Commit | Line | Data |
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a85d7ed0 | 1 | /* s390-dis.c -- Disassemble S390 instructions |
4b95cf5c | 2 | Copyright (C) 2000-2014 Free Software Foundation, Inc. |
a85d7ed0 NC |
3 | Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). |
4 | ||
9b201bb5 | 5 | This file is part of the GNU opcodes library. |
a85d7ed0 | 6 | |
9b201bb5 | 7 | This library is free software; you can redistribute it and/or modify |
a85d7ed0 | 8 | it under the terms of the GNU General Public License as published by |
9b201bb5 NC |
9 | the Free Software Foundation; either version 3, or (at your option) |
10 | any later version. | |
a85d7ed0 | 11 | |
9b201bb5 NC |
12 | It is distributed in the hope that it will be useful, but WITHOUT |
13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
15 | License for more details. | |
a85d7ed0 NC |
16 | |
17 | You should have received a copy of the GNU General Public License | |
9b201bb5 NC |
18 | along with this file; see the file COPYING. If not, write to the |
19 | Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, | |
20 | MA 02110-1301, USA. */ | |
a85d7ed0 | 21 | |
df7b86aa | 22 | #include "sysdep.h" |
a85d7ed0 NC |
23 | #include <stdio.h> |
24 | #include "ansidecl.h" | |
a85d7ed0 | 25 | #include "dis-asm.h" |
112b7c50 | 26 | #include "opintl.h" |
a85d7ed0 NC |
27 | #include "opcode/s390.h" |
28 | ||
29 | static int init_flag = 0; | |
30 | static int opc_index[256]; | |
31 | static int current_arch_mask = 0; | |
32 | ||
44f2a95d KH |
33 | /* Set up index table for first opcode byte. */ |
34 | ||
35 | static void | |
47b0e7ad | 36 | init_disasm (struct disassemble_info *info) |
a85d7ed0 NC |
37 | { |
38 | const struct s390_opcode *opcode; | |
39 | const struct s390_opcode *opcode_end; | |
112b7c50 | 40 | const char *p; |
a85d7ed0 | 41 | |
44f2a95d | 42 | memset (opc_index, 0, sizeof (opc_index)); |
a85d7ed0 | 43 | opcode_end = s390_opcodes + s390_num_opcodes; |
44f2a95d KH |
44 | for (opcode = s390_opcodes; opcode < opcode_end; opcode++) |
45 | { | |
46 | opc_index[(int) opcode->opcode[0]] = opcode - s390_opcodes; | |
47 | while ((opcode < opcode_end) && | |
48 | (opcode[1].opcode[0] == opcode->opcode[0])) | |
49 | opcode++; | |
50 | } | |
112b7c50 AK |
51 | |
52 | for (p = info->disassembler_options; p != NULL; ) | |
44f2a95d | 53 | { |
112b7c50 AK |
54 | if (CONST_STRNEQ (p, "esa")) |
55 | current_arch_mask = 1 << S390_OPCODE_ESA; | |
56 | else if (CONST_STRNEQ (p, "zarch")) | |
57 | current_arch_mask = 1 << S390_OPCODE_ZARCH; | |
58 | else | |
59 | fprintf (stderr, "Unknown S/390 disassembler option: %s\n", p); | |
60 | ||
61 | p = strchr (p, ','); | |
62 | if (p != NULL) | |
63 | p++; | |
44f2a95d | 64 | } |
112b7c50 AK |
65 | |
66 | if (!current_arch_mask) | |
7d4a7d10 | 67 | current_arch_mask = 1 << S390_OPCODE_ZARCH; |
112b7c50 | 68 | |
a85d7ed0 NC |
69 | init_flag = 1; |
70 | } | |
71 | ||
72 | /* Extracts an operand value from an instruction. */ | |
7330f9c3 AK |
73 | /* We do not perform the shift operation for larl-type address |
74 | operands here since that would lead to an overflow of the 32 bit | |
75 | integer value. Instead the shift operation is done when printing | |
76 | the operand in print_insn_s390. */ | |
a85d7ed0 NC |
77 | |
78 | static inline unsigned int | |
47b0e7ad | 79 | s390_extract_operand (unsigned char *insn, const struct s390_operand *operand) |
a85d7ed0 NC |
80 | { |
81 | unsigned int val; | |
82 | int bits; | |
83 | ||
44f2a95d KH |
84 | /* Extract fragments of the operand byte for byte. */ |
85 | insn += operand->shift / 8; | |
a85d7ed0 NC |
86 | bits = (operand->shift & 7) + operand->bits; |
87 | val = 0; | |
44f2a95d KH |
88 | do |
89 | { | |
90 | val <<= 8; | |
91 | val |= (unsigned int) *insn++; | |
92 | bits -= 8; | |
93 | } | |
94 | while (bits > 0); | |
a85d7ed0 | 95 | val >>= -bits; |
44f2a95d KH |
