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- /* Print Motorola 68k instructions.
- Copyright 1986, 1987, 1989, 1991, 1992, 1993 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, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-
- #include "dis-asm.h"
- #include "floatformat.h"
-
- #include "opcode/m68k.h"
-
- /* Local function prototypes */
-
- static int
- fetch_arg PARAMS ((unsigned char *, int, int, disassemble_info *));
-
- static void
- print_base PARAMS ((int, bfd_vma, disassemble_info*));
-
- static unsigned char *
- print_indexed PARAMS ((int, unsigned char *, bfd_vma, disassemble_info *));
-
- static int
- print_insn_arg PARAMS ((const char *, unsigned char *, unsigned char *,
- bfd_vma, disassemble_info *));
-
- CONST char * CONST fpcr_names[] = {
- "", "%fpiar", "%fpsr", "%fpiar/%fpsr", "%fpcr",
- "%fpiar/%fpcr", "%fpsr/%fpcr", "%fpiar/%fpsr/%fpcr"};
-
- static char *const reg_names[] = {
- "%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",
- "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%fp", "%sp",
- "%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) ((int) (((x) ^ 0x80000000) - 0x80000000))
- #define NEXTLONG(p) \
- (p += 4, FETCH_DATA (info, p), \
- (COERCE32 ((((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1])))
-
- /* NEXTSINGLE and NEXTDOUBLE handle alignment problems, but not
- * byte-swapping or other float format differences. FIXME! */
-
- union number {
- double d;
- float f;
- char c[10];
- };
-
- #define NEXTSINGLE(val, p) \
- { unsigned int i; union number u;\
- FETCH_DATA (info, p + sizeof (float));\
- for (i = 0; i < sizeof(float); i++) u.c[i] = *p++; \
- val = u.f; }
-
- #define NEXTDOUBLE(val, p) \
- { unsigned int i; union number u;\
- FETCH_DATA (info, p + sizeof (double));\
- for (i = 0; i < sizeof(double); i++) u.c[i] = *p++; \
- val = u.d; }
-
- /* Need a function to convert from extended to double precision... */
- #define NEXTEXTEND(p) \
- (p += 12, FETCH_DATA (info, p), 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... */
- #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;
- jmp_buf bailout;
- };
-
- /* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
- to ADDR (exclusive) are valid. Returns 1 for success, longjmps
- on error. */
- #define FETCH_DATA(info, addr) \
- ((addr) <= ((struct private *)(info->private_data))->max_fetched \
- ? 1 : fetch_data ((info), (addr)))
-
- static int
- fetch_data (info, addr)
- 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);
- longjmp (priv->bailout, 1);
- }
- else
- priv->max_fetched = addr;
- return 1;
- }
-
- /* This function is used to print to the bit-bucket. */
- static int
- #ifdef __STDC__
- dummy_printer (FILE * file, const char * format, ...)
- #else
- dummy_printer (file) FILE *file;
- #endif
- { return 0; }
-
- void
- dummy_print_address (vma, info)
- bfd_vma vma;
- struct disassemble_info *info;
- {
- }
-
- /* Print the m68k instruction at address MEMADDR in debugged memory,
- on INFO->STREAM. Returns length of the instruction, in bytes. */
-
- int
- print_insn_m68k (memaddr, info)
- bfd_vma memaddr;
- disassemble_info *info;
- {
- register int i;
- register unsigned char *p;
- unsigned char *save_p;
- register const char *d;
- register unsigned long bestmask;
- const struct m68k_opcode *best = 0;
- struct private priv;
- bfd_byte *buffer = priv.the_buffer;
- fprintf_ftype save_printer = info->fprintf_func;
- void (*save_print_address) PARAMS((bfd_vma, struct disassemble_info*))
- = info->print_address_func;
-
- info->private_data = (PTR) &priv;
- priv.max_fetched = priv.the_buffer;
- priv.insn_start = memaddr;
- if (setjmp (priv.bailout) != 0)
- /* Error return. */
- return -1;
-
- bestmask = 0;
- FETCH_DATA (info, buffer + 2);
- for (i = 0; i < m68k_numopcodes; i++)
- {
- const struct m68k_opcode *opc = &m68k_opcodes[i];
- unsigned long opcode = opc->opcode;
- unsigned long match = opc->match;
-
- if (((0xff & buffer[0] & (match >> 24)) == (0xff & (opcode >> 24)))
- && ((0xff & buffer[1] & (match >> 16)) == (0xff & (opcode >> 16)))
- /* Only fetch the next two bytes if we need to. */
- && (((0xffff & match) == 0)
- ||
- (FETCH_DATA (info, buffer + 4)
- && ((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 = opc->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 = opc->args; *d; d += 2)
- if (d[1] == 't')
- break;
-
- /* Don't match fmovel with more than one register; wait for
- fmoveml. */
- if (*d == '\0')
- {
- for (d = opc->args; *d; d += 2)
- {
- if (d[0] == 's' && d[1] == '8')
- {
- int val;
-
- val = fetch_arg (buffer, d[1], 3, info);
- if ((val & (val - 1)) != 0)
- break;
- }
- }
- }
-
- if (*d == '\0' && match > bestmask)
- {
- best = opc;
- bestmask = match;
- }
- }
- }
-
- if (best == 0)
- goto invalid;
-
- /* Point at first word of argument data,
- and at descriptor for first argument. */
- p = buffer + 2;
-
- /* Figure out how long the fixed-size portion of the instruction is.
