NetBSD-5.0.2/sys/arch/mips/mips/db_disasm.c
/* $NetBSD: db_disasm.c,v 1.19 2007/02/28 04:21:53 thorpej Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)kadb.c 8.1 (Berkeley) 6/10/93
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: db_disasm.c,v 1.19 2007/02/28 04:21:53 thorpej Exp $");
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/param.h>
#include <machine/reg.h>
#include <machine/cpu.h>
#include <mips/mips_opcode.h>
/*#include <machine/param.h>*/
#include <machine/db_machdep.h>
#include <ddb/db_interface.h>
#include <ddb/db_output.h>
#include <ddb/db_extern.h>
#include <ddb/db_sym.h>
static const char * const op_name[64] = {
/* 0 */ "spec", "bcond","j", "jal", "beq", "bne", "blez", "bgtz",
/* 8 */ "addi", "addiu","slti", "sltiu","andi", "ori", "xori", "lui",
/*16 */ "cop0", "cop1", "cop2", "cop3", "beql", "bnel", "blezl","bgtzl",
/*24 */ "daddi","daddiu","ldl", "ldr", "op34", "op35", "op36", "op37",
/*32 */ "lb", "lh", "lwl", "lw", "lbu", "lhu", "lwr", "lwu",
/*40 */ "sb", "sh", "swl", "sw", "sdl", "sdr", "swr", "cache",
/*48 */ "ll", "lwc1", "lwc2", "lwc3", "lld", "ldc1", "ldc2", "ld",
/*56 */ "sc", "swc1", "swc2", "swc3", "scd", "sdc1", "sdc2", "sd"
};
static const char * const spec_name[64] = {
/* 0 */ "sll", "spec01","srl", "sra", "sllv", "spec05","srlv","srav",
/* 8 */ "jr", "jalr", "spec12","spec13","syscall","break","spec16","sync",
/*16 */ "mfhi", "mthi", "mflo", "mtlo", "dsllv","spec25","dsrlv","dsrav",
/*24 */ "mult", "multu","div", "divu", "dmult","dmultu","ddiv","ddivu",
/*32 */ "add", "addu", "sub", "subu", "and", "or", "xor", "nor",
/*40 */ "spec50","spec51","slt","sltu", "dadd","daddu","dsub","dsubu",
/*48 */ "tge","tgeu","tlt","tltu","teq","spec65","tne","spec67",
/*56 */ "dsll","spec71","dsrl","dsra","dsll32","spec75","dsrl32","dsra32"
};
static const char * const spec2_name[4] = { /* QED RM4650, R5000, etc. */
/* 0 */ "mad", "madu", "mul", "spec3"
};
static const char * const bcond_name[32] = {
/* 0 */ "bltz", "bgez", "bltzl", "bgezl", "?", "?", "?", "?",
/* 8 */ "tgei", "tgeiu", "tlti", "tltiu", "teqi", "?", "tnei", "?",
/*16 */ "bltzal", "bgezal", "bltzall", "bgezall", "?", "?", "?", "?",
/*24 */ "?", "?", "?", "?", "?", "?", "?", "?",
};
static const char * const cop1_name[64] = {
/* 0 */ "fadd", "fsub", "fmpy", "fdiv", "fsqrt","fabs", "fmov", "fneg",
/* 8 */ "fop08","fop09","fop0a","fop0b","fop0c","fop0d","fop0e","fop0f",
/*16 */ "fop10","fop11","fop12","fop13","fop14","fop15","fop16","fop17",
/*24 */ "fop18","fop19","fop1a","fop1b","fop1c","fop1d","fop1e","fop1f",
/*32 */ "fcvts","fcvtd","fcvte","fop23","fcvtw","fop25","fop26","fop27",
/*40 */ "fop28","fop29","fop2a","fop2b","fop2c","fop2d","fop2e","fop2f",
/*48 */ "fcmp.f","fcmp.un","fcmp.eq","fcmp.ueq","fcmp.olt","fcmp.ult",
"fcmp.ole","fcmp.ule",
/*56 */ "fcmp.sf","fcmp.ngle","fcmp.seq","fcmp.ngl","fcmp.lt","fcmp.nge",
"fcmp.le","fcmp.ngt"
};
static const char * const fmt_name[16] = {
"s", "d", "e", "fmt3",
