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annotate packages/hal/powerpc/arch/current/include/ppc.inc @ 16:4f2df4ab82c8 ecos-sw-1999-06-18

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Merge from eCos master repository on 1999-06-18-15:25:04-BST
author jlarmour
date Fri, 18 Jun 1999 07:59:09 +0000
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1 ##=============================================================================
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2 ##
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3 ## ppc.inc
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4 ##
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5 ## PowerPC assembler header file
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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 Cygnus eCos Public License
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12 # Version 1.0 (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://sourceware.cygnus.com/ecos
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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 Cygnus Operating System, released
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22 # September 30, 1998.
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23 #
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24 # The Initial Developer of the Original Code is Cygnus. Portions created
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25 # by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved.
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26 # -------------------------------------------
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27 #
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28 #####COPYRIGHTEND####
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29 ##=============================================================================
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30 #######DESCRIPTIONBEGIN####
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31 ##
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32 ## Author(s): nickg
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33 ## Contributors: nickg
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34 ## Date: 1997-10-16
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35 ## Purpose: PowerPC definitions.
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36 ## Description: This file contains various definitions and macros that are
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37 ## useful for writing assembly code for the PowerPC
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38 ## Usage:
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39 ## #include <cyg/hal/ppc.inc>
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40 ## ...
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41 ##
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42 ##
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43 ######DESCRIPTIONEND####
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44 ##
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45 ##=============================================================================
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46
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47 #------------------------------------------------------------------------------
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48 # Easier to read names for the registers
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49
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50 .equ r0, 0
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51 .equ r1, 1
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52 .equ r2, 2
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53 .equ r3, 3
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54 .equ r4, 4
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55 .equ r5, 5
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56 .equ r6, 6
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57 .equ r7, 7
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58 .equ r8, 8
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59 .equ r9, 9
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60 .equ r10, 10
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61 .equ r11, 11
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62 .equ r12, 12
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63 .equ r13, 13
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64 .equ r14, 14
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65 .equ r15, 15
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66 .equ r16, 16
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67 .equ r17, 17
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68 .equ r18, 18
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69 .equ r19, 19
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70 .equ r20, 20
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71 .equ r21, 21
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72 .equ r22, 22
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73 .equ r23, 23
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74 .equ r24, 24
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75 .equ r25, 25
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76 .equ r26, 26
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77 .equ r27, 27
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78 .equ r28, 28
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79 .equ r29, 29
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80 .equ r30, 30
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81 .equ r31, 31
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82
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83 .equ sp, r1
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84
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85 #------------------------------------------------------------------------------
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86 # Some useful coding macros
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87
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88 # Load immediate word, has to be done with 2 instructions
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89 .macro lwi reg,val
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90 lis \reg,\val@H
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91 ori \reg,\reg,\val@L
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92 .endm
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93
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94 #ifdef CYG_HAL_POWERPC_MPC603
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95 # Move from HID0 hw control register
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96 .macro mfhid0 reg
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97 mfspr \reg,HID0
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98 .endm
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99 #endif
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100
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101 #define FUNC_START(name) \
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102 .type name,@function; \
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103 .globl name; \
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104 name:
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105
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106 #define FUNC_END(name) \
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107 /* nothing for now */
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108
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109 #------------------------------------------------------------------------------
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110 # Exception, interrupt and thread context save area layout
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111 # The layout of this structure is also defined in "hal_arch.h", for C
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112 # code. Do not change this without changing that (or vice versa).
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113
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114 # These first 39 words are common to all saved states
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115 .equ ppcreg_regs, 0 # 32 integer registers
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116 .equ ppcreg_cr, 32*4
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117 .equ ppcreg_xer, 33*4
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118 .equ ppcreg_lr, 34*4
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119 .equ ppcreg_ctr, 35*4
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120 .equ ppcreg_msr, 36*4 # MSR at time of exception
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121 .equ ppcreg_pc, 37*4 # PC at time of exception
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122 .equ ppcreg_context_size, 38*4
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123
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124 # The following are only saved on exceptions and interrupts
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125 .equ ppcreg_vector, 38*4 # exception vector
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126
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127 # The following are only saved on exceptions, and are for information
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128 # only. They are not restored with the rest of the state.
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129 .equ ppcreg_hid0, 39*4 # HID0 HW control register
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130 .equ ppcreg_dar, 40*4 # data address register
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131 .equ ppcreg_dsisr, 41*4 # DSI status register
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132 .equ ppcreg_pvr, 42*4 # processor version
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133 .equ ppcreg_exception_size, 43*4
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134
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135 # Eventually add BATs, SRs and FP registers too.
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136
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137 .equ ppc_stack_frame_size, 56 # size of a stack frame
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138
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139 .equ ppc_exception_decrement, ppcreg_exception_size
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140
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141
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142 #------------------------------------------------------------------------------
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143 # end of ppc.inc