1/* libunwind - a platform-independent unwind library
2   Copyright (C) 2010 Konstantin Belousov <kib@freebsd.org>
3
4This file is part of libunwind.
5
6Permission is hereby granted, free of charge, to any person obtaining
7a copy of this software and associated documentation files (the
8"Software"), to deal in the Software without restriction, including
9without limitation the rights to use, copy, modify, merge, publish,
10distribute, sublicense, and/or sell copies of the Software, and to
11permit persons to whom the Software is furnished to do so, subject to
12the following conditions:
13
14The above copyright notice and this permission notice shall be
15included in all copies or substantial portions of the Software.
16
17THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
24
25#include <sys/param.h>
26#include <sys/types.h>
27#include <sys/mman.h>
28#include <sys/sysctl.h>
29#include <sys/user.h>
30#include <stdio.h>
31#include <errno.h>
32
33#include "libunwind_i.h"
34
35static void *
36get_mem(size_t sz)
37{
38  void *res;
39
40  res = mmap(NULL, sz, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
41  if (res == MAP_FAILED)
42    return (NULL);
43  return (res);
44}
45
46static void
47free_mem(void *ptr, size_t sz)
48{
49  munmap(ptr, sz);
50}
51
52static int
53get_pid_by_tid(int tid)
54{
55  int mib[3], error;
56  size_t len, len1;
57  char *buf;
58  struct kinfo_proc *kv;
59  int i, pid;
60
61  len = 0;
62  mib[0] = CTL_KERN;
63  mib[1] = KERN_PROC;
64  mib[2] = KERN_PROC_ALL;
65
66  error = sysctl(mib, 3, NULL, &len, NULL, 0);
67  if (error == -1)
68    return (-1);
69  len1 = len * 4 / 3;
70  buf = get_mem(len1);
71  if (buf == NULL)
72    return (-1);
73  len = len1;
74  error = sysctl(mib, 3, buf, &len, NULL, 0);
75  if (error == -1) {
76    free_mem(buf, len1);
77    return (-1);
78  }
79  pid = -1;
80  for (i = 0, kv = (struct kinfo_proc *)buf; i < len / sizeof(*kv);
81   i++, kv++) {
82    if (kv->ki_tid == tid) {
83      pid = kv->ki_pid;
84      break;
85    }
86  }
87  free_mem(buf, len1);
88  return (pid);
89}
90
91/* ANDROID support update. */
92struct map_info *
93map_create_list(pid_t pid)
94{
95  int mib[4], error, ret;
96  size_t len, len1;
97  char *buf, *bp, *eb;
98  struct kinfo_vmentry *kv;
99  struct map_info *map_list = NULL;
100
101  len = 0;
102  mib[0] = CTL_KERN;
103  mib[1] = KERN_PROC;
104  mib[2] = KERN_PROC_VMMAP;
105  mib[3] = pid;
106
107  error = sysctl(mib, 4, NULL, &len, NULL, 0);
108  if (error == -1) {
109    if (errno == ESRCH)
110      {
111        mib[3] = get_pid_by_tid(pid);
112        if (mib[3] != -1)
113          error = sysctl(mib, 4, NULL, &len, NULL, 0);
114        if (error == -1)
115          return (-UNW_EUNSPEC);
116      }
117    else
118      return (-UNW_EUNSPEC);
119  }
120  len1 = len * 4 / 3;
121  buf = get_mem(len1);
122  if (buf == NULL)
123    return (-UNW_EUNSPEC);
124  len = len1;
125  error = sysctl(mib, 4, buf, &len, NULL, 0);
126  if (error == -1)
127    {
128      free_mem(buf, len1);
129      return (-UNW_EUNSPEC);
130    }
131  ret = -UNW_EUNSPEC;
132  for (bp = buf, eb = buf + len; bp < eb; bp += kv->kve_structsize)
133    {
134      kv = (struct kinfo_vmentry *)(uintptr_t)bp;
135      if (kv->kve_type != KVME_TYPE_VNODE)
136        continue;
137
138      cur_map = map_alloc_info ();
139      if (cur_map == NULL)
140        break;
141      cur_map->next = map_list;
142      cur_map->start = kv->kve_start;
143      cur_map->end = kv->kv_end;
144      cur_map->offset = kv->kve_offset;
145      cur_map->path = strdup(kv->kve_path);
146      mutex_init (&cur_map->ei_lock);
147      cur_map->ei.size = 0;
148      cur_map->ei.image = NULL;
149      cur_map->ei_shared = 0;
150    }
151  free_mem(buf, len1);
152
153  return map_list;
154}
155/* End of ANDROID update. */
156