| 1 | /* Target-dependent code for Cygwin running on i386's, for GDB. |
| 2 | |
| 3 | Copyright (C) 2003-2019 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 "i386-tdep.h" |
| 23 | #include "windows-tdep.h" |
| 24 | #include "regset.h" |
| 25 | #include "gdb_obstack.h" |
| 26 | #include "xml-support.h" |
| 27 | #include "gdbcore.h" |
| 28 | #include "inferior.h" |
| 29 | |
| 30 | /* Core file support. */ |
| 31 | |
| 32 | /* This vector maps GDB's idea of a register's number into an address |
| 33 | in the windows exception context vector. */ |
| 34 | |
| 35 | static int i386_windows_gregset_reg_offset[] = |
| 36 | { |
| 37 | 176, /* eax */ |
| 38 | 172, /* ecx */ |
| 39 | 168, /* edx */ |
| 40 | 164, /* ebx */ |
| 41 | |
| 42 | 196, /* esp */ |
| 43 | 180, /* ebp */ |
| 44 | 160, /* esi */ |
| 45 | 156, /* edi */ |
| 46 | |
| 47 | 184, /* eip */ |
| 48 | 192, /* eflags */ |
| 49 | 188, /* cs */ |
| 50 | 200, /* ss */ |
| 51 | |
| 52 | 152, /* ds */ |
| 53 | 148, /* es */ |
| 54 | 144, /* fs */ |
| 55 | 140, /* gs */ |
| 56 | |
| 57 | 56, /* FloatSave.RegisterArea[0 * 10] */ |
| 58 | 66, /* FloatSave.RegisterArea[1 * 10] */ |
| 59 | 76, /* FloatSave.RegisterArea[2 * 10] */ |
| 60 | 86, /* FloatSave.RegisterArea[3 * 10] */ |
| 61 | 96, /* FloatSave.RegisterArea[4 * 10] */ |
| 62 | 106, /* FloatSave.RegisterArea[5 * 10] */ |
| 63 | 116, /* FloatSave.RegisterArea[6 * 10] */ |
| 64 | 126, /* FloatSave.RegisterArea[7 * 10] */ |
| 65 | |
| 66 | 28, /* FloatSave.ControlWord */ |
| 67 | 32, /* FloatSave.StatusWord */ |
| 68 | 36, /* FloatSave.TagWord */ |
| 69 | 44, /* FloatSave.ErrorSelector */ |
| 70 | 40, /* FloatSave.ErrorOffset */ |
| 71 | 52, /* FloatSave.DataSelector */ |
| 72 | 48, /* FloatSave.DataOffset */ |
| 73 | 44, /* FloatSave.ErrorSelector */ |
| 74 | |
| 75 | /* XMM0-7 */ |
| 76 | 364, /* ExtendedRegisters[10*16] */ |
| 77 | 380, /* ExtendedRegisters[11*16] */ |
| 78 | 396, /* ExtendedRegisters[12*16] */ |
| 79 | 412, /* ExtendedRegisters[13*16] */ |
| 80 | 428, /* ExtendedRegisters[14*16] */ |
| 81 | 444, /* ExtendedRegisters[15*16] */ |
| 82 | 460, /* ExtendedRegisters[16*16] */ |
| 83 | 476, /* ExtendedRegisters[17*16] */ |
| 84 | |
| 85 | /* MXCSR */ |
| 86 | 228 /* ExtendedRegisters[24] */ |
| 87 | }; |
| 88 | |
| 89 | #define I386_WINDOWS_SIZEOF_GREGSET 716 |
| 90 | |
| 91 | struct cpms_data |
| 92 | { |
| 93 | struct gdbarch *gdbarch; |
| 94 | struct obstack *obstack; |
| 95 | int module_count; |
| 96 | }; |
| 97 | |
| 98 | static void |
| 99 | core_process_module_section (bfd *abfd, asection *sect, void *obj) |
| 100 | { |
| 101 | struct cpms_data *data = (struct cpms_data *) obj; |
| 102 | enum bfd_endian byte_order = gdbarch_byte_order (data->gdbarch); |
| 103 | |
| 104 | char *module_name; |
| 105 | size_t module_name_size; |
| 106 | CORE_ADDR base_addr; |
| 107 | |
| 108 | gdb_byte *buf = NULL; |
| 109 | |
| 110 | if (!startswith (sect->name, ".module")) |
| 111 | return; |
| 112 | |
| 113 | buf = (gdb_byte *) xmalloc (bfd_section_size (sect) + 1); |
| 114 | if (!buf) |
| 115 | { |
| 116 | printf_unfiltered ("memory allocation failed for %s\n", sect->name); |
| 117 | goto out; |
| 118 | } |
| 119 | if (!bfd_get_section_contents (abfd, sect, |
| 120 | buf, 0, bfd_section_size (sect))) |
| 121 | goto out; |
| 122 | |
| 123 | |
| 124 | |
| 125 | /* A DWORD (data_type) followed by struct windows_core_module_info. */ |
| 126 | |
| 127 | base_addr = |
| 128 | extract_unsigned_integer (buf + 4, 4, byte_order); |
| 129 | |
| 130 | module_name_size = |
| 131 | extract_unsigned_integer (buf + 8, 4, byte_order); |
| 132 | |
| 133 | if (12 + module_name_size > bfd_section_size (sect)) |
| 134 | goto out; |
| 135 | module_name = (char *) buf + 12; |
| 136 | |
| 137 | /* The first module is the .exe itself. */ |
| 138 | if (data->module_count != 0) |
| 139 | windows_xfer_shared_library (module_name, base_addr, |
| 140 | data->gdbarch, data->obstack); |
| 141 | data->module_count++; |
| 142 | |
| 143 | out: |
| 144 | if (buf) |
