This is m68k-pinsn.c in view mode; [Download] [Up]
/* Print Motorola 68k instructions for GDB, the GNU debugger.
Copyright 1986, 1987, 1989, 1991, 1992, 1993 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "defs.h"
#include "symtab.h"
#include "gdbcore.h"
#include "ieee-float.h"
/* Opcode/m68k.h is a massive table. As a kludge, break it up into
two pieces. This makes nonportable C -- FIXME -- it assumes that
two data items declared near each other will be contiguous in
memory. This kludge can be removed, FIXME, when GCC is fixed to not
be a hog about initializers. */
#ifdef __GNUC__
#define BREAK_UP_BIG_DECL }; \
struct m68k_opcode m68k_opcodes_2[] = {
#define AND_OTHER_PART sizeof (m68k_opcodes_2)
#endif
#include "opcode/m68k.h"
/* Local function prototypes */
static int
fetch_arg PARAMS ((unsigned char *, int, int));
static void
print_base PARAMS ((int, int, FILE *));
static unsigned char *
print_indexed PARAMS ((int, unsigned char *, CORE_ADDR, FILE *));
static unsigned char *
print_insn_arg PARAMS ((char *, unsigned char *, unsigned char *, CORE_ADDR,
FILE *));
/* 68k instructions are never longer than this many bytes. */
#define MAXLEN 22
const char * const fpcr_names[] = {
"", "fpiar", "fpsr", "fpiar/fpsr", "fpcr",
"fpiar/fpcr", "fpsr/fpcr", "fpiar/fpsr/fpcr"};
/* Define accessors for 68K's 1, 2, and 4-byte signed quantities.
The _SHIFT values move the quantity to the high order end of an
`int' value, so it will sign-extend. Probably a few more casts
are needed to make it compile without warnings on finicky systems. */
#define BITS_PER_BYTE 8
#define BYTE_SHIFT (BITS_PER_BYTE * ((sizeof (int)) - 1))
#define WORD_SHIFT (BITS_PER_BYTE * ((sizeof (int)) - 2))
#define LONG_SHIFT (BITS_PER_BYTE * ((sizeof (int)) - 4))
#define NEXTBYTE(p) (p += 2, ((int)(p[-1]) << BYTE_SHIFT) >> BYTE_SHIFT)
#define NEXTWORD(p) \
(p += 2, (((int)((p[-2] << 8) + p[-1])) << WORD_SHIFT) >> WORD_SHIFT)
#define NEXTLONG(p) \
(p += 4, (((int)((((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1])) \
<< LONG_SHIFT) >> LONG_SHIFT)
/* Ecch -- assumes host == target float formats. FIXME. */
#define NEXTSINGLE(p) \
(p += 4, *((float *)(p - 4)))
#define NEXTDOUBLE(p) \
(p += 8, *((double *)(p - 8)))
/* Print the m68k instruction at address MEMADDR in debugged memory,
on STREAM. Returns length of the instruction, in bytes. */
int
print_insn_m68k (memaddr, info)
CORE_ADDR memaddr;
disassemble_info *info;
{
unsigned char buffer[MAXLEN];
register int i;
register unsigned char *p;
register char *d;
register int bestmask;
int best;
FILE *stream = info->stream;
read_memory (memaddr, (char *) buffer, MAXLEN);
bestmask = 0;
best = -1;
for (i = 0; i < numopcodes; i++)
{
register unsigned int opcode = m68k_opcodes[i].opcode;
register unsigned int match = m68k_opcodes[i].match;
if (((0xff & buffer[0] & (match >> 24)) == (0xff & (opcode >> 24)))
&& ((0xff & buffer[1] & (match >> 16)) == (0xff & (opcode >> 16)))
&& ((0xff & buffer[2] & (match >> 8)) == (0xff & (opcode >> 8)))
&& ((0xff & buffer[3] & match) == (0xff & opcode)))
{
/* Don't use for printout the variants of divul and divsl
that have the same register number in two places.
