Mercurial > flash_v2
annotate packages/hal/sh/arch/current/src/context.S @ 134:d2f49caf9e38 ecos-sw-2000-11-03
Merge from eCos master repository on 2000-11-03-09:00:49-GMT
| author | jlarmour |
|---|---|
| date | Fri, 03 Nov 2000 21:17:40 +0000 |
| parents | 6ed91473a1cd |
| children | 289bf90c6a9b |
| rev | line source |
|---|---|
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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_DEFN |
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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_DEFN(name),@function; \ |
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79 .globl CYG_LABEL_DEFN(name); \ |
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80 CYG_LABEL_DEFN(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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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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143 mov.l @r0+,r8 |
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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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144 mov.l @r0+,r9 |
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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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145 mov.l @r0+,r10 |
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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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146 mov.l @r0+,r11 |
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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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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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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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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 |
|
435cced73e2f
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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 |
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171 mov.l r0,@(CYGARC_JMPBUF_PR,r4) |
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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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172 mov.l r8,@(CYGARC_JMPBUF_R8,r4) |
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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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173 mov.l r9,@(CYGARC_JMPBUF_R9,r4) |
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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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174 mov.l r10,@(CYGARC_JMPBUF_R10,r4) |
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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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|
175 mov.l r11,@(CYGARC_JMPBUF_R11,r4) |
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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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|
176 mov.l r12,@(CYGARC_JMPBUF_R12,r4) |
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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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177 mov.l r13,@(CYGARC_JMPBUF_R13,r4) |
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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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178 mov.l r14,@(CYGARC_JMPBUF_R14,r4) |
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|
179 |
|
435cced73e2f
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180 mov #0,r0 ! return 0 |
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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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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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435cced73e2f
eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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189 mov.l @(CYGARC_JMPBUF_PR,r4),r0 |
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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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190 lds r0,pr |
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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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191 mov.l @(CYGARC_JMPBUF_R8,r4),r8 |
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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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|
192 mov.l @(CYGARC_JMPBUF_R9,r4),r9 |
|
435cced73e2f
eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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|
193 mov.l @(CYGARC_JMPBUF_R10,r4),r10 |
|
435cced73e2f
eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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|
194 mov.l @(CYGARC_JMPBUF_R11,r4),r11 |
|
435cced73e2f
eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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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 |
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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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|
198 |
|
435cced73e2f
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|
199 mov r5,r0 |
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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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|
200 rts |
|
435cced73e2f
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|
201 nop |
|
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|
202 |
|
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|
203 #------------------------------------------------------------------------------ |
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204 # end of context.S |