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c8edd8b484
procfs appears to be broken when debugging on multi-processor
machines. So enable software single stepping in order to avoid
using the procfs interface to do next/step operations, using
internal breakpoints instead.
* infrun.c (handle_inferior_event): Readjust the stop_pc by
DECR_PC_AFTER_BREAK when hitting a single step breakpoint, to
make this pc address equal to the value it would have if the
system stepping capability was used. Also set a new flag used
to ensure that we don't readjust the PC one more time later.
* breakpoint.c (bpstat_stop_status): Do not adjust the PC
address by DECR_PC_AFTER_BREAK when software single step is
in use for this architecture, as this has already been taken
care of in handle_inferior_event().
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/* Target-dependent code for OSF/1 on Alpha.
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Copyright 2002 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 "alpha-tdep.h"
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/* Under OSF/1, the __sigtramp routine is frameless and has a frame
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size of zero, but we are able to backtrace through it. */
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static CORE_ADDR
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alpha_osf1_skip_sigtramp_frame (struct frame_info *frame, CORE_ADDR pc)
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{
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char *name;
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find_pc_partial_function (pc, &name, (CORE_ADDR *) NULL, (CORE_ADDR *) NULL);
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if (PC_IN_SIGTRAMP (pc, name))
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return frame->frame;
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return 0;
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}
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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 && STREQ ("__sigtramp", func_name));
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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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return (read_memory_integer (frame->next ? frame->next->frame
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: frame->frame, 8));
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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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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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tdep->skip_sigtramp_frame = alpha_osf1_skip_sigtramp_frame;
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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, GDB_OSABI_OSF1, alpha_osf1_init_abi);
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}
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