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1 /* DWARF2 EH unwinding support for Alpha Linux.
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2 Copyright (C) 2004, 2005, 2009 Free Software Foundation, Inc.
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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
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28 #include <signal.h>
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29 #include <sys/ucontext.h>
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30
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31 #define MD_FALLBACK_FRAME_STATE_FOR alpha_fallback_frame_state
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32
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33 static _Unwind_Reason_Code
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34 alpha_fallback_frame_state (struct _Unwind_Context *context,
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35 _Unwind_FrameState *fs)
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36 {
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37 unsigned int *pc = context->ra;
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38 struct sigcontext *sc;
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39 long new_cfa, i;
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40
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41 if (pc[0] != 0x47fe0410 /* mov $30,$16 */
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42 || pc[2] != 0x00000083 /* callsys */)
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43 return _URC_END_OF_STACK;
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44 if (context->cfa == 0)
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45 return _URC_END_OF_STACK;
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46 if (pc[1] == 0x201f0067) /* lda $0,NR_sigreturn */
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47 sc = context->cfa;
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48 else if (pc[1] == 0x201f015f) /* lda $0,NR_rt_sigreturn */
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49 {
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50 struct rt_sigframe {
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51 struct siginfo info;
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52 struct ucontext uc;
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53 } *rt_ = context->cfa;
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54 sc = &rt_->uc.uc_mcontext;
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55 }
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56 else
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57 return _URC_END_OF_STACK;
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58 new_cfa = sc->sc_regs[30];
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59 fs->regs.cfa_how = CFA_REG_OFFSET;
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60 fs->regs.cfa_reg = 30;
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61 fs->regs.cfa_offset = new_cfa - (long) context->cfa;
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62 for (i = 0; i < 30; ++i)
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63 {
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64 fs->regs.reg[i].how = REG_SAVED_OFFSET;
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65 fs->regs.reg[i].loc.offset
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66 = (long)&sc->sc_regs[i] - new_cfa;
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67 }
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68 for (i = 0; i < 31; ++i)
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69 {
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70 fs->regs.reg[i+32].how = REG_SAVED_OFFSET;
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71 fs->regs.reg[i+32].loc.offset
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72 = (long)&sc->sc_fpregs[i] - new_cfa;
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73 }
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74 fs->regs.reg[64].how = REG_SAVED_OFFSET;
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75 fs->regs.reg[64].loc.offset = (long)&sc->sc_pc - new_cfa;
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76 fs->retaddr_column = 64;
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77 return _URC_NO_REASON;
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78 }
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