1 /* Target-dependent code for OSF/1 on Alpha.
2 Copyright 2002, 2003 Free Software Foundation, Inc.
4 This file is part of GDB.
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 2 of the License, or
9 (at your option) any later version.
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.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
28 #include "alpha-tdep.h"
30 /* Under OSF/1, the __sigtramp routine is frameless and has a frame
31 size of zero, but we are able to backtrace through it. */
33 alpha_osf1_skip_sigtramp_frame (struct frame_info
*frame
, CORE_ADDR pc
)
37 find_pc_partial_function (pc
, &name
, (CORE_ADDR
*) NULL
, (CORE_ADDR
*) NULL
);
38 if (PC_IN_SIGTRAMP (pc
, name
))
44 alpha_osf1_pc_in_sigtramp (CORE_ADDR pc
, char *func_name
)
46 return (func_name
!= NULL
&& strcmp ("__sigtramp", func_name
) == 0);
50 alpha_osf1_sigcontext_addr (struct frame_info
*frame
)
52 return (read_memory_integer (frame
->next
? frame
->next
->frame
56 /* This is the definition of CALL_DUMMY_ADDRESS. It's a heuristic that is used
57 to find a convenient place in the text segment to stick a breakpoint to
58 detect the completion of a target function call (ala call_function_by_hand).
62 alpha_call_dummy_address (void)
65 struct minimal_symbol
*sym
;
67 entry
= entry_point_address ();
72 sym
= lookup_minimal_symbol ("_Prelude", NULL
, symfile_objfile
);
74 if (!sym
|| MSYMBOL_TYPE (sym
) != mst_text
)
77 return SYMBOL_VALUE_ADDRESS (sym
) + 4;
81 alpha_osf1_init_abi (struct gdbarch_info info
,
82 struct gdbarch
*gdbarch
)
84 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
86 set_gdbarch_pc_in_sigtramp (gdbarch
, alpha_osf1_pc_in_sigtramp
);
87 /* The next/step support via procfs on OSF1 is broken when running
88 on multi-processor machines. We need to use software single stepping
90 set_gdbarch_software_single_step (gdbarch
, alpha_software_single_step
);
92 /* Alpha OSF/1 inhibits execution of code on the stack. But there is
93 no need for a dummy on the Alpha. PUSH_ARGUMENTS takes care of all
94 argument handling and bp_call_dummy takes care of stopping the dummy. */
95 set_gdbarch_call_dummy_address (gdbarch
, alpha_call_dummy_address
);
97 tdep
->skip_sigtramp_frame
= alpha_osf1_skip_sigtramp_frame
;
98 tdep
->sigcontext_addr
= alpha_osf1_sigcontext_addr
;
101 tdep
->jb_elt_size
= 8;
105 _initialize_alpha_osf1_tdep (void)
107 gdbarch_register_osabi (bfd_arch_alpha
, 0, GDB_OSABI_OSF1
,
108 alpha_osf1_init_abi
);