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annotate packages/hal/powerpc/arch/current/src/context.S @ 76:435cced73e2f ecos-v1_3_1-release

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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
author jlarmour
date Tue, 28 Mar 2000 14:10:45 +0000
parents bf00f99aec69
children e0c0827131d1
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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 ## PowerPC context switch code
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6 ##
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7 ##=============================================================================
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8 #####COPYRIGHTBEGIN####
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9 #
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10 # -------------------------------------------
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11 # The contents of this file are subject to the Red Hat eCos Public License
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12 # Version 1.1 (the "License"); you may not use this file except in
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13 # compliance with the License. You may obtain a copy of the License at
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14 # http://www.redhat.com/
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15 #
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16 # Software distributed under the License is distributed on an "AS IS"
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17 # basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 # License for the specific language governing rights and limitations under
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19 # the License.
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20 #
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21 # The Original Code is eCos - Embedded Configurable Operating System,
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22 # released September 30, 1998.
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23 #
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24 # The Initial Developer of the Original Code is Red Hat.
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25 # Portions created by Red Hat are
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26 # Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 # All Rights Reserved.
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28 # -------------------------------------------
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29 #
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30 #####COPYRIGHTEND####
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31 ##=============================================================================
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32 #######DESCRIPTIONBEGIN####
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33 ##
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34 ## Author(s): nickg
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35 ## Contributors: nickg
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36 ## Date: 1998-04-27
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37 ## Purpose: PowerPC context switch code
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38 ## Description: This file contains implementations of the thread context
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39 ## switch routines. It also contains the longjmp() and setjmp()
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40 ## routines.
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41 ##
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42 ######DESCRIPTIONEND####
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43 ##
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44 ##=============================================================================
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45
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46 #include <pkgconf/hal.h>
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47
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48 #include <cyg/hal/arch.inc>
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49 #include <cyg/hal/ppc_offsets.inc>
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50
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51 #------------------------------------------------------------------------------
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52 # Configure to use either a minimal or maximal thread state
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53
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54 #ifdef CYGDBG_HAL_COMMON_CONTEXT_SAVE_MINIMUM
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55
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56 #define MIN_SAVE_REG 13
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57 #define MAX_SAVE_REG 31
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58
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59 .macro save_special
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60 .endm
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61
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62 .macro load_special
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63 .endm
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64 #else
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65
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66 #define MIN_SAVE_REG 6
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67 #define MAX_SAVE_REG 31
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68
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69 .macro save_special
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70 mfxer r6
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71 mfctr r7
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72 stw r6,CYGARC_PPCREG_XER(sp)
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73 stw r7,CYGARC_PPCREG_CTR(sp)
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74 .endm
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75
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76 .macro load_special
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77 lwz r6,CYGARC_PPCREG_XER(sp)
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78 lwz r7,CYGARC_PPCREG_CTR(sp)
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79 mtxer r6
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80 mtctr r7
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81 .endm
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82
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83 #endif
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84
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85 #------------------------------------------------------------------------------
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86 # hal_thread_switch_context
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87 # Switch thread contexts
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88 # R3 = address of sp of next thread to execute
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89 # R4 = address of sp save location of current thread
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90
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91
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92 FUNC_START(hal_thread_switch_context)
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93 mr r5,sp # R5 = saved stack pointer
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94 subi sp,sp,CYGARC_PPC_CONTEXT_SIZE # space for state
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95
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96 # Save registers MIN..MAX
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97 .set _reg,MIN_SAVE_REG
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98 .rept MAX_SAVE_REG+1-MIN_SAVE_REG
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99 stw _reg,(CYGARC_PPCREG_REGS+_reg*4)(sp)
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100 .set _reg,_reg+1
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101 .endr
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102
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103 stw r0,CYGARC_PPCREG_REGS+0*4(sp) # R0
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104 stw r5,CYGARC_PPCREG_REGS+1*4(sp) # R5 = real SP, save in R1 slot
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105 stw r2,CYGARC_PPCREG_REGS+2*4(sp) # R2 = TOC
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106
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107 # CR cannot be treated as a special register since GCC will only
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108 # do partial restore of CR at function exit, depending on which
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109 # of CR2, CR3, and CR4 have been used in the given function.
