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252b5132 RH |
1 | /* ppc-dis.c -- Disassemble PowerPC instructions |
2 | Copyright 1994 Free Software Foundation, Inc. | |
3 | Written by Ian Lance Taylor, Cygnus Support | |
4 | ||
5 | This file is part of GDB, GAS, and the GNU binutils. | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
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. */ | |
20 | ||
21 | #include <stdio.h> | |
252b5132 RH |
22 | #include "sysdep.h" |
23 | #include "dis-asm.h" | |
24 | #include "opcode/ppc.h" | |
25 | ||
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) | |
30 | chip. */ | |
31 | ||
32 | static int print_insn_powerpc PARAMS ((bfd_vma, struct disassemble_info *, | |
33 | int bigendian, int dialect)); | |
34 | ||
35 | /* Print a big endian PowerPC instruction. For convenience, also | |
36 | disassemble instructions supported by the Motorola PowerPC 601. */ | |
37 | ||
38 | int | |
39 | print_insn_big_powerpc (memaddr, info) | |
40 | bfd_vma memaddr; | |
41 | struct disassemble_info *info; | |
42 | { | |
43 | return print_insn_powerpc (memaddr, info, 1, | |
44 | PPC_OPCODE_PPC | PPC_OPCODE_601); | |
45 | } | |
46 | ||
47 | /* Print a little endian PowerPC instruction. For convenience, also | |
48 | disassemble instructions supported by the Motorola PowerPC 601. */ | |
49 | ||
50 | int | |
51 | print_insn_little_powerpc (memaddr, info) | |
52 | bfd_vma memaddr; | |
53 | struct disassemble_info *info; | |
54 | { | |
55 | return print_insn_powerpc (memaddr, info, 0, | |
56 | PPC_OPCODE_PPC | PPC_OPCODE_601); | |
57 | } | |
58 | ||
59 | /* Print a POWER (RS/6000) instruction. */ | |
60 | ||
61 | int | |
62 | print_insn_rs6000 (memaddr, info) | |
63 | bfd_vma memaddr; | |
64 | struct disassemble_info *info; | |
65 | { | |
66 | return print_insn_powerpc (memaddr, info, 1, PPC_OPCODE_POWER); | |
67 | } | |
68 | ||
69 | /* Print a PowerPC or POWER instruction. */ | |
70 | ||
71 | static int | |
72 | print_insn_powerpc (memaddr, info, bigendian, dialect) | |
73 | bfd_vma memaddr; | |
74 | struct disassemble_info *info; | |
75 | int bigendian; | |
76 | int dialect; | |
77 | { | |
78 | bfd_byte buffer[4]; | |
79 | int status; | |
80 | unsigned long insn; | |
81 | const struct powerpc_opcode *opcode; | |
82 | const struct powerpc_opcode *opcode_end; | |
83 | unsigned long op; | |
84 | ||
85 | status = (*info->read_memory_func) (memaddr, buffer, 4, info); | |
86 | if (status != 0) | |
87 | { | |
88 | (*info->memory_error_func) (status, memaddr, info); | |
89 | return -1; | |
90 | } | |
91 | ||
92 | if (bigendian) | |
93 | insn = bfd_getb32 (buffer); | |
94 | else | |
95 | insn = bfd_getl32 (buffer); | |
96 | ||
97 | /* Get the major opcode of the instruction. */ | |
98 | op = PPC_OP (insn); | |
99 | ||
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++) | |
104 | { | |
105 | unsigned long table_op; | |
106 | const unsigned char *opindex; | |
107 | const struct powerpc_operand *operand; | |
108 | int invalid; | |
109 | int need_comma; | |
110 | int need_paren; | |
111 | ||
112 | table_op = PPC_OP (opcode->opcode); | |
113 | if (op < table_op) | |
114 | break; | |
115 | if (op > table_op) | |
116 | continue; | |
117 | ||
118 | if ((insn & opcode->mask) != opcode->opcode | |
119 | || (opcode->flags & dialect) == 0) | |
120 | continue; | |
121 | ||
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. */ | |
125 | invalid = 0; | |
126 | for (opindex = opcode->operands; *opindex != 0; opindex++) | |
127 | { | |
128 | operand = powerpc_operands + *opindex; | |
129 | if (operand->extract) | |
130 | (*operand->extract) (insn, &invalid); | |
131 | } | |
132 | if (invalid) | |
133 | continue; | |
134 | ||
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"); | |
139 | ||
140 | /* Now extract and print the operands. */ | |
141 | need_comma = 0; | |
142 | need_paren = 0; | |
143 | for (opindex = opcode->operands; *opindex != 0; opindex++) | |
144 | { | |
145 | long value; | |
146 | ||
147 | operand = powerpc_operands + *opindex; | |
148 | ||
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) | |
153 | continue; | |
154 | ||
155 | /* Extract the value from the instruction. */ | |
156 | if (operand->extract) | |
157 | value = (*operand->extract) (insn, (int *) NULL); | |
158 | else | |
159 | { | |
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; | |
164 | } | |
165 | ||
166 | /* If the operand is optional, and the value is zero, don't | |
167 | print anything. */ | |
168 | if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0 | |
169 | && (operand->flags & PPC_OPERAND_NEXT) == 0 | |
170 | && value == 0) | |
171 | continue; | |
172 | ||
173 | if (need_comma) | |
174 | { | |
175 | (*info->fprintf_func) (info->stream, ","); | |
176 | need_comma = 0; | |
177 | } | |
178 | ||
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); | |
191 | else | |
192 | { | |
193 | if (operand->bits == 3) | |
194 | (*info->fprintf_func) (info->stream, "cr%d", value); | |
195 | else | |
196 | { | |
197 | static const char *cbnames[4] = { "lt", "gt", "eq", "so" }; | |
198 | int cr; | |
199 | int cc; | |
200 | ||
201 | cr = value >> 2; | |
202 | if (cr != 0) | |
203 | (*info->fprintf_func) (info->stream, "4*cr%d", cr); | |
204 | cc = value & 3; | |
205 | if (cc != 0) | |
206 | { | |
207 | if (cr != 0) | |
208 | (*info->fprintf_func) (info->stream, "+"); | |
209 | (*info->fprintf_func) (info->stream, "%s", cbnames[cc]); | |
210 | } | |
211 | } | |
212 | } | |
213 | ||
214 | if (need_paren) | |
215 | { | |
216 | (*info->fprintf_func) (info->stream, ")"); | |
217 | need_paren = 0; | |
218 | } | |
219 | ||
220 | if ((operand->flags & PPC_OPERAND_PARENS) == 0) | |
221 | need_comma = 1; | |
222 | else | |
223 | { | |
224 | (*info->fprintf_func) (info->stream, "("); | |
225 | need_paren = 1; | |
226 | } | |
227 | } | |
228 | ||
229 | /* We have found and printed an instruction; return. */ | |
230 | return 4; | |
231 | } | |
232 | ||
233 | /* We could not find a match. */ | |
234 | (*info->fprintf_func) (info->stream, ".long 0x%lx", insn); | |
235 | ||
236 | return 4; | |
237 | } |