The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/mips/mips/db_disasm.c

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    1 /*      $OpenBSD: db_disasm.c,v 1.1 1998/03/16 09:03:24 pefo Exp $      */
    2 /*-
    3  * SPDX-License-Identifier: BSD-4-Clause
    4  *
    5  * Copyright (c) 1991, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * This code is derived from software contributed to Berkeley by
    9  * Ralph Campbell.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *      This product includes software developed by the University of
   22  *      California, Berkeley and its contributors.
   23  * 4. Neither the name of the University nor the names of its contributors
   24  *    may be used to endorse or promote products derived from this software
   25  *    without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   37  * SUCH DAMAGE.
   38  *
   39  *      from: @(#)kadb.c        8.1 (Berkeley) 6/10/93
   40  *      Id: db_disasm.c,v 1.1 1998/03/16 09:03:24 pefo Exp
   41  *      JNPR: db_disasm.c,v 1.1 2006/08/07 05:38:57 katta
   42  */
   43 
   44 #include <sys/cdefs.h>
   45 __FBSDID("$FreeBSD: stable/12/sys/mips/mips/db_disasm.c 325966 2017-11-18 14:26:50Z pfg $");
   46 
   47 #include <sys/param.h>
   48 #include <vm/vm_param.h>
   49 #include <vm/vm.h>
   50 #include <vm/pmap.h>
   51 #include <sys/systm.h>
   52 
   53 #include <machine/mips_opcode.h>
   54 #include <machine/db_machdep.h>
   55 #include <ddb/ddb.h>
   56 #include <ddb/db_output.h>
   57 
   58 static char *op_name[64] = {
   59 /* 0 */ "spec", "bcond","j",    "jal",  "beq",  "bne",  "blez", "bgtz",
   60 /* 8 */ "addi", "addiu","slti", "sltiu","andi", "ori",  "xori", "lui",
   61 /*16 */ "cop0", "cop1", "cop2", "cop3", "beql", "bnel", "blezl","bgtzl",
   62 /*24 */ "daddi","daddiu","ldl", "ldr",  "op34", "op35", "op36", "op37",
   63 /*32 */ "lb",   "lh",   "lwl",  "lw",   "lbu",  "lhu",  "lwr",  "lwu",
   64 /*40 */ "sb",   "sh",   "swl",  "sw",   "sdl",  "sdr",  "swr",  "cache",
   65 /*48 */ "ll",   "lwc1", "lwc2", "lwc3", "lld",  "ldc1", "ldc2", "ld",
   66 /*56 */ "sc",   "swc1", "swc2", "swc3", "scd",  "sdc1", "sdc2", "sd"
   67 };
   68 
   69 static char *spec_name[64] = {
   70 /* 0 */ "sll",  "spec01","srl", "sra",  "sllv", "spec05","srlv","srav",
   71 /* 8 */ "jr",   "jalr", "spec12","spec13","syscall","break","spec16","sync",
   72 /*16 */ "mfhi", "mthi", "mflo", "mtlo", "dsllv","spec25","dsrlv","dsrav",
   73 /*24 */ "mult", "multu","div",  "divu", "dmult","dmultu","ddiv","ddivu",
   74 /*32 */ "add",  "addu", "sub",  "subu", "and",  "or",   "xor",  "nor",
   75 /*40 */ "spec50","spec51","slt","sltu", "dadd","daddu","dsub","dsubu",
   76 /*48 */ "tge","tgeu","tlt","tltu","teq","spec65","tne","spec67",
   77 /*56 */ "dsll","spec71","dsrl","dsra","dsll32","spec75","dsrl32","dsra32"
   78 };
   79 
   80 static char *bcond_name[32] = {
   81 /* 0 */ "bltz", "bgez", "bltzl", "bgezl", "?", "?", "?", "?",
   82 /* 8 */ "tgei", "tgeiu", "tlti", "tltiu", "teqi", "?", "tnei", "?",
   83 /*16 */ "bltzal", "bgezal", "bltzall", "bgezall", "?", "?", "?", "?",
   84 /*24 */ "?", "?", "?", "?", "?", "?", "?", "?",
   85 };
   86 
   87 static char *cop1_name[64] = {
   88 /* 0 */ "fadd", "fsub", "fmpy", "fdiv", "fsqrt","fabs", "fmov", "fneg",
   89 /* 8 */ "fop08","fop09","fop0a","fop0b","fop0c","fop0d","fop0e","fop0f",
   90 /*16 */ "fop10","fop11","fop12","fop13","fop14","fop15","fop16","fop17",
   91 /*24 */ "fop18","fop19","fop1a","fop1b","fop1c","fop1d","fop1e","fop1f",
   92 /*32 */ "fcvts","fcvtd","fcvte","fop23","fcvtw","fop25","fop26","fop27",
   93 /*40 */ "fop28","fop29","fop2a","fop2b","fop2c","fop2d","fop2e","fop2f",
   94 /*48 */ "fcmp.f","fcmp.un","fcmp.eq","fcmp.ueq","fcmp.olt","fcmp.ult",
   95         "fcmp.ole","fcmp.ule",
   96 /*56 */ "fcmp.sf","fcmp.ngle","fcmp.seq","fcmp.ngl","fcmp.lt","fcmp.nge",
   97         "fcmp.le","fcmp.ngt"
   98 };
   99 
