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[binutils.git] / opcodes / ppc-dis.c
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1 /* ppc-dis.c -- Disassemble PowerPC instructions
2 Copyright 1994, 1995, 2000, 2001, 2002, 2003
3 Free Software Foundation, Inc.
4 Written by Ian Lance Taylor, Cygnus Support
6 This file is part of GDB, GAS, and the GNU binutils.
8 GDB, GAS, and the GNU binutils are free software; you can redistribute
9 them and/or modify them under the terms of the GNU General Public
10 License as published by the Free Software Foundation; either version
11 2, or (at your option) any later version.
13 GDB, GAS, and the GNU binutils are distributed in the hope that they
14 will be useful, but WITHOUT ANY WARRANTY; without even the implied
15 warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
16 the GNU General Public 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 #include <stdio.h>
23 #include "sysdep.h"
24 #include "dis-asm.h"
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)
31 chip. */
33 static int print_insn_powerpc (bfd_vma, struct disassemble_info *, int, int);
35 struct dis_private {
36 /* Stash the result of parsing disassembler_options here. */
37 int dialect;
40 /* Determine which set of machines to disassemble for. PPC403/601 or
41 BookE. For convenience, also disassemble instructions supported
42 by the AltiVec vector unit. */
44 static int
45 powerpc_dialect (struct disassemble_info *info)
47 int dialect = PPC_OPCODE_PPC | PPC_OPCODE_ALTIVEC;
49 if (BFD_DEFAULT_TARGET_SIZE == 64)
50 dialect |= PPC_OPCODE_64;
52 if (info->disassembler_options
53 && strstr (info->disassembler_options, "booke") != NULL)
54 dialect |= PPC_OPCODE_BOOKE | PPC_OPCODE_BOOKE64;
55 else if ((info->mach == bfd_mach_ppc_e500)
56 || (info->disassembler_options
57 && strstr (info->disassembler_options, "e500") != NULL))
59 dialect |= PPC_OPCODE_BOOKE
60 | PPC_OPCODE_SPE | PPC_OPCODE_ISEL
61 | PPC_OPCODE_EFS | PPC_OPCODE_BRLOCK
62 | PPC_OPCODE_PMR | PPC_OPCODE_CACHELCK
63 | PPC_OPCODE_RFMCI;
64 /* efs* and AltiVec conflict. */
65 dialect &= ~PPC_OPCODE_ALTIVEC;
67 else if (info->disassembler_options
68 && strstr (info->disassembler_options, "efs") != NULL)
70 dialect |= PPC_OPCODE_EFS;
71 /* efs* and AltiVec conflict. */
72 dialect &= ~PPC_OPCODE_ALTIVEC;
74 else
75 dialect |= (PPC_OPCODE_403 | PPC_OPCODE_601 | PPC_OPCODE_CLASSIC
76 | PPC_OPCODE_COMMON);
78 if (info->disassembler_options
79 && strstr (info->disassembler_options, "power4") != NULL)
80 dialect |= PPC_OPCODE_POWER4;
82 if (info->disassembler_options
83 && strstr (info->disassembler_options, "any") != NULL)
84 dialect |= PPC_OPCODE_ANY;
86 if (info->disassembler_options)
88 if (strstr (info->disassembler_options, "32") != NULL)
89 dialect &= ~PPC_OPCODE_64;
90 else if (strstr (info->disassembler_options, "64") != NULL)
91 dialect |= PPC_OPCODE_64;
94 ((struct dis_private *) &info->private_data)->dialect = dialect;
95 return dialect;
98 /* Print a big endian PowerPC instruction. */
101 print_insn_big_powerpc (bfd_vma memaddr, struct disassemble_info *info)
103 int dialect = ((struct dis_private *) &info->private_data)->dialect;
104 return print_insn_powerpc (memaddr, info, 1, dialect);
107 /* Print a little endian PowerPC instruction. */
110 print_insn_little_powerpc (bfd_vma memaddr, struct disassemble_info *info)
112 int dialect = ((struct dis_private *) &info->private_data)->dialect;
113 return print_insn_powerpc (memaddr, info, 0, dialect);
116 /* Print a POWER (RS/6000) instruction. */
119 print_insn_rs6000 (bfd_vma memaddr, struct disassemble_info *info)
121 return print_insn_powerpc (memaddr, info, 1, PPC_OPCODE_POWER);
124 /* Print a PowerPC or POWER instruction. */
126 static int
127 print_insn_powerpc (bfd_vma memaddr,
128 struct disassemble_info *info,
129 int bigendian,
130 int dialect)
132 bfd_byte buffer[4];
133 int status;
134 unsigned long insn;
135 const struct powerpc_opcode *opcode;
136 const struct powerpc_opcode *opcode_end;
137 unsigned long op;
139 if (dialect == 0)
140 dialect = powerpc_dialect (info);
142 status = (*info->read_memory_func) (memaddr, buffer, 4, info);
143 if (status != 0)
145 (*info->memory_error_func) (status, memaddr, info);
146 return -1;
149 if (bigendian)
150 insn = bfd_getb32 (buffer);
151 else
152 insn = bfd_getl32 (buffer);
154 /* Get the major opcode of the instruction. */
155 op = PPC_OP (insn);
157 /* Find the first match in the opcode table. We could speed this up
