harvey/sys/src/libmach/vdb.c

/*
 * This file is part of the UCB release of Plan 9. It is subject to the license
 * terms in the LICENSE file found in the top-level directory of this
 * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
 * part of the UCB release of Plan 9, including this file, may be copied,
 * modified, propagated, or distributed except according to the terms contained
 * in the LICENSE file.
 */

#include <u.h>
#include <libc.h>
#include <bio.h>
#include <mach.h>
/*
 * Mips-specific debugger interface
 */

static	char	*mipsexcep(Map*, Rgetter);
static	int	mipsfoll(Map*, uint64_t, Rgetter, uint64_t*);
static	int	mipsinst(Map*, uint64_t, char, char*, int);
static	int	mipsdas(Map*, uint64_t, char*, int);
static	int	mipsinstlen(Map*, uint64_t);

/*
 *	Debugger interface
 */
Machdata mipsmach =
{
	{0, 0, 0, 0xD},		/* break point */
	4,			/* break point size */

	beswab,			/* short to local byte order */
	beswal,			/* long to local byte order */
	beswav,			/* vlong to local byte order */
	risctrace,		/* C traceback */
	riscframe,		/* Frame finder */
	mipsexcep,		/* print exception */
	0,			/* breakpoint fixup */
	beieeesftos,		/* single precision float printer */
	/*
	 * this works for doubles in memory, but FP register pairs have
	 * the words in little-endian order, so they will print as
	 * denormalised doubles.
	 */
	beieeedftos,		/* double precision float printer */
	mipsfoll,		/* following addresses */
	mipsinst,		/* print instruction */
	mipsdas,		/* dissembler */
	mipsinstlen,		/* instruction size */
};

Machdata mipsmachle =
{
	{0, 0, 0, 0xD},		/* break point */
	4,			/* break point size */

	leswab,			/* short to local byte order */
	leswal,			/* long to local byte order */
	leswav,			/* vlong to local byte order */
	risctrace,		/* C traceback */
	riscframe,		/* Frame finder */
	mipsexcep,		/* print exception */
	0,			/* breakpoint fixup */
	leieeesftos,		/* single precision float printer */
	leieeedftos,		/* double precision float printer */
	mipsfoll,		/* following addresses */
	mipsinst,		/* print instruction */
	mipsdas,		/* dissembler */
	mipsinstlen,		/* instruction size */
};

/*
 *	mips r4k little-endian
 */
Machdata mipsmach2le =
{
	{0, 0, 0, 0xD},		/* break point */
	4,			/* break point size */

	leswab,			/* short to local byte order */
	leswal,			/* long to local byte order */
	leswav,			/* vlong to local byte order */
	risctrace,		/* C traceback */
	riscframe,		/* Frame finder */
	mipsexcep,		/* print exception */
	0,			/* breakpoint fixup */
	leieeesftos,		/* single precision float printer */
	leieeedftos,		/* double precision float printer */
	mipsfoll,		/* following addresses */
	mipsinst,		/* print instruction */
	mipsdas,		/* dissembler */
	mipsinstlen,		/* instruction size */
};

/*
 *	mips r4k big-endian
 */
Machdata mipsmach2be =
{
	{0, 0, 0, 0xD},		/* break point */
	4,			/* break point size */

	beswab,			/* short to local byte order */
	beswal,			/* long to local byte order */
	beswav,			/* vlong to local byte order */
	risctrace,		/* C traceback */
	riscframe,		/* Frame finder */
	mipsexcep,		/* print exception */
	0,			/* breakpoint fixup */
	beieeesftos,		/* single precision float printer */
	beieeedftos,		/* double precision float printer */
	mipsfoll,		/* following addresses */
	mipsinst,		/* print instruction */
	mipsdas,		/* dissembler */
	mipsinstlen,		/* instruction size */
};


static char *excname[] =
{
	"external interrupt",
	"TLB modification",
	"TLB miss (load or fetch)",
	"TLB miss (store)",
	"address error (load or fetch)",
	"address error (store)",
	"bus error (fetch)",
	"bus error (data load or store)",
	"system call",
	"breakpoint",
	"reserved instruction",
	"coprocessor unusable",
	"arithmetic overflow",
	"undefined 13",
	"undefined 14",
	"system call",
	/* the following is made up */
	"floating point exception"		/* FPEXC */
};

static char*
mipsexcep(Map *map, Rgetter rget)
{
	int e;
	int32_t c;

	c = (*rget)(map, "CAUSE");
	/* i don't think this applies to any current machines */
	if(0 && c & 0x00002000)	/* INTR3 */
		e = 16;		/* Floating point exception */
	else
		e = (c>>2)&0x0F;
	return excname[e];
}

