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/tmp/gdb-7.10/gdb/ia64-vms-tdep.c
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1 /* Target-dependent code for OpenVMS IA-64.
2 
3  Copyright (C) 2012-2015 Free Software Foundation, Inc.
4 
5  This file is part of GDB.
6 
7  This program is free software; you can redistribute it and/or modify
8  it under the terms of the GNU General Public License as published by
9  the Free Software Foundation; either version 3 of the License, or
10  (at your option) any later version.
11 
12  This program is distributed in the hope that it will be useful,
13  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  GNU General Public License for more details.
16 
17  You should have received a copy of the GNU General Public License
18  along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 
20 #include "defs.h"
21 #include "frame-unwind.h"
22 #include "ia64-tdep.h"
23 #include "osabi.h"
24 #include "gdbtypes.h"
25 #include "gdbcore.h"
26 
27 #ifdef HAVE_LIBUNWIND_IA64_H
28 
29 /* Libunwind callback accessor function to acquire procedure unwind-info. */
30 
31 static int
32 ia64_vms_find_proc_info_x (unw_addr_space_t as, unw_word_t ip,
33  unw_proc_info_t *pi,
34  int need_unwind_info, void *arg)
35 {
36  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
37  unw_dyn_info_t di;
38  int ret;
39  gdb_byte buf[32];
40  const char *annex = core_addr_to_string (ip);
41  LONGEST res;
42  CORE_ADDR table_addr;
43  unsigned int info_len;
44 
46  annex + 2, buf, 0, sizeof (buf));
47 
48  if (res != sizeof (buf))
49  return -UNW_ENOINFO;
50 
51  pi->format = UNW_INFO_FORMAT_REMOTE_TABLE;
52  pi->start_ip = extract_unsigned_integer (buf + 0, 8, byte_order);
53  pi->end_ip = extract_unsigned_integer (buf + 8, 8, byte_order);
54  pi->gp = extract_unsigned_integer (buf + 24, 8, byte_order);
55  table_addr = extract_unsigned_integer (buf + 16, 8, byte_order);
56 
57  if (table_addr == 0)
58  {
59  /* No unwind data. */
60  pi->unwind_info = NULL;
61  pi->unwind_info_size = 0;
62  return 0;
63  }
64 
65  res = target_read_memory (table_addr, buf, 8);
66  if (res != 0)
67  return -UNW_ENOINFO;
68 
69  /* Check version. */
70  if (extract_unsigned_integer (buf + 6, 2, byte_order) != 1)
71  return -UNW_EBADVERSION;
72  info_len = extract_unsigned_integer (buf + 0, 4, byte_order);
73  pi->unwind_info_size = 8 * info_len;
74 
75  /* Read info. */
76  pi->unwind_info = xmalloc (pi->unwind_info_size);
77 
78  res = target_read_memory (table_addr + 8,
79  pi->unwind_info, pi->unwind_info_size);
80  if (res != 0)
81  {
82  xfree (pi->unwind_info);
83  pi->unwind_info = NULL;
84  return -UNW_ENOINFO;
85  }
86 
87  /* FIXME: Handle OSSD (OS Specific Data). This extension to ia64 unwind
88  information by OpenVMS is currently not handled by libunwind, but
89  looks to be used only in very specific context, and is not generated by
90  GCC. */
91 
92  pi->lsda = table_addr + 8 + pi->unwind_info_size;
93  if (extract_unsigned_integer (buf + 4, 2, byte_order) & 3)
94  {
95  pi->lsda += 8;
96  /* There might be an handler, but this is not used for unwinding. */
97  pi->handler = 0;
98  }
99 
100  return 0;
101 }
102 
103 /* Libunwind callback accessor function for cleanup. */
104 
105 static void
106 ia64_vms_put_unwind_info (unw_addr_space_t as,
