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111
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1 /* DWARF2 EH unwinding support for Blackfin.
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145
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2 Copyright (C) 2007-2020 Free Software Foundation, Inc.
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111
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 GCC is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 /* Do code reading to identify a signal frame, and set the frame
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26 state data appropriately. See unwind-dw2.c for the structs.
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27 Don't use this at all if inhibit_libc is used. */
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28
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29 #ifndef inhibit_libc
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30
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31 #include <signal.h>
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32 #include <sys/ucontext.h>
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33
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34 #define MD_FALLBACK_FRAME_STATE_FOR bfin_fallback_frame_state
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35
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36 static _Unwind_Reason_Code
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37 bfin_fallback_frame_state (struct _Unwind_Context *context,
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38 _Unwind_FrameState *fs)
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39 {
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40 unsigned char *pc = context->ra;
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41 struct sigcontext *sc;
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42 long new_cfa;
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43
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44 /* P0=__NR_rt_sigreturn (X); EXCPT 0x0; */
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45 if (*(unsigned short *)pc == 0xe128
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46 && *(unsigned short *)(pc + 2) == 0x00ad
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47 && *(unsigned short *)(pc + 4) == 0x00a0)
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48 {
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49 struct rt_sigframe {
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50 int sig;
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51 siginfo_t *pinfo;
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52 void *puc;
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53 char retcode[8];
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54 siginfo_t info;
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55 ucontext_t uc;
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56 } *rt_ = context->cfa;
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57
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58 /* The void * cast is necessary to avoid an aliasing warning.
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59 The aliasing warning is correct, but should not be a problem
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60 because it does not alias anything. */
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61 sc = (struct sigcontext *)(void *)&rt_->uc.uc_mcontext.gregs;
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62 }
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63 else
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64 return _URC_END_OF_STACK;
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65
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66 new_cfa = sc->sc_usp;
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67 fs->regs.cfa_how = CFA_REG_OFFSET;
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68 fs->regs.cfa_reg = 14;
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69 fs->regs.cfa_offset = new_cfa - (long) context->cfa;
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70
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71 fs->regs.reg[0].how = REG_SAVED_OFFSET;
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72 fs->regs.reg[0].loc.offset = (long)&sc->sc_r0 - new_cfa;
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73 fs->regs.reg[1].how = REG_SAVED_OFFSET;
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74 fs->regs.reg[1].loc.offset = (long)&sc->sc_r1 - new_cfa;
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75 fs->regs.reg[2].how = REG_SAVED_OFFSET;
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76 fs->regs.reg[2].loc.offset = (long)&sc->sc_r2 - new_cfa;
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77 fs->regs.reg[3].how = REG_SAVED_OFFSET;
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78 fs->regs.reg[3].loc.offset = (long)&sc->sc_r3 - new_cfa;
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79 fs->regs.reg[4].how = REG_SAVED_OFFSET;
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80 fs->regs.reg[4].loc.offset = (long)&sc->sc_r4 - new_cfa;
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81 fs->regs.reg[5].how = REG_SAVED_OFFSET;
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82 fs->regs.reg[5].loc.offset = (long)&sc->sc_r5 - new_cfa;
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83 fs->regs.reg[6].how = REG_SAVED_OFFSET;
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84 fs->regs.reg[6].loc.offset = (long)&sc->sc_r6 - new_cfa;
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85 fs->regs.reg[7].how = REG_SAVED_OFFSET;
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86 fs->regs.reg[7].loc.offset = (long)&sc->sc_r7 - new_cfa;
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87 fs->regs.reg[8].how = REG_SAVED_OFFSET;
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88 fs->regs.reg[8].loc.offset = (long)&sc->sc_p0 - new_cfa;
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89 fs->regs.reg[9].how = REG_SAVED_OFFSET;
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90 fs->regs.reg[9].loc.offset = (long)&sc->sc_p1 - new_cfa;
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91 fs->regs.reg[10].how = REG_SAVED_OFFSET;
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92 fs->regs.reg[10].loc.offset = (long)&sc->sc_p2 - new_cfa;
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93 fs->regs.reg[11].how = REG_SAVED_OFFSET;
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94 fs->regs.reg[11].loc.offset = (long)&sc->sc_p3 - new_cfa;
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95 fs->regs.reg[12].how = REG_SAVED_OFFSET;
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96 fs->regs.reg[12].loc.offset = (long)&sc->sc_p4 - new_cfa;
