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##=============================================================================
##
## context.S
##
## H8/300 context switch code
##
##=============================================================================
#####ECOSGPLCOPYRIGHTBEGIN####
## -------------------------------------------
## This file is part of eCos, the Embedded Configurable Operating System.
## Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
##
## eCos is free software; you can redistribute it and/or modify it under
## the terms of the GNU General Public License as published by the Free
## Software Foundation; either version 2 or (at your option) any later version.
##
## eCos is distributed in the hope that it will be useful, but WITHOUT ANY
## WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
## for more details.
##
## You should have received a copy of the GNU General Public License along
## with eCos; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
##
## As a special exception, if other files instantiate templates or use macros
## or inline functions from this file, or you compile this file and link it
## with other works to produce a work based on this file, this file does not
## by itself cause the resulting work to be covered by the GNU General Public
## License. However the source code for this file must still be made available
## in accordance with section (3) of the GNU General Public License.
##
## This exception does not invalidate any other reasons why a work based on
## this file might be covered by the GNU General Public License.
##
## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
## at http://sources.redhat.com/ecos/ecos-license/
## -------------------------------------------
#####ECOSGPLCOPYRIGHTEND####
##=============================================================================
#######DESCRIPTIONBEGIN####
##
## Author(s): yoshinori sato
## Contributors: yoshinori sato
## Date: 2002-02-17
## Purpose: H8/300 context switch code
## Description: This file contains implementations of the thread context
## switch routines. It also contains the longjmp() and setjmp()
## routines.
##
######DESCRIPTIONEND####
##
##=============================================================================
#include <pkgconf/hal.h>
#include <cyg/hal/arch.inc>
#include <cyg/hal/basetype.h>
.h8300h
#------------------------------------------------------------------------------
# hal_thread_switch_context
# Switch thread contexts
# D0 = address of sp of next thread to execute
# D1 = address of sp save location of current thread
.global CYG_LABEL_DEFN(hal_thread_switch_context)
CYG_LABEL_DEFN(hal_thread_switch_context):
hal_cpu_save_all
mov.l sp,@er1
# Now load the destination thread by dropping through
# to hal_thread_load_context
#------------------------------------------------------------------------------
# hal_thread_load_context
# Load thread context
# D0 = address of sp of next thread to execute
# Note that this function is also the second half of hal_thread_switch_context
# and is simply dropped into from it.
.global CYG_LABEL_DEFN(hal_thread_load_context)
CYG_LABEL_DEFN(hal_thread_load_context):
mov.l @er0,sp
hal_cpu_load_all
rts
##-----------------------------------------------------------------------------
## HAL longjmp(), setjmp() implementations
## These implementations omit the usual movm [d2,d3,a2,a3],(sp)
## Which is the first instruction of all C compiled functions.
## Note: These definitions are repeated in hal_arch.h. If changes are required
## remember to update both sets.
#define CYGARC_JMP_BUF_SP 0
#define CYGARC_JMP_BUF_ER3 1
#define CYGARC_JMP_BUF_ER4 2
#define CYGARC_JMP_BUF_ER5 3
#define CYGARC_JMP_BUF_ER6 4
#define CYGARC_JMP_BUF_PC 5
#define CYGARC_JMP_BUF_SIZE 6
# This just preserves the callee save registers
# namely a2,a3,d2,d3
# setjmp cannot use movm to do this as we need to keep
# the sp underneath all live data at all times.
.globl CYG_LABEL_DEFN(hal_setjmp)
CYG_LABEL_DEFN(hal_setjmp): ; er0=env
mov.l er3,@(CYGARC_JMP_BUF_ER3*4,er0)
mov.l er4,@(CYGARC_JMP_BUF_ER4*4,er0)
mov.l er5,@(CYGARC_JMP_BUF_ER5*4,er0)
mov.l er6,@(CYGARC_JMP_BUF_ER6*4,er0)
mov.l @sp,er1
mov.l er1,@(CYGARC_JMP_BUF_PC*4,er0)
mov sp,er1
mov er1,@(CYGARC_JMP_BUF_SP*4,er0)
sub.l er0,er0
rts
# longjmp returns to caller of setjmp
# after restoring callee save registers
.globl CYG_LABEL_DEFN(hal_longjmp)
CYG_LABEL_DEFN(hal_longjmp):
mov.l @(CYGARC_JMP_BUF_ER3*4,er0),er3
mov.l @(CYGARC_JMP_BUF_ER4*4,er0),er4
mov.l @(CYGARC_JMP_BUF_ER5*4,er0),er5
mov.l @(CYGARC_JMP_BUF_ER6*4,er0),er6
mov.l @(CYGARC_JMP_BUF_PC*4,er0),er2
mov.l @(CYGARC_JMP_BUF_SP*4,er0),sp
mov.l er2,@sp
mov.l er1,er0
rts
#------------------------------------------------------------------------------
# end of context.S
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