/* Print IBM RS/6000 instructions for GNU software. Copyright 1991 Free Software Foundation, Inc. Contributed by IBM Corporation. This file is part of GDB and the GNU binutils. 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 "opcode/rs6k.h" /* Print the rs6k 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; { int pop, eop, probable_eop; /* primary and extended opcodes */ int min, max; int best = -1; /* found best opcode index */ int oldbest = -1; unsigned int the_insn; read_memory (memaddr, &the_insn, sizeof (the_insn)); pop = (unsigned)(the_insn >> 26); min = 0, max = NOPCODES-1; while (min < max) { best = (min + max) / 2; /* see if we are running in loops */ if (best == oldbest) goto not_found; oldbest = best; if (pop < rs6k_ops [best].p_opcode) max = best; else if (pop > rs6k_ops [best].p_opcode) min = best; else { /* Opcode matched, check extended opcode. */ if (rs6k_ops [best].e_opcode == -1) { /* there is no valid extended opcode, what we've got is just fine. */ goto insn_found; } /* Largest possible value of extended opcode. */ probable_eop = ((the_insn) >> 1) & 0x3ff; eop = probable_eop & eopMask [rs6k_ops [best].format]; if (eop < rs6k_ops [best].e_opcode) { while (pop == rs6k_ops [best].p_opcode) { if (eop == rs6k_ops [best].e_opcode) /* found it! */ goto insn_found; --best; eop = probable_eop & eopMask [rs6k_ops [best].format]; } goto not_found; } else if (eop > rs6k_ops [best].e_opcode) { while (pop == rs6k_ops [best].p_opcode) { if (eop == rs6k_ops [best].e_opcode) /* found it! */ goto insn_found; ++best; eop = probable_eop & eopMask [rs6k_ops [best].format]; } goto not_found; } else /* eop == rs6k_ops [best].e_opcode */ goto insn_found; } } best = min; if (pop == rs6k_ops [best].p_opcode && (rs6k_ops [best].e_opcode == -1 || rs6k_ops [best].e_opcode == eop)) goto insn_found; else goto not_found; insn_found: print_operator (stream, memaddr, the_insn, best); return 4; not_found: fprintf (stream, "0x%08x", the_insn); return 4; } /* condition code names */ static char *cond_code [] = { "lt", "gt", "eq", "so", "ge", "le", "ne", "ns", "nl", "ng", "z", "nz" }; print_operator (stream, memaddr, insn_word, insn_no) FILE *stream; long memaddr; long insn_word; int insn_no; { char buf [20]; char *qq = buf; char *pp = rs6k_ops[insn_no].opr_ext; int tmp; int nocomma = 0; /* true if no comma needed */ if (pp) { while (*pp) { switch ( *pp ) { case '.': if (insn_word & 0x1) *qq++ = '.'; break; case 'l': if (insn_word & 0x1) *qq++ = 'l'; break; case 't': if ((insn_word & 0x03e00000) == 0x01800000) *qq++ = 't'; break; case 'f': if ((insn_word & 0x03e00000) == 0x00800000) *qq++ = 'f'; break; case 'a': if (insn_word & 0x2) *qq++ = 'a'; break; case 'o': if (insn_word & 0x4000) *qq++ = 'o'; break; case '1': /* exception #1 for bb/bc ambiguity */ tmp = (insn_word >> 21) & 0x1f; /* extract BO */ if (tmp != 0xc && tmp != 0x4) { /* you can't use `bb' now. switch to `bc' */ *(qq-1) = 'c'; ++insn_no; pp = rs6k_ops[insn_no].opr_ext; continue; } break; default: abort (); } ++pp; } } *qq = '\0'; fprintf (stream, "%s%s\t", rs6k_ops[insn_no].operator, buf); /* parse the operand now. */ pp = rs6k_ops[insn_no].oprnd_format; while (*pp != 0) { switch (*pp) { case TO : fprintf (stream, "%d", (insn_word >> 21) & 0x1f); break; case RT : case RS : fprintf (stream, "r%d", (insn_word >> 21) & 0x1f); break; case LI : tmp = (insn_word >> 16) & 0x1f; #if 0 /* This is wrong, wrong, wrong. The condition code only goes from 0 to 