df1f450d29bbc655c7ef5c216acb498c77521869
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. */
26 #include "opcode/s390.h"
28 static int init_flag
= 0;
29 static int opc_index
[256];
30 static int current_arch_mask
= 0;
32 /* Set up index table for first opcode byte. */
35 init_disasm (struct disassemble_info
*info
)
37 const struct s390_opcode
*opcode
;
38 const struct s390_opcode
*opcode_end
;
40 memset (opc_index
, 0, sizeof (opc_index
));
41 opcode_end
= s390_opcodes
+ s390_num_opcodes
;
42 for (opcode
= s390_opcodes
; opcode
< opcode_end
; opcode
++)
44 opc_index
[(int) opcode
->opcode
[0]] = opcode
- s390_opcodes
;
45 while ((opcode
< opcode_end
) &&
46 (opcode
[1].opcode
[0] == opcode
->opcode
[0]))
51 case bfd_mach_s390_31
:
52 current_arch_mask
= 1 << S390_OPCODE_ESA
;
54 case bfd_mach_s390_64
:
55 current_arch_mask
= 1 << S390_OPCODE_ZARCH
;
63 /* Extracts an operand value from an instruction. */
65 static inline unsigned int
66 s390_extract_operand (unsigned char *insn
, const struct s390_operand
*operand
)
71 /* Extract fragments of the operand byte for byte. */
72 insn
+= operand
->shift
/ 8;
73 bits
= (operand
->shift
& 7) + operand
->bits
;
78 val
|= (unsigned int) *insn
++;
83 val
&= ((1U << (operand
->bits
- 1)) << 1) - 1;
85 /* Check for special long displacement case. */
86 if (operand
->bits
== 20 && operand
->shift
== 20)
87 val
= (val
& 0xff) << 12 | (val
& 0xfff00) >> 8;
89 /* Sign extend value if the operand is signed or pc relative. */
90 if ((operand
->flags
& (S390_OPERAND_SIGNED
| S390_OPERAND_PCREL
))
91 && (val
& (1U << (operand
->bits
- 1))))
92 val
|= (-1U << (operand
->bits
- 1)) << 1;
94 /* Double value if the operand is pc relative. */
95 if (operand
->flags
& S390_OPERAND_PCREL
)
98 /* Length x in an instructions has real length x + 1. */
99 if (operand
->flags
& S390_OPERAND_LENGTH
)
104 /* Print a S390 instruction. */
107 print_insn_s390 (bfd_vma memaddr
, struct disassemble_info
*info
)
110 const struct s390_opcode
*opcode
;
111 const struct s390_opcode
*opcode_end
;
113 int status
, opsize
, bufsize
;
119 /* The output looks better if we put 6 bytes on a line. */
120 info
->bytes_per_line
= 6;
122 /* Every S390 instruction is max 6 bytes long. */
123 memset (buffer
, 0, 6);
124 status
= (*info
->read_memory_func
) (memaddr
, buffer
, 6, info
);
127 for (bufsize
= 0; bufsize
< 6; bufsize
++)
128 if ((*info
->read_memory_func
) (memaddr
, buffer
, bufsize
+ 1, info
) != 0)
132 (*info
->memory_error_func
) (status
, memaddr
, info
);
135 /* Opsize calculation looks strange but it works
136 00xxxxxx -> 2 bytes, 01xxxxxx/10xxxxxx -> 4 bytes,
137 11xxxxxx -> 6 bytes. */
138 opsize
= ((((buffer
[0] >> 6) + 1) >> 1) + 1) << 1;
139 status
= opsize
> bufsize
;
144 opsize
= ((((buffer
[0] >> 6) + 1) >> 1) + 1) << 1;
149 /* Find the first match in the opcode table. */
150 opcode_end
= s390_opcodes
+ s390_num_opcodes
;
151 for (opcode
= s390_opcodes
+ opc_index
[(int) buffer
[0]];
152 (opcode
< opcode_end
) && (buffer
[0] == opcode
->opcode
[0]);
155 const struct s390_operand
*operand
;
156 const unsigned char *opindex
;
158 /* Check architecture. */
159 if (!(opcode
->modes
& current_arch_mask
))
161 /* Check signature of the opcode. */
162 if ((buffer
[1] & opcode
->mask
[1]) != opcode
->opcode
[1]
163 || (buffer
[2] & opcode
->mask
[2]) != opcode
->opcode
[2]
164 || (buffer
[3] & opcode
->mask
[3]) != opcode
->opcode
[3]
165 || (buffer
[4] & opcode
->mask
[4]) != opcode
->opcode
[4]
166 || (buffer
[5] & opcode
->mask
[5]) != opcode
->opcode
[5])
169 /* The instruction is valid. */
170 if (opcode
->operands
[0] != 0)
171 (*info
->fprintf_func
) (info
->stream
, "%s\t", opcode
->name
);
173 (*info
->fprintf_func
) (info
->stream
, "%s", opcode
->name
);
175 /* Extract the operands. */
177 for (opindex
= opcode
->operands
; *opindex
!= 0; opindex
++)
181 operand
= s390_operands
+ *opindex
;
182 value
= s390_extract_operand (buffer
, operand
);
184 if ((operand
->flags
& S390_OPERAND_INDEX
) && value
== 0)
186 if ((operand
->flags
& S390_OPERAND_BASE
) &&
187 value
== 0 && separator
== '(')
194 (*info
->fprintf_func
) (info
->stream
, "%c", separator
);
196 if (operand
->flags
& S390_OPERAND_GPR
)
197 (*info
->fprintf_func
) (info
->stream
, "%%r%i", value
);
198 else if (operand
->flags
& S390_OPERAND_FPR
)
199 (*info
->fprintf_func
) (info
->stream
, "%%f%i", value
);
200 else if (operand
->flags
& S390_OPERAND_AR
)
201 (*info
->fprintf_func
) (info
->stream
, "%%a%i", value
);
202 else if (operand
->flags
& S390_OPERAND_CR
)
203 (*info
->fprintf_func
) (info
->stream
, "%%c%i", value
);
204 else if (operand
->flags
& S390_OPERAND_PCREL
)
205 (*info
->print_address_func
) (memaddr
+ (int) value
, info
);
206 else if (operand
->flags
& S390_OPERAND_SIGNED
)
207 (*info
->fprintf_func
) (info
->stream
, "%i", (int) value
);
209 (*info
->fprintf_func
) (info
->stream
, "%u", value
);
211 if (operand
->flags
& S390_OPERAND_DISP
)
215 else if (operand
->flags
& S390_OPERAND_BASE
)
217 (*info
->fprintf_func
) (info
->stream
, ")");
224 /* Found instruction, printed it, return its size. */
227 /* No matching instruction found, fall through to hex print. */
232 value
= (unsigned int) buffer
[0];
233 value
= (value
<< 8) + (unsigned int) buffer
[1];
234 value
= (value
<< 8) + (unsigned int) buffer
[2];
235 value
= (value
<< 8) + (unsigned int) buffer
[3];
236 (*info
->fprintf_func
) (info
->stream
, ".long\t0x%08x", value
);
239 else if (bufsize
>= 2)
241 value
= (unsigned int) buffer
[0];
242 value
= (value
<< 8) + (unsigned int) buffer
[1];
243 (*info
->fprintf_func
) (info
->stream
, ".short\t0x%04x", value
);
248 value
= (unsigned int) buffer
[0];
249 (*info
->fprintf_func
) (info
->stream
, ".byte\t0x%02x", value
);
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