1 /* s390-dis.c -- Disassemble S390 instructions
2 Copyright 2000, 2001 Free Software Foundation, Inc.
3 Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
5 This file is part of GDB, GAS and the GNU binutils.
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.
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.
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
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. */
36 struct disassemble_info
*info ATTRIBUTE_UNUSED
;
38 const struct s390_opcode
*opcode
;
39 const struct s390_opcode
*opcode_end
;
41 memset (opc_index
, 0, sizeof (opc_index
));
42 opcode_end
= s390_opcodes
+ s390_num_opcodes
;
43 for (opcode
= s390_opcodes
; opcode
< opcode_end
; opcode
++)
45 opc_index
[(int) opcode
->opcode
[0]] = opcode
- s390_opcodes
;
46 while ((opcode
< opcode_end
) &&
47 (opcode
[1].opcode
[0] == opcode
->opcode
[0]))
52 case bfd_mach_s390_esa
:
53 current_arch_mask
= 1 << S390_OPCODE_ESA
;
55 case bfd_mach_s390_esame
:
56 current_arch_mask
= 1 << S390_OPCODE_ESAME
;
64 /* Extracts an operand value from an instruction. */
66 static inline unsigned int
67 s390_extract_operand (insn
, operand
)
69 const struct s390_operand
*operand
;
74 /* Extract fragments of the operand byte for byte. */
75 insn
+= operand
->shift
/ 8;
76 bits
= (operand
->shift
& 7) + operand
->bits
;
81 val
|= (unsigned int) *insn
++;
86 val
&= ((1U << (operand
->bits
- 1)) << 1) - 1;
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;
93 /* Double value if the operand is pc relative. */
94 if (operand
->flags
& S390_OPERAND_PCREL
)
97 /* Length x in an instructions has real length x+1. */
98 if (operand
->flags
& S390_OPERAND_LENGTH
)
103 /* Print a S390 instruction. */
106 print_insn_s390 (memaddr
, info
)
108 struct disassemble_info
*info
;
111 const struct s390_opcode
*opcode
;
112 const struct s390_opcode
*opcode_end
;
114 int status
, opsize
, bufsize
;
120 /* The output looks better if we put 6 bytes on a line. */
121 info
->bytes_per_line
= 6;
123 /* Every S390 instruction is max 6 bytes long. */
124 memset (buffer
, 0, 6);
125 status
= (*info
->read_memory_func
) (memaddr
, buffer
, 6, info
);
128 for (bufsize
= 0; bufsize
< 6; bufsize
++)
129 if ((*info
->read_memory_func
) (memaddr
, buffer
, bufsize
+ 1, info
) != 0)
133 (*info
->memory_error_func
) (status
, memaddr
, info
);
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
;
145 opsize
= ((((buffer
[0] >> 6) + 1) >> 1) + 1) << 1;
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]);
156 const struct s390_operand
*operand
;
157 const unsigned char *opindex
;
159 /* Check architecture. */
160 if (!(opcode
->architecture
& current_arch_mask
))
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])
170 /* The instruction is valid. */
171 if (opcode
->operands
[0] != 0)
172 (*info
->fprintf_func
) (info
->stream
, "%s\t", opcode
->name
);
174 (*info
->fprintf_func
) (info
->stream
, "%s", opcode
->name
);
176 /* Extract the operands. */
178 for (opindex
= opcode
->operands
; *opindex
!= 0; opindex
++)
182 operand
= s390_operands
+ *opindex
;
183 value
= s390_extract_operand (buffer
, operand
);
185 if ((operand
->flags
& S390_OPERAND_INDEX
) && value
== 0)
187 if ((operand
->flags
& S390_OPERAND_BASE
) &&
188 value
== 0 && separator
== '(')
195 (*info
->fprintf_func
) (info
->stream
, "%c", separator
);
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
);
210 (*info
->fprintf_func
) (info
->stream
, "%i", value
);
212 if (operand
->flags
& S390_OPERAND_DISP
)
216 else if (operand
->flags
& S390_OPERAND_BASE
)
218 (*info
->fprintf_func
) (info
->stream
, ")");
225 /* Found instruction, printed it, return its size. */
228 /* No matching instruction found, fall through to hex print. */
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
);
240 else if (bufsize
>= 2)
242 value
= (unsigned int) buffer
[0];
243 value
= (value
<< 8) + (unsigned int) buffer
[1];
244 (*info
->fprintf_func
) (info
->stream
, ".short\t0x%04x", value
);
249 value
= (unsigned int) buffer
[0];
250 (*info
->fprintf_func
) (info
->stream
, ".byte\t0x%02x", value
);
This page took 0.069697 seconds and 5 git commands to generate.