_UPT_access_mem.c revision 3d6f7479b04b153f43bc9918a1bad25e3e8d2cd7 
1/* libunwind - a platform-independent unwind library
2   Copyright (C) 2003-2004 Hewlett-Packard Co
3	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4   Copyright (C) 2010 Konstantin Belousov <kib@freebsd.org>
5
6This file is part of libunwind.
7
8Permission is hereby granted, free of charge, to any person obtaining
9a copy of this software and associated documentation files (the
10"Software"), to deal in the Software without restriction, including
11without limitation the rights to use, copy, modify, merge, publish,
12distribute, sublicense, and/or sell copies of the Software, and to
13permit persons to whom the Software is furnished to do so, subject to
14the following conditions:
15
16The above copyright notice and this permission notice shall be
17included in all copies or substantial portions of the Software.
18
19THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
22NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
23LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
24OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
25WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
26
27#include "_UPT_internal.h"
28
29#if HAVE_DECL_PTRACE_POKEDATA || HAVE_TTRACE
30int
31_UPT_access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val,
32		 int write, void *arg)
33{
34  struct UPT_info *ui = arg;
35  if (!ui)
36	return -UNW_EINVAL;
37
38  pid_t pid = ui->pid;
39
40  errno = 0;
41  if (write)
42    {
43      Debug (16, "mem[%lx] <- %lx\n", (long) addr, (long) *val);
44#ifdef HAVE_TTRACE
45#	warning No support for ttrace() yet.
46#else
47      ptrace (PTRACE_POKEDATA, pid, addr, *val);
48      if (errno)
49	return -UNW_EINVAL;
50#endif
51    }
52  else
53    {
54#ifdef HAVE_TTRACE
55#	warning No support for ttrace() yet.
56#else
57      *val = ptrace (PTRACE_PEEKDATA, pid, addr, 0);
58      if (errno)
59	return -UNW_EINVAL;
60#endif
61      Debug (16, "mem[%lx] -> %lx\n", (long) addr, (long) *val);
62    }
63  return 0;
64}
65#elif HAVE_DECL_PT_IO
66int
67_UPT_access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val,
68		 int write, void *arg)
69{
70  struct UPT_info *ui = arg;
71  if (!ui)
72	return -UNW_EINVAL;
73  pid_t pid = ui->pid;
74  struct ptrace_io_desc iod;
75
76  iod.piod_offs = (void *)addr;
77  iod.piod_addr = val;
78  iod.piod_len = sizeof(*val);
79  iod.piod_op = write ? PIOD_WRITE_D : PIOD_READ_D;
80  if (write)
81    Debug (16, "mem[%lx] <- %lx\n", (long) addr, (long) *val);
82  if (ptrace(PT_IO, pid, (caddr_t)&iod, 0) == -1)
83    return -UNW_EINVAL;
84  if (!write)
85     Debug (16, "mem[%lx] -> %lx\n", (long) addr, (long) *val);
86  return 0;
87}
88#else
89#error Fix me
90#endif
91