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      1 /* libunwind - a platform-independent unwind library
      2    Copyright (C) 2006-2007 IBM
      3    Contributed by
      4      Corey Ashford <cjashfor (at) us.ibm.com>
      5      Jose Flavio Aguilar Paulino <jflavio (at) br.ibm.com> <joseflavio (at) gmail.com>
      6 
      7 This file is part of libunwind.
      8 
      9 Permission is hereby granted, free of charge, to any person obtaining
     10 a copy of this software and associated documentation files (the
     11 "Software"), to deal in the Software without restriction, including
     12 without limitation the rights to use, copy, modify, merge, publish,
     13 distribute, sublicense, and/or sell copies of the Software, and to
     14 permit persons to whom the Software is furnished to do so, subject to
     15 the following conditions:
     16 
     17 The above copyright notice and this permission notice shall be
     18 included in all copies or substantial portions of the Software.
     19 
     20 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     21 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     22 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     23 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     24 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     25 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     26 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
     27 
     28 #include "unwind_i.h"
     29 
     30 HIDDEN int
     31 tdep_access_reg (struct cursor *c, unw_regnum_t reg, unw_word_t *valp,
     32 		 int write)
     33 {
     34   struct dwarf_loc loc;
     35 
     36   switch (reg)
     37     {
     38     case UNW_TDEP_IP:
     39       if (write)
     40 	{
     41 	  c->dwarf.ip = *valp;	/* update the IP cache */
     42 	  if (c->dwarf.pi_valid && (*valp < c->dwarf.pi.start_ip
     43 				    || *valp >= c->dwarf.pi.end_ip))
     44 	    c->dwarf.pi_valid = 0;	/* new IP outside of current proc */
     45 	}
     46       else
     47 	*valp = c->dwarf.ip;
     48       return 0;
     49 
     50     case UNW_TDEP_SP:
     51       if (write)
     52 	return -UNW_EREADONLYREG;
     53       *valp = c->dwarf.cfa;
     54       return 0;
     55 
     56 
     57     default:
     58       break;
     59     }
     60 
     61   /* make sure it's not an FP or VR register */
     62   if ((((unsigned) (reg - UNW_PPC32_F0)) <= 31))
     63     return -UNW_EBADREG;
     64 
     65   loc = c->dwarf.loc[reg];
     66 
     67   if (write)
     68     return dwarf_put (&c->dwarf, loc, *valp);
     69   else
     70     return dwarf_get (&c->dwarf, loc, valp);
     71 }
     72 
     73 HIDDEN int
     74 tdep_access_fpreg (struct cursor *c, unw_regnum_t reg, unw_fpreg_t *valp,
     75 		   int write)
     76 {
     77   struct dwarf_loc loc;
     78 
     79   if ((unsigned) (reg - UNW_PPC32_F0) < 32)
     80   {
     81     loc = c->dwarf.loc[reg];
     82     if (write)
     83       return dwarf_putfp (&c->dwarf, loc, *valp);
     84     else
     85       return dwarf_getfp (&c->dwarf, loc, valp);
     86   }
     87 
     88   return -UNW_EBADREG;
     89 }
     90 
     91