3 (for the instructions which can use extended mnemonics of this type), and the XX (lt, gt, eq etc.) goes into the mnemonic, not as an operand. Probably the best way to get this right in both assembler and disassembler is to switch to a match/lose style opcode table like the sparc. */ if (tmp > 11) { fprintf (stream, "{unknown cond code: 0x%x}", insn_word); tmp = 0; } fprintf (stream, "%s", cond_code [tmp]); #else /* So for just always use the "bbf/bbt" form. This is perfectly correct, just not necessarily as legible. If tmp is not in the range 0-3, we can't use an XX form anyway. */ fprintf (stream, "%d", tmp); #endif break; case A2 : case TA14 : tmp = (insn_word & 0xfffc); if (tmp & 0x8000) /* fix sign extension */ tmp -= 0x10000; if ((insn_word & 0x2) == 0) /* if AA not set */ tmp += memaddr; print_address (tmp, stream); break; case TA24 : tmp = insn_word & 0x03fffffc; if (tmp & 0x2000000) tmp -= 0x4000000; if ((insn_word & 0x2) == 0) /* if no AA bit set */ tmp += memaddr; print_address (tmp, stream); break; case LEV : /* for svc only */ if (insn_word & 0x2) { /* SA is set */ nocomma = 1; } else fprintf (stream, "%d", (insn_word >> 5) & 0x7f); break; case FL1 : /* for svc only */ if (insn_word & 0x2) { /* SA is set */ nocomma = 1; } else fprintf (stream, "%d", (insn_word >> 12) & 0xf); break; case FL2 : /* for svc only */ nocomma = 0; if (insn_word & 0x2) /* SA is set */ fprintf (stream, "%d", (insn_word >> 2) & 0x3fff); else fprintf (stream, "%d", (insn_word >> 2) & 0x7); break; case RA : if (nocomma) { fprintf (stream, "r%d)", (insn_word >> 16) & 0x1f); nocomma = 0; } else fprintf (stream, "r%d", (insn_word >> 16) & 0x1f); break; case RB : fprintf (stream, "r%d", (insn_word >> 11) & 0x1f); break; case SI : tmp = insn_word & 0xffff; if (tmp & 0x8000) tmp -= 0x10000; fprintf (stream, "%d", tmp); break; case UI : fprintf (stream, "%d", insn_word & 0xffff); break; case BF : fprintf (stream, "%d", (insn_word >> 23) & 0x7); break; case BFA : fprintf (stream, "%d", (insn_word >> 18) & 0x7); break; case BT : fprintf (stream, "%d", (insn_word >> 21) & 0x1f); break; case BA : fprintf (stream, "%d", (insn_word >> 16) & 0x1f); break; case BB : fprintf (stream, "%d", (insn_word >> 11) & 0x1f); break; case BO : fprintf (stream, "%d", (insn_word >> 21) & 0x1f); break; case BI : fprintf (stream, "%d", (insn_word >> 16) & 0x1f); break; case SH : fprintf (stream, "%d", (insn_word >> 11) & 0x1f); break; case MB : fprintf (stream, "0x%x", (insn_word >> 6) & 0x1f); break; case ME : fprintf (stream, "0x%x", (insn_word >> 1) & 0x1f); break; case SPR : fprintf (stream, "%d", (insn_word >> 16) & 0x1f); break; case DIS : nocomma = 1; tmp = insn_word & 0xffff; if (tmp & 0x8000) tmp -= 0x10000; fprintf (stream, "%d(", tmp); break; case FXM : fprintf (stream, "0x%x", (insn_word >> 12) & 0xff); break; case FRT : case FRS : fprintf (stream, "f%d", (insn_word >> 21) & 0x1f); break; case FRA : fprintf (stream, "f%d", (insn_word >> 16) & 0x1f); break; case FRB : fprintf (stream, "f%d", (insn_word >> 11) & 0x1f); break; case FRC : fprintf (stream, "f%d", (insn_word >> 6) & 0x1f); break; case FLM : fprintf (stream, "0x%x", (insn_word >> 17) & 0xff); break; case NB : fprintf (stream, "%d", (insn_word >> 11) & 0x1f); break; case I : fprintf (stream, "%d", (insn_word >> 12) & 0xf); break; default : fprintf (stream, "{Internal error: Unknown operand format identifier %d}", *pp); } ++pp; if (*pp != '\0' && !nocomma) fputc(',', stream); } }