- The only place this is stored in the opcode table is
- in the arguments--look for arguments which specify fields in the 2nd
- or 3rd words of the instruction. */
- for (d = best->args; *d; d += 2)
- {
- /* I don't think it is necessary to be checking d[0] here; I suspect
- all this could be moved to the case statement below. */
- 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[0] == 'L' || d[0] == 'l') && d[1] == 'w' && p - buffer < 4)
- p = buffer + 4;
- switch (d[1])
- {
- case '1':
- case '2':
- case '3':
- case '7':
- case '8':
- case '9':
- case 'i':
- if (p - buffer < 4)
- p = buffer + 4;
- break;
- case '4':
- case '5':
- case '6':
- if (p - buffer < 6)
- p = buffer + 6;
- break;
- default:
- break;
- }
- }
- /* Some opcodes like pflusha and lpstop are exceptions; they take no
- arguments but are two words long. Recognize them by looking at
- the lower 16 bits of the mask. */
- if (p - buffer < 4 && (best->match & 0xFFFF) != 0)
- p = buffer + 4;
-
- FETCH_DATA (info, p);
-
- d = best->args;
-
- /* We can the operands twice. The first time we don't print anything,
- but look for errors. */
-
- save_p = p;
- info->print_address_func = dummy_print_address;
- info->fprintf_func = (fprintf_ftype)dummy_printer;
- for ( ; *d; d += 2)
- {
- int eaten = print_insn_arg (d, buffer, p, memaddr + p - buffer, info);
- if (eaten >= 0)
- p += eaten;
- else if (eaten == -1)
- goto invalid;
- else
- {
- (*info->fprintf_func)(info->stream,
- "<internal error in opcode table: %s %s>\n",
- best->name,
- best->args);
- goto invalid;
- }
-
- }
- p = save_p;
- info->fprintf_func = save_printer;
- info->print_address_func = save_print_address;
-
- d = best->args;
-
- (*info->fprintf_func) (info->stream, "%s", best->name);
-
- if (*d)
- (*info->fprintf_func) (info->stream, " ");
-
- while (*d)
- {
- p += print_insn_arg (d, buffer, p, memaddr + p - buffer, info);
- d += 2;
- if (*d && *(d - 2) != 'I' && *d != 'k')
- (*info->fprintf_func) (info->stream, ",");
- }
- return p - buffer;
-
- invalid:
- /* Handle undefined instructions. */
- info->fprintf_func = save_printer;
- info->print_address_func = save_print_address;
- (*info->fprintf_func) (info->stream, "0%o",
- (buffer[0] << 8) + buffer[1]);
- return 2;
- }
-
- /* Returns number of bytes "eaten" by the operand, or
- return -1 if an invalid operand was found, or -2 if
- an opcode tabe error was found. */
-
- static int
- print_insn_arg (d, buffer, p0, addr, info)
- const char *d;
- unsigned char *buffer;
- unsigned char *p0;
- bfd_vma addr; /* PC for this arg to be relative to */
- disassemble_info *info;
- {
- register int val = 0;
- register int place = d[1];
- register unsigned char *p = p0;
- int regno;
- register CONST char *regname;
- register unsigned char *p1;
- double flval;
- int flt_p;
-
- switch (*d)
- {
- case 'c': /* cache identifier */
- {
- static char *const cacheFieldName[] = { "nc", "dc", "ic", "bc" };
- val = fetch_arg (buffer, place, 2, info);
- (*info->fprintf_func) (info->stream, cacheFieldName[val]);
- break;
- }
-
- case 'a': /* address register indirect only. Cf. case '+'. */
- {
- (*info->fprintf_func)
- (info->stream,
- "%s@",
- reg_names [fetch_arg (buffer, place, 3, info) + 8]);
- break;
- }
-
- case '_': /* 32-bit absolute address for move16. */
- {
- val = NEXTLONG (p);
- (*info->print_address_func) (val, info);
- break;
- }
-
- case 'C':
- (*info->fprintf_func) (info->stream, "%%ccr");
- break;
-
- case 'S':
- (*info->fprintf_func) (info->stream, "%%sr");
- break;
-
- case 'U':
- (*info->fprintf_func) (info->stream, "%%usp");