| 145 | xfree (buf); |
| 146 | return; |
| 147 | } |
| 148 | |
| 149 | static ULONGEST |
| 150 | windows_core_xfer_shared_libraries (struct gdbarch *gdbarch, |
| 151 | gdb_byte *readbuf, |
| 152 | ULONGEST offset, ULONGEST len) |
| 153 | { |
| 154 | struct obstack obstack; |
| 155 | const char *buf; |
| 156 | ULONGEST len_avail; |
| 157 | struct cpms_data data = { gdbarch, &obstack, 0 }; |
| 158 | |
| 159 | obstack_init (&obstack); |
| 160 | obstack_grow_str (&obstack, "<library-list>\n"); |
| 161 | bfd_map_over_sections (core_bfd, |
| 162 | core_process_module_section, |
| 163 | &data); |
| 164 | obstack_grow_str0 (&obstack, "</library-list>\n"); |
| 165 | |
| 166 | buf = (const char *) obstack_finish (&obstack); |
| 167 | len_avail = strlen (buf); |
| 168 | if (offset >= len_avail) |
| 169 | return 0; |
| 170 | |
| 171 | if (len > len_avail - offset) |
| 172 | len = len_avail - offset; |
| 173 | memcpy (readbuf, buf + offset, len); |
| 174 | |
| 175 | obstack_free (&obstack, NULL); |
| 176 | return len; |
| 177 | } |
| 178 | |
| 179 | /* This is how we want PTIDs from core files to be printed. */ |
| 180 | |
| 181 | static std::string |
| 182 | i386_windows_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid) |
| 183 | { |
| 184 | if (ptid.lwp () != 0) |
| 185 | return string_printf ("Thread 0x%lx", ptid.lwp ()); |
| 186 | |
| 187 | return normal_pid_to_str (ptid); |
| 188 | } |
| 189 | |
| 190 | static CORE_ADDR |
| 191 | i386_cygwin_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
| 192 | { |
| 193 | return i386_pe_skip_trampoline_code (frame, pc, NULL); |
| 194 | } |
| 195 | |
| 196 | static const char * |
| 197 | i386_cygwin_auto_wide_charset (void) |
| 198 | { |
| 199 | return "UTF-16"; |
| 200 | } |
| 201 | |
| 202 | static void |
| 203 | i386_cygwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 204 | { |
| 205 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 206 | |
| 207 | windows_init_abi (info, gdbarch); |
| 208 | |
| 209 | set_gdbarch_skip_trampoline_code (gdbarch, i386_cygwin_skip_trampoline_code); |
| 210 | |
| 211 | set_gdbarch_skip_main_prologue (gdbarch, i386_skip_main_prologue); |
| 212 | |
| 213 | tdep->struct_return = reg_struct_return; |
| 214 | |
| 215 | tdep->gregset_reg_offset = i386_windows_gregset_reg_offset; |
| 216 | tdep->gregset_num_regs = ARRAY_SIZE (i386_windows_gregset_reg_offset); |
| 217 | tdep->sizeof_gregset = I386_WINDOWS_SIZEOF_GREGSET; |
| 218 | |
| 219 | tdep->sizeof_fpregset = 0; |
| 220 | |
| 221 | /* Core file support. */ |
| 222 | set_gdbarch_core_xfer_shared_libraries |
| 223 | (gdbarch, windows_core_xfer_shared_libraries); |
| 224 | set_gdbarch_core_pid_to_str (gdbarch, i386_windows_core_pid_to_str); |
| 225 | |
| 226 | set_gdbarch_auto_wide_charset (gdbarch, i386_cygwin_auto_wide_charset); |
| 227 | } |
| 228 | |
| 229 | static enum gdb_osabi |
| 230 | i386_cygwin_osabi_sniffer (bfd *abfd) |
| 231 | { |
| 232 | const char *target_name = bfd_get_target (abfd); |
| 233 | |
| 234 | if (strcmp (target_name, "pei-i386") == 0) |
| 235 | return GDB_OSABI_CYGWIN; |
| 236 | |
| 237 | /* Cygwin uses elf core dumps. Do not claim all ELF executables, |
| 238 | check whether there is a .reg section of proper size. */ |
| 239 | if (strcmp (target_name, "elf32-i386") == 0) |
| 240 | { |
| 241 | asection *section = bfd_get_section_by_name (abfd, ".reg"); |
| 242 | if (section |
| 243 | && bfd_section_size (section) == I386_WINDOWS_SIZEOF_GREGSET) |
| 244 | return GDB_OSABI_CYGWIN; |
| 245 | } |
| 246 | |
| 247 | return GDB_OSABI_UNKNOWN; |
| 248 | } |
| 249 | |
| 250 | void |
| 251 | _initialize_i386_cygwin_tdep (void) |
| 252 | { |
| 253 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour, |
| 254 | i386_cygwin_osabi_sniffer); |
| 255 | |
| 256 | /* Cygwin uses elf core dumps. */ |
| 257 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour, |
| 258 | i386_cygwin_osabi_sniffer); |
| 259 | |
| 260 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_CYGWIN, |
| 261 | i386_cygwin_init_abi); |
| 262 | } |