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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgcc/] [config/] [alpha/] [linux-unwind.h] - Blame information for rev 734

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1 734 jeremybenn
/* DWARF2 EH unwinding support for Alpha Linux.
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   Copyright (C) 2004, 2005, 2009, 2011 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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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
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<http://www.gnu.org/licenses/>.  */
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/* Do code reading to identify a signal frame, and set the frame
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   state data appropriately.  See unwind-dw2.c for the structs.  */
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#include <signal.h>
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#include <sys/ucontext.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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  unsigned int *pc = context->ra;
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  struct sigcontext *sc;
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  long new_cfa;
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  int i;
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  if (pc[0] != 0x47fe0410                /* mov $30,$16 */
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      || pc[2] != 0x00000083)           /* callsys */
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    return _URC_END_OF_STACK;
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  if (context->cfa == 0)
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    return _URC_END_OF_STACK;
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  if (pc[1] == 0x201f0067)              /* lda $0,NR_sigreturn */
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    sc = context->cfa;
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  else if (pc[1] == 0x201f015f)         /* lda $0,NR_rt_sigreturn */
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    {
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      struct rt_sigframe {
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        struct siginfo info;
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        struct ucontext uc;
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      } *rt_ = context->cfa;
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      sc = &rt_->uc.uc_mcontext;
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    }
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  else
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    return _URC_END_OF_STACK;
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  new_cfa = sc->sc_regs[30];
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  fs->regs.cfa_how = CFA_REG_OFFSET;
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  fs->regs.cfa_reg = 30;
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  fs->regs.cfa_offset = new_cfa - (long) context->cfa;
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  for (i = 0; i < 30; ++i)
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    {
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      fs->regs.reg[i].how = REG_SAVED_OFFSET;
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      fs->regs.reg[i].loc.offset
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        = (long) &sc->sc_regs[i] - new_cfa;
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    }
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  for (i = 0; i < 31; ++i)
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    {
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      fs->regs.reg[i+32].how = REG_SAVED_OFFSET;
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      fs->regs.reg[i+32].loc.offset
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        = (long) &sc->sc_fpregs[i] - new_cfa;
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    }
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  fs->regs.reg[64].how = REG_SAVED_OFFSET;
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  fs->regs.reg[64].loc.offset = (long)&sc->sc_pc - new_cfa;
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  fs->retaddr_column = 64;
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  fs->signal_frame = 1;
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  return _URC_NO_REASON;
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}
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#define MD_FROB_UPDATE_CONTEXT alpha_frob_update_context
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/* Fix up for signal handlers that don't have S flag set.  */
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static void
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alpha_frob_update_context (struct _Unwind_Context *context,
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                           _Unwind_FrameState *fs ATTRIBUTE_UNUSED)
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{
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  unsigned int *pc = context->ra;
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  if (pc[0] == 0x47fe0410                /* mov $30,$16 */
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      && pc[2] == 0x00000083            /* callsys */
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      && (pc[1] == 0x201f0067           /* lda $0,NR_sigreturn */
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          || pc[1] == 0x201f015f))      /* lda $0,NR_rt_sigreturn */
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    _Unwind_SetSignalFrame (context, 1);
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}

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