1 /* ppc-dis.c -- Disassemble PowerPC instructions
2 Copyright 1994, 1995, 2000 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 static int powerpc_dialect PARAMS ((struct disassemble_info *));
37 /* Determine which set of machines to disassemble for. PPC403/601 or
38 BookE. For convenience, also disassemble instructions supported
39 by the AltiVec vector unit. */
43 struct disassemble_info *info;
45 int dialect = PPC_OPCODE_PPC | PPC_OPCODE_ALTIVEC;
47 if (BFD_DEFAULT_TARGET_SIZE == 64)
48 dialect |= PPC_OPCODE_64;
50 if (info->disassembler_options
51 && (strcmp (info->disassembler_options, "booke") == 0
52 || strcmp (info->disassembler_options, "booke32") == 0
53 || strcmp (info->disassembler_options, "booke64") == 0))
54 dialect |= PPC_OPCODE_BOOKE | PPC_OPCODE_BOOKE64;
56 dialect |= PPC_OPCODE_403 | PPC_OPCODE_601;
58 if (info->disassembler_options)
60 if (strstr (info->disassembler_options, "32") != NULL)
61 dialect &= ~PPC_OPCODE_64;
62 else if (strstr (info->disassembler_options, "64") != NULL)
63 dialect |= PPC_OPCODE_64;
69 /* Print a big endian PowerPC instruction. */
72 print_insn_big_powerpc (memaddr, info)
74 struct disassemble_info *info;
76 return print_insn_powerpc (memaddr, info, 1, powerpc_dialect(info));
79 /* Print a little endian PowerPC instruction. */
82 print_insn_little_powerpc (memaddr, info)
84 struct disassemble_info *info;
86 return print_insn_powerpc (memaddr, info, 0, powerpc_dialect(info));
89 /* Print a POWER (RS/6000) instruction. */
92 print_insn_rs6000 (memaddr, info)
94 struct disassemble_info *info;
96 return print_insn_powerpc (memaddr, info, 1, PPC_OPCODE_POWER);
99 /* Print a PowerPC or POWER instruction. */
102 print_insn_powerpc (memaddr, info, bigendian, dialect)
104 struct disassemble_info *info;
111 const struct powerpc_opcode *opcode;
112 const struct powerpc_opcode *opcode_end;
115 status = (*info->read_memory_func) (memaddr, buffer, 4, info);
118 (*info->memory_error_func) (status, memaddr, info);
123 insn = bfd_getb32 (buffer);
125 insn = bfd_getl32 (buffer);
127 /* Get the major opcode of the instruction. */
130 /* Find the first match in the opcode table. We could speed this up
131 a bit by doing a binary search on the major opcode. */
132 opcode_end = powerpc_opcodes + powerpc_num_opcodes;
133 for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++)
135 unsigned long table_op;
136 const unsigned char *opindex;
137 const struct powerpc_operand *operand;
142 table_op = PPC_OP (opcode->opcode);
148 if ((insn & opcode->mask) != opcode->opcode
149 || (opcode->flags & dialect) == 0)
152 /* Make two passes over the operands. First see if any of them
153 have extraction functions, and, if they do, make sure the
154 instruction is valid. */
156 for (opindex = opcode->operands; *opindex != 0; opindex++)
158 operand = powerpc_operands + *opindex;
159 if (operand->extract)
160 (*operand->extract) (insn, dialect, &invalid);
165 /* The instruction is valid. */
166 (*info->fprintf_func) (info->stream, "%s", opcode->name);
167 if (opcode->operands[0] != 0)
168 (*info->fprintf_func) (info->stream, "\t");
170 /* Now extract and print the operands. */
173 for (opindex = opcode->operands; *opindex != 0; opindex++)
177 operand = powerpc_operands + *opindex;
179 /* Operands that are marked FAKE are simply ignored. We
180 already made sure that the extract function considered
181 the instruction to be valid. */
182 if ((operand->flags & PPC_OPERAND_FAKE) != 0)
185 /* Extract the value from the instruction. */
186 if (operand->extract)
187 value = (*operand->extract) (insn, dialect, (int *) NULL);
190 value = (insn >> operand->shift) & ((1 << operand->bits) - 1);
191 if ((operand->flags & PPC_OPERAND_SIGNED) != 0
192 && (value & (1 << (operand->bits - 1))) != 0)
193 value -= 1 << operand->bits;
196 /* If the operand is optional, and the value is zero, don't
198 if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0
199 && (operand->flags & PPC_OPERAND_NEXT) == 0
205 (*info->fprintf_func) (info->stream, ",");
209 /* Print the operand as directed by the flags. */
210 if ((operand->flags & PPC_OPERAND_GPR) != 0)
211 (*info->fprintf_func) (info->stream, "r%ld", value);
212 else if ((operand->flags & PPC_OPERAND_FPR) != 0)
213 (*info->fprintf_func) (info->stream, "f%ld", value);
214 else if ((operand->flags & PPC_OPERAND_VR) != 0)
215 (*info->fprintf_func) (info->stream, "v%ld", value);
216 else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0)
217 (*info->print_address_func) (memaddr + value, info);
218 else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0)
219 (*info->print_address_func) ((bfd_vma) value & 0xffffffff, info);
220 else if ((operand->flags & PPC_OPERAND_CR) == 0
221 || (dialect & PPC_OPCODE_PPC) == 0)
222 (*info->fprintf_func) (info->stream, "%ld", value);
225 if (operand->bits == 3)
226 (*info->fprintf_func) (info->stream, "cr%d", value);
229 static const char *cbnames[4] = { "lt", "gt", "eq", "so" };
235 (*info->fprintf_func) (info->stream, "4*cr%d", cr);
240 (*info->fprintf_func) (info->stream, "+");
241 (*info->fprintf_func) (info->stream, "%s", cbnames[cc]);
248 (*info->fprintf_func) (info->stream, ")");
252 if ((operand->flags & PPC_OPERAND_PARENS) == 0)
256 (*info->fprintf_func) (info->stream, "(");
261 /* We have found and printed an instruction; return. */
265 /* We could not find a match. */
266 (*info->fprintf_func) (info->stream, ".long 0x%lx", insn);