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5b93d8bb | 1 | /* i370-dis.c -- Disassemble Instruction 370 (ESA/390) instructions |
26ca5450 | 2 | Copyright 1994, 2000, 2003 Free Software Foundation, Inc. |
5b93d8bb AM |
3 | PowerPC version written by Ian Lance Taylor, Cygnus Support |
4 | Rewritten for i370 ESA/390 support by Linas Vepstas <[email protected]> | |
5 | ||
6 | This file is part of GDB, GAS, and the GNU binutils. | |
7 | ||
8 | GDB, GAS, and the GNU binutils are free software; you can redistribute | |
9 | them and/or modify them under the terms of the GNU General Public | |
10 | License as published by the Free Software Foundation; either version | |
11 | 2, or (at your option) any later version. | |
12 | ||
13 | GDB, GAS, and the GNU binutils are distributed in the hope that they | |
14 | will be useful, but WITHOUT ANY WARRANTY; without even the implied | |
15 | warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
16 | the GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this file; see the file COPYING. If not, write to the Free | |
f4321104 | 20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
5b93d8bb AM |
21 | |
22 | #include <stdio.h> | |
5b93d8bb AM |
23 | #include "sysdep.h" |
24 | #include "dis-asm.h" | |
25 | #include "opcode/i370.h" | |
26 | ||
27 | /* This file provides several disassembler functions, all of which use | |
28 | the disassembler interface defined in dis-asm.h. | |
29 | */ | |
30 | ||
31 | int | |
26ca5450 | 32 | print_insn_i370 (bfd_vma memaddr, struct disassemble_info *info) |
5b93d8bb AM |
33 | { |
34 | bfd_byte buffer[8]; | |
35 | int status; | |
36 | i370_insn_t insn; | |
37 | const struct i370_opcode *opcode; | |
38 | const struct i370_opcode *opcode_end; | |
39 | ||
40 | status = (*info->read_memory_func) (memaddr, buffer, 6, info); | |
41 | if (status != 0) | |
42 | { | |
43 | (*info->memory_error_func) (status, memaddr, info); | |
44 | return -1; | |
45 | } | |
46 | ||
47 | /* Cast the bytes into the insn (in a host-endian indep way) */ | |
48 | insn.i[0] = (buffer[0] << 24) & 0xff000000; | |
49 | insn.i[0] |= (buffer[1] << 16) & 0xff0000; | |
50 | insn.i[0] |= (buffer[2] << 8) & 0xff00; | |
51 | insn.i[0] |= buffer[3] & 0xff; | |
52 | insn.i[1] = (buffer[4] << 24) & 0xff000000; | |
53 | insn.i[1] |= (buffer[5] << 16) & 0xff0000; | |
54 | ||
55 | /* Find the first match in the opcode table. We could speed this up | |
56 | a bit by doing a binary search on the major opcode. */ | |
57 | opcode_end = i370_opcodes + i370_num_opcodes; | |
58 | for (opcode = i370_opcodes; opcode < opcode_end; opcode++) | |
59 | { | |
60 | const unsigned char *opindex; | |
61 | const struct i370_operand *operand; | |
62 | i370_insn_t masked; | |
63 | int invalid; | |
64 | ||
65 | /* Mask off operands, and look for a match ... */ | |
66 | masked = insn; | |
67 | if (2 == opcode->len) | |
68 | { | |
69 | masked.i[0] >>= 16; | |
70 | masked.i[0] &= 0xffff; | |
71 | } | |
72 | masked.i[0] &= opcode->mask.i[0]; | |
73 | if (masked.i[0] != opcode->opcode.i[0]) continue; | |
74 | ||
75 | if (6 == opcode->len) | |
76 | { | |
77 | masked.i[1] &= opcode->mask.i[1]; | |
78 | if (masked.i[1] != opcode->opcode.i[1]) continue; | |
79 | } | |
80 | ||
81 | /* Found a match. adjust a tad */ | |
82 | if (2 == opcode->len) | |
83 | { | |
84 | insn.i[0] >>= 16; | |
85 | insn.i[0] &= 0xffff; | |
86 | } | |
87 | ||
88 | /* Make two passes over the operands. First see if any of them | |
89 | have extraction functions, and, if they do, make sure the | |
90 | instruction is valid. */ | |
91 | invalid = 0; | |
92 | for (opindex = opcode->operands; *opindex != 0; opindex++) | |
93 | { | |
94 | operand = i370_operands + *opindex; | |
95 | if (operand->extract) | |
96 | (*operand->extract) (insn, &invalid); | |
97 | } | |
98 | if (invalid) continue; | |
99 | ||
100 | /* The instruction is valid. */ | |
101 | (*info->fprintf_func) (info->stream, "%s", opcode->name); | |
102 | if (opcode->operands[0] != 0) | |
103 | (*info->fprintf_func) (info->stream, "\t"); | |
104 | ||
105 | /* Now extract and print the operands. */ | |
106 | for (opindex = opcode->operands; *opindex != 0; opindex++) | |
107 | { | |
108 | long value; | |
109 | ||
110 | operand = i370_operands + *opindex; | |
111 | ||
112 | /* Extract the value from the instruction. */ | |
113 | if (operand->extract) | |
114 | value = (*operand->extract) (insn, (int *) NULL); | |
115 | else | |
116 | { | |
117 | value = (insn.i[0] >> operand->shift) & ((1 << operand->bits) - 1); | |
118 | } | |
119 | ||
120 | /* Print the operand as directed by the flags. */ | |
121 | if ((operand->flags & I370_OPERAND_OPTIONAL) != 0) | |
122 | { | |
123 | if (value) | |
124 | (*info->fprintf_func) (info->stream, "(r%ld)", value); | |
125 | } | |
126 | else if ((operand->flags & I370_OPERAND_SBASE) != 0) | |
127 | { | |
128 | (*info->fprintf_func) (info->stream, "(r%ld)", value); | |
129 | } | |
130 | else if ((operand->flags & I370_OPERAND_INDEX) != 0) | |
131 | { | |
132 | if (value) | |
133 | (*info->fprintf_func) (info->stream, "(r%ld,", value); | |
134 | else | |
135 | (*info->fprintf_func) (info->stream, "(,"); | |
136 | } | |
137 | else if ((operand->flags & I370_OPERAND_LENGTH) != 0) | |
138 | { | |
139 | (*info->fprintf_func) (info->stream, "(%ld,", value); | |
140 | } | |
141 | else if ((operand->flags & I370_OPERAND_BASE) != 0) | |
142 | (*info->fprintf_func) (info->stream, "r%ld)", value); | |
143 | else if ((operand->flags & I370_OPERAND_GPR) != 0) | |
144 | (*info->fprintf_func) (info->stream, "r%ld,", value); | |
145 | else if ((operand->flags & I370_OPERAND_FPR) != 0) | |
146 | (*info->fprintf_func) (info->stream, "f%ld,", value); | |
147 | else if ((operand->flags & I370_OPERAND_RELATIVE) != 0) | |
148 | (*info->fprintf_func) (info->stream, "%ld", value); | |
149 | else | |
150 | (*info->fprintf_func) (info->stream, " %ld, ", value); | |
151 | ||
152 | } | |
153 | ||
154 | return opcode->len; | |
155 | ||
156 | } | |
157 | ||
158 | ||
159 | /* We could not find a match. */ | |
160 | (*info->fprintf_func) (info->stream, ".short 0x%02x%02x", buffer[0], buffer[1]); | |
161 | ||
162 | return 2; | |
163 | } |