| /* $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 <stdio.h> |
| #include <stdint.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <sys/cdefs.h> |
| |
| #include <sys/types.h> |
| #include "mips_opcode.h" |
| |
| #include <cutils/log.h> |
| |
| static char *sprintf_buffer; |
| static int sprintf_buf_len; |
| |
| |
| typedef uint64_t db_addr_t; |
| static void db_printf(const char* fmt, ...); |
| |
| static const char * const op_name[64] = { |
| /* 0 */ "spec", "bcond", "j", "jal", "beq", "bne", "blez", "bgtz", |
| /* 8 */ "pop10", "addiu", "slti", "sltiu", "andi", "ori", "xori", "aui", |
| /*16 */ "cop0", "cop1", "cop2", "?", "?", "?", "pop26", "pop27", |
| /*24 */ "pop30", "daddiu", "?", "?", "?", "daui", "msa", "op37", |
| /*32 */ "lb", "lh", "?", "lw", "lbu", "lhu", "?", "lwu", |
| /*40 */ "sb", "sh", "?", "sw", "?", "?", "?", "?", |
| /*48 */ "?", "lwc1", "bc", "?", "?", "ldc1", "pop66", "ld", |
| /*56 */ "?", "swc1", "balc", "pcrel", "?", "sdc1", "pop76", "sd" |
| }; |
| |
| static const char * const spec_name[64] = { |
| /* 0 */ "sll", "?", "srl", "sra", "sllv", "?", "srlv", "srav", |
| /* 8 */ "?", "jalr", "?", "?", "syscall", "break", "sdbpp", "sync", |
| /*16 */ "clz", "clo", "dclz", "dclo", "dsllv", "dlsa", "dsrlv", "dsrav", |
| /*24 */ "sop30", "sop31", "sop32", "sop33", "sop34", "sop35", "sop36", "sop37", |
| /*32 */ "add", "addu", "sub", "subu", "and", "or", "xor", "nor", |
| /*40 */ "?", "?", "slt", "sltu", "dadd", "daddu", "dsub", "dsubu", |
| /*48 */ "tge", "tgeu", "tlt", "tltu", "teq", "seleqz", "tne", "selnez", |
| /*56 */ "dsll", "?", "dsrl", "dsra", "dsll32", "?", "dsrl32", "dsra32" |
| }; |
| |
| static const char * const bcond_name[32] = { |
| /* 0 */ "bltz", "bgez", "?", "?", "?", "?", "dahi", "?", |
| /* 8 */ "?", "?", "?", "?", "?", "?", "?", "?", |
| /*16 */ "nal", "bal", "?", "?", "?", "?", "?", "sigrie", |
| /*24 */ "?", "?", "?", "?", "?", "?", "dati", "synci", |
| }; |
| |
| 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" |
| }; |
| |
| static char * const mips_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" |
| }; |
| |
| static char * alt_arm_reg_name[32] = { // hacked names for comparison with ARM code |
| "zero", "at", "r0", "r1", "r2", "r3", "r4", "r5", |
| "r6", "r7", "r8", "r9", "r10", "r11", "r12", "r13", |
| "r14", "r15", "at2", "cmp", "s4", "s5", "s6", "s7", |
| "t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra" |
| }; |
| |
| static char ** reg_name = &mips_reg_name[0]; |
| |
| 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); |
| db_addr_t mips_disassem(db_addr_t loc, char *di_buffer, int alt_dis_format); |
| |
| |
| /* |
| * Disassemble instruction 'insn' nominally at 'loc'. |
| * 'loc' may in fact contain a breakpoint instruction. |
| */ |
| static 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; |
| } |
| if (i.word == 0x0080) { |
| db_printf("NIY"); |
| break; |
| } |
| if (i.word == 0x00c0) { |
| db_printf("NOT IMPL"); |
| break; |
| } |
| /* Special cases -------------------------------------------------- |
| * "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) || |
| (i.RType.func == OP_OR && i.RType.rt == 0) ) { |
| db_printf("move\t%s,%s", |
| reg_name[i.RType.rd], |
| reg_name[i.RType.rs]); |
| break; |
| } |
| |
| if (i.RType.func == OP_SRL && (i.RType.rs & 1) == 1) { |
| db_printf("rotr\t%s,%s,%d", reg_name[i.RType.rd], |
| reg_name[i.RType.rt], i.RType.shamt); |
| break; |
| } |
| if (i.RType.func == OP_SRLV && (i.RType.shamt & 1) == 1) { |
| db_printf("rotrv\t%s,%s,%s", reg_name[i.RType.rd], |
| reg_name[i.RType.rt], reg_name[i.RType.rs]); |
| break; |
| } |
| |
| if (i.RType.func == OP_SOP30) { |
| if (i.RType.shamt == OP_MUL) { |
| db_printf("mul"); |
| } else if (i.RType.shamt == OP_MUH) { |
| db_printf("muh"); |
| } |
| db_printf("\t%s,%s,%s", reg_name[i.RType.rd], |
| reg_name[i.RType.rs], reg_name[i.RType.rt]); |
| break; |
| } |
| if (i.RType.func == OP_SOP31) { |
| if (i.RType.shamt == OP_MUL) { |
| db_printf("mulu"); |
| } else if (i.RType.shamt == OP_MUH) { |
| db_printf("muhu"); |
| } |
| db_printf("\t%s,%s,%s", reg_name[i.RType.rd], |
| reg_name[i.RType.rs], reg_name[i.RType.rt]); |
| break; |
| } |
| |
| if (i.RType.func == OP_JALR && i.RType.rd == 0) { |
