xref: /freebsd/cddl/contrib/opensolaris/lib/libdtrace/common/dt_dis.c (revision c2c014f24c10f90d85126ac5fbd4d8524de32b1c)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 
23 /*
24  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
25  * Use is subject to license terms.
26  */
27 
28 /*
29  * Copyright (c) 2013 by Delphix. All rights reserved.
30  * Copyright (c) 2013 Joyent, Inc. All rights reserved.
31  */
32 
33 #include <strings.h>
34 #include <stdio.h>
35 
36 #include <dt_impl.h>
37 #include <dt_ident.h>
38 
39 /*ARGSUSED*/
40 static void
dt_dis_log(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)41 dt_dis_log(const dtrace_difo_t *dp, const char *name, dif_instr_t in, FILE *fp)
42 {
43 	(void) fprintf(fp, "%-4s %%r%u, %%r%u, %%r%u", name,
44 	    DIF_INSTR_R1(in), DIF_INSTR_R2(in), DIF_INSTR_RD(in));
45 }
46 
47 /*ARGSUSED*/
48 static void
dt_dis_branch(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)49 dt_dis_branch(const dtrace_difo_t *dp, const char *name,
50 	dif_instr_t in, FILE *fp)
51 {
52 	(void) fprintf(fp, "%-4s %u", name, DIF_INSTR_LABEL(in));
53 }
54 
55 /*ARGSUSED*/
56 static void
dt_dis_load(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)57 dt_dis_load(const dtrace_difo_t *dp, const char *name, dif_instr_t in, FILE *fp)
58 {
59 	(void) fprintf(fp, "%-4s [%%r%u], %%r%u", name,
60 	    DIF_INSTR_R1(in), DIF_INSTR_RD(in));
61 }
62 
63 /*ARGSUSED*/
64 static void
dt_dis_store(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)65 dt_dis_store(const dtrace_difo_t *dp, const char *name,
66 	dif_instr_t in, FILE *fp)
67 {
68 	(void) fprintf(fp, "%-4s %%r%u, [%%r%u]", name,
69 	    DIF_INSTR_R1(in), DIF_INSTR_RD(in));
70 }
71 
72 /*ARGSUSED*/
73 static void
dt_dis_str(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)74 dt_dis_str(const dtrace_difo_t *dp, const char *name, dif_instr_t in, FILE *fp)
75 {
76 	(void) fprintf(fp, "%s", name);
77 }
78 
79 /*ARGSUSED*/
80 static void
dt_dis_r1rd(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)81 dt_dis_r1rd(const dtrace_difo_t *dp, const char *name, dif_instr_t in, FILE *fp)
82 {
83 	(void) fprintf(fp, "%-4s %%r%u, %%r%u", name,
84 	    DIF_INSTR_R1(in), DIF_INSTR_RD(in));
85 }
86 
87 /*ARGSUSED*/
88 static void
dt_dis_cmp(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)89 dt_dis_cmp(const dtrace_difo_t *dp, const char *name, dif_instr_t in, FILE *fp)
90 {
91 	(void) fprintf(fp, "%-4s %%r%u, %%r%u", name,
92 	    DIF_INSTR_R1(in), DIF_INSTR_R2(in));
93 }
94 
95 /*ARGSUSED*/
96 static void
dt_dis_tst(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)97 dt_dis_tst(const dtrace_difo_t *dp, const char *name, dif_instr_t in, FILE *fp)
98 {
99 	(void) fprintf(fp, "%-4s %%r%u", name, DIF_INSTR_R1(in));
100 }
101 
102 static const char *
dt_dis_varname(const dtrace_difo_t * dp,uint_t id,uint_t scope)103 dt_dis_varname(const dtrace_difo_t *dp, uint_t id, uint_t scope)
104 {
105 	const dtrace_difv_t *dvp = dp->dtdo_vartab;
