| /* Target-dependent code for OSF/1 on Alpha. |
| Copyright 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 "frame.h" |
| #include "gdbcore.h" |
| #include "value.h" |
| #include "osabi.h" |
| #include "gdb_string.h" |
| #include "objfiles.h" |
| |
| #include "alpha-tdep.h" |
| |
| static int |
| alpha_osf1_pc_in_sigtramp (CORE_ADDR pc, char *func_name) |
| { |
| return (func_name != NULL && strcmp ("__sigtramp", func_name) == 0); |
| } |
| |
| static CORE_ADDR |
| alpha_osf1_sigcontext_addr (struct frame_info *frame) |
| { |
| struct frame_info *next_frame = get_next_frame (frame); |
| |
| if (next_frame != NULL) |
| return (read_memory_integer (get_frame_base (next_frame), 8)); |
| else |
| return (read_memory_integer (get_frame_base (frame), 8)); |
| } |
| |
| /* This is the definition of CALL_DUMMY_ADDRESS. It's a heuristic that is used |
| to find a convenient place in the text segment to stick a breakpoint to |
| detect the completion of a target function call (ala call_function_by_hand). |
| */ |
| |
| static CORE_ADDR |
| alpha_call_dummy_address (void) |
| { |
| CORE_ADDR entry; |
| struct minimal_symbol *sym; |
| |
| entry = entry_point_address (); |
| |
| if (entry != 0) |
| return entry; |
| |
| sym = lookup_minimal_symbol ("_Prelude", NULL, symfile_objfile); |
| |
| if (!sym || MSYMBOL_TYPE (sym) != mst_text) |
| return 0; |
| else |
| return SYMBOL_VALUE_ADDRESS (sym) + 4; |
| } |
| |
| static void |
| alpha_osf1_init_abi (struct gdbarch_info info, |
| struct gdbarch *gdbarch) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| /* Hook into the MDEBUG frame unwinder. */ |
| alpha_mdebug_init_abi (info, gdbarch); |
| |
| set_gdbarch_pc_in_sigtramp (gdbarch, alpha_osf1_pc_in_sigtramp); |
| /* The next/step support via procfs on OSF1 is broken when running |
| on multi-processor machines. We need to use software single stepping |
| instead. */ |
| set_gdbarch_software_single_step (gdbarch, alpha_software_single_step); |
| |
| /* Alpha OSF/1 inhibits execution of code on the stack. But there is |
| no need for a dummy on the Alpha. PUSH_ARGUMENTS takes care of all |
| argument handling and bp_call_dummy takes care of stopping the dummy. */ |
| set_gdbarch_call_dummy_address (gdbarch, alpha_call_dummy_address); |
| |
| tdep->sigcontext_addr = alpha_osf1_sigcontext_addr; |
| |
| tdep->jb_pc = 2; |
| tdep->jb_elt_size = 8; |
| } |
| |
| void |
| _initialize_alpha_osf1_tdep (void) |
| { |
| gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OSF1, |
| alpha_osf1_init_abi); |
| } |