1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
|
/* ppc-dis.c -- Disassemble PowerPC instructions
Copyright (C) 1994-2016 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Cygnus Support
This file is part of GDB, GAS, and the GNU binutils.
GDB, GAS, and the GNU binutils are free software; you can redistribute
them and/or modify them under the terms of the GNU General Public
License as published by the Free Software Foundation; either version
2, or (at your option) any later version.
GDB, GAS, and the GNU binutils are distributed in the hope that they
will be useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this file; see the file COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
#include <asm/cputable.h>
#include <asm/cpu_has_feature.h>
#include "nonstdio.h"
#include "ansidecl.h"
#include "ppc.h"
#include "dis-asm.h"
/* This file provides several disassembler functions, all of which use
the disassembler interface defined in dis-asm.h. Several functions
are provided because this file handles disassembly for the PowerPC
in both big and little endian mode and also for the POWER (RS/6000)
chip. */
/* Extract the operand value from the PowerPC or POWER instruction. */
static long
operand_value_powerpc (const struct powerpc_operand *operand,
unsigned long insn, ppc_cpu_t dialect)
{
long value;
int invalid;
/* Extract the value from the instruction. */
if (operand->extract)
value = (*operand->extract) (insn, dialect, &invalid);
else
{
if (operand->shift >= 0)
value = (insn >> operand->shift) & operand->bitm;
else
value = (insn << -operand->shift) & operand->bitm;
if ((operand->flags & PPC_OPERAND_SIGNED) != 0)
{
/* BITM is always some number of zeros followed by some
number of ones, followed by some number of zeros. */
unsigned long top = operand->bitm;
/* top & -top gives the rightmost 1 bit, so this
fills in any trailing zeros. */
top |= (top & -top) - 1;
top &= ~(top >> 1);
value = (value ^ top) - top;
}
}
return value;
}
/* Determine whether the optional operand(s) should be printed. */
static int
skip_optional_operands (const unsigned char *opindex,
unsigned long insn, ppc_cpu_t dialect)
{
const struct powerpc_operand *operand;
for (; *opindex != 0; opindex++)
{
operand = &powerpc_operands[*opindex];
if ((operand->flags & PPC_OPERAND_NEXT) != 0
|| ((operand->flags & PPC_OPERAND_OPTIONAL) != 0
&& operand_value_powerpc (operand, insn, dialect) !=
ppc_optional_operand_value (operand)))
return 0;
}
return 1;
}
/* Find a match for INSN in the opcode table, given machine DIALECT.
A DIALECT of -1 is special, matching all machine opcode variations. */
static const struct powerpc_opcode *
lookup_powerpc (unsigned long insn, ppc_cpu_t dialect)
{
const struct powerpc_opcode *opcode;
const struct powerpc_opcode *opcode_end;
unsigned long op;
/* Get the major opcode of the instruction. */
op = PPC_OP (insn);
opcode_end = powerpc_opcodes + powerpc_num_opcodes;
/* Find the first match in the opcode table for this major opcode. */
for (opcode = powerpc_opcodes; opcode < opcode_end; ++opcode)
{
const unsigned char *opindex;
const struct powerpc_operand *operand;
int invalid;
if ((insn & opcode->mask) != opcode->opcode
|| (dialect != (ppc_cpu_t) -1
&& ((opcode->flags & dialect) == 0
|| (opcode->deprecated & dialect) != 0)))
continue;
/* Check validity of operands. */
invalid = 0;
for (opindex = opcode->operands; *opindex != 0; opindex++)
{
operand = powerpc_operands + *opindex;
if (operand->extract)
(*operand->extract) (insn, dialect, &invalid);
}
if (invalid)
continue;
return opcode;
}
return NULL;
}
/* Print a PowerPC or POWER instruction. */
int print_insn_powerpc (unsigned long insn, unsigned long memaddr)
{
const struct powerpc_opcode *opcode;
bool insn_is_short;
ppc_cpu_t dialect;
dialect = PPC_OPCODE_PPC | PPC_OPCODE_COMMON
| PPC_OPCODE_64 | PPC_OPCODE_POWER4 | PPC_OPCODE_ALTIVEC;
if (cpu_has_feature(CPU_FTRS_POWER5))