106 	uint_t i;
107 
108 	for (i = 0; i < dp->dtdo_varlen; i++, dvp++) {
109 		if (dvp->dtdv_id == id && dvp->dtdv_scope == scope) {
110 			if (dvp->dtdv_name < dp->dtdo_strlen)
111 				return (dp->dtdo_strtab + dvp->dtdv_name);
112 			break;
113 		}
114 	}
115 
116 	return (NULL);
117 }
118 
119 static uint_t
dt_dis_scope(const char * name)120 dt_dis_scope(const char *name)
121 {
122 	switch (name[2]) {
123 	case 'l': return (DIFV_SCOPE_LOCAL);
124 	case 't': return (DIFV_SCOPE_THREAD);
125 	case 'g': return (DIFV_SCOPE_GLOBAL);
126 	default: return (-1u);
127 	}
128 }
129 
130 static void
dt_dis_lda(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)131 dt_dis_lda(const dtrace_difo_t *dp, const char *name, dif_instr_t in, FILE *fp)
132 {
133 	uint_t var = DIF_INSTR_R1(in);
134 	const char *vname;
135 
136 	(void) fprintf(fp, "%-4s DT_VAR(%u), %%r%u, %%r%u", name,
137 	    var, DIF_INSTR_R2(in), DIF_INSTR_RD(in));
138 
139 	if ((vname = dt_dis_varname(dp, var, dt_dis_scope(name))) != NULL)
140 		(void) fprintf(fp, "\t\t! DT_VAR(%u) = \"%s\"", var, vname);
141 }
142 
143 static void
dt_dis_ldv(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)144 dt_dis_ldv(const dtrace_difo_t *dp, const char *name, dif_instr_t in, FILE *fp)
145 {
146 	uint_t var = DIF_INSTR_VAR(in);
147 	const char *vname;
148 
149 	(void) fprintf(fp, "%-4s DT_VAR(%u), %%r%u",
150 	    name, var, DIF_INSTR_RD(in));
151 
152 	if ((vname = dt_dis_varname(dp, var, dt_dis_scope(name))) != NULL)
153 		(void) fprintf(fp, "\t\t! DT_VAR(%u) = \"%s\"", var, vname);
154 }
155 
156 static void
dt_dis_stv(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)157 dt_dis_stv(const dtrace_difo_t *dp, const char *name, dif_instr_t in, FILE *fp)
158 {
159 	uint_t var = DIF_INSTR_VAR(in);
160 	const char *vname;
161 
162 	(void) fprintf(fp, "%-4s %%r%u, DT_VAR(%u)",
163 	    name, DIF_INSTR_RS(in), var);
164 
165 	if ((vname = dt_dis_varname(dp, var, dt_dis_scope(name))) != NULL)
166 		(void) fprintf(fp, "\t\t! DT_VAR(%u) = \"%s\"", var, vname);
167 }
168 
169 static void
dt_dis_setx(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)170 dt_dis_setx(const dtrace_difo_t *dp, const char *name, dif_instr_t in, FILE *fp)
171 {
172 	uint_t intptr = DIF_INSTR_INTEGER(in);
173 
174 	(void) fprintf(fp, "%-4s DT_INTEGER[%u], %%r%u", name,
175 	    intptr, DIF_INSTR_RD(in));
176 
177 	if (intptr < dp->dtdo_intlen) {
178 		(void) fprintf(fp, "\t\t! 0x%llx",
179 		    (u_longlong_t)dp->dtdo_inttab[intptr]);
180 	}
181 }
182 
183 static void
dt_dis_sets(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)184 dt_dis_sets(const dtrace_difo_t *dp, const char *name, dif_instr_t in, FILE *fp)
185 {
186 	uint_t strptr = DIF_INSTR_STRING(in);
187 
188 	(void) fprintf(fp, "%-4s DT_STRING[%u], %%r%u", name,
189 	    strptr, DIF_INSTR_RD(in));
190 
191 	if (strptr < dp->dtdo_strlen)
192 		(void) fprintf(fp, "\t\t! \"%s\"", dp->dtdo_strtab + strptr);
