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m68k.c
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m68k.c
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/* This file is composed of several different files from the upstream
sourceware.org CVS. Original file boundaries marked with **** */
#include <string.h>
#include <math.h>
#include <stdio.h>
#include "disas/bfd.h"
/* **** floatformat.h from sourceware.org CVS 2005-08-14. */
/* IEEE floating point support declarations, for GDB, the GNU Debugger.
Copyright 1991, 1994, 1995, 1997, 2000, 2003 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it 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 program; if not, see <http://www.gnu.org/licenses/>. */
#if !defined (FLOATFORMAT_H)
#define FLOATFORMAT_H 1
/*#include "ansidecl.h" */
/* A floatformat consists of a sign bit, an exponent and a mantissa. Once the
bytes are concatenated according to the byteorder flag, then each of those
fields is contiguous. We number the bits with 0 being the most significant
(i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field
contains with the *_start and *_len fields. */
/* What is the order of the bytes. */
enum floatformat_byteorders {
/* Standard little endian byte order.
EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */
floatformat_little,
/* Standard big endian byte order.
EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */
floatformat_big,
/* Little endian byte order but big endian word order.
EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */
floatformat_littlebyte_bigword
};
enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no };
struct floatformat
{
enum floatformat_byteorders byteorder;
unsigned int totalsize; /* Total size of number in bits */
/* Sign bit is always one bit long. 1 means negative, 0 means positive. */
unsigned int sign_start;
unsigned int exp_start;
unsigned int exp_len;
/* Bias added to a "true" exponent to form the biased exponent. It
is intentionally signed as, otherwize, -exp_bias can turn into a
very large number (e.g., given the exp_bias of 0x3fff and a 64
bit long, the equation (long)(1 - exp_bias) evaluates to
4294950914) instead of -16382). */
int exp_bias;
/* Exponent value which indicates NaN. This is the actual value stored in
the float, not adjusted by the exp_bias. This usually consists of all
one bits. */
unsigned int exp_nan;
unsigned int man_start;
unsigned int man_len;
/* Is the integer bit explicit or implicit? */
enum floatformat_intbit intbit;
/* Internal name for debugging. */
const char *name;
/* Validator method. */
int (*is_valid) (const struct floatformat *fmt, const char *from);
};
/* floatformats for IEEE single and double, big and little endian. */
extern const struct floatformat floatformat_ieee_single_big;
extern const struct floatformat floatformat_ieee_single_little;
extern const struct floatformat floatformat_ieee_double_big;
extern const struct floatformat floatformat_ieee_double_little;
/* floatformat for ARM IEEE double, little endian bytes and big endian words */
extern const struct floatformat floatformat_ieee_double_littlebyte_bigword;
/* floatformats for various extendeds. */
extern const struct floatformat floatformat_i387_ext;
extern const struct floatformat floatformat_m68881_ext;
extern const struct floatformat floatformat_i960_ext;
extern const struct floatformat floatformat_m88110_ext;
extern const struct floatformat floatformat_m88110_harris_ext;
extern const struct floatformat floatformat_arm_ext_big;
extern const struct floatformat floatformat_arm_ext_littlebyte_bigword;
/* IA-64 Floating Point register spilt into memory. */
extern const struct floatformat floatformat_ia64_spill_big;
extern const struct floatformat floatformat_ia64_spill_little;
extern const struct floatformat floatformat_ia64_quad_big;
extern const struct floatformat floatformat_ia64_quad_little;
/* Convert from FMT to a double.
FROM is the address of the extended float.
Store the double in *TO. */
extern void
floatformat_to_double (const struct floatformat *, const char *, double *);
/* The converse: convert the double *FROM to FMT
and store where TO points. */
extern void
floatformat_from_double (const struct floatformat *, const double *, char *);
/* Return non-zero iff the data at FROM is a valid number in format FMT. */
extern int
floatformat_is_valid (const struct floatformat *fmt, const char *from);
#endif /* defined (FLOATFORMAT_H) */
/* **** End of floatformat.h */
/* **** m68k-dis.h from sourceware.org CVS 2005-08-14. */
/* Opcode table header for m680[01234]0/m6888[12]/m68851.
