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/*- * Copyright (c) 2008 Semihalf, Rafal Czubak * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: release/9.1.0/sys/boot/arm/uboot/start.S 183878 2008-10-14 10:11:14Z raj $ */ #include <machine/asm.h> /* * Entry point to the loader that U-Boot passes control to. */ .text .globl _start _start: /* Hint where to look for the API signature */ ldr ip, =uboot_address str sp, [ip] /* Save U-Boot's r8 */ ldr ip, =saved_regs str r8, [ip, #0] /* Start loader */ b main /* * syscall() */ ENTRY(syscall) /* Save caller's lr */ ldr ip, =saved_regs str lr, [ip, #4] /* Save loader's r8 */ ldr ip, =saved_regs str r8, [ip, #8] /* Restore U-Boot's r8 */ ldr ip, =saved_regs ldr r8, [ip, #0] /* Call into U-Boot */ ldr lr, =return_from_syscall ldr ip, =syscall_ptr ldr pc, [ip] return_from_syscall: /* Restore loader's r8 */ ldr ip, =saved_regs ldr r8, [ip, #8] /* Restore caller's lr */ ldr ip, =saved_regs ldr lr, [ip, #4] /* Return to caller */ mov pc, lr /* * Data section */ .data .align 4 .globl syscall_ptr syscall_ptr: .long 0 .globl uboot_address uboot_address: .long 0 saved_regs: .long 0 /* U-Boot's r8 */ .long 0 /* Loader's r8 */ .long 0 /* Loader's lr */