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julius |
/* DWARF2 EH unwinding support for Alpha VMS.
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Copyright (C) 2004, 2007 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include <pdscdef.h>
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#define MD_FALLBACK_FRAME_STATE_FOR alpha_fallback_frame_state
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static _Unwind_Reason_Code
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alpha_fallback_frame_state (struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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PDSCDEF *pv = *((PDSCDEF **) context->reg [29]);
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if (pv && ((long) pv & 0x7) == 0) /* low bits 0 means address */
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pv = *(PDSCDEF **) pv;
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if (pv && ((pv->pdsc$w_flags & 0xf) == PDSC$K_KIND_FP_STACK))
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{
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int i, j;
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fs->cfa_offset = pv->pdsc$l_size;
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fs->cfa_reg = pv->pdsc$w_flags & PDSC$M_BASE_REG_IS_FP ? 29 : 30;
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fs->retaddr_column = 26;
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fs->cfa_how = CFA_REG_OFFSET;
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fs->regs.reg[27].loc.offset = -pv->pdsc$l_size;
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fs->regs.reg[27].how = REG_SAVED_OFFSET;
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fs->regs.reg[26].loc.offset
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= -(pv->pdsc$l_size - pv->pdsc$w_rsa_offset);
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fs->regs.reg[26].how = REG_SAVED_OFFSET;
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for (i = 0, j = 0; i < 32; i++)
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if (1<<i & pv->pdsc$l_ireg_mask)
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{
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fs->regs.reg[i].loc.offset
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= -(pv->pdsc$l_size - pv->pdsc$w_rsa_offset - 8 * ++j);
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fs->regs.reg[i].how = REG_SAVED_OFFSET;
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}
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return _URC_NO_REASON;
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}
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else if (pv && ((pv->pdsc$w_flags & 0xf) == PDSC$K_KIND_FP_REGISTER))
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{
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fs->cfa_offset = pv->pdsc$l_size;
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fs->cfa_reg = pv->pdsc$w_flags & PDSC$M_BASE_REG_IS_FP ? 29 : 30;
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fs->retaddr_column = 26;
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fs->cfa_how = CFA_REG_OFFSET;
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fs->regs.reg[26].loc.reg = pv->pdsc$b_save_ra;
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fs->regs.reg[26].how = REG_SAVED_REG;
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fs->regs.reg[29].loc.reg = pv->pdsc$b_save_fp;
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fs->regs.reg[29].how = REG_SAVED_REG;
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return _URC_NO_REASON;
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}
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return _URC_END_OF_STACK;
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}
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