dialect |= PPC_OPCODE_POWER5;
if (cpu_has_feature(CPU_FTRS_CELL))
dialect |= (PPC_OPCODE_CELL | PPC_OPCODE_ALTIVEC);
if (cpu_has_feature(CPU_FTRS_POWER6))
dialect |= (PPC_OPCODE_POWER5 | PPC_OPCODE_POWER6 | PPC_OPCODE_ALTIVEC);
if (cpu_has_feature(CPU_FTRS_POWER7))
dialect |= (PPC_OPCODE_POWER5 | PPC_OPCODE_POWER6 | PPC_OPCODE_POWER7
| PPC_OPCODE_ALTIVEC | PPC_OPCODE_VSX);
if (cpu_has_feature(CPU_FTRS_POWER8))
dialect |= (PPC_OPCODE_POWER5 | PPC_OPCODE_POWER6 | PPC_OPCODE_POWER7
| PPC_OPCODE_POWER8 | PPC_OPCODE_HTM
| PPC_OPCODE_ALTIVEC | PPC_OPCODE_ALTIVEC2 | PPC_OPCODE_VSX);
if (cpu_has_feature(CPU_FTRS_POWER9))
dialect |= (PPC_OPCODE_POWER5 | PPC_OPCODE_POWER6 | PPC_OPCODE_POWER7
| PPC_OPCODE_POWER8 | PPC_OPCODE_POWER9 | PPC_OPCODE_HTM
| PPC_OPCODE_ALTIVEC | PPC_OPCODE_ALTIVEC2
| PPC_OPCODE_VSX | PPC_OPCODE_VSX3),
/* Get the major opcode of the insn. */
opcode = NULL;
insn_is_short = false;
if (opcode == NULL)
opcode = lookup_powerpc (insn, dialect);
if (opcode == NULL && (dialect & PPC_OPCODE_ANY) != 0)
opcode = lookup_powerpc (insn, (ppc_cpu_t) -1);
if (opcode != NULL)
{
const unsigned char *opindex;
const struct powerpc_operand *operand;
int need_comma;
int need_paren;
int skip_optional;
if (opcode->operands[0] != 0)
printf("%-7s ", opcode->name);
else
printf("%s", opcode->name);
if (insn_is_short)
/* The operands will be fetched out of the 16-bit instruction. */
insn >>= 16;
/* Now extract and print the operands. */
need_comma = 0;
need_paren = 0;
skip_optional = -1;
for (opindex = opcode->operands; *opindex != 0; opindex++)
{
long value;
operand = powerpc_operands + *opindex;
/* Operands that are marked FAKE are simply ignored. We
already made sure that the extract function considered
the instruction to be valid. */
if ((operand->flags & PPC_OPERAND_FAKE) != 0)
continue;
/* If all of the optional operands have the value zero,
then don't print any of them. */
if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0)
{
if (skip_optional < 0)
skip_optional = skip_optional_operands (opindex, insn,
dialect);
if (skip_optional)
continue;
}
value = operand_value_powerpc (operand, insn, dialect);
if (need_comma)
{
printf(",");
need_comma = 0;
}
/* Print the operand as directed by the flags. */
if ((operand->flags & PPC_OPERAND_GPR) != 0
|| ((operand->flags & PPC_OPERAND_GPR_0) != 0 && value != 0))
printf("r%ld", value);
else if ((operand->flags & PPC_OPERAND_FPR) != 0)
printf("f%ld", value);
else if ((operand->flags & PPC_OPERAND_VR) != 0)
printf("v%ld", value);
else if ((operand->flags & PPC_OPERAND_VSR) != 0)
printf("vs%ld", value);
else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0)
print_address(memaddr + value);
else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0)
print_address(value & 0xffffffff);
else if ((operand->flags & PPC_OPERAND_FSL) != 0)
printf("fsl%ld", value);
else if ((operand->flags & PPC_OPERAND_FCR) != 0)
printf("fcr%ld", value);
else if ((operand->flags & PPC_OPERAND_UDI) != 0)
printf("%ld", value);
else if ((operand->flags & PPC_OPERAND_CR_REG) != 0
&& (((dialect & PPC_OPCODE_PPC) != 0)
|| ((dialect & PPC_OPCODE_VLE) != 0)))
printf("cr%ld", value);
else if (((operand->flags & PPC_OPERAND_CR_BIT) != 0)
&& (((dialect & PPC_OPCODE_PPC) != 0)
|| ((dialect & PPC_OPCODE_VLE) != 0)))
{
static const char *cbnames[4] = { "lt", "gt", "eq", "so" };
int cr;
int cc;
cr = value >> 2;
if (cr != 0)
printf("4*cr%d+", cr);
cc = value & 3;
printf("%s", cbnames[cc]);
}
else
printf("%d", (int) value);
if (need_paren)
{
printf(")");
need_paren = 0;
}
if ((operand->flags & PPC_OPERAND_PARENS) == 0)
need_comma = 1;
else
{
printf("(");
need_paren = 1;
}
}
/* We have found and printed an instruction.
If it was a short VLE instruction we have more to do. */
if (insn_is_short)
{
memaddr += 2;
return 2;
}
else
/* Otherwise, return. */
return 4;
}
/* We could not find a match. */
printf(".long 0x%lx", insn);
return 4;
}
|
