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