	/* mips disassembler and related functions */

static	char FRAMENAME[] = ".frame";

typedef struct {
	uint64_t addr;
	uint8_t op;			/* bits 31-26 */
	uint8_t rs;			/* bits 25-21 */
	uint8_t rt;			/* bits 20-16 */
	uint8_t rd;			/* bits 15-11 */
	uint8_t sa;			/* bits 10-6 */
	uint8_t function;			/* bits 5-0 */
	int32_t immediate;			/* bits 15-0 */
	uint32_t cofun;			/* bits 24-0 */
	uint32_t target;			/* bits 25-0 */
	int32_t w0;
	int32_t w1;
	int size;			/* instruction size */
	char *curr;			/* fill point in buffer */
	char *end;			/* end of buffer */
	char *err;			/* error message */
} Instr;

static Map *mymap;

static int
decode(uint64_t pc, Instr *i)
{
	uint32_t w;

	if (get4(mymap, pc, &w) < 0) {
		werrstr("can't read instruction: %r");
		return -1;
	}

	i->addr = pc;
	i->size = 1;
	i->op = (w >> 26) & 0x3F;
	i->rs = (w >> 21) & 0x1F;
	i->rt = (w >> 16) & 0x1F;
	i->rd = (w >> 11) & 0x1F;
	i->sa = (w >> 6) & 0x1F;
	i->function = w & 0x3F;
	i->immediate = w & 0x0000FFFF;
	if (i->immediate & 0x8000)
		i->immediate |= ~0x0000FFFF;
	i->cofun = w & 0x01FFFFFF;
	i->target = w & 0x03FFFFFF;
	i->w0 = w;
	return 1;
}

static int
mkinstr(uint64_t pc, Instr *i)
{
	Instr x;

	if (decode(pc, i) < 0)
		return -1;
	/*
	 * if it's a LUI followed by an ORI,
	 * it's an immediate load of a large constant.
	 * fix the LUI immediate in any case.
	 */
	if (i->op == 0x0F) {
		if (decode(pc+4, &x) < 0)
			return 0;
		i->immediate <<= 16;
		if (x.op == 0x0D && x.rs == x.rt && x.rt == i->rt) {
			i->immediate |= (x.immediate & 0xFFFF);
			i->w1 = x.w0;
			i->size++;
			return 1;
		}
	}
	/*
	 * if it's a LWC1 followed by another LWC1
	 * into an adjacent register, it's a load of
	 * a floating point double.
	 */
	else if (i->op == 0x31 && (i->rt & 0x01)) {
		if (decode(pc+4, &x) < 0)
			return 0;
		if (x.op == 0x31 && x.rt == (i->rt - 1) && x.rs == i->rs) {
			i->rt -= 1;
			i->w1 = x.w0;
			i->size++;
			return 1;
		}
	}
	/*
	 * similarly for double stores
	 */
	else if (i->op == 0x39 && (i->rt & 0x01)) {
		if (decode(pc+4, &x) < 0)
			return 0;
		if (x.op == 0x39 && x.rt == (i->rt - 1) && x.rs == i->rs) {
			i->rt -= 1;
			i->w1 = x.w0;
			i->size++;
		}
	}
	return 1;
}

#pragma	varargck	argpos	bprint		2

static void
bprint(Instr *i, char *fmt, ...)
{
	va_list arg;

	va_start(arg, fmt);
	i->curr = vseprint(i->curr, i->end, fmt, arg);
	va_end(arg);
}

typedef struct Opcode Opcode;

struct Opcode {
	char *mnemonic;
	void (*f)(Opcode *, Instr *);
	char *ken;
};

static void format(char *, Instr *, char *);

static void
branch(Opcode *o, Instr *i)
{
	if (i->rs == 0 && i->rt == 0)
		format("JMP", i, "%b");
	else if (i->rs == 0)
		format(o->mnemonic, i, "R%t,%b");
	else if (i->rt < 2)
		format(o->mnemonic, i, "R%s,%b");
	else
		format(o->mnemonic, i, "R%s,R%t,%b");
}