"w", "fmt5", "fmt6", "fmt7",
"fmt8", "fmt9", "fmta", "fmtb",
"fmtc", "fmtd", "fmte", "fmtf"
};
#if defined(__mips_n32) || defined(__mips_n64)
static const char * const reg_name[32] = {
"zero", "at", "v0", "v1", "a0", "a1", "a2", "a3",
"a4", "a5", "a6", "a7", "t0", "t1", "t2", "t3",
"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
"t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra"
};
#else
static const char * const reg_name[32] = {
"zero", "at", "v0", "v1", "a0", "a1", "a2", "a3",
"t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7",
"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
"t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra"
};
#endif /* __mips_n32 || __mips_n64 */
static const char * const c0_opname[64] = {
"c0op00","tlbr", "tlbwi", "c0op03","c0op04","c0op05","tlbwr", "c0op07",
"tlbp", "c0op11","c0op12","c0op13","c0op14","c0op15","c0op16","c0op17",
"rfe", "c0op21","c0op22","c0op23","c0op24","c0op25","c0op26","c0op27",
"eret", "c0op31","c0op32","c0op33","c0op34","c0op35","c0op36","c0op37",
"c0op40","c0op41","c0op42","c0op43","c0op44","c0op45","c0op46","c0op47",
"c0op50","c0op51","c0op52","c0op53","c0op54","c0op55","c0op56","c0op57",
"c0op60","c0op61","c0op62","c0op63","c0op64","c0op65","c0op66","c0op67",
"c0op70","c0op71","c0op72","c0op73","c0op74","c0op75","c0op77","c0op77",
};
static const char * const c0_reg[32] = {
"index", "random", "tlblo0", "tlblo1",
"context", "pagemask", "wired", "cp0r7",
"badvaddr", "count", "tlbhi", "compare",
"status", "cause", "epc", "prid",
"config", "lladdr", "watchlo", "watchhi",
"xcontext", "cp0r21", "cp0r22", "debug",
"depc", "perfcnt", "ecc", "cacheerr",
"taglo", "taghi", "errepc", "desave"
};
static void print_addr(db_addr_t);
/*
* Disassemble instruction at 'loc'. 'altfmt' specifies an
* (optional) alternate format (altfmt for vax: don't assume
* that each external label is a procedure entry mask).
* Return address of start of next instruction.
* Since this function is used by 'examine' and by 'step'
* "next instruction" does NOT mean the next instruction to
* be executed but the 'linear' next instruction.
*/
db_addr_t
db_disasm(db_addr_t loc, bool altfmt)
{
u_int32_t instr;
/*
* Take some care with addresses to not UTLB here as it
* loses the current debugging context. KSEG2 not checked.
*/
if (loc < MIPS_KSEG0_START) {
instr = fuword((void *)loc);
if (instr == 0xffffffff) {
/* "sd ra, -1(ra)" is unlikely */
db_printf("invalid address.\n");
return loc;
}
}
else {
instr = *(u_int32_t *)loc;
}
return (db_disasm_insn(instr, loc, altfmt));
}
/*
* Disassemble instruction 'insn' nominally at 'loc'.
* 'loc' may in fact contain a breakpoint instruction.
*/
db_addr_t
db_disasm_insn(int insn, db_addr_t loc, bool altfmt)
{
bool bdslot = false;
InstFmt i;
i.word = insn;
switch (i.JType.op) {
case OP_SPECIAL:
if (i.word == 0) {
db_printf("nop");
break;
}
/* XXX
* "addu" is a "move" only in 32-bit mode. What's the correct
* answer - never decode addu/daddu as "move"?
