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annotate packages/hal/powerpc/arch/current/src/context.S @ 66:bf00f99aec69 ecos-sw-2000-02-02

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Merge from eCos master repository on 2000-02-02-19:16:44-GMT
author jlarmour
date Wed, 02 Feb 2000 19:57:02 +0000
parents c38311975d4f
children 435cced73e2f
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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 #
0
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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/ppc.inc"
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49
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50 #------------------------------------------------------------------------------
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51 # function declaration macro
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52
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53 #define FUNC_START(name) \
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54 .type name,@function; \
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55 .globl name; \
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56 name:
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57
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58 #------------------------------------------------------------------------------
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59 # Configure to use either a minimal or maximal thread state
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60
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61 #ifdef CYGDBG_HAL_COMMON_CONTEXT_SAVE_MINIMUM
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62
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63 #define MIN_SAVE_REG 13
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64 #define MAX_SAVE_REG 31
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65
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66 .macro save_special
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67 .endm
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68
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69 .macro load_special
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70 .endm
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71 #else
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72
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73 #define MIN_SAVE_REG 6
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74 #define MAX_SAVE_REG 31
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75
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76 .macro save_special
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77 mfxer r6
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78 mfctr r7
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79 stw r6,ppcreg_xer(sp)
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80 stw r7,ppcreg_ctr(sp)
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81 .endm
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82
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83 .macro load_special
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84 lwz r6,ppcreg_xer(sp)
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85 lwz r7,ppcreg_ctr(sp)
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86 mtxer r6
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87 mtctr r7
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88 .endm
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89
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90 #endif
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91
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92 #------------------------------------------------------------------------------
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93 # hal_thread_switch_context
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94 # Switch thread contexts
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95 # R3 = address of sp of next thread to execute
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96 # R4 = address of sp save location of current thread
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97
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98
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99 FUNC_START(hal_thread_switch_context)
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100 mr r5,sp # R5 = saved stack pointer
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101 subi sp,sp,ppcreg_context_size # space for state
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102
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103 # Save registers MIN..MAX
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104 .set _reg,MIN_SAVE_REG
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105 .rept MAX_SAVE_REG+1-MIN_SAVE_REG
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106 stw _reg,(ppcreg_regs+_reg*4)(sp)
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107 .set _reg,_reg+1
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108 .endr
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109
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110 stw r0,ppcreg_regs+0*4(sp) # R0
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111 stw r5,ppcreg_regs+1*4(sp) # R5 = real SP, save in R1 slot
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112 stw r2,ppcreg_regs+2*4(sp) # R2 = TOC
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113
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114 # CR cannot be treated as a special register since GCC will only
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115 # do partial restore of CR at function exit, depending on which
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116 # of CR2, CR3, and CR4 have been used in the given function.
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117 mfcr r5 # save CR.
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118 stw r5,ppcreg_cr(sp)
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119
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120 #ifdef CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT
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121 # Make the thread context look like an exception context if thread-
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122 # aware debugging is required. This state does not need restoring.
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123 mflr r5
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124 stw r5,ppcreg_pc(sp) # pc of caller
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125 mfmsr r5
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126 stw r5,ppcreg_msr(sp) # msr (or PS)
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127 #endif
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128
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129 save_special # save special regs
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130
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131 mflr r5 # save LR == return link for this fn
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132 stw r5,ppcreg_lr(sp)
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133
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134 stw sp,0(r4) # save SP into save location
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135
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136 # Now load the destination thread by dropping through
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137 # to hal_thread_load_context
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138
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139 #------------------------------------------------------------------------------
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140 # hal_thread_load_context
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141 # Load thread context
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142 # R3 = address of sp of next thread to execute
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143 # Note that this function is also the second half of hal_thread_switch_context
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144 # and is simply dropped into from it.
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145
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146 FUNC_START(hal_thread_load_context)
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147
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148 lwz sp,0(r3) # load state directly into SP
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149
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150 load_special # load special registers
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151
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152 lwz r5,ppcreg_cr(sp) # restore CR
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153 mtcr r5
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154
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155 lwz r5,ppcreg_lr(sp) # get LR as set as return link
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156 mtlr r5
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157
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158 # Load registers MIN..MAX
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159 .set _reg,MIN_SAVE_REG
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160 .rept MAX_SAVE_REG+1-MIN_SAVE_REG
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161 lwz _reg,(ppcreg_regs+_reg*4)(sp)
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162 .set _reg,_reg+1
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163 .endr
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164
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165 lwz r0,ppcreg_regs+0*4(sp) # R0
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166 lwz r2,ppcreg_regs+2*4(sp) # R2 = TOC
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167 lwz r3,ppcreg_regs+3*4(sp) # load r3
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168
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169 lwz sp,ppcreg_regs+1*4(sp) # finally restore true SP
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170
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171 blr # jump to LR
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172
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173 #------------------------------------------------------------------------------
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174 # HAL longjmp, setjmp implementations
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175 # hal_setjmp saves only to callee save registers 13-31, r1[sp],r2, cr[2-4]
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176 # and lr into buffer supplied in r3[arg0]
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177 # Note: These definitions are repeated in hal_arch.h. If changes are required
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178 # remember to update both sets.
