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104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
/* Target-dependent code for OSF/1 on Alpha.
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Copyright 2002, 2003 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "frame.h"
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#include "gdbcore.h"
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#include "value.h"
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#include "osabi.h"
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#include "gdb_string.h"
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#include "objfiles.h"
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#include "alpha-tdep.h"
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static int
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alpha_osf1_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
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{
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return (func_name != NULL && strcmp ("__sigtramp", func_name) == 0);
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}
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static CORE_ADDR
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alpha_osf1_sigcontext_addr (struct frame_info *frame)
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{
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struct frame_info *next_frame = get_next_frame (frame);
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if (next_frame != NULL)
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return (read_memory_integer (get_frame_base (next_frame), 8));
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else
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return (read_memory_integer (get_frame_base (frame), 8));
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}
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/* This is the definition of CALL_DUMMY_ADDRESS. It's a heuristic that is used
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to find a convenient place in the text segment to stick a breakpoint to
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detect the completion of a target function call (ala call_function_by_hand).
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*/
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static CORE_ADDR
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alpha_call_dummy_address (void)
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{
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CORE_ADDR entry;
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struct minimal_symbol *sym;
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entry = entry_point_address ();
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if (entry != 0)
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return entry;
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sym = lookup_minimal_symbol ("_Prelude", NULL, symfile_objfile);
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if (!sym || MSYMBOL_TYPE (sym) != mst_text)
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return 0;
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else
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return SYMBOL_VALUE_ADDRESS (sym) + 4;
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}
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static void
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alpha_osf1_init_abi (struct gdbarch_info info,
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struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Hook into the MDEBUG frame unwinder. */
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alpha_mdebug_init_abi (info, gdbarch);
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set_gdbarch_pc_in_sigtramp (gdbarch, alpha_osf1_pc_in_sigtramp);
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/* The next/step support via procfs on OSF1 is broken when running
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on multi-processor machines. We need to use software single stepping
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instead. */
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set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
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/* Alpha OSF/1 inhibits execution of code on the stack. But there is
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no need for a dummy on the Alpha. PUSH_ARGUMENTS takes care of all
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argument handling and bp_call_dummy takes care of stopping the dummy. */
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set_gdbarch_call_dummy_address (gdbarch, alpha_call_dummy_address);
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tdep->sigcontext_addr = alpha_osf1_sigcontext_addr;
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tdep->jb_pc = 2;
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tdep->jb_elt_size = 8;
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}
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void
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_initialize_alpha_osf1_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OSF1,
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alpha_osf1_init_abi);
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}
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