gcc/config/bfin/linux-unwind.h

   1 /* DWARF2 EH unwinding support for Blackfin.
   2    Copyright (C) 2007 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 In addition to the permissions in the GNU General Public License, the
  12 Free Software Foundation gives you unlimited permission to link the
  13 compiled version of this file with other programs, and to distribute
  14 those programs without any restriction coming from the use of this
  15 file.  (The General Public License restrictions do apply in other
  16 respects; for example, they cover modification of the file, and
  17 distribution when not linked into another program.)
  18
  19 GCC is distributed in the hope that it will be useful,
  20 but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 GNU General Public License for more details.
  23
  24 You should have received a copy of the GNU General Public License
  25 along with GCC; see the file COPYING.  If not, write to
  26 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  27 Boston, MA 02110-1301, USA.  */
  28
  29 /* Do code reading to identify a signal frame, and set the frame
  30    state data appropriately.  See unwind-dw2.c for the structs.
  31    Don't use this at all if inhibit_libc is used.  */
  32
  33 #ifndef inhibit_libc
  34
  35 #include <signal.h>
  36 #include <sys/ucontext.h>
  37
  38 #define MD_FALLBACK_FRAME_STATE_FOR bfin_fallback_frame_state
  39
  40 static _Unwind_Reason_Code
  41 bfin_fallback_frame_state (struct _Unwind_Context *context,
  42                            _Unwind_FrameState *fs)
  43 {
  44   unsigned char *pc = context->ra;
  45   struct sigcontext *sc;
  46   long new_cfa;
  47
  48   /* P0=__NR_rt_sigreturn (X); EXCPT  0x0; */
  49   if (*(unsigned short *)pc == 0xe128
  50       && *(unsigned short *)(pc + 2) == 0x00ad
  51       && *(unsigned short *)(pc + 4) == 0x00a0)
  52     {
  53       struct rt_sigframe {
  54         int sig;
  55         struct siginfo *pinfo;
  56         void *puc;
  57         char retcode[8];
  58         struct siginfo info;
  59         struct ucontext uc;
  60       } *rt_ = context->cfa;
  61
  62       /* The void * cast is necessary to avoid an aliasing warning.
  63          The aliasing warning is correct, but should not be a problem
  64          because it does not alias anything.  */
  65       sc = (struct sigcontext *)(void *)&rt_->uc.uc_mcontext.gregs;
  66     }
  67   else
  68     return _URC_END_OF_STACK;
  69
  70   new_cfa = sc->sc_usp;
  71   fs->regs.cfa_how = CFA_REG_OFFSET;
  72   fs->regs.cfa_reg = 14;
  73   fs->regs.cfa_offset = new_cfa - (long) context->cfa;
  74
  75   fs->regs.reg[0].how = REG_SAVED_OFFSET;
  76   fs->regs.reg[0].loc.offset = (long)&sc->sc_r0 - new_cfa;
  77   fs->regs.reg[1].how = REG_SAVED_OFFSET;
  78   fs->regs.reg[1].loc.offset = (long)&sc->sc_r1 - new_cfa;
  79   fs->regs.reg[2].how = REG_SAVED_OFFSET;
  80   fs->regs.reg[2].loc.offset = (long)&sc->sc_r2 - new_cfa;
  81   fs->regs.reg[3].how = REG_SAVED_OFFSET;
  82   fs->regs.reg[3].loc.offset = (long)&sc->sc_r3 - new_cfa;
  83   fs->regs.reg[4].how = REG_SAVED_OFFSET;
  84   fs->regs.reg[4].loc.offset = (long)&sc->sc_r4 - new_cfa;
  85   fs->regs.reg[5].how = REG_SAVED_OFFSET;
  86   fs->regs.reg[5].loc.offset = (long)&sc->sc_r5 - new_cfa;
  87   fs->regs.reg[6].how = REG_SAVED_OFFSET;
  88   fs->regs.reg[6].loc.offset = (long)&sc->sc_r6 - new_cfa;
  89   fs->regs.reg[7].how = REG_SAVED_OFFSET;
  90   fs->regs.reg[7].loc.offset = (long)&sc->sc_r7 - new_cfa;
  91   fs->regs.reg[8].how = REG_SAVED_OFFSET;
  92   fs->regs.reg[8].loc.offset = (long)&sc->sc_p0 - new_cfa;
  93   fs->regs.reg[9].how = REG_SAVED_OFFSET;
  94   fs->regs.reg[9].loc.offset = (long)&sc->sc_p1 - new_cfa;
  95   fs->regs.reg[10].how = REG_SAVED_OFFSET;
