-/* Print m68k instructions for GDB, the GNU debugger.
- Copyright (C) 1986, 1987 Free Software Foundation, Inc.
+/* Print Motorola 68k instructions for GDB, the GNU debugger.
+ Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc.
-GDB is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY. No author or distributor accepts responsibility to anyone
-for the consequences of using it or for whether it serves any
-particular purpose or works at all, unless he says so in writing.
-Refer to the GDB General Public License for full details.
+This file is part of GDB.
-Everyone is granted permission to copy, modify and redistribute GDB,
-but only under the conditions described in the GDB General Public
-License. A copy of this license is supposed to have been given to you
-along with GDB so you can know your rights and responsibilities. It
-should be in a file named COPYING. Among other things, the copyright
-notice and this notice must be preserved on all copies.
+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.
-In other words, go ahead and share GDB, but don't try to stop
-anyone else from sharing it farther. Help stamp out software hoarding!
-*/
+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.
-#include <stdio.h>
+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 "param.h"
-#include "symtab.h"
-#include "opcode.h"
+#include "dis-asm.h"
-/* 68k instructions are never longer than this many bytes. */
-#define MAXLEN 22
-
-/* Number of elements in the opcode table. */
-#define NOPCODES (sizeof m68k_opcodes / sizeof m68k_opcodes[0])
-
-extern char *reg_names[];
-char *fpcr_names[] = { "", "fpiar", "fpsr", "fpiar/fpsr", "fpcr",
- "fpiar/fpcr", "fpsr/fpcr", "fpiar-fpcr"};
-
-static unsigned char *print_insn_arg ();
-static unsigned char *print_indexed ();
-static void print_base ();
-static int fetch_arg ();
-
-#define NEXTBYTE(p) (p += 2, ((char *)p)[-1])
-
-#define NEXTWORD(p) \
- (p += 2, ((((char *)p)[-2]) << 8) + p[-1])
-
-#define NEXTLONG(p) \
- (p += 4, (((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1])
-
-#define NEXTSINGLE(p) \
- (p += 4, *((float *)(p - 4)))
-
-#define NEXTDOUBLE(p) \
- (p += 8, *((double *)(p - 8)))
-
-#define NEXTEXTEND(p) \
- (p += 12, 0.0) /* Need a function to convert from extended to double
- precision... */
-
-#define NEXTPACKED(p) \
- (p += 12, 0.0) /* 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... */
-\f
/* Print the m68k instruction at address MEMADDR in debugged memory,
on STREAM. Returns length of the instruction, in bytes. */
int
print_insn (memaddr, stream)
CORE_ADDR memaddr;
- FILE *stream;
-{
- unsigned char buffer[MAXLEN];
- register int i;
- register unsigned char *p;
- register char *d;
- register int bestmask;
- int best;
-
- read_memory (memaddr, buffer, MAXLEN);
-
- bestmask = 0;
- best = -1;
- for (i = 0; i < NOPCODES; 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 (stream, "0%o", (buffer[0] << 8) + buffer[1]);
- return 2;
- }
-
- fprintf (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;
- }
-
- d = m68k_opcodes[best].args;
-
- if (*d)
- fputc (' ', stream);
-
- while (*d)
- {
- p = print_insn_arg (d, buffer, p, memaddr + p - buffer, stream);
- d += 2;
- if (*d && *(d - 2) != 'I' && *d != 'k')
- fprintf (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 char *regname;
- register unsigned char *p1;
- register double flval;
- int flt_p;
-
- switch (*d)
- {