The more general variants will match instead. */
for (d = m68k_opcodes[i].args; *d; d += 2)
if (d[1] == 'D')
break;
/* Don't use for printout the variants of most floating
point coprocessor instructions which use the same
register number in two places, as above. */
if (*d == 0)
for (d = m68k_opcodes[i].args; *d; d += 2)
if (d[1] == 't')
break;
if (*d == 0 && match > bestmask)
{
best = i;
bestmask = match;
}
}
}
/* Handle undefined instructions. */
if (best < 0)
{
fprintf_filtered (stream, "0%o", (buffer[0] << 8) + buffer[1]);
return 2;
}
fprintf_filtered (stream, "%s", m68k_opcodes[best].name);
/* Point at first word of argument data,
and at descriptor for first argument. */
p = buffer + 2;
/* Why do this this way? -MelloN */
for (d = m68k_opcodes[best].args; *d; d += 2)
{
if (d[0] == '#')
{
if (d[1] == 'l' && p - buffer < 6)
p = buffer + 6;
else if (p - buffer < 4 && d[1] != 'C' && d[1] != '8' )
p = buffer + 4;
}
if (d[1] >= '1' && d[1] <= '3' && p - buffer < 4)
p = buffer + 4;
if (d[1] >= '4' && d[1] <= '6' && p - buffer < 6)
p = buffer + 6;
if ((d[0] == 'L' || d[0] == 'l') && d[1] == 'w' && p - buffer < 4)
p = buffer + 4;
}
d = m68k_opcodes[best].args;
if (*d)
fputs_filtered (" ", stream);
while (*d)
{
p = print_insn_arg (d, buffer, p, memaddr + p - buffer, stream);
d += 2;
if (*d && *(d - 2) != 'I' && *d != 'k')
fputs_filtered (",", stream);
}
return p - buffer;
}
static unsigned char *
print_insn_arg (d, buffer, p, addr, stream)
char *d;
unsigned char *buffer;
register unsigned char *p;
CORE_ADDR addr; /* PC for this arg to be relative to */
FILE *stream;
{
register int val;
register int place = d[1];
int regno;
register const char *regname;
register unsigned char *p1;
double flval;
int flt_p;
switch (*d)
{
case 'c': /* cache identifier */
{
static char *cacheFieldName[] = { "NOP", "dc", "ic", "bc" };
val = fetch_arg (buffer, place, 2);
fprintf_filtered (stream, cacheFieldName[val]);
break;
}
case 'a': /* address register indirect only. Cf. case '+'. */
{
fprintf_filtered (stream,
"%s@",
reg_names [fetch_arg (buffer, place, 3) + 8]);
break;
}
case '_': /* 32-bit absolute address for move16. */
{
val = NEXTLONG (p);
fprintf_filtered (stream, "@#");
print_address (val, stream);
break;
}
case 'C':
fprintf_filtered (stream, "ccr");
break;
case 'S':
fprintf_filtered (stream, "sr");
break;
case 'U':
fprintf_filtered (stream, "usp");
break;
case 'J':
{
static struct { char *name; int value; } names[]
= {{"sfc", 0x000}, {"dfc", 0x001}, {"cacr", 0x002},
{"tc", 0x003}, {"itt0",0x004}, {"itt1", 0x005},
{"dtt0",0x006}, {"dtt1",0x007},
{"usp", 0x800}, {"vbr", 0x801}, {"caar", 0x802},
{"msp", 0x803}, {"isp", 0x804}, {"mmusr",0x805},
{"urp", 0x806}, {"srp", 0x807}};
val = fetch_arg (buffer, place, 12);
for (regno = sizeof names / sizeof names[0] - 1; regno >= 0; regno--)
if (names[regno].value == val)
{
fprintf_filtered (stream, names[regno].name);
break;
}
if (regno < 0)
fprintf_filtered (stream, "%d", val);
}
break;
case 'Q':
val = fetch_arg (buffer, place, 3);
/* 0 means 8, except for the bkpt instruction... */
if (val == 0 && d[1] != 's')
val = 8;
fprintf_filtered (stream, "#%d", val);
break;
case 'M':