193 }
194 
195 /*ARGSUSED*/
196 static void
dt_dis_ret(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)197 dt_dis_ret(const dtrace_difo_t *dp, const char *name, dif_instr_t in, FILE *fp)
198 {
199 	(void) fprintf(fp, "%-4s %%r%u", name, DIF_INSTR_RD(in));
200 }
201 
202 /*ARGSUSED*/
203 static void
dt_dis_call(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)204 dt_dis_call(const dtrace_difo_t *dp, const char *name, dif_instr_t in, FILE *fp)
205 {
206 	uint_t subr = DIF_INSTR_SUBR(in);
207 
208 	(void) fprintf(fp, "%-4s DIF_SUBR(%u), %%r%u\t\t! %s",
209 	    name, subr, DIF_INSTR_RD(in), dtrace_subrstr(NULL, subr));
210 }
211 
212 /*ARGSUSED*/
213 static void
dt_dis_pushts(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)214 dt_dis_pushts(const dtrace_difo_t *dp,
215     const char *name, dif_instr_t in, FILE *fp)
216 {
217 	static const char *const tnames[] = { "D type", "string" };
218 	uint_t type = DIF_INSTR_TYPE(in);
219 	const char *pad;
220 
221 	if (DIF_INSTR_OP(in) == DIF_OP_PUSHTV) {
222 		(void) fprintf(fp, "%-4s DT_TYPE(%u), %%r%u",
223 		    name, type, DIF_INSTR_RS(in));
224 		pad = "\t\t";
225 	} else {
226 		(void) fprintf(fp, "%-4s DT_TYPE(%u), %%r%u, %%r%u",
227 		    name, type, DIF_INSTR_R2(in), DIF_INSTR_RS(in));
228 		pad = "\t";
229 	}
230 
231 	if (type < sizeof (tnames) / sizeof (tnames[0])) {
232 		(void) fprintf(fp, "%s! DT_TYPE(%u) = %s", pad,
233 		    type, tnames[type]);
234 	}
235 }
236 
237 static void
dt_dis_xlate(const dtrace_difo_t * dp,const char * name,dif_instr_t in,FILE * fp)238 dt_dis_xlate(const dtrace_difo_t *dp,
239     const char *name, dif_instr_t in, FILE *fp)
240 {
241 	uint_t xlr = DIF_INSTR_XLREF(in);
242 
243 	(void) fprintf(fp, "%-4s DT_XLREF[%u], %%r%u",
244 	    name, xlr, DIF_INSTR_RD(in));
245 
246 	if (xlr < dp->dtdo_xlmlen) {
247 		(void) fprintf(fp, "\t\t! DT_XLREF[%u] = %u.%s", xlr,
248 		    (uint_t)dp->dtdo_xlmtab[xlr]->dn_membexpr->dn_xlator->dx_id,
249 		    dp->dtdo_xlmtab[xlr]->dn_membname);
250 	}
251 }
252 
253 static char *
dt_dis_typestr(const dtrace_diftype_t * t,char * buf,size_t len)254 dt_dis_typestr(const dtrace_diftype_t *t, char *buf, size_t len)
255 {
256 	char kind[16], ckind[16];
257 
258 	switch (t->dtdt_kind) {
259 	case DIF_TYPE_CTF:
260 		(void) strcpy(kind, "D type");
261 		break;
262 	case DIF_TYPE_STRING:
263 		(void) strcpy(kind, "string");
264 		break;
265 	default:
266 		(void) snprintf(kind, sizeof (kind), "0x%x", t->dtdt_kind);
267 	}
268 
269 	switch (t->dtdt_ckind) {
270 	case CTF_K_UNKNOWN:
271 		(void) strcpy(ckind, "unknown");
272 		break;
273 	case CTF_K_INTEGER:
274 		(void) strcpy(ckind, "integer");
275 		break;
276 	case CTF_K_FLOAT:
277 		(void) strcpy(ckind, "float");
278 		break;
279 	case CTF_K_POINTER:
280 		(void) strcpy(ckind, "pointer");
281 		break;
282 	case CTF_K_ARRAY:
283 		(void) strcpy(ckind, "array");
284 		break;
285 	case CTF_K_FUNCTION:
286 		(void) strcpy(ckind, "function");