- case 'C':
- fprintf (stream, "ccr");
- break;
-
- case 'S':
- fprintf (stream, "sr");
- break;
-
- case 'U':
- fprintf (stream, "usp");
- break;
-
- case 'J':
- {
- static struct { char *name; int value; } names[]
- = {{"sfc", 0x000}, {"dfc", 0x001}, {"cacr", 0x002},
- {"usp", 0x800}, {"vbr", 0x801}, {"caar", 0x802},
- {"msp", 0x803}, {"isp", 0x804}};
-
- val = fetch_arg (buffer, place, 12);
- for (regno = sizeof names / sizeof names[0] - 1; regno >= 0; regno--)
- if (names[regno].value == val)
- {
- fprintf (stream, names[regno].name);
- break;
- }
- if (regno < 0)
- fprintf (stream, "%d", val);
- }
- break;
-
- case 'Q':
- val = fetch_arg (buffer, place, 3);
- if (val == 0) val = 8;
- fprintf (stream, "#%d", val);
- break;
-
- case 'M':
- val = fetch_arg (buffer, place, 8);
- if (val & 0x80)
- val = val - 0x100;
- fprintf (stream, "#%d", val);
- break;
-
- case 'T':
- val = fetch_arg (buffer, place, 4);
- fprintf (stream, "#%d", val);
- break;
-
- case 'D':
- fprintf (stream, "%s", reg_names[fetch_arg (buffer, place, 3)]);
- break;
-
- case 'A':
- fprintf (stream, "%s", reg_names[fetch_arg (buffer, place, 3) + 010]);
- break;
-
- case 'R':
- fprintf (stream, "%s", reg_names[fetch_arg (buffer, place, 4)]);
- break;
-
- case 'F':
- fprintf (stream, "fp%d", fetch_arg (buffer, place, 3));
- break;
-
- case 'O':
- val = fetch_arg (buffer, place, 6);
- if (val & 0x20)
- fprintf (stream, "%s", reg_names [val & 7]);
- else
- fprintf (stream, "%d", val);
- break;
-
- case '+':
- fprintf (stream, "(%s)+", reg_names[fetch_arg (buffer, place, 3) + 8]);
- break;
-
- case '-':
- fprintf (stream, "-(%s)", reg_names[fetch_arg (buffer, place, 3) + 8]);
- break;
-
- case 'k':
- if (place == 'k')
- fprintf (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 (stream, "{#%d}", val);
- }
- else
- error ("Invalid arg format in opcode table: \"%c%c\".",
- *d, place);
- break;
-
- case '#':
- p1 = buffer + 2;
- 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 (stream, "#%d", val);
- break;
-
- case '^':
- 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 == 'b')
- val = NEXTBYTE (p);
- else if (place == 'w')
- val = NEXTWORD (p);
- else if (place == 'l')
- val = NEXTLONG (p);
- else
- error ("Invalid arg format in opcode table: \"%c%c\".",
- *d, place);
- fprintf (stream, "#%d", val);
- break;
-
- case 'B':
- if (place == 'b')
- val = NEXTBYTE (p);
- else if (place == 'w')
- val = NEXTWORD (p);
- else if (place == 'l')
- val = NEXTLONG (p);
- else if (place == 'g')
- {
- val = ((char *)buffer)[1];
- 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 (stream, "%d(%s)", val, reg_names[fetch_arg (buffer, place, 3)]);
- break;
-
- case 's':
- fprintf (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 (stream, "(cpid=%d) ", val);
- if (place == 'i')
- p += 2; /* Skip coprocessor extended operands */
- break;
-
- 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 (stream, "%s", reg_names[val]);
- break;
-
- case 1:
- fprintf (stream, "%s", regname);
- break;
-
- case 2:
- fprintf (stream, "(%s)", regname);
- break;
-
- case 3:
- fprintf (stream, "(%s)+", regname);
- break;
-
- case 4:
- fprintf (stream, "-(%s)", regname);
- break;
-
- case 5:
- val = NEXTWORD (p);
- fprintf (stream, "%d(%s)", val, regname);
- break;
-
- case 6:
- p = print_indexed (regno, p, addr, stream);
- break;
-
- case 7:
- switch (val & 7)
- {
- case 0:
- val = NEXTWORD (p);
