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2 | /* i370-dis.c -- Disassemble Instruction 370 (ESA/390) instructions | |
3 | Copyright 1994, 2000 Free Software Foundation, Inc. | |
4 | PowerPC version written by Ian Lance Taylor, Cygnus Support | |
5 | Rewritten for i370 ESA/390 support by Linas Vepstas <linas@linas.org> | |
6 | ||
7 | This file is part of GDB, GAS, and the GNU binutils. | |
8 | ||
9 | GDB, GAS, and the GNU binutils are free software; you can redistribute | |
10 | them and/or modify them under the terms of the GNU General Public | |
11 | License as published by the Free Software Foundation; either version | |
12 | 2, or (at your option) any later version. | |
13 | ||
14 | GDB, GAS, and the GNU binutils are distributed in the hope that they | |
15 | will be useful, but WITHOUT ANY WARRANTY; without even the implied | |
16 | warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
17 | the GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this file; see the file COPYING. If not, write to the Free | |
21 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include <stdio.h> | |
24 | #include "ansidecl.h" | |
25 | #include "sysdep.h" | |
26 | #include "dis-asm.h" | |
27 | #include "opcode/i370.h" | |
28 | ||
29 | /* This file provides several disassembler functions, all of which use | |
30 | the disassembler interface defined in dis-asm.h. | |
31 | */ | |
32 | ||
33 | int | |
34 | print_insn_i370 (memaddr, info) | |
35 | bfd_vma memaddr; | |
36 | struct disassemble_info *info; | |
37 | { | |
38 | bfd_byte buffer[8]; | |
39 | int status; | |
40 | i370_insn_t insn; | |
41 | const struct i370_opcode *opcode; | |
42 | const struct i370_opcode *opcode_end; | |
43 | ||
44 | status = (*info->read_memory_func) (memaddr, buffer, 6, info); | |
45 | if (status != 0) | |
46 | { | |
47 | (*info->memory_error_func) (status, memaddr, info); | |
48 | return -1; | |
49 | } | |
50 | ||
51 | /* Cast the bytes into the insn (in a host-endian indep way) */ | |
52 | insn.i[0] = (buffer[0] << 24) & 0xff000000; | |
53 | insn.i[0] |= (buffer[1] << 16) & 0xff0000; | |
54 | insn.i[0] |= (buffer[2] << 8) & 0xff00; | |
55 | insn.i[0] |= buffer[3] & 0xff; | |
56 | insn.i[1] = (buffer[4] << 24) & 0xff000000; | |
57 | insn.i[1] |= (buffer[5] << 16) & 0xff0000; | |
58 | ||
59 | /* Find the first match in the opcode table. We could speed this up | |
60 | a bit by doing a binary search on the major opcode. */ | |
61 | opcode_end = i370_opcodes + i370_num_opcodes; | |
62 | for (opcode = i370_opcodes; opcode < opcode_end; opcode++) | |
63 | { | |
64 | const unsigned char *opindex; | |
65 | const struct i370_operand *operand; | |
66 | i370_insn_t masked; | |
67 | int invalid; | |
68 | ||
69 | /* Mask off operands, and look for a match ... */ | |
70 | masked = insn; | |
71 | if (2 == opcode->len) | |
72 | { | |
73 | masked.i[0] >>= 16; | |
74 | masked.i[0] &= 0xffff; | |
75 | } | |
76 | masked.i[0] &= opcode->mask.i[0]; | |
77 | if (masked.i[0] != opcode->opcode.i[0]) continue; | |
78 | ||
79 | if (6 == opcode->len) | |
80 | { | |
81 | masked.i[1] &= opcode->mask.i[1]; | |
82 | if (masked.i[1] != opcode->opcode.i[1]) continue; | |
83 | } | |
84 | ||
85 | /* Found a match. adjust a tad */ | |
86 | if (2 == opcode->len) | |
87 | { | |
88 | insn.i[0] >>= 16; | |
89 | insn.i[0] &= 0xffff; | |
90 | } | |
91 | ||
92 | /* Make two passes over the operands. First see if any of them | |
93 | have extraction functions, and, if they do, make sure the | |
94 | instruction is valid. */ | |
95 | invalid = 0; | |
96 | for (opindex = opcode->operands; *opindex != 0; opindex++) | |
97 | { | |
98 | operand = i370_operands + *opindex; | |
99 | if (operand->extract) | |
100 | (*operand->extract) (insn, &invalid); | |
101 | } | |
102 | if (invalid) continue; | |
103 | ||
104 | /* The instruction is valid. */ | |
105 | (*info->fprintf_func) (info->stream, "%s", opcode->name); | |
106 | if (opcode->operands[0] != 0) | |
107 | (*info->fprintf_func) (info->stream, "\t"); | |
108 | ||
109 | /* Now extract and print the operands. */ | |
110 | for (opindex = opcode->operands; *opindex != 0; opindex++) | |
111 | { | |
112 | long value; | |
113 | ||
114 | operand = i370_operands + *opindex; | |
115 | ||
116 | /* Extract the value from the instruction. */ | |
117 | if (operand->extract) | |
118 | value = (*operand->extract) (insn, (int *) NULL); | |
119 | else | |
120 | { | |
121 | value = (insn.i[0] >> operand->shift) & ((1 << operand->bits) - 1); | |
122 | } | |
123 | ||
124 | /* Print the operand as directed by the flags. */ | |
125 | if ((operand->flags & I370_OPERAND_OPTIONAL) != 0) | |
126 | { | |
127 | if (value) | |
128 | (*info->fprintf_func) (info->stream, "(r%ld)", value); | |
129 | } | |
130 | else if ((operand->flags & I370_OPERAND_SBASE) != 0) | |
131 | { | |
132 | (*info->fprintf_func) (info->stream, "(r%ld)", value); | |
133 | } | |
134 | else if ((operand->flags & I370_OPERAND_INDEX) != 0) | |
135 | { | |
136 | if (value) | |
137 | (*info->fprintf_func) (info->stream, "(r%ld,", value); | |
138 | else | |
139 | (*info->fprintf_func) (info->stream, "(,"); | |
140 | } | |
141 | else if ((operand->flags & I370_OPERAND_LENGTH) != 0) | |
142 | { | |
143 | (*info->fprintf_func) (info->stream, "(%ld,", value); | |
144 | } | |
145 | else if ((operand->flags & I370_OPERAND_BASE) != 0) | |
146 | (*info->fprintf_func) (info->stream, "r%ld)", value); | |
147 | else if ((operand->flags & I370_OPERAND_GPR) != 0) | |
148 | (*info->fprintf_func) (info->stream, "r%ld,", value); | |
149 | else if ((operand->flags & I370_OPERAND_FPR) != 0) | |
150 | (*info->fprintf_func) (info->stream, "f%ld,", value); | |
151 | else if ((operand->flags & I370_OPERAND_RELATIVE) != 0) | |
152 | (*info->fprintf_func) (info->stream, "%ld", value); | |
153 | else | |
154 | (*info->fprintf_func) (info->stream, " %ld, ", value); | |
155 | ||
156 | } | |
157 | ||
158 | return opcode->len; | |
159 | ||
160 | } | |
161 | ||
162 | ||
163 | /* We could not find a match. */ | |
164 | (*info->fprintf_func) (info->stream, ".short 0x%02x%02x", buffer[0], buffer[1]); | |
165 | ||
166 | return 2; | |
167 | } |