Commit | Line | Data |
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a85d7ed0 | 1 | /* s390-dis.c -- Disassemble S390 instructions |
060d22b0 | 2 | Copyright 2000, 2001 Free Software Foundation, Inc. |
a85d7ed0 NC |
3 | Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). |
4 | ||
5 | This file is part of GDB, GAS and the GNU binutils. | |
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 | |
20 | 02111-1307, USA. */ | |
21 | ||
22 | #include <stdio.h> | |
23 | #include "ansidecl.h" | |
24 | #include "sysdep.h" | |
25 | #include "dis-asm.h" | |
26 | #include "opcode/s390.h" | |
27 | ||
28 | static int init_flag = 0; | |
29 | static int opc_index[256]; | |
30 | static int current_arch_mask = 0; | |
31 | ||
44f2a95d KH |
32 | /* Set up index table for first opcode byte. */ |
33 | ||
34 | static void | |
35 | init_disasm (info) | |
36 | struct disassemble_info *info ATTRIBUTE_UNUSED; | |
a85d7ed0 NC |
37 | { |
38 | const struct s390_opcode *opcode; | |
39 | const struct s390_opcode *opcode_end; | |
40 | ||
44f2a95d | 41 | memset (opc_index, 0, sizeof (opc_index)); |
a85d7ed0 | 42 | opcode_end = s390_opcodes + s390_num_opcodes; |
44f2a95d KH |
43 | for (opcode = s390_opcodes; opcode < opcode_end; opcode++) |
44 | { | |
45 | opc_index[(int) opcode->opcode[0]] = opcode - s390_opcodes; | |
46 | while ((opcode < opcode_end) && | |
47 | (opcode[1].opcode[0] == opcode->opcode[0])) | |
48 | opcode++; | |
49 | } | |
50 | switch (info->mach) | |
51 | { | |
52 | case bfd_mach_s390_esa: | |
53 | current_arch_mask = 1 << S390_OPCODE_ESA; | |
54 | break; | |
55 | case bfd_mach_s390_esame: | |
56 | current_arch_mask = 1 << S390_OPCODE_ESAME; | |
57 | break; | |
58 | default: | |
59 | abort (); | |
60 | } | |
a85d7ed0 NC |
61 | init_flag = 1; |
62 | } | |
63 | ||
64 | /* Extracts an operand value from an instruction. */ | |
65 | ||
66 | static inline unsigned int | |
67 | s390_extract_operand (insn, operand) | |
68 | unsigned char *insn; | |
69 | const struct s390_operand *operand; | |
70 | { | |
71 | unsigned int val; | |
72 | int bits; | |
73 | ||
44f2a95d KH |
74 | /* Extract fragments of the operand byte for byte. */ |
75 | insn += operand->shift / 8; | |
a85d7ed0 NC |
76 | bits = (operand->shift & 7) + operand->bits; |
77 | val = 0; | |
44f2a95d KH |
78 | do |
79 | { | |
80 | val <<= 8; | |
81 | val |= (unsigned int) *insn++; | |
82 | bits -= 8; | |
83 | } | |
84 | while (bits > 0); | |
a85d7ed0 | 85 | val >>= -bits; |
44f2a95d KH |
86 | val &= ((1U << (operand->bits - 1)) << 1) - 1; |
87 | ||
88 | /* Sign extend value if the operand is signed or pc relative. */ | |
89 | if ((operand->flags & (S390_OPERAND_SIGNED | S390_OPERAND_PCREL)) | |
90 | && (val & (1U << (operand->bits - 1)))) | |
91 | val |= (-1U << (operand->bits - 1)) << 1; | |
92 | ||
93 | /* Double value if the operand is pc relative. */ | |
a85d7ed0 NC |
94 | if (operand->flags & S390_OPERAND_PCREL) |
95 | val <<= 1; | |
44f2a95d KH |
96 | |
97 | /* Length x in an instructions has real length x+1. */ | |
a85d7ed0 NC |
98 | if (operand->flags & S390_OPERAND_LENGTH) |
99 | val++; | |
100 | return val; | |
101 | } | |
102 | ||
103 | /* Print a S390 instruction. */ | |
104 | ||
105 | int | |
106 | print_insn_s390 (memaddr, info) | |
107 | bfd_vma memaddr; | |
108 | struct disassemble_info *info; | |
109 | { | |
110 | bfd_byte buffer[6]; | |
111 | const struct s390_opcode *opcode; | |
112 | const struct s390_opcode *opcode_end; | |
113 | unsigned int value; | |
114 | int status, opsize, bufsize; | |
115 | char separator; | |
116 | ||
117 | if (init_flag == 0) | |
44f2a95d | 118 | init_disasm (info); |
a85d7ed0 NC |
119 | |
120 | /* The output looks better if we put 6 bytes on a line. */ | |
121 | info->bytes_per_line = 6; | |
122 | ||
123 | /* Every S390 instruction is max 6 bytes long. */ | |
44f2a95d | 124 | memset (buffer, 0, 6); |
a85d7ed0 | 125 | status = (*info->read_memory_func) (memaddr, buffer, 6, info); |
44f2a95d KH |
126 | if (status != 0) |
127 | { | |
128 | for (bufsize = 0; bufsize < 6; bufsize++) | |
129 | if ((*info->read_memory_func) (memaddr, buffer, bufsize + 1, info) != 0) | |
130 | break; | |
131 | if (bufsize <= 0) | |
132 | { | |
133 | (*info->memory_error_func) (status, memaddr, info); | |
134 | return -1; | |
135 | } | |
136 | /* Opsize calculation looks strange but it works | |
