1 /* alpha-dis.c -- Disassemble Alpha AXP instructions
2 Copyright (C) 1996-2014 Free Software Foundation, Inc.
3 Contributed by Richard Henderson <rth@tamu.edu>,
4 patterned after the PPC opcode handling written by Ian Lance Taylor.
5
6 This file is part of libopcodes.
7
8 This library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
11 any later version.
12
13 It is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
16 License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this file; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include <stdio.h>
25 #include "dis-asm.h"
26 #include "opcode/alpha.h"
27
28 /* OSF register names. */
29
30 static const char * const osf_regnames[64] = {
31 "v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6",
32 "t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp",
33 "a0", "a1", "a2", "a3", "a4", "a5", "t8", "t9",
34 "t10", "t11", "ra", "t12", "at", "gp", "sp", "zero",
35 "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7",
36 "$f8", "$f9", "$f10", "$f11", "$f12", "$f13", "$f14", "$f15",
37 "$f16", "$f17", "$f18", "$f19", "$f20", "$f21", "$f22", "$f23",
38 "$f24", "$f25", "$f26", "$f27", "$f28", "$f29", "$f30", "$f31"
39 };
40
41 /* VMS register names. */
42
43 static const char * const vms_regnames[64] = {
44 "R0", "R1", "R2", "R3", "R4", "R5", "R6", "R7",
45 "R8", "R9", "R10", "R11", "R12", "R13", "R14", "R15",
46 "R16", "R17", "R18", "R19", "R20", "R21", "R22", "R23",
47 "R24", "AI", "RA", "PV", "AT", "FP", "SP", "RZ",
48 "F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7",
49 "F8", "F9", "F10", "F11", "F12", "F13", "F14", "F15",
50 "F16", "F17", "F18", "F19", "F20", "F21", "F22", "F23",
51 "F24", "F25", "F26", "F27", "F28", "F29", "F30", "FZ"
52 };
53
54 /* Disassemble Alpha instructions. */
55
56 int
print_insn_alpha(memaddr,info)57 print_insn_alpha (memaddr, info)
58 bfd_vma memaddr;
59 struct disassemble_info *info;
60 {
61 static const struct alpha_opcode *opcode_index[AXP_NOPS+1];
62 const char * const * regnames;
63 const struct alpha_opcode *opcode, *opcode_end;
64 const unsigned char *opindex;
65 unsigned insn, op, isa_mask;
66 int need_comma;
67
68 /* Initialize the majorop table the first time through */
69 if (!opcode_index[0])
70 {
71 opcode = alpha_opcodes;
72 opcode_end = opcode + alpha_num_opcodes;
73
74 for (op = 0; op < AXP_NOPS; ++op)
75 {
76 opcode_index[op] = opcode;
77 while (opcode < opcode_end && op == AXP_OP (opcode->opcode))
78 ++opcode;
79 }
80 opcode_index[op] = opcode;
81 }
82
83 if (info->flavour == bfd_target_evax_flavour)
84 regnames = vms_regnames;
85 else
86 regnames = osf_regnames;
87
88 isa_mask = AXP_OPCODE_NOPAL;
89 switch (info->mach)
90 {
91 case bfd_mach_alpha_ev4:
92 isa_mask |= AXP_OPCODE_EV4;
93 break;
94 case bfd_mach_alpha_ev5:
95 isa_mask |= AXP_OPCODE_EV5;
96 break;
97 case bfd_mach_alpha_ev6:
98 isa_mask |= AXP_OPCODE_EV6;
99 break;
100 }
101
102 /* Read the insn into a host word */
103 {
104 bfd_byte buffer[4];
105 int status = (*info->read_memory_func) (memaddr, buffer, 4, info);
106 if (status != 0)
107 {
108 (*info->memory_error_func) (status, memaddr, info);
109 return -1;
110 }
111 insn = bfd_getl32 (buffer);
112 }
113
114 /* Get the major opcode of the instruction. */
115 op = AXP_OP (insn);
116
117 /* Find the first match in the opcode table. */
118 opcode_end = opcode_index[op + 1];
119 for (opcode = opcode_index[op]; opcode < opcode_end; ++opcode)
120 {
121 if ((insn ^ opcode->opcode) & opcode->mask)
122 continue;
123
124 if (!(opcode->flags & isa_mask))
125 continue;
126
127 /* Make two passes over the operands. First see if any of them
128 have extraction functions, and, if they do, make sure the
129 instruction is valid. */
130 {
131 int invalid = 0;
132 for (opindex = opcode->operands; *opindex != 0; opindex++)
133 {
134 const struct alpha_operand *operand = alpha_operands + *opindex;
135 if (operand->extract)
136 (*operand->extract) (insn, &invalid);
137 }
138 if (invalid)
139 continue;
140 }
141
142 /* The instruction is valid. */
143 goto found;
144 }
145
146 /* No instruction found */
147 (*info->fprintf_func) (info->stream, ".long %#08x", insn);
148
149 return 4;
150
151 found:
152 (*info->fprintf_func) (info->stream, "%s", opcode->name);
153 if (opcode->operands[0] != 0)
154 (*info->fprintf_func) (info->stream, "\t");
155
156 /* Now extract and print the operands. */
157 need_comma = 0;
158 for (opindex = opcode->operands; *opindex != 0; opindex++)
159 {
160 const struct alpha_operand *operand = alpha_operands + *opindex;
161 int value;
162
163 /* Operands that are marked FAKE are simply ignored. We
164 already made sure that the extract function considered
165 the instruction to be valid. */
166 if ((operand->flags & AXP_OPERAND_FAKE) != 0)
167 continue;
168
169 /* Extract the value from the instruction. */
170 if (operand->extract)
171 value = (*operand->extract) (insn, (int *) NULL);
172 else
173 {
174 value = (insn >> operand->shift) & ((1 << operand->bits) - 1);
175 if (operand->flags & AXP_OPERAND_SIGNED)
176 {
177 int signbit = 1 << (operand->bits - 1);
178 value = (value ^ signbit) - signbit;
179 }
180 }
181
182 if (need_comma &&
183 ((operand->flags & (AXP_OPERAND_PARENS | AXP_OPERAND_COMMA))
184 != AXP_OPERAND_PARENS))
185 {
186 (*info->fprintf_func) (info->stream, ",");
187 }
188 if (operand->flags & AXP_OPERAND_PARENS)
189 (*info->fprintf_func) (info->stream, "(");
190
191 /* Print the operand as directed by the flags. */
192 if (operand->flags & AXP_OPERAND_IR)
193 (*info->fprintf_func) (info->stream, "%s", regnames[value]);
194 else if (operand->flags & AXP_OPERAND_FPR)
195 (*info->fprintf_func) (info->stream, "%s", regnames[value + 32]);
196 else if (operand->flags & AXP_OPERAND_RELATIVE)
197 (*info->print_address_func) (memaddr + 4 + value, info);
198 else if (operand->flags & AXP_OPERAND_SIGNED)
199 (*info->fprintf_func) (info->stream, "%d", value);
200 else
201 (*info->fprintf_func) (info->stream, "%#x", value);
202
203 if (operand->flags & AXP_OPERAND_PARENS)
204 (*info->fprintf_func) (info->stream, ")");
205 need_comma = 1;
206 }
207
208 return 4;
209 }
210