1 /* Instruction printing code for the AMD 29000
2 Copyright (C) 1990 Free Software Foundation, Inc.
3 Contributed by Cygnus Support. Written by Jim Kingdon.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
22 #include "opcode/a29k.h"
24 /* Print a symbolic representation of a general-purpose
25 register number NUM on STREAM.
26 NUM is a number as found in the instruction, not as found in
27 debugging symbols; it must be in the range 0-255. */
29 print_general (num
, info
)
31 struct disassemble_info
*info
;
34 (*info
->fprintf_func
) (info
->stream
, "gr%d", num
);
36 (*info
->fprintf_func
) (info
->stream
, "lr%d", num
- 128);
39 /* Like print_general but a special-purpose register.
41 The mnemonics used by the AMD assembler are not quite the same
42 as the ones in the User's Manual. We use the ones that the
45 print_special (num
, info
)
47 struct disassemble_info
*info
;
49 /* Register names of registers 0-SPEC0_NUM-1. */
50 static char *spec0_names
[] = {
51 "vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr",
52 "pc0", "pc1", "pc2", "mmu", "lru"
54 #define SPEC0_NUM ((sizeof spec0_names) / (sizeof spec0_names[0]))
56 /* Register names of registers 128-128+SPEC128_NUM-1. */
57 static char *spec128_names
[] = {
58 "ipc", "ipa", "ipb", "q", "alu", "bp", "fc", "cr"
60 #define SPEC128_NUM ((sizeof spec128_names) / (sizeof spec128_names[0]))
62 /* Register names of registers 160-160+SPEC160_NUM-1. */
63 static char *spec160_names
[] = {
64 "fpe", "inte", "fps", "sr163", "exop"
66 #define SPEC160_NUM ((sizeof spec160_names) / (sizeof spec160_names[0]))
69 (*info
->fprintf_func
) (info
->stream
, spec0_names
[num
]);
70 else if (num
>= 128 && num
< 128 + SPEC128_NUM
)
71 (*info
->fprintf_func
) (info
->stream
, spec128_names
[num
-128]);
72 else if (num
>= 160 && num
< 160 + SPEC160_NUM
)
73 (*info
->fprintf_func
) (info
->stream
, spec160_names
[num
-160]);
75 (*info
->fprintf_func
) (info
->stream
, "sr%d", num
);
78 /* Is an instruction with OPCODE a delayed branch? */
80 is_delayed_branch (opcode
)
83 return (opcode
== 0xa8 || opcode
== 0xa9 || opcode
== 0xa0 || opcode
== 0xa1
84 || opcode
== 0xa4 || opcode
== 0xa5
85 || opcode
== 0xb4 || opcode
== 0xb5
86 || opcode
== 0xc4 || opcode
== 0xc0
87 || opcode
== 0xac || opcode
== 0xad
91 /* Now find the four bytes of INSN and put them in *INSN{0,8,16,24}. */
93 find_bytes_big (insn
, insn0
, insn8
, insn16
, insn24
)
97 unsigned char *insn16
;
98 unsigned char *insn24
;
107 find_bytes_little (insn
, insn0
, insn8
, insn16
, insn24
)
109 unsigned char *insn0
;
110 unsigned char *insn8
;
111 unsigned char *insn16
;
112 unsigned char *insn24
;
120 typedef (*find_byte_func_type
)
121 PARAMS ((char *, unsigned char *, unsigned char *,
122 unsigned char *, unsigned char *));
124 /* Print one instruction from MEMADDR on INFO->STREAM.
