1 /* ppc-dis.c -- Disassemble PowerPC instructions
2 Copyright 1994 Free Software Foundation, Inc.
3 Written by Ian Lance Taylor, Cygnus Support
5 This file is part of GDB, GAS, and the GNU binutils.
7 GDB, GAS, and the GNU binutils are free software; you can redistribute
8 them and/or modify them under the terms of the GNU General Public
9 License as published by the Free Software Foundation; either version
10 2, or (at your option) any later version.
12 GDB, GAS, and the GNU binutils are distributed in the hope that they
13 will be useful, but WITHOUT ANY WARRANTY; without even the implied
14 warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 the GNU General Public 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 Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
24 #include "opcode/ppc.h"
26 /* This file provides several disassembler functions, all of which use
27 the disassembler interface defined in dis-asm.h. Several functions
28 are provided because this file handles disassembly for the PowerPC
29 in both big and little endian mode and also for the POWER (RS/6000)
32 static int print_insn_powerpc
PARAMS ((bfd_vma
, struct disassemble_info
*,
33 int bigendian
, int dialect
));
35 /* Print a big endian PowerPC instruction. For convenience, also
36 disassemble instructions supported by the Motorola PowerPC 601. */
39 print_insn_big_powerpc (memaddr
, info
)
41 struct disassemble_info
*info
;
43 return print_insn_powerpc (memaddr
, info
, 1,
44 PPC_OPCODE_PPC
| PPC_OPCODE_601
);
47 /* Print a little endian PowerPC instruction. For convenience, also
48 disassemble instructions supported by the Motorola PowerPC 601. */
51 print_insn_little_powerpc (memaddr
, info
)
53 struct disassemble_info
*info
;
55 return print_insn_powerpc (memaddr
, info
, 0,
56 PPC_OPCODE_PPC
| PPC_OPCODE_601
);
59 /* Print a POWER (RS/6000) instruction. */
62 print_insn_rs6000 (memaddr
, info
)
64 struct disassemble_info
*info
;
66 return print_insn_powerpc (memaddr
, info
, 1, PPC_OPCODE_POWER
);
69 /* Print a PowerPC or POWER instruction. */
72 print_insn_powerpc (memaddr
, info
, bigendian
, dialect
)
74 struct disassemble_info
*info
;
81 const struct powerpc_opcode
*opcode
;
82 const struct powerpc_opcode
*opcode_end
;
85 status
= (*info
->read_memory_func
) (memaddr
, buffer
, 4, info
);
88 (*info
->memory_error_func
) (status
, memaddr
, info
);
93 insn
= bfd_getb32 (buffer
);
95 insn
= bfd_getl32 (buffer
);
97 /* Get the major opcode of the instruction. */
100 /* Find the first match in the opcode table. We could speed this up
101 a bit by doing a binary search on the major opcode. */
102 opcode_end
= powerpc_opcodes
+ powerpc_num_opcodes
;
103 for (opcode
= powerpc_opcodes
; opcode
< opcode_end
; opcode
++)
105 unsigned long table_op
;
106 const unsigned char *opindex
;
107 const struct powerpc_operand
*operand
;
112 table_op
= PPC_OP (opcode
->opcode
);
118 if ((insn
& opcode
->mask
) != opcode
->opcode
119 || (opcode
->flags
& dialect
) == 0)
122 /* Make two passes over the operands. First see if any of them
123 have extraction functions, and, if they do, make sure the
124 instruction is valid. */
126 for (opindex
= opcode
->operands
; *opindex
!= 0; opindex
++)
128 operand
= powerpc_operands
+ *opindex
;
129 if (operand
->extract
)
130 (*operand
->extract
) (insn
, &invalid
);
135 /* The instruction is valid. */
136 (*info
->fprintf_func
) (info
->stream
, "%s", opcode
->name
);
137 if (opcode
->operands
[0] != 0)
138 (*info
->fprintf_func
) (info
->stream
, "\t");
140 /* Now extract and print the operands. */
143 for (opindex
= opcode
->operands
; *opindex
!= 0; opindex
++)
147 operand
= powerpc_operands
+ *opindex
;
149 /* Operands that are marked FAKE are simply ignored. We
150 already made sure that the extract function considered
151 the instruction to be valid. */
152 if ((operand
->flags
& PPC_OPERAND_FAKE
) != 0)
155 /* Extract the value from the instruction. */
156 if (operand
->extract
)
157 value
= (*operand
->extract
) (insn
, (int *) NULL
);
160 value
= (insn
>> operand
->shift
) & ((1 << operand
->bits
) - 1);
161 if ((operand
->flags
& PPC_OPERAND_SIGNED
) != 0
162 && (value
& (1 << (operand
->bits
- 1))) != 0)
163 value
-= 1 << operand
->bits
;
166 /* If the operand is optional, and the value is zero, don't
168 if ((operand
->flags
& PPC_OPERAND_OPTIONAL
) != 0
169 && (operand
->flags
& PPC_OPERAND_NEXT
) == 0
175 (*info
->fprintf_func
) (info
->stream
, ",");
179 /* Print the operand as directed by the flags. */
180 if ((operand
->flags
& PPC_OPERAND_GPR
) != 0)
181 (*info
->fprintf_func
) (info
->stream
, "r%ld", value
);
182 else if ((operand
->flags
& PPC_OPERAND_FPR
) != 0)
183 (*info
->fprintf_func
) (info
->stream
, "f%ld", value
);
184 else if ((operand
->flags
& PPC_OPERAND_RELATIVE
) != 0)
185 (*info
->print_address_func
) (memaddr
+ value
, info
);
186 else if ((operand
->flags
& PPC_OPERAND_ABSOLUTE
) != 0)
187 (*info
->print_address_func
) ((bfd_vma
) value
& 0xffffffff, info
);
188 else if ((operand
->flags
& PPC_OPERAND_CR
) == 0
189 || (dialect
& PPC_OPCODE_PPC
) == 0)
190 (*info
->fprintf_func
) (info
->stream
, "%ld", value
);
193 if (operand
->bits
== 3)
194 (*info
->fprintf_func
) (info
->stream
, "cr%d", value
);
197 static const char *cbnames
[4] = { "lt", "gt", "eq", "so" };
203 (*info
->fprintf_func
) (info
->stream
, "4*cr%d", cr
);
208 (*info
->fprintf_func
) (info
->stream
, "+");
209 (*info
->fprintf_func
) (info
->stream
, "%s", cbnames
[cc
]);
216 (*info
->fprintf_func
) (info
->stream
, ")");
220 if ((operand
->flags
& PPC_OPERAND_PARENS
) == 0)
224 (*info
->fprintf_func
) (info
->stream
, "(");
229 /* We have found and printed an instruction; return. */
233 /* We could not find a match. */
234 (*info
->fprintf_func
) (info
->stream
, ".long 0x%lx", insn
);
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