158 a bit by doing a binary search on the major opcode. */
159 opcode_end = powerpc_opcodes + powerpc_num_opcodes;
160 again:
161 for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++)
163 unsigned long table_op;
164 const unsigned char *opindex;
165 const struct powerpc_operand *operand;
166 int invalid;
167 int need_comma;
168 int need_paren;
170 table_op = PPC_OP (opcode->opcode);
171 if (op < table_op)
172 break;
173 if (op > table_op)
174 continue;
176 if ((insn & opcode->mask) != opcode->opcode
177 || (opcode->flags & dialect) == 0)
178 continue;
180 /* Make two passes over the operands. First see if any of them
181 have extraction functions, and, if they do, make sure the
182 instruction is valid. */
183 invalid = 0;
184 for (opindex = opcode->operands; *opindex != 0; opindex++)
186 operand = powerpc_operands + *opindex;
187 if (operand->extract)
188 (*operand->extract) (insn, dialect, &invalid);
190 if (invalid)
191 continue;
193 /* The instruction is valid. */
194 (*info->fprintf_func) (info->stream, "%s", opcode->name);
195 if (opcode->operands[0] != 0)
196 (*info->fprintf_func) (info->stream, "\t");
198 /* Now extract and print the operands. */
199 need_comma = 0;
200 need_paren = 0;
201 for (opindex = opcode->operands; *opindex != 0; opindex++)
203 long value;
205 operand = powerpc_operands + *opindex;
207 /* Operands that are marked FAKE are simply ignored. We
208 already made sure that the extract function considered
209 the instruction to be valid. */
210 if ((operand->flags & PPC_OPERAND_FAKE) != 0)
211 continue;
213 /* Extract the value from the instruction. */
214 if (operand->extract)
215 value = (*operand->extract) (insn, dialect, &invalid);
216 else
218 value = (insn >> operand->shift) & ((1 << operand->bits) - 1);
219 if ((operand->flags & PPC_OPERAND_SIGNED) != 0
220 && (value & (1 << (operand->bits - 1))) != 0)
221 value -= 1 << operand->bits;
224 /* If the operand is optional, and the value is zero, don't
225 print anything. */
226 if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0
227 && (operand->flags & PPC_OPERAND_NEXT) == 0
228 && value == 0)
229 continue;
231 if (need_comma)
233 (*info->fprintf_func) (info->stream, ",");
234 need_comma = 0;
237 /* Print the operand as directed by the flags. */
238 if ((operand->flags & PPC_OPERAND_GPR) != 0)
239 (*info->fprintf_func) (info->stream, "r%ld", value);
240 else if ((operand->flags & PPC_OPERAND_FPR) != 0)
241 (*info->fprintf_func) (info->stream, "f%ld", value);
242 else if ((operand->flags & PPC_OPERAND_VR) != 0)
243 (*info->fprintf_func) (info->stream, "v%ld", value);
244 else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0)
245 (*info->print_address_func) (memaddr + value, info);
246 else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0)
247 (*info->print_address_func) ((bfd_vma) value & 0xffffffff, info);
248 else if ((operand->flags & PPC_OPERAND_CR) == 0
249 || (dialect & PPC_OPCODE_PPC) == 0)
250 (*info->fprintf_func) (info->stream, "%ld", value);
251 else
253 if (operand->bits == 3)
254 (*info->fprintf_func) (info->stream, "cr%d", value);
255 else
257 static const char *cbnames[4] = { "lt", "gt", "eq", "so" };
258 int cr;
259 int cc;
261 cr = value >> 2;
262 if (cr != 0)
263 (*info->fprintf_func) (info->stream, "4*cr%d+", cr);
264 cc = value & 3;
265 (*info->fprintf_func) (info->stream, "%s", cbnames[cc]);
269 if (need_paren)
271 (*info->fprintf_func) (info->stream, ")");
272 need_paren = 0;
275 if ((operand->flags & PPC_OPERAND_PARENS) == 0)
276 need_comma = 1;
277 else
279 (*info->fprintf_func) (info->stream, "(");
280 need_paren = 1;
284 /* We have found and printed an instruction; return. */
285 return 4;
288 if ((dialect & PPC_OPCODE_ANY) != 0)
290 dialect = ~PPC_OPCODE_ANY;
291 goto again;
294 /* We could not find a match. */
295 (*info->fprintf_func) (info->stream, ".long 0x%lx", insn);
297 return 4;
300 void
301 print_ppc_disassembler_options (FILE *stream)
303 fprintf (stream, "\n\
304 The following PPC specific disassembler options are supported for use with\n\
305 the -M switch:\n");
307 fprintf (stream, " booke|booke32|booke64 Disassemble the BookE instructions\n");
308 fprintf (stream, " e500|e500x2 Disassemble the e500 instructions\n");
309 fprintf (stream, " efs Disassemble the EFS instructions\n");
310 fprintf (stream, " power4 Disassemble the Power4 instructions\n");
311 fprintf (stream, " 32 Do not disassemble 64-bit instructions\n");
312 fprintf (stream, " 64 Allow disassembly of 64-bit instructions\n");