| 1 | /* Parameters for execution on a Sony/NEWS, for GDB, the GNU debugger. |
| 2 | Copyright (C) 1987, 1989, 1991 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 | /* See following cpu type determination macro to get the machine type. |
| 21 | |
| 22 | Here is an m-news.h file for gdb. It supports the 68881 registers. |
| 23 | by hikichi@srava.sra.junet |
| 24 | |
| 25 | * Support Sun assembly format instead of Motorola one. |
| 26 | * Ptrace for handling floating register has a bug(before NEWS OS version 2.2), |
| 27 | * After NEWS OS version 3.2, some of ptrace's bug is fixed. |
| 28 | But we cannot change the floating register(see adb(1) in OS 3.2) yet. */ |
| 29 | |
| 30 | #define HAVE_68881 |
| 31 | |
| 32 | /* Define this if the C compiler puts an underscore at the front |
| 33 | of external names before giving them to the linker. */ |
| 34 | |
| 35 | #define NAMES_HAVE_UNDERSCORE |
| 36 | |
| 37 | /* Use to compute STACK_END_ADDR. */ |
| 38 | #define TARGET_UPAGES 2 |
| 39 | #define TARGET_NBPG 4096 |
| 40 | |
| 41 | /* Address of end of stack space. */ |
| 42 | |
| 43 | #define STACK_END_ADDR (0x80000000 - TARGET_UPAGES * TARGET_NBPG) |
| 44 | |
| 45 | /* Extract from an array REGBUF containing the (raw) register state |
| 46 | a function return value of type TYPE, and copy that, in virtual format, |
| 47 | into VALBUF. */ |
| 48 | |
| 49 | /* when it return the floating value, use the FP0 in NEWS. */ |
| 50 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ |
| 51 | { if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \ |
| 52 | { \ |
| 53 | REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM, \ |
| 54 | ®BUF[REGISTER_BYTE (FP0_REGNUM)], VALBUF); \ |
| 55 | } \ |
| 56 | else \ |
| 57 | bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE)); } |
| 58 | |
| 59 | /* Write into appropriate registers a function return value |
| 60 | of type TYPE, given in virtual format. */ |
| 61 | |
| 62 | /* when it return the floating value, use the FP0 in NEWS. */ |
| 63 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ |
| 64 | { if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \ |
| 65 | { \ |
| 66 | char raw_buf[REGISTER_RAW_SIZE (FP0_REGNUM)]; \ |
| 67 | REGISTER_CONVERT_TO_RAW (FP0_REGNUM, VALBUF, raw_buf); \ |
| 68 | write_register_bytes (FP0_REGNUM, \ |
| 69 | raw_buf, REGISTER_RAW_SIZE (FP0_REGNUM)); \ |
| 70 | } \ |
| 71 | else \ |
| 72 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)); } |
| 73 | |
| 74 | /* Return number of args passed to a frame. |
| 75 | Can return -1, meaning no way to tell. */ |
| 76 | |
| 77 | #define FRAME_NUM_ARGS(val, fi) \ |
| 78 | { register CORE_ADDR pc = FRAME_SAVED_PC (fi); \ |
| 79 | register int insn = 0177777 & read_memory_integer (pc, 2); \ |
| 80 | val = 0; \ |
| 81 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ \ |
| 82 | val = read_memory_integer (pc + 2, 2); \ |
| 83 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ \ |
| 84 | || (insn & 0170777) == 0050117) /* addqw */ \ |
| 85 | { val = (insn >> 9) & 7; if (val == 0) val = 8; } \ |
| 86 | else if (insn == 0157774) /* addal #WW, sp */ \ |
| 87 | val = read_memory_integer (pc + 2, 4); \ |
| 88 | val >>= 2; } |
| 89 | |
| 90 | #include "tm-68k.h" |