  100 static char *fmt_name[16] = {
  101         "s",    "d",    "e",    "fmt3",
  102         "w",    "fmt5", "fmt6", "fmt7",
  103         "fmt8", "fmt9", "fmta", "fmtb",
  104         "fmtc", "fmtd", "fmte", "fmtf"
  105 };
  106 
  107 static char *reg_name[32] = {
  108         "zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
  109 #if defined(__mips_n32) || defined(__mips_n64)
  110         "a4",   "a5",   "a6",   "a7",   "t0",   "t1",   "t2",   "t3",
  111 #else
  112         "t0",   "t1",   "t2",   "t3",   "t4",   "t5",   "t6",   "t7",
  113 #endif
  114         "s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
  115         "t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
  116 };
  117 
  118 static char *c0_opname[64] = {
  119         "c0op00","tlbr",  "tlbwi", "c0op03","c0op04","c0op05","tlbwr", "c0op07",
  120         "tlbp", "c0op11","c0op12","c0op13","c0op14","c0op15","c0op16","c0op17",
  121         "rfe",  "c0op21","c0op22","c0op23","c0op24","c0op25","c0op26","c0op27",
  122         "eret","c0op31","c0op32","c0op33","c0op34","c0op35","c0op36","c0op37",
  123         "c0op40","c0op41","c0op42","c0op43","c0op44","c0op45","c0op46","c0op47",
  124         "c0op50","c0op51","c0op52","c0op53","c0op54","c0op55","c0op56","c0op57",
  125         "c0op60","c0op61","c0op62","c0op63","c0op64","c0op65","c0op66","c0op67",
  126         "c0op70","c0op71","c0op72","c0op73","c0op74","c0op75","c0op77","c0op77",
  127 };
  128 
  129 static char *c0_reg[32] = {
  130         "index","random","tlblo0","tlblo1","context","tlbmask","wired","c0r7",
  131         "badvaddr","count","tlbhi","c0r11","sr","cause","epc",  "prid",
  132         "config","lladr","watchlo","watchhi","xcontext","c0r21","c0r22","c0r23",
  133         "c0r24","c0r25","ecc","cacheerr","taglo","taghi","errepc","c0r31"
  134 };
  135 
  136 static int md_printins(int ins, int mdbdot);
  137 
  138 db_addr_t
  139 db_disasm(db_addr_t loc, bool altfmt)
  140 
  141 {
  142         int ins;
  143 
  144         if (vtophys((vm_offset_t)loc)) {
  145                 db_read_bytes((vm_offset_t)loc, (size_t)sizeof(int),
  146                     (char *)&ins);
  147                 md_printins(ins, loc);
  148         }
  149 
  150         return (loc + sizeof(int));
  151 } 
  152 
  153 /* ARGSUSED */
  154 static int
  155 md_printins(int ins, int mdbdot)
  156 {
  157         InstFmt i;
  158         int delay = 0;
  159 
  160         i.word = ins;
  161 
  162         switch (i.JType.op) {
  163         case OP_SPECIAL:
  164                 if (i.word == 0) {
  165                         db_printf("nop");
  166                         break;
  167                 }
  168                 if (i.RType.func == OP_ADDU && i.RType.rt == 0) {
  169                         db_printf("move\t%s,%s",
  170                             reg_name[i.RType.rd], reg_name[i.RType.rs]);
  171                         break;
  172                 }
  173                 db_printf("%s", spec_name[i.RType.func]);
  174                 switch (i.RType.func) {
  175                 case OP_SLL:
  176                 case OP_SRL:
  177                 case OP_SRA:
  178                 case OP_DSLL:
  179                 case OP_DSRL:
  180                 case OP_DSRA:
  181                 case OP_DSLL32:
  182                 case OP_DSRL32:
  183                 case OP_DSRA32:
  184                         db_printf("\t%s,%s,%d", reg_name[i.RType.rd],
  185                             reg_name[i.RType.rt], i.RType.shamt);
  186                         break;
  187 
  188                 case OP_SLLV:
  189                 case OP_SRLV:
  190                 case OP_SRAV:
  191                 case OP_DSLLV:
  192                 case OP_DSRLV:
  193                 case OP_DSRAV:
  194                         db_printf("\t%s,%s,%s", reg_name[i.RType.rd],
  195                             reg_name[i.RType.rt], reg_name[i.RType.rs]);