125 Return the size of the instruction (always 4 on a29k). */
128 print_insn (memaddr
, info
)
130 struct disassemble_info
*info
;
132 /* The raw instruction. */
135 /* The four bytes of the instruction. */
136 unsigned char insn24
, insn16
, insn8
, insn0
;
138 find_byte_func_type find_byte_func
= (find_byte_func_type
)info
->private_data
;
140 struct a29k_opcode CONST
* opcode
;
144 (*info
->read_memory_func
) (memaddr
, (bfd_byte
*) &insn
[0], 4, info
);
147 (*info
->memory_error_func
) (status
, memaddr
, info
);
152 (*find_byte_func
) (insn
, &insn0
, &insn8
, &insn16
, &insn24
);
154 /* Handle the nop (aseq 0x40,gr1,gr1) specially */
155 if ((insn24
==0x70) && (insn16
==0x40) && (insn8
==0x01) && (insn0
==0x01)) {
156 (*info
->fprintf_func
) (info
->stream
,"nop");
160 /* The opcode is always in insn24. */
161 for (opcode
= &a29k_opcodes
[0];
162 opcode
< &a29k_opcodes
[num_opcodes
];
165 if ((insn24
<<24) == opcode
->opcode
)
169 (*info
->fprintf_func
) (info
->stream
, "%s ", opcode
->name
);
170 for (s
= opcode
->args
; *s
!= '\0'; ++s
)
175 print_general (insn8
, info
);
179 print_general (insn0
, info
);
183 print_general (insn16
, info
);
187 (*info
->fprintf_func
) (info
->stream
, "%d", insn0
);
191 (*info
->fprintf_func
) (info
->stream
, "%d", (insn16
<< 8) + insn0
);
195 /* This used to be %x for binutils. */
196 (*info
->fprintf_func
) (info
->stream
, "0x%x",
197 (insn16
<< 24) + (insn0
<< 16));
201 (*info
->fprintf_func
) (info
->stream
, "%d",
202 ((insn16
<< 8) + insn0
) | 0xffff0000);
206 /* This output looks just like absolute addressing, but
207 maybe that's OK (it's what the GDB m68k and EBMON
208 a29k disassemblers do). */
209 /* All the shifting is to sign-extend it. p*/
210 (*info
->print_address_func
)
212 (((int)((insn16
<< 10) + (insn0
<< 2)) << 14) >> 14),
217 (*info
->print_address_func
)
218 ((insn16
<< 10) + (insn0
<< 2), info
);
222 (*info
->fprintf_func
) (info
->stream
, "%d", insn16
>> 7);
226 (*info
->fprintf_func
) (info
->stream
, "0x%x", insn16
& 0x7f);
230 (*info
->fprintf_func
) (info
->stream
, "0x%x", insn16
);
234 print_special (insn8
, info
);
238 (*info
->fprintf_func
) (info
->stream
, "%d", insn0
>> 7);
242 (*info
->fprintf_func
) (info
->stream
, "%d", (insn0
>> 4) & 7);
246 (*info
->fprintf_func
) (info
->stream
, "%d", (insn0
>> 2) & 3);
250 (*info
->fprintf_func
) (info
->stream
, "%d", insn0
& 3);
254 (*info
->fprintf_func
) (info
->stream
, "%d", (insn16
>> 2) & 15);
258 (*info
->fprintf_func
) (info
->stream
, "%d", insn16
& 3);
262 (*info
->fprintf_func
) (info
->stream
, "%c", *s
);
266 /* Now we look for a const,consth pair of instructions,
267 in which case we try to print the symbolic address. */
268 if (insn24
== 2) /* consth */
272 unsigned char prev_insn0
, prev_insn8
, prev_insn16
, prev_insn24
;
274 errcode
= (*info
->read_memory_func
) (memaddr
- 4,
275 (bfd_byte
*) &prev_insn
[0],
280 /* If it is a delayed branch, we need to look at the
281 instruction before the delayed brach to handle
288 (*find_byte_func
) (prev_insn
, &prev_insn0
, &prev_insn8
,
289 &prev_insn16
, &prev_insn24
);
290 if (is_delayed_branch (prev_insn24
))
292 errcode
= (*info
->read_memory_func
)
293 (memaddr
- 8, (bfd_byte
*) &prev_insn
[0], 4, info
);
294 (*find_byte_func
) (prev_insn
, &prev_insn0
, &prev_insn8
,
295 &prev_insn16
, &prev_insn24
);
299 /* If there was a problem reading memory, then assume
300 the previous instruction was not const. */
303 /* Is it const to the same register? */
305 && prev_insn8
== insn8
)
307 (*info
->fprintf_func
) (info
->stream
, "\t; ");
308 (*info
->print_address_func
)
309 (((insn16
<< 24) + (insn0
<< 16)
310 + (prev_insn16
<< 8) + (prev_insn0
)),
319 /* This used to be %8x for binutils. */
320 (*info
->fprintf_func
)
321 (info
->stream
, ".word 0x%08x",
322 (insn24
<< 24) + (insn16
<< 16) + (insn8
<< 8) + insn0
);
326 /* Disassemble an big-endian a29k instruction. */
328 print_insn_big_a29k (memaddr
, info
)
330 struct disassemble_info
*info
;
332 info
->private_data
= (PTR
) find_bytes_big
;
333 return print_insn (memaddr
, info
);
336 /* Disassemble a little-endian a29k instruction. */
338 print_insn_little_a29k (memaddr
, info
)
340 struct disassemble_info
*info
;
342 info
->private_data
= (PTR
) find_bytes_little
;
343 return print_insn (memaddr
, info
);