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c906108c SS |
1 | /* Common definitions to make GDB run on Vaxen under 4.2bsd and Ultrix. |
2 | Copyright (C) 1986, 1987, 1989, 1992 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 | #define HOST_BYTE_ORDER LITTLE_ENDIAN | |
22 | ||
23 | /* This is the amount to subtract from u.u_ar0 | |
24 | to get the offset in the core file of the register values. */ | |
25 | ||
26 | #define KERNEL_U_ADDR (0x80000000 - (UPAGES * NBPG)) | |
27 | ||
28 | /* Kernel is a bit tenacious about sharing text segments, disallowing bpts. */ | |
29 | #define ONE_PROCESS_WRITETEXT | |
30 | ||
31 | /* Interface definitions for kernel debugger KDB. */ | |
32 | ||
33 | /* Map machine fault codes into signal numbers. | |
34 | First subtract 0, divide by 4, then index in a table. | |
35 | Faults for which the entry in this table is 0 | |
36 | are not handled by KDB; the program's own trap handler | |
37 | gets to handle then. */ | |
38 | ||
39 | #define FAULT_CODE_ORIGIN 0 | |
40 | #define FAULT_CODE_UNITS 4 | |
41 | #define FAULT_TABLE \ | |
42 | { 0, SIGKILL, SIGSEGV, 0, 0, 0, 0, 0, \ | |
43 | 0, 0, SIGTRAP, SIGTRAP, 0, 0, 0, 0, \ | |
44 | 0, 0, 0, 0, 0, 0, 0, 0} | |
45 | ||
46 | /* Start running with a stack stretching from BEG to END. | |
47 | BEG and END should be symbols meaningful to the assembler. | |
48 | This is used only for kdb. */ | |
49 | ||
50 | #define INIT_STACK(beg, end) \ | |
51 | { asm (".globl end"); \ | |
52 | asm ("movl $ end, sp"); \ | |
53 | asm ("clrl fp"); } | |
54 | ||
55 | /* Push the frame pointer register on the stack. */ | |
56 | #define PUSH_FRAME_PTR \ | |
57 | asm ("pushl fp"); | |
58 | ||
59 | /* Copy the top-of-stack to the frame pointer register. */ | |
60 | #define POP_FRAME_PTR \ | |
61 | asm ("movl (sp), fp"); | |
62 | ||
63 | /* After KDB is entered by a fault, push all registers | |
64 | that GDB thinks about (all NUM_REGS of them), | |
65 | so that they appear in order of ascending GDB register number. | |
66 | The fault code will be on the stack beyond the last register. */ | |
67 | ||
68 | #define PUSH_REGISTERS \ | |
69 | { asm ("pushl 8(sp)"); \ | |
70 | asm ("pushl 8(sp)"); \ | |
71 | asm ("pushal 0x14(sp)"); \ | |
72 | asm ("pushr $037777"); } | |
73 | ||
74 | /* Assuming the registers (including processor status) have been | |
75 | pushed on the stack in order of ascending GDB register number, | |
76 | restore them and return to the address in the saved PC register. */ | |
77 | ||
78 | #define POP_REGISTERS \ | |
79 | { asm ("popr $037777"); \ | |
80 | asm ("subl2 $8,(sp)"); \ | |
81 | asm ("movl (sp),sp"); \ | |
82 | asm ("rei"); } |