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annotate packages/hal/h8300/arch/current/src/context.S @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents 10851723ceff
children
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1 ##=============================================================================
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2 ##
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3 ## context.S
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4 ##
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5 ## H8/300 context switch code
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6 ##
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7 ##=============================================================================
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8 ## ####ECOSGPLCOPYRIGHTBEGIN####
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9 ## -------------------------------------------
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10 ## This file is part of eCos, the Embedded Configurable Operating System.
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11 ## Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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12 ##
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13 ## eCos is free software; you can redistribute it and/or modify it under
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14 ## the terms of the GNU General Public License as published by the Free
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15 ## Software Foundation; either version 2 or (at your option) any later
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16 ## version.
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17 ##
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18 ## eCos is distributed in the hope that it will be useful, but WITHOUT
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19 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 ## for more details.
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22 ##
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23 ## You should have received a copy of the GNU General Public License
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24 ## along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 ## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 ##
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27 ## As a special exception, if other files instantiate templates or use
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28 ## macros or inline functions from this file, or you compile this file
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29 ## and link it with other works to produce a work based on this file,
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30 ## this file does not by itself cause the resulting work to be covered by
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31 ## the GNU General Public License. However the source code for this file
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32 ## must still be made available in accordance with section (3) of the GNU
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33 ## General Public License v2.
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34 ##
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35 ## This exception does not invalidate any other reasons why a work based
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36 ## on this file might be covered by the GNU General Public License.
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37 ## -------------------------------------------
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38 ## ####ECOSGPLCOPYRIGHTEND####
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39 ##=============================================================================
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40 #######DESCRIPTIONBEGIN####
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41 ##
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42 ## Author(s): yoshinori sato
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43 ## Contributors: yoshinori sato
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44 ## Date: 2002-02-17
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45 ## Purpose: H8/300 context switch code
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46 ## Description: This file contains implementations of the thread context
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47 ## switch routines. It also contains the longjmp() and setjmp()
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48 ## routines.
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49 ##
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50 ######DESCRIPTIONEND####
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51 ##
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52 ##=============================================================================
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53
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54 #include <pkgconf/hal.h>
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55
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56 #include <cyg/hal/arch.inc>
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57 #include <cyg/hal/basetype.h>
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58
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59
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60 #ifdef CYGPKG_HAL_H8300_H8300H
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61 .h8300h
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62 #endif
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63 #ifdef CYGPKG_HAL_H8300_H8S
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64 .h8300s
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65 #endif
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66
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67 #------------------------------------------------------------------------------
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68 # hal_thread_switch_context
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69 # Switch thread contexts
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70 # er0 = address of sp of next thread to execute
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71 # er1 = address of sp save location of current thread
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72
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73 .global CYG_LABEL_DEFN(hal_thread_switch_context)
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74 CYG_LABEL_DEFN(hal_thread_switch_context):
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75 mov.w @sp,r2 ; save ccr
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76 stc ccr,r2h
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77 mov.w r2,@sp
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78 hal_cpu_save_context
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79 mov.l sp,@er1
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80
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81 # Now load the destination thread by dropping through
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82 # to hal_thread_load_context
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83
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84 #------------------------------------------------------------------------------
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85 # hal_thread_load_context
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86 # Load thread context
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87 # D0 = address of sp of next thread to execute
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88 # Note that this function is also the second half of hal_thread_switch_context
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89 # and is simply dropped into from it.
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90
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91 .global CYG_LABEL_DEFN(hal_thread_load_context)
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92 CYG_LABEL_DEFN(hal_thread_load_context):
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93
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94 mov.l @er0,sp
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95 hal_cpu_load_all
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96 rte
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97
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98 ##-----------------------------------------------------------------------------
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99 ## HAL longjmp(), setjmp() implementations
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100 ## These implementations omit the usual movm [d2,d3,a2,a3],(sp)
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101 ## Which is the first instruction of all C compiled functions.
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102 ## Note: These definitions are repeated in hal_arch.h. If changes are required
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103 ## remember to update both sets.
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104
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105 #define CYGARC_JMP_BUF_SP 0
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106 #define CYGARC_JMP_BUF_ER3 1
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107 #define CYGARC_JMP_BUF_ER4 2
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108 #define CYGARC_JMP_BUF_ER5 3
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109 #define CYGARC_JMP_BUF_ER6 4
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110 #define CYGARC_JMP_BUF_PC 5
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111
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112 #define CYGARC_JMP_BUF_SIZE 6
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113
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114
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115 # This just preserves the callee save registers
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116 # namely a2,a3,d2,d3
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117 # setjmp cannot use movm to do this as we need to keep
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118 # the sp underneath all live data at all times.
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119 .globl CYG_LABEL_DEFN(hal_setjmp)
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120 CYG_LABEL_DEFN(hal_setjmp): ; er0=env
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121 mov.l er3,@(CYGARC_JMP_BUF_ER3*4,er0)
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122 mov.l er4,@(CYGARC_JMP_BUF_ER4*4,er0)
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123 mov.l er5,@(CYGARC_JMP_BUF_ER5*4,er0)
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124 mov.l er6,@(CYGARC_JMP_BUF_ER6*4,er0)
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125 mov.l @sp,er1
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126 mov.l er1,@(CYGARC_JMP_BUF_PC*4,er0)
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127 mov sp,er1
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128 mov er1,@(CYGARC_JMP_BUF_SP*4,er0)
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129 sub.l er0,er0
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130 rts
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131
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132 # longjmp returns to caller of setjmp
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133 # after restoring callee save registers
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134 .globl CYG_LABEL_DEFN(hal_longjmp)
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135 CYG_LABEL_DEFN(hal_longjmp):
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136 mov.l @(CYGARC_JMP_BUF_ER3*4,er0),er3
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137 mov.l @(CYGARC_JMP_BUF_ER4*4,er0),er4
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138 mov.l @(CYGARC_JMP_BUF_ER5*4,er0),er5
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139 mov.l @(CYGARC_JMP_BUF_ER6*4,er0),er6
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140 mov.l @(CYGARC_JMP_BUF_PC*4,er0),er2
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141 mov.l @(CYGARC_JMP_BUF_SP*4,er0),sp
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jlarmour
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142 mov.l er2,@sp
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143 mov.l er1,er0
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144 rts
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145
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146
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147 #------------------------------------------------------------------------------
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148 # end of context.S
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149
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150