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dd3b648e RP |
1 | /* Macro defintions for i386. |
2 | Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
99a7de40 | 6 | This program is free software; you can redistribute it and/or modify |
dd3b648e | 7 | it under the terms of the GNU General Public License as published by |
99a7de40 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
dd3b648e | 10 | |
99a7de40 | 11 | This program is distributed in the hope that it will be useful, |
dd3b648e RP |
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 | |
99a7de40 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
dd3b648e RP |
19 | |
20 | /* | |
21 | * Changes for 80386 by Pace Willisson (pace@prep.ai.mit.edu) | |
22 | * July 1988 | |
23 | */ | |
24 | ||
25 | #define HOST_BYTE_ORDER LITTLE_ENDIAN | |
26 | ||
27 | /* I'm running gdb 3.4 under 386/ix 2.0.2, which is a derivative of AT&T's | |
28 | Sys V/386 3.2. | |
29 | ||
30 | On some machines, gdb crashes when it's starting up while calling the | |
31 | vendor's termio tgetent() routine. It always works when run under | |
32 | itself (actually, under 3.2, it's not an infinitely recursive bug.) | |
33 | After some poking around, it appears that depending on the environment | |
34 | size, or whether you're running YP, or the phase of the moon or something, | |
35 | the stack is not always long-aligned when main() is called, and tgetent() | |
36 | takes strong offense at that. On some machines this bug never appears, but | |
37 | on those where it does, it occurs quite reliably. */ | |
38 | #define ALIGN_STACK_ON_STARTUP | |
39 | ||
40 | /* define USG if you are using sys5 /usr/include's */ | |
41 | #define USG | |
42 | ||
43 | /* USG systems need these */ | |
44 | #define vfork() fork() | |
45 | #define MAXPATHLEN 500 | |
46 | ||
47 | #define HAVE_TERMIO | |
48 | ||
49 | /* Get rid of any system-imposed stack limit if possible. */ | |
50 | ||
51 | /* #define SET_STACK_LIMIT_HUGE not in sys5 */ | |
52 | ||
53 | /* This is the amount to subtract from u.u_ar0 | |
54 | to get the offset in the core file of the register values. */ | |
55 | ||
56 | #define KERNEL_U_ADDR 0xe0000000 | |
57 | ||
58 | \f | |
59 | #if 0 | |
60 | /* Interface definitions for kernel debugger KDB. */ | |
61 | ||
62 | /* Map machine fault codes into signal numbers. | |
63 | First subtract 0, divide by 4, then index in a table. | |
64 | Faults for which the entry in this table is 0 | |
65 | are not handled by KDB; the program's own trap handler | |
66 | gets to handle then. */ | |
67 | ||
68 | #define FAULT_CODE_ORIGIN 0 | |
69 | #define FAULT_CODE_UNITS 4 | |
70 | #define FAULT_TABLE \ | |
71 | { 0, 0, 0, 0, 0, 0, 0, 0, \ | |
72 | 0, 0, 0, 0, 0, 0, 0, 0, \ | |
73 | 0, 0, 0, 0, 0, 0, 0, 0} | |
74 | ||
75 | /* Start running with a stack stretching from BEG to END. | |
76 | BEG and END should be symbols meaningful to the assembler. | |
77 | This is used only for kdb. */ | |
78 | ||
79 | #define INIT_STACK(beg, end) {} | |
80 | ||
81 | /* Push the frame pointer register on the stack. */ | |
82 | #define PUSH_FRAME_PTR {} | |
83 | ||
84 | /* Copy the top-of-stack to the frame pointer register. */ | |
85 | #define POP_FRAME_PTR {} | |
86 | ||
87 | /* After KDB is entered by a fault, push all registers | |
88 | that GDB thinks about (all NUM_REGS of them), | |
89 | so that they appear in order of ascending GDB register number. | |
90 | The fault code will be on the stack beyond the last register. */ | |
91 | ||
92 | #define PUSH_REGISTERS {} | |
93 | ||
94 | /* Assuming the registers (including processor status) have been | |
95 | pushed on the stack in order of ascending GDB register number, | |
96 | restore them and return to the address in the saved PC register. */ | |
97 | ||
98 | #define POP_REGISTERS {} | |
99 | #endif /* 0 */ |