1/* Target-dependent code for i386 BSD's. 2 3 Copyright (C) 2001, 2002, 2003, 2004, 2007 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 NEXT_FRAME is for a frame following a BSD sigtramp 34 routine, return the address of the associated sigcontext structure. */ 35 36static CORE_ADDR 37i386bsd_sigcontext_addr (struct frame_info *next_frame) 38{ 39 gdb_byte buf[4]; 40 CORE_ADDR sp; 41 42 frame_unwind_register (next_frame, I386_ESP_REGNUM, buf); 43 sp = extract_unsigned_integer (buf, 4); 44 45 return read_memory_unsigned_integer (sp + 8, 4); 46} 47 48 49/* Support for shared libraries. */ 50 51/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */ 52 53/* From <machine/signal.h>. */ 54int i386bsd_sc_reg_offset[] = 55{ 56 -1, /* %eax */ 57 -1, /* %ecx */ 58 -1, /* %edx */ 59 -1, /* %ebx */ 60 8 + 0 * 4, /* %esp */ 61 8 + 1 * 4, /* %ebp */ 62 -1, /* %esi */ 63 -1, /* %edi */ 64 8 + 3 * 4, /* %eip */ 65 8 + 4 * 4, /* %eflags */ 66 -1, /* %cs */ 67 -1, /* %ss */ 68 -1, /* %ds */ 69 -1, /* %es */ 70 -1, /* %fs */ 71 -1 /* %gs */ 72}; 73 74void 75i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 76{ 77 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 78 79 tdep->jb_pc_offset = 0; 80 81 tdep->sigtramp_start = 0xfdbfdfc0; 82 tdep->sigtramp_end = 0xfdbfe000; 83 tdep->sigcontext_addr = i386bsd_sigcontext_addr; 84 tdep->sc_reg_offset = i386bsd_sc_reg_offset; 85 tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset); 86} 87 88 89static enum gdb_osabi 90i386bsd_aout_osabi_sniffer (bfd *abfd) 91{ 92 if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0) 93 return GDB_OSABI_NETBSD_AOUT; 94 95 if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0) 96 return GDB_OSABI_FREEBSD_AOUT; 97 98 return GDB_OSABI_UNKNOWN; 99} 100 101static enum gdb_osabi 102i386bsd_core_osabi_sniffer (bfd *abfd) 103{ 104 if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) 105 return GDB_OSABI_NETBSD_AOUT; 106 107 return GDB_OSABI_UNKNOWN; 108} 109 110 111/* Provide a prototype to silence -Wmissing-prototypes. */ 112void _initialize_i386bsd_tdep (void); 113 114void 115_initialize_i386bsd_tdep (void) 116{ 117 gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour, 118 i386bsd_aout_osabi_sniffer); 119 120 /* BFD doesn't set a flavour for NetBSD style a.out core files. */ 121 gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_unknown_flavour, 122 i386bsd_core_osabi_sniffer); 123} 124