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179
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180 #define CYGARC_JMP_BUF_SP 0
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181 #define CYGARC_JMP_BUF_R2 1
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182 #define CYGARC_JMP_BUF_R13 2
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183 #define CYGARC_JMP_BUF_R14 3
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184 #define CYGARC_JMP_BUF_R15 4
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185 #define CYGARC_JMP_BUF_R16 5
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186 #define CYGARC_JMP_BUF_R17 6
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187 #define CYGARC_JMP_BUF_R18 7
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188 #define CYGARC_JMP_BUF_R19 8
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189 #define CYGARC_JMP_BUF_R20 9
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190 #define CYGARC_JMP_BUF_R21 10
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191 #define CYGARC_JMP_BUF_R22 11
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192 #define CYGARC_JMP_BUF_R23 12
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193 #define CYGARC_JMP_BUF_R24 13
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194 #define CYGARC_JMP_BUF_R25 14
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195 #define CYGARC_JMP_BUF_R26 15
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196 #define CYGARC_JMP_BUF_R27 16
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197 #define CYGARC_JMP_BUF_R28 17
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198 #define CYGARC_JMP_BUF_R29 18
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199 #define CYGARC_JMP_BUF_R30 19
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200 #define CYGARC_JMP_BUF_R31 20
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201 #define CYGARC_JMP_BUF_LR 21
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202 #define CYGARC_JMP_BUF_CR 22
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203
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204 #define CYGARC_JMP_BUF_SIZE 23
0
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205
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206 FUNC_START(hal_setjmp)
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207 mfcr r5
2
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208 stw r5, CYGARC_JMP_BUF_CR*4(r3)
0
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209 mflr r5
2
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210 stw r5, CYGARC_JMP_BUF_LR*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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211 stw r31,CYGARC_JMP_BUF_R31*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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212 stw r30,CYGARC_JMP_BUF_R30*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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213 stw r29,CYGARC_JMP_BUF_R29*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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214 stw r28,CYGARC_JMP_BUF_R28*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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215 stw r27,CYGARC_JMP_BUF_R27*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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216 stw r26,CYGARC_JMP_BUF_R26*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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217 stw r25,CYGARC_JMP_BUF_R25*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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218 stw r24,CYGARC_JMP_BUF_R24*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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219 stw r23,CYGARC_JMP_BUF_R23*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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220 stw r22,CYGARC_JMP_BUF_R22*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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221 stw r21,CYGARC_JMP_BUF_R21*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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222 stw r20,CYGARC_JMP_BUF_R20*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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223 stw r19,CYGARC_JMP_BUF_R19*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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224 stw r18,CYGARC_JMP_BUF_R18*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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225 stw r17,CYGARC_JMP_BUF_R17*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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226 stw r16,CYGARC_JMP_BUF_R16*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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227 stw r15,CYGARC_JMP_BUF_R15*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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228 stw r14,CYGARC_JMP_BUF_R14*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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229 stw r13,CYGARC_JMP_BUF_R13*4(r3)
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230 stw r2, CYGARC_JMP_BUF_R2*4(r3) # TOC, optimize out?
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231 stw sp, CYGARC_JMP_BUF_SP*4(r3)
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232 li r3,0 # return 0
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233 blr
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234
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235 # hal_longjmp loads state from r3[arg0] and returns
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236 # and lr into buffer supplied in r3[arg0]
2
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237
0
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238 FUNC_START(hal_longjmp)
2
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239 lwz r5,CYGARC_JMP_BUF_CR*4(r3)
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3111d98ba7b3 Initial commit of eCos version 1.1
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240 mtcr r5
2
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241 lwz r5,CYGARC_JMP_BUF_LR*4(r3)
0
3111d98ba7b3 Initial commit of eCos version 1.1
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242 mtlr r5
2
443894e2e912 Block commit of eCos version 1.2.1
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243 lwz r31,CYGARC_JMP_BUF_R31*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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244 lwz r30,CYGARC_JMP_BUF_R30*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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245 lwz r29,CYGARC_JMP_BUF_R29*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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246 lwz r28,CYGARC_JMP_BUF_R28*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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247 lwz r27,CYGARC_JMP_BUF_R27*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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248 lwz r26,CYGARC_JMP_BUF_R26*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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249 lwz r25,CYGARC_JMP_BUF_R25*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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250 lwz r24,CYGARC_JMP_BUF_R24*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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251 lwz r23,CYGARC_JMP_BUF_R23*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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252 lwz r22,CYGARC_JMP_BUF_R22*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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253 lwz r21,CYGARC_JMP_BUF_R21*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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254 lwz r20,CYGARC_JMP_BUF_R20*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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255 lwz r19,CYGARC_JMP_BUF_R19*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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256 lwz r18,CYGARC_JMP_BUF_R18*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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257 lwz r17,CYGARC_JMP_BUF_R17*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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258 lwz r16,CYGARC_JMP_BUF_R16*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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259 lwz r15,CYGARC_JMP_BUF_R15*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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260 lwz r14,CYGARC_JMP_BUF_R14*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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261 lwz r13,CYGARC_JMP_BUF_R13*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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262 lwz r2, CYGARC_JMP_BUF_R2*4(r3)
443894e2e912 Block commit of eCos version 1.2.1
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263 lwz sp, CYGARC_JMP_BUF_SP*4(r3)
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3111d98ba7b3 Initial commit of eCos version 1.1
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264 mr r3,r4 # return r4[arg1]
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265 blr
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266
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267 #------------------------------------------------------------------------------
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268 # end of context.S