val = fetch_arg (buffer, place, 8);
if (val & 0x80)
val = val - 0x100;
fprintf_filtered (stream, "#%d", val);
break;
case 'T':
val = fetch_arg (buffer, place, 4);
fprintf_filtered (stream, "#%d", val);
break;
case 'D':
fprintf_filtered (stream, "%s", reg_names[fetch_arg (buffer, place, 3)]);
break;
case 'A':
fprintf_filtered (stream, "%s",
reg_names[fetch_arg (buffer, place, 3) + 010]);
break;
case 'R':
fprintf_filtered (stream, "%s", reg_names[fetch_arg (buffer, place, 4)]);
break;
case 'r':
fprintf_filtered (stream, "%s@", reg_names[fetch_arg (buffer, place, 4)]);
break;
case 'F':
fprintf_filtered (stream, "fp%d", fetch_arg (buffer, place, 3));
break;
case 'O':
val = fetch_arg (buffer, place, 6);
if (val & 0x20)
fprintf_filtered (stream, "%s", reg_names [val & 7]);
else
fprintf_filtered (stream, "%d", val);
break;
case '+':
fprintf_filtered (stream, "%s@+",
reg_names[fetch_arg (buffer, place, 3) + 8]);
break;
case '-':
fprintf_filtered (stream, "%s@-",
reg_names[fetch_arg (buffer, place, 3) + 8]);
break;
case 'k':
if (place == 'k')
fprintf_filtered (stream, "{%s}", reg_names[fetch_arg (buffer, place, 3)]);
else if (place == 'C')
{
val = fetch_arg (buffer, place, 7);
if ( val > 63 ) /* This is a signed constant. */
val -= 128;
fprintf_filtered (stream, "{#%d}", val);
}
else
error ("Invalid arg format in opcode table: \"%c%c\".",
*d, place);
break;
case '#':
case '^':
p1 = buffer + (*d == '#' ? 2 : 4);
if (place == 's')
val = fetch_arg (buffer, place, 4);
else if (place == 'C')
val = fetch_arg (buffer, place, 7);
else if (place == '8')
val = fetch_arg (buffer, place, 3);
else if (place == '3')
val = fetch_arg (buffer, place, 8);
else if (place == 'b')
val = NEXTBYTE (p1);
else if (place == 'w')
val = NEXTWORD (p1);
else if (place == 'l')
val = NEXTLONG (p1);
else
error ("Invalid arg format in opcode table: \"%c%c\".",
*d, place);
fprintf_filtered (stream, "#%d", val);
break;
case 'B':
if (place == 'b')
val = NEXTBYTE (p);
else if (place == 'B')
val = NEXTBYTE (buffer); /* from the opcode word */
else if (place == 'w' || place == 'W')
val = NEXTWORD (p);
else if (place == 'l' || place == 'L')
val = NEXTLONG (p);
else if (place == 'g')
{
val = NEXTBYTE (buffer);
if (val == 0)
val = NEXTWORD (p);
else if (val == -1)
val = NEXTLONG (p);
}
else if (place == 'c')
{
if (buffer[1] & 0x40) /* If bit six is one, long offset */
val = NEXTLONG (p);
else
val = NEXTWORD (p);
}
else
error ("Invalid arg format in opcode table: \"%c%c\".",
*d, place);
print_address (addr + val, stream);
break;
case 'd':
val = NEXTWORD (p);
fprintf_filtered (stream, "%s@(%d)",
reg_names[fetch_arg (buffer, place, 3)], val);
break;
case 's':
fprintf_filtered (stream, "%s",
fpcr_names[fetch_arg (buffer, place, 3)]);
break;
case 'I':
val = fetch_arg (buffer, 'd', 3); /* Get coprocessor ID... */
if (val != 1) /* Unusual coprocessor ID? */
fprintf_filtered (stream, "(cpid=%d) ", val);
if (place == 'i')
p += 2; /* Skip coprocessor extended operands */
break;
case '*':
case '~':
case '%':
case ';':
case '@':
case '!':
case '$':
case '?':
case '/':
case '&':
case '`':
if (place == 'd')
{
val = fetch_arg (buffer, 'x', 6);
val = ((val & 7) << 3) + ((val >> 3) & 7);
