src/libs/libunwind/x86_64/Gregs.c

   1 /* libunwind - a platform-independent unwind library
   2    Copyright (c) 2002-2004 Hewlett-Packard Development Company, L.P.
   3         Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
   4
   5    Modified for x86_64 by Max Asbock <masbock@us.ibm.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 #if 0
  31 static inline dwarf_loc_t
  32 linux_scratch_loc (struct cursor *c, unw_regnum_t reg)
  33 {
  34   unw_word_t addr = c->sigcontext_addr;
  35
  36   switch (c->sigcontext_format)
  37     {
  38     case X86_64_SCF_NONE:
  39       return DWARF_REG_LOC (&c->dwarf, reg);
  40
  41     case X86_64_SCF_LINUX_RT_SIGFRAME:
  42       addr += LINUX_UC_MCONTEXT_OFF;
  43       break;
  44
  45     case X86_64_SCF_FREEBSD_SIGFRAME:
  46       addr += FREEBSD_UC_MCONTEXT_OFF;
  47       break;
  48     }
  49
  50   return DWARF_REG_LOC (&c->dwarf, reg);
  51
  52 }
  53
  54 HIDDEN dwarf_loc_t
  55 x86_64_scratch_loc (struct cursor *c, unw_regnum_t reg)
  56 {
  57   if (c->sigcontext_addr)
  58     return linux_scratch_loc (c, reg);
  59   else
  60     return DWARF_REG_LOC (&c->dwarf, reg);
  61 }
  62 #endif
  63
  64 HIDDEN int
  65 tdep_access_reg (struct cursor *c, unw_regnum_t reg, unw_word_t *valp,
  66                  int write)
  67 {
  68   dwarf_loc_t loc = DWARF_NULL_LOC;
  69   unsigned int mask;
  70   int arg_num;
  71
  72   switch (reg)
  73     {
  74
  75     case UNW_X86_64_RIP:
  76       if (write)
  77         c->dwarf.ip = *valp;            /* also update the RIP cache */
  78       loc = c->dwarf.loc[RIP];
  79       break;
  80
  81     case UNW_X86_64_CFA:
  82     case UNW_X86_64_RSP:
  83       if (write)
  84         return -UNW_EREADONLYREG;
  85       *valp = c->dwarf.cfa;
  86       return 0;
  87
  88     case UNW_X86_64_RAX:
  89     case UNW_X86_64_RDX:
  90       arg_num = reg - UNW_X86_64_RAX;
  91       mask = (1 << arg_num);
  92       if (write)
  93         {
  94           c->dwarf.eh_args[arg_num] = *valp;
  95           c->dwarf.eh_valid_mask |= mask;
  96           return 0;
  97         }
  98       else if ((c->dwarf.eh_valid_mask & mask) != 0)
  99         {
 100           *valp = c->dwarf.eh_args[arg_num];
 101           return 0;
 102         }
 103       else
 104         loc = c->dwarf.loc[(reg == UNW_X86_64_RAX) ? RAX : RDX];
 105       break;
 106
 107     case UNW_X86_64_RCX: loc = c->dwarf.loc[RCX]; break;
 108     case UNW_X86_64_RBX: loc = c->dwarf.loc[RBX]; break;
 109
 110     case UNW_X86_64_RBP: loc = c->dwarf.loc[RBP]; break;
 111     case UNW_X86_64_RSI: loc = c->dwarf.loc[RSI]; break;
 112     case UNW_X86_64_RDI: loc = c->dwarf.loc[RDI]; break;
 113     case UNW_X86_64_R8: loc = c->dwarf.loc[R8]; break;
 114     case UNW_X86_64_R9: loc = c->dwarf.loc[R9]; break;
 115     case UNW_X86_64_R10: loc = c->dwarf.loc[R10]; break;
 116     case UNW_X86_64_R11: loc = c->dwarf.loc[R11]; break;
 117     case UNW_X86_64_R12: loc = c->dwarf.loc[R12]; break;
 118     case UNW_X86_64_R13: loc = c->dwarf.loc[R13]; break;
 119     case UNW_X86_64_R14: loc = c->dwarf.loc[R14]; break;
 120     case UNW_X86_64_R15: loc = c->dwarf.loc[R15]; break;
 121
 122     default:
 123       Debug (1, "bad register number %u\n", reg);
 124       return -UNW_EBADREG;
 125     }
 126
 127   if (write)
 128     return dwarf_put (&c->dwarf, loc, *valp);
 129   else
 130     return dwarf_get (&c->dwarf, loc, valp);
 131 }
 132
 133 HIDDEN int
 134 tdep_access_fpreg (struct cursor *c, unw_regnum_t reg, unw_fpreg_t *valp,
 135                    int write)
 136 {
 137       return -UNW_EBADREG;
 138 }