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 /* Assuming NEXT_FRAME is for a frame following a BSD sigtramp 36 routine, return the address of the associated sigcontext structure. */ 37 38 static CORE_ADDR 39 i386bsd_sigcontext_addr (struct frame_info *next_frame) 40 { 41 char buf[4]; 42 CORE_ADDR sp; 43 44 frame_unwind_register (next_frame, I386_ESP_REGNUM, buf); 45 sp = extract_unsigned_integer (buf, 4); 46 47 return read_memory_unsigned_integer (sp + 8, 4); 48 } 49 50 51 /* Support for shared libraries. */ 52 53 /* Return non-zero if we are in a shared library trampoline code stub. */ 54 55 int 56 i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name) 57 { 58 return (name && !strcmp (name, "_DYNAMIC")); 59 } 60 61 /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */ 62 63 /* From <machine/signal.h>. */ 64 int i386bsd_sc_reg_offset[] = 65 { 66 -1, /* %eax */ 67 -1, /* %ecx */ 68 -1, /* %edx */ 69 -1, /* %ebx */ 70 8 + 0 * 4, /* %esp */ 71 8 + 1 * 4, /* %ebp */ 72 -1, /* %esi */ 73 -1, /* %edi */ 74 8 + 3 * 4, /* %eip */ 75 8 + 4 * 4, /* %eflags */ 76 -1, /* %cs */ 77 -1, /* %ss */ 78 -1, /* %ds */ 79 -1, /* %es */ 80 -1, /* %fs */ 81 -1 /* %gs */ 82 }; 83 84 void 85 i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 86 { 87 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 88 89 /* Assume SunOS-style shared libraries. */ 90 set_gdbarch_in_solib_call_trampoline (gdbarch, 91 i386bsd_aout_in_solib_call_trampoline); 92 93 tdep->jb_pc_offset = 0; 94 95 tdep->sigtramp_start = 0xfdbfdfc0; 96 tdep->sigtramp_end = 0xfdbfe000; 97 tdep->sigcontext_addr = i386bsd_sigcontext_addr; 98 tdep->sc_reg_offset = i386bsd_sc_reg_offset; 99 tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset); 100 } 101 102 103 static enum gdb_osabi 104 i386bsd_aout_osabi_sniffer (bfd *abfd) 105 { 106 if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0) 107 return GDB_OSABI_NETBSD_AOUT; 108 109 if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0) 110 return GDB_OSABI_FREEBSD_AOUT; 111 112 return GDB_OSABI_UNKNOWN; 113 } 114 115 static enum gdb_osabi 116 i386bsd_core_osabi_sniffer (bfd *abfd) 117 { 118 if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) 119 return GDB_OSABI_NETBSD_AOUT; 120 121 return GDB_OSABI_UNKNOWN; 122 } 123 124 125 /* Provide a prototype to silence -Wmissing-prototypes. */ 126 void _initialize_i386bsd_tdep (void); 127 128 void 129 _initialize_i386bsd_tdep (void) 130 { 131 gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour, 132 i386bsd_aout_osabi_sniffer); 133 134 /* BFD doesn't set a flavour for NetBSD style a.out core files. */ 135 gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_unknown_flavour, 136 i386bsd_core_osabi_sniffer); 137 } 138