}
else
val = fetch_arg (buffer, 's', 6);
/* Get register number assuming address register. */
regno = (val & 7) + 8;
regname = reg_names[regno];
switch (val >> 3)
{
case 0:
fprintf_filtered (stream, "%s", reg_names[val]);
break;
case 1:
fprintf_filtered (stream, "%s", regname);
break;
case 2:
fprintf_filtered (stream, "%s@", regname);
break;
case 3:
fprintf_filtered (stream, "%s@+", regname);
break;
case 4:
fprintf_filtered (stream, "%s@-", regname);
break;
case 5:
val = NEXTWORD (p);
fprintf_filtered (stream, "%s@(%d)", regname, val);
break;
case 6:
p = print_indexed (regno, p, addr, stream);
break;
case 7:
switch (val & 7)
{
case 0:
val = NEXTWORD (p);
fprintf_filtered (stream, "@#");
print_address (val, stream);
break;
case 1:
val = NEXTLONG (p);
fprintf_filtered (stream, "@#");
print_address (val, stream);
break;
case 2:
val = NEXTWORD (p);
print_address (addr + val, stream);
break;
case 3:
p = print_indexed (-1, p, addr, stream);
break;
case 4:
flt_p = 1; /* Assume it's a float... */
switch( place )
{
case 'b':
val = NEXTBYTE (p);
flt_p = 0;
break;
case 'w':
val = NEXTWORD (p);
flt_p = 0;
break;
case 'l':
val = NEXTLONG (p);
flt_p = 0;
break;
case 'f':
flval = NEXTSINGLE(p);
break;
case 'F':
flval = NEXTDOUBLE(p);
break;
#ifdef HAVE_68881
case 'x':
ieee_extended_to_double (&ext_format_68881,
(char *)p, &flval);
p += 12;
break;
#endif
case 'p':
p += 12;
flval = 0; /* FIXME, handle packed decimal someday. */
break;
default:
error ("Invalid arg format in opcode table: \"%c%c\".",
*d, place);
}
if ( flt_p ) /* Print a float? */
fprintf_filtered (stream, "#%g", flval);
else
fprintf_filtered (stream, "#%d", val);
break;
default:
fprintf_filtered (stream, "<invalid address mode 0%o>", val);
}
}
break;
case 'L':
case 'l':
if (place == 'w')
{
char doneany;
p1 = buffer + 2;
val = NEXTWORD (p1);
/* Move the pointer ahead if this point is farther ahead
than the last. */
p = p1 > p ? p1 : p;
if (val == 0)
{
fputs_filtered ("#0", stream);
break;
}
if (*d == 'l')
{
register int newval = 0;
for (regno = 0; regno < 16; ++regno)
if (val & (0x8000 >> regno))
newval |= 1 << regno;
val = newval;
}
val &= 0xffff;
doneany = 0;
for (regno = 0; regno < 16; ++regno)
if (val & (1 << regno))
{
int first_regno;
if (doneany)
fputs_filtered ("/", stream);
doneany = 1;
fprintf_filtered (stream, "%s", reg_names[regno]);
first_regno = regno;
while (val & (1 << (regno + 1)))
++regno;
if (regno > first_regno)
fprintf_filtered (stream, "-%s", reg_names[regno]);
}
}
else if (place == '3')
{
/* `fmovem' insn. */
char doneany;
val = fetch_arg (buffer, place, 8);
if (val == 0)
{
fputs_filtered ("#0", stream);
break;
}
if (*d == 'l')
{
register int newval = 0;
for (regno = 0; regno < 8; ++regno)
if (val & (0x80 >> regno))
newval |= 1 << regno;
val = newval;
}
val &= 0xff;
doneany = 0;
for (regno = 0; regno < 8; ++regno)
if (val & (1 << regno))
{
int first_regno;
if (doneany)
fputs_filtered ("/", stream);
doneany = 1;
fprintf_filtered (stream, "fp%d", regno);
first_regno = regno;
while (val & (1 << (regno + 1)))
++regno;
if (regno > first_regno)
fprintf_filtered (stream, "-fp%d", regno);
}
}
else
goto de_fault;
break;
