1 /* s390-dis.c -- Disassemble S390 instructions
2 Copyright 2000, 2001, 2002, 2003, 2005, 2007 Free Software Foundation, Inc.
3 Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
5 This file is part of the GNU opcodes library.
7 This library 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 3, or (at your option)
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.
17 You should have received a copy of the GNU General Public License
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. */
27 #include "opcode/s390.h"
29 static int init_flag
= 0;
30 static int opc_index
[256];
31 static int current_arch_mask
= 0;
33 /* Set up index table for first opcode byte. */
36 init_disasm (struct disassemble_info
*info
)
38 const struct s390_opcode
*opcode
;
39 const struct s390_opcode
*opcode_end
;
42 memset (opc_index
, 0, sizeof (opc_index
));
43 opcode_end
= s390_opcodes
+ s390_num_opcodes
;
44 for (opcode
= s390_opcodes
; opcode
< opcode_end
; opcode
++)
46 opc_index
[(int) opcode
->opcode
[0]] = opcode
- s390_opcodes
;
47 while ((opcode
< opcode_end
) &&
48 (opcode
[1].opcode
[0] == opcode
->opcode
[0]))
52 for (p
= info
->disassembler_options
; p
!= NULL
; )
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
;
59 fprintf (stderr
, "Unknown S/390 disassembler option: %s\n", p
);
66 if (!current_arch_mask
)
69 case bfd_mach_s390_31
:
70 current_arch_mask
= 1 << S390_OPCODE_ESA
;
72 case bfd_mach_s390_64
:
73 current_arch_mask
= 1 << S390_OPCODE_ZARCH
;
82 /* Extracts an operand value from an instruction. */
84 static inline unsigned int
85 s390_extract_operand (unsigned char *insn
, const struct s390_operand
*operand
)
90 /* Extract fragments of the operand byte for byte. */
91 insn
+= operand
->shift
/ 8;
92 bits
= (operand
->shift
& 7) + operand
->bits
;
97 val
|= (unsigned int) *insn
++;
102 val
&= ((1U << (operand
->bits
- 1)) << 1) - 1;
104 /* Check for special long displacement case. */
105 if (operand
->bits
== 20 && operand
->shift
== 20)
106 val
= (val
& 0xff) << 12 | (val
& 0xfff00) >> 8;
108 /* Sign extend value if the operand is signed or pc relative. */
109 if ((operand
->flags
& (S390_OPERAND_SIGNED
| S390_OPERAND_PCREL
))
110 && (val
& (1U << (operand
->bits
- 1))))
111 val
|= (-1U << (operand
->bits
- 1)) << 1;
113 /* Double value if the operand is pc relative. */
114 if (operand
->flags
& S390_OPERAND_PCREL
)
117 /* Length x in an instructions has real length x + 1. */
118 if (operand
->flags
& S390_OPERAND_LENGTH
)
123 /* Print a S390 instruction. */
126 print_insn_s390 (bfd_vma memaddr
, struct disassemble_info
*info
)
129 const struct s390_opcode
*opcode
;
130 const struct s390_opcode
*opcode_end
;
132 int status
, opsize
, bufsize
;
138 /* The output looks better if we put 6 bytes on a line. */
139 info
->bytes_per_line
= 6;
141 /* Every S390 instruction is max 6 bytes long. */
142 memset (buffer
, 0, 6);
143 status
= (*info
->read_memory_func
) (memaddr
, buffer
, 6, info
);
146 for (bufsize
= 0; bufsize
< 6; bufsize
++)
147 if ((*info
->read_memory_func
) (memaddr
, buffer
, bufsize
+ 1, info
) != 0)
151 (*info
->memory_error_func
) (status
, memaddr
, info
);
154 /* Opsize calculation looks strange but it works
155 00xxxxxx -> 2 bytes, 01xxxxxx/10xxxxxx -> 4 bytes,
156 11xxxxxx -> 6 bytes. */
157 opsize
= ((((buffer
[0] >> 6) + 1) >> 1) + 1) << 1;
158 status
= opsize
> bufsize
;
163 opsize
= ((((buffer
