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1 // picoChip ASM file
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2 //
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3 // Support for 32-bit signed division/modulus.
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4 //
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5 // Copyright (C) 2003, 2004, 2005, 2008, 2009 Free Software Foundation, Inc.
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6 // Contributed by picoChip Designs Ltd.
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7 // Maintained by Daniel Towner (daniel.towner@picochip.com)
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8 //
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9 // This file is free software; you can redistribute it and/or modify it
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10 // under the terms of the GNU General Public License as published by the
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11 // Free Software Foundation; either version 3, or (at your option) any
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12 // later version.
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13 //
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14 // This file is distributed in the hope that it will be useful, but
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15 // WITHOUT ANY WARRANTY; without even the implied warranty of
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16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 // General Public License for more details.
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18 //
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19 // Under Section 7 of GPL version 3, you are granted additional
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20 // permissions described in the GCC Runtime Library Exception, version
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21 // 3.1, as published by the Free Software Foundation.
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22 //
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23 // You should have received a copy of the GNU General Public License and
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24 // a copy of the GCC Runtime Library Exception along with this program;
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25 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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26 // <http://www.gnu.org/licenses/>.
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27
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28 .section .text
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29
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30 .align 8
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31 .global __divmodsi4
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32 __divmodsi4:
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33 _picoMark_FUNCTION_BEGIN=
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34 // picoChip Function Prologue : &__divmodsi4 = 8 bytes
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35
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36 // Note: optimising for size is preferred over optimising for speed.
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37
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38 // Note: the frame is setup throughout the following instructions,
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39 // and is complete at the point the udivmodsi4 function is called.
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40
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41 // Note that R9 is encoded with a pattern which indicates
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42 // whether the remainder and quotient should be negated on
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43 // completion. The MSB is set to the sign of the dividend
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44 // (i.e., the sign of the remainder), while the LSB encodes
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45 // the XOR of the two input's signs (i.e., the sign of the
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46 // quotient.
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47
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48 // If dividend is negative, invert the dividend and flag.
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49 ASR.0 r1,15,r4
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50 BEQ dividendNotNegative
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51 =-> STL R[9:8],(FP)-2
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52
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53 // Dividend is negative - negate dividend.
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54 SUB.0 0,R0,R0
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55 SUBB.0 0,R1,R1
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56
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57 dividendNotNegative:
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58
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59 // If divisor is negative, invert the divisor.
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60 AND.0 [lsr r3,15],1,r5
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61 SUB.0 R3,0, r15
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62 BGE divisorNotNegative
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63 =-> XOR.0 r4,r5,r9
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64
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65 // Divisor is negative - negate divisor.
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66 SUB.0 0,R2,R2
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67 SUBB.0 0,R3,R3
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68
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69 divisorNotNegative:
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70
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71 STL R[13:12],(FP)-1 \ JL (&__udivmodsi4)
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72 =-> SUB.0 FP,8,FP // udivmodsi expects the frame to be valid still.
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73
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74 // The LSB of R9 indicates whether the quotient should be negated.
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75 AND.0 r9,1,r15
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76 BEQ skipQuotientNegation
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77 =-> LDL (FP)1,R[13:12] // Convenient point to restore link/fp
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78
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79 SUB.0 0,R4,R4
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80 SUBB.0 0,R5,R5
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81
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82 skipQuotientNegation:
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83
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84 // The MSB of R9 indicates whether the remainder should be negated.
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85 ASR.0 R9,15,r15
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86 BEQ epilogue
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87
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88 SUB.0 0,R6,R6
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89 SUBB.0 0,R7,R7
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90
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91 epilogue:
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92
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93 JR (R12)
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94 =-> LDL (FP)-2,R[9:8]
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95
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96 _picoMark_FUNCTION_END=
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97 // picoChip Function Epilogue : __divmodsi4
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98
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99 //============================================================================
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100 // All DWARF information between this marker, and the END OF DWARF
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101 // marker should be included in the source file. Search for
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102 // FUNCTION_STACK_SIZE_GOES_HERE and FUNCTION NAME GOES HERE, and
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103 // provide the relevent information. Add markers called
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104 // _picoMark_FUNCTION_BEGIN and _picoMark_FUNCTION_END around the
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105 // function in question.
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106 //============================================================================
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107
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108 //============================================================================
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109 // Frame information.
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110 //============================================================================
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111
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112 .section .debug_frame
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113 _picoMark_DebugFrame=
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114
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115 // Common CIE header.
