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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [gcc/] [config/] [s390/] [linux-unwind.h] - Blame information for rev 816

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1 38 julius
/* DWARF2 EH unwinding support for S/390 Linux.
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   Copyright (C) 2004, 2005, 2006 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 it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file with other programs, and to distribute
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those programs without any restriction coming from the use of this
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file.  (The General Public License restrictions do apply in other
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respects; for example, they cover modification of the file, and
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distribution when not linked into another program.)
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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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 COPYING.  If not, write to the Free
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Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA.  */
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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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#define MD_FALLBACK_FRAME_STATE_FOR s390_fallback_frame_state
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static _Unwind_Reason_Code
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s390_fallback_frame_state (struct _Unwind_Context *context,
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                           _Unwind_FrameState *fs)
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{
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  unsigned char *pc = context->ra;
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  long new_cfa;
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  int i;
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  typedef struct
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  {
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    unsigned long psw_mask;
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    unsigned long psw_addr;
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    unsigned long gprs[16];
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    unsigned int  acrs[16];
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    unsigned int  fpc;
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    unsigned int  __pad;
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    double        fprs[16];
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  } __attribute__ ((__aligned__ (8))) sigregs_;
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  sigregs_ *regs;
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  int *signo;
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  /* svc $__NR_sigreturn or svc $__NR_rt_sigreturn  */
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  if (pc[0] != 0x0a || (pc[1] != 119 && pc[1] != 173))
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    return _URC_END_OF_STACK;
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  /* Legacy frames:
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       old signal mask (8 bytes)
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       pointer to sigregs (8 bytes) - points always to next location
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       sigregs
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       retcode
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     This frame layout was used on kernels < 2.6.9 for non-RT frames,
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     and on kernels < 2.4.13 for RT frames as well.  Note that we need
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     to look at RA to detect this layout -- this means that if you use
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     sa_restorer to install a different signal restorer on a legacy
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     kernel, unwinding from signal frames will not work.  */
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  if (context->ra == context->cfa + 16 + sizeof (sigregs_))
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    {
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      regs = (sigregs_ *)(context->cfa + 16);
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      signo = NULL;
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    }
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  /* New-style RT frame:
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     retcode + alignment (8 bytes)
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     siginfo (128 bytes)
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     ucontext (contains sigregs)  */
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  else if (pc[1] == 173 /* __NR_rt_sigreturn */)
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    {
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      struct ucontext_
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      {
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        unsigned long     uc_flags;
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        struct ucontext_ *uc_link;
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        unsigned long     uc_stack[3];
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        sigregs_          uc_mcontext;
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      } *uc = context->cfa + 8 + 128;
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      regs = &uc->uc_mcontext;
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      signo = context->cfa + sizeof(long);
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    }
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  /* New-style non-RT frame:
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     old signal mask (8 bytes)
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     pointer to sigregs (followed by signal number)  */
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  else
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    {
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      regs = *(sigregs_ **)(context->cfa + 8);
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      signo = (int *)(regs + 1);
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    }
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  new_cfa = regs->gprs[15] + 16*sizeof(long) + 32;
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  fs->cfa_how = CFA_REG_OFFSET;
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  fs->cfa_reg = 15;
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  fs->cfa_offset =
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    new_cfa - (long) context->cfa + 16*sizeof(long) + 32;
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  for (i = 0; i < 16; 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)&regs->gprs[i] - new_cfa;
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    }
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  for (i = 0; i < 16; i++)
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    {
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      fs->regs.reg[16+i].how = REG_SAVED_OFFSET;
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      fs->regs.reg[16+i].loc.offset =
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        (long)&regs->fprs[i] - new_cfa;
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    }
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  /* Load return addr from PSW into dummy register 32.  */
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  fs->regs.reg[32].how = REG_SAVED_OFFSET;
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  fs->regs.reg[32].loc.offset = (long)&regs->psw_addr - new_cfa;
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  fs->retaddr_column = 32;
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  /* SIGILL, SIGFPE and SIGTRAP are delivered with psw_addr
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     after the faulting instruction rather than before it.
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     Don't set FS->signal_frame in that case.  */
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  if (!signo || (*signo != 4 && *signo != 5 && *signo != 8))
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    fs->signal_frame = 1;
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  return _URC_NO_REASON;
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}

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