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42a4f53d | 1 | /* Copyright (C) 2016-2019 Free Software Foundation, Inc. |
e1c3a373 JG |
2 | |
3 | This file is part of GDB. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include "defs.h" | |
d55e5aa6 TT |
19 | |
20 | /* Local non-gdb includes. */ | |
e1c3a373 | 21 | #include "arm-tdep.h" |
d55e5aa6 | 22 | #include "objfiles.h" |
e1c3a373 JG |
23 | #include "osabi.h" |
24 | ||
25 | /* The gdbarch_register_osabi handler for ARM PikeOS; it performs | |
26 | the gdbarch initialization for that platform. */ | |
27 | ||
28 | static void | |
29 | arm_pikeos_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
30 | { | |
31 | /* Single stepping. */ | |
32 | set_gdbarch_software_single_step (gdbarch, arm_software_single_step); | |
33 | } | |
34 | ||
35 | /* The ARM PikeOS OSABI sniffer (see gdbarch_register_osabi_sniffer). | |
36 | Returns GDB_OSABI_PIKEOS if the given BFD is a PikeOS binary, | |
37 | GDB_OSABI_UNKNOWN otherwise. */ | |
38 | ||
39 | static enum gdb_osabi | |
40 | arm_pikeos_osabi_sniffer (bfd *abfd) | |
41 | { | |
42 | long number_of_symbols; | |
43 | long i; | |
44 | int pikeos_stack_found = 0; | |
45 | int pikeos_stack_size_found = 0; | |
46 | ||
47 | /* The BFD target of PikeOS is really just standard elf, so we | |
48 | cannot use it to detect this variant. The only common thing that | |
49 | may be found in PikeOS modules are symbols _vm_stack/__p4_stack and | |
50 | _vm_stack_size/__p4_stack_end. They are used to specify the stack | |
51 | location and size; and defined by the default linker script. | |
52 | ||
53 | OS ABI sniffers are called before the minimal symtabs are | |
54 | created. So inspect the symbol table using BFD. */ | |
55 | ||
56 | long storage_needed = bfd_get_symtab_upper_bound (abfd); | |
57 | if (storage_needed <= 0) | |
58 | return GDB_OSABI_UNKNOWN; | |
59 | ||
60 | gdb::unique_xmalloc_ptr<asymbol *> symbol_table | |
61 | ((asymbol **) xmalloc (storage_needed)); | |
62 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table.get ()); | |
63 | ||
64 | if (number_of_symbols <= 0) | |
65 | return GDB_OSABI_UNKNOWN; | |
66 | ||
67 | for (i = 0; i < number_of_symbols; i++) | |
68 | { | |
69 | const char *name = bfd_asymbol_name (symbol_table.get ()[i]); | |
70 | ||
71 | if (strcmp (name, "_vm_stack") == 0 | |
72 | || strcmp (name, "__p4_stack") == 0) | |
73 | pikeos_stack_found = 1; | |
74 | ||
75 | if (strcmp (name, "_vm_stack_size") == 0 | |
76 | || strcmp (name, "__p4_stack_end") == 0) | |
77 | pikeos_stack_size_found = 1; | |
78 | } | |
79 | ||
80 | if (pikeos_stack_found && pikeos_stack_size_found) | |
81 | return GDB_OSABI_PIKEOS; | |
82 | else | |
83 | return GDB_OSABI_UNKNOWN; | |
84 | } | |
85 | ||
86 | void | |
87 | _initialize_arm_pikeos_tdep (void) | |
88 | { | |
89 | /* Register the sniffer for the PikeOS targets. */ | |
90 | gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_elf_flavour, | |
91 | arm_pikeos_osabi_sniffer); | |
92 | gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_PIKEOS, | |
93 | arm_pikeos_init_abi); | |
94 | } |