| /* Target-dependent code for Cygwin running on i386's, for GDB. |
| Copyright 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 "gdb_string.h" |
| #include "gdbcore.h" |
| #include "i386-tdep.h" |
| #include "osabi.h" |
| #include "frame.h" |
| #include "dummy-frame.h" |
| |
| static int |
| i386_cygwin_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe) |
| { |
| /* In the context where this is used, we get the saved PC before we've |
| successfully unwound far enough to be sure what we've got (it may |
| be a signal handler caller). If we're dealing with a signal |
| handler caller, this will return valid, which is fine. If not, |
| it'll make the correct test. */ |
| return ((get_frame_type (thisframe) == SIGTRAMP_FRAME) || chain != 0); |
| } |
| /* Return the chain-pointer for FRAME. In the case of the i386, the |
| frame's nominal address is the address of a 4-byte word containing |
| the calling frame's address. */ |
| static CORE_ADDR |
| i386_cygwin_frame_chain (struct frame_info *frame) |
| { |
| if (pc_in_dummy_frame (get_frame_pc (frame))) |
| return get_frame_base (frame); |
| |
| if (get_frame_type (frame) == SIGTRAMP_FRAME |
| || i386_frameless_signal_p (frame)) |
| return get_frame_base (frame); |
| |
| return read_memory_unsigned_integer (get_frame_base (frame), 4); |
| } |
| |
| static void |
| i386_cygwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| tdep->struct_return = reg_struct_return; |
| set_gdbarch_deprecated_frame_chain (gdbarch, i386_cygwin_frame_chain); |
| set_gdbarch_deprecated_frame_chain_valid (gdbarch, i386_cygwin_frame_chain_valid); |
| } |
| |
| static enum gdb_osabi |
| i386_cygwin_osabi_sniffer (bfd * abfd) |
| { |
| char *target_name = bfd_get_target (abfd); |
| |
| /* Interix also uses pei-i386. |
| We need a way to distinguish between the two. */ |
| if (strcmp (target_name, "pei-i386") == 0) |
| return GDB_OSABI_CYGWIN; |
| |
| return GDB_OSABI_UNKNOWN; |
| } |
| |
| void |
| _initialize_i386_cygwin_tdep (void) |
| { |
| gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour, |
| i386_cygwin_osabi_sniffer); |
| |
| gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_CYGWIN, |
| i386_cygwin_init_abi); |
| } |