default: de_fault:
error ("Invalid arg format in opcode table: \"%c\".", *d);
}
return (unsigned char *) p;
}
/* 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 (buffer, code, bits)
unsigned char *buffer;
int code;
int bits;
{
register int val;
switch (code)
{
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':
val = (buffer[3] >> 4);
break;
case 'C':
val = buffer[3];
break;
case '1':
val = (buffer[2] << 8) + buffer[3];
val >>= 12;
break;
case '2':
val = (buffer[2] << 8) + buffer[3];
val >>= 6;
break;
case '3':
case 'j':
val = (buffer[2] << 8) + buffer[3];
break;
case '4':
val = (buffer[4] << 8) + buffer[5];
val >>= 12;
break;
case '5':
val = (buffer[4] << 8) + buffer[5];
val >>= 6;
break;
case '6':
val = (buffer[4] << 8) + buffer[5];
break;
case '7':
val = (buffer[2] << 8) + buffer[3];
val >>= 7;
break;
case '8':
val = (buffer[2] << 8) + buffer[3];
val >>= 10;
break;
case 'e':
val = (buffer[1] >> 6);
break;
default:
abort ();
}
switch (bits)
{
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 ();
}
}
/* 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 (basereg, p, addr, stream)
int basereg;
unsigned char *p;
CORE_ADDR addr;
FILE *stream;
{
register int word;
static char *scales[] = {"", "*2", "*4", "*8"};
register int base_disp;
register int outer_disp;
char buf[40];
word = NEXTWORD (p);
/* Generate the text for the index register.
Where this will be output is not yet determined. */
sprintf (buf, "[%s.%c%s]",
reg_names[(word >> 12) & 0xf],
(word & 0x800) ? 'l' : 'w',
scales[(word >> 9) & 3]);
/* Handle the 68000 style of indexing. */
if ((word & 0x100) == 0)
{
print_base (basereg,
((word & 0x80) ? word | 0xff00 : word & 0xff)
+ ((basereg == -1) ? addr : 0),
stream);
fputs_filtered (buf, stream);
return p;
}
/* Handle the generalized kind. */
/* First, compute the displacement to add to the base register. */
if (word & 0200)
basereg = -2;
if (word & 0100)
buf[0] = 0;
base_disp = 0;
switch ((word >> 4) & 3)
{
case 2:
base_disp = NEXTWORD (p);
break;
case 3:
base_disp = NEXTLONG (p);
}
if (basereg == -1)
base_disp += addr;
/* Handle single-level case (not indirect) */
if ((word & 7) == 0)
{
print_base (basereg, base_disp, stream);
fputs_filtered (buf, stream);
return p;
}
/* Two level. Compute displacement to add after indirection. */
outer_disp = 0;
switch (word & 3)
{
case 2:
outer_disp = NEXTWORD (p);
break;
case 3:
outer_disp = NEXTLONG (p);
}
fprintf_filtered (stream, "%d(", outer_disp);
print_base (basereg, base_disp, stream);
/* If postindexed, print the closeparen before the index. */
if (word & 4)
fprintf_filtered (stream, ")%s", buf);
/* If preindexed, print the closeparen after the index. */
else
fprintf_filtered (stream, "%s)", buf);
return p;
}
/* Print a base register REGNO and displacement DISP, on STREAM.
REGNO = -1 for pc, -2 for none (suppressed). */
static void
print_base (regno, disp, stream)
int regno;
int disp;
FILE *stream;
{
if (regno == -2)
fprintf_filtered (stream, "%d", disp);
else if (regno == -1)
fprintf_filtered (stream, "0x%x", disp);
else
fprintf_filtered (stream, "%d(%s)", disp, reg_names[regno]);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.