1 /* i370-dis.c -- Disassemble Instruction 370 (ESA/390) instructions
2 Copyright 1994, 2000, 2003, 2005, 2007, 2012
3 Free Software Foundation, Inc.
4 PowerPC version written by Ian Lance Taylor, Cygnus Support
5 Rewritten for i370 ESA/390 support by Linas Vepstas <linas@linas.org>
7 This file is part of the GNU opcodes library.
9 This library is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 It is distributed in the hope that it will be useful, but WITHOUT
15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
17 License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this file; see the file COPYING. If not, write to the Free
21 Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
27 #include "opcode/i370.h"
29 /* This file provides several disassembler functions, all of which use
30 the disassembler interface defined in dis-asm.h. */
33 print_insn_i370 (bfd_vma memaddr
, struct disassemble_info
*info
)
38 const struct i370_opcode
*opcode
;
39 const struct i370_opcode
*opcode_end
;
41 status
= (*info
->read_memory_func
) (memaddr
, buffer
, 6, info
);
44 (*info
->memory_error_func
) (status
, memaddr
, info
);
48 /* Cast the bytes into the insn (in a host-endian indep way). */
49 insn
.i
[0] = (buffer
[0] << 24) & 0xff000000;
50 insn
.i
[0] |= (buffer
[1] << 16) & 0xff0000;
51 insn
.i
[0] |= (buffer
[2] << 8) & 0xff00;
52 insn
.i
[0] |= buffer
[3] & 0xff;
53 insn
.i
[1] = (buffer
[4] << 24) & 0xff000000;
54 insn
.i
[1] |= (buffer
[5] << 16) & 0xff0000;
56 /* Find the first match in the opcode table. We could speed this up
57 a bit by doing a binary search on the major opcode. */
58 opcode_end
= i370_opcodes
+ i370_num_opcodes
;
59 for (opcode
= i370_opcodes
; opcode
< opcode_end
; opcode
++)
61 const unsigned char *opindex
;
62 const struct i370_operand
*operand
;
66 /* Mask off operands, and look for a match ... */
71 masked
.i
[0] &= 0xffff;
73 masked
.i
[0] &= opcode
->mask
.i
[0];
74 if (masked
.i
[0] != opcode
->opcode
.i
[0])
79 masked
.i
[1] &= opcode
->mask
.i
[1];
80 if (masked
.i
[1] != opcode
->opcode
.i
[1])
84 /* Found a match. adjust a tad. */
91 /* Make two passes over the operands. First see if any of them
92 have extraction functions, and, if they do, make sure the
93 instruction is valid. */
95 for (opindex
= opcode
->operands
; *opindex
!= 0; opindex
++)
97 operand
= i370_operands
+ *opindex
;
99 (*operand
->extract
) (insn
, &invalid
);
104 /* The instruction is valid. */
105 (*info
->fprintf_func
) (info
->stream
, "%s", opcode
->name
);
106 if (opcode
->operands
[0] != 0)
107 (*info
->fprintf_func
) (info
->stream
, "\t");
109 /* Now extract and print the operands. */
110 for (opindex
= opcode
->operands
; *opindex
!= 0; opindex
++)
114 operand
= i370_operands
+ *opindex
;
116 /* Extract the value from the instruction. */
117 if (operand
->extract
)
118 value
= (*operand
->extract
) (insn
, (int *) NULL
);
120 value
= (insn
.i
[0] >> operand
->shift
) & ((1 << operand
->bits
) - 1);
122 /* Print the operand as directed by the flags. */
123 if ((operand
->flags
& I370_OPERAND_OPTIONAL
) != 0)
126 (*info
->fprintf_func
) (info
->stream
, "(r%ld)", value
);
128 else if ((operand
->flags
& I370_OPERAND_SBASE
) != 0)
130 (*info
->fprintf_func
) (info
->stream
, "(r%ld)", value
);
132 else if ((operand
->flags
& I370_OPERAND_INDEX
) != 0)
135 (*info
->fprintf_func
) (info
->stream
, "(r%ld,", value
);
137 (*info
->fprintf_func
) (info
->stream
, "(,");
139 else if ((operand
->flags
& I370_OPERAND_LENGTH
) != 0)
141 (*info
->fprintf_func
) (info
->stream
, "(%ld,", value
);
143 else if ((operand
->flags
& I370_OPERAND_BASE
) != 0)
144 (*info
->fprintf_func
) (info
->stream
, "r%ld)", value
);
145 else if ((operand
->flags
& I370_OPERAND_GPR
) != 0)
146 (*info
->fprintf_func
) (info
->stream
, "r%ld,", value
);
147 else if ((operand
->flags
& I370_OPERAND_FPR
) != 0)
148 (*info
->fprintf_func
) (info
->stream
, "f%ld,", value
);
149 else if ((operand
->flags
& I370_OPERAND_RELATIVE
) != 0)
150 (*info
->fprintf_func
) (info
->stream
, "%ld", value
);
152 (*info
->fprintf_func
) (info
->stream
, " %ld, ", value
);
158 /* We could not find a match. */
159 (*info
->fprintf_func
) (info
->stream
, ".short 0x%02x%02x", buffer
[0], buffer
[1]);
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