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116 .unalignedInitLong _picoMark_CieEnd-_picoMark_CieBegin
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117 _picoMark_CieBegin=
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118 .unalignedInitLong 0xffffffff
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119 .initByte 0x1 // CIE Version
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120 .ascii 16#0# // CIE Augmentation
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121 .uleb128 0x1 // CIE Code Alignment Factor
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122 .sleb128 2 // CIE Data Alignment Factor
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123 .initByte 0xc // CIE RA Column
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124 .initByte 0xc // DW_CFA_def_cfa
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125 .uleb128 0xd
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126 .uleb128 0x0
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127 .align 2
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128 _picoMark_CieEnd=
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129
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130 // FDE
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131 _picoMark_LSFDE0I900821033007563=
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132 .unalignedInitLong _picoMark_FdeEnd-_picoMark_FdeBegin
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133 _picoMark_FdeBegin=
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134 .unalignedInitLong _picoMark_DebugFrame // FDE CIE offset
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135 .unalignedInitWord _picoMark_FUNCTION_BEGIN // FDE initial location
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136 .unalignedInitWord _picoMark_FUNCTION_END-_picoMark_FUNCTION_BEGIN
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137 .initByte 0xe // DW_CFA_def_cfa_offset
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138 .uleb128 0x8 // <-- FUNCTION_STACK_SIZE_GOES_HERE
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139 .initByte 0x4 // DW_CFA_advance_loc4
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140 .unalignedInitLong _picoMark_FUNCTION_END-_picoMark_FUNCTION_BEGIN
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141 .initByte 0xe // DW_CFA_def_cfa_offset
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142 .uleb128 0x0
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143 .align 2
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144 _picoMark_FdeEnd=
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145
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146 //============================================================================
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147 // Abbrevation information.
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148 //============================================================================
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149
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150 .section .debug_abbrev
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151 _picoMark_ABBREVIATIONS=
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152
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153 .section .debug_abbrev
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154 .uleb128 0x1 // (abbrev code)
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155 .uleb128 0x11 // (TAG: DW_TAG_compile_unit)
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156 .initByte 0x1 // DW_children_yes
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157 .uleb128 0x10 // (DW_AT_stmt_list)
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158 .uleb128 0x6 // (DW_FORM_data4)
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159 .uleb128 0x12 // (DW_AT_high_pc)
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160 .uleb128 0x1 // (DW_FORM_addr)
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161 .uleb128 0x11 // (DW_AT_low_pc)
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162 .uleb128 0x1 // (DW_FORM_addr)
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163 .uleb128 0x25 // (DW_AT_producer)
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164 .uleb128 0x8 // (DW_FORM_string)
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165 .uleb128 0x13 // (DW_AT_language)
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166 .uleb128 0x5 // (DW_FORM_data2)
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167 .uleb128 0x3 // (DW_AT_name)
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168 .uleb128 0x8 // (DW_FORM_string)
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169 .initByte 0x0
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170 .initByte 0x0
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171
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172 .uleb128 0x2 ;# (abbrev code)
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173 .uleb128 0x2e ;# (TAG: DW_TAG_subprogram)
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174 .initByte 0x0 ;# DW_children_no
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175 .uleb128 0x3 ;# (DW_AT_name)
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176 .uleb128 0x8 ;# (DW_FORM_string)
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177 .uleb128 0x11 ;# (DW_AT_low_pc)
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178 .uleb128 0x1 ;# (DW_FORM_addr)
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179 .uleb128 0x12 ;# (DW_AT_high_pc)
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180 .uleb128 0x1 ;# (DW_FORM_addr)
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181 .initByte 0x0
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182 .initByte 0x0
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183
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184 .initByte 0x0
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185
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186 //============================================================================
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187 // Line information. DwarfLib requires this to be present, but it can
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188 // be empty.
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189 //============================================================================
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190
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191 .section .debug_line
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192 _picoMark_LINES=
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193
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194 //============================================================================
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195 // Debug Information
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196 //============================================================================
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197 .section .debug_info
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198
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199 //Fixed header.
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200 .unalignedInitLong _picoMark_DEBUG_INFO_END-_picoMark_DEBUG_INFO_BEGIN
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201 _picoMark_DEBUG_INFO_BEGIN=
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202 .unalignedInitWord 0x2
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203 .unalignedInitLong _picoMark_ABBREVIATIONS
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204 .initByte 0x2
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205
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206 // Compile unit information.
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207 .uleb128 0x1 // (DIE 0xb) DW_TAG_compile_unit)
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208 .unalignedInitLong _picoMark_LINES
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209 .unalignedInitWord _picoMark_FUNCTION_END
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210 .unalignedInitWord _picoMark_FUNCTION_BEGIN
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211 // Producer is `picoChip'
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212 .ascii 16#70# 16#69# 16#63# 16#6f# 16#43# 16#68# 16#69# 16#70# 16#00#
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213 .unalignedInitWord 0xcafe // ASM language
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214 .ascii 16#0# // Name. DwarfLib expects this to be present.
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215
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216 .uleb128 0x2 ;# (DIE DW_TAG_subprogram)
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217
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218 // FUNCTION NAME GOES HERE. Use `echo name | od -t x1' to get the hex. Each hex
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219 // digit is specified using the format 16#XX#
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220 .ascii 16#5f# 16#64# 16#69# 16#76# 16#6d# 16#6f# 16#64# 16#73# 16#69# 16#34# 16#0# // Function name `_divmodsi4'
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221 .unalignedInitWord _picoMark_FUNCTION_BEGIN // DW_AT_low_pc
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222 .unalignedInitWord _picoMark_FUNCTION_END // DW_AT_high_pc
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223
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224 .initByte 0x0 // end of compile unit children.
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225
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226 _picoMark_DEBUG_INFO_END=
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227
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228 //============================================================================
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229 // END OF DWARF
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230 //============================================================================
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231
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232 .section .endFile
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233 // End of picoChip ASM file
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