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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 | extern void print_address (unsigned long memaddr); | |
26 | ||
27 | /* Print a PowerPC or POWER instruction. */ | |
28 | ||
29 | int | |
30 | print_insn_powerpc (unsigned long insn, unsigned long memaddr, int dialect) | |
31 | { | |
32 | const struct powerpc_opcode *opcode; | |
33 | const struct powerpc_opcode *opcode_end; | |
34 | unsigned long op; | |
35 | ||
36 | if (dialect == 0) | |
37 | dialect = PPC_OPCODE_PPC | PPC_OPCODE_CLASSIC | PPC_OPCODE_COMMON | |
38 | | PPC_OPCODE_64 | PPC_OPCODE_POWER4 | PPC_OPCODE_ALTIVEC; | |
39 | ||
40 | /* Get the major opcode of the instruction. */ | |
41 | op = PPC_OP (insn); | |
42 | ||
43 | /* Find the first match in the opcode table. We could speed this up | |
44 | a bit by doing a binary search on the major opcode. */ | |
45 | opcode_end = powerpc_opcodes + powerpc_num_opcodes; | |
46 | again: | |
47 | for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++) | |
48 | { | |
49 | unsigned long table_op; | |
50 | const unsigned char *opindex; | |
51 | const struct powerpc_operand *operand; | |
52 | int invalid; | |
53 | int need_comma; | |
54 | int need_paren; | |
55 | ||
56 | table_op = PPC_OP (opcode->opcode); | |
57 | if (op < table_op) | |
58 | break; | |
59 | if (op > table_op) | |
60 | continue; | |
61 | ||
62 | if ((insn & opcode->mask) != opcode->opcode | |
63 | || (opcode->flags & dialect) == 0) | |
64 | continue; | |
65 | ||
66 | /* Make two passes over the operands. First see if any of them | |
67 | have extraction functions, and, if they do, make sure the | |
68 | instruction is valid. */ | |
69 | invalid = 0; | |
70 | for (opindex = opcode->operands; *opindex != 0; opindex++) | |
71 | { | |
72 | operand = powerpc_operands + *opindex; | |
73 | if (operand->extract) | |
74 | (*operand->extract) (insn, dialect, &invalid); | |
75 | } | |
76 | if (invalid) | |
77 | continue; | |
78 | ||
79 | /* The instruction is valid. */ | |
80 | printf("%s", opcode->name); | |
81 | if (opcode->operands[0] != 0) | |
82 | printf("\t"); | |
83 | ||
84 | /* Now extract and print the operands. */ | |
85 | need_comma = 0; | |
86 | need_paren = 0; | |
87 | for (opindex = opcode->operands; *opindex != 0; opindex++) | |
88 | { | |
89 | long value; | |
90 | ||
91 | operand = powerpc_operands + *opindex; | |
92 | ||
93 | /* Operands that are marked FAKE are simply ignored. We | |
94 | already made sure that the extract function considered | |
95 | the instruction to be valid. */ | |
96 | if ((operand->flags & PPC_OPERAND_FAKE) != 0) | |
97 | continue; | |
98 | ||
99 | /* Extract the value from the instruction. */ | |
100 | if (operand->extract) | |
101 | value = (*operand->extract) (insn, dialect, &invalid); | |
102 | else | |
103 | { | |
104 | value = (insn >> operand->shift) & ((1 << operand->bits) - 1); | |
105 | if ((operand->flags & PPC_OPERAND_SIGNED) != 0 | |
106 | && (value & (1 << (operand->bits - 1))) != 0) | |
107 | value -= 1 << operand->bits; | |
108 | } | |
109 | ||
110 | /* If the operand is optional, and the value is zero, don't | |
111 | print anything. */ | |
112 | if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0 | |
113 | && (operand->flags & PPC_OPERAND_NEXT) == 0 | |
114 | && value == 0) | |
115 | continue; | |
116 | ||
117 | if (need_comma) | |
118 | { | |
119 | printf(","); | |
120 | need_comma = 0; | |
121 | } | |
122 | ||
123 | /* Print the operand as directed by the flags. */ | |
124 | if ((operand->flags & PPC_OPERAND_GPR) != 0) | |
125 | printf("r%ld", value); | |
126 | else if ((operand->flags & PPC_OPERAND_FPR) != 0) | |
127 | printf("f%ld", value); | |
128 | else if ((operand->flags & PPC_OPERAND_VR) != 0) | |
129 | printf("v%ld", value); | |
130 | else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0) | |
131 | print_address (memaddr + value); | |
132 | else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0) | |
133 | print_address (value & 0xffffffff); | |
134 | else if ((operand->flags & PPC_OPERAND_CR) == 0 | |
135 | || (dialect & PPC_OPCODE_PPC) == 0) | |
136 | printf("%ld", value); | |
137 | else | |
138 | { | |
139 | if (operand->bits == 3) | |
140 | printf("cr%d", value); | |
141 | else | |
142 | { | |
143 | static const char *cbnames[4] = { "lt", "gt", "eq", "so" }; | |
144 | int cr; | |
145 | int cc; | |
146 | ||
147 | cr = value >> 2; | |
148 | if (cr != 0) | |
149 | printf("4*cr%d+", cr); | |
150 | cc = value & 3; | |
151 | printf("%s", cbnames[cc]); | |
152 | } | |
153 | } | |
154 | ||
155 | if (need_paren) | |
156 | { | |
157 | printf(")"); | |
158 | need_paren = 0; | |
159 | } | |
160 | ||
161 | if ((operand->flags & PPC_OPERAND_PARENS) == 0) | |
162 | need_comma = 1; | |
163 | else | |
164 | { | |
165 | printf("("); | |
166 | need_paren = 1; | |
167 | } | |
168 | } | |
169 | ||
170 | /* We have found and printed an instruction; return. */ | |
171 | return 4; | |
172 | } | |
173 | ||
174 | if ((dialect & PPC_OPCODE_ANY) != 0) | |
175 | { | |
176 | dialect = ~PPC_OPCODE_ANY; | |
177 | goto again; | |
178 | } | |
179 | ||
180 | /* We could not find a match. */ | |
181 | printf(".long 0x%lx", insn); | |
182 | ||
183 | return 4; | |
184 | } |