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https://github.com/AsahiLinux/u-boot
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544071ac4a
ENTRY/ENDPROC macros from linux/linkage.h will make code more readable and also will properly mark assembly symbol in ELF binary as function symbol. Signed-off-by: Pali Rohár <pali@kernel.org>
97 lines
2.5 KiB
ArmAsm
97 lines
2.5 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2011-2012
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* Pali Rohár <pali@kernel.org>
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*/
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#include <config.h>
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#include <linux/linkage.h>
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kernoffs: /* offset of kernel image from this address */
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.word . - CONFIG_TEXT_BASE - KERNEL_OFFSET
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kernaddr: /* address of kernel after copying */
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.word KERNEL_ADDRESS
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kernsize: /* maximal size of kernel image */
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.word KERNEL_MAXSIZE
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imagesize: /* maximal size of image */
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.word IMAGE_MAXSIZE
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ih_magic: /* IH_MAGIC in big endian from include/image.h */
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.word 0x56190527
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z_magic: /* LINUX_ARM_ZIMAGE_MAGIC */
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.word 0x016f2818
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/*
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* Routine: save_boot_params (called after reset from start.S)
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* Description: Copy attached kernel to address KERNEL_ADDRESS
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*/
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ENTRY(save_boot_params)
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/*
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* Copy valid attached kernel to absolute address KERNEL_ADDRESS
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*
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* Nokia X-Loader is loading secondary image to address 0x80400000.
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* NOLO is loading boot image to random place, so it doesn't really
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* matter what is set in CONFIG_TEXT_BASE. We have to detect
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* KERNEL_OFFSET from the current execution address and copy it to
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* absolute address KERNEL_ADDRESS.
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*
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* Note that U-Boot has to be compiled with CONFIG_POSITION_INDEPENDENT
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* because it is loaded at random address and not to the fixed address
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* (CONFIG_TEXT_BASE).
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*/
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/* r0 - start of kernel before */
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adr r0, kernoffs /* r0 - current address of kernoffs section */
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ldr r1, kernoffs /* r1 - offset of kernel image from kernoffs section */
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sub r0, r0, r1
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/* r3 - start of kernel after */
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ldr r3, kernaddr
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/* r2 - end of kernel after */
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ldr r1, kernsize
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add r2, r3, r1
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/* r1 - end of kernel before */
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add r1, r0, r1
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/* remove header in target kernel */
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mov r5, #0
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str r5, [r3] /* remove 4 bytes header of kernel uImage */
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str r5, [r3, #36] /* remove 4 bytes header of kernel zImage */
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/* check for valid kernel uImage */
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ldr r4, [r0] /* r4 - 4 bytes header of kernel */
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ldr r5, ih_magic /* r5 - IH_MAGIC */
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cmp r4, r5
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beq copy_kernel_loop
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/* check for valid kernel zImage */
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ldr r4, [r0, #36] /* r4 - 4 bytes header of kernel at offset 36 */
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ldr r5, z_magic /* r5 - LINUX_ARM_ZIMAGE_MAGIC */
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cmp r4, r5
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bne skip_copy /* skip if invalid image */
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copy_kernel_loop:
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ldmdb r1!, {r3 - r10}
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stmdb r2!, {r3 - r10}
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cmp r1, r0
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bhi copy_kernel_loop
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/* remove header in source kernel image */
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mov r5, #0
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str r5, [r0] /* remove 4 bytes header of kernel uImage */
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str r5, [r0, #36] /* remove 4 bytes header of kernel zImage */
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skip_copy:
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/* Returns */
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b save_boot_params_ret
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ENDPROC(save_boot_params)
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