Copyright 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2001,
2003, 2004 Free Software Foundation, Inc.
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
1, 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,
see <http://www.gnu.org/licenses/>. */
/* These are used as bit flags for the arch field in the m68k_opcode
structure. */
#define _m68k_undef 0
#define m68000 0x001
#define m68008 m68000 /* Synonym for -m68000. otherwise unused. */
#define m68010 0x002
#define m68020 0x004
#define m68030 0x008
#define m68ec030 m68030 /* Similar enough to -m68030 to ignore differences;
gas will deal with the few differences. */
#define m68040 0x010
/* There is no 68050. */
#define m68060 0x020
#define m68881 0x040
#define m68882 m68881 /* Synonym for -m68881. otherwise unused. */
#define m68851 0x080
#define cpu32 0x100 /* e.g., 68332 */
#define mcfmac 0x200 /* ColdFire MAC. */
#define mcfemac 0x400 /* ColdFire EMAC. */
#define cfloat 0x800 /* ColdFire FPU. */
#define mcfhwdiv 0x1000 /* ColdFire hardware divide. */
#define mcfisa_a 0x2000 /* ColdFire ISA_A. */
#define mcfisa_aa 0x4000 /* ColdFire ISA_A+. */
#define mcfisa_b 0x8000 /* ColdFire ISA_B. */
#define mcfusp 0x10000 /* ColdFire USP instructions. */
#define mcf5200 0x20000
#define mcf5206e 0x40000
#define mcf521x 0x80000
#define mcf5249 0x100000
#define mcf528x 0x200000
#define mcf5307 0x400000
#define mcf5407 0x800000
#define mcf5470 0x1000000
#define mcf5480 0x2000000
/* Handy aliases. */
#define m68040up (m68040 | m68060)
#define m68030up (m68030 | m68040up)
#define m68020up (m68020 | m68030up)
#define m68010up (m68010 | cpu32 | m68020up)
#define m68000up (m68000 | m68010up)
#define mfloat (m68881 | m68882 | m68040 | m68060)
#define mmmu (m68851 | m68030 | m68040 | m68060)
/* The structure used to hold information for an opcode. */
struct m68k_opcode
{
/* The opcode name. */
const char *name;
/* The pseudo-size of the instruction(in bytes). Used to determine
number of bytes necessary to disassemble the instruction. */
unsigned int size;
/* The opcode itself. */
unsigned long opcode;
/* The mask used by the disassembler. */
unsigned long match;
/* The arguments. */
const char *args;
/* The architectures which support this opcode. */
unsigned int arch;
};
/* The structure used to hold information for an opcode alias. */
struct m68k_opcode_alias
{
/* The alias name. */
const char *alias;
/* The instruction for which this is an alias. */
const char *primary;
};
/* We store four bytes of opcode for all opcodes because that is the
most any of them need. The actual length of an instruction is
always at least 2 bytes, and is as much longer as necessary to hold
the operands it has.
The match field is a mask saying which bits must match particular
opcode in order for an instruction to be an instance of that
opcode.
The args field is a string containing two characters for each
operand of the instruction. The first specifies the kind of
operand; the second, the place it is stored. */
/* Kinds of operands:
Characters used: AaBbCcDdEeFfGgHIiJkLlMmnOopQqRrSsTtU VvWwXxYyZz01234|*~%;@!&$?/<>#^+-
D data register only. Stored as 3 bits.
A address register only. Stored as 3 bits.
a address register indirect only. Stored as 3 bits.
R either kind of register. Stored as 4 bits.
r either kind of register indirect only. Stored as 4 bits.
At the moment, used only for cas2 instruction.
F floating point coprocessor register only. Stored as 3 bits.