  96   fs->regs.reg[10].loc.offset = (long)&sc->sc_p2 - new_cfa;
  97   fs->regs.reg[11].how = REG_SAVED_OFFSET;
  98   fs->regs.reg[11].loc.offset = (long)&sc->sc_p3 - new_cfa;
  99   fs->regs.reg[12].how = REG_SAVED_OFFSET;
 100   fs->regs.reg[12].loc.offset = (long)&sc->sc_p4 - new_cfa;
 101   fs->regs.reg[13].how = REG_SAVED_OFFSET;
 102   fs->regs.reg[13].loc.offset = (long)&sc->sc_p5 - new_cfa;
 103
 104   fs->regs.reg[15].how = REG_SAVED_OFFSET;
 105   fs->regs.reg[15].loc.offset = (long)&sc->sc_fp - new_cfa;
 106   fs->regs.reg[16].how = REG_SAVED_OFFSET;
 107   fs->regs.reg[16].loc.offset = (long)&sc->sc_i0 - new_cfa;
 108   fs->regs.reg[17].how = REG_SAVED_OFFSET;
 109   fs->regs.reg[17].loc.offset = (long)&sc->sc_i1 - new_cfa;
 110   fs->regs.reg[18].how = REG_SAVED_OFFSET;
 111   fs->regs.reg[18].loc.offset = (long)&sc->sc_i2 - new_cfa;
 112   fs->regs.reg[19].how = REG_SAVED_OFFSET;
 113   fs->regs.reg[19].loc.offset = (long)&sc->sc_i3 - new_cfa;
 114   fs->regs.reg[20].how = REG_SAVED_OFFSET;
 115   fs->regs.reg[20].loc.offset = (long)&sc->sc_b0 - new_cfa;
 116   fs->regs.reg[21].how = REG_SAVED_OFFSET;
 117   fs->regs.reg[21].loc.offset = (long)&sc->sc_b1 - new_cfa;
 118   fs->regs.reg[22].how = REG_SAVED_OFFSET;
 119   fs->regs.reg[22].loc.offset = (long)&sc->sc_b2 - new_cfa;
 120   fs->regs.reg[23].how = REG_SAVED_OFFSET;
 121   fs->regs.reg[23].loc.offset = (long)&sc->sc_b3 - new_cfa;
 122   fs->regs.reg[24].how = REG_SAVED_OFFSET;
 123   fs->regs.reg[24].loc.offset = (long)&sc->sc_l0 - new_cfa;
 124   fs->regs.reg[25].how = REG_SAVED_OFFSET;
 125   fs->regs.reg[25].loc.offset = (long)&sc->sc_l1 - new_cfa;
 126   fs->regs.reg[26].how = REG_SAVED_OFFSET;
 127   fs->regs.reg[26].loc.offset = (long)&sc->sc_l2 - new_cfa;
 128   fs->regs.reg[27].how = REG_SAVED_OFFSET;
 129   fs->regs.reg[27].loc.offset = (long)&sc->sc_l3 - new_cfa;
 130   fs->regs.reg[28].how = REG_SAVED_OFFSET;
 131   fs->regs.reg[28].loc.offset = (long)&sc->sc_m0 - new_cfa;
 132   fs->regs.reg[29].how = REG_SAVED_OFFSET;
 133   fs->regs.reg[29].loc.offset = (long)&sc->sc_m1 - new_cfa;
 134   fs->regs.reg[30].how = REG_SAVED_OFFSET;
 135   fs->regs.reg[30].loc.offset = (long)&sc->sc_m2 - new_cfa;
 136   fs->regs.reg[31].how = REG_SAVED_OFFSET;
 137   fs->regs.reg[31].loc.offset = (long)&sc->sc_m3 - new_cfa;
 138   /* FIXME: Handle A0, A1, CC.  */
 139   fs->regs.reg[35].how = REG_SAVED_OFFSET;
 140   fs->regs.reg[35].loc.offset = (long)&sc->sc_rets - new_cfa;
 141   fs->regs.reg[36].how = REG_SAVED_OFFSET;
 142   fs->regs.reg[36].loc.offset = (long)&sc->sc_pc - new_cfa;
 143   fs->regs.reg[37].how = REG_SAVED_OFFSET;
 144   fs->regs.reg[37].loc.offset = (long)&sc->sc_retx - new_cfa;
 145
 146   fs->regs.reg[40].how = REG_SAVED_OFFSET;
 147   fs->regs.reg[40].loc.offset = (long)&sc->sc_astat - new_cfa;
 148   fs->regs.reg[41].how = REG_SAVED_OFFSET;
 149   fs->regs.reg[41].loc.offset = (long)&sc->sc_seqstat - new_cfa;
 150
 151   fs->regs.reg[44].how = REG_SAVED_OFFSET;
 152   fs->regs.reg[44].loc.offset = (long)&sc->sc_lt0 - new_cfa;
 153   fs->regs.reg[45].how = REG_SAVED_OFFSET;
 154   fs->regs.reg[45].loc.offset = (long)&sc->sc_lt1 - new_cfa;
 155   fs->regs.reg[46].how = REG_SAVED_OFFSET;
 156   fs->regs.reg[46].loc.offset = (long)&sc->sc_lc0 - new_cfa;
 157   fs->regs.reg[47].how = REG_SAVED_OFFSET;
 158   fs->regs.reg[47].loc.offset = (long)&sc->sc_lc1 - new_cfa;
 159   fs->regs.reg[48].how = REG_SAVED_OFFSET;
 160   fs->regs.reg[48].loc.offset = (long)&sc->sc_lb0 - new_cfa;
 161   fs->regs.reg[49].how = REG_SAVED_OFFSET;
 162   fs->regs.reg[49].loc.offset = (long)&sc->sc_lb1 - new_cfa;
 163   fs->retaddr_column = 35;
 164
 165   return _URC_NO_REASON;
 166 }
 167
 168 #endif /* ifdef inhibit_libc */