107  unw_proc_info_t *pip, void *arg)
108 {
109  /* Nothing required for now. */
110 }
111 
112 /* Libunwind callback accessor function to get head of the dynamic
113  unwind-info registration list. */
114 
115 static int
116 ia64_vms_get_dyn_info_list (unw_addr_space_t as,
117  unw_word_t *dilap, void *arg)
118 {
119  return -UNW_ENOINFO;
120 }
121 
122 /* Set of libunwind callback acccessor functions. */
123 static unw_accessors_t ia64_vms_unw_accessors;
124 static unw_accessors_t ia64_vms_unw_rse_accessors;
125 
126 /* Set of ia64-libunwind-tdep gdb callbacks and data for generic
127  ia64-libunwind-tdep code to use. */
128 static struct libunwind_descr ia64_vms_libunwind_descr;
129 
130 #endif /* HAVE_LIBUNWIND_IA64_H */
131 
132 static void
134 {
136 
137 #ifdef HAVE_LIBUNWIND_IA64_H
138  /* Override the default descriptor. */
139  ia64_vms_unw_accessors = ia64_unw_accessors;
140  ia64_vms_unw_accessors.find_proc_info = ia64_vms_find_proc_info_x;
141  ia64_vms_unw_accessors.put_unwind_info = ia64_vms_put_unwind_info;
142  ia64_vms_unw_accessors.get_dyn_info_list_addr = ia64_vms_get_dyn_info_list;
143 
144  ia64_vms_unw_rse_accessors = ia64_unw_rse_accessors;
145  ia64_vms_unw_rse_accessors.find_proc_info = ia64_vms_find_proc_info_x;
146  ia64_vms_unw_rse_accessors.put_unwind_info = ia64_vms_put_unwind_info;
147  ia64_vms_unw_rse_accessors.get_dyn_info_list_addr = ia64_vms_get_dyn_info_list;
148 
149  ia64_vms_libunwind_descr = ia64_libunwind_descr;
150  ia64_vms_libunwind_descr.accessors = &ia64_vms_unw_accessors;
151  ia64_vms_libunwind_descr.special_accessors = &ia64_vms_unw_rse_accessors;
152 
153  libunwind_frame_set_descr (gdbarch, &ia64_vms_libunwind_descr);
154 #endif
155 }
156 
157 /* Provide a prototype to silence -Wmissing-prototypes. */
159 
160 void
162 {
163  gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_OPENVMS,
165 }
struct gdbarch * target_gdbarch(void)
Definition: gdbarch.c:5143
ULONGEST extract_unsigned_integer(const gdb_byte *, int, enum bfd_endian)
Definition: findvar.c:84
void libunwind_frame_set_descr(struct gdbarch *gdbarch, struct libunwind_descr *descr)
bfd_vma CORE_ADDR
Definition: common-types.h:41
void xfree(void *)
Definition: common-utils.c:97
initialize_file_ftype _initialize_ia64_vms_tdep
const struct floatformat * floatformats_ia64_quad[BFD_ENDIAN_UNKNOWN]
Definition: gdbtypes.c:98
struct target_ops current_target
void initialize_file_ftype(void)
Definition: defs.h:281
enum bfd_endian gdbarch_byte_order(struct gdbarch *gdbarch)
Definition: gdbarch.c:1420
static void ia64_openvms_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
void * xmalloc(YYSIZE_T)
bfd_byte gdb_byte
Definition: common-types.h:38
int target_read_memory(CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
Definition: target.c:1393
LONGEST target_read(struct target_ops *ops, enum target_object object, const char *annex, gdb_byte *buf, ULONGEST offset, LONGEST len)
Definition: target.c:1590
void set_gdbarch_long_double_format(struct gdbarch *gdbarch, const struct floatformat **long_double_format)
Definition: gdbarch.c:1683
void gdbarch_register_osabi(enum bfd_architecture arch, unsigned long machine, enum gdb_osabi osabi, void(*init_osabi)(struct gdbarch_info, struct gdbarch *))
Definition: osabi.c:148
long long LONGEST
Definition: common-types.h:52