static void
addi(Opcode *o, Instr *i)
{
	if (i->rs == i->rt)
		format(o->mnemonic, i, "%i,R%t");
	else if (i->rs == 0)
		format("MOVW", i, "%i,R%t");
	else if (i->rs == 30) {
		bprint(i, "MOVW\t$");
		i->curr += symoff(i->curr, i->end-i->curr,
					i->immediate+mach->sb, CANY);
		bprint(i, "(SB),R%d", i->rt);
	}
	else
		format(o->mnemonic, i, o->ken);
}

static void
andi(Opcode *o, Instr *i)
{
	if (i->rs == i->rt)
		format(o->mnemonic, i, "%i,R%t");
	else
		format(o->mnemonic, i, o->ken);
}

static int
plocal(Instr *i, char *m, char r, int store)
{
	int offset;
	char *reg;
	Symbol s;

	if (!findsym(i->addr, CTEXT, &s) || !findlocal(&s, FRAMENAME, &s))
		return 0;
	if (s.value > i->immediate) {
		if(!getauto(&s, s.value-i->immediate, CAUTO, &s))
			return 0;
		reg = "(SP)";
		offset = i->immediate;
	} else {
		offset = i->immediate-s.value;
		if (!getauto(&s, offset-4, CPARAM, &s))
			return 0;
		reg = "(FP)";
	}
	if (store)
		bprint(i, "%s\t%c%d,%s+%d%s", m, r, i->rt, s.name, offset, reg);
	else
		bprint(i, "%s\t%s+%d%s,%c%d", m, s.name, offset, reg, r, i->rt);
	return 1;
}

static void
lw(Opcode *o, Instr *i, char r)
{
	char *m;

	if (r == 'F') {
		if (i->size == 2)
			m = "MOVD";
		else
			m = "MOVF";
	}
	else
		m = o->mnemonic;
	if (i->rs == 29 && plocal(i, m, r, 0))
			return;

	if (i->rs == 30 && mach->sb) {
		bprint(i, "%s\t", m);
		i->curr += symoff(i->curr, i->end-i->curr, i->immediate+mach->sb, CANY);
		bprint(i, "(SB),%c%d", r, i->rt);
		return;
	}
	if (r == 'F')
		format(m, i, "%l,F%t");
	else
		format(m, i, o->ken);
}

static void
load(Opcode *o, Instr *i)
{
	lw(o, i, 'R');
}

static void
lwc1(Opcode *o, Instr *i)
{
	lw(o, i, 'F');
}

static void
sw(Opcode *o, Instr *i, char r)
{
	char *m;

	if (r == 'F') {
		if (i->size == 2)
			m = "MOVD";
		else
			m = "MOVF";
	}
	else
		m = o->mnemonic;
	if (i->rs == 29 && plocal(i, m, r, 1))
			return;

	if (i->rs == 30 && mach->sb) {
		bprint(i, "%s\t%c%d,", m, r, i->rt);
		i->curr += symoff(i->curr, i->end-i->curr, i->immediate+mach->sb, CANY);
		bprint(i, "(SB)");
		return;
	}
	if (r == 'F')
		format(m, i, "F%t,%l");
	else
		format(m, i, o->ken);
}

static void
store(Opcode *o, Instr *i)
{
	sw(o, i, 'R');
}

static void
swc1(Opcode *o, Instr *i)
{
	sw(o, i, 'F');
}

static void
sll(Opcode *o, Instr *i)
{
	if (i->w0 == 0)
		bprint(i, "NOOP");		/* unofficial nop */
	else if (i->w0 == 0xc0)			/* 0xc0: SLL $3,R0 */
		bprint(i, "EHB");
	else if (i->rd == i->rt)
		format(o->mnemonic, i, "$%a,R%d");
	else
		format(o->mnemonic, i, o->ken);
}

static void
sl32(Opcode *o, Instr *i)
{
	i->sa += 32;
	if (i->rd == i->rt)
		format(o->mnemonic, i, "$%a,R%d");
	else
		format(o->mnemonic, i, o->ken);
}

static void
sllv(Opcode *o, Instr *i)
{
	if (i->rd == i->rt)
		format(o->mnemonic, i, "R%s,R%d");
	else
		format(o->mnemonic, i, o->ken);
}

static void
jal(Opcode *o, Instr *i)
{
	if (i->rd == 31)
		format("JAL", i, "(R%s)");
	else
		format(o->mnemonic, i, o->ken);
}

static void
add(Opcode *o, Instr *i)
{
	if (i->rd == i->rs)
		format(o->mnemonic, i, "R%t,R%d");
	else if (i->rd == i->rt)
		format(o->mnemonic, i, "R%s,R%d");
	else
		format(o->mnemonic, i, o->ken);
}

