47f69f4f2b
PowerPC kernels in r6 is actually metadata from loader(8) or gibberish left in r6, which is not required to be anything under the PAPR/ePAPR/CHRP/OF standards, by another boot loader. Note that, as a result, systems need a new boot loader to boot PPC kernels after this revision without ending up at a mountroot prompt. New boot loaders are backwards compatible and can boot older kernels. Reviewed by: jhibbits MFC after: 2 months
118 lines
2.8 KiB
ArmAsm
118 lines
2.8 KiB
ArmAsm
/* $FreeBSD$ */
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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.s"
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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 "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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.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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