1 /* i370-dis.c -- Disassemble Instruction 370 (ESA/390) instructions
2 Copyright 1994, 2000, 2003, 2005, 2007 Free Software Foundation, Inc.
3 PowerPC version written by Ian Lance Taylor, Cygnus Support
4 Rewritten for i370 ESA/390 support by Linas Vepstas <linas@linas.org>
6 This file is part of the GNU opcodes library.
8 This library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 It is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
16 License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this file; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
26 #include "opcode/i370.h"
28 /* This file provides several disassembler functions, all of which use
29 the disassembler interface defined in dis-asm.h. */
32 print_insn_i370 (bfd_vma memaddr
, struct disassemble_info
*info
)
37 const struct i370_opcode
*opcode
;
38 const struct i370_opcode
*opcode_end
;
40 status
= (*info
->read_memory_func
) (memaddr
, buffer
, 6, info
);
43 (*info
->memory_error_func
) (status
, memaddr
, info
);
47 /* Cast the bytes into the insn (in a host-endian indep way). */
48 insn
.i
[0] = (buffer
[0] << 24) & 0xff000000;
49 insn
.i
[0] |= (buffer
[1] << 16) & 0xff0000;
50 insn
.i
[0] |= (buffer
[2] << 8) & 0xff00;
51 insn
.i
[0] |= buffer
[3] & 0xff;
52 insn
.i
[1] = (buffer
[4] << 24) & 0xff000000;
53 insn
.i
[1] |= (buffer
[5] << 16) & 0xff0000;
55 /* Find the first match in the opcode table. We could speed this up
56 a bit by doing a binary search on the major opcode. */
57 opcode_end
= i370_opcodes
+ i370_num_opcodes
;
58 for (opcode
= i370_opcodes
; opcode
< opcode_end
; opcode
++)
60 const unsigned char *opindex
;
61 const struct i370_operand
*operand
;
65 /* Mask off operands, and look for a match ... */
70 masked
.i
[0] &= 0xffff;
72 masked
.i
[0] &= opcode
->mask
.i
[0];
73 if (masked
.i
[0] != opcode
->opcode
.i
[0])
78 masked
.i
[1] &= opcode
->mask
.i
[1];
79 if (masked
.i
[1] != opcode
->opcode
.i
[1])
83 /* Found a match. adjust a tad. */
90 /* Make two passes over the operands. First see if any of them
91 have extraction functions, and, if they do, make sure the
92 instruction is valid. */
94 for (opindex
= opcode
->operands
; *opindex
!= 0; opindex
++)
96 operand
= i370_operands
+ *opindex
;
98 (*operand
->extract
) (insn
, &invalid
);
103 /* The instruction is valid. */
104 (*info
->fprintf_func
) (info
->stream
, "%s", opcode
->name
);
105 if (opcode
->operands
[0] != 0)
106 (*info
->fprintf_func
) (info
->stream
, "\t");
108 /* Now extract and print the operands. */
109 for (opindex
= opcode
->operands
; *opindex
!= 0; opindex
++)
113 operand
= i370_operands
+ *opindex
;
115 /* Extract the value from the instruction. */
116 if (operand
->extract
)
117 value
= (*operand
->extract
) (insn
, (int *) NULL
);
119 value
= (insn
.i
[0] >> operand
->shift
) & ((1 << operand
->bits
) - 1);
121 /* Print the operand as directed by the flags. */
122 if ((operand
->flags
& I370_OPERAND_OPTIONAL
) != 0)
125 (*info
->fprintf_func
) (info
->stream
, "(r%ld)", value
);
127 else if ((operand
->flags
& I370_OPERAND_SBASE
) != 0)
129 (*info
->fprintf_func
) (info
->stream
, "(r%ld)", value
);
131 else if ((operand
->flags
& I370_OPERAND_INDEX
) != 0)
134 (*info
->fprintf_func
) (info
->stream
, "(r%ld,", value
);
136 (*info
->fprintf_func
) (info
->stream
, "(,");
138 else if ((operand
->flags
& I370_OPERAND_LENGTH
) != 0)
140 (*info
->fprintf_func
) (info
->stream
, "(%ld,", value
);
142 else if ((operand
->flags
& I370_OPERAND_BASE
) != 0)
143 (*info
->fprintf_func
) (info
->stream
, "r%ld)", value
);
144 else if ((operand
->flags
& I370_OPERAND_GPR
) != 0)
145 (*info
->fprintf_func
) (info
->stream
, "r%ld,", value
);
146 else if ((operand
->flags
& I370_OPERAND_FPR
) != 0)
147 (*info
->fprintf_func
) (info
->stream
, "f%ld,", value
);
148 else if ((operand
->flags
& I370_OPERAND_RELATIVE
) != 0)
149 (*info
->fprintf_func
) (info
->stream
, "%ld", value
);
151 (*info
->fprintf_func
) (info
->stream
, " %ld, ", value
);
157 /* We could not find a match. */
158 (*info
->fprintf_func
) (info
->stream
, ".short 0x%02x%02x", buffer
[0], buffer
[1]);
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