static void
sub(Opcode *o, Instr *i)
{
	if (i->rd == i->rs)
		format(o->mnemonic, i, "R%t,R%d");
	else
		format(o->mnemonic, i, o->ken);
}

static void
or(Opcode *o, Instr *i)
{
	if (i->rs == 0 && i->rt == 0)
		format("MOVW", i, "$0,R%d");
	else if (i->rs == 0)
		format("MOVW", i, "R%t,R%d");
	else if (i->rt == 0)
		format("MOVW", i, "R%s,R%d");
	else
		add(o, i);
}

static void
nor(Opcode *o, Instr *i)
{
	if (i->rs == 0 && i->rt == 0 && i->rd == 0)
		format("NOP", i, 0);
	else
		add(o, i);
}

static char mipscoload[] = "r%t,%l";
static char mipsload[] = "%l,R%t";
static char mipsstore[] = "R%t,%l";
static char mipsalui[] = "%i,R%s,R%t";
static char mipsalu3op[] = "R%t,R%s,R%d";
static char mipsrtrs[] = "R%t,R%s";
static char mipscorsrt[] = "r%s,r%t";
static char mipscorsi[] = "r%s,%i";
static char mipscoxxx[] = "%w";
static char mipscofp3[] = "f%a,f%d,f%t";	/* fd,fs,ft */
static char mipsfp3[] = "F%t,F%d,F%a";
static char mipscofp2[] = "f%a,f%d";		/* fd,fs */
static char mipsfp2[] = "F%d,F%a";
static char mipscofpc[] = "f%d,f%t";		/* fs,ft */
static char mipsfpc[] = "F%t,F%d";

static Opcode opcodes[64] = {
	0,		0,	0,
	0,		0,	0,
	"JMP",		0,	"%j",
	"JAL",		0,	"%j",
	"BEQ",	   branch,	0,
	"BNE",	   branch,	0,
	"BLEZ",	   branch,	0,
	"BGTZ",	   branch,	0,
	"ADD",	     addi,	mipsalui,
	"ADDU",	     addi,	mipsalui,
	"SGT",		0,	mipsalui,
	"SGTU",		0,	mipsalui,
	"AND",	     andi,	mipsalui,
	"OR",	     andi,	mipsalui,
	"XOR",	     andi,	mipsalui,
	"MOVW",		0,	"$%u,R%t",
	"cop0",		0,	0,
	"cop1",		0,	0,
	"cop2",		0,	0,
	"cop3",		0,	0,
	"BEQL",	   branch,	0,
	"BNEL",	   branch,	0,
	"BLEZL",   branch,	0,
	"BGTZL",   branch,	0,
	"instr18",	0,	mipscoxxx,
	"instr19",	0,	mipscoxxx,
	"MOVVL",     load,	mipsload,
	"MOVVR",     load,	mipsload,
	"instr1C",	0,	mipscoxxx,
	"instr1D",	0,	mipscoxxx,
	"instr1E",	0,	mipscoxxx,
	"instr1F",	0,	mipscoxxx,
	"MOVB",	     load,	mipsload,
	"MOVH",	     load,	mipsload,
	"lwl",		0,	mipscoload,
	"MOVW",	     load,	mipsload,
	"MOVBU",     load,	mipsload,
	"MOVHU",     load,	mipsload,
	"lwr",		0,	mipscoload,
	"instr27",	0,	mipscoxxx,
	"MOVB",	    store,	mipsstore,
	"MOVH",	    store,	mipsstore,
	"swl",		0,	mipscoload,
	"MOVW",	    store,	mipsstore,
	"MOVVL",    store,	mipsstore,
	"MOVVR",    store,	mipsstore,
	"swr",		0,	mipscoload,
	"CACHE",	0,	"%C,%l",
	"ll",		0,	mipscoload,
	"MOVW",	     lwc1,	mipscoload,
	"lwc2",		0,	mipscoload,
	"lwc3",		0,	mipscoload,
	"instr34",	0,	mipscoxxx,
	"ldc1",		0,	mipscoload,
	"ldc2",		0,	mipscoload,
	"MOVV",	    load,	mipsload,
	"sc",		0,	mipscoload,
	"swc1",	     swc1,	mipscoload,
	"swc2",		0,	mipscoload,
	"swc3",		0,	mipscoload,
	"instr3C",	0,	mipscoxxx,
	"sdc1",		0,	mipscoload,
	"sdc2",		0,	mipscoload,
	"MOVV",	    store,	mipsstore,
};