O an offset (or width): immediate data 0-31 or data register.
Stored as 6 bits in special format for BF... insns.
+ autoincrement only. Stored as 3 bits (number of the address register).
- autodecrement only. Stored as 3 bits (number of the address register).
Q quick immediate data. Stored as 3 bits.
This matches an immediate operand only when value is in range 1 .. 8.
M moveq immediate data. Stored as 8 bits.
This matches an immediate operand only when value is in range -128..127
T trap vector immediate data. Stored as 4 bits.
k K-factor for fmove.p instruction. Stored as a 7-bit constant or
a three bit register offset, depending on the field type.
# immediate data. Stored in special places (b, w or l)
which say how many bits to store.
^ immediate data for floating point instructions. Special places
are offset by 2 bytes from '#'...
B pc-relative address, converted to an offset
that is treated as immediate data.
d displacement and register. Stores the register as 3 bits
and stores the displacement in the entire second word.
C the CCR. No need to store it; this is just for filtering validity.
S the SR. No need to store, just as with CCR.
U the USP. No need to store, just as with CCR.
E the MAC ACC. No need to store, just as with CCR.
e the EMAC ACC[0123].
G the MAC/EMAC MACSR. No need to store, just as with CCR.
g the EMAC ACCEXT{01,23}.
H the MASK. No need to store, just as with CCR.
i the MAC/EMAC scale factor.
I Coprocessor ID. Not printed if 1. The Coprocessor ID is always
extracted from the 'd' field of word one, which means that an extended
coprocessor opcode can be skipped using the 'i' place, if needed.
s System Control register for the floating point coprocessor.
J Misc register for movec instruction, stored in 'j' format.
Possible values:
0x000 SFC Source Function Code reg [60, 40, 30, 20, 10]
0x001 DFC Data Function Code reg [60, 40, 30, 20, 10]
0x002 CACR Cache Control Register [60, 40, 30, 20, mcf]
0x003 TC MMU Translation Control [60, 40]
0x004 ITT0 Instruction Transparent
Translation reg 0 [60, 40]
0x005 ITT1 Instruction Transparent
Translation reg 1 [60, 40]
0x006 DTT0 Data Transparent
Translation reg 0 [60, 40]
0x007 DTT1 Data Transparent
Translation reg 1 [60, 40]
0x008 BUSCR Bus Control Register [60]
0x800 USP User Stack Pointer [60, 40, 30, 20, 10]
0x801 VBR Vector Base reg [60, 40, 30, 20, 10, mcf]
0x802 CAAR Cache Address Register [ 30, 20]
0x803 MSP Master Stack Pointer [ 40, 30, 20]
0x804 ISP Interrupt Stack Pointer [ 40, 30, 20]
0x805 MMUSR MMU Status reg [ 40]
0x806 URP User Root Pointer [60, 40]
0x807 SRP Supervisor Root Pointer [60, 40]
0x808 PCR Processor Configuration reg [60]
0xC00 ROMBAR ROM Base Address Register [520X]
0xC04 RAMBAR0 RAM Base Address Register 0 [520X]
0xC05 RAMBAR1 RAM Base Address Register 0 [520X]
0xC0F MBAR0 RAM Base Address Register 0 [520X]
0xC04 FLASHBAR FLASH Base Address Register [mcf528x]
0xC05 RAMBAR Static RAM Base Address Register [mcf528x]
L Register list of the type d0-d7/a0-a7 etc.
(New! Improved! Can also hold fp0-fp7, as well!)
The assembler tries to see if the registers match the insn by
looking at where the insn wants them stored.
l Register list like L, but with all the bits reversed.
Used for going the other way. . .
c cache identifier which may be "nc" for no cache, "ic"
for instruction cache, "dc" for data cache, or "bc"
for both caches. Used in cinv and cpush. Always
stored in position "d".
u Any register, with ``upper'' or ``lower'' specification. Used
in the mac instructions with size word.