- fprintf (stream, "@#");
- print_address (val, stream);
- break;
-
- case 1:
- val = NEXTLONG (p);
- fprintf (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;
-
- case 'x':
- flval = NEXTEXTEND(p);
- break;
-
- case 'p':
- flval = NEXTPACKED(p);
- break;
-
- default:
- error ("Invalid arg format in opcode table: \"%c%c\".",
- *d, place);
- }
- if ( flt_p ) /* Print a float? */
- fprintf (stream, "#%g", flval);
- else
- fprintf (stream, "#%d", val);
- break;
-
- default:
- fprintf (stream, "<invalid address mode 0%o>", val);
- }
- }
- break;
-
- default:
- 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;
- char code;
- int bits;
+ GDB_FILE *stream;
{
- 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;
+ disassemble_info info;
- case '2':
- val = (buffer[2] << 8) + buffer[3];
- val >>= 6;
- break;
+ GDB_INIT_DISASSEMBLE_INFO(info, stream);
- 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;
-
- default:
- abort ();
- }
-
- switch (bits)
- {
- 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;
- FILE *stream;
- CORE_ADDR addr;
-{
- 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);
- fprintf (stream, "%s", buf);
- 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);
- fprintf (stream, "%s", buf);
- 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 (stream, "%d(", outer_disp);
- print_base (basereg, base_disp, stream);
-
- /* If postindexed, print the closeparen before the index. */
- if (word & 4)
- fprintf (stream, ")%s", buf);
- /* If preindexed, print the closeparen after the index. */
- else
- fprintf (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 (stream, "%d", disp);
- else if (regno == -1)
- fprintf (stream, "0x%x", disp);
- else
- fprintf (stream, "%d(%s)", disp, reg_names[regno]);
-}
-\f
-/* This is not part of insn printing, but it is machine-specific,
- so this is a convenient place to put it.
-
- Convert a 68881 extended float to a double.
- FROM is the address of the extended float.
- Store the double in *TO. */
-
-convert_from_68881 (from, to)
- char *from;
- double *to;
-{
-#ifdef USG_SGS_ASM
- asm ("mov.l 8(%a6),%a0");
- asm ("mov.l 12(%a6),%a1");
- asm ("fmove.x (%a0),%fp0");
- asm ("fmove.d %fp0,(%a1)");
-#else /* not USG_SGS_ASM */
-#if 0
- asm ("movl a6@(8),a0");
- asm ("movl a6@(12),a1");
- asm ("fmovex a0@,fp0");
- asm ("fmoved fp0,a1@");
-#else
- /* Hand-assemble those insns since some assemblers lose
- and some have different syntax. */
- asm (".word 020156");
- asm (".word 8");
- asm (".word 021156");
- asm (".word 12");
- asm (".long 0xf2104800");
- asm (".long 0xf2117400");
-#endif
-#endif /* not USG_SGS_ASM */
-}
-
-/* The converse: convert the double *FROM to an extended float
- and store where TO points. */
-
-convert_to_68881 (from, to)
- double *from;
- char *to;
-{
-#ifdef USG_SGS_ASM
- asm ("mov.l 8(%a6),%a0");
- asm ("mov.l 12(%a6),%a1");
- asm ("fmove.d (%a0),%fp0");
- asm ("fmove.x %fp0,(%a1)");
-#else /* not USG_SGS_ASM */
-#if 0
- asm ("movl a6@(8),a0");
- asm ("movl a6@(12),a1");
- asm ("fmoved a0@,fp0");
- asm ("fmovex fp0,a1@");
-#else
- /* Hand-assemble those insns since some assemblers lose. */
- asm (".word 020156");
- asm (".word 8");
- asm (".word 021156");
- asm (".word 12");
- asm (".long 0xf2105400");
- asm (".long 0xf2116800");
-#endif
-#endif /* not USG_SGS_ASM */
+ return print_insn_m68k (memaddr, &info);
}
projects / deliverable / binutils-gdb.git / blobdiff