static Opcode sopcodes[64] = {
	"SLL",	      sll,	"$%a,R%t,R%d",
	"special01",	0,	mipscoxxx,
	"SRL",	      sll,	"$%a,R%t,R%d",
	"SRA",	      sll,	"$%a,R%t,R%d",
	"SLL",	     sllv,	"R%s,R%t,R%d",
	"special05",	0,	mipscoxxx,
	"SRL",	     sllv,	"R%s,R%t,R%d",
	"SRA",	     sllv,	"R%s,R%t,R%d",
	"JMP",		0,	"(R%s)",
	"jal",	      jal,	"r%d,r%s",
	"special0A",	0,	mipscoxxx,
	"special0B",	0,	mipscoxxx,
	"SYSCALL",	0,	0,
	"BREAK",	0,	0,
	"special0E",	0,	mipscoxxx,
	"SYNC",		0,	0,
	"MOVW",		0,	"HI,R%d",
	"MOVW",		0,	"R%s,HI",
	"MOVW",		0,	"LO,R%d",
	"MOVW",		0,	"R%s,LO",
	"SLLV",	     sllv,	"R%s,R%t,R%d",
	"special15",	0,	mipscoxxx,
	"SRLV",	     sllv,	"R%s,R%t,R%d",
	"SRAV",	     sllv,	"R%s,R%t,R%d",
	"MUL",		0,	mipsrtrs,
	"MULU",		0,	mipsrtrs,
	"DIV",		0,	mipsrtrs,
	"DIVU",		0,	mipsrtrs,
	"special1C",	0,	mipscoxxx,
	"special1D",	0,	mipscoxxx,
	"DDIV",		0,	"R%s,R%t",
	"special1F",	0,	mipscoxxx,
	"ADD",	      add,	mipsalu3op,
	"ADDU",	      add,	mipsalu3op,
	"SUB",	      sub,	mipsalu3op,
	"SUBU",	      sub,	mipsalu3op,
	"AND",	      add,	mipsalu3op,
	"OR",	       or,	mipsalu3op,
	"XOR",	      add,	mipsalu3op,
	"NOR",	      nor,	mipsalu3op,
	"special28",	0,	mipscoxxx,
	"special29",	0,	mipscoxxx,
	"SGT",		0,	mipsalu3op,
	"SGTU",		0,	mipsalu3op,
	"special2C",	0,	mipscoxxx,
	"special2D",	0,	mipscoxxx,
	"special2E",	0,	mipscoxxx,
	"DSUBU",	0,	"R%s,R%t,R%d",
	"tge",		0,	mipscorsrt,
	"tgeu",		0,	mipscorsrt,
	"tlt",		0,	mipscorsrt,
	"tltu",		0,	mipscorsrt,
	"teq",		0,	mipscorsrt,
	"special35",	0,	mipscoxxx,
	"tne",		0,	mipscorsrt,
	"special37",	0,	mipscoxxx,
	"SLLV",	      sll,	"$%a,R%t,R%d",
	"special39",	0,	mipscoxxx,
	"SRLV",	      sll,	"$%a,R%t,R%d",
	"SRAV",	      sll,	"$%a,R%t,R%d",
	"SLLV",	     sl32,	"$%a,R%t,R%d",
	"special3D",	0,	mipscoxxx,
	"SRLV",	     sl32,	"$%a,R%t,R%d",
	"SRAV",	     sl32,	"$%a,R%t,R%d",
};

static Opcode ropcodes[32] = {
	"BLTZ",	   branch,	0,
	"BGEZ",	   branch,	0,
	"BLTZL",   branch,	0,
	"BGEZL",   branch,	0,
	"regimm04",	0,	mipscoxxx,
	"regimm05",	0,	mipscoxxx,
	"regimm06",	0,	mipscoxxx,
	"regimm07",	0,	mipscoxxx,
	"tgei",		0,	mipscorsi,
	"tgeiu",	0,	mipscorsi,
	"tlti",		0,	mipscorsi,
	"tltiu",	0,	mipscorsi,
	"teqi",		0,	mipscorsi,
	"regimm0D",	0,	mipscoxxx,
	"tnei",		0,	mipscorsi,
	"regimm0F",	0,	mipscoxxx,
	"BLTZAL",  branch,	0,
	"BGEZAL",  branch,	0,
	"BLTZALL", branch,	0,
	"BGEZALL", branch,	0,
	"regimm14",	0,	mipscoxxx,
	"regimm15",	0,	mipscoxxx,
	"regimm16",	0,	mipscoxxx,
	"regimm17",	0,	mipscoxxx,
	"regimm18",	0,	mipscoxxx,
	"regimm19",	0,	mipscoxxx,
	"regimm1A",	0,	mipscoxxx,
	"regimm1B",	0,	mipscoxxx,
	"regimm1C",	0,	mipscoxxx,
	"regimm1D",	0,	mipscoxxx,
	"regimm1E",	0,	mipscoxxx,
	"regimm1F",	0,	mipscoxxx,
};

