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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents 74dbf4c3f2e1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 ## MN10300 context switch code
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6 ##
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7 ##=============================================================================
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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 Free Software Foundation, 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
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16 ## version.
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17 ##
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18 ## eCos is distributed in the hope that it will be useful, but WITHOUT
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19 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 ## for more details.
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22 ##
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23 ## You should have received a copy of the GNU General Public License
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24 ## along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 ## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 ##
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27 ## As a special exception, if other files instantiate templates or use
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28 ## macros or inline functions from this file, or you compile this file
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29 ## and link it with other works to produce a work based on this file,
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30 ## this file does not by itself cause the resulting work to be covered by
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31 ## the GNU General Public License. However the source code for this file
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32 ## must still be made available in accordance with section (3) of the GNU
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33 ## General Public License v2.
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34 ##
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35 ## This exception does not invalidate any other reasons why a work based
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36 ## on this file might be covered by the GNU General Public License.
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37 ## -------------------------------------------
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38 ## ####ECOSGPLCOPYRIGHTEND####
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39 ##=============================================================================
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40 #######DESCRIPTIONBEGIN####
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41 ##
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42 ## Author(s): nickg
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43 ## Contributors: nickg
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44 ## Date: 1998-04-27
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45 ## Purpose: MN10300 context switch code
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46 ## Description: This file contains implementations of the thread context
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47 ## switch routines. It also contains the longjmp() and setjmp()
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48 ## 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/arch.inc>
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57
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58 #------------------------------------------------------------------------------
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59 # hal_thread_switch_context
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60 # Switch thread contexts
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61 # D0 = address of sp of next thread to execute
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62 # D1 = address of sp save location of current thread
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63
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64 .global _hal_thread_switch_context
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65 _hal_thread_switch_context:
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66 add -8,sp # space for SP and PSW
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67 mov d2,a0 # move d2->a0 since PSW can only be
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68 # saved to a data register
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69 hal_cpu_get_psw d2 # save PSW to d2
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70 mov d2,(4,sp) # store in stack loc
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71 mov a0,d2 # retrieve old d2 value
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72 hal_cpu_save_all # save entire register set
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73 mov d1,a2 # move save loc addr to A2
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74 mov sp,(0,a2) # store SP in save location
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75
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76 # Now load the destination thread by dropping through
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77 # to hal_thread_load_context
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78
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79 #------------------------------------------------------------------------------
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80 # hal_thread_load_context
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81 # Load thread context
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82 # D0 = address of sp of next thread to execute
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83 # Note that this function is also the second half of hal_thread_switch_context
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84 # and is simply dropped into from it.
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85
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86 .global _hal_thread_load_context
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87 _hal_thread_load_context:
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88
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89 mov d0,a2 # move next sp loc to a2
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90 mov (0,a2),sp # load SP with new value
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91 hal_cpu_load_all # load whole register set
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92 mov (4,sp),d1 # retrieve saved PSW
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93 hal_cpu_set_psw d1 # and restore it
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94 add 8,sp # skip saved SP and PSW
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95 ret [],0 # and return
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96
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97 ##-----------------------------------------------------------------------------
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98 ## HAL longjmp(), setjmp() implementations
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99 ## These implementations omit the usual movm [d2,d3,a2,a3],(sp)
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100 ## Which is the first instruction of all C compiled functions.
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101 ## Note: These definitions are repeated in hal_arch.h. If changes are required
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102 ## remember to update both sets.
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103
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104 #define CYGARC_JMP_BUF_SP 0
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105 #define CYGARC_JMP_BUF_D2 1
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106 #define CYGARC_JMP_BUF_D3 2
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107 #define CYGARC_JMP_BUF_A2 3
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108 #define CYGARC_JMP_BUF_A3 4
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109 #define CYGARC_JMP_BUF_LR 5
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110
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111 #define CYGARC_JMP_BUF_SIZE 6
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112
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113
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114 # This just preserves the callee save registers
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115 # namely a2,a3,d2,d3
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116 # setjmp cannot use movm to do this as we need to keep
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117 # the sp underneath all live data at all times.
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118 .globl _hal_setjmp
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119 _hal_setjmp: # d0=env
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120 mov d0,a0 # env
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121 mov d2,(CYGARC_JMP_BUF_D2*4,a0)
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122 mov d3,(CYGARC_JMP_BUF_D3*4,a0)
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123 mov a2,(CYGARC_JMP_BUF_A2*4,a0)
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124 mov a3,(CYGARC_JMP_BUF_A3*4,a0)
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125 mov mdr,d1 # link saved by call (also in (0,sp))
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126 mov d1,(CYGARC_JMP_BUF_LR*4,a0)
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127 mov sp,a1
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128 mov a1,(CYGARC_JMP_BUF_SP*4,a0) # a1==(caller''s sp)
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129 clr d0 # return 0
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130 ret [],0
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131
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132 # longjmp returns to caller of setjmp
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133 # after restoring callee save registers
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134 .globl _hal_longjmp
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135 _hal_longjmp:
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136 mov d0,a0
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137 mov (CYGARC_JMP_BUF_D2*4,a0),d2
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138 mov (CYGARC_JMP_BUF_D3*4,a0),d3
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139 mov (CYGARC_JMP_BUF_A2*4,a0),a2
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140 mov (CYGARC_JMP_BUF_A3*4,a0),a3
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141 mov (CYGARC_JMP_BUF_LR*4,a0),d0
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142 ## mov d0,mdr
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143 mov (CYGARC_JMP_BUF_SP*4,a0),a1 # stashed (caller''s sp)
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144 mov a1,sp
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145 mov d0,(0,sp) # put link on stack
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146 mov d1,d0 # return arg1
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147 ret [],0 # this ignores (0,sp) and does pc=mdr
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148
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149
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150 #------------------------------------------------------------------------------
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151 # end of context.S
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152
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