  196                         break;
  197 
  198                 case OP_MFHI:
  199                 case OP_MFLO:
  200                         db_printf("\t%s", reg_name[i.RType.rd]);
  201                         break;
  202 
  203                 case OP_JR:
  204                 case OP_JALR:
  205                         delay = 1;
  206                         /* FALLTHROUGH */
  207                 case OP_MTLO:
  208                 case OP_MTHI:
  209                         db_printf("\t%s", reg_name[i.RType.rs]);
  210                         break;
  211 
  212                 case OP_MULT:
  213                 case OP_MULTU:
  214                 case OP_DMULT:
  215                 case OP_DMULTU:
  216                 case OP_DIV:
  217                 case OP_DIVU:
  218                 case OP_DDIV:
  219                 case OP_DDIVU:
  220                         db_printf("\t%s,%s",
  221                             reg_name[i.RType.rs], reg_name[i.RType.rt]);
  222                         break;
  223 
  224                 case OP_SYSCALL:
  225                 case OP_SYNC:
  226                         break;
  227 
  228                 case OP_BREAK:
  229                         db_printf("\t%d", (i.RType.rs << 5) | i.RType.rt);
  230                         break;
  231 
  232                 default:
  233                         db_printf("\t%s,%s,%s", reg_name[i.RType.rd],
  234                             reg_name[i.RType.rs], reg_name[i.RType.rt]);
  235                 }
  236                 break;
  237 
  238         case OP_BCOND:
  239                 db_printf("%s\t%s,", bcond_name[i.IType.rt],
  240                     reg_name[i.IType.rs]);
  241                 goto pr_displ;
  242 
  243         case OP_BLEZ:
  244         case OP_BLEZL:
  245         case OP_BGTZ:
  246         case OP_BGTZL:
  247                 db_printf("%s\t%s,", op_name[i.IType.op],
  248                     reg_name[i.IType.rs]);
  249                 goto pr_displ;
  250 
  251         case OP_BEQ:
  252         case OP_BEQL:
  253                 if (i.IType.rs == 0 && i.IType.rt == 0) {
  254                         db_printf("b\t");
  255                         goto pr_displ;
  256                 }
  257                 /* FALLTHROUGH */
  258         case OP_BNE:
  259         case OP_BNEL:
  260                 db_printf("%s\t%s,%s,", op_name[i.IType.op],
  261                     reg_name[i.IType.rs], reg_name[i.IType.rt]);
  262         pr_displ:
  263                 delay = 1;
  264                 db_printf("0x%08x", mdbdot + 4 + ((short)i.IType.imm << 2));
  265                 break;
  266 
  267         case OP_COP0:
  268                 switch (i.RType.rs) {
  269                 case OP_BCx:
  270                 case OP_BCy:
  271                         db_printf("bc0%c\t",
  272                             "ft"[i.RType.rt & COPz_BC_TF_MASK]);
  273                         goto pr_displ;
  274 
  275                 case OP_MT:
  276                         db_printf("mtc0\t%s,%s",
  277                             reg_name[i.RType.rt], c0_reg[i.RType.rd]);
  278                         break;
  279 
  280                 case OP_DMT:
  281                         db_printf("dmtc0\t%s,%s",
  282                             reg_name[i.RType.rt], c0_reg[i.RType.rd]);
  283                         break;
  284 
  285                 case OP_MF:
  286                         db_printf("mfc0\t%s,%s",
  287                             reg_name[i.RType.rt], c0_reg[i.RType.rd]);
  288                         break;
  289 
  290                 case OP_DMF:
  291                         db_printf("dmfc0\t%s,%s",
  292                             reg_name[i.RType.rt], c0_reg[i.RType.rd]);
  293                         break;
  294 
  295                 default:
  296                         db_printf("%s", c0_opname[i.FRType.func]);
  297                 }
