| 1 | /* Print NS 32000 instructions for GDB, the GNU debugger. |
| 2 | Copyright 1986, 1988, 1991, 1992, 1994, 1995 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 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. |
| 11 | |
| 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. |
| 16 | |
| 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, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | |
| 23 | void |
| 24 | _initialize_ns32k_tdep () |
| 25 | { |
| 26 | tm_print_insn = print_insn_ns32k; |
| 27 | } |
| 28 | |
| 29 | sign_extend (value, bits) |
| 30 | { |
| 31 | value = value & ((1 << bits) - 1); |
| 32 | return (value & (1 << (bits-1)) |
| 33 | ? value | (~((1 << bits) - 1)) |
| 34 | : value); |
| 35 | } |
| 36 | |
| 37 | void |
| 38 | flip_bytes (ptr, count) |
| 39 | char *ptr; |
| 40 | int count; |
| 41 | { |
| 42 | char tmp; |
| 43 | |
| 44 | while (count > 0) |
| 45 | { |
| 46 | tmp = *ptr; |
| 47 | ptr[0] = ptr[count-1]; |
| 48 | ptr[count-1] = tmp; |
| 49 | ptr++; |
| 50 | count -= 2; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | /* Return the number of locals in the current frame given a pc |
| 55 | pointing to the enter instruction. This is used in the macro |
| 56 | FRAME_FIND_SAVED_REGS. */ |
| 57 | |
| 58 | int |
| 59 | ns32k_localcount (enter_pc) |
| 60 | CORE_ADDR enter_pc; |
| 61 | { |
| 62 | unsigned char localtype; |
| 63 | int localcount; |
| 64 | |
| 65 | localtype = read_memory_integer (enter_pc+2, 1); |
| 66 | if ((localtype & 0x80) == 0) |
| 67 | localcount = localtype; |
| 68 | else if ((localtype & 0xc0) == 0x80) |
| 69 | localcount = (((localtype & 0x3f) << 8) |
| 70 | | (read_memory_integer (enter_pc+3, 1) & 0xff)); |
| 71 | else |
| 72 | localcount = (((localtype & 0x3f) << 24) |
| 73 | | ((read_memory_integer (enter_pc+3, 1) & 0xff) << 16) |
| 74 | | ((read_memory_integer (enter_pc+4, 1) & 0xff) << 8 ) |
| 75 | | (read_memory_integer (enter_pc+5, 1) & 0xff)); |
| 76 | return localcount; |
| 77 | } |
| 78 | |
| 79 | /* |
| 80 | * Get the address of the enter opcode for the function |
| 81 | * containing PC, if there is an enter for the function, |
| 82 | * and if the pc is between the enter and exit. |
| 83 | * Returns positive address if pc is between enter/exit, |
| 84 | * 1 if pc before enter or after exit, 0 otherwise. |
| 85 | */ |
| 86 | |
| 87 | CORE_ADDR |
| 88 | ns32k_get_enter_addr (pc) |
| 89 | CORE_ADDR pc; |
| 90 | { |
| 91 | CORE_ADDR enter_addr; |
| 92 | unsigned char op; |
| 93 | |
| 94 | if (pc == 0) |
| 95 | return 0; |
| 96 | |
| 97 | if (ABOUT_TO_RETURN (pc)) |
| 98 | return 1; /* after exit */ |
| 99 | |
| 100 | enter_addr = get_pc_function_start (pc); |
| 101 | |
| 102 | if (pc == enter_addr) |
| 103 | return 1; /* before enter */ |
| 104 | |
| 105 | op = read_memory_integer (enter_addr, 1); |
| 106 | |
| 107 | if (op != 0x82) |
| 108 | return 0; /* function has no enter/exit */ |
| 109 | |
| 110 | return enter_addr; /* pc is between enter and exit */ |
| 111 | } |