| 1 | /* Common definitions to make GDB run on Vaxen under 4.2bsd and Ultrix. |
| 2 | Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc. |
| 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #define HOST_BYTE_ORDER LITTLE_ENDIAN |
| 21 | |
| 22 | /* Get rid of any system-imposed stack limit if possible. */ |
| 23 | |
| 24 | #define SET_STACK_LIMIT_HUGE |
| 25 | |
| 26 | /* This is the amount to subtract from u.u_ar0 |
| 27 | to get the offset in the core file of the register values. */ |
| 28 | |
| 29 | #define KERNEL_U_ADDR (0x80000000 - (UPAGES * NBPG)) |
| 30 | |
| 31 | #define REGISTER_U_ADDR(addr, blockend, regno) \ |
| 32 | { addr = blockend - 0110 + regno * 4; \ |
| 33 | if (regno == PC_REGNUM) addr = blockend - 8; \ |
| 34 | if (regno == PS_REGNUM) addr = blockend - 4; \ |
| 35 | if (regno == FP_REGNUM) addr = blockend - 0120; \ |
| 36 | if (regno == AP_REGNUM) addr = blockend - 0124; \ |
| 37 | if (regno == SP_REGNUM) addr = blockend - 20; } |
| 38 | |
| 39 | /* Kernel is a bit tenacious about sharing text segments, disallowing bpts. */ |
| 40 | #define ONE_PROCESS_WRITETEXT |
| 41 | |
| 42 | /* Interface definitions for kernel debugger KDB. */ |
| 43 | |
| 44 | /* Map machine fault codes into signal numbers. |
| 45 | First subtract 0, divide by 4, then index in a table. |
| 46 | Faults for which the entry in this table is 0 |
| 47 | are not handled by KDB; the program's own trap handler |
| 48 | gets to handle then. */ |
| 49 | |
| 50 | #define FAULT_CODE_ORIGIN 0 |
| 51 | #define FAULT_CODE_UNITS 4 |
| 52 | #define FAULT_TABLE \ |
| 53 | { 0, SIGKILL, SIGSEGV, 0, 0, 0, 0, 0, \ |
| 54 | 0, 0, SIGTRAP, SIGTRAP, 0, 0, 0, 0, \ |
| 55 | 0, 0, 0, 0, 0, 0, 0, 0} |
| 56 | |
| 57 | /* Start running with a stack stretching from BEG to END. |
| 58 | BEG and END should be symbols meaningful to the assembler. |
| 59 | This is used only for kdb. */ |
| 60 | |
| 61 | #define INIT_STACK(beg, end) \ |
| 62 | { asm (".globl end"); \ |
| 63 | asm ("movl $ end, sp"); \ |
| 64 | asm ("clrl fp"); } |
| 65 | |
| 66 | /* Push the frame pointer register on the stack. */ |
| 67 | #define PUSH_FRAME_PTR \ |
| 68 | asm ("pushl fp"); |
| 69 | |
| 70 | /* Copy the top-of-stack to the frame pointer register. */ |
| 71 | #define POP_FRAME_PTR \ |
| 72 | asm ("movl (sp), fp"); |
| 73 | |
| 74 | /* After KDB is entered by a fault, push all registers |
| 75 | that GDB thinks about (all NUM_REGS of them), |
| 76 | so that they appear in order of ascending GDB register number. |
| 77 | The fault code will be on the stack beyond the last register. */ |
| 78 | |
| 79 | #define PUSH_REGISTERS \ |
| 80 | { asm ("pushl 8(sp)"); \ |
| 81 | asm ("pushl 8(sp)"); \ |
| 82 | asm ("pushal 0x14(sp)"); \ |
| 83 | asm ("pushr $037777"); } |
| 84 | |
| 85 | /* Assuming the registers (including processor status) have been |
| 86 | pushed on the stack in order of ascending GDB register number, |
| 87 | restore them and return to the address in the saved PC register. */ |
| 88 | |
| 89 | #define POP_REGISTERS \ |
| 90 | { asm ("popr $037777"); \ |
| 91 | asm ("subl2 $8,(sp)"); \ |
| 92 | asm ("movl (sp),sp"); \ |
| 93 | asm ("rei"); } |