526 lines
12 KiB
C
526 lines
12 KiB
C
/* disassemble sparc instructions for objdump
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Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
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This file is part of the binutils.
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The binutils are free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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The binutils are distributed in the hope that they will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the binutils; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* $Id$ */
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#include "bfd.h"
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#include "sysdep.h"
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#include <stdio.h>
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#include "sparc-opcode.h"
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extern int fputs();
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extern int print_address();
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static char *reg_names[] =
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{ "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
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"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
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"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
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"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7",
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"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
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"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
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"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
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"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
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"y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr" };
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#define freg_names (®_names[4 * 8])
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union sparc_insn
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{
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unsigned long int code;
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struct
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{
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unsigned int _OP:2;
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#define op ldst._OP
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unsigned int _RD:5;
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#define rd ldst._RD
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unsigned int op3:6;
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unsigned int _RS1:5;
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#define rs1 ldst._RS1
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unsigned int i:1;
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unsigned int _ASI:8;
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#define asi ldst._ASI
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unsigned int _RS2:5;
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#define rs2 ldst._RS2
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#define shcnt rs2
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} ldst;
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struct
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{
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unsigned int _OP:2, _RD:5, op3:6, _RS1:5, i:1;
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unsigned int IMM13:13;
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#define imm13 IMM13.IMM13
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} IMM13;
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struct
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{
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unsigned int _OP:2;
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unsigned int a:1;
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unsigned int cond:4;
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unsigned int op2:3;
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unsigned int DISP22:22;
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#define disp22 branch.DISP22
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} branch;
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#ifndef NO_V9
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struct
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{
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unsigned int _OP:2, _RD:5, op3:6, _RS1:5;
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unsigned int DISP14:14;
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#define disp14 DISP14.DISP14
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} DISP14;
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struct
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{
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unsigned int _OP:2;
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unsigned int a:1;
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unsigned int cond:4;
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unsigned int op2:3;
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unsigned int p:1;
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unsigned int DISP21:21;
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#define disp21 branch2.DISP21
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} branch2;
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#endif /* NO_V9 */
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#define imm22 disp22
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struct
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{
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unsigned int _OP:2;
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unsigned int _DISP30:30;
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#define disp30 call._DISP30
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} call;
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};
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/* Nonzero if INSN is the opcode for a delayed branch. */
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static int
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is_delayed_branch (insn)
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union sparc_insn insn;
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{
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unsigned int i;
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for (i = 0; i < NUMOPCODES; ++i)
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{
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const struct sparc_opcode *opcode = &sparc_opcodes[i];
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if ((opcode->match & insn.code) == opcode->match
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&& (opcode->lose & insn.code) == 0
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&& (opcode->flags&F_DELAYED))
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return 1;
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}
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return 0;
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}
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static int opcodes_sorted = 0;
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/* Print one instruction from MEMADDR on STREAM. */
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int
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print_insn_sparc (memaddr, buffer, stream)
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bfd_vma memaddr;
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bfd_byte *buffer;
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FILE *stream;
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{
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union sparc_insn insn;
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register unsigned int i;
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if (!opcodes_sorted)
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{
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static int compare_opcodes ();
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qsort ((char *) sparc_opcodes, NUMOPCODES,
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sizeof (sparc_opcodes[0]), compare_opcodes);
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opcodes_sorted = 1;
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}
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memcpy(&insn,buffer, sizeof (insn));
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for (i = 0; i < NUMOPCODES; ++i)
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{
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const struct sparc_opcode *opcode = &sparc_opcodes[i];
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if ((opcode->match & insn.code) == opcode->match
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&& (opcode->lose & insn.code) == 0)
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{
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/* Nonzero means that we have found an instruction which has
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the effect of adding or or'ing the imm13 field to rs1. */
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int imm_added_to_rs1 = 0;
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/* Nonzero means that we have found a plus sign in the args
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field of the opcode table. */
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int found_plus = 0;
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/* Do we have an 'or' instruction where rs1 is the same
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as rsd, and which has the i bit set? */
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if (opcode->match == 0x80102000
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&& insn.rs1 == insn.rd)
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imm_added_to_rs1 = 1;
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if (index (opcode->args, 'S') != 0)
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/* Reject the special case for `set'.
