| 1 | /* Target-dependent, architecture-independent code for DICOS, for GDB. |
| 2 | |
| 3 | Copyright (C) 2009-2012 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 "gdb_string.h" |
| 23 | #include "solib.h" |
| 24 | #include "solib-target.h" |
| 25 | #include "inferior.h" |
| 26 | #include "dicos-tdep.h" |
| 27 | |
| 28 | void |
| 29 | dicos_init_abi (struct gdbarch *gdbarch) |
| 30 | { |
| 31 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 32 | |
| 33 | set_solib_ops (gdbarch, &solib_target_so_ops); |
| 34 | |
| 35 | /* Every process, although has its own address space, sees the same |
| 36 | list of shared libraries. There's no "main executable" in DICOS, |
| 37 | so this accounts for all code. */ |
| 38 | set_gdbarch_has_global_solist (gdbarch, 1); |
| 39 | |
| 40 | /* The DICOS breakpoint API takes care of magically making |
| 41 | breakpoints visible to all inferiors. */ |
| 42 | set_gdbarch_has_global_breakpoints (gdbarch, 1); |
| 43 | |
| 44 | /* There's no (standard definition of) entry point or a guaranteed |
| 45 | text location with a symbol where to place the call dummy, so we |
| 46 | need it on the stack. Rely on i386_gdbarch_init used also for |
| 47 | amd64 to set up ON_STACK inferior calls. */ |
| 48 | |
| 49 | /* DICOS rewinds the PC itself. */ |
| 50 | set_gdbarch_decr_pc_after_break (gdbarch, 0); |
| 51 | } |
| 52 | |
| 53 | /* Return true if ABFD is a dicos load module. HEADER_SIZE is the |
| 54 | expected size of the "header" section in bytes. */ |
| 55 | |
| 56 | int |
| 57 | dicos_load_module_p (bfd *abfd, int header_size) |
| 58 | { |
| 59 | long storage_needed; |
| 60 | int ret = 0; |
| 61 | asymbol **symbol_table = NULL; |
| 62 | const char *symname = "Dicos_loadModuleInfo"; |
| 63 | asection *section; |
| 64 | |
| 65 | /* DICOS files don't have a .note.ABI-tag marker or something |
| 66 | similar. We do know there's always a "header" section of |
| 67 | HEADER_SIZE bytes (size depends on architecture), and there's |
| 68 | always a "Dicos_loadModuleInfo" symbol defined. Look for the |
| 69 | section first, as that should be cheaper. */ |
| 70 | |
| 71 | section = bfd_get_section_by_name (abfd, "header"); |
| 72 | if (!section) |
| 73 | return 0; |
| 74 | |
| 75 | if (bfd_section_size (abfd, section) != header_size) |
| 76 | return 0; |
| 77 | |
| 78 | /* Dicos LMs always have a "Dicos_loadModuleInfo" symbol |
| 79 | defined. Look for it. */ |
| 80 | |
| 81 | storage_needed = bfd_get_symtab_upper_bound (abfd); |
| 82 | if (storage_needed < 0) |
| 83 | { |
| 84 | warning (_("Can't read elf symbols from %s: %s"), |
| 85 | bfd_get_filename (abfd), |
| 86 | bfd_errmsg (bfd_get_error ())); |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | if (storage_needed > 0) |
| 91 | { |
| 92 | long i, symcount; |
| 93 | |
| 94 | symbol_table = xmalloc (storage_needed); |
| 95 | symcount = bfd_canonicalize_symtab (abfd, symbol_table); |
| 96 | |
| 97 | if (symcount < 0) |
| 98 | warning (_("Can't read elf symbols from %s: %s"), |
| 99 | bfd_get_filename (abfd), |
| 100 | bfd_errmsg (bfd_get_error ())); |
| 101 | else |
| 102 | { |
| 103 | for (i = 0; i < symcount; i++) |
| 104 | { |
| 105 | asymbol *sym = symbol_table[i]; |
| 106 | if (sym->name != NULL |
| 107 | && symname[0] == sym->name[0] |
| 108 | && strcmp (symname + 1, sym->name + 1) == 0) |
| 109 | { |
| 110 | ret = 1; |
| 111 | break; |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | xfree (symbol_table); |
| 118 | return ret; |
| 119 | } |