287 		break;
288 	case CTF_K_STRUCT:
289 		(void) strcpy(ckind, "struct");
290 		break;
291 	case CTF_K_UNION:
292 		(void) strcpy(ckind, "union");
293 		break;
294 	case CTF_K_ENUM:
295 		(void) strcpy(ckind, "enum");
296 		break;
297 	case CTF_K_FORWARD:
298 		(void) strcpy(ckind, "forward");
299 		break;
300 	case CTF_K_TYPEDEF:
301 		(void) strcpy(ckind, "typedef");
302 		break;
303 	case CTF_K_VOLATILE:
304 		(void) strcpy(ckind, "volatile");
305 		break;
306 	case CTF_K_CONST:
307 		(void) strcpy(ckind, "const");
308 		break;
309 	case CTF_K_RESTRICT:
310 		(void) strcpy(ckind, "restrict");
311 		break;
312 	default:
313 		(void) snprintf(ckind, sizeof (ckind), "0x%x", t->dtdt_ckind);
314 	}
315 
316 	if (t->dtdt_flags & (DIF_TF_BYREF | DIF_TF_BYUREF)) {
317 		(void) snprintf(buf, len, "%s (%s) by %sref (size %lu)",
318 		    kind, ckind, (t->dtdt_flags & DIF_TF_BYUREF) ? "user " : "",
319 		    (ulong_t)t->dtdt_size);
320 	} else {
321 		(void) snprintf(buf, len, "%s (%s) (size %lu)",
322 		    kind, ckind, (ulong_t)t->dtdt_size);
323 	}
324 
325 	return (buf);
326 }
327 
328 static void
dt_dis_rtab(const char * rtag,const dtrace_difo_t * dp,FILE * fp,const dof_relodesc_t * rp,uint32_t len)329 dt_dis_rtab(const char *rtag, const dtrace_difo_t *dp, FILE *fp,
330     const dof_relodesc_t *rp, uint32_t len)
331 {
332 	(void) fprintf(fp, "\n%-4s %-8s %-8s %s\n",
333 	    rtag, "OFFSET", "DATA", "NAME");
334 
335 	for (; len != 0; len--, rp++) {
336 		(void) fprintf(fp, "%-4u %-8llu %-8llu %s\n",
337 		    rp->dofr_type, (u_longlong_t)rp->dofr_offset,
338 		    (u_longlong_t)rp->dofr_data,
339 		    &dp->dtdo_strtab[rp->dofr_name]);
340 	}
341 }
342 
343 void
dt_dis(const dtrace_difo_t * dp,FILE * fp)344 dt_dis(const dtrace_difo_t *dp, FILE *fp)
345 {
346 	static const struct opent {
347 		const char *op_name;
348 		void (*op_func)(const dtrace_difo_t *, const char *,
349 		    dif_instr_t, FILE *);
350 	} optab[] = {
351 		{ "(illegal opcode)", dt_dis_str },
352 		{ "or", dt_dis_log },		/* DIF_OP_OR */
353 		{ "xor", dt_dis_log },		/* DIF_OP_XOR */
354 		{ "and", dt_dis_log },		/* DIF_OP_AND */
355 		{ "sll", dt_dis_log },		/* DIF_OP_SLL */
356 		{ "srl", dt_dis_log },		/* DIF_OP_SRL */
357 		{ "sub", dt_dis_log },		/* DIF_OP_SUB */
358 		{ "add", dt_dis_log },		/* DIF_OP_ADD */
359 		{ "mul", dt_dis_log },		/* DIF_OP_MUL */
360 		{ "sdiv", dt_dis_log },		/* DIF_OP_SDIV */
361 		{ "udiv", dt_dis_log },		/* DIF_OP_UDIV */
362 		{ "srem", dt_dis_log },		/* DIF_OP_SREM */
363 		{ "urem", dt_dis_log },		/* DIF_OP_UREM */
364 		{ "not", dt_dis_r1rd },		/* DIF_OP_NOT */
365 		{ "mov", dt_dis_r1rd },		/* DIF_OP_MOV */
366 		{ "cmp", dt_dis_cmp },		/* DIF_OP_CMP */
367 		{ "tst", dt_dis_tst },		/* DIF_OP_TST */
368 		{ "ba", dt_dis_branch },	/* DIF_OP_BA */
369 		{ "be", dt_dis_branch },	/* DIF_OP_BE */
370 		{ "bne", dt_dis_branch },	/* DIF_OP_BNE */
371 		{ "bg", dt_dis_branch },	/* DIF_OP_BG */
