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annotate packages/hal/v85x/v850/current/src/context.S @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents b15c60e34c84
children d2c90368aeef
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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 // # NEC/V850 context switch code
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6 // #
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7 // #=============================================================================
208
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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 Red Hat, 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 version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
96
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40 // #=============================================================================
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41 // ######DESCRIPTIONBEGIN####
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42 // #
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43 // # Author(s): nickg, gthomas
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44 // # Contributors: nickg, gthomas
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45 // # Date: 1998-09-15
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46 // # Purpose: NEC/V850 context switch code
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47 // # Description: This file contains implementations of the thread context
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48 // # switch routines. It also contains the longjmp() and setjmp() 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/nec_offsets.inc>
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57
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58 .text
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59
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60 // ------------------------------------------------------------------------------
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61 // hal_thread_switch_context
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62 // Switch thread contexts
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63 // R6 = address of sp of next thread to execute
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64 // R7 = address of sp save location of current thread
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65 .globl __hal_thread_switch_context
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66 __hal_thread_switch_context:
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67 addi -CYGARC_EXCEPTION_FRAME_SIZE,sp,sp
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68 st.w ep,CYGARC_REG_EP[sp]
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69 mov sp,ep
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70 sst.w r1,CYGARC_REG_R1[ep]
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71 sst.w r2,CYGARC_REG_R2[ep]
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72 addi CYGARC_EXCEPTION_FRAME_SIZE,ep,r1
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73 sst.w r1,CYGARC_REG_SP[ep] // sp
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74 sst.w r4,CYGARC_REG_R4[ep]
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75 sst.w r5,CYGARC_REG_R5[ep]
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76 sst.w r6,CYGARC_REG_R6[ep]
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77 sst.w r7,CYGARC_REG_R7[ep]
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78 sst.w r8,CYGARC_REG_R8[ep]
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79 sst.w r9,CYGARC_REG_R9[ep]
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80 sst.w r10,CYGARC_REG_R10[ep]
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81 sst.w r11,CYGARC_REG_R11[ep]
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82 sst.w r12,CYGARC_REG_R12[ep]
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83 sst.w r13,CYGARC_REG_R13[ep]
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84 sst.w r14,CYGARC_REG_R14[ep]
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85 sst.w r15,CYGARC_REG_R15[ep]
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86 sst.w r16,CYGARC_REG_R16[ep]
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87 sst.w r17,CYGARC_REG_R17[ep]
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88 sst.w r18,CYGARC_REG_R18[ep]
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89 sst.w r19,CYGARC_REG_R19[ep]
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90 sst.w r20,CYGARC_REG_R20[ep]
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91 sst.w r21,CYGARC_REG_R21[ep]
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92 sst.w r22,CYGARC_REG_R22[ep]
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93 sst.w r23,CYGARC_REG_R23[ep]
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94 sst.w r24,CYGARC_REG_R24[ep]
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95 sst.w r25,CYGARC_REG_R25[ep]
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96 sst.w r26,CYGARC_REG_R26[ep]
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97 sst.w r27,CYGARC_REG_R27[ep]
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98 sst.w r28,CYGARC_REG_R28[ep]
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99 sst.w r29,CYGARC_REG_R29[ep]
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100 sst.w lp,CYGARC_REG_LP[ep]
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101 sst.w lp,CYGARC_REG_PC[ep]
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102 stsr PSW,r1
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103 st.w r1,CYGARC_REG_PSW[ep]
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104 st.w sp,0[r7] // return new stack pointer
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105
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106 # Now load the destination thread by dropping through
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107 # to hal_thread_load_context
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108 // ------------------------------------------------------------------------------
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109 // hal_thread_load_context
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110 // Load thread context
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111 // R6 = address of sp of next thread to execute
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112 // Note that this function is also the second half of hal_thread_switch_context
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113 // and is simply dropped into from it.