The remainder are all stored as 6 bits using an address mode and a
register number; they differ in which addressing modes they match.
* all (modes 0-6,7.0-4)
~ alterable memory (modes 2-6,7.0,7.1)
(not 0,1,7.2-4)
% alterable (modes 0-6,7.0,7.1)
(not 7.2-4)
; data (modes 0,2-6,7.0-4)
(not 1)
@ data, but not immediate (modes 0,2-6,7.0-3)
(not 1,7.4)
! control (modes 2,5,6,7.0-3)
(not 0,1,3,4,7.4)
& alterable control (modes 2,5,6,7.0,7.1)
(not 0,1,3,4,7.2-4)
$ alterable data (modes 0,2-6,7.0,7.1)
(not 1,7.2-4)
? alterable control, or data register (modes 0,2,5,6,7.0,7.1)
(not 1,3,4,7.2-4)
/ control, or data register (modes 0,2,5,6,7.0-3)
(not 1,3,4,7.4)
> *save operands (modes 2,4,5,6,7.0,7.1)
(not 0,1,3,7.2-4)
< *restore operands (modes 2,3,5,6,7.0-3)
(not 0,1,4,7.4)
coldfire move operands:
m (modes 0-4)
n (modes 5,7.2)
o (modes 6,7.0,7.1,7.3,7.4)
p (modes 0-5)
coldfire bset/bclr/btst/mulsl/mulul operands:
q (modes 0,2-5)
v (modes 0,2-5,7.0,7.1)
b (modes 0,2-5,7.2)
w (modes 2-5,7.2)
y (modes 2,5)
z (modes 2,5,7.2)
x mov3q immediate operand.
4 (modes 2,3,4,5)
*/
/* For the 68851: */
/* I didn't use much imagination in choosing the
following codes, so many of them aren't very
mnemonic. -rab
0 32 bit pmmu register
Possible values:
000 TC Translation Control Register (68030, 68851)
1 16 bit pmmu register
111 AC Access Control (68851)
2 8 bit pmmu register
100 CAL Current Access Level (68851)
101 VAL Validate Access Level (68851)
110 SCC Stack Change Control (68851)
3 68030-only pmmu registers (32 bit)
010 TT0 Transparent Translation reg 0
(aka Access Control reg 0 -- AC0 -- on 68ec030)
011 TT1 Transparent Translation reg 1
(aka Access Control reg 1 -- AC1 -- on 68ec030)
W wide pmmu registers
Possible values:
001 DRP Dma Root Pointer (68851)
010 SRP Supervisor Root Pointer (68030, 68851)
011 CRP Cpu Root Pointer (68030, 68851)
f function code register (68030, 68851)
0 SFC
1 DFC
V VAL register only (68851)
X BADx, BACx (16 bit)
100 BAD Breakpoint Acknowledge Data (68851)
101 BAC Breakpoint Acknowledge Control (68851)
Y PSR (68851) (MMUSR on 68030) (ACUSR on 68ec030)
Z PCSR (68851)
| memory (modes 2-6, 7.*)
t address test level (68030 only)
Stored as 3 bits, range 0-7.
Also used for breakpoint instruction now.
*/
/* Places to put an operand, for non-general operands:
Characters used: BbCcDdFfGgHhIijkLlMmNnostWw123456789/
s source, low bits of first word.
d dest, shifted 9 in first word
1 second word, shifted 12
2 second word, shifted 6
3 second word, shifted 0
4 third word, shifted 12
5 third word, shifted 6
6 third word, shifted 0
7 second word, shifted 7
8 second word, shifted 10
9 second word, shifted 5
D store in both place 1 and place 3; for divul and divsl.
B first word, low byte, for branch displacements
W second word (entire), for branch displacements
L second and third words (entire), for branch displacements
(also overloaded for move16)
b second word, low byte
w second word (entire) [variable word/long branch offset for dbra]
W second word (entire) (must be signed 16 bit value)
l second and third word (entire)
g variable branch offset for bra and similar instructions.
