| /* Target-dependent code for i386 BSD's. |
| Copyright 2001, 2002, 2003 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "arch-utils.h" |
| #include "frame.h" |
| #include "gdbcore.h" |
| #include "regcache.h" |
| #include "osabi.h" |
| |
| #include "gdb_string.h" |
| |
| #include "i386-tdep.h" |
| |
| /* Support for signal handlers. */ |
| |
| /* Return whether PC is in a BSD sigtramp routine. */ |
| |
| static int |
| i386bsd_pc_in_sigtramp (CORE_ADDR pc, char *name) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| |
| return (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end); |
| } |
| |
| /* Assuming FRAME is for a BSD sigtramp routine, return the address of |
| the associated sigcontext structure. |
| |
| Note: This function is used for Solaris 2 too, so don't make it |
| static. */ |
| |
| CORE_ADDR |
| i386bsd_sigcontext_addr (struct frame_info *frame) |
| { |
| if (frame->next) |
| /* If this isn't the top frame, the next frame must be for the |
| signal handler itself. A pointer to the sigcontext structure |
| is passed as the third argument to the signal handler. */ |
| return read_memory_unsigned_integer (frame->next->frame + 16, 4); |
| |
| /* This is the top frame. We'll have to find the address of the |
| sigcontext structure by looking at the stack pointer. */ |
| return read_memory_unsigned_integer (read_register (SP_REGNUM) + 8, 4); |
| } |
| |
| /* Return the start address of the sigtramp routine. */ |
| |
| CORE_ADDR |
| i386bsd_sigtramp_start (CORE_ADDR pc) |
| { |
| return gdbarch_tdep (current_gdbarch)->sigtramp_start; |
| } |
| |
| /* Return the end address of the sigtramp routine. */ |
| |
| CORE_ADDR |
| i386bsd_sigtramp_end (CORE_ADDR pc) |
| { |
| return gdbarch_tdep (current_gdbarch)->sigtramp_end; |
| } |
| |
| |
| /* Support for shared libraries. */ |
| |
| /* Return non-zero if we are in a shared library trampoline code stub. */ |
| |
| int |
| i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name) |
| { |
| return (name && !strcmp (name, "_DYNAMIC")); |
| } |
| |
| /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */ |
| |
| /* From <machine/signal.h>. */ |
| int i386bsd_sc_pc_offset = 20; |
| int i386bsd_sc_sp_offset = 8; |
| |
| void |
| i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| set_gdbarch_pc_in_sigtramp (gdbarch, i386bsd_pc_in_sigtramp); |
| |
| /* Allow the recognition of sigtramps as a function named <sigtramp>. */ |
| set_gdbarch_sigtramp_start (gdbarch, i386bsd_sigtramp_start); |
| set_gdbarch_sigtramp_end (gdbarch, i386bsd_sigtramp_end); |
| |
| /* Assume SunOS-style shared libraries. */ |
| set_gdbarch_in_solib_call_trampoline (gdbarch, |
| i386bsd_aout_in_solib_call_trampoline); |
| |
| tdep->jb_pc_offset = 0; |
| |
| tdep->sigtramp_start = 0xfdbfdfc0; |
| tdep->sigtramp_end = 0xfdbfe000; |
| tdep->sigcontext_addr = i386bsd_sigcontext_addr; |
| tdep->sc_pc_offset = i386bsd_sc_pc_offset; |
| tdep->sc_sp_offset = i386bsd_sc_sp_offset; |
| } |
| |
| /* FreeBSD 3.0-RELEASE or later. */ |
| |
| CORE_ADDR i386fbsd_sigtramp_start = 0xbfbfdf20; |
| CORE_ADDR i386fbsd_sigtramp_end = 0xbfbfdff0; |
| |
| static void |
| i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| /* Obviously FreeBSD is BSD-based. */ |
| i386bsd_init_abi (info, gdbarch); |
| |
| /* FreeBSD uses -freg-struct-return by default. */ |
| tdep->struct_return = reg_struct_return; |
| |
| /* FreeBSD uses a different memory layout. */ |
| tdep->sigtramp_start = i386fbsd_sigtramp_start; |
| tdep->sigtramp_end = i386fbsd_sigtramp_end; |
| } |
| |
| static void |
| i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| /* It's almost identical to FreeBSD a.out. */ |
| i386fbsdaout_init_abi (info, gdbarch); |
| |
| /* Except that it uses ELF. */ |
| i386_elf_init_abi (info, gdbarch); |
| |
| /* FreeBSD ELF uses SVR4-style shared libraries. */ |
| set_gdbarch_in_solib_call_trampoline (gdbarch, |
| generic_in_solib_call_trampoline); |
| } |
| |
| /* FreeBSD 4.0-RELEASE or later. */ |
| |
| /* From <machine/signal.h>. */ |
| int i386fbsd4_sc_pc_offset = 76; |
| int i386fbsd4_sc_sp_offset = 88; |
| |
| static void |
| i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| /* Inherit stuff from older releases. We assume that FreeBSD |
| 4.0-RELEASE always uses ELF. */ |
| i386fbsd_init_abi (info, gdbarch); |
| |
| /* FreeBSD 4.0 introduced a new `struct sigcontext'. */ |
| tdep->sc_pc_offset = i386fbsd4_sc_pc_offset; |
| tdep->sc_sp_offset = i386fbsd4_sc_sp_offset; |
| } |
| |
| |
| static enum gdb_osabi |
| i386bsd_aout_osabi_sniffer (bfd *abfd) |
| { |
| if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0) |
| return GDB_OSABI_NETBSD_AOUT; |
| |
| if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0) |
| return GDB_OSABI_FREEBSD_AOUT; |
| |
| return GDB_OSABI_UNKNOWN; |
| } |
| |
| |
| /* Provide a prototype to silence -Wmissing-prototypes. */ |
| void _initialize_i386bsd_tdep (void); |
| |
| void |
| _initialize_i386bsd_tdep (void) |
| { |
| gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour, |
| i386bsd_aout_osabi_sniffer); |
| |
| gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_AOUT, |
| i386fbsdaout_init_abi); |
| gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_ELF, |
| i386fbsd4_init_abi); |
| } |