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 */
35 struct disassemble_info
*info ATTRIBUTE_UNUSED
;
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
++) {
43 opc_index
[(int) opcode
->opcode
[0]] = opcode
- s390_opcodes
;
44 while ((opcode
< opcode_end
) &&
45 (opcode
[1].opcode
[0] == opcode
->opcode
[0]))
49 case bfd_mach_s390_esa
:
50 current_arch_mask
= 1 << S390_OPCODE_ESA
;
52 case bfd_mach_s390_esame
:
53 current_arch_mask
= 1 << S390_OPCODE_ESAME
;
61 /* Extracts an operand value from an instruction. */
63 static inline unsigned int
64 s390_extract_operand (insn
, operand
)
66 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
;
77 val
|= (unsigned int) *insn
++;
81 val
&= ((1U << (operand
->bits
-1))<<1) - 1;
83 /* sign extend value if the operand is signed or pc relative */
84 if ((operand
->flags
& (S390_OPERAND_SIGNED
|S390_OPERAND_PCREL
)) &&
85 (val
& (1U << (operand
->bits
-1))))
86 val
|= (-1U << (operand
->bits
-1))<<1;
88 /* double value if the operand is pc relative */
89 if (operand
->flags
& S390_OPERAND_PCREL
)
92 /* length x in an instructions has real length x+1 */
93 if (operand
->flags
& S390_OPERAND_LENGTH
)
98 /* Print a S390 instruction. */
101 print_insn_s390 (memaddr
, info
)
103 struct disassemble_info
*info
;
106 const struct s390_opcode
*opcode
;
107 const struct s390_opcode
*opcode_end
;
109 int status
, opsize
, bufsize
;
115 /* The output looks better if we put 6 bytes on a line. */
116 info
->bytes_per_line
= 6;
118 /* Every S390 instruction is max 6 bytes long. */
119 memset(buffer
, 0, 6);
120 status
= (*info
->read_memory_func
) (memaddr
, buffer
, 6, info
);
122 for (bufsize
= 0; bufsize
< 6; bufsize
++)
123 if ((*info
->read_memory_func
) (memaddr
, buffer
, bufsize
+1, info
) != 0)
126 (*info
->memory_error_func
) (status
, memaddr
, info
);
129 /* Opsize calculation looks strange but it works
130 00xxxxxx -> 2 bytes, 01xxxxxx/10xxxxxx -> 4 bytes,
131 11xxxxxx -> 6 bytes. */
132 opsize
= ((((buffer
[0]>>6)+1)>>1)+1)<<1;
133 status
= opsize
> bufsize
;
136 opsize
= ((((buffer
[0]>>6)+1)>>1)+1)<<1;
140 /* Find the first match in the opcode table. */
141 opcode_end
= s390_opcodes
+ s390_num_opcodes
;
142 for (opcode
= s390_opcodes
+ opc_index
[(int) buffer
[0]];
143 (opcode
< opcode_end
) && (buffer
[0] == opcode
->opcode
[0]);
145 const struct s390_operand
*operand
;
146 const unsigned char *opindex
;
148 /* check architecture */
149 if (!(opcode
->architecture
& current_arch_mask
))
151 /* check signature of the opcode */
152 if ((buffer
[1] & opcode
->mask
[1]) != opcode
->opcode
[1] ||
153 (buffer
[2] & opcode
->mask
[2]) != opcode
->opcode
[2] ||
154 (buffer
[3] & opcode
->mask
[3]) != opcode
->opcode
[3] ||
155 (buffer
[4] & opcode
->mask
[4]) != opcode
->opcode
[4] ||
156 (buffer
[5] & opcode
->mask
[5]) != opcode
->opcode
[5])
159 /* the instruction is valid */
160 if (opcode
->operands
[0] != 0)
161 (*info
->fprintf_func
) (info
->stream
, "%s\t", opcode
->name
);
163 (*info
->fprintf_func
) (info
->stream
, "%s", opcode
->name
);
165 /* Extract the operands. */
167 for (opindex
= opcode
->operands
; *opindex
!= 0; opindex
++) {
170 operand
= s390_operands
+ *opindex
;
171 value
= s390_extract_operand(buffer
, operand
);
173 if ((operand
->flags
& S390_OPERAND_INDEX
) && value
== 0)
175 if ((operand
->flags
& S390_OPERAND_BASE
) &&
176 value
== 0 && separator
== '(') {
182 (*info
->fprintf_func
) (info
->stream
, "%c", separator
);
184 if (operand
->flags
& S390_OPERAND_GPR
)
185 (*info
->fprintf_func
) (info
->stream
, "%%r%i", value
);
186 else if (operand
->flags
& S390_OPERAND_FPR
)
187 (*info
->fprintf_func
) (info
->stream
, "%%f%i", value
);
188 else if (operand
->flags
& S390_OPERAND_AR
)
189 (*info
->fprintf_func
) (info
->stream
, "%%a%i", value
);
190 else if (operand
->flags
& S390_OPERAND_CR
)
191 (*info
->fprintf_func
) (info
->stream
, "%%c%i", value
);
192 else if (operand
->flags
& S390_OPERAND_PCREL
)
193 (*info
->print_address_func
) (memaddr
+ (int) value
, info
);
194 else if (operand
->flags
& S390_OPERAND_SIGNED
)
195 (*info
->fprintf_func
) (info
->stream
, "%i", (int) value
);
197 (*info
->fprintf_func
) (info
->stream
, "%i", value
);
199 if (operand
->flags
& S390_OPERAND_DISP
) {
201 } else if (operand
->flags
& S390_OPERAND_BASE
) {
202 (*info
->fprintf_func
) (info
->stream
, ")");
208 /* found instruction, printed it, return its size */
211 /* no matching instruction found, fall through to hex print */
215 value
= (unsigned int) buffer
[0];
216 value
= (value
<< 8) + (unsigned int) buffer
[1];
217 value
= (value
<< 8) + (unsigned int) buffer
[2];
218 value
= (value
<< 8) + (unsigned int) buffer
[3];
219 (*info
->fprintf_func
) (info
->stream
,".long\t0x%08x", value
);
221 } else if (bufsize
>= 2) {
222 value
= (unsigned int) buffer
[0];
223 value
= (value
<< 8) + (unsigned int) buffer
[1];
224 (*info
->fprintf_func
) (info
->stream
,".short\t0x%04x", value
);
227 value
= (unsigned int) buffer
[0];
228 (*info
->fprintf_func
) (info
->stream
,".byte\t0x%02x", value
);
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