[0] >> 6) + 1) >> 1) + 1) << 1;
168 /* Find the first match in the opcode table. */
169 opcode_end
= s390_opcodes
+ s390_num_opcodes
;
170 for (opcode
= s390_opcodes
+ opc_index
[(int) buffer
[0]];
171 (opcode
< opcode_end
) && (buffer
[0] == opcode
->opcode
[0]);
174 const struct s390_operand
*operand
;
175 const unsigned char *opindex
;
177 /* Check architecture. */
178 if (!(opcode
->modes
& current_arch_mask
))
180 /* Check signature of the opcode. */
181 if ((buffer
[1] & opcode
->mask
[1]) != opcode
->opcode
[1]
182 || (buffer
[2] & opcode
->mask
[2]) != opcode
->opcode
[2]
183 || (buffer
[3] & opcode
->mask
[3]) != opcode
->opcode
[3]
184 || (buffer
[4] & opcode
->mask
[4]) != opcode
->opcode
[4]
185 || (buffer
[5] & opcode
->mask
[5]) != opcode
->opcode
[5])
188 /* The instruction is valid. */
189 if (opcode
->operands
[0] != 0)
190 (*info
->fprintf_func
) (info
->stream
, "%s\t", opcode
->name
);
192 (*info
->fprintf_func
) (info
->stream
, "%s", opcode
->name
);
194 /* Extract the operands. */
196 for (opindex
= opcode
->operands
; *opindex
!= 0; opindex
++)
200 operand
= s390_operands
+ *opindex
;
201 value
= s390_extract_operand (buffer
, operand
);
203 if ((operand
->flags
& S390_OPERAND_INDEX
) && value
== 0)
205 if ((operand
->flags
& S390_OPERAND_BASE
) &&
206 value
== 0 && separator
== '(')
213 (*info
->fprintf_func
) (info
->stream
, "%c", separator
);
215 if (operand
->flags
& S390_OPERAND_GPR
)
216 (*info
->fprintf_func
) (info
->stream
, "%%r%i", value
);
217 else if (operand
->flags
& S390_OPERAND_FPR
)
218 (*info
->fprintf_func
) (info
->stream
, "%%f%i", value
);
219 else if (operand
->flags
& S390_OPERAND_AR
)
220 (*info
->fprintf_func
) (info
->stream
, "%%a%i", value
);
221 else if (operand
->flags
& S390_OPERAND_CR
)
222 (*info
->fprintf_func
) (info
->stream
, "%%c%i", value
);
223 else if (operand
->flags
& S390_OPERAND_PCREL
)
224 (*info
->print_address_func
) (memaddr
+ (int) value
, info
);
225 else if (operand
->flags
& S390_OPERAND_SIGNED
)
226 (*info
->fprintf_func
) (info
->stream
, "%i", (int) value
);
228 (*info
->fprintf_func
) (info
->stream
, "%u", value
);
230 if (operand
->flags
& S390_OPERAND_DISP
)
234 else if (operand
->flags
& S390_OPERAND_BASE
)
236 (*info
->fprintf_func
) (info
->stream
, ")");
243 /* Found instruction, printed it, return its size. */
246 /* No matching instruction found, fall through to hex print. */
251 value
= (unsigned int) buffer
[0];
252 value
= (value
<< 8) + (unsigned int) buffer
[1];
253 value
= (value
<< 8) + (unsigned int) buffer
[2];
254 value
= (value
<< 8) + (unsigned int) buffer
[3];
255 (*info
->fprintf_func
) (info
->stream
, ".long\t0x%08x", value
);
258 else if (bufsize
>= 2)
260 value
= (unsigned int) buffer
[0];
261 value
= (value
<< 8) + (unsigned int) buffer
[1];
262 (*info
->fprintf_func
) (info
->stream
, ".short\t0x%04x", value
);
267 value
= (unsigned int) buffer
[0];
268 (*info
->fprintf_func
) (info
->stream
, ".byte\t0x%02x", value
);
274 print_s390_disassembler_options (FILE *stream
)
276 fprintf (stream
, _("\n\
277 The following S/390 specific disassembler options are supported for use\n\
278 with the -M switch (multiple options should be separated by commas):\n"));
280 fprintf (stream
, _(" esa Disassemble in ESA architecture mode\n"));
281 fprintf (stream
, _(" zarch Disassemble in z/Architecture mode\n"));
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