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97 fs->regs.reg[13].how = REG_SAVED_OFFSET;
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98 fs->regs.reg[13].loc.offset = (long)&sc->sc_p5 - new_cfa;
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99
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100 fs->regs.reg[15].how = REG_SAVED_OFFSET;
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101 fs->regs.reg[15].loc.offset = (long)&sc->sc_fp - new_cfa;
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102 fs->regs.reg[16].how = REG_SAVED_OFFSET;
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103 fs->regs.reg[16].loc.offset = (long)&sc->sc_i0 - new_cfa;
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104 fs->regs.reg[17].how = REG_SAVED_OFFSET;
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105 fs->regs.reg[17].loc.offset = (long)&sc->sc_i1 - new_cfa;
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106 fs->regs.reg[18].how = REG_SAVED_OFFSET;
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107 fs->regs.reg[18].loc.offset = (long)&sc->sc_i2 - new_cfa;
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108 fs->regs.reg[19].how = REG_SAVED_OFFSET;
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109 fs->regs.reg[19].loc.offset = (long)&sc->sc_i3 - new_cfa;
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110 fs->regs.reg[20].how = REG_SAVED_OFFSET;
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111 fs->regs.reg[20].loc.offset = (long)&sc->sc_b0 - new_cfa;
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112 fs->regs.reg[21].how = REG_SAVED_OFFSET;
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113 fs->regs.reg[21].loc.offset = (long)&sc->sc_b1 - new_cfa;
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114 fs->regs.reg[22].how = REG_SAVED_OFFSET;
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115 fs->regs.reg[22].loc.offset = (long)&sc->sc_b2 - new_cfa;
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116 fs->regs.reg[23].how = REG_SAVED_OFFSET;
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117 fs->regs.reg[23].loc.offset = (long)&sc->sc_b3 - new_cfa;
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118 fs->regs.reg[24].how = REG_SAVED_OFFSET;
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119 fs->regs.reg[24].loc.offset = (long)&sc->sc_l0 - new_cfa;
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120 fs->regs.reg[25].how = REG_SAVED_OFFSET;
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121 fs->regs.reg[25].loc.offset = (long)&sc->sc_l1 - new_cfa;
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122 fs->regs.reg[26].how = REG_SAVED_OFFSET;
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123 fs->regs.reg[26].loc.offset = (long)&sc->sc_l2 - new_cfa;
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124 fs->regs.reg[27].how = REG_SAVED_OFFSET;
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125 fs->regs.reg[27].loc.offset = (long)&sc->sc_l3 - new_cfa;
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126 fs->regs.reg[28].how = REG_SAVED_OFFSET;
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127 fs->regs.reg[28].loc.offset = (long)&sc->sc_m0 - new_cfa;
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128 fs->regs.reg[29].how = REG_SAVED_OFFSET;
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129 fs->regs.reg[29].loc.offset = (long)&sc->sc_m1 - new_cfa;
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130 fs->regs.reg[30].how = REG_SAVED_OFFSET;
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131 fs->regs.reg[30].loc.offset = (long)&sc->sc_m2 - new_cfa;
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132 fs->regs.reg[31].how = REG_SAVED_OFFSET;
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133 fs->regs.reg[31].loc.offset = (long)&sc->sc_m3 - new_cfa;
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134 /* FIXME: Handle A0, A1, CC. */
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135 fs->regs.reg[35].how = REG_SAVED_OFFSET;
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136 fs->regs.reg[35].loc.offset = (long)&sc->sc_rets - new_cfa;
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137 fs->regs.reg[36].how = REG_SAVED_OFFSET;
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138 fs->regs.reg[36].loc.offset = (long)&sc->sc_pc - new_cfa;
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139 fs->regs.reg[37].how = REG_SAVED_OFFSET;
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140 fs->regs.reg[37].loc.offset = (long)&sc->sc_retx - new_cfa;
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141
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142 fs->regs.reg[40].how = REG_SAVED_OFFSET;
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143 fs->regs.reg[40].loc.offset = (long)&sc->sc_astat - new_cfa;
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144 fs->regs.reg[41].how = REG_SAVED_OFFSET;
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145 fs->regs.reg[41].loc.offset = (long)&sc->sc_seqstat - new_cfa;
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146
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147 fs->regs.reg[44].how = REG_SAVED_OFFSET;
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148 fs->regs.reg[44].loc.offset = (long)&sc->sc_lt0 - new_cfa;
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149 fs->regs.reg[45].how = REG_SAVED_OFFSET;
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150 fs->regs.reg[45].loc.offset = (long)&sc->sc_lt1 - new_cfa;
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151 fs->regs.reg[46].how = REG_SAVED_OFFSET;
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152 fs->regs.reg[46].loc.offset = (long)&sc->sc_lc0 - new_cfa;
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153 fs->regs.reg[47].how = REG_SAVED_OFFSET;
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154 fs->regs.reg[47].loc.offset = (long)&sc->sc_lc1 - new_cfa;
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155 fs->regs.reg[48].how = REG_SAVED_OFFSET;
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156 fs->regs.reg[48].loc.offset = (long)&sc->sc_lb0 - new_cfa;
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157 fs->regs.reg[49].how = REG_SAVED_OFFSET;
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158 fs->regs.reg[49].loc.offset = (long)&sc->sc_lb1 - new_cfa;
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159 fs->retaddr_column = 35;
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160
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161 return _URC_NO_REASON;
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162 }
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163
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164 #endif /* ifdef inhibit_libc */
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