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The real `sethi' will match. */
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continue;
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if (insn.rs1 != insn.rd
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&& index (opcode->args, 'r') != 0)
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/* Can't do simple format if source and dest are different. */
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continue;
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fputs (opcode->name, stream);
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{
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register const char *s;
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if (opcode->args[0] != ',')
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fputs (" ", stream);
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for (s = opcode->args; *s != '\0'; ++s) {
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while (*s == ',') {
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fputs (",", stream);
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++s;
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switch (*s) {
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case 'a':
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fputs ("a", stream);
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++s;
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continue;
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#ifndef NO_V9
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case 'N':
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fputs("pn", stream);
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++s;
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continue;
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case 'T':
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fputs("pt", stream);
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++s;
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continue;
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#endif /* NO_V9 */
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default:
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break;
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} /* switch on arg */
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} /* while there are comma started args */
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fputs (" ", stream);
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switch (*s)
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{
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case '+':
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found_plus = 1;
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/* note fall-through */
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default:
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fprintf (stream, "%c", *s);
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break;
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case '#':
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fputs ("0", stream);
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break;
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#define reg(n) fprintf (stream, "%%%s", reg_names[n])
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case '1':
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case 'r':
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reg (insn.rs1);
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break;
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case '2':
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reg (insn.rs2);
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break;
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case 'd':
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reg (insn.rd);
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break;
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#undef reg
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#define freg(n) fprintf (stream, "%%%s", freg_names[n])
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case 'e':
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freg (insn.rs1);
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break;
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case 'f':
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freg (insn.rs2);
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break;
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case 'g':
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freg (insn.rd);
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break;
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#undef freg
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#define creg(n) fprintf (stream, "%%c%u", (unsigned int) (n))
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case 'b':
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creg (insn.rs1);
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break;
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case 'c':
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creg (insn.rs2);
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break;
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case 'D':
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creg (insn.rd);
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break;
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#undef creg
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case 'h':
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fprintf (stream, "%%hi(%#x)",
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(unsigned int) insn.imm22 << 10);
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break;
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case 'i':
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{
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/* We cannot trust the compiler to sign-extend
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when extracting the bitfield, hence the shifts. */
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int imm = ((int) insn.imm13 << 19) >> 19;
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/* Check to see whether we have a 1+i, and take
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note of that fact.
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Note: because of the way we sort the table,
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we will be matching 1+i rather than i+1,
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so it is OK to assume that i is after +,
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not before it. */
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if (found_plus)
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imm_added_to_rs1 = 1;
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if (imm <= 9)
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fprintf (stream, "%d", imm);
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else
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fprintf (stream, "%#x", (unsigned) imm);
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}
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break;
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#ifndef NO_V9
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case 'k':
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print_address ((bfd_vma)
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(memaddr
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+ (((int) insn.disp14 << 18) >> 18) * 4),
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stream);
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break;
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case 'K':
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print_address ((bfd_vma)
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(memaddr
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+ (((int) insn.disp21 << 11) >> 11) * 4),
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stream);
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break;
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case 'Y':
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fputs ("%amr", stream);
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break;
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#endif /* NO_V9 */
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case 'M':
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fprintf(stream, "%%asr%d", insn.rs1);
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break;
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case 'm':
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fprintf(stream, "%%asr%d", insn.rd);
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break;
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case 'L':
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print_address ((bfd_vma) memaddr + insn.disp30 * 4,
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stream);
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break;
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case 'l':
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if ((insn.code >> 22) == 0)
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/* Special case for `unimp'. Don't try to turn
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it's operand into a function offset. */
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fprintf (stream, "%#x",
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(unsigned) (((int) insn.disp22 << 10) >> 10));
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else
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/* We cannot trust the compiler to sign-extend
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when extracting the bitfield, hence the shifts. */
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print_address ((bfd_vma)
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(memaddr
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+ (((int) insn.disp22 << 10) >> 10) * 4),
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stream);
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break;
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case 'A':
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fprintf (stream, "(%d)", (int) insn.asi);
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break;
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case 'C':
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fputs ("%csr", stream);
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break;
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case 'F':
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fputs ("%fsr", stream);
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break;
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case 'p':
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fputs ("%psr", stream);
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break;
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case 'q':
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fputs ("%fq", stream);
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break;
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case 'Q':
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fputs ("%cq", stream);
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break;
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case 't':
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fputs ("%tbr", stream);
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break;
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case 'w':
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fputs ("%wim", stream);
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break;
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case 'y':
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fputs ("%y", stream);
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break;
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}
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}
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}
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/* If we are adding or or'ing something to rs1, then
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check to see whether the previous instruction was
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a sethi to the same register as in the sethi.