static Opcode fopcodes[64] = {
	"ADD%f",	0,	mipsfp3,
	"SUB%f",	0,	mipsfp3,
	"MUL%f",	0,	mipsfp3,
	"DIV%f",	0,	mipsfp3,
	"sqrt.%f",	0,	mipscofp2,
	"ABS%f",	0,	mipsfp2,
	"MOV%f",	0,	mipsfp2,
	"NEG%f",	0,	mipsfp2,
	"finstr08",	0,	mipscoxxx,
	"finstr09",	0,	mipscoxxx,
	"finstr0A",	0,	mipscoxxx,
	"finstr0B",	0,	mipscoxxx,
	"round.w.%f",	0,	mipscofp2,
	"trunc.w%f",	0,	mipscofp2,
	"ceil.w%f",	0,	mipscofp2,
	"floor.w%f",	0,	mipscofp2,
	"finstr10",	0,	mipscoxxx,
	"finstr11",	0,	mipscoxxx,
	"finstr12",	0,	mipscoxxx,
	"finstr13",	0,	mipscoxxx,
	"finstr14",	0,	mipscoxxx,
	"finstr15",	0,	mipscoxxx,
	"finstr16",	0,	mipscoxxx,
	"finstr17",	0,	mipscoxxx,
	"finstr18",	0,	mipscoxxx,
	"finstr19",	0,	mipscoxxx,
	"finstr1A",	0,	mipscoxxx,
	"finstr1B",	0,	mipscoxxx,
	"finstr1C",	0,	mipscoxxx,
	"finstr1D",	0,	mipscoxxx,
	"finstr1E",	0,	mipscoxxx,
	"finstr1F",	0,	mipscoxxx,
	"cvt.s.%f",	0,	mipscofp2,
	"cvt.d.%f",	0,	mipscofp2,
	"cvt.e.%f",	0,	mipscofp2,
	"cvt.q.%f",	0,	mipscofp2,
	"cvt.w.%f",	0,	mipscofp2,
	"finstr25",	0,	mipscoxxx,
	"finstr26",	0,	mipscoxxx,
	"finstr27",	0,	mipscoxxx,
	"finstr28",	0,	mipscoxxx,
	"finstr29",	0,	mipscoxxx,
	"finstr2A",	0,	mipscoxxx,
	"finstr2B",	0,	mipscoxxx,
	"finstr2C",	0,	mipscoxxx,
	"finstr2D",	0,	mipscoxxx,
	"finstr2E",	0,	mipscoxxx,
	"finstr2F",	0,	mipscoxxx,
	"c.f.%f",	0,	mipscofpc,
	"c.un.%f",	0,	mipscofpc,
	"CMPEQ%f",	0,	mipsfpc,
	"c.ueq.%f",	0,	mipscofpc,
	"c.olt.%f",	0,	mipscofpc,
	"c.ult.%f",	0,	mipscofpc,
	"c.ole.%f",	0,	mipscofpc,
	"c.ule.%f",	0,	mipscofpc,
	"c.sf.%f",	0,	mipscofpc,
	"c.ngle.%f",	0,	mipscofpc,
	"c.seq.%f",	0,	mipscofpc,
	"c.ngl.%f",	0,	mipscofpc,
	"CMPGT%f",	0,	mipsfpc,
	"c.nge.%f",	0,	mipscofpc,
	"CMPGE%f",	0,	mipsfpc,
	"c.ngt.%f",	0,	mipscofpc,
};

static char *cop0regs[32] = {
	"INDEX", "RANDOM", "TLBPHYS", "EntryLo0",
	"CONTEXT", "PageMask", "Wired",	"Error",
	"BADVADDR", "Count", "TLBVIRT", "Compare",
	"STATUS", "CAUSE", "EPC", "PRID",
	"Config", "LLadr", "WatchLo", "WatchHi",
	"20", "21", "22", "23",
	"24", "25", "26", "CacheErr",
	"TagLo", "TagHi", "ErrorEPC", "31"
};

