1 /* Target-dependent code for i386 BSD's. 2 3 Copyright (C) 2001, 2002, 2003, 2004, 2007, 2008, 2009, 2010 4 Free Software Foundation, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21 #include "defs.h" 22 #include "arch-utils.h" 23 #include "frame.h" 24 #include "gdbcore.h" 25 #include "regcache.h" 26 #include "osabi.h" 27 28 #include "gdb_string.h" 29 30 #include "i386-tdep.h" 31 32 /* Support for signal handlers. */ 33 34 /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the 35 address of the associated sigcontext structure. */ 36 37 static CORE_ADDR 38 i386bsd_sigcontext_addr (struct frame_info *this_frame) 39 { 40 struct gdbarch *gdbarch = get_frame_arch (this_frame); 41 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); 42 gdb_byte buf[4]; 43 CORE_ADDR sp; 44 45 get_frame_register (this_frame, I386_ESP_REGNUM, buf); 46 sp = extract_unsigned_integer (buf, 4, byte_order); 47 48 return read_memory_unsigned_integer (sp + 8, 4, byte_order); 49 } 50 51 52 /* Support for shared libraries. */ 53 54 /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */ 55 56 /* From <machine/signal.h>. */ 57 int i386bsd_sc_reg_offset[] = 58 { 59 -1, /* %eax */ 60 -1, /* %ecx */ 61 -1, /* %edx */ 62 -1, /* %ebx */ 63 8 + 0 * 4, /* %esp */ 64 8 + 1 * 4, /* %ebp */ 65 -1, /* %esi */ 66 -1, /* %edi */ 67 8 + 3 * 4, /* %eip */ 68 8 + 4 * 4, /* %eflags */ 69 -1, /* %cs */ 70 -1, /* %ss */ 71 -1, /* %ds */ 72 -1, /* %es */ 73 -1, /* %fs */ 74 -1 /* %gs */ 75 }; 76 77 void 78 i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 79 { 80 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 81 82 tdep->jb_pc_offset = 0; 83 84 tdep->sigtramp_start = 0xfdbfdfc0; 85 tdep->sigtramp_end = 0xfdbfe000; 86 tdep->sigcontext_addr = i386bsd_sigcontext_addr; 87 tdep->sc_reg_offset = i386bsd_sc_reg_offset; 88 tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset); 89 } 90 91 92 static enum gdb_osabi 93 i386bsd_aout_osabi_sniffer (bfd *abfd) 94 { 95 if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0) 96 return GDB_OSABI_NETBSD_AOUT; 97 98 if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0) 99 return GDB_OSABI_FREEBSD_AOUT; 100 101 return GDB_OSABI_UNKNOWN; 102 } 103 104 static enum gdb_osabi 105 i386bsd_core_osabi_sniffer (bfd *abfd) 106 { 107 if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) 108 return GDB_OSABI_NETBSD_AOUT; 109 110 return GDB_OSABI_UNKNOWN; 111 } 112 113 114 /* Provide a prototype to silence -Wmissing-prototypes. */ 115 void _initialize_i386bsd_tdep (void); 116 117 void 118 _initialize_i386bsd_tdep (void) 119 { 120 gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour, 121 i386bsd_aout_osabi_sniffer); 122 123 /* BFD doesn't set a flavour for NetBSD style a.out core files. */ 124 gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_unknown_flavour, 125 i386bsd_core_osabi_sniffer); 126 } 127