The place to store depends on the magnitude of offset.
t store in both place 7 and place 8; for floating point operations
c branch offset for cpBcc operations.
The place to store is word two if bit six of word one is zero,
and words two and three if bit six of word one is one.
i Increment by two, to skip over coprocessor extended operands. Only
works with the 'I' format.
k Dynamic K-factor field. Bits 6-4 of word 2, used as a register number.
Also used for dynamic fmovem instruction.
C floating point coprocessor constant - 7 bits. Also used for static
K-factors...
j Movec register #, stored in 12 low bits of second word.
m For M[S]ACx; 4 bits split with MSB shifted 6 bits in first word
and remaining 3 bits of register shifted 9 bits in first word.
Indicate upper/lower in 1 bit shifted 7 bits in second word.
Use with `R' or `u' format.
n `m' withouth upper/lower indication. (For M[S]ACx; 4 bits split
with MSB shifted 6 bits in first word and remaining 3 bits of
register shifted 9 bits in first word. No upper/lower
indication is done.) Use with `R' or `u' format.
o For M[S]ACw; 4 bits shifted 12 in second word (like `1').
Indicate upper/lower in 1 bit shifted 7 bits in second word.
Use with `R' or `u' format.
M For M[S]ACw; 4 bits in low bits of first word. Indicate
upper/lower in 1 bit shifted 6 bits in second word. Use with
`R' or `u' format.
N For M[S]ACw; 4 bits in low bits of second word. Indicate
upper/lower in 1 bit shifted 6 bits in second word. Use with
`R' or `u' format.
h shift indicator (scale factor), 1 bit shifted 10 in second word
Places to put operand, for general operands:
d destination, shifted 6 bits in first word
b source, at low bit of first word, and immediate uses one byte
w source, at low bit of first word, and immediate uses two bytes
l source, at low bit of first word, and immediate uses four bytes
s source, at low bit of first word.
Used sometimes in contexts where immediate is not allowed anyway.
f single precision float, low bit of 1st word, immediate uses 4 bytes
F double precision float, low bit of 1st word, immediate uses 8 bytes
x extended precision float, low bit of 1st word, immediate uses 12 bytes
p packed float, low bit of 1st word, immediate uses 12 bytes
G EMAC accumulator, load (bit 4 2nd word, !bit8 first word)
H EMAC accumulator, non load (bit 4 2nd word, bit 8 first word)
F EMAC ACCx
f EMAC ACCy
I MAC/EMAC scale factor
/ Like 's', but set 2nd word, bit 5 if trailing_ampersand set
] first word, bit 10
*/
extern const struct m68k_opcode m68k_opcodes[];
extern const struct m68k_opcode_alias m68k_opcode_aliases[];
extern const int m68k_numopcodes, m68k_numaliases;
/* **** End of m68k-opcode.h */
/* **** m68k-dis.c from sourceware.org CVS 2005-08-14. */
/* Print Motorola 68k instructions.
Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
Free Software Foundation, Inc.
This file is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it 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 program; if not, see <http://www.gnu.org/licenses/>. */
/* Local function prototypes. */
static const char * const fpcr_names[] =
{
"", "%fpiar", "%fpsr", "%fpiar/%fpsr", "%fpcr",
"%fpiar/%fpcr", "%fpsr/%fpcr", "%fpiar/%fpsr/%fpcr"
};
static const char *const reg_names[] =
{
"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",
"%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%fp", "%sp",
"%ps", "%pc"
};
/* Name of register halves for MAC/EMAC.