96 | val &= ((1U << (operand->bits - 1)) << 1) - 1; |
97 | ||
bac02689 MS |
98 | /* Check for special long displacement case. */ |
99 | if (operand->bits == 20 && operand->shift == 20) | |
100 | val = (val & 0xff) << 12 | (val & 0xfff00) >> 8; | |
101 | ||
44f2a95d KH |
102 | /* Sign extend value if the operand is signed or pc relative. */ |
103 | if ((operand->flags & (S390_OPERAND_SIGNED | S390_OPERAND_PCREL)) | |
104 | && (val & (1U << (operand->bits - 1)))) | |
105 | val |= (-1U << (operand->bits - 1)) << 1; | |
106 | ||
47b0e7ad | 107 | /* Length x in an instructions has real length x + 1. */ |
a85d7ed0 NC |
108 | if (operand->flags & S390_OPERAND_LENGTH) |
109 | val++; | |
110 | return val; | |
111 | } | |
112 | ||
113 | /* Print a S390 instruction. */ | |
114 | ||
115 | int | |
47b0e7ad | 116 | print_insn_s390 (bfd_vma memaddr, struct disassemble_info *info) |
a85d7ed0 NC |
117 | { |
118 | bfd_byte buffer[6]; | |
119 | const struct s390_opcode *opcode; | |
120 | const struct s390_opcode *opcode_end; | |
121 | unsigned int value; | |
122 | int status, opsize, bufsize; | |
123 | char separator; | |
124 | ||
125 | if (init_flag == 0) | |
44f2a95d | 126 | init_disasm (info); |
a85d7ed0 NC |
127 | |
128 | /* The output looks better if we put 6 bytes on a line. */ | |
129 | info->bytes_per_line = 6; | |
130 | ||
131 | /* Every S390 instruction is max 6 bytes long. */ | |
44f2a95d | 132 | memset (buffer, 0, 6); |
a85d7ed0 | 133 | status = (*info->read_memory_func) (memaddr, buffer, 6, info); |
44f2a95d KH |
134 | if (status != 0) |
135 | { | |
136 | for (bufsize = 0; bufsize < 6; bufsize++) | |
137 | if ((*info->read_memory_func) (memaddr, buffer, bufsize + 1, info) != 0) | |
138 | break; | |
139 | if (bufsize <= 0) | |
140 | { | |
141 | (*info->memory_error_func) (status, memaddr, info); | |
142 | return -1; | |
143 | } | |
144 | /* Opsize calculation looks strange but it works | |
145 | 00xxxxxx -> 2 bytes, 01xxxxxx/10xxxxxx -> 4 bytes, | |
146 | 11xxxxxx -> 6 bytes. */ | |
147 | opsize = ((((buffer[0] >> 6) + 1) >> 1) + 1) << 1; | |
148 | status = opsize > bufsize; | |
149 | } | |
150 | else | |
151 | { | |
152 | bufsize = 6; | |
153 | opsize = ((((buffer[0] >> 6) + 1) >> 1) + 1) << 1; | |
154 | } | |
155 | ||
156 | if (status == 0) | |
157 | { | |
02cbf767 AK |
158 | const struct s390_opcode *op; |
159 | ||
44f2a95d KH |
160 | /* Find the first match in the opcode table. */ |
161 | opcode_end = s390_opcodes + s390_num_opcodes; | |
162 | for (opcode = s390_opcodes + opc_index[(int) buffer[0]]; | |
163 | (opcode < opcode_end) && (buffer[0] == opcode->opcode[0]); | |
164 | opcode++) | |
165 | { | |
166 | const struct s390_operand *operand; | |
167 | const unsigned char *opindex; | |
168 | ||
169 | /* Check architecture. */ | |
af169f23 | 170 | if (!(opcode->modes & current_arch_mask)) |
44f2a95d | 171 | continue; |
02cbf767 | 172 | |
44f2a95d KH |
173 | /* Check signature of the opcode. */ |
174 | if ((buffer[1] & opcode->mask[1]) != opcode->opcode[1] | |
175 | || (buffer[2] & opcode->mask[2]) != opcode->opcode[2] | |
176 | || (buffer[3] & opcode->mask[3]) != opcode->opcode[3] | |
177 | || (buffer[4] & opcode->mask[4]) != opcode->opcode[4] | |
178 | || (buffer[5] & opcode->mask[5]) != opcode->opcode[5]) | |
179 | continue; | |
180 | ||
02cbf767 AK |
181 | /* Advance to an opcode with a more specific mask. */ |
182 | for (op = opcode + 1; op < opcode_end; op++) | |
183 | { | |
184 | if ((buffer[0] & op->mask[0]) != op->opcode[0]) | |
185 | break; | |
186 | ||
187 | if ((buffer[1] & op->mask[1]) != op->opcode[1] | |
188 | || (buffer[2] & op->mask[2]) != op->opcode[2] | |
189 | || (buffer[3] & op->mask[3]) != op->opcode[3] | |
190 | || (buffer[4] & op->mask[4]) != op->opcode[4] | |
191 | || (buffer[5] & op->mask[5]) != op->opcode[5]) | |
192 | continue; | |
193 | ||
194 | if (((int)opcode->mask[0] + opcode->mask[1] + | |