137 | 00xxxxxx -> 2 bytes, 01xxxxxx/10xxxxxx -> 4 bytes, | |
138 | 11xxxxxx -> 6 bytes. */ | |
139 | opsize = ((((buffer[0] >> 6) + 1) >> 1) + 1) << 1; | |
140 | status = opsize > bufsize; | |
141 | } | |
142 | else | |
143 | { | |
144 | bufsize = 6; | |
145 | opsize = ((((buffer[0] >> 6) + 1) >> 1) + 1) << 1; | |
146 | } | |
147 | ||
148 | if (status == 0) | |
149 | { | |
150 | /* Find the first match in the opcode table. */ | |
151 | opcode_end = s390_opcodes + s390_num_opcodes; | |
152 | for (opcode = s390_opcodes + opc_index[(int) buffer[0]]; | |
153 | (opcode < opcode_end) && (buffer[0] == opcode->opcode[0]); | |
154 | opcode++) | |
155 | { | |
156 | const struct s390_operand *operand; | |
157 | const unsigned char *opindex; | |
158 | ||
159 | /* Check architecture. */ | |
160 | if (!(opcode->architecture & current_arch_mask)) | |
161 | continue; | |
162 | /* Check signature of the opcode. */ | |
163 | if ((buffer[1] & opcode->mask[1]) != opcode->opcode[1] | |
164 | || (buffer[2] & opcode->mask[2]) != opcode->opcode[2] | |
165 | || (buffer[3] & opcode->mask[3]) != opcode->opcode[3] | |
166 | || (buffer[4] & opcode->mask[4]) != opcode->opcode[4] | |
167 | || (buffer[5] & opcode->mask[5]) != opcode->opcode[5]) | |
168 | continue; | |
169 | ||
170 | /* The instruction is valid. */ | |
171 | if (opcode->operands[0] != 0) | |
172 | (*info->fprintf_func) (info->stream, "%s\t", opcode->name); | |
173 | else | |
174 | (*info->fprintf_func) (info->stream, "%s", opcode->name); | |
175 | ||
176 | /* Extract the operands. */ | |
177 | separator = 0; | |
178 | for (opindex = opcode->operands; *opindex != 0; opindex++) | |
179 | { | |
180 | unsigned int value; | |
181 | ||
182 | operand = s390_operands + *opindex; | |
183 | value = s390_extract_operand (buffer, operand); | |
184 | ||
185 | if ((operand->flags & S390_OPERAND_INDEX) && value == 0) | |
186 | continue; | |
187 | if ((operand->flags & S390_OPERAND_BASE) && | |
188 | value == 0 && separator == '(') | |
189 | { | |
190 | separator = ','; | |
191 | continue; | |
192 | } | |
193 | ||
194 | if (separator) | |
195 | (*info->fprintf_func) (info->stream, "%c", separator); | |
196 | ||
197 | if (operand->flags & S390_OPERAND_GPR) | |
198 | (*info->fprintf_func) (info->stream, "%%r%i", value); | |
199 | else if (operand->flags & S390_OPERAND_FPR) | |
200 | (*info->fprintf_func) (info->stream, "%%f%i", value); | |
201 | else if (operand->flags & S390_OPERAND_AR) | |
202 | (*info->fprintf_func) (info->stream, "%%a%i", value); | |
203 | else if (operand->flags & S390_OPERAND_CR) | |
204 | (*info->fprintf_func) (info->stream, "%%c%i", value); | |
205 | else if (operand->flags & S390_OPERAND_PCREL) | |
206 | (*info->print_address_func) (memaddr + (int) value, info); | |
207 | else if (operand->flags & S390_OPERAND_SIGNED) | |
208 | (*info->fprintf_func) (info->stream, "%i", (int) value); | |
209 | else | |
210 | (*info->fprintf_func) (info->stream, "%i", value); | |
211 | ||
212 | if (operand->flags & S390_OPERAND_DISP) | |
213 | { | |
214 | separator = '('; | |
215 | } | |
216 | else if (operand->flags & S390_OPERAND_BASE) | |
217 | { | |
218 | (*info->fprintf_func) (info->stream, ")"); | |
219 | separator = ','; | |
220 | } | |
221 | else | |
222 | separator = ','; | |
223 | } | |
224 | ||
225 | /* Found instruction, printed it, return its size. */ | |
226 | return opsize; | |
227 | } | |
228 | /* No matching instruction found, fall through to hex print. */ | |
229 | } | |
230 | ||
231 | if (bufsize >= 4) | |
232 | { | |
233 | value = (unsigned int) buffer[0]; | |
234 | value = (value << 8) + (unsigned int) buffer[1]; | |
235 | value = (value << 8) + (unsigned int) buffer[2]; | |
236 | value = (value << 8) + (unsigned int) buffer[3]; | |
237 | (*info->fprintf_func) (info->stream, ".long\t0x%08x", value); | |
238 | return 4; | |
239 | } | |
240 | else if (bufsize >= 2) | |
241 | { | |
242 | value = (unsigned int) buffer[0]; | |
243 | value = (value << 8) + (unsigned int) buffer[1]; | |
244 | (*info->fprintf_func) (info->stream, ".short\t0x%04x", value); | |
245 | return 2; | |
a85d7ed0 | 246 | } |
44f2a95d KH |
247 | else |
248 | { | |
249 | value = (unsigned int) buffer[0]; | |
250 | (*info->fprintf_func) (info->stream, ".byte\t0x%02x", value); | |
251 | return 1; | |
a85d7ed0 | 252 | } |
a85d7ed0 | 253 | } |