Separate from reg_names since 'spu', 'fpl' look weird. */
static const char *const reg_half_names[] =
{
"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",
"%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%a7",
"%ps", "%pc"
};
/* Sign-extend an (unsigned char). */
#if __STDC__ == 1
#define COERCE_SIGNED_CHAR(ch) ((signed char) (ch))
#else
#define COERCE_SIGNED_CHAR(ch) ((int) (((ch) ^ 0x80) & 0xFF) - 128)
#endif
/* Get a 1 byte signed integer. */
#define NEXTBYTE(p) (p += 2, fetch_data(info, p), COERCE_SIGNED_CHAR(p[-1]))
/* Get a 2 byte signed integer. */
#define COERCE16(x) ((int) (((x) ^ 0x8000) - 0x8000))
#define NEXTWORD(p) \
(p += 2, fetch_data(info, p), \
COERCE16 ((p[-2] << 8) + p[-1]))
/* Get a 4 byte signed integer. */
#define COERCE32(x) ((bfd_signed_vma) ((x) ^ 0x80000000) - 0x80000000)
#define NEXTLONG(p) \
(p += 4, fetch_data(info, p), \
(COERCE32 ((((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1])))
/* Get a 4 byte unsigned integer. */
#define NEXTULONG(p) \
(p += 4, fetch_data(info, p), \
(unsigned int) ((((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1]))
/* Get a single precision float. */
#define NEXTSINGLE(val, p) \
(p += 4, fetch_data(info, p), \
floatformat_to_double (&floatformat_ieee_single_big, (char *) p - 4, &val))
/* Get a double precision float. */
#define NEXTDOUBLE(val, p) \
(p += 8, fetch_data(info, p), \
floatformat_to_double (&floatformat_ieee_double_big, (char *) p - 8, &val))
/* Get an extended precision float. */
#define NEXTEXTEND(val, p) \
(p += 12, fetch_data(info, p), \
floatformat_to_double (&floatformat_m68881_ext, (char *) p - 12, &val))
/* Need a function to convert from packed to double
precision. Actually, it's easier to print a
packed number than a double anyway, so maybe
there should be a special case to handle this... */
#define NEXTPACKED(p) \
(p += 12, fetch_data(info, p), 0.0)
/* Maximum length of an instruction. */
#define MAXLEN 22
#include <setjmp.h>
struct private
{
/* Points to first byte not fetched. */
bfd_byte *max_fetched;
bfd_byte the_buffer[MAXLEN];
bfd_vma insn_start;
sigjmp_buf bailout;
};
/* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
to ADDR (exclusive) are valid. Returns 1 for success, longjmps
on error. */
static int
fetch_data2(struct disassemble_info *info, bfd_byte *addr)
{
int status;
struct private *priv = (struct private *)info->private_data;
bfd_vma start = priv->insn_start + (priv->max_fetched - priv->the_buffer);
status = (*info->read_memory_func) (start,
priv->max_fetched,
addr - priv->max_fetched,
info);
if (status != 0)
{
(*info->memory_error_func) (status, start, info);
siglongjmp(priv->bailout, 1);
}
else
priv->max_fetched = addr;
return 1;
}
static int
fetch_data(struct disassemble_info *info, bfd_byte *addr)
{
if (addr <= ((struct private *) (info->private_data))->max_fetched) {
return 1;
} else {
return fetch_data2(info, addr);
}
}
/* This function is used to print to the bit-bucket. */
static int
dummy_printer (FILE *file ATTRIBUTE_UNUSED,
const char *format ATTRIBUTE_UNUSED,
...)
{
return 0;
}
static void
dummy_print_address (bfd_vma vma ATTRIBUTE_UNUSED,
struct disassemble_info *info ATTRIBUTE_UNUSED)
{
}
/* Fetch BITS bits from a position in the instruction specified by CODE.
CODE is a "place to put an argument", or 'x' for a destination
that is a general address (mode and register).
