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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 // vec_xvsr.S
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4 //
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5 // SPARC vectors: exception vector service routine
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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): hmt
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43 // Contributors: hmt
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44 // Date: 1999-02-20
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45 // Purpose: SPARC vector code
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46 // Description: see vectors.S; this is the default vector service routine
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47 // for exceptions.
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48 //
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49 //####DESCRIPTIONEND####
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50 //
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51 //=========================================================================*/
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52
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53 !-----------------------------------------------------------------------------
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54
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55 // .file "vec_xvsr.S"
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56
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57 !----------------------------------------------------------------------------
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58
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59 #include <pkgconf/system.h>
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60 #include <pkgconf/hal.h>
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61
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62 #ifdef CYGPKG_KERNEL
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63 # include <pkgconf/kernel.h>
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64 #endif
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65
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66 !------------------------------------------------------------------------
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67
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68 #include <cyg/hal/vectors.h>
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69
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70 #define DELAYS_AFTER_WRPSR_SAME_WINDOW
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71 #define DELAYS_AFTER_WRWIM
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72
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73 !------------------------------------------------------------------------
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74
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75 .text
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76
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77 !---------------------------------------------------------------------------
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78 ! default exception handler VSR, which calls the appropriate ISR after
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79 ! interrupt masking - much the same as the interrupt VSR but does not lock
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80 ! scheduler or call interrupt_end().
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81
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82 .global hal_default_exception_vsr
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83 hal_default_exception_vsr:
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84 ! here,locals have been set up as follows:
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85 ! %l0 = psr (with this CWP/window-level in it)
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86 ! %l1 = pc
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87 ! %l2 = npc
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88 ! %l3 = vector number (16-25 for traps)
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89 ! and we are in our own register window, though it is likely that
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90 ! the next one will need to be saved before we can use it:
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91 ! ie. this one is the invalid register window.
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92
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93 ! must establish a safe stack before re-enabling interrupts + traps
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94 and %l0, __WINBITS, %l7 ! CWP extracted
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95 ! no inc/dec here, so no need for special measures for not-8-windows
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96 mov 1, %l6
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97 sll %l6, %l7, %l6 ! 1 << CWP
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98 rd %wim, %l5
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99 cmp %l5, %l6 ! are they the same?
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100 bne 1f ! No, so the stack is OK as is.
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101
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102 ! now do by hand an overflow trap, effectively
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103 mov %g1, %l7 ! (DELAY SLOT)
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104 srl %l5, 1, %l5
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105 sll %l6, __WINSIZE-1, %l6
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106 or %l6, %l5, %g1 ! new WIM in %g1 so we can get it
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107 ! within the save:
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108 save ! Slip into next window
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109 mov %g1, %wim ! Install the new wim
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110 ! (invalidates current window!)
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111 #ifdef DELAYS_AFTER_WRWIM
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112 nop
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113 nop
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114 nop
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115 #endif
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116
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117 std %l0, [%sp + 0 * 4] ! save L & I registers
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118 std %l2, [%sp + 2 * 4]
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119 std %l4, [%sp + 4 * 4]
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120 std %l6, [%sp + 6 * 4]
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121
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122 std %i0, [%sp + 8 * 4]
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123 std %i2, [%sp + 10 * 4]
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124 std %i4, [%sp + 12 * 4]
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125 std %i6, [%sp + 14 * 4]
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126
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127 restore ! Go back to trap window.
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128 mov %l7, %g1 ! Restore %g1
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129
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130 1: ! now save away the regs we must preserve
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131 sub %fp, 32 * 4, %sp
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132 ! save a maximal context regardless: see also
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133 ! CYGDBG_HAL_COMMON_INTERRUPTS_SAVE_MINIMUM_CONTEXT
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134 std %l0, [%sp + 0 * 4] ! save L & I registers
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135 std %l2, [%sp + 2 * 4]
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136 std %l4, [%sp + 4 * 4]
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137 std %l6, [%sp + 6 * 4]
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138
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139 std %i0, [%sp + 8 * 4]
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140 std %i2, [%sp + 10 * 4]
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141 std %i4, [%sp + 12 * 4]
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142 std %i6, [%sp + 14 * 4]
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143
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144 st %g1, [%sp + 17 * 4] ! save G registers
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145 std %g2, [%sp + 18 * 4]
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146 std %g4, [%sp + 20 * 4]
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147 std %g6, [%sp + 22 * 4]
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148
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149 ! no point whatsoever in saving O registers
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150
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151 ! and save the CWP in %g0 save place
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152 st %l0, [%sp + 16 * 4]
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153
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154 sub %sp, 24 * 4, %sp ! fresh frame including
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155 ! arg spill area for callees
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156
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157 ! do not lock the scheduler
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158
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159 ! HELP_GDB_WITH_BACKTRACE
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160 mov %i7, %l5 ! preserve it JIC
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161 mov %l1, %i7 ! bogus return link here
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162
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163 ! and we must preserve the Y register (multiply/divide auxiliary)
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164 ! over these calls; we will keep it in %l4 which is otherwise unused.
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165 rd %y, %l4
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166
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167 ! Now we can reenable traps (preserving interrupt level)
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168 or %l0, 0x0e0, %l7 ! set ET (+S,PS), preserve PIL
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169 wr %l7, %psr ! and enable!
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170 #ifdef DELAYS_AFTER_WRPSR_SAME_WINDOW
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171 nop
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172 nop
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173 nop
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174 #endif
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175 ! now call the XSR and so on with the appropriate args:
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176 ! ie.
