1 /* Target-dependent code for i386 BSD's. 2 3 Copyright (C) 2001-2013 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 "arch-utils.h" 22 #include "frame.h" 23 #include "gdbcore.h" 24 #include "regcache.h" 25 #include "osabi.h" 26 27 #include "gdb_string.h" 28 29 #include "i386-tdep.h" 30 31 /* Support for signal handlers. */ 32 33 /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the 34 address of the associated sigcontext structure. */ 35 36 static CORE_ADDR 37 i386bsd_sigcontext_addr (struct frame_info *this_frame) 38 { 39 struct gdbarch *gdbarch = get_frame_arch (this_frame); 40 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); 41 gdb_byte buf[4]; 42 CORE_ADDR sp; 43 44 get_frame_register (this_frame, I386_ESP_REGNUM, buf); 45 sp = extract_unsigned_integer (buf, 4, byte_order); 46 47 return read_memory_unsigned_integer (sp + 8, 4, byte_order); 48 } 49 50 51 /* Support for shared libraries. */ 52 53 /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */ 54 55 /* From <machine/signal.h>. */ 56 int i386bsd_sc_reg_offset[] = 57 { 58 -1, /* %eax */ 59 -1, /* %ecx */ 60 -1, /* %edx */ 61 -1, /* %ebx */ 62 8 + 0 * 4, /* %esp */ 63 8 + 1 * 4, /* %ebp */ 64 -1, /* %esi */ 65 -1, /* %edi */ 66 8 + 3 * 4, /* %eip */ 67 8 + 4 * 4, /* %eflags */ 68 -1, /* %cs */ 69 -1, /* %ss */ 70 -1, /* %ds */ 71 -1, /* %es */ 72 -1, /* %fs */ 73 -1 /* %gs */ 74 }; 75 76 void 77 i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 78 { 79 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 80 81 tdep->jb_pc_offset = 0; 82 83 tdep->sigtramp_start = 0xfdbfdfc0; 84 tdep->sigtramp_end = 0xfdbfe000; 85 tdep->sigcontext_addr = i386bsd_sigcontext_addr; 86 tdep->sc_reg_offset = i386bsd_sc_reg_offset; 87 tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset); 88 } 89 90 91 static enum gdb_osabi 92 i386bsd_aout_osabi_sniffer (bfd *abfd) 93 { 94 if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0) 95 return GDB_OSABI_NETBSD_AOUT; 96 97 if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0) 98 return GDB_OSABI_FREEBSD_AOUT; 99 100 return GDB_OSABI_UNKNOWN; 101 } 102 103 static enum gdb_osabi 104 i386bsd_core_osabi_sniffer (bfd *abfd) 105 { 106 if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) 107 return GDB_OSABI_NETBSD_AOUT; 108 109 return GDB_OSABI_UNKNOWN; 110 } 111 112 113 /* Provide a prototype to silence -Wmissing-prototypes. */ 114 void _initialize_i386bsd_tdep (void); 115 116 void 117 _initialize_i386bsd_tdep (void) 118 { 119 gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour, 120 i386bsd_aout_osabi_sniffer); 121 122 /* BFD doesn't set a flavour for NetBSD style a.out core files. */ 123 gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_unknown_flavour, 124 i386bsd_core_osabi_sniffer); 125 } 126