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114
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115 .globl __hal_thread_load_context
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116 __hal_thread_load_context:
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117 di // disable interrupts while updating state
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118 ld.w 0[r6],ep // get pointer to saved state
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119 ld.w CYGARC_REG_PSW[ep],r6
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120 sld.w CYGARC_REG_LP[ep],r7
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121 sld.w CYGARC_REG_R1[ep],r1 // restore volatile registers
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122 sld.w CYGARC_REG_R2[ep],r2
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123 ldsr r6,EIPSW // avoids pipline bubble
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124 ldsr r7,EIPC
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125 sld.w CYGARC_REG_R4[ep],r4
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126 sld.w CYGARC_REG_R5[ep],r5
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127 sld.w CYGARC_REG_R6[ep],r6
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128 sld.w CYGARC_REG_R7[ep],r7
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129 sld.w CYGARC_REG_R8[ep],r8
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130 sld.w CYGARC_REG_R9[ep],r9
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131 sld.w CYGARC_REG_R10[ep],r10
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132 sld.w CYGARC_REG_R11[ep],r11
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133 sld.w CYGARC_REG_R12[ep],r12
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134 sld.w CYGARC_REG_R13[ep],r13
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135 sld.w CYGARC_REG_R14[ep],r14
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136 sld.w CYGARC_REG_R15[ep],r15
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137 sld.w CYGARC_REG_R16[ep],r16
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138 sld.w CYGARC_REG_R17[ep],r17
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139 sld.w CYGARC_REG_R18[ep],r18
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140 sld.w CYGARC_REG_R19[ep],r19
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141 sld.w CYGARC_REG_R20[ep],r20
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142 sld.w CYGARC_REG_R21[ep],r21
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143 sld.w CYGARC_REG_R22[ep],r22
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144 sld.w CYGARC_REG_R23[ep],r23
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145 sld.w CYGARC_REG_R24[ep],r24
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146 sld.w CYGARC_REG_R25[ep],r25
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147 sld.w CYGARC_REG_R26[ep],r26
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148 sld.w CYGARC_REG_R27[ep],r27
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149 sld.w CYGARC_REG_R28[ep],r28
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150 sld.w CYGARC_REG_R29[ep],r29
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151 sld.w CYGARC_REG_LP[ep],lp
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152 sld.w CYGARC_REG_SP[ep],sp
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153 sld.w CYGARC_REG_EP[ep],ep
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154 reti
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155
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156 // ------------------------------------------------------------------------------
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157 // HAL longjmp, setjmp implementations
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158
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159 #define fp r29
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160
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161 .globl _hal_setjmp
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162 _hal_setjmp:
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163 st.w r1,CYGARC_JMPBUF_R1[r6]
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164 st.w r2,CYGARC_JMPBUF_R2[r6]
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165 st.w r4,CYGARC_JMPBUF_R4[r6]
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166 st.w r5,CYGARC_JMPBUF_R5[r6]
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167 st.w sp,CYGARC_JMPBUF_SP[r6]
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168 st.w gp,CYGARC_JMPBUF_GP[r6]
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169 st.w tp,CYGARC_JMPBUF_TP[r6]
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170 st.w r20,CYGARC_JMPBUF_R20[r6]
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171 st.w r21,CYGARC_JMPBUF_R21[r6]
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172 st.w r22,CYGARC_JMPBUF_R22[r6]
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173 st.w r23,CYGARC_JMPBUF_R23[r6]
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174 st.w r24,CYGARC_JMPBUF_R24[r6]
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175 st.w r25,CYGARC_JMPBUF_R25[r6]
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176 st.w r26,CYGARC_JMPBUF_R26[r6]
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177 st.w r27,CYGARC_JMPBUF_R27[r6]
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178 st.w r28,CYGARC_JMPBUF_R28[r6]
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179 st.w fp,CYGARC_JMPBUF_FP[r6]
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180 st.w ep,CYGARC_JMPBUF_EP[r6]
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181 st.w lp,CYGARC_JMPBUF_LP[r6]
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182 mov r0,r10
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183 jmp [lp]
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184
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185 // hal_longjmp loads state from [arg0] and returns arg1
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186
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187 .globl _hal_longjmp
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188 _hal_longjmp:
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189 ld.w CYGARC_JMPBUF_SP[r6],sp
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190 ld.w CYGARC_JMPBUF_GP[r6],gp
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191 ld.w CYGARC_JMPBUF_TP[r6],tp
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192 ld.w CYGARC_JMPBUF_R1[r6],r1
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193 ld.w CYGARC_JMPBUF_R2[r6],r2
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194 ld.w CYGARC_JMPBUF_R4[r6],r4
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195 ld.w CYGARC_JMPBUF_R5[r6],r5
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196 ld.w CYGARC_JMPBUF_R20[r6],r20
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197 ld.w CYGARC_JMPBUF_R21[r6],r21
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198 ld.w CYGARC_JMPBUF_R22[r6],r22
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199 ld.w CYGARC_JMPBUF_R23[r6],r23
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200 ld.w CYGARC_JMPBUF_R24[r6],r24
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201 ld.w CYGARC_JMPBUF_R25[r6],r25
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202 ld.w CYGARC_JMPBUF_R26[r6],r26
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203 ld.w CYGARC_JMPBUF_R27[r6],r27
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204 ld.w CYGARC_JMPBUF_R28[r6],r28
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205 ld.w CYGARC_JMPBUF_FP[r6],fp
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206 ld.w CYGARC_JMPBUF_EP[r6],ep
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207 ld.w CYGARC_JMPBUF_LP[r6],lp
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208 mov r7,r10
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209 jmp [lp]
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210
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211 // ------------------------------------------------------------------------------
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212 // end of context.S
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213
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214