| db_printf("jr\t%s", reg_name[i.RType.rs]); |
| bdslot = true; |
| 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_CLZ: |
| case OP_CLO: |
| case OP_DCLZ: |
| case OP_DCLO: |
| db_printf("\t%s,%s", |
| reg_name[i.RType.rd], |
| reg_name[i.RType.rs]); |
| break; |
| |
| case OP_JALR: |
| db_printf("\t"); |
| if (i.RType.rd != 31) { |
| db_printf("%s,", reg_name[i.RType.rd]); |
| } |
| db_printf("%s", reg_name[i.RType.rs]); |
| bdslot = true; |
| 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_SPECIAL3: |
| if (i.RType.func == OP_EXT) |
| db_printf("ext\t%s,%s,%d,%d", |
| reg_name[i.RType.rt], |
| reg_name[i.RType.rs], |
| i.RType.shamt, |
| i.RType.rd+1); |
| else if (i.RType.func == OP_DEXT) |
| db_printf("dext\t%s,%s,%d,%d", |
| reg_name[i.RType.rt], |
| reg_name[i.RType.rs], |
| i.RType.shamt, |
| i.RType.rd+1); |
| else if (i.RType.func == OP_DEXTM) |
| db_printf("dextm\t%s,%s,%d,%d", |
| reg_name[i.RType.rt], |
| reg_name[i.RType.rs], |
| i.RType.shamt, |
| i.RType.rd+33); |
| else if (i.RType.func == OP_DEXTU) |
| db_printf("dextu\t%s,%s,%d,%d", |
| reg_name[i.RType.rt], |
| reg_name[i.RType.rs], |
| i.RType.shamt+32, |
| i.RType.rd+1); |
| else if (i.RType.func == OP_INS) |
| db_printf("ins\t%s,%s,%d,%d", |
| reg_name[i.RType.rt], |
| reg_name[i.RType.rs], |
| i.RType.shamt, |
| i.RType.rd-i.RType.shamt+1); |
| else if (i.RType.func == OP_DINS) |
| db_printf("dins\t%s,%s,%d,%d", |
| reg_name[i.RType.rt], |
| reg_name[i.RType.rs], |
| i.RType.shamt, |
| i.RType.rd-i.RType.shamt+1); |
| else if (i.RType.func == OP_DINSM) |
| db_printf("dinsm\t%s,%s,%d,%d", |
| reg_name[i.RType.rt], |
| reg_name[i.RType.rs], |
| i.RType.shamt, |
| i.RType.rd-i.RType.shamt+33); |
| else if (i.RType.func == OP_DINSU) |
| db_printf("dinsu\t%s,%s,%d,%d", |
| reg_name[i.RType.rt], |
| reg_name[i.RType.rs], |
| i.RType.shamt+32, |
| i.RType.rd-i.RType.shamt+1); |
| else if (i.RType.func == OP_BSHFL && i.RType.shamt == OP_WSBH) |
| db_printf("wsbh\t%s,%s", |
| reg_name[i.RType.rd], |
| reg_name[i.RType.rt]); |
| else if (i.RType.func == OP_BSHFL && i.RType.shamt == OP_SEB) |
| db_printf("seb\t%s,%s", |
| reg_name[i.RType.rd], |
| reg_name[i.RType.rt]); |
| else if (i.RType.func == OP_BSHFL && i.RType.shamt == OP_SEH) |
| db_printf("seh\t%s,%s", |
| reg_name[i.RType.rd], |
| reg_name[i.RType.rt]); |
| else if (i.RType.func == OP_RDHWR) |
| db_printf("rdhwr\t%s,%s", |
| reg_name[i.RType.rd], |
| reg_name[i.RType.rt]); |
| else |
| db_printf("Unknown"); |
| 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_BGTZ: |
| db_printf("%s\t%s,", op_name[i.IType.op], |
| reg_name[i.IType.rs]); |
| goto pr_displ; |
| |
| case OP_BEQ: |
| if (i.IType.rs == 0 && i.IType.rt == 0) { |
| db_printf("b\t"); |
| goto pr_displ; |
| } |
| /* FALLTHROUGH */ |
| case OP_BNE: |
| 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 & 0xFFFFFFFFF0000000) | (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_AUI: |
| if (i.IType.rs == 0) { |
| db_printf("lui\t%s,0x%x", reg_name[i.IType.rt], |
| i.IType.imm); |
| } else { |
| 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); |
| } |
| break; |
| |
| 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(" bd: "); |
| // mips_disassem(loc+4); |
| // return (loc + 8); |
| // } |
| return (loc + 4); |
| } |
| |
| static void |
| print_addr(db_addr_t loc) |
| { |
| db_printf("0x%08lx", loc); |
| } |
| |
| static void db_printf(const char* fmt, ...) |
| { |
| int cnt; |
| va_list argp; |
| va_start(argp, fmt); |
| if (sprintf_buffer) { |
| cnt = vsnprintf(sprintf_buffer, sprintf_buf_len, fmt, argp); |
| sprintf_buffer += cnt; |
| sprintf_buf_len -= cnt; |
| } else { |
| vprintf(fmt, argp); |
| } |
| } |
| |
| /* |
| * Disassemble instruction at 'loc'. |
| * 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 |
| mips_disassem(db_addr_t loc, char *di_buffer, int alt_dis_format) |
| { |
| u_int32_t instr; |
| |
| if (alt_dis_format) { // use ARM register names for disassembly |
| reg_name = &alt_arm_reg_name[0]; |
| } |
| |
| sprintf_buffer = di_buffer; // quick 'n' dirty printf() vs sprintf() |
| sprintf_buf_len = 39; // should be passed in |
| |
| instr = *(u_int32_t *)loc; |
| return (db_disasm_insn(instr, loc, false)); |
| } |
