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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/powerpc/aim/locore32.S
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/*-

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 * Copyright (C) 2010-2016 Nathan Whitehorn

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 * All rights reserved.

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 *

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 * 1. Redistributions of source code must retain the above copyright

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 *    notice, this list of conditions and the following disclaimer.

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 * 2. Redistributions in binary form must reproduce the above copyright

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 *    notice, this list of conditions and the following disclaimer in the

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 *    documentation and/or other materials provided with the distribution.

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 *

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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

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 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

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 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

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 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

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 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

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 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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 */

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#include "assym.inc"

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#include <sys/syscall.h>

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#include <machine/trap.h>

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#include <machine/param.h>

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#include <machine/spr.h>

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#include <machine/asm.h>

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#include <machine/vmparam.h>

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#include "opt_platform.h"

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/* Locate the per-CPU data structure */

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#define GET_CPUINFO(r)  \

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        mfsprg0  r

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/*

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 * Compiled KERNBASE location and the kernel load address

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 */

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        .globl  kernbase

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        .set    kernbase, KERNBASE

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/*

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 * Globals

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 */

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	.data

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	.align 3

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GLOBAL(__startkernel)

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	.long	begin

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GLOBAL(__endkernel)

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	.long	end

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	.align	4

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#define	TMPSTKSZ	8192		/* 8K temporary stack */

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GLOBAL(tmpstk)

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	.space	TMPSTKSZ

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#ifdef KDB

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#define TRAPSTKSZ       4096            /* 4k trap stack */

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GLOBAL(trapstk)

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        .space        TRAPSTKSZ

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#endif

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	.text

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	.globl	btext

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btext:

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/*

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 * Main kernel entry point.

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 */

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	.text

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	.globl	__start

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__start:

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	/* Figure out where we are */

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	bl	1f

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	.long	_DYNAMIC-.

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	.long	_GLOBAL_OFFSET_TABLE_-.

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	.long	tmpstk-.

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1:	mflr	%r30

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	/* Set up temporary stack pointer */

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	lwz	%r1,8(%r30)

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	add	%r1,%r1,%r30

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	addi	%r1,%r1,(8+TMPSTKSZ-40)

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	/* Relocate self */

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	stw	%r3,16(%r1)

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	stw	%r4,20(%r1)

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	stw	%r5,24(%r1)

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	stw	%r6,28(%r1)

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	stw	%r7,32(%r1)

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	lwz	%r3,0(%r30) /* _DYNAMIC in %r3 */

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	add	%r3,%r3,%r30

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	lwz	%r4,4(%r30) /* GOT pointer */

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	add	%r4,%r4,%r30

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	lwz	%r4,4(%r4)  /* got[0] is _DYNAMIC link addr */

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	subf	%r4,%r4,%r3 /* subtract to calculate relocbase */

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	bl	elf_reloc_self

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	lwz	%r3,16(%r1)

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	lwz	%r4,20(%r1)

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	lwz	%r5,24(%r1)

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	lwz	%r6,28(%r1)

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	lwz	%r7,32(%r1)

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	/* MD setup */

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	bl	powerpc_init

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	/* Set stack pointer to new value and branch to mi_startup */

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	mr	%r1, %r3

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	li	%r3, 0

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	stw	%r3, 0(%r1)

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	bl	mi_startup

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	/* mi_startup() does not return */

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	b	.

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#include <powerpc/aim/trap_subr32.S>

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