2008-07-07 Stan Shebs <stan@codesourcery.com>
[binutils.git] / opcodes / alpha-dis.c
blobb702776371f52bd8804b0dfa37b05464c967a2c1
1 /* alpha-dis.c -- Disassemble Alpha AXP instructions
2 Copyright 1996, 1998, 1999, 2000, 2001, 2002, 2007
3 Free Software Foundation, Inc.
4 Contributed by Richard Henderson <rth@tamu.edu>,
5 patterned after the PPC opcode handling written by Ian Lance Taylor.
7 This file is part of libopcodes.
9 This library is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
12 any later version.
14 It is distributed in the hope that it will be useful, but WITHOUT
15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
17 License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this file; see the file COPYING. If not, write to the Free
21 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
22 02110-1301, USA. */
24 #include <stdio.h>
25 #include "sysdep.h"
26 #include "dis-asm.h"
27 #include "opcode/alpha.h"
29 /* OSF register names. */
31 static const char * const osf_regnames[64] = {
32 "v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6",
33 "t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp",
34 "a0", "a1", "a2", "a3", "a4", "a5", "t8", "t9",
35 "t10", "t11", "ra", "t12", "at", "gp", "sp", "zero",
36 "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7",
37 "$f8", "$f9", "$f10", "$f11", "$f12", "$f13", "$f14", "$f15",
38 "$f16", "$f17", "$f18", "$f19", "$f20", "$f21", "$f22", "$f23",
39 "$f24", "$f25", "$f26", "$f27", "$f28", "$f29", "$f30", "$f31"
42 /* VMS register names. */
44 static const char * const vms_regnames[64] = {
45 "R0", "R1", "R2", "R3", "R4", "R5", "R6", "R7",
46 "R8", "R9", "R10", "R11", "R12", "R13", "R14", "R15",
47 "R16", "R17", "R18", "R19", "R20", "R21", "R22", "R23",
48 "R24", "AI", "RA", "PV", "AT", "FP", "SP", "RZ",
49 "F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7",
50 "F8", "F9", "F10", "F11", "F12", "F13", "F14", "F15",
51 "F16", "F17", "F18", "F19", "F20", "F21", "F22", "F23",
52 "F24", "F25", "F26", "F27", "F28", "F29", "F30", "FZ"
55 /* Disassemble Alpha instructions. */
57 int
58 print_insn_alpha (memaddr, info)
59 bfd_vma memaddr;
60 struct disassemble_info *info;
62 static const struct alpha_opcode *opcode_index[AXP_NOPS+1];
63 const char * const * regnames;
64 const struct alpha_opcode *opcode, *opcode_end;
65 const unsigned char *opindex;
66 unsigned insn, op, isa_mask;
67 int need_comma;
69 /* Initialize the majorop table the first time through */
70 if (!opcode_index[0])
72 opcode = alpha_opcodes;
73 opcode_end = opcode + alpha_num_opcodes;
75 for (op = 0; op < AXP_NOPS; ++op)
77 opcode_index[op] = opcode;
78 while (opcode < opcode_end && op == AXP_OP (opcode->opcode))
79 ++opcode;
81 opcode_index[op] = opcode;
84 if (info->flavour == bfd_target_evax_flavour)
85 regnames = vms_regnames;
86 else
87 regnames = osf_regnames;
89 isa_mask = AXP_OPCODE_NOPAL;
90 switch (info->mach)
92 case bfd_mach_alpha_ev4:
93 isa_mask |= AXP_OPCODE_EV4;
94 break;
95 case bfd_mach_alpha_ev5:
96 isa_mask |= AXP_OPCODE_EV5;
97 break;
98 case bfd_mach_alpha_ev6:
99 isa_mask |= AXP_OPCODE_EV6;
100 break;
103 /* Read the insn into a host word */
105 bfd_byte buffer[4];
106 int status = (*info->read_memory_func) (memaddr, buffer, 4, info);
107 if (status != 0)
109 (*info->memory_error_func) (status, memaddr, info);
110 return -1;
112 insn = bfd_getl32 (buffer);
115 /* Get the major opcode of the instruction. */
116 op = AXP_OP (insn);
118 /* Find the first match in the opcode table. */
119 opcode_end = opcode_index[op + 1];
120 for (opcode = opcode_index[op]; opcode < opcode_end; ++opcode)
122 if ((insn ^ opcode->opcode) & opcode->mask)
123 continue;
125 if (!(opcode->flags & isa_mask))
126 continue;
128 /* Make two passes over the operands. First see if any of them
129 have extraction functions, and, if they do, make sure the
130 instruction is valid. */
132 int invalid = 0;
133 for (opindex = opcode->operands; *opindex != 0; opindex++)
135 const struct alpha_operand *operand = alpha_operands + *opindex;
136 if (operand->extract)
137 (*operand->extract) (insn, &invalid);
139 if (invalid)
140 continue;
143 /* The instruction is valid. */
144 goto found;
147 /* No instruction found */
148 (*info->fprintf_func) (info->stream, ".long %#08x", insn);
150 return 4;
152 found:
153 (*info->fprintf_func) (info->stream, "%s", opcode->name);
154 if (opcode->operands[0] != 0)
155 (*info->fprintf_func) (info->stream, "\t");
157 /* Now extract and print the operands. */
158 need_comma = 0;
159 for (opindex = opcode->operands; *opindex != 0; opindex++)
161 const struct alpha_operand *operand = alpha_operands + *opindex;
162 int value;
164 /* Operands that are marked FAKE are simply ignored. We
165 already made sure that the extract function considered
166 the instruction to be valid. */
167 if ((operand->flags & AXP_OPERAND_FAKE) != 0)
168 continue;
170 /* Extract the value from the instruction. */
171 if (operand->extract)
172 value = (*operand->extract) (insn, (int *) NULL);
173 else
175 value = (insn >> operand->shift) & ((1 << operand->bits) - 1);
176 if (operand->flags & AXP_OPERAND_SIGNED)
178 int signbit = 1 << (operand->bits - 1);
179 value = (value ^ signbit) - signbit;
183 if (need_comma &&
184 ((operand->flags & (AXP_OPERAND_PARENS | AXP_OPERAND_COMMA))
185 != AXP_OPERAND_PARENS))
187 (*info->fprintf_func) (info->stream, ",");
189 if (operand->flags & AXP_OPERAND_PARENS)
190 (*info->fprintf_func) (info->stream, "(");
192 /* Print the operand as directed by the flags. */
193 if (operand->flags & AXP_OPERAND_IR)
194 (*info->fprintf_func) (info->stream, "%s", regnames[value]);
195 else if (operand->flags & AXP_OPERAND_FPR)
196 (*info->fprintf_func) (info->stream, "%s", regnames[value + 32]);
197 else if (operand->flags & AXP_OPERAND_RELATIVE)
198 (*info->print_address_func) (memaddr + 4 + value, info);
199 else if (operand->flags & AXP_OPERAND_SIGNED)
200 (*info->fprintf_func) (info->stream, "%d", value);
201 else
202 (*info->fprintf_func) (info->stream, "%#x", value);
204 if (operand->flags & AXP_OPERAND_PARENS)
205 (*info->fprintf_func) (info->stream, ")");
206 need_comma = 1;
209 return 4;