/* Print vax instructions for GDB, the GNU debugger. Copyright (C) 1986, 1989 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 <stdio.h> #include "defs.h" #include "param.h" #include "symtab.h" #include "vax-opcode.h" /* Vax instructions are never longer than this. */ #define MAXLEN 62 /* Number of elements in the opcode table. */ #define NOPCODES (sizeof votstrs / sizeof votstrs[0]) extern char *reg_names[]; static unsigned char *print_insn_arg (); /* Print the vax 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; read_memory (memaddr, buffer, MAXLEN); for (i = 0; i < NOPCODES; i++) if (votstrs[i].detail.code == buffer[0] || votstrs[i].detail.code == *(unsigned short *)buffer) break; /* Handle undefined instructions. */ if (i == NOPCODES) { fprintf (stream, "0%o", buffer[0]); return 1; } fprintf (stream, "%s", votstrs[i].name); /* Point at first byte of argument data, and at descriptor for first argument. */ p = buffer + 1 + (votstrs[i].detail.code >= 0x100); d = votstrs[i].detail.args; if (*d) fputc (' ', stream); while (*d) { p = print_insn_arg (d, p, memaddr + (p - buffer), stream); d += 2; if (*d) fprintf (stream, ","); } return p - buffer; } static unsigned char * print_insn_arg (d, p, addr, stream) char *d; register char *p; CORE_ADDR addr; FILE *stream; { register int regnum = *p & 0xf; float floatlitbuf; if (*d == 'b') { if (d[1] == 'b') fprintf (stream, "0x%x", addr + *p++ + 1); else { fprintf (stream, "0x%x", addr + *(short *)p + 2); p += 2; } } else switch ((*p++ >> 4) & 0xf) { case 0: case 1: case 2: case 3: /* Literal mode */ if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h') { *(int *)&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4); fprintf (stream, "$%f", floatlitbuf); } else fprintf (stream, "$%d", p[-1] & 0x3f); break; case 4: /* Indexed */ p = (char *) print_insn_arg (d, p, addr + 1, stream); fprintf (stream, "[%s]", reg_names[regnum]); break; case 5: /* Register */ fprintf (stream, reg_names[regnum]); break; case 7: /* Autodecrement */ fputc ('-', stream); case 6: /* Register deferred */ fprintf (stream, "(%s)", reg_names[regnum]); break; case 9: /* Autoincrement deferred */ fputc ('@', stream); if (regnum == PC_REGNUM) { fputc ('#', stream); print_address (*(long *)p, stream); p += 4; break; } case 8: /* Autoincrement */ if (regnum == PC_REGNUM) { fputc ('#', stream); switch (d[1]) { case 'b': fprintf (stream, "%d", *p++); break; case 'w': fprintf (stream, "%d", *(short *)p); p += 2; break; case 'l': fprintf (stream, "%d", *(long *)p); p += 4; break; case 'q': fprintf (stream, "0x%x%08x", ((long *)p)[1], ((long *)p)[0]); p += 8; break; case 'o': fprintf (stream, "0x%x%08x%08x%08x", ((long *)p)[3], ((long *)p)[2], ((long *)p)[1], ((long *)p)[0]); p += 16; break; case 'f': if (INVALID_FLOAT (p, 4)) fprintf (stream, "<<invalid float 0x%x>>", *(int *) p); else fprintf (stream, "%f", *(float *) p); p += 4; break; case 'd': if (INVALID_FLOAT (p, 8)) fprintf (stream, "<<invalid float 0x%x%08x>>", ((long *)p)[1], ((long *)p)[0]); else fprintf (stream, "%f", *(double *) p); p += 8; break; case 'g': fprintf (stream, "g-float"); p += 8; break; case 'h': fprintf (stream, "h-float"); p += 16; break; } } else fprintf (stream, "(%s)+", reg_names[regnum]); break; case 11: /* Byte displacement deferred */ fputc ('@', stream); case 10: /* Byte displacement */ if (regnum == PC_REGNUM) print_address (addr + *p + 2, stream); else fprintf (stream, "%d(%s)", *p, reg_names[regnum]); p += 1; break; case 13: /* Word displacement deferred */ fputc ('@', stream); case 12: /* Word displacement */ if (regnum == PC_REGNUM) print_address (addr + *(short *)p + 3, stream); else fprintf (stream, "%d(%s)", *(short *)p, reg_names[regnum]); p += 2; break; case 15: /* Long displacement deferred */ fputc ('@', stream); case 14: /* Long displacement */ if (regnum == PC_REGNUM) print_address (addr + *(long *)p + 5, stream); else fprintf (stream, "%d(%s)", *(long *)p, reg_names[regnum]); p += 4; } return (unsigned char *) p; }