| 1 | /* Target-dependent code for i386 BSD's. |
| 2 | |
| 3 | Copyright 2001, 2002, 2003 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 2 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, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "arch-utils.h" |
| 24 | #include "frame.h" |
| 25 | #include "gdbcore.h" |
| 26 | #include "regcache.h" |
| 27 | #include "osabi.h" |
| 28 | |
| 29 | #include "gdb_string.h" |
| 30 | |
| 31 | #include "i386-tdep.h" |
| 32 | |
| 33 | /* Support for signal handlers. */ |
| 34 | |
| 35 | /* Return whether PC is in a BSD sigtramp routine. */ |
| 36 | |
| 37 | static int |
| 38 | i386bsd_pc_in_sigtramp (CORE_ADDR pc, char *name) |
| 39 | { |
| 40 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 41 | |
| 42 | return (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end); |
| 43 | } |
| 44 | |
| 45 | /* Assuming NEXT_FRAME is for a frame following a BSD sigtramp |
| 46 | routine, return the address of the associated sigcontext structure. */ |
| 47 | |
| 48 | static CORE_ADDR |
| 49 | i386bsd_sigcontext_addr (struct frame_info *next_frame) |
| 50 | { |
| 51 | char buf[4]; |
| 52 | CORE_ADDR sp; |
| 53 | |
| 54 | frame_unwind_register (next_frame, I386_ESP_REGNUM, buf); |
| 55 | sp = extract_unsigned_integer (buf, 4); |
| 56 | |
| 57 | return read_memory_unsigned_integer (sp + 8, 4); |
| 58 | } |
| 59 | |
| 60 | /* Return the start address of the sigtramp routine. */ |
| 61 | |
| 62 | CORE_ADDR |
| 63 | i386bsd_sigtramp_start (CORE_ADDR pc) |
| 64 | { |
| 65 | return gdbarch_tdep (current_gdbarch)->sigtramp_start; |
| 66 | } |
| 67 | |
| 68 | /* Return the end address of the sigtramp routine. */ |
| 69 | |
| 70 | CORE_ADDR |
| 71 | i386bsd_sigtramp_end (CORE_ADDR pc) |
| 72 | { |
| 73 | return gdbarch_tdep (current_gdbarch)->sigtramp_end; |
| 74 | } |
| 75 | \f |
| 76 | |
| 77 | /* Support for shared libraries. */ |
| 78 | |
| 79 | /* Return non-zero if we are in a shared library trampoline code stub. */ |
| 80 | |
| 81 | int |
| 82 | i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name) |
| 83 | { |
| 84 | return (name && !strcmp (name, "_DYNAMIC")); |
| 85 | } |
| 86 | |
| 87 | /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */ |
| 88 | |
| 89 | /* From <machine/signal.h>. */ |
| 90 | int i386bsd_sc_reg_offset[] = |
| 91 | { |
| 92 | -1, /* %eax */ |
| 93 | -1, /* %ecx */ |
| 94 | -1, /* %edx */ |
| 95 | -1, /* %ebx */ |
| 96 | 8 + 0 * 4, /* %esp */ |
| 97 | 8 + 1 * 4, /* %ebp */ |
| 98 | -1, /* %esi */ |
| 99 | -1, /* %edi */ |
| 100 | 8 + 3 * 4, /* %eip */ |
| 101 | 8 + 4 * 4, /* %eflags */ |
| 102 | -1, /* %cs */ |
| 103 | -1, /* %ss */ |
| 104 | -1, /* %ds */ |
| 105 | -1, /* %es */ |
| 106 | -1, /* %fs */ |
| 107 | -1 /* %gs */ |
| 108 | }; |
| 109 | |
| 110 | void |
| 111 | i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 112 | { |
| 113 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 114 | |
| 115 | set_gdbarch_pc_in_sigtramp (gdbarch, i386bsd_pc_in_sigtramp); |
| 116 | |
| 117 | /* Allow the recognition of sigtramps as a function named <sigtramp>. */ |
| 118 | set_gdbarch_sigtramp_start (gdbarch, i386bsd_sigtramp_start); |
| 119 | set_gdbarch_sigtramp_end (gdbarch, i386bsd_sigtramp_end); |
| 120 | |
| 121 | /* Assume SunOS-style shared libraries. */ |
| 122 | set_gdbarch_in_solib_call_trampoline (gdbarch, |
| 123 | i386bsd_aout_in_solib_call_trampoline); |
| 124 | |
| 125 | tdep->jb_pc_offset = 0; |
| 126 | |
| 127 | tdep->sigtramp_start = 0xfdbfdfc0; |
| 128 | tdep->sigtramp_end = 0xfdbfe000; |
| 129 | tdep->sigcontext_addr = i386bsd_sigcontext_addr; |
| 130 | tdep->sc_reg_offset = i386bsd_sc_reg_offset; |
| 131 | tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset); |
| 132 | } |
| 133 | |
| 134 | \f |
| 135 | static enum gdb_osabi |
| 136 | i386bsd_aout_osabi_sniffer (bfd *abfd) |
| 137 | { |
| 138 | if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0) |
| 139 | return GDB_OSABI_NETBSD_AOUT; |
| 140 | |
| 141 | if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0) |
| 142 | return GDB_OSABI_FREEBSD_AOUT; |
| 143 | |
| 144 | return GDB_OSABI_UNKNOWN; |
| 145 | } |
| 146 | |
| 147 | \f |
| 148 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 149 | void _initialize_i386bsd_tdep (void); |
| 150 | |
| 151 | void |
| 152 | _initialize_i386bsd_tdep (void) |
| 153 | { |
| 154 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour, |
| 155 | i386bsd_aout_osabi_sniffer); |
| 156 | } |