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, 675 Mass Ave, Cambridge, MA 02139, USA. */
25 #include "opcode/ppc.h"
27 /* This file provides several disassembler functions, all of which use
28 the disassembler interface defined in dis-asm.h. Several functions
29 are provided because this file handles disassembly for the PowerPC
30 in both big and little endian mode and also for the POWER (RS/6000)
33 static int print_insn_powerpc
PARAMS ((bfd_vma
, struct disassemble_info
*,
34 int bigendian
, int dialect
));
36 /* Print a big endian PowerPC instruction. */
39 print_insn_big_powerpc (memaddr
, info
)
41 struct disassemble_info
*info
;
43 return print_insn_powerpc (memaddr
, info
, 1, PPC_OPCODE_PPC
);
46 /* Print a little endian PowerPC instruction. */
49 print_insn_little_powerpc (memaddr
, info
)
51 struct disassemble_info
*info
;
53 return print_insn_powerpc (memaddr
, info
, 0, PPC_OPCODE_PPC
);
56 /* Print a POWER (RS/6000) instruction. */
59 print_insn_rs6000 (memaddr
, info
)
61 struct disassemble_info
*info
;
63 return print_insn_powerpc (memaddr
, info
, 1, PPC_OPCODE_POWER
);
66 /* Print a PowerPC or POWER instruction. */
69 print_insn_powerpc (memaddr
, info
, bigendian
, dialect
)
71 struct disassemble_info
*info
;
78 const struct powerpc_opcode
*opcode
;
79 const struct powerpc_opcode
*opcode_end
;
82 status
= (*info
->read_memory_func
) (memaddr
, buffer
, 4, info
);
85 (*info
->memory_error_func
) (status
, memaddr
, info
);
90 insn
= bfd_getb32 (buffer
);
92 insn
= bfd_getl32 (buffer
);
94 /* Get the major opcode of the instruction. */
97 /* Find the first match in the opcode table. We could speed this up
98 a bit by doing a binary search on the major opcode. */
99 opcode_end
= powerpc_opcodes
+ powerpc_num_opcodes
;
100 for (opcode
= powerpc_opcodes
; opcode
< opcode_end
; opcode
++)
102 unsigned long table_op
;
103 const unsigned char *opindex
;
104 const struct powerpc_operand
*operand
;
109 table_op
= PPC_OP (opcode
->opcode
);
115 if ((insn
& opcode
->mask
) != opcode
->opcode
116 || (opcode
->flags
& dialect
) == 0)
119 /* Make two passes over the operands. First see if any of them
120 have extraction functions, and, if they do, make sure the
121 instruction is valid. */
123 for (opindex
= opcode
->operands
; *opindex
!= 0; opindex
++)
125 operand
= powerpc_operands
+ *opindex
;
126 if (operand
->extract
)
127 (*operand
->extract
) (insn
, &invalid
);
132 /* The instruction is valid. */
133 (*info
->fprintf_func
) (info
->stream
, "%s", opcode
->name
);
134 if (opcode
->operands
[0] != 0)
135 (*info
->fprintf_func
) (info
->stream
, "\t");
137 /* Now extract and print the operands. */
140 for (opindex
= opcode
->operands
; *opindex
!= 0; opindex
++)
144 operand
= powerpc_operands
+ *opindex
;
146 /* Operands that are marked FAKE are simply ignored. We
147 already made sure that the extract function considered
148 the instruction to be valid. */
149 if ((operand
->flags
& PPC_OPERAND_FAKE
) != 0)
152 /* Extract the value from the instruction. */
153 if (operand
->extract
)
154 value
= (*operand
->extract
) (insn
, (int *) NULL
);
157 value
= (insn
>> operand
->shift
) & ((1 << operand
->bits
) - 1);
159 && (value
& (1 << (operand
->bits
- 1))) != 0)
160 value
-= 1 << operand
->bits
;
163 /* If the operand is optional, and the value is zero, don't
165 if ((operand
->flags
& PPC_OPERAND_OPTIONAL
) != 0
166 && (operand
->flags
& PPC_OPERAND_NEXT
) == 0
172 (*info
->fprintf_func
) (info
->stream
, ",");
176 /* Print the operand as directed by the flags. */
177 if ((operand
->flags
& PPC_OPERAND_GPR
) != 0)
178 (*info
->fprintf_func
) (info
->stream
, "r%ld", value
);
179 else if ((operand
->flags
& PPC_OPERAND_FPR
) != 0)
180 (*info
->fprintf_func
) (info
->stream
, "f%ld", value
);
181 else if ((operand
->flags
& PPC_OPERAND_RELATIVE
) != 0)
182 (*info
->print_address_func
) (memaddr
+ value
, info
);
183 else if ((operand
->flags
& PPC_OPERAND_ABSOLUTE
) != 0)
184 (*info
->print_address_func
) ((bfd_vma
) value
& 0xffffffff, info
);
185 else if ((operand
->flags
& PPC_OPERAND_CR
) == 0
186 || (dialect
& PPC_OPCODE_PPC
) == 0)
187 (*info
->fprintf_func
) (info
->stream
, "%ld", value
);
190 if (operand
->bits
== 3)
191 (*info
->fprintf_func
) (info
->stream
, "cr%d", value
);
194 static const char *cbnames
[4] = { "lt", "gt", "eq", "so" };
200 (*info
->fprintf_func
) (info
->stream
, "4*cr%d", cr
);
205 (*info
->fprintf_func
) (info
->stream
, "+");
206 (*info
->fprintf_func
) (info
->stream
, "%s", cbnames
[cc
]);
213 (*info
->fprintf_func
) (info
->stream
, ")");
217 if ((operand
->flags
& PPC_OPERAND_PARENS
) == 0)
221 (*info
->fprintf_func
) (info
->stream
, "(");
226 /* We have found and printed an instruction; return. */
230 /* We could not find a match. */
231 (*info
->fprintf_func
) (info
->stream
, "0x%lx", insn
);
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