Commit | Line | Data |
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36a6271d | 1 | /* Target-dependent code for OSF/1 on Alpha. |
4be87837 | 2 | Copyright 2002, 2003 Free Software Foundation, Inc. |
36a6271d JT |
3 | |
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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. */ | |
20 | ||
21 | #include "defs.h" | |
22 | #include "frame.h" | |
5868c862 | 23 | #include "gdbcore.h" |
36a6271d | 24 | #include "value.h" |
4be87837 | 25 | #include "osabi.h" |
4c2e2391 | 26 | #include "gdb_string.h" |
9798ab0d | 27 | #include "objfiles.h" |
36a6271d JT |
28 | |
29 | #include "alpha-tdep.h" | |
30 | ||
6c72f9f9 JT |
31 | static int |
32 | alpha_osf1_pc_in_sigtramp (CORE_ADDR pc, char *func_name) | |
33 | { | |
bde58177 | 34 | return (func_name != NULL && strcmp ("__sigtramp", func_name) == 0); |
6c72f9f9 JT |
35 | } |
36 | ||
5868c862 JT |
37 | static CORE_ADDR |
38 | alpha_osf1_sigcontext_addr (struct frame_info *frame) | |
39 | { | |
37bb6d9f JB |
40 | struct frame_info *next_frame = get_next_frame (frame); |
41 | ||
42 | if (next_frame != NULL) | |
43 | return (read_memory_integer (get_frame_base (next_frame), 8)); | |
44 | else | |
45 | return (read_memory_integer (get_frame_base (frame), 8)); | |
5868c862 JT |
46 | } |
47 | ||
d2427a71 RH |
48 | /* This is the definition of CALL_DUMMY_ADDRESS. It's a heuristic that is used |
49 | to find a convenient place in the text segment to stick a breakpoint to | |
50 | detect the completion of a target function call (ala call_function_by_hand). | |
51 | */ | |
52 | ||
53 | static CORE_ADDR | |
54 | alpha_call_dummy_address (void) | |
55 | { | |
56 | CORE_ADDR entry; | |
57 | struct minimal_symbol *sym; | |
58 | ||
59 | entry = entry_point_address (); | |
60 | ||
61 | if (entry != 0) | |
62 | return entry; | |
63 | ||
64 | sym = lookup_minimal_symbol ("_Prelude", NULL, symfile_objfile); | |
65 | ||
66 | if (!sym || MSYMBOL_TYPE (sym) != mst_text) | |
67 | return 0; | |
68 | else | |
69 | return SYMBOL_VALUE_ADDRESS (sym) + 4; | |
70 | } | |
71 | ||
36a6271d JT |
72 | static void |
73 | alpha_osf1_init_abi (struct gdbarch_info info, | |
74 | struct gdbarch *gdbarch) | |
75 | { | |
76 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
77 | ||
0bd79c5c JB |
78 | /* Hook into the MDEBUG frame unwinder. */ |
79 | alpha_mdebug_init_abi (info, gdbarch); | |
80 | ||
6c72f9f9 | 81 | set_gdbarch_pc_in_sigtramp (gdbarch, alpha_osf1_pc_in_sigtramp); |
c8edd8b4 JB |
82 | /* The next/step support via procfs on OSF1 is broken when running |
83 | on multi-processor machines. We need to use software single stepping | |
84 | instead. */ | |
85 | set_gdbarch_software_single_step (gdbarch, alpha_software_single_step); | |
6c72f9f9 | 86 | |
d2427a71 RH |
87 | /* Alpha OSF/1 inhibits execution of code on the stack. But there is |
88 | no need for a dummy on the Alpha. PUSH_ARGUMENTS takes care of all | |
89 | argument handling and bp_call_dummy takes care of stopping the dummy. */ | |
90 | set_gdbarch_call_dummy_address (gdbarch, alpha_call_dummy_address); | |
91 | ||
5868c862 | 92 | tdep->sigcontext_addr = alpha_osf1_sigcontext_addr; |
accc6d1f JT |
93 | |
94 | tdep->jb_pc = 2; | |
95 | tdep->jb_elt_size = 8; | |
36a6271d JT |
96 | } |
97 | ||
98 | void | |
99 | _initialize_alpha_osf1_tdep (void) | |
100 | { | |
05816f70 MK |
101 | gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OSF1, |
102 | alpha_osf1_init_abi); | |
36a6271d | 103 | } |