- break;
-
- case 'J':
- {
- static const struct { char *name; int value; } names[]
- = {{"%sfc", 0x000}, {"%dfc", 0x001}, {"%cacr", 0x002},
- {"%tc", 0x003}, {"%itt0",0x004}, {"%itt1", 0x005},
- {"%dtt0",0x006}, {"%dtt1",0x007}, {"%buscr",0x008},
- {"%usp", 0x800}, {"%vbr", 0x801}, {"%caar", 0x802},
- {"%msp", 0x803}, {"%ibsp", 0x804},
-
- /* Should we be calling this psr like we do in case 'Y'? */
- {"%mmusr",0x805},
-
- {"%urp", 0x806}, {"%srp", 0x807}, {"%pcr", 0x808}};
-
- val = fetch_arg (buffer, place, 12, info);
- for (regno = sizeof names / sizeof names[0] - 1; regno >= 0; regno--)
- if (names[regno].value == val)
- {
- (*info->fprintf_func) (info->stream, "%s", names[regno].name);
- break;
- }
- if (regno < 0)
- (*info->fprintf_func) (info->stream, "%d", val);
- }
- break;
-
- case 'Q':
- val = fetch_arg (buffer, place, 3, info);
- /* 0 means 8, except for the bkpt instruction... */
- if (val == 0 && d[1] != 's')
- val = 8;
- (*info->fprintf_func) (info->stream, "#%d", val);
- break;
-
- case 'M':
- val = fetch_arg (buffer, place, 8, info);
- if (val & 0x80)
- val = val - 0x100;
- (*info->fprintf_func) (info->stream, "#%d", val);
- break;
-
- case 'T':
- val = fetch_arg (buffer, place, 4, info);
- (*info->fprintf_func) (info->stream, "#%d", val);
- break;
-
- case 'D':
- (*info->fprintf_func) (info->stream, "%s",
- reg_names[fetch_arg (buffer, place, 3, info)]);
- break;
-
- case 'A':
- (*info->fprintf_func)
- (info->stream, "%s",
- reg_names[fetch_arg (buffer, place, 3, info) + 010]);
- break;
-
- case 'R':
- (*info->fprintf_func)
- (info->stream, "%s",
- reg_names[fetch_arg (buffer, place, 4, info)]);
- break;
-
- case 'r':
- regno = fetch_arg (buffer, place, 4, info);
- if (regno > 7)
- (*info->fprintf_func) (info->stream, "%s@", reg_names[regno]);
- else
- (*info->fprintf_func) (info->stream, "@(%s)", reg_names[regno]);
- break;
-
- case 'F':
- (*info->fprintf_func)
- (info->stream, "%%fp%d",
- fetch_arg (buffer, place, 3, info));
- break;
-
- case 'O':
- val = fetch_arg (buffer, place, 6, info);
- if (val & 0x20)
- (*info->fprintf_func) (info->stream, "%s", reg_names [val & 7]);
- else
- (*info->fprintf_func) (info->stream, "%d", val);
- break;
-
- case '+':
- (*info->fprintf_func)
- (info->stream, "%s@+",
- reg_names[fetch_arg (buffer, place, 3, info) + 8]);
- break;
-
- case '-':
- (*info->fprintf_func)
- (info->stream, "%s@-",
- reg_names[fetch_arg (buffer, place, 3, info) + 8]);
- break;
-
- case 'k':
- if (place == 'k')
- (*info->fprintf_func)
- (info->stream, "{%s}",
- reg_names[fetch_arg (buffer, place, 3, info)]);
- else if (place == 'C')
- {
- val = fetch_arg (buffer, place, 7, info);
- if ( val > 63 ) /* This is a signed constant. */
- val -= 128;
- (*info->fprintf_func) (info->stream, "{#%d}", val);
- }
- else
- return -2;
- break;
-
- case '#':
- case '^':
- p1 = buffer + (*d == '#' ? 2 : 4);
- if (place == 's')
- val = fetch_arg (buffer, place, 4, info);
- else if (place == 'C')
- val = fetch_arg (buffer, place, 7, info);
- else if (place == '8')
- val = fetch_arg (buffer, place, 3, info);
- else if (place == '3')
- val = fetch_arg (buffer, place, 8, info);
- else if (place == 'b')
- val = NEXTBYTE (p1);
- else if (place == 'w' || place == 'W')
- val = NEXTWORD (p1);
- else if (place == 'l')
- val = NEXTLONG (p1);
- else
- return -2;
- (*info->fprintf_func) (info->stream, "#%d", val);
- break;
-
- case 'B':
- if (place == 'b')
- val = NEXTBYTE (p);
- else if (place == 'B')
- val = COERCE_SIGNED_CHAR(buffer[1]);
- else if (place == 'w' || place == 'W')
- val = NEXTWORD (p);
