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
7This file is part of libunwind.
8
9Permission is hereby granted, free of charge, to any person obtaining
10a copy of this software and associated documentation files (the
11"Software"), to deal in the Software without restriction, including
12without limitation the rights to use, copy, modify, merge, publish,
13distribute, sublicense, and/or sell copies of the Software, and to
14permit persons to whom the Software is furnished to do so, subject to
15the following conditions:
16
17The above copyright notice and this permission notice shall be
18included in all copies or substantial portions of the Software.
19
20THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26WITH 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
35HIDDEN inline int
36x86_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
66static inline int
67establish_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
101PROTECTED int
102unw_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}
115