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1 /* DWARF2 EH unwinding support for Alpha VMS.
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2 Copyright (C) 2004, 2007 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 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include <pdscdef.h>
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21
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22 #define MD_FALLBACK_FRAME_STATE_FOR alpha_fallback_frame_state
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23
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24 static _Unwind_Reason_Code
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25 alpha_fallback_frame_state (struct _Unwind_Context *context,
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26 _Unwind_FrameState *fs)
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27 {
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28 PDSCDEF *pv = *((PDSCDEF **) context->reg [29]);
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29
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30 if (pv && ((long) pv & 0x7) == 0) /* low bits 0 means address */
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31 pv = *(PDSCDEF **) pv;
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32
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33 if (pv && ((pv->pdsc$w_flags & 0xf) == PDSC$K_KIND_FP_STACK))
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34 {
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35 int i, j;
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36
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37 fs->regs.cfa_offset = pv->pdsc$l_size;
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38 fs->regs.cfa_reg = pv->pdsc$w_flags & PDSC$M_BASE_REG_IS_FP ? 29 : 30;
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39 fs->retaddr_column = 26;
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40 fs->regs.cfa_how = CFA_REG_OFFSET;
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41 fs->regs.reg[27].loc.offset = -pv->pdsc$l_size;
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42 fs->regs.reg[27].how = REG_SAVED_OFFSET;
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43 fs->regs.reg[26].loc.offset
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44 = -(pv->pdsc$l_size - pv->pdsc$w_rsa_offset);
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45 fs->regs.reg[26].how = REG_SAVED_OFFSET;
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46
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47 for (i = 0, j = 0; i < 32; i++)
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48 if (1<<i & pv->pdsc$l_ireg_mask)
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49 {
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50 fs->regs.reg[i].loc.offset
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51 = -(pv->pdsc$l_size - pv->pdsc$w_rsa_offset - 8 * ++j);
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52 fs->regs.reg[i].how = REG_SAVED_OFFSET;
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53 }
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54
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55 return _URC_NO_REASON;
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56 }
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57 else if (pv && ((pv->pdsc$w_flags & 0xf) == PDSC$K_KIND_FP_REGISTER))
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58 {
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59 fs->regs.cfa_offset = pv->pdsc$l_size;
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60 fs->regs.cfa_reg = pv->pdsc$w_flags & PDSC$M_BASE_REG_IS_FP ? 29 : 30;
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61 fs->retaddr_column = 26;
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62 fs->regs.cfa_how = CFA_REG_OFFSET;
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63 fs->regs.reg[26].loc.reg = pv->pdsc$b_save_ra;
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64 fs->regs.reg[26].how = REG_SAVED_REG;
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65 fs->regs.reg[29].loc.reg = pv->pdsc$b_save_fp;
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66 fs->regs.reg[29].how = REG_SAVED_REG;
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67
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68 return _URC_NO_REASON;
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69 }
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70 return _URC_END_OF_STACK;
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71 }
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