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4c1d2973 PA |
1 | /* Target-dependent, architecture-independent code for DICOS, for GDB. |
2 | ||
b811d2c2 | 3 | Copyright (C) 2009-2020 Free Software Foundation, Inc. |
4c1d2973 PA |
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" | |
d55e5aa6 | 22 | #include "solib.h" |
4de283e4 TT |
23 | #include "solib-target.h" |
24 | #include "inferior.h" | |
25 | #include "dicos-tdep.h" | |
0d12e84c | 26 | #include "gdbarch.h" |
4c1d2973 PA |
27 | |
28 | void | |
29 | dicos_init_abi (struct gdbarch *gdbarch) | |
30 | { | |
4c1d2973 PA |
31 | set_solib_ops (gdbarch, &solib_target_so_ops); |
32 | ||
33 | /* Every process, although has its own address space, sees the same | |
2567c7d9 PA |
34 | list of shared libraries. There's no "main executable" in DICOS, |
35 | so this accounts for all code. */ | |
4c1d2973 PA |
36 | set_gdbarch_has_global_solist (gdbarch, 1); |
37 | ||
2567c7d9 PA |
38 | /* The DICOS breakpoint API takes care of magically making |
39 | breakpoints visible to all inferiors. */ | |
40 | set_gdbarch_has_global_breakpoints (gdbarch, 1); | |
41 | ||
4c1d2973 PA |
42 | /* There's no (standard definition of) entry point or a guaranteed |
43 | text location with a symbol where to place the call dummy, so we | |
a9b8d892 JK |
44 | need it on the stack. Rely on i386_gdbarch_init used also for |
45 | amd64 to set up ON_STACK inferior calls. */ | |
4c1d2973 PA |
46 | |
47 | /* DICOS rewinds the PC itself. */ | |
48 | set_gdbarch_decr_pc_after_break (gdbarch, 0); | |
49 | } | |
50 | ||
51 | /* Return true if ABFD is a dicos load module. HEADER_SIZE is the | |
52 | expected size of the "header" section in bytes. */ | |
53 | ||
54 | int | |
55 | dicos_load_module_p (bfd *abfd, int header_size) | |
56 | { | |
57 | long storage_needed; | |
58 | int ret = 0; | |
59 | asymbol **symbol_table = NULL; | |
60 | const char *symname = "Dicos_loadModuleInfo"; | |
61 | asection *section; | |
62 | ||
63 | /* DICOS files don't have a .note.ABI-tag marker or something | |
64 | similar. We do know there's always a "header" section of | |
65 | HEADER_SIZE bytes (size depends on architecture), and there's | |
66 | always a "Dicos_loadModuleInfo" symbol defined. Look for the | |
67 | section first, as that should be cheaper. */ | |
68 | ||
69 | section = bfd_get_section_by_name (abfd, "header"); | |
70 | if (!section) | |
71 | return 0; | |
72 | ||
fd361982 | 73 | if (bfd_section_size (section) != header_size) |
4c1d2973 PA |
74 | return 0; |
75 | ||
76 | /* Dicos LMs always have a "Dicos_loadModuleInfo" symbol | |
77 | defined. Look for it. */ | |
78 | ||
79 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
80 | if (storage_needed < 0) | |
81 | { | |
0963b4bd MS |
82 | warning (_("Can't read elf symbols from %s: %s"), |
83 | bfd_get_filename (abfd), | |
4c1d2973 PA |
84 | bfd_errmsg (bfd_get_error ())); |
85 | return 0; | |
86 | } | |
87 | ||
88 | if (storage_needed > 0) | |
89 | { | |
90 | long i, symcount; | |
91 | ||
224c3ddb | 92 | symbol_table = (asymbol **) xmalloc (storage_needed); |
4c1d2973 PA |
93 | symcount = bfd_canonicalize_symtab (abfd, symbol_table); |
94 | ||
95 | if (symcount < 0) | |
96 | warning (_("Can't read elf symbols from %s: %s"), | |
97 | bfd_get_filename (abfd), | |
98 | bfd_errmsg (bfd_get_error ())); | |
99 | else | |
100 | { | |
101 | for (i = 0; i < symcount; i++) | |
102 | { | |
103 | asymbol *sym = symbol_table[i]; | |
104 | if (sym->name != NULL | |
105 | && symname[0] == sym->name[0] | |
106 | && strcmp (symname + 1, sym->name + 1) == 0) | |
107 | { | |
108 | ret = 1; | |
109 | break; | |
110 | } | |
111 | } | |
112 | } | |
113 | } | |
114 | ||
115 | xfree (symbol_table); | |
116 | return ret; | |
117 | } |