- else if (place == 'l' || place == 'L' || place == 'C')
- 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
- return -2;
-
- (*info->print_address_func) (addr + val, info);
- break;
-
- case 'd':
- val = NEXTWORD (p);
- (*info->fprintf_func)
- (info->stream, "%s@(%d)",
- reg_names[fetch_arg (buffer, place, 3, info)], val);
- break;
-
- case 's':
- (*info->fprintf_func) (info->stream, "%s",
- fpcr_names[fetch_arg (buffer, place, 3, info)]);
- break;
-
- case 'I':
- /* Get coprocessor ID... */
- val = fetch_arg (buffer, 'd', 3, info);
-
- if (val != 1) /* Unusual coprocessor ID? */
- (*info->fprintf_func) (info->stream, "(cpid=%d) ", val);
- break;
-
- case '*':
- case '~':
- case '%':
- case ';':
- case '@':
- case '!':
- case '$':
- case '?':
- case '/':
- case '&':
- case '`':
- case '|':
-
- if (place == 'd')
- {
- val = fetch_arg (buffer, 'x', 6, info);
- val = ((val & 7) << 3) + ((val >> 3) & 7);
- }
- else
- val = fetch_arg (buffer, 's', 6, info);
-
- /* Get register number assuming address register. */
- regno = (val & 7) + 8;
- regname = reg_names[regno];
- switch (val >> 3)
- {
- case 0:
- (*info->fprintf_func) (info->stream, "%s", reg_names[val]);
- break;
-
- case 1:
- (*info->fprintf_func) (info->stream, "%s", regname);
- break;
-
- case 2:
- (*info->fprintf_func) (info->stream, "%s@", regname);
- break;
-
- case 3:
- (*info->fprintf_func) (info->stream, "%s@+", regname);
- break;
-
- case 4:
- (*info->fprintf_func) (info->stream, "%s@-", regname);
- break;
-
- case 5:
- val = NEXTWORD (p);
- (*info->fprintf_func) (info->stream, "%s@(%d)", regname, val);
- break;
-
- case 6:
- p = print_indexed (regno, p, addr, info);
- break;
-
- case 7:
- switch (val & 7)
- {
- case 0:
- val = NEXTWORD (p);
- (*info->print_address_func) (val, info);
- break;
-
- case 1:
- val = NEXTLONG (p);
- (*info->print_address_func) (val, info);
- break;
-
- case 2:
- val = NEXTWORD (p);
- (*info->print_address_func) (addr + val, info);
- break;
-
- case 3:
- p = print_indexed (-1, p, addr, info);
- 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':
- NEXTSINGLE(flval, p);
- break;
-
- case 'F':
- NEXTDOUBLE(flval, p);
- break;
-
- case 'x':
- FETCH_DATA (info, p + 12);
- floatformat_to_double (&floatformat_m68881_ext,
- (char *) p, &flval);
- p += 12;
- break;
-
- case 'p':
- flval = NEXTPACKED(p);
- break;
-
- default:
- return -1;
- }
- if ( flt_p ) /* Print a float? */
- (*info->fprintf_func) (info->stream, "#%g", flval);
- else
- (*info->fprintf_func) (info->stream, "#%d", val);
- break;
-
- default:
- return -1;
- }
- }
- 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)
- {
- (*info->fprintf_func) (info->stream, "#0");
- 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)
- (*info->fprintf_func) (info->stream, "/");
- doneany = 1;
- (*info->fprintf_func) (info->stream, "%s", reg_names[regno]);
- first_regno = regno;
- while (val & (1 << (regno + 1)))
- ++regno;
- if (regno > first_regno)
- (*info->fprintf_func) (info->stream, "-%s",
- reg_names[regno]);
- }
- }
- else if (place == '3')
- {
- /* `fmovem' insn. */
- char doneany;
- val = fetch_arg (buffer, place, 8, info);
- if (val == 0)
- {
- (*info->fprintf_func) (info->stream, "#0");
- 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)
- (*info->fprintf_func) (info->stream, "/");
- doneany = 1;
- (*info->fprintf_func) (info->stream, "%%fp%d", regno);
- first_regno = regno;
- while (val & (1 << (regno + 1)))
- ++regno;
- if (regno > first_regno)
- (*info->fprintf_func) (info->stream, "-%%fp%d", regno);
- }
- }
- else if (place == '8')