*/
if (i.RType.func == OP_ADDU && i.RType.rt == 0) {
db_printf("move\t%s,%s",
reg_name[i.RType.rd],
reg_name[i.RType.rs]);
break;
}
db_printf("%s", spec_name[i.RType.func]);
switch (i.RType.func) {
case OP_SLL:
case OP_SRL:
case OP_SRA:
case OP_DSLL:
case OP_DSRL:
case OP_DSRA:
case OP_DSLL32:
case OP_DSRL32:
case OP_DSRA32:
db_printf("\t%s,%s,%d",
reg_name[i.RType.rd],
reg_name[i.RType.rt],
i.RType.shamt);
break;
case OP_SLLV:
case OP_SRLV:
case OP_SRAV:
case OP_DSLLV:
case OP_DSRLV:
case OP_DSRAV:
db_printf("\t%s,%s,%s",
reg_name[i.RType.rd],
reg_name[i.RType.rt],
reg_name[i.RType.rs]);
break;
case OP_MFHI:
case OP_MFLO:
db_printf("\t%s", reg_name[i.RType.rd]);
break;
case OP_JR:
case OP_JALR:
db_printf("\t%s", reg_name[i.RType.rs]);
bdslot = true;
break;
case OP_MTLO:
case OP_MTHI:
db_printf("\t%s", reg_name[i.RType.rs]);
break;
case OP_MULT:
case OP_MULTU:
case OP_DMULT:
case OP_DMULTU:
case OP_DIV:
case OP_DIVU:
case OP_DDIV:
case OP_DDIVU:
db_printf("\t%s,%s",
reg_name[i.RType.rs],
reg_name[i.RType.rt]);
break;
case OP_SYSCALL:
case OP_SYNC:
break;
case OP_BREAK:
db_printf("\t%d", (i.RType.rs << 5) | i.RType.rt);
break;
default:
db_printf("\t%s,%s,%s",
reg_name[i.RType.rd],
reg_name[i.RType.rs],
reg_name[i.RType.rt]);
}
break;
case OP_SPECIAL2:
if (i.RType.func == OP_MUL)
db_printf("%s\t%s,%s,%s",
spec2_name[i.RType.func & 0x3],
reg_name[i.RType.rd],
reg_name[i.RType.rs],
reg_name[i.RType.rt]);
else
db_printf("%s\t%s,%s",
spec2_name[i.RType.func & 0x3],
reg_name[i.RType.rs],
reg_name[i.RType.rt]);
break;
case OP_BCOND:
db_printf("%s\t%s,", bcond_name[i.IType.rt],
reg_name[i.IType.rs]);
goto pr_displ;
case OP_BLEZ:
case OP_BLEZL:
case OP_BGTZ:
case OP_BGTZL:
db_printf("%s\t%s,", op_name[i.IType.op],
reg_name[i.IType.rs]);
goto pr_displ;
case OP_BEQ:
case OP_BEQL:
if (i.IType.rs == 0 && i.IType.rt == 0) {
db_printf("b\t");
goto pr_displ;
}
/* FALLTHROUGH */
case OP_BNE:
case OP_BNEL:
db_printf("%s\t%s,%s,", op_name[i.IType.op],
reg_name[i.IType.rs],
reg_name[i.IType.rt]);
pr_displ:
print_addr(loc + 4 + ((short)i.IType.imm << 2));
bdslot = true;
break;
case OP_COP0:
switch (i.RType.rs) {
case OP_BCx:
case OP_BCy:
db_printf("bc0%c\t",
"ft"[i.RType.rt & COPz_BC_TF_MASK]);
goto pr_displ;
case OP_MT:
db_printf("mtc0\t%s,%s",
reg_name[i.RType.rt],
c0_reg[i.RType.rd]);
break;
case OP_DMT:
db_printf("dmtc0\t%s,%s",
reg_name[i.RType.rt],
c0_reg[i.RType.rd]);
break;
case OP_MF:
db_printf("mfc0\t%s,%s",
reg_name[i.RType.rt],
c0_reg[i.RType.rd]);
break;
case OP_DMF:
db_printf("dmfc0\t%s,%s",
