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" |
36a6271d JT |
27 | |
28 | #include "alpha-tdep.h" | |
29 | ||
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. */ | |
32 | static CORE_ADDR | |
33 | alpha_osf1_skip_sigtramp_frame (struct frame_info *frame, CORE_ADDR pc) | |
34 | { | |
35 | char *name; | |
36 | ||
37 | find_pc_partial_function (pc, &name, (CORE_ADDR *) NULL, (CORE_ADDR *) NULL); | |
38 | if (PC_IN_SIGTRAMP (pc, name)) | |
39 | return frame->frame; | |
40 | return 0; | |
41 | } | |
42 | ||
6c72f9f9 JT |
43 | static int |
44 | alpha_osf1_pc_in_sigtramp (CORE_ADDR pc, char *func_name) | |
45 | { | |
bde58177 | 46 | return (func_name != NULL && strcmp ("__sigtramp", func_name) == 0); |
6c72f9f9 JT |
47 | } |
48 | ||
5868c862 JT |
49 | static CORE_ADDR |
50 | alpha_osf1_sigcontext_addr (struct frame_info *frame) | |
51 | { | |
52 | return (read_memory_integer (frame->next ? frame->next->frame | |
53 | : frame->frame, 8)); | |
54 | } | |
55 | ||
d2427a71 RH |
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). | |
59 | */ | |
60 | ||
61 | static CORE_ADDR | |
62 | alpha_call_dummy_address (void) | |
63 | { | |
64 | CORE_ADDR entry; | |
65 | struct minimal_symbol *sym; | |
66 | ||
67 | entry = entry_point_address (); | |
68 | ||
69 | if (entry != 0) | |
70 | return entry; | |
71 | ||
72 | sym = lookup_minimal_symbol ("_Prelude", NULL, symfile_objfile); | |
73 | ||
74 | if (!sym || MSYMBOL_TYPE (sym) != mst_text) | |
75 | return 0; | |
76 | else | |
77 | return SYMBOL_VALUE_ADDRESS (sym) + 4; | |
78 | } | |
79 | ||
36a6271d JT |
80 | static void |
81 | alpha_osf1_init_abi (struct gdbarch_info info, | |
82 | struct gdbarch *gdbarch) | |
83 | { | |
84 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
85 | ||
6c72f9f9 | 86 | set_gdbarch_pc_in_sigtramp (gdbarch, alpha_osf1_pc_in_sigtramp); |
c8edd8b4 JB |
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 | |
89 | instead. */ | |
90 | set_gdbarch_software_single_step (gdbarch, alpha_software_single_step); | |
6c72f9f9 | 91 | |
d2427a71 RH |
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); | |
96 | ||
36a6271d | 97 | tdep->skip_sigtramp_frame = alpha_osf1_skip_sigtramp_frame; |
5868c862 | 98 | tdep->sigcontext_addr = alpha_osf1_sigcontext_addr; |
accc6d1f JT |
99 | |
100 | tdep->jb_pc = 2; | |
101 | tdep->jb_elt_size = 8; | |
36a6271d JT |
102 | } |
103 | ||
104 | void | |
105 | _initialize_alpha_osf1_tdep (void) | |
106 | { | |
05816f70 MK |
107 | gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OSF1, |
108 | alpha_osf1_init_abi); | |
36a6271d | 109 | } |