src/libs/libunwind/x86_64/Gresume.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 <stdlib.h>
  29
  30 #include "offsets.h"
  31 #include "unwind_i.h"
  32
  33 #ifndef UNW_REMOTE_ONLY
  34
  35 HIDDEN inline int
  36 x86_64_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg)
  37 {
  38   struct cursor *c = (struct cursor *) cursor;
  39   ucontext_t *uc = c->uc;
  40
  41   /* Ensure c->pi is up-to-date.  On x86-64, it's relatively common to
  42      be missing DWARF unwind info.  We don't want to fail in that
  43      case, because the frame-chain still would let us do a backtrace
  44      at least.  */
  45   dwarf_make_proc_info (&c->dwarf);
  46
  47   if (unlikely (c->sigcontext_format != X86_64_SCF_NONE))
  48     {
  49       x86_64_sigreturn(cursor);
  50       abort();
  51     }
  52   else
  53     {
  54       Debug (8, "resuming at ip=%llx via setcontext()\n",
  55              (unsigned long long) c->dwarf.ip);
  56       setcontext (uc);
  57     }
  58   return -UNW_EINVAL;
  59 }
  60
  61 #endif /* !UNW_REMOTE_ONLY */
  62
  63 /* This routine is responsible for copying the register values in
  64    cursor C and establishing them as the current machine state. */
  65
  66 static inline int
  67 establish_machine_state (struct cursor *c)
  68 {
  69   int (*access_reg) (unw_addr_space_t, unw_regnum_t, unw_word_t *,
  70                      int write, void *);
  71   int (*access_fpreg) (unw_addr_space_t, unw_regnum_t, unw_fpreg_t *,
  72                        int write, void *);
  73   unw_addr_space_t as = c->dwarf.as;
  74   void *arg = c->dwarf.as_arg;
  75   unw_fpreg_t fpval;
  76   unw_word_t val;
  77   int reg;
  78
  79   access_reg = as->acc.access_reg;
  80   access_fpreg = as->acc.access_fpreg;
  81
  82   Debug (8, "copying out cursor state\n");
  83
  84   for (reg = 0; reg <= UNW_REG_LAST; ++reg)
  85     {
  86       Debug (16, "copying %s %d\n", unw_regname (reg), reg);
  87       if (unw_is_fpreg (reg))
  88         {
  89           if (tdep_access_fpreg (c, reg, &fpval, 0) >= 0)
  90             (*access_fpreg) (as, reg, &fpval, 1, arg);
  91         }
  92       else
  93         {
  94           if (tdep_access_reg (c, reg, &val, 0) >= 0)
  95             (*access_reg) (as, reg, &val, 1, arg);
  96         }
  97     }
  98   return 0;
  99 }
 100
 101 PROTECTED int
 102 unw_resume (unw_cursor_t *cursor)
 103 {
 104   struct cursor *c = (struct cursor *) cursor;
 105   int ret;
 106
 107   Debug (1, "(cursor=%p)\n", c);
 108
 109   if ((ret = establish_machine_state (c)) < 0)
 110     return ret;
 111
 112   return (*c->dwarf.as->acc.resume) (c->dwarf.as, (unw_cursor_t *) c,
 113                                      c->dwarf.as_arg);
 114 }