freebsd-dev/sys/powerpc/aim/locore32.S

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/* $FreeBSD$ */
/*-
* Copyright (C) 2010-2016 Nathan Whitehorn
* 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 ``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 TOOLS GMBH 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.
*/
#include "assym.s"
#include <sys/syscall.h>
#include <machine/trap.h>
#include <machine/param.h>
#include <machine/spr.h>
#include <machine/asm.h>
#include "opt_platform.h"
/* Locate the per-CPU data structure */
#define GET_CPUINFO(r) \
mfsprg0 r
/*
* Compiled KERNBASE location and the kernel load address
*/
.globl kernbase
.set kernbase, KERNBASE
/*
* Globals
*/
.data
.align 3
GLOBAL(__startkernel)
.long begin
GLOBAL(__endkernel)
.long end
.align 4
#define TMPSTKSZ 8192 /* 8K temporary stack */
GLOBAL(tmpstk)
.space TMPSTKSZ
.text
.globl btext
btext:
/*
* Main kernel entry point.
*/
.text
.globl __start
__start:
/* Figure out where we are */
bl 1f
.long _DYNAMIC-.
.long _GLOBAL_OFFSET_TABLE_-.
.long tmpstk-.
1: mflr %r30
/* Set up temporary stack pointer */
lwz %r1,8(%r30)
add %r1,%r1,%r30
addi %r1,%r1,(8+TMPSTKSZ-32)
/* Relocate self */
stw %r3,16(%r1)
stw %r4,20(%r1)
stw %r5,24(%r1)
stw %r6,28(%r1)
lwz %r3,0(%r30) /* _DYNAMIC in %r3 */
add %r3,%r3,%r30
lwz %r4,4(%r30) /* GOT pointer */
add %r4,%r4,%r30
lwz %r4,4(%r4) /* got[0] is _DYNAMIC link addr */
subf %r4,%r4,%r3 /* subtract to calculate relocbase */
bl elf_reloc_self
lwz %r3,16(%r1)
lwz %r4,20(%r1)
lwz %r5,24(%r1)
lwz %r6,28(%r1)
/* MD setup */
bl powerpc_init
/* Set stack pointer to new value and branch to mi_startup */
mr %r1, %r3
li %r3, 0
stw %r3, 0(%r1)
bl mi_startup
/* mi_startup() does not return */
b .
#include <powerpc/aim/trap_subr32.S>