| 1 | /* Target-dependent code for i386 BSD's. |
| 2 | |
| 3 | Copyright (C) 2001, 2002, 2003, 2004, 2007, 2008, 2009 |
| 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 | \f |
| 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 | \f |
| 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 | \f |
| 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 | } |