static char fsub[16] = {
	'F', 'D', 'e', 'q', 'W', '?', '?', '?',
	'?', '?', '?', '?', '?', '?', '?', '?'
};

static char *cacheps[] = {
	"I", "D", "SI", "SD"
};

static char *cacheop[] = {
	"IWBI", "ILT", "IST", "CDE", "HI", "HWBI", "HWB", "HSV"
};

static void
format(char *mnemonic, Instr *i, char *f)
{
	if (mnemonic)
		format(0, i, mnemonic);
	if (f == 0)
		return;
	if (mnemonic)
		if (i->curr < i->end)
			*i->curr++ = '\t';
	for ( ; *f && i->curr < i->end; f++) {
		if (*f != '%') {
			*i->curr++ = *f;
			continue;
		}
		switch (*++f) {

		case 's':
			bprint(i, "%d", i->rs);
			break;

		case 't':
			bprint(i, "%d", i->rt);
			break;

		case 'd':
			bprint(i, "%d", i->rd);
			break;

		case 'a':
			bprint(i, "%d", i->sa);
			break;

		case 'l':
			bprint(i, "%lx(R%d)",i->immediate, i->rs);
			break;

		case 'i':
			bprint(i, "$%lx", i->immediate);
			break;

		case 'u':
			i->curr += symoff(i->curr, i->end-i->curr, i->immediate, CANY);
			bprint(i, "(SB)");
			break;

		case 'j':
			i->curr += symoff(i->curr, i->end-i->curr,
				(i->target<<2)|(i->addr & 0xF0000000), CANY);
			bprint(i, "(SB)");
			break;

		case 'b':
			i->curr += symoff(i->curr, i->end-i->curr,
				(i->immediate<<2)+i->addr+4, CANY);
			break;

		case 'c':
			bprint(i, "$%lx", i->cofun);
			break;

		case 'w':
			bprint(i, "[%lux]", i->w0);
			break;

		case 'm':
			bprint(i, "M(%s)", cop0regs[i->rd]);
			break;

		case 'f':
			*i->curr++ = fsub[i->rs & 0x0F];
			break;

		case 'C':
			bprint(i, "%s%s", cacheps[i->rt & 3], cacheop[(i->rt>>2) & 7]);
			break;

		case '\0':
			*i->curr++ = '%';
			return;

		default:
			bprint(i, "%%%c", *f);
			break;
		}
	}
	*i->curr = 0;
}

static void
copz(int cop, Instr *i)
{
	char *f, *m, buf[16];

	m = buf;
	f = "%t,%d";
	switch (i->rs) {

	case 0:
		sprint(buf, "mfc%d", cop);
		break;

	case 2:
		sprint(buf, "cfc%d", cop);
		break;

	case 4:
		sprint(buf, "mtc%d", cop);
		break;

	case 6:
		sprint(buf, "ctc%d", cop);
		break;

	case 8:
		f = "%b";
		switch (i->rt) {

		case 0:
			sprint(buf, "bc%df", cop);
			break;

		case 1:
			sprint(buf, "bc%dt", cop);
			break;

		case 2:
			sprint(buf, "bc%dfl", cop);
			break;

		case 3:
			sprint(buf, "bc%dtl", cop);
			break;

		default:
			sprint(buf, "cop%d", cop);
			f = mipscoxxx;
			break;
		}
		break;

	default:
		sprint(buf, "cop%d", cop);
		if (i->rs & 0x10)
			f = "function %c";
		else
			f = mipscoxxx;
		break;
	}
	format(m, i, f);
}

static void
cop0(Instr *i)
{
	char *m = 0;

	if (i->rs < 8) {
		switch (i->rs) {

		case 0:
		case 1:
			format("MOVW", i, "%m,R%t");
			return;

		case 4:
		case 5:
			format("MOVW", i, "R%t,%m");
			return;
		}
	}
	else if (i->rs >= 0x10) {
		switch (i->cofun) {
	
		case 1:
			m = "TLBR";
			break;
	
		case 2:
			m = "TLBWI";
			break;
	
		case 6:
			m = "TLBWR";
			break;
	
		case 8:
			m = "TLBP";
			break;
	
		case 16:
			m = "RFE";
			break;
	
		case 24:
			m = "ERET";
			break;

		case 32:
			m = "WAIT";
			break;
		}
		if (m) {
			format(m, i, 0);
			return;
		}
	}
	copz(0, i);
}

static void
cop1(Instr *i)
{
	char *m = "MOVW";

	switch (i->rs) {

	case 0:
		format(m, i, "F%d,R%t");
		return;