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110 mfcr r5 # save CR.
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111 stw r5,CYGARC_PPCREG_CR(sp)
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112
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113 #ifdef CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT
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114 # Make the thread context look like an exception context if thread-
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115 # aware debugging is required. This state does not need restoring.
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116 mflr r5
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117 stw r5,CYGARC_PPCREG_PC(sp) # pc of caller
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118 #endif
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119
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120 mfmsr r5
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121 stw r5,CYGARC_PPCREG_MSR(sp)# msr (or PS)
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122
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123 save_special # save special regs
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124
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125 mflr r5 # save LR == return link for this fn
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126 stw r5,CYGARC_PPCREG_LR(sp)
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127
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128 stw sp,0(r4) # save SP into save location
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129
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130 # Now load the destination thread by dropping through
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131 # to hal_thread_load_context
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132
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133 #------------------------------------------------------------------------------
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134 # hal_thread_load_context
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135 # Load thread context
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136 # R3 = address of sp of next thread to execute
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137 # Note that this function is also the second half of hal_thread_switch_context
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138 # and is simply dropped into from it.
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139
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140 FUNC_START(hal_thread_load_context)
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141
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142 lwz sp,0(r3) # load state directly into SP
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143
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144 load_special # load special registers
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145
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146 lwz r5,CYGARC_PPCREG_CR(sp) # restore CR
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147 mtcr r5
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148
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149 lwz r5,CYGARC_PPCREG_LR(sp) # get LR as set as return link
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150 mtlr r5
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151
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152 # Load registers MIN..MAX
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153 .set _reg,MIN_SAVE_REG
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154 .rept MAX_SAVE_REG+1-MIN_SAVE_REG
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155 lwz _reg,(CYGARC_PPCREG_REGS+_reg*4)(sp)
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156 .set _reg,_reg+1
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157 .endr
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158
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159 lwz r3,CYGARC_PPCREG_MSR(sp) # merge interrupt state
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160 hal_cpu_int_merge r3
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161
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162 lwz r0,CYGARC_PPCREG_REGS+0*4(sp) # R0
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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163 lwz r2,CYGARC_PPCREG_REGS+2*4(sp) # R2 = TOC
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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164 lwz r3,CYGARC_PPCREG_REGS+3*4(sp) # load r3
0
3111d98ba7b3 Initial commit of eCos version 1.1
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165
76
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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166 lwz sp,CYGARC_PPCREG_REGS+1*4(sp) # finally restore true SP
0
3111d98ba7b3 Initial commit of eCos version 1.1
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167
3111d98ba7b3 Initial commit of eCos version 1.1
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168 blr # jump to LR
3111d98ba7b3 Initial commit of eCos version 1.1
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169
3111d98ba7b3 Initial commit of eCos version 1.1
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170 #------------------------------------------------------------------------------
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171 # HAL longjmp, setjmp implementations
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172 # hal_setjmp saves only to callee save registers 13-31, r1[sp],r2, cr[2-4]
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173 # and lr into buffer supplied in r3[arg0]
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174
3111d98ba7b3 Initial commit of eCos version 1.1
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175 FUNC_START(hal_setjmp)
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176 mfcr r5
76
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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177 stw r5, CYGARC_JMPBUF_CR(r3)
0
3111d98ba7b3 Initial commit of eCos version 1.1
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178 mflr r5
76
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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179 stw r5, CYGARC_JMPBUF_LR(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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180 stw r31,CYGARC_JMPBUF_R31(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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181 stw r30,CYGARC_JMPBUF_R30(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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182 stw r29,CYGARC_JMPBUF_R29(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
183 stw r28,CYGARC_JMPBUF_R28(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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184 stw r27,CYGARC_JMPBUF_R27(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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185 stw r26,CYGARC_JMPBUF_R26(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
186 stw r25,CYGARC_JMPBUF_R25(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
187 stw r24,CYGARC_JMPBUF_R24(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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188 stw r23,CYGARC_JMPBUF_R23(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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189 stw r22,CYGARC_JMPBUF_R22(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
190 stw r21,CYGARC_JMPBUF_R21(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
191 stw r20,CYGARC_JMPBUF_R20(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
192 stw r19,CYGARC_JMPBUF_R19(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
193 stw r18,CYGARC_JMPBUF_R18(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
194 stw r17,CYGARC_JMPBUF_R17(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
195 stw r16,CYGARC_JMPBUF_R16(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
196 stw r15,CYGARC_JMPBUF_R15(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
197 stw r14,CYGARC_JMPBUF_R14(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
198 stw r13,CYGARC_JMPBUF_R13(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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199 stw r2, CYGARC_JMPBUF_R2(r3) # TOC, optimize out?