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If so, attempt to print the result of the add or
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or (in this context add and or do the same thing)
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and its symbolic value. */
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if (imm_added_to_rs1)
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{
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union sparc_insn prev_insn;
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int errcode;
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memcpy(&prev_insn, buffer -4, sizeof (prev_insn));
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if (errcode == 0)
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{
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/* If it is a delayed branch, we need to look at the
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instruction before the delayed branch. This handles
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sequences such as
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sethi %o1, %hi(_foo), %o1
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call _printf
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or %o1, %lo(_foo), %o1
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*/
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if (is_delayed_branch (prev_insn))
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memcpy(&prev_insn, buffer - 8, sizeof(prev_insn));
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}
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/* If there was a problem reading memory, then assume
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the previous instruction was not sethi. */
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if (errcode == 0)
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{
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/* Is it sethi to the same register? */
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if ((prev_insn.code & 0xc1c00000) == 0x01000000
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&& prev_insn.rd == insn.rs1)
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{
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fprintf (stream, "\t! ");
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/* We cannot trust the compiler to sign-extend
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when extracting the bitfield, hence the shifts. */
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print_address (((int) prev_insn.imm22 << 10)
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| (insn.imm13 << 19) >> 19, stream);
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}
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}
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}
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return sizeof (insn);
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}
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}
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fprintf (stream, "%#8x", insn.code);
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return sizeof (insn);
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}
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/* Compare opcodes A and B. */
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static int
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compare_opcodes (a, b)
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char *a, *b;
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{
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struct sparc_opcode *op0 = (struct sparc_opcode *) a;
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struct sparc_opcode *op1 = (struct sparc_opcode *) b;
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unsigned long int match0 = op0->match, match1 = op1->match;
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unsigned long int lose0 = op0->lose, lose1 = op1->lose;
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register unsigned int i;
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/* If a bit is set in both match and lose, there is something
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wrong with the opcode table. */
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if (match0 & lose0)
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{
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fprintf (stderr, "Internal error: bad sparc-opcode.h: \"%s\", %#.8lx, %#.8lx\n",
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op0->name, match0, lose0);
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op0->lose &= ~op0->match;
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lose0 = op0->lose;
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}
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if (match1 & lose1)
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{
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fprintf (stderr, "Internal error: bad sparc-opcode.h: \"%s\", %#.8lx, %#.8lx\n",
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op1->name, match1, lose1);
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op1->lose &= ~op1->match;
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lose1 = op1->lose;
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}
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/* Because the bits that are variable in one opcode are constant in
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another, it is important to order the opcodes in the right order. */
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for (i = 0; i < 32; ++i)
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{
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unsigned long int x = 1 << i;
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int x0 = (match0 & x) != 0;
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int x1 = (match1 & x) != 0;
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if (x0 != x1)
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return x1 - x0;
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}
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for (i = 0; i < 32; ++i)
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{
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unsigned long int x = 1 << i;
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int x0 = (lose0 & x) != 0;
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int x1 = (lose1 & x) != 0;
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if (x0 != x1)
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return x1 - x0;
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}
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/* They are functionally equal. So as long as the opcode table is
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valid, we can put whichever one first we want, on aesthetic grounds. */
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{
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int length_diff = strlen (op0->args) - strlen (op1->args);
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if (length_diff != 0)
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/* Put the one with fewer arguments first. */
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return length_diff;
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}
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/* Put 1+i before i+1. */
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{
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char *p0 = (char *) index(op0->args, '+');
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char *p1 = (char *) index(op1->args, '+');
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if (p0 && p1)
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{
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/* There is a plus in both operands. Note that a plus
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sign cannot be the first character in args,
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so the following [-1]'s are valid. */
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if (p0[-1] == 'i' && p1[1] == 'i')
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/* op0 is i+1 and op1 is 1+i, so op1 goes first. */
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return 1;
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if (p0[1] == 'i' && p1[-1] == 'i')
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/* op0 is 1+i and op1 is i+1, so op0 goes first. */
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return -1;
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}
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}
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/* They are, as far as we can tell, identical.
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Since qsort may have rearranged the table partially, there is
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no way to tell which one was first in the opcode table as
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written, so just say there are equal. */
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return 0;
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}
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