	case 2:
		format(m, i, "FCR%d,R%t");
		return;

	case 4:
		format(m, i, "R%t,F%d");
		return;

	case 6:
		format(m, i, "R%t,FCR%d");
		return;

	case 8:
		switch (i->rt) {

		case 0:
			format("BFPF", i, "%b");
			return;

		case 1:
			format("BFPT", i, "%b");
			return;
		}
		break;
	}
	copz(1, i);
}

static int
printins(Map *map, uint64_t pc, char *buf, int n)
{
	Instr i;
	Opcode *o;
	uint8_t op;

	i.curr = buf;
	i.end = buf+n-1;
	mymap = map;
	if (mkinstr(pc, &i) < 0)
		return -1;
	switch (i.op) {

	case 0x00:					/* SPECIAL */
		o = sopcodes;
		op = i.function;
		break;

	case 0x01:					/* REGIMM */
		o = ropcodes;
		op = i.rt;
		break;

	case 0x10:					/* COP0 */
		cop0(&i);
		return i.size*4;

	case 0x11:					/* COP1 */
		if (i.rs & 0x10) {
			o = fopcodes;
			op = i.function;
			break;
		}
		cop1(&i);
		return i.size*4;

	case 0x12:					/* COP2 */
	case 0x13:					/* COP3 */
		copz(i.op-0x10, &i);
		return i.size*4;

	default:
		o = opcodes;
		op = i.op;
		break;
	}
	if (o[op].f)
		(*o[op].f)(&o[op], &i);
	else
		format(o[op].mnemonic, &i, o[op].ken);
	return i.size*4;
}

extern	int	_mipscoinst(Map *, uint64_t, char*, int);

	/* modifier 'I' toggles the default disassembler type */
static int
mipsinst(Map *map, uint64_t pc, char modifier, char *buf, int n)
{
	if ((asstype == AMIPSCO && modifier == 'i')
		|| (asstype == AMIPS && modifier == 'I'))
		return _mipscoinst(map, pc, buf, n);
	else
		return printins(map, pc, buf, n);
}

static int
mipsdas(Map *map, uint64_t pc, char *buf, int n)
{
	Instr i;

	i.curr = buf;
	i.end = buf+n;
	mymap = map;
	if (mkinstr(pc, &i) < 0)
		return -1;
	if (i.end-i.curr > 8)
		i.curr = _hexify(buf, i.w0, 7);
	if (i.size == 2 && i.end-i.curr > 9) {
		*i.curr++ = ' ';
		i.curr = _hexify(i.curr, i.w1, 7);
	}
	*i.curr = 0;
	return i.size*4;
}

static int
mipsinstlen(Map *map, uint64_t pc)
{
	Instr i;

	mymap = map;
	if (mkinstr(pc, &i) < 0)
		return -1;
	return i.size*4;
}

static int
mipsfoll(Map *map, uint64_t pc, Rgetter rget, uint64_t *foll)
{
	uint32_t w, l;
	char buf[8];
	Instr i;

	mymap = map;
	if (mkinstr(pc, &i) < 0)
		return -1;
	w = i.w0;
	if((w&0xF3600000) == 0x41000000){	/* branch on coprocessor */
    Conditional:
		foll[0] = pc+8;
		l = ((w&0xFFFF)<<2);
		if(w & 0x8000)
			l |= 0xFFFC0000;
		foll[1] = pc+4 + l;
		return 2;
	}

	l = (w&0xFC000000)>>26;
	switch(l){
	case 0:		/* SPECIAL */
		if((w&0x3E) == 0x08){	/* JR, JALR */
			sprint(buf, "R%ld", (w>>21)&0x1F);
			foll[0] = (*rget)(map, buf);
			return 1;
		}
		foll[0] = pc+i.size*4;
		return 1;
	case 0x30:	/* Load-Linked followed by NOP, STC */
		foll[0] = pc+12;
		return 1;
	case 1:		/* BCOND */
	case 4:		/* BEQ */
	case 20:	/* BEQL */
	case 5:		/* BNE */
	case 21:	/* BNEL */
	case 6:		/* BLEZ */
	case 22:	/* BLEZL */
	case 7:		/* BGTZ */
	case 23:	/* BGTZL */
		goto Conditional;
	case 2:		/* J */
	case 3:		/* JAL */
		foll[0] = (pc&0xF0000000) | ((w&0x03FFFFFF)<<2);
		return 1;
	}

	foll[0] = pc+i.size*4;
	return 1;
}