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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200 stw sp, CYGARC_JMPBUF_SP(r3)
0
3111d98ba7b3 Initial commit of eCos version 1.1
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201 li r3,0 # return 0
3111d98ba7b3 Initial commit of eCos version 1.1
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202 blr
3111d98ba7b3 Initial commit of eCos version 1.1
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203
3111d98ba7b3 Initial commit of eCos version 1.1
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204 # hal_longjmp loads state from r3[arg0] and returns
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205 # to the setjmp caller with r4[arg1] as return value
2
443894e2e912 Block commit of eCos version 1.2.1
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206
0
3111d98ba7b3 Initial commit of eCos version 1.1
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207 FUNC_START(hal_longjmp)
76
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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208 lwz r5,CYGARC_JMPBUF_CR(r3)
0
3111d98ba7b3 Initial commit of eCos version 1.1
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209 mtcr r5
76
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
210 lwz r5,CYGARC_JMPBUF_LR(r3)
0
3111d98ba7b3 Initial commit of eCos version 1.1
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211 mtlr r5
76
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
212 lwz r31,CYGARC_JMPBUF_R31(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
213 lwz r30,CYGARC_JMPBUF_R30(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
214 lwz r29,CYGARC_JMPBUF_R29(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
215 lwz r28,CYGARC_JMPBUF_R28(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
216 lwz r27,CYGARC_JMPBUF_R27(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
217 lwz r26,CYGARC_JMPBUF_R26(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
218 lwz r25,CYGARC_JMPBUF_R25(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
219 lwz r24,CYGARC_JMPBUF_R24(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
220 lwz r23,CYGARC_JMPBUF_R23(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
221 lwz r22,CYGARC_JMPBUF_R22(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
222 lwz r21,CYGARC_JMPBUF_R21(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
223 lwz r20,CYGARC_JMPBUF_R20(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
224 lwz r19,CYGARC_JMPBUF_R19(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
225 lwz r18,CYGARC_JMPBUF_R18(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
226 lwz r17,CYGARC_JMPBUF_R17(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
227 lwz r16,CYGARC_JMPBUF_R16(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
228 lwz r15,CYGARC_JMPBUF_R15(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
229 lwz r14,CYGARC_JMPBUF_R14(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
230 lwz r13,CYGARC_JMPBUF_R13(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
231 lwz r2, CYGARC_JMPBUF_R2(r3)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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232 lwz sp, CYGARC_JMPBUF_SP(r3)
0
3111d98ba7b3 Initial commit of eCos version 1.1
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233 mr r3,r4 # return r4[arg1]
3111d98ba7b3 Initial commit of eCos version 1.1
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234 blr
3111d98ba7b3 Initial commit of eCos version 1.1
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235
3111d98ba7b3 Initial commit of eCos version 1.1
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236 #------------------------------------------------------------------------------
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237 # end of context.S