/* Print m68k instructions for objdump Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc. This file is part of the binutils. The binutils are 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, or (at your option) any later version. The 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 the binutils; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "bfd.h" #include "sysdep.h" #include #include "opcode/m68k.h" #ifndef GDB #define fprintf_filtered fprintf #define fputs_filtered fputs #endif /* 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 extern void print_address(); /* 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/fpsr/fpcr"}; char *reg_names[] = {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", "ps", "pc"}; static unsigned char *print_insn_arg (); static unsigned char *print_indexed (); static void print_base (); static int fetch_arg (); #define NEXTBYTE(p) (p += 2, COERCE_SIGNED_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]) /* 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) \ { int i; union number u;\ for (i = 0; i < sizeof(float); i++) u.c[i] = *p++; \ val = u.f; } #define NEXTDOUBLE(val, p) \ { int i; union number u;\ for (i = 0; i < sizeof(double); i++) u.c[i] = *p++; \ val = u.d; } #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... */ /* Print the m68k instruction at address MEMADDR in debugged memory, on STREAM. Returns length of the instruction, in bytes. */ int print_insn_m68k(addr, buffer, stream) bfd_vma addr; unsigned char *buffer; FILE *stream; { register unsigned int i; register unsigned char *p; register char *d; register unsigned int bestmask; int best; 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_filtered (stream, "0%o", (unsigned) (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, addr + 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; bfd_vma addr; /* PC for this arg to be relative to */ FILE *stream; { register int val = 0; register int place = d[1]; int regno; register char *regname; register unsigned char *p1; register double flval = 0; 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 fprintf_filtered(stderr, "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 fprintf_filtered(stderr, "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 = COERCE_SIGNED_CHAR(buffer[1]); else if (place == 'w' || place == 'W') val = NEXTWORD (p); else if (place == 'l' || 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 fprintf_filtered(stderr, "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': NEXTSINGLE(flval, p); break; case 'F': NEXTDOUBLE(flval, p); break; case 'x': flval = NEXTEXTEND(p); break; case 'p': flval = NEXTPACKED(p); break; default: fprintf_filtered(stderr, "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, "", (unsigned) 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: fprintf_filtered(stderr, "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; { 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': 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 (); return(0); } } /* fetch_arg() */ /* 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; bfd_vma 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); 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", (unsigned) disp); else fprintf_filtered (stream, "%d(%s)", disp, reg_names[regno]); }