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1da177e4 LT |
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 "nonstdio.h" | |
22 | #include "ansidecl.h" | |
23 | #include "ppc.h" | |
24 | ||
25 | static int print_insn_powerpc PARAMS ((FILE *, unsigned long insn, | |
26 | unsigned memaddr, int dialect)); | |
27 | ||
28 | extern void print_address PARAMS((unsigned memaddr)); | |
29 | ||
30 | /* Print a big endian PowerPC instruction. For convenience, also | |
31 | disassemble instructions supported by the Motorola PowerPC 601. */ | |
32 | ||
33 | int | |
34 | print_insn_big_powerpc (FILE *out, unsigned long insn, unsigned memaddr) | |
35 | { | |
36 | return print_insn_powerpc (out, insn, memaddr, | |
37 | PPC_OPCODE_PPC | PPC_OPCODE_601); | |
38 | } | |
39 | ||
40 | /* Print a PowerPC or POWER instruction. */ | |
41 | ||
42 | static int | |
43 | print_insn_powerpc (FILE *out, unsigned long insn, unsigned memaddr, | |
44 | int dialect) | |
45 | { | |
46 | const struct powerpc_opcode *opcode; | |
47 | const struct powerpc_opcode *opcode_end; | |
48 | unsigned long op; | |
49 | ||
50 | /* Get the major opcode of the instruction. */ | |
51 | op = PPC_OP (insn); | |
52 | ||
53 | /* Find the first match in the opcode table. We could speed this up | |
54 | a bit by doing a binary search on the major opcode. */ | |
55 | opcode_end = powerpc_opcodes + powerpc_num_opcodes; | |
56 | for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++) | |
57 | { | |
58 | unsigned long table_op; | |
59 | const unsigned char *opindex; | |
60 | const struct powerpc_operand *operand; | |
61 | int invalid; | |
62 | int need_comma; | |
63 | int need_paren; | |
64 | ||
65 | table_op = PPC_OP (opcode->opcode); | |
66 | if (op < table_op) | |
67 | break; | |
68 | if (op > table_op) | |
69 | continue; | |
70 | ||
71 | if ((insn & opcode->mask) != opcode->opcode | |
72 | || (opcode->flags & dialect) == 0) | |
73 | continue; | |
74 | ||
75 | /* Make two passes over the operands. First see if any of them | |
76 | have extraction functions, and, if they do, make sure the | |
77 | instruction is valid. */ | |
78 | invalid = 0; | |
79 | for (opindex = opcode->operands; *opindex != 0; opindex++) | |
80 | { | |
81 | operand = powerpc_operands + *opindex; | |
82 | if (operand->extract) | |
83 | (*operand->extract) (insn, &invalid); | |
84 | } | |
85 | if (invalid) | |
86 | continue; | |
87 | ||
88 | /* The instruction is valid. */ | |
89 | fprintf(out, "%s", opcode->name); | |
90 | if (opcode->operands[0] != 0) | |
91 | fprintf(out, "\t"); | |
92 | ||
93 | /* Now extract and print the operands. */ | |
94 | need_comma = 0; | |
95 | need_paren = 0; | |
96 | for (opindex = opcode->operands; *opindex != 0; opindex++) | |
97 | { | |
98 | long value; | |
99 | ||
100 | operand = powerpc_operands + *opindex; | |
101 | ||
102 | /* Operands that are marked FAKE are simply ignored. We | |
103 | already made sure that the extract function considered | |
104 | the instruction to be valid. */ | |
105 | if ((operand->flags & PPC_OPERAND_FAKE) != 0) | |
106 | continue; | |
107 | ||
108 | /* Extract the value from the instruction. */ | |
109 | if (operand->extract) | |
110 | value = (*operand->extract) (insn, (int *) 0); | |
111 | else | |
112 | { | |
113 | value = (insn >> operand->shift) & ((1 << operand->bits) - 1); | |
114 | if ((operand->flags & PPC_OPERAND_SIGNED) != 0 | |
115 | && (value & (1 << (operand->bits - 1))) != 0) | |
116 | value -= 1 << operand->bits; | |
117 | } | |
118 | ||
119 | /* If the operand is optional, and the value is zero, don't | |
120 | print anything. */ | |
121 | if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0 | |
122 | && (operand->flags & PPC_OPERAND_NEXT) == 0 | |
123 | && value == 0) | |
124 | continue; | |
125 | ||
126 | if (need_comma) | |
127 | { | |
128 | fprintf(out, ","); | |
129 | need_comma = 0; | |
130 | } | |
131 | ||
132 | /* Print the operand as directed by the flags. */ | |
133 | if ((operand->flags & PPC_OPERAND_GPR) != 0) | |
134 | fprintf(out, "r%ld", value); | |
135 | else if ((operand->flags & PPC_OPERAND_FPR) != 0) | |
136 | fprintf(out, "f%ld", value); | |
137 | else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0) | |
138 | print_address (memaddr + value); | |
139 | else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0) | |
140 | print_address (value & 0xffffffff); | |
141 | else if ((operand->flags & PPC_OPERAND_CR) == 0 | |
142 | || (dialect & PPC_OPCODE_PPC) == 0) | |
143 | fprintf(out, "%ld", value); | |
144 | else | |
145 | { | |
146 | if (operand->bits == 3) | |
147 | fprintf(out, "cr%d", value); | |
148 | else | |
149 | { | |
150 | static const char *cbnames[4] = { "lt", "gt", "eq", "so" }; | |
151 | int cr; | |
152 | int cc; | |
153 | ||
154 | cr = value >> 2; | |
155 | if (cr != 0) | |
156 | fprintf(out, "4*cr%d", cr); | |
157 | cc = value & 3; | |
158 | if (cc != 0) | |
159 | { | |
160 | if (cr != 0) | |
161 | fprintf(out, "+"); | |
162 | fprintf(out, "%s", cbnames[cc]); | |
163 | } | |
164 | } | |
165 | } | |
166 | ||
167 | if (need_paren) | |
168 | { | |
169 | fprintf(out, ")"); | |
170 | need_paren = 0; | |
171 | } | |
172 | ||
173 | if ((operand->flags & PPC_OPERAND_PARENS) == 0) | |
174 | need_comma = 1; | |
175 | else | |
176 | { | |
177 | fprintf(out, "("); | |
178 | need_paren = 1; | |
179 | } | |
180 | } | |
181 | ||
182 | /* We have found and printed an instruction; return. */ | |
183 | return 4; | |
184 | } | |
185 | ||
186 | /* We could not find a match. */ | |
187 | fprintf(out, ".long 0x%lx", insn); | |
188 | ||
189 | return 4; | |
190 | } |