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[/] [or1k/] [trunk/] [gdb-5.3/] [gdb/] [i386bsd-tdep.c] - Rev 1773
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/* Target-dependent code for i386 BSD's. Copyright 2001, 2002 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 "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); /* 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, GDB_OSABI_FREEBSD_AOUT, i386fbsdaout_init_abi); gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_ELF, i386fbsd4_init_abi); }
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