195 | opcode->mask[2] + opcode->mask[3] + | |
196 | opcode->mask[4] + opcode->mask[5]) < | |
197 | ((int)op->mask[0] + op->mask[1] + | |
198 | op->mask[2] + op->mask[3] + | |
199 | op->mask[4] + op->mask[5])) | |
200 | opcode = op; | |
201 | } | |
202 | ||
44f2a95d KH |
203 | /* The instruction is valid. */ |
204 | if (opcode->operands[0] != 0) | |
205 | (*info->fprintf_func) (info->stream, "%s\t", opcode->name); | |
206 | else | |
207 | (*info->fprintf_func) (info->stream, "%s", opcode->name); | |
208 | ||
209 | /* Extract the operands. */ | |
210 | separator = 0; | |
211 | for (opindex = opcode->operands; *opindex != 0; opindex++) | |
212 | { | |
44f2a95d KH |
213 | operand = s390_operands + *opindex; |
214 | value = s390_extract_operand (buffer, operand); | |
215 | ||
216 | if ((operand->flags & S390_OPERAND_INDEX) && value == 0) | |
217 | continue; | |
218 | if ((operand->flags & S390_OPERAND_BASE) && | |
219 | value == 0 && separator == '(') | |
220 | { | |
221 | separator = ','; | |
222 | continue; | |
223 | } | |
224 | ||
225 | if (separator) | |
226 | (*info->fprintf_func) (info->stream, "%c", separator); | |
227 | ||
228 | if (operand->flags & S390_OPERAND_GPR) | |
229 | (*info->fprintf_func) (info->stream, "%%r%i", value); | |
230 | else if (operand->flags & S390_OPERAND_FPR) | |
231 | (*info->fprintf_func) (info->stream, "%%f%i", value); | |
232 | else if (operand->flags & S390_OPERAND_AR) | |
233 | (*info->fprintf_func) (info->stream, "%%a%i", value); | |
234 | else if (operand->flags & S390_OPERAND_CR) | |
235 | (*info->fprintf_func) (info->stream, "%%c%i", value); | |
236 | else if (operand->flags & S390_OPERAND_PCREL) | |
c8676ae4 AK |
237 | (*info->print_address_func) (memaddr + (int)value + (int)value, |
238 | info); | |
44f2a95d KH |
239 | else if (operand->flags & S390_OPERAND_SIGNED) |
240 | (*info->fprintf_func) (info->stream, "%i", (int) value); | |
241 | else | |
ad101263 | 242 | (*info->fprintf_func) (info->stream, "%u", value); |
44f2a95d KH |
243 | |
244 | if (operand->flags & S390_OPERAND_DISP) | |
245 | { | |
246 | separator = '('; | |
247 | } | |
248 | else if (operand->flags & S390_OPERAND_BASE) | |
249 | { | |
250 | (*info->fprintf_func) (info->stream, ")"); | |
251 | separator = ','; | |
252 | } | |
253 | else | |
254 | separator = ','; | |
255 | } | |
256 | ||
257 | /* Found instruction, printed it, return its size. */ | |
258 | return opsize; | |
259 | } | |
260 | /* No matching instruction found, fall through to hex print. */ | |
261 | } | |
262 | ||
263 | if (bufsize >= 4) | |
264 | { | |
265 | value = (unsigned int) buffer[0]; | |
266 | value = (value << 8) + (unsigned int) buffer[1]; | |
267 | value = (value << 8) + (unsigned int) buffer[2]; | |
268 | value = (value << 8) + (unsigned int) buffer[3]; | |
269 | (*info->fprintf_func) (info->stream, ".long\t0x%08x", value); | |
270 | return 4; | |
271 | } | |
272 | else if (bufsize >= 2) | |
273 | { | |
274 | value = (unsigned int) buffer[0]; | |
275 | value = (value << 8) + (unsigned int) buffer[1]; | |
276 | (*info->fprintf_func) (info->stream, ".short\t0x%04x", value); | |
277 | return 2; | |
a85d7ed0 | 278 | } |
44f2a95d KH |
279 | else |
280 | { | |
281 | value = (unsigned int) buffer[0]; | |
282 | (*info->fprintf_func) (info->stream, ".byte\t0x%02x", value); | |
283 | return 1; | |
a85d7ed0 | 284 | } |
a85d7ed0 | 285 | } |
112b7c50 AK |
286 | |
287 | void | |
288 | print_s390_disassembler_options (FILE *stream) | |
289 | { | |
290 | fprintf (stream, _("\n\ | |
291 | The following S/390 specific disassembler options are supported for use\n\ | |
292 | with the -M switch (multiple options should be separated by commas):\n")); | |
293 | ||
294 | fprintf (stream, _(" esa Disassemble in ESA architecture mode\n")); | |
295 | fprintf (stream, _(" zarch Disassemble in z/Architecture mode\n")); | |
296 | } |