  298                 break;
  299 
  300         case OP_COP1:
  301                 switch (i.RType.rs) {
  302                 case OP_BCx:
  303                 case OP_BCy:
  304                         db_printf("bc1%c\t",
  305                             "ft"[i.RType.rt & COPz_BC_TF_MASK]);
  306                         goto pr_displ;
  307 
  308                 case OP_MT:
  309                         db_printf("mtc1\t%s,f%d",
  310                             reg_name[i.RType.rt], i.RType.rd);
  311                         break;
  312 
  313                 case OP_MF:
  314                         db_printf("mfc1\t%s,f%d",
  315                             reg_name[i.RType.rt], i.RType.rd);
  316                         break;
  317 
  318                 case OP_CT:
  319                         db_printf("ctc1\t%s,f%d",
  320                             reg_name[i.RType.rt], i.RType.rd);
  321                         break;
  322 
  323                 case OP_CF:
  324                         db_printf("cfc1\t%s,f%d",
  325                             reg_name[i.RType.rt], i.RType.rd);
  326                         break;
  327 
  328                 default:
  329                         db_printf("%s.%s\tf%d,f%d,f%d",
  330                             cop1_name[i.FRType.func], fmt_name[i.FRType.fmt],
  331                             i.FRType.fd, i.FRType.fs, i.FRType.ft);
  332                 }
  333                 break;
  334 
  335         case OP_J:
  336         case OP_JAL:
  337                 db_printf("%s\t", op_name[i.JType.op]);
  338                 db_printf("0x%8x",(mdbdot & 0xF0000000) | (i.JType.target << 2));
  339                 delay = 1;
  340                 break;
  341 
  342         case OP_LWC1:
  343         case OP_SWC1:
  344                 db_printf("%s\tf%d,", op_name[i.IType.op], i.IType.rt);
  345                 goto loadstore;
  346 
  347         case OP_LB:
  348         case OP_LH:
  349         case OP_LW:
  350         case OP_LD:
  351         case OP_LBU:
  352         case OP_LHU:
  353         case OP_LWU:
  354         case OP_SB:
  355         case OP_SH:
  356         case OP_SW:
  357         case OP_SD:
  358                 db_printf("%s\t%s,", op_name[i.IType.op],
  359                     reg_name[i.IType.rt]);
  360         loadstore:
  361                 db_printf("%d(%s)", (short)i.IType.imm, reg_name[i.IType.rs]);
  362                 break;
  363 
  364         case OP_ORI:
  365         case OP_XORI:
  366                 if (i.IType.rs == 0) {
  367                         db_printf("li\t%s,0x%x",
  368                             reg_name[i.IType.rt], i.IType.imm);
  369                         break;
  370                 }
  371                 /* FALLTHROUGH */
  372         case OP_ANDI:
  373                 db_printf("%s\t%s,%s,0x%x", op_name[i.IType.op],
  374                     reg_name[i.IType.rt], reg_name[i.IType.rs], i.IType.imm);
  375                 break;
  376 
  377         case OP_LUI:
  378                 db_printf("%s\t%s,0x%x", op_name[i.IType.op],
  379                     reg_name[i.IType.rt], i.IType.imm);
  380                 break;
  381 
  382         case OP_ADDI:
  383         case OP_DADDI:
  384         case OP_ADDIU:
  385         case OP_DADDIU:
  386                 if (i.IType.rs == 0) {
  387                         db_printf("li\t%s,%d", reg_name[i.IType.rt],
  388                             (short)i.IType.imm);
  389                         break;
  390                 }
  391                 /* FALLTHROUGH */
  392         default:
  393                 db_printf("%s\t%s,%s,%d", op_name[i.IType.op],
  394                     reg_name[i.IType.rt], reg_name[i.IType.rs],
  395                     (short)i.IType.imm);
  396         }
  397         db_printf("\n");
  398         return (delay);
  399 }

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