BUFFER contains the instruction. */
static int
fetch_arg (unsigned char *buffer,
int code,
int bits,
disassemble_info *info)
{
int val = 0;
switch (code)
{
case '/': /* MAC/EMAC mask bit. */
val = buffer[3] >> 5;
break;
case 'G': /* EMAC ACC load. */
val = ((buffer[3] >> 3) & 0x2) | ((~buffer[1] >> 7) & 0x1);
break;
case 'H': /* EMAC ACC !load. */
val = ((buffer[3] >> 3) & 0x2) | ((buffer[1] >> 7) & 0x1);
break;
case ']': /* EMAC ACCEXT bit. */
val = buffer[0] >> 2;
break;
case 'I': /* MAC/EMAC scale factor. */
val = buffer[2] >> 1;
break;
case 'F': /* EMAC ACCx. */
val = buffer[0] >> 1;
break;
case 'f':
val = buffer[1];
break;
case 's':
val = buffer[1];
break;
case 'd': /* Destination, for register or quick. */
val = (buffer[0] << 8) + buffer[1];
val >>= 9;
break;
case 'x': /* Destination, for general arg. */
val = (buffer[0] << 8) + buffer[1];
val >>= 6;
break;
case 'k':
fetch_data(info, buffer + 3);
val = (buffer[3] >> 4);
break;
case 'C':
fetch_data(info, buffer + 3);
val = buffer[3];
break;
case '1':
fetch_data(info, buffer + 3);
val = (buffer[2] << 8) + buffer[3];
val >>= 12;
break;
case '2':
fetch_data(info, buffer + 3);
val = (buffer[2] << 8) + buffer[3];
val >>= 6;
break;
case '3':
case 'j':
fetch_data(info, buffer + 3);
val = (buffer[2] << 8) + buffer[3];
break;
case '4':
fetch_data(info, buffer + 5);
val = (buffer[4] << 8) + buffer[5];
val >>= 12;
break;
case '5':
fetch_data(info, buffer + 5);
val = (buffer[4] << 8) + buffer[5];
val >>= 6;
break;
case '6':
fetch_data(info, buffer + 5);
val = (buffer[4] << 8) + buffer[5];
break;
case '7':
fetch_data(info, buffer + 3);
val = (buffer[2] << 8) + buffer[3];
val >>= 7;
break;
case '8':
fetch_data(info, buffer + 3);
val = (buffer[2] << 8) + buffer[3];
val >>= 10;
break;
case '9':
fetch_data(info, buffer + 3);
val = (buffer[2] << 8) + buffer[3];
val >>= 5;
break;
case 'e':
val = (buffer[1] >> 6);
break;
case 'm':
val = (buffer[1] & 0x40 ? 0x8 : 0)
| ((buffer[0] >> 1) & 0x7)
| (buffer[3] & 0x80 ? 0x10 : 0);
break;
case 'n':
val = (buffer[1] & 0x40 ? 0x8 : 0) | ((buffer[0] >> 1) & 0x7);
break;
case 'o':
val = (buffer[2] >> 4) | (buffer[3] & 0x80 ? 0x10 : 0);
break;
case 'M':
val = (buffer[1] & 0xf) | (buffer[3] & 0x40 ? 0x10 : 0);
break;
case 'N':
val = (buffer[3] & 0xf) | (buffer[3] & 0x40 ? 0x10 : 0);
break;
case 'h':
val = buffer[2] >> 2;
break;
default:
abort ();
}
switch (bits)
{
case 1:
return val & 1;
case 2:
return val & 3;
case 3:
return val & 7;
case 4:
return val & 017;
case 5:
return val & 037;
case 6:
return val & 077;
case 7:
return val & 0177;
case 8:
return val & 0377;
case 12:
return val & 07777;
default:
abort ();
}
}
/* Check if an EA is valid for a particular code. This is required
for the EMAC instructions since the type of source address determines
if it is a EMAC-load instruciton if the EA is mode 2-5, otherwise it
is a non-load EMAC instruction and the bits mean register Ry.
