subs x9, x0, x1 /* x9 <- Run to copy offset */ + b.eq relocate_done /* skip relocation */ + /* + * 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 */ + + adrp x1, __image_copy_start /* x1 <- address bits [31:12] */ + add x1, x1, :lo12:__image_copy_start/* x1 <- address bits [11:00] */ + adrp x2, __image_copy_end /* x2 <- address bits [31:12] */ + add x2, x2, :lo12:__image_copy_end /* x2 <- address bits [11:00] */ +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 + */ + adrp x2, __rel_dyn_start /* x2 <- address bits [31:12] */ + add x2, x2, :lo12:__rel_dyn_start /* x2 <- address bits [11:00] */ + adrp x3, __rel_dyn_end /* x3 <- address bits [31:12] */ + add x3, x3, :lo12:__rel_dyn_end /* x3 <- address bits [11:00] */ +fixloop: + ldp x0, x1, [x2], #16 /* (x0,x1) <- (SRC location, fixup) */ + ldr x4, [x2], #8 /* x4 <- addend */ + and x1, x1, #0xffffffff + cmp x1, #R_AARCH64_RELATIVE + bne fixnext + + /* relative fix: store addend plus offset at dest location */ + add x0, x0, x9 + add x4, x4, x9 + str x4, [x0] +fixnext: + cmp x2, x3 + 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 + bl __asm_flush_l3_dcache +5: ldp x29, x30, [sp],#32 + ret +ENDPROC(relocate_code) |