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/* $OpenBSD: bugcrtS.S,v 1.1 2012/12/31 21:35:32 miod Exp $ */
/*
* Copyright (c) 2012 Miodrag Vallat.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <machine/asm.h>
#include <machine/prom.h>
.text
ASLOCAL(__stack_end)
.long _ASM_LABEL(__stack_end) | sp
.long _C_LABEL(start) | pc
ENTRY(start)
/*
* On entry, d0-d1, d4, a0-a6 contain the BUG incoming parameters.
*/
/*
* Set up stack. This is already done if booted by the BUG, but not
* if invoked from an old bootxx' bugexec().
*/
leal _ASM_LABEL(__stack_end):l, sp
/*
* Push arguments on stack.
*/
movl MVMEPROM_REG_NBARGEND, sp@-
movl MVMEPROM_REG_NBARGSTART, sp@-
movl MVMEPROM_REG_ARGEND, sp@-
movl MVMEPROM_REG_ARGSTART, sp@-
movl MVMEPROM_REG_CONFBLK, sp@-
movl MVMEPROM_REG_ENTRY, sp@-
movl MVMEPROM_REG_CTRLADDR, sp@-
movl MVMEPROM_REG_FLAGS, sp@-
movl MVMEPROM_REG_CTRLLUN, sp@-
movl MVMEPROM_REG_DEVLUN, sp@-
/*
* Invoke the rest of the startup as C code.
*/
bsr _C_LABEL(bugcrt_start)
bsr _C_LABEL(_rtt)
/* NOTREACHED */
ENTRY(bugexec_final)
/*
* Pop arguments to the appropriate registers.
*/
movl sp@(4 * 1), MVMEPROM_REG_DEVLUN
movl sp@(4 * 2), MVMEPROM_REG_CTRLLUN
movl sp@(4 * 3), MVMEPROM_REG_FLAGS
movl sp@(4 * 4), MVMEPROM_REG_CTRLADDR
movl sp@(4 * 5), MVMEPROM_REG_ENTRY
movl sp@(4 * 6), MVMEPROM_REG_CONFBLK
movl sp@(4 * 7), MVMEPROM_REG_ARGSTART
movl sp@(4 * 8), MVMEPROM_REG_ARGEND
movl sp@(4 * 9), MVMEPROM_REG_NBARGSTART
movl sp@(4 * 10), MVMEPROM_REG_NBARGEND
/*
* Pop return address
*/
movl sp@(4 * 11), d2
/*
* Pop stack address
*/
movl sp@(4 * 12), sp
/*
* Push return address
*/
movl _ASM_LABEL(bugexec_returned), sp@-
movl d2, sp@-
rts
ASLOCAL(bugexec_returned)
bsr _C_LABEL(_rtt)
/* NOTREACHED */
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