372 		{ "bgu", dt_dis_branch },	/* DIF_OP_BGU */
373 		{ "bge", dt_dis_branch },	/* DIF_OP_BGE */
374 		{ "bgeu", dt_dis_branch },	/* DIF_OP_BGEU */
375 		{ "bl", dt_dis_branch },	/* DIF_OP_BL */
376 		{ "blu", dt_dis_branch },	/* DIF_OP_BLU */
377 		{ "ble", dt_dis_branch },	/* DIF_OP_BLE */
378 		{ "bleu", dt_dis_branch },	/* DIF_OP_BLEU */
379 		{ "ldsb", dt_dis_load },	/* DIF_OP_LDSB */
380 		{ "ldsh", dt_dis_load },	/* DIF_OP_LDSH */
381 		{ "ldsw", dt_dis_load },	/* DIF_OP_LDSW */
382 		{ "ldub", dt_dis_load },	/* DIF_OP_LDUB */
383 		{ "lduh", dt_dis_load },	/* DIF_OP_LDUH */
384 		{ "lduw", dt_dis_load },	/* DIF_OP_LDUW */
385 		{ "ldx", dt_dis_load },		/* DIF_OP_LDX */
386 		{ "ret", dt_dis_ret },		/* DIF_OP_RET */
387 		{ "nop", dt_dis_str },		/* DIF_OP_NOP */
388 		{ "setx", dt_dis_setx },	/* DIF_OP_SETX */
389 		{ "sets", dt_dis_sets },	/* DIF_OP_SETS */
390 		{ "scmp", dt_dis_cmp },		/* DIF_OP_SCMP */
391 		{ "ldga", dt_dis_lda },		/* DIF_OP_LDGA */
392 		{ "ldgs", dt_dis_ldv },		/* DIF_OP_LDGS */
393 		{ "stgs", dt_dis_stv },		/* DIF_OP_STGS */
394 		{ "ldta", dt_dis_lda },		/* DIF_OP_LDTA */
395 		{ "ldts", dt_dis_ldv },		/* DIF_OP_LDTS */
396 		{ "stts", dt_dis_stv },		/* DIF_OP_STTS */
397 		{ "sra", dt_dis_log },		/* DIF_OP_SRA */
398 		{ "call", dt_dis_call },	/* DIF_OP_CALL */
399 		{ "pushtr", dt_dis_pushts },	/* DIF_OP_PUSHTR */
400 		{ "pushtv", dt_dis_pushts },	/* DIF_OP_PUSHTV */
401 		{ "popts", dt_dis_str },	/* DIF_OP_POPTS */
402 		{ "flushts", dt_dis_str },	/* DIF_OP_FLUSHTS */
403 		{ "ldgaa", dt_dis_ldv },	/* DIF_OP_LDGAA */
404 		{ "ldtaa", dt_dis_ldv },	/* DIF_OP_LDTAA */
405 		{ "stgaa", dt_dis_stv },	/* DIF_OP_STGAA */
406 		{ "sttaa", dt_dis_stv },	/* DIF_OP_STTAA */
407 		{ "ldls", dt_dis_ldv },		/* DIF_OP_LDLS */
408 		{ "stls", dt_dis_stv },		/* DIF_OP_STLS */
409 		{ "allocs", dt_dis_r1rd },	/* DIF_OP_ALLOCS */
410 		{ "copys", dt_dis_log },	/* DIF_OP_COPYS */
411 		{ "stb", dt_dis_store },	/* DIF_OP_STB */
412 		{ "sth", dt_dis_store },	/* DIF_OP_STH */
413 		{ "stw", dt_dis_store },	/* DIF_OP_STW */
414 		{ "stx", dt_dis_store },	/* DIF_OP_STX */
415 		{ "uldsb", dt_dis_load },	/* DIF_OP_ULDSB */
416 		{ "uldsh", dt_dis_load },	/* DIF_OP_ULDSH */
417 		{ "uldsw", dt_dis_load },	/* DIF_OP_ULDSW */
418 		{ "uldub", dt_dis_load },	/* DIF_OP_ULDUB */
419 		{ "ulduh", dt_dis_load },	/* DIF_OP_ULDUH */
420 		{ "ulduw", dt_dis_load },	/* DIF_OP_ULDUW */
421 		{ "uldx", dt_dis_load },	/* DIF_OP_ULDX */
422 		{ "rldsb", dt_dis_load },	/* DIF_OP_RLDSB */
423 		{ "rldsh", dt_dis_load },	/* DIF_OP_RLDSH */
424 		{ "rldsw", dt_dis_load },	/* DIF_OP_RLDSW */
425 		{ "rldub", dt_dis_load },	/* DIF_OP_RLDUB */
426 		{ "rlduh", dt_dis_load },	/* DIF_OP_RLDUH */
427 		{ "rlduw", dt_dis_load },	/* DIF_OP_RLDUW */
428 		{ "rldx", dt_dis_load },	/* DIF_OP_RLDX */
429 		{ "xlate", dt_dis_xlate },	/* DIF_OP_XLATE */
430 		{ "xlarg", dt_dis_xlate },	/* DIF_OP_XLARG */