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177 ! isr_retcode = (*(hal_interrupt_handlers[ vector ]))
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178 ! ( vector, hal_interrupt_data[ vector ], stackp );
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179
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180 ! from hal_arch.h
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181 !// ISR tables
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182 !CYG_ADDRESS hal_interrupt_handlers[CYGNUM_HAL_ISR_COUNT];
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183 !CYG_ADDRWORD hal_interrupt_data[CYGNUM_HAL_ISR_COUNT];
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184 !CYG_ADDRESS hal_interrupt_objects[CYGNUM_HAL_ISR_COUNT];
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185
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186 mov %l3, %o0
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187 sll %l3, 2, %l3 ! %l3 to a word offset
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188 sethi %hi(hal_interrupt_data), %l7
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189 or %l7, %lo(hal_interrupt_data), %l7
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190 ld [ %l7 + %l3 ], %o1 ! data
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191 add %sp, 24 * 4, %o2 ! stackpointer of saved regset
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192
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193 sethi %hi(hal_interrupt_handlers), %l7
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194 or %l7, %lo(hal_interrupt_handlers), %l7
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195 ld [ %l7 + %l3 ], %l6
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196 call %l6
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197 nop
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198
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199 ! do not call _interrupt_end()
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200
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201 ! restore the Y register having done our callouts to C
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202 wr %l4, %y
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203
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204 ! We can reinstall the original CWP here; even if interrupt_end()
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205 ! performed a reschedule (ie. yield/resume pair) we will be in the
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206 ! same window. The window is preserved by reschedule precisely
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207 ! because it is impossible atomically to disable traps here without
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208 ! involving a CWP living in a register for a time when other
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209 ! interrupts may occur.
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210
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211 ! disable traps (using the saved psr is fastest way)
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212 wr %l0, %psr ! restores flags, disables traps, same PIL.
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213 #ifdef DELAYS_AFTER_WRPSR_SAME_WINDOW
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214 nop
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215 nop
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216 nop
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217 #endif
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218 ! HELP_GDB_WITH_BACKTRACE
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219 mov %l5, %i7 ! restore (unused) return link
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220
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221 ! and restore other saved regs
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222 add %sp, 24 * 4, %sp ! undo fresh frame
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223 ! restore a maximal context regardless: see also
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224 ! CYGDBG_HAL_COMMON_INTERRUPTS_SAVE_MINIMUM_CONTEXT
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225 ldd [%sp + 0 * 4], %l0 ! restore L & I registers
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226 ldd [%sp + 2 * 4], %l2 ! to support the handler
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227 ldd [%sp + 4 * 4], %l4 ! having messed with them.
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228 ldd [%sp + 6 * 4], %l6
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229
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230 ldd [%sp + 8 * 4], %i0
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231 ldd [%sp + 10 * 4], %i2
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232 ldd [%sp + 12 * 4], %i4
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233 ldd [%sp + 14 * 4], %i6
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234
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235 ld [%sp + 17 * 4], %g1 ! and G registers
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236 ldd [%sp + 18 * 4], %g2
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237 ldd [%sp + 20 * 4], %g4
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238 ldd [%sp + 22 * 4], %g6
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239 ! no point whatsoever in loading back O registers.
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240
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241 ! Now test for window underflow here and fix up if needs be.
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242 !
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243 ! Why? interrupt_end() might have yielded us, when only
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244 ! its own frame was restored; its own return to us caused a
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245 ! window underflow trap, as would our return to interruptee
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246 ! unless we deal with it now.
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247
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248 add %l0, 1, %l7 ! interruptee~s CWP plus noise
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249 and %l7, __WINBITS, %l7 ! CWP only
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250 #if 8 == __WINSIZE
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251 ! it is in range already
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252 #else // expect 5 or 6 or 7 windows
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253 cmp %l7, __WINSIZE
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254 bge,a 567f ! taken: do delay slot, handle overflow
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255 mov 0, %l7 ! only if .ge. above
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256 567:
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257 #endif
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258 mov 1, %l6
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259 sll %l6, %l7, %l6 ! 1 << CWP
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260 rd %wim, %l5
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261 cmp %l5, %l6 ! are they the same?
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262 bne 2f ! No, so the stack is OK as is.
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263
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264 ! now do by hand an underflow trap, effectively
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265 sll %l5, 1, %l5 ! Rotate wim left
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266 srl %l6, __WINSIZE-1, %l6
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267 wr %l5, %l6, %wim
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268 #ifdef DELAYS_AFTER_WRWIM
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269 nop ! are these delays needed?
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270 nop ! (following restore uses wim)
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271 nop
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272 #endif
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273 restore ! Interruptee~s window
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274 ldd [%sp + 0 * 4], %l0 ! restore L & I registers
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275 ldd [%sp + 2 * 4], %l2
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276 ldd [%sp + 4 * 4], %l4
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277 ldd [%sp + 6 * 4], %l6
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278
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279 ldd [%sp + 8 * 4], %i0
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280 ldd [%sp + 10 * 4], %i2
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281 ldd [%sp + 12 * 4], %i4
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282 ldd [%sp + 14 * 4], %i6
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283 save ! Back to trap window
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284
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285 2: ! restore the condition codes, PSR and PIL and return from trap.
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286 wr %l0, %psr ! restores flags, disables traps, and old PIL
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287 #ifdef DELAYS_AFTER_WRPSR_SAME_WINDOW
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288 nop
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289 nop
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290 nop
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291 #endif
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292 jmpl %l1, %g0
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293 rett %l2
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294
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295
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296 ! end of vec_xvsr.S