| 1 | /* Target-dependent code for OSF/1 on Alpha. |
| 2 | Copyright (C) 2002, 2003, 2007, 2008, 2009 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include "defs.h" |
| 20 | #include "frame.h" |
| 21 | #include "gdbcore.h" |
| 22 | #include "value.h" |
| 23 | #include "osabi.h" |
| 24 | #include "gdb_string.h" |
| 25 | #include "objfiles.h" |
| 26 | |
| 27 | #include "alpha-tdep.h" |
| 28 | |
| 29 | static int |
| 30 | alpha_osf1_pc_in_sigtramp (struct gdbarch *gdbarch, |
| 31 | CORE_ADDR pc, char *func_name) |
| 32 | { |
| 33 | return (func_name != NULL && strcmp ("__sigtramp", func_name) == 0); |
| 34 | } |
| 35 | |
| 36 | static CORE_ADDR |
| 37 | alpha_osf1_sigcontext_addr (struct frame_info *this_frame) |
| 38 | { |
| 39 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 40 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 41 | struct frame_info *next_frame = get_next_frame (this_frame); |
| 42 | struct frame_id next_id = null_frame_id; |
| 43 | |
| 44 | if (next_frame != NULL) |
| 45 | next_id = get_frame_id (next_frame); |
| 46 | |
| 47 | return (read_memory_integer (next_id.stack_addr, 8, byte_order)); |
| 48 | } |
| 49 | |
| 50 | static void |
| 51 | alpha_osf1_init_abi (struct gdbarch_info info, |
| 52 | struct gdbarch *gdbarch) |
| 53 | { |
| 54 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 55 | |
| 56 | /* Hook into the MDEBUG frame unwinder. */ |
| 57 | alpha_mdebug_init_abi (info, gdbarch); |
| 58 | |
| 59 | /* The next/step support via procfs on OSF1 is broken when running |
| 60 | on multi-processor machines. We need to use software single stepping |
| 61 | instead. */ |
| 62 | set_gdbarch_software_single_step (gdbarch, alpha_software_single_step); |
| 63 | |
| 64 | tdep->sigcontext_addr = alpha_osf1_sigcontext_addr; |
| 65 | tdep->pc_in_sigtramp = alpha_osf1_pc_in_sigtramp; |
| 66 | |
| 67 | tdep->jb_pc = 2; |
| 68 | tdep->jb_elt_size = 8; |
| 69 | } |
| 70 | |
| 71 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 72 | extern initialize_file_ftype _initialize_alpha_osf1_tdep; |
| 73 | |
| 74 | void |
| 75 | _initialize_alpha_osf1_tdep (void) |
| 76 | { |
| 77 | gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OSF1, |
| 78 | alpha_osf1_init_abi); |
| 79 | } |