A similar case exists for the movem instructions where the register
mask is interpreted differently for different EAs. */
static bfd_boolean
m68k_valid_ea (char code, int val)
{
int mode, mask;
#define M(n0,n1,n2,n3,n4,n5,n6,n70,n71,n72,n73,n74) \
(n0 | n1 << 1 | n2 << 2 | n3 << 3 | n4 << 4 | n5 << 5 | n6 << 6 \
| n70 << 7 | n71 << 8 | n72 << 9 | n73 << 10 | n74 << 11)
switch (code)
{
case '*':
mask = M (1,1,1,1,1,1,1,1,1,1,1,1);
break;
case '~':
mask = M (0,0,1,1,1,1,1,1,1,0,0,0);
break;
case '%':
mask = M (1,1,1,1,1,1,1,1,1,0,0,0);
break;
case ';':
mask = M (1,0,1,1,1,1,1,1,1,1,1,1);
break;
case '@':
mask = M (1,0,1,1,1,1,1,1,1,1,1,0);
break;
case '!':
mask = M (0,0,1,0,0,1,1,1,1,1,1,0);
break;
case '&':
mask = M (0,0,1,0,0,1,1,1,1,0,0,0);
break;
case '$':
mask = M (1,0,1,1,1,1,1,1,1,0,0,0);
break;
case '?':
mask = M (1,0,1,0,0,1,1,1,1,0,0,0);
break;
case '/':
mask = M (1,0,1,0,0,1,1,1,1,1,1,0);
break;
case '|':
mask = M (0,0,1,0,0,1,1,1,1,1,1,0);
break;
case '>':
mask = M (0,0,1,0,1,1,1,1,1,0,0,0);
break;
case '<':
mask = M (0,0,1,1,0,1,1,1,1,1,1,0);
break;
case 'm':
mask = M (1,1,1,1,1,0,0,0,0,0,0,0);
break;
case 'n':
mask = M (0,0,0,0,0,1,0,0,0,1,0,0);
break;
case 'o':
mask = M (0,0,0,0,0,0,1,1,1,0,1,1);
break;
case 'p':
mask = M (1,1,1,1,1,1,0,0,0,0,0,0);
break;
case 'q':
mask = M (1,0,1,1,1,1,0,0,0,0,0,0);
break;
case 'v':
mask = M (1,0,1,1,1,1,0,1,1,0,0,0);
break;
case 'b':
mask = M (1,0,1,1,1,1,0,0,0,1,0,0);
break;
case 'w':
mask = M (0,0,1,1,1,1,0,0,0,1,0,0);
break;
case 'y':
mask = M (0,0,1,0,0,1,0,0,0,0,0,0);
break;
case 'z':
mask = M (0,0,1,0,0,1,0,0,0,1,0,0);
break;
case '4':
mask = M (0,0,1,1,1,1,0,0,0,0,0,0);
break;
default:
abort ();
}
#undef M
mode = (val >> 3) & 7;
if (mode == 7)
mode += val & 7;
return (mask & (1 << mode)) != 0;
}
/* Print a base register REGNO and displacement DISP, on INFO->STREAM.
REGNO = -1 for pc, -2 for none (suppressed). */
static void
print_base (int regno, bfd_vma disp, disassemble_info *info)
{
if (regno == -1)
{
(*info->fprintf_func) (info->stream, "%%pc@(");
(*info->print_address_func) (disp, info);
}
else
{
char buf[50];
if (regno == -2)
(*info->fprintf_func) (info->stream, "@(");
else if (regno == -3)
(*info->fprintf_func) (info->stream, "%%zpc@(");
else
(*info->fprintf_func) (info->stream, "%s@(", reg_names[regno]);
sprintf_vma (buf, disp);
(*info->fprintf_func) (info->stream, "%s", buf);
}
}
/* Print an indexed argument. The base register is BASEREG (-1 for pc).
P points to extension word, in buffer.
ADDR is the nominal core address of that extension word. */
static unsigned char *
print_indexed (int basereg,
unsigned char *p,
bfd_vma addr,
disassemble_info *info)
{
int word;
static const char *const scales[] = { "", ":2", ":4", ":8" };
bfd_vma base_disp;
bfd_vma outer_disp;
char buf[40];
char vmabuf[50];