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/tmp/gdb-7.10/gdb/dicos-tdep.c
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1 /* Target-dependent, architecture-independent code for DICOS, for GDB.
2 
3  Copyright (C) 2009-2015 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 "osabi.h"
22 #include "solib.h"
23 #include "solib-target.h"
24 #include "inferior.h"
25 #include "dicos-tdep.h"
26 
27 void
29 {
30  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
31 
33 
34  /* Every process, although has its own address space, sees the same
35  list of shared libraries. There's no "main executable" in DICOS,
36  so this accounts for all code. */
37  set_gdbarch_has_global_solist (gdbarch, 1);
38 
39  /* The DICOS breakpoint API takes care of magically making
40  breakpoints visible to all inferiors. */
42 
43  /* There's no (standard definition of) entry point or a guaranteed
44  text location with a symbol where to place the call dummy, so we
45  need it on the stack. Rely on i386_gdbarch_init used also for
46  amd64 to set up ON_STACK inferior calls. */
47 
48  /* DICOS rewinds the PC itself. */
50 }
51 
52 /* Return true if ABFD is a dicos load module. HEADER_SIZE is the
53  expected size of the "header" section in bytes. */
54 
55 int
56 dicos_load_module_p (bfd *abfd, int header_size)
57 {
58  long storage_needed;
59  int ret = 0;
60  asymbol **symbol_table = NULL;
61  const char *symname = "Dicos_loadModuleInfo";
62  asection *section;
63 
64  /* DICOS files don't have a .note.ABI-tag marker or something
65  similar. We do know there's always a "header" section of
66  HEADER_SIZE bytes (size depends on architecture), and there's
67  always a "Dicos_loadModuleInfo" symbol defined. Look for the
68  section first, as that should be cheaper. */
69 
70  section = bfd_get_section_by_name (abfd, "header");
71  if (!section)
72  return 0;
73 
74  if (bfd_section_size (abfd, section) != header_size)
75  return 0;
76 
77  /* Dicos LMs always have a "Dicos_loadModuleInfo" symbol
78  defined. Look for it. */
79 
80  storage_needed = bfd_get_symtab_upper_bound (abfd);
81  if (storage_needed < 0)
82  {
83  warning (_("Can't read elf symbols from %s: %s"),
84  bfd_get_filename (abfd),
85  bfd_errmsg (bfd_get_error ()));
86  return 0;
87  }
88 
89  if (storage_needed > 0)
90  {
91  long i, symcount;
92 
93  symbol_table = xmalloc (storage_needed);
94  symcount = bfd_canonicalize_symtab (abfd, symbol_table);
95 
96  if (symcount < 0)
97  warning (_("Can't read elf symbols from %s: %s"),
98  bfd_get_filename (abfd),
99  bfd_errmsg (bfd_get_error ()));
100  else
101  {
102  for (i = 0; i < symcount; i++)
103  {
104  asymbol *sym = symbol_table[i];
105  if (sym->name != NULL
106  && symname[0] == sym->name[0]
107  && strcmp (symname + 1, sym->name + 1) == 0)
108  {
109  ret = 1;
110  break;
111  }
112  }
113  }
114  }
115 
116  xfree (symbol_table);
117  return ret;
118 }
void xfree(void *)
Definition: common-utils.c:97
void set_solib_ops(struct gdbarch *gdbarch, const struct target_so_ops *new_ops)
Definition: solib.c:76
void warning(const char *fmt,...)
Definition: errors.c:26
void set_gdbarch_has_global_solist(struct gdbarch *gdbarch, int has_global_solist)
Definition: gdbarch.c:4356
#define _(String)
Definition: gdb_locale.h:40
struct gdbarch_tdep * gdbarch_tdep(struct gdbarch *gdbarch)
Definition: gdbarch.c:1402
struct target_so_ops solib_target_so_ops
Definition: solib-target.c:487
void dicos_init_abi(struct gdbarch *gdbarch)
Definition: dicos-tdep.c:28
void set_gdbarch_decr_pc_after_break(struct gdbarch *gdbarch, CORE_ADDR decr_pc_after_break)
Definition: gdbarch.c:2764
void set_gdbarch_has_global_breakpoints(struct gdbarch *gdbarch, int has_global_breakpoints)
Definition: gdbarch.c:4373
void * xmalloc(YYSIZE_T)
int dicos_load_module_p(bfd *abfd, int header_size)
Definition: dicos-tdep.c:56