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##=============================================================================##
## context.S
##
## CalmRISC16 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): msalter
## Contributors: msalter
## Date: 2001-02-12
## Purpose: CalmRISC16 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>
#------------------------------------------------------------------------------
# hal_thread_switch_context
# Switch thread contexts
# A0 = address of sp of next thread to execute
# A1 = address of sp save location of current thread
.global hal_thread_switch_context
hal_thread_switch_context:
// FIXME
# Now load the destination thread by dropping through
# to hal_thread_load_context
#------------------------------------------------------------------------------
# hal_thread_load_context
# Load thread context
# A0 = 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 hal_thread_load_context
hal_thread_load_context:
// FIXME
#------------------------------------------------------------------------------
# HAL longjmp, setjmp implementations
# hal_setjmp saves only callee save registers into given buffer
# Note: These definitions are repeated in hal_arch.h. If changes are required
# remember to update both sets.
#define CYGARC_JMP_BUF_R4 0
#define CYGARC_JMP_BUF_R5 2
#define CYGARC_JMP_BUF_A12 4
#define CYGARC_JMP_BUF_A13 8
#define CYGARC_JMP_BUF_A14 12
#define CYGARC_JMP_BUF_A15 16
#define CYGARC_JMP_BUF_SIZE 20
// FIXME: The follwing restricts us to using only 32 bit registers
// in jump buffers. If/when we move to a full 64 bit architecture,
// this will need to change, as will the instructions that we use to
// save and restore them.
#define jmpbuf_regsize 4
.globl hal_setjmp
hal_setjmp:
ldw a8,@[sp+2] // jmpbuf
ldw @[a8+0],r4
ldw @[a8+2],r5
ldw @[a8+4],a12
ldw @[a8+8],a13
ldw @[a8+12],a14
ldw @[a8+16],a15
retd
ld r0,#0
.end hal_setjmp
.globl hal_longjmp
hal_longjmp:
ldw a8,@[sp+2]
ldw r0,@[sp+6]
ldw r4,@[a8+0]
ldw r5,@[a8+2]
ldw a12,@[a8+4]
ldw a13,@[a8+8]
ldw a14,@[a8+12]
ldw a15,@[a8+16]
and r0,r0
retd
incc r0
.end hal_longjmp
#------------------------------------------------------------------------------
# end of context.S
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