1/* Target-dependent code for i386 BSD's. 2 3 Copyright 2001, 2002, 2003, 2004 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 37int 38i386bsd_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 48static CORE_ADDR 49i386bsd_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 62CORE_ADDR 63i386bsd_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 70CORE_ADDR 71i386bsd_sigtramp_end (CORE_ADDR pc) 72{ 73 return gdbarch_tdep (current_gdbarch)->sigtramp_end; 74} 75 76 77/* Support for shared libraries. */ 78 79/* Return non-zero if we are in a shared library trampoline code stub. */ 80 81int 82i386bsd_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>. */ 90int 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 110void 111i386bsd_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 135static enum gdb_osabi 136i386bsd_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 147static enum gdb_osabi 148i386bsd_core_osabi_sniffer (bfd *abfd) 149{ 150 if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) 151 return GDB_OSABI_NETBSD_AOUT; 152 153 return GDB_OSABI_UNKNOWN; 154} 155 156 157/* Provide a prototype to silence -Wmissing-prototypes. */ 158void _initialize_i386bsd_tdep (void); 159 160void 161_initialize_i386bsd_tdep (void) 162{ 163 gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour, 164 i386bsd_aout_osabi_sniffer); 165 166 /* BFD doesn't set the architecture for NetBSD style a.out core 167 files. */ 168 gdbarch_register_osabi_sniffer (bfd_arch_unknown, bfd_target_unknown_flavour, 169 i386bsd_core_osabi_sniffer); 170} 171