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/* 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"
/* Under OSF/1, the __sigtramp routine is frameless and has a frame
size of zero, but we are able to backtrace through it. */
static CORE_ADDR
alpha_osf1_skip_sigtramp_frame (struct frame_info *frame, CORE_ADDR pc)
{
char *name;
find_pc_partial_function (pc, &name, (CORE_ADDR *) NULL, (CORE_ADDR *) NULL);
if (PC_IN_SIGTRAMP (pc, name))
return frame->frame;
return 0;
}
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)
{
return (read_memory_integer (frame->next ? frame->next->frame
: frame->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);
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->skip_sigtramp_frame = alpha_osf1_skip_sigtramp_frame;
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);
}
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