- {
- /* fmoveml for FP status registers */
- (*info->fprintf_func) (info->stream, "%s",
- fpcr_names[fetch_arg (buffer, place, 3,
- info)]);
- }
- else
- return -2;
- break;
-
- case 'X':
- place = '8';
- case 'Y':
- case 'Z':
- case 'W':
- case '0':
- case '1':
- case '2':
- case '3':
- {
- int val = fetch_arg (buffer, place, 5, info);
- char *name = 0;
- switch (val)
- {
- case 2: name = "%tt0"; break;
- case 3: name = "%tt1"; break;
- case 0x10: name = "%tc"; break;
- case 0x11: name = "%drp"; break;
- case 0x12: name = "%srp"; break;
- case 0x13: name = "%crp"; break;
- case 0x14: name = "%cal"; break;
- case 0x15: name = "%val"; break;
- case 0x16: name = "%scc"; break;
- case 0x17: name = "%ac"; break;
- case 0x18: name = "%psr"; break;
- case 0x19: name = "%pcsr"; break;
- case 0x1c:
- case 0x1d:
- {
- int break_reg = ((buffer[3] >> 2) & 7);
- (*info->fprintf_func)
- (info->stream, val == 0x1c ? "%%bad%d" : "%%bac%d",
- break_reg);
- }
- break;
- default:
- (*info->fprintf_func) (info->stream, "<mmu register %d>", val);
- }
- if (name)
- (*info->fprintf_func) (info->stream, "%s", name);
- }
- break;
-
- case 'f':
- {
- int fc = fetch_arg (buffer, place, 5, info);
- if (fc == 1)
- (*info->fprintf_func) (info->stream, "%%dfc");
- else if (fc == 0)
- (*info->fprintf_func) (info->stream, "%%sfc");
- else
- (*info->fprintf_func) (info->stream, "<function code %d>", fc);
- }
- break;
-
- case 'V':
- (*info->fprintf_func) (info->stream, "%%val");
- break;
-
- case 't':
- {
- int level = fetch_arg (buffer, place, 3, info);
- (*info->fprintf_func) (info->stream, "%d", level);
- }
- break;
-
- default:
- return -2;
- }
-
- return p - p0;
- }
-
- /* 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, info)
- unsigned char *buffer;
- int code;
- int bits;
- disassemble_info *info;
- {
- register int val = 0;
- 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':
- 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;
-
- 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, info)
- int basereg;
- unsigned char *p;
- bfd_vma addr;
- disassemble_info *info;
- {
- register int word;
- static char *const scales[] = {"", ":2", ":4", ":8"};
- bfd_vma base_disp;
- bfd_vma outer_disp;
- char buf[40];
- char vmabuf[50];
-
- 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)
- {
- word &= 0xff;
- if ((word & 0x80) != 0)
- word -= 0x100;
- if (basereg == -1)
- word += addr;
- print_base (basereg, word, info);
- (*info->fprintf_func) (info->stream, ",%s)", buf);
- return p;
- }
-
- /* Handle the generalized kind. */
- /* First, compute the displacement to add to the base register. */
-
- if (word & 0200)
- {
- if (basereg == -1)
- basereg = -3;
- else
- 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, info);
- if (buf[0] != '\0')
- (*info->fprintf_func) (info->stream, ",%s", buf);
- (*info->fprintf_func) (info->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);
- }
-
- print_base (basereg, base_disp, info);
- if ((word & 4) == 0 && buf[0] != '\0')
- {
- (*info->fprintf_func) (info->stream, ",%s", buf);
- buf[0] = '\0';
- }
- sprintf_vma (vmabuf, outer_disp);
- (*info->fprintf_func) (info->stream, ")@(%s", vmabuf);
- if (buf[0] != '\0')
- (*info->fprintf_func) (info->stream, ",%s", buf);
- (*info->fprintf_func) (info->stream, ")");
-
- return p;
- }
-
- /* Print a base register REGNO and displacement DISP, on INFO->STREAM.
- REGNO = -1 for pc, -2 for none (suppressed). */
-
- static void
- print_base (regno, disp, info)
- 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);
- }
- }
-