431 	};
432 
433 	const struct opent *op;
434 	ulong_t i = 0;
435 	char type[DT_TYPE_NAMELEN];
436 
437 	(void) fprintf(fp, "\nDIFO %p returns %s\n", (void *)dp,
438 	    dt_dis_typestr(&dp->dtdo_rtype, type, sizeof (type)));
439 
440 	(void) fprintf(fp, "%-3s %-8s    %s\n",
441 	    "OFF", "OPCODE", "INSTRUCTION");
442 
443 	for (i = 0; i < dp->dtdo_len; i++) {
444 		dif_instr_t instr = dp->dtdo_buf[i];
445 		dif_instr_t opcode = DIF_INSTR_OP(instr);
446 
447 		if (opcode >= sizeof (optab) / sizeof (optab[0]))
448 			opcode = 0; /* force invalid opcode message */
449 
450 		op = &optab[opcode];
451 		(void) fprintf(fp, "%02lu: %08x    ", i, instr);
452 		op->op_func(dp, op->op_name, instr, fp);
453 		(void) fprintf(fp, "\n");
454 	}
455 
456 	if (dp->dtdo_varlen != 0) {
457 		(void) fprintf(fp, "\n%-16s %-4s %-3s %-3s %-4s %s\n",
458 		    "NAME", "ID", "KND", "SCP", "FLAG", "TYPE");
459 	}
460 
461 	for (i = 0; i < dp->dtdo_varlen; i++) {
462 		dtrace_difv_t *v = &dp->dtdo_vartab[i];
463 		char kind[4], scope[4], flags[16] = { 0 };
464 
465 		switch (v->dtdv_kind) {
466 		case DIFV_KIND_ARRAY:
467 			(void) strcpy(kind, "arr");
468 			break;
469 		case DIFV_KIND_SCALAR:
470 			(void) strcpy(kind, "scl");
471 			break;
472 		default:
473 			(void) snprintf(kind, sizeof (kind),
474 			    "%u", v->dtdv_kind);
475 		}
476 
477 		switch (v->dtdv_scope) {
478 		case DIFV_SCOPE_GLOBAL:
479 			(void) strcpy(scope, "glb");
480 			break;
481 		case DIFV_SCOPE_THREAD:
482 			(void) strcpy(scope, "tls");
483 			break;
484 		case DIFV_SCOPE_LOCAL:
485 			(void) strcpy(scope, "loc");
486 			break;
487 		default:
488 			(void) snprintf(scope, sizeof (scope),
489 			    "%u", v->dtdv_scope);
490 		}
491 
492 		if (v->dtdv_flags & ~(DIFV_F_REF | DIFV_F_MOD)) {
493 			(void) snprintf(flags, sizeof (flags), "/0x%x",
494 			    v->dtdv_flags & ~(DIFV_F_REF | DIFV_F_MOD));
495 		}
496 
497 		if (v->dtdv_flags & DIFV_F_REF)
498 			(void) strcat(flags, "/r");
499 		if (v->dtdv_flags & DIFV_F_MOD)
500 			(void) strcat(flags, "/w");
501 
502 		(void) fprintf(fp, "%-16s %-4u %-3s %-3s %-4s %s\n",
503 		    &dp->dtdo_strtab[v->dtdv_name],
504 		    v->dtdv_id, kind, scope, flags + 1,
505 		    dt_dis_typestr(&v->dtdv_type, type, sizeof (type)));
506 	}
507 
508 	if (dp->dtdo_xlmlen != 0) {
509 		(void) fprintf(fp, "\n%-4s %-3s %-12s %s\n",
510 		    "XLID", "ARG", "MEMBER", "TYPE");
511 	}
512 
513 	for (i = 0; i < dp->dtdo_xlmlen; i++) {
514 		dt_node_t *dnp = dp->dtdo_xlmtab[i];
515 		dt_xlator_t *dxp = dnp->dn_membexpr->dn_xlator;
516 		(void) fprintf(fp, "%-4u %-3d %-12s %s\n",
517 		    (uint_t)dxp->dx_id, dxp->dx_arg, dnp->dn_membname,
518 		    dt_node_type_name(dnp, type, sizeof (type)));
519 	}
520 
521 	if (dp->dtdo_krelen != 0)
522 		dt_dis_rtab("KREL", dp, fp, dp->dtdo_kreltab, dp->dtdo_krelen);
523 
524 	if (dp->dtdo_urelen != 0)
525 		dt_dis_rtab("UREL", dp, fp, dp->dtdo_ureltab, dp->dtdo_urelen);
526 }
527