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annotate packages/hal/sh/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
children 6ed91473a1cd
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435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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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 ## SH 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): jskov
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35 ## Contributors:jskov
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36 ## Date: 1999-05-01
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37 ## Purpose: SH 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/sh_offsets.inc>
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50 #include <cyg/hal/basetype.h> // CYG_LABEL_NAME
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51
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52 #------------------------------------------------------------------------------
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53 # Register allocation for the Hitachi calling convention:
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54 #
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55 # r0 arg return
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56 # r1..r3 scratch
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57 # r4..r7 args in
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58 # r8..r13 call saved
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59 # r14 frame pointer/call saved
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60 # r15 stack pointer
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61 # ap arg pointer (doesn''t really exist, always eliminated)
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62 # pr subroutine return address
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63 # t t bit
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64 # mach multiply/accumulate result, high part
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65 # macl multiply/accumulate result, low part.
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66 # fpul fp/int communication register
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67 # rap return address pointer register
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68 # fr0 fp arg return
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69 # fr1..fr3 scratch floating point registers
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70 # fr4..fr11 fp args in
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71 # fr12..fr15 call saved floating point registers
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72 #------------------------------------------------------------------------------
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73
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74 #------------------------------------------------------------------------------
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75 # function declaration macro
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76
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77 #define FUNC_START(name) \
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78 .type CYG_LABEL_NAME(name),@function; \
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79 .globl CYG_LABEL_NAME(name); \
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80 CYG_LABEL_NAME(name):
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81
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82 #------------------------------------------------------------------------------
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83 # hal_thread_switch_context
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84 # Switch thread contexts
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85 # R4 = address of sp of next thread to execute
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86 # R5 = address of sp save location of current thread
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87
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88 # Need to save r8-r13, r14 (fp), r15 (sp), pr, mach, macl
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89
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90 FUNC_START(hal_thread_switch_context)
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91 mov r15, r0 ! R0 = saved stack pointer
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92
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93 sts.l pr,@-r15 ! save caller in PC slot so it looks
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94 ! sensible when GDB examines it
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95 stc sr,r1
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96 mov.l r1,@-r15
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97
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98 sts.l pr,@-r15 ! return address
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99 sts.l macl,@-r15 ! macl
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100 sts.l mach,@-r15 ! mach
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101 mov.l r0,@-r15 ! saved r15 (entry sp)
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102 mov.l r14,@-r15 ! r14-r0
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103 mov.l r13,@-r15
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104 mov.l r12,@-r15
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105 mov.l r11,@-r15
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106 mov.l r10,@-r15
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107 mov.l r9,@-r15
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108 mov.l r8,@-r15
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109 mov.l r7,@-r15
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110 mov.l r6,@-r15
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111 mov.l r5,@-r15
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112 mov.l r4,@-r15
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113 mov.l r3,@-r15
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114 mov.l r2,@-r15
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115 mov.l r1,@-r15
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116 mov.l r0,@-r15
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117
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118 mov.l r15,@r5 ! save SP into save location
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119
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120 # Now load the destination thread by dropping through
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121 # to hal_thread_load_context
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122
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123 #------------------------------------------------------------------------------
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124 # hal_thread_load_context
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125 # Load thread context
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126 # R4 = address of sp of next thread to execute
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127 # Note that this function is also the second half of hal_thread_switch_context
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128 # and is simply dropped into from it.
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129
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130 FUNC_START(hal_thread_load_context)
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131
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132 mov.l @r4,r0
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133
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134 add #4+4,r0 ! skip r0 and r1
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135 !mov.l @r0+,r0
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136 !mov.l @r0+,r1
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137 mov.l @r0+,r2
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138 mov.l @r0+,r3
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139 mov.l @r0+,r4
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140 mov.l @r0+,r5
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141 mov.l @r0+,r6
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142 mov.l @r0+,r7
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143 mov.l @r0+,r8
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144 mov.l @r0+,r9
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145 mov.l @r0+,r10
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146 mov.l @r0+,r11
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147 mov.l @r0+,r12
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148 mov.l @r0+,r13
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149 mov.l @r0+,r14
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150 mov.l @r0+,r3 ! New SP.
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151
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152 lds.l @r0+,mach ! mach
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153 lds.l @r0+,macl ! macl
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154 lds.l @r0+,pr ! pr
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155
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156 mov.l @r0+,r2 ! SR
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157 hal_cpu_int_merge r2,r0,r1 ! restore interrupt state
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158
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159 mov r3,r15 ! update stack pointer
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160 rts ! and return
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161 nop
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162
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163 #------------------------------------------------------------------------------
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164 # HAL longjmp, setjmp implementations
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165 # hal_setjmp saves only to callee save registers r8-r13, r14(fp), r15(sp)
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166 # and pr into buffer supplied in r4[arg0]
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167
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168 FUNC_START(hal_setjmp)
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169 mov.l r15,@(CYGARC_JMPBUF_SP,r4)
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170 sts pr,r0
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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171 mov.l r0,@(CYGARC_JMPBUF_PR,r4)
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172 mov.l r8,@(CYGARC_JMPBUF_R8,r4)
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173 mov.l r9,@(CYGARC_JMPBUF_R9,r4)
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174 mov.l r10,@(CYGARC_JMPBUF_R10,r4)
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175 mov.l r11,@(CYGARC_JMPBUF_R11,r4)
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176 mov.l r12,@(CYGARC_JMPBUF_R12,r4)
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177 mov.l r13,@(CYGARC_JMPBUF_R13,r4)
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178 mov.l r14,@(CYGARC_JMPBUF_R14,r4)
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179
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180 mov #0,r0 ! return 0
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181 rts
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182 nop
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183
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184 # hal_longjmp loads state from r4[arg0] and returns
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185 # argument supplied in r5[arg1]
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186
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187 FUNC_START(hal_longjmp)
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188 mov.l @(CYGARC_JMPBUF_SP,r4),r15
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189 mov.l @(CYGARC_JMPBUF_PR,r4),r0
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190 lds r0,pr
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191 mov.l @(CYGARC_JMPBUF_R8,r4),r8
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192 mov.l @(CYGARC_JMPBUF_R9,r4),r9
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193 mov.l @(CYGARC_JMPBUF_R10,r4),r10
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194 mov.l @(CYGARC_JMPBUF_R11,r4),r11
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195 mov.l @(CYGARC_JMPBUF_R12,r4),r12
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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196 mov.l @(CYGARC_JMPBUF_R13,r4),r13
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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197 mov.l @(CYGARC_JMPBUF_R14,r4),r14
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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198
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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199 mov r5,r0
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200 rts
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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201 nop
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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202
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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203 #------------------------------------------------------------------------------
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204 # end of context.S