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c906108c SS |
1 | /* Definitions to target GDB to GNU/Linux on 386. |
2 | Copyright 1992, 1993 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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. */ | |
c906108c SS |
20 | |
21 | #ifndef TM_LINUX_H | |
22 | #define TM_LINUX_H | |
23 | ||
24 | /* FIXME: If nothing else gets added to this file, it could be removed | |
25 | and configure could just use tm-i386.h instead. -fnf */ | |
26 | ||
27 | #include "i386/tm-i386.h" | |
28 | ||
a0b3c4fd JM |
29 | /* Size of sigcontext, from <asm/sigcontext.h>. */ |
30 | #define LINUX_SIGCONTEXT_SIZE (88) | |
31 | ||
32 | /* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */ | |
33 | #define LINUX_SIGCONTEXT_PC_OFFSET (56) | |
34 | ||
35 | /* Offset to saved SP in sigcontext, from <asm/sigcontext.h>. */ | |
36 | #define LINUX_SIGCONTEXT_SP_OFFSET (28) | |
c906108c SS |
37 | |
38 | /* We need this file for the SOLIB_TRAMPOLINE stuff. */ | |
39 | ||
40 | #include "tm-sysv4.h" | |
41 | ||
42 | /* The following works around a problem with /usr/include/sys/procfs.h */ | |
43 | #define sys_quotactl 1 | |
44 | ||
a0b3c4fd JM |
45 | /* When the i386 Linux kernel calls a signal handler, the return |
46 | address points to a bit of code on the stack. These definitions | |
47 | are used to identify this bit of code as a signal trampoline in | |
48 | order to support backtracing through calls to signal handlers. */ | |
49 | ||
50 | #define I386_LINUX_SIGTRAMP | |
51 | #define IN_SIGTRAMP(pc, name) ((name) == NULL && i386_linux_sigtramp (pc)) | |
52 | ||
53 | extern int i386_linux_sigtramp PARAMS ((CORE_ADDR)); | |
54 | ||
55 | /* We need our own version of sigtramp_saved_pc to get the saved PC in | |
56 | a sigtramp routine. */ | |
57 | ||
58 | #define sigtramp_saved_pc i386_linux_sigtramp_saved_pc | |
59 | extern CORE_ADDR i386_linux_sigtramp_saved_pc PARAMS ((struct frame_info *)); | |
60 | ||
61 | /* Signal trampolines don't have a meaningful frame. As in tm-i386.h, | |
62 | the frame pointer value we use is actually the frame pointer of the | |
63 | calling frame--that is, the frame which was in progress when the | |
64 | signal trampoline was entered. gdb mostly treats this frame | |
65 | pointer value as a magic cookie. We detect the case of a signal | |
66 | trampoline by looking at the SIGNAL_HANDLER_CALLER field, which is | |
67 | set based on IN_SIGTRAMP. | |
68 | ||
69 | When a signal trampoline is invoked from a frameless function, we | |
70 | essentially have two frameless functions in a row. In this case, | |
71 | we use the same magic cookie for three frames in a row. We detect | |
72 | this case by seeing whether the next frame has | |
73 | SIGNAL_HANDLER_CALLER set, and, if it does, checking whether the | |
74 | current frame is actually frameless. In this case, we need to get | |
75 | the PC by looking at the SP register value stored in the signal | |
76 | context. | |
77 | ||
78 | This should work in most cases except in horrible situations where | |
79 | a signal occurs just as we enter a function but before the frame | |
80 | has been set up. */ | |
81 | ||
82 | #define FRAMELESS_SIGNAL(FRAME) \ | |
83 | ((FRAME)->next != NULL \ | |
84 | && (FRAME)->next->signal_handler_caller \ | |
85 | && frameless_look_for_prologue (FRAME)) | |
86 | ||
87 | #undef FRAME_CHAIN | |
88 | #define FRAME_CHAIN(FRAME) \ | |
89 | ((FRAME)->signal_handler_caller \ | |
90 | ? (FRAME)->frame \ | |
91 | : (FRAMELESS_SIGNAL (FRAME) \ | |
92 | ? (FRAME)->frame \ | |
93 | : (!inside_entry_file ((FRAME)->pc) \ | |
94 | ? read_memory_integer ((FRAME)->frame, 4) \ | |
95 | : 0))) | |
96 | ||
97 | #undef FRAME_SAVED_PC | |
98 | #define FRAME_SAVED_PC(FRAME) \ | |
99 | ((FRAME)->signal_handler_caller \ | |
100 | ? sigtramp_saved_pc (FRAME) \ | |
101 | : (FRAMELESS_SIGNAL (FRAME) \ | |
102 | ? read_memory_integer (i386_linux_sigtramp_saved_sp ((FRAME)->next), 4) \ | |
103 | : read_memory_integer ((FRAME)->frame + 4, 4))) | |
104 | ||
105 | extern CORE_ADDR i386_linux_sigtramp_saved_sp PARAMS ((struct frame_info *)); | |
106 | ||
c5aa993b | 107 | #endif /* #ifndef TM_LINUX_H */ |