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c906108c SS |
1 | /* Macro definitions for GDB on an Intel i386 running SVR4. |
2 | Copyright (C) 1991, 1994 Free Software Foundation, Inc. | |
3 | Written by Fred Fish at Cygnus Support (fnf@cygnus.com) | |
4 | ||
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | #ifndef TM_I386V4_H | |
23 | #define TM_I386V4_H 1 | |
24 | ||
25 | /* Pick up most of what we need from the generic i386 target include file. */ | |
26 | ||
27 | #include "i386/tm-i386.h" | |
28 | ||
29 | /* Pick up more stuff from the generic SVR4 host include file. */ | |
30 | ||
31 | #include "tm-sysv4.h" | |
32 | ||
33 | /* Use the alternate method of determining valid frame chains. */ | |
34 | ||
35 | #define FRAME_CHAIN_VALID(fp,fi) alternate_frame_chain_valid (fp, fi) | |
36 | ||
37 | /* Offsets (in target ints) into jmp_buf. Not defined in any system header | |
38 | file, so we have to step through setjmp/longjmp with a debugger and figure | |
39 | them out. Note that <setjmp> defines _JBLEN as 10, which is the default | |
40 | if no specific machine is selected, even though we only use 6 slots. */ | |
41 | ||
42 | #define JB_ELEMENT_SIZE sizeof(int) /* jmp_buf[_JBLEN] is array of ints */ | |
43 | ||
44 | #define JB_EBX 0 | |
45 | #define JB_ESI 1 | |
46 | #define JB_EDI 2 | |
47 | #define JB_EBP 3 | |
48 | #define JB_ESP 4 | |
49 | #define JB_EDX 5 | |
50 | ||
c5aa993b | 51 | #define JB_PC JB_EDX /* Setjmp()'s return PC saved in EDX */ |
c906108c SS |
52 | |
53 | /* Figure out where the longjmp will land. Slurp the args out of the stack. | |
54 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
55 | we extract the pc (JB_PC) that we will land at. The pc is copied into ADDR. | |
56 | This routine returns true on success */ | |
57 | ||
58 | extern int | |
59 | get_longjmp_target PARAMS ((CORE_ADDR *)); | |
60 | ||
61 | #define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR) | |
62 | ||
63 | /* The following redefines make backtracing through sigtramp work. | |
64 | They manufacture a fake sigtramp frame and obtain the saved pc in sigtramp | |
65 | from the ucontext structure which is pushed by the kernel on the | |
66 | user stack. Unfortunately there are three variants of sigtramp handlers. */ | |
67 | ||
68 | #define I386V4_SIGTRAMP_SAVED_PC | |
69 | #define IN_SIGTRAMP(pc, name) ((name) \ | |
70 | && (STREQ ("_sigreturn", name) \ | |
71 | || STREQ ("_sigacthandler", name) \ | |
72 | || STREQ ("sigvechandler", name))) | |
73 | ||
74 | /* Saved Pc. Get it from ucontext if within sigtramp. */ | |
75 | ||
76 | #define sigtramp_saved_pc i386v4_sigtramp_saved_pc | |
77 | extern CORE_ADDR i386v4_sigtramp_saved_pc PARAMS ((struct frame_info *)); | |
78 | ||
c5aa993b | 79 | #endif /* ifndef TM_I386V4_H */ |