reg_name[i.RType.rt],
c0_reg[i.RType.rd]);
break;
default:
db_printf("%s", c0_opname[i.FRType.func]);
}
break;
case OP_COP1:
switch (i.RType.rs) {
case OP_BCx:
case OP_BCy:
db_printf("bc1%c\t",
"ft"[i.RType.rt & COPz_BC_TF_MASK]);
goto pr_displ;
case OP_MT:
db_printf("mtc1\t%s,f%d",
reg_name[i.RType.rt],
i.RType.rd);
break;
case OP_MF:
db_printf("mfc1\t%s,f%d",
reg_name[i.RType.rt],
i.RType.rd);
break;
case OP_CT:
db_printf("ctc1\t%s,f%d",
reg_name[i.RType.rt],
i.RType.rd);
break;
case OP_CF:
db_printf("cfc1\t%s,f%d",
reg_name[i.RType.rt],
i.RType.rd);
break;
default:
db_printf("%s.%s\tf%d,f%d,f%d",
cop1_name[i.FRType.func],
fmt_name[i.FRType.fmt],
i.FRType.fd, i.FRType.fs, i.FRType.ft);
}
break;
case OP_J:
case OP_JAL:
db_printf("%s\t", op_name[i.JType.op]);
print_addr((loc & 0xF0000000) | (i.JType.target << 2));
bdslot = true;
break;
case OP_LWC1:
case OP_SWC1:
db_printf("%s\tf%d,", op_name[i.IType.op],
i.IType.rt);
goto loadstore;
case OP_LB:
case OP_LH:
case OP_LW:
case OP_LD:
case OP_LBU:
case OP_LHU:
case OP_LWU:
case OP_SB:
case OP_SH:
case OP_SW:
case OP_SD:
db_printf("%s\t%s,", op_name[i.IType.op],
reg_name[i.IType.rt]);
loadstore:
db_printf("%d(%s)", (short)i.IType.imm,
reg_name[i.IType.rs]);
break;
case OP_ORI:
case OP_XORI:
if (i.IType.rs == 0) {
db_printf("li\t%s,0x%x",
reg_name[i.IType.rt],
i.IType.imm);
break;
}
/* FALLTHROUGH */
case OP_ANDI:
db_printf("%s\t%s,%s,0x%x", op_name[i.IType.op],
reg_name[i.IType.rt],
reg_name[i.IType.rs],
i.IType.imm);
break;
case OP_LUI:
db_printf("%s\t%s,0x%x", op_name[i.IType.op],
reg_name[i.IType.rt],
i.IType.imm);
break;
case OP_CACHE:
db_printf("%s\t0x%x,0x%x(%s)",
op_name[i.IType.op],
i.IType.rt,
i.IType.imm,
reg_name[i.IType.rs]);
break;
case OP_ADDI:
case OP_DADDI:
case OP_ADDIU:
case OP_DADDIU:
if (i.IType.rs == 0) {
db_printf("li\t%s,%d",
reg_name[i.IType.rt],
(short)i.IType.imm);
break;
}
/* FALLTHROUGH */
default:
db_printf("%s\t%s,%s,%d", op_name[i.IType.op],
reg_name[i.IType.rt],
reg_name[i.IType.rs],
(short)i.IType.imm);
}
db_printf("\n");
if (bdslot) {
db_printf("\t\tbdslot:\t");
db_disasm(loc+4, false);
return (loc + 8);
}
return (loc + 4);
}
static void
print_addr(db_addr_t loc)
{
db_expr_t diff;
db_sym_t sym;
const char *symname;
diff = INT_MAX;
symname = NULL;
sym = db_search_symbol(loc, DB_STGY_ANY, &diff);
db_symbol_values(sym, &symname, 0);
if (symname) {
if (diff == 0)
db_printf("%s", symname);
else
db_printf("<%s+%lx>", symname, diff);
db_printf("\t[addr:0x%08lx]", loc);
} else {
db_printf("0x%08lx", loc);
}
}