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 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26 /*
27 * Copyright 2015 Joyent, Inc.
28 */
29
30 /*
31 * User Process Target Intel 32-bit component
32 *
33 * This file provides the ISA-dependent portion of the user process target.
34 * For more details on the implementation refer to mdb_proc.c.
35 */
36
37 #include <mdb/mdb_proc.h>
38 #include <mdb/mdb_kreg.h>
39 #include <mdb/mdb_err.h>
40 #include <mdb/mdb_ia32util.h>
41 #include <mdb/mdb.h>
42
43 #include <sys/ucontext.h>
44 #include <sys/frame.h>
45 #include <libproc.h>
46 #include <sys/fp.h>
47 #include <ieeefp.h>
48
49 #include <stddef.h>
50
51 const mdb_tgt_regdesc_t pt_regdesc[] = {
52 { "gs", GS, MDB_TGT_R_EXPORT },
53 { "fs", FS, MDB_TGT_R_EXPORT },
54 { "es", ES, MDB_TGT_R_EXPORT },
55 { "ds", DS, MDB_TGT_R_EXPORT },
56 { "edi", EDI, MDB_TGT_R_EXPORT },
57 { "di", EDI, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
58 { "esi", ESI, MDB_TGT_R_EXPORT },
59 { "si", ESI, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
60 { "ebp", EBP, MDB_TGT_R_EXPORT },
61 { "bp", EBP, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
62 { "kesp", ESP, MDB_TGT_R_EXPORT },
63 { "ksp", ESP, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
64 { "ebx", EBX, MDB_TGT_R_EXPORT },
65 { "bx", EBX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
66 { "bh", EBX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H },
67 { "bl", EBX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
68 { "edx", EDX, MDB_TGT_R_EXPORT },
69 { "dx", EDX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
70 { "dh", EDX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H },
71 { "dl", EDX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
72 { "ecx", ECX, MDB_TGT_R_EXPORT },
73 { "cx", ECX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
74 { "ch", ECX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H },
75 { "cl", ECX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
76 { "eax", EAX, MDB_TGT_R_EXPORT },
77 { "ax", EAX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
78 { "ah", EAX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H },
79 { "al", EAX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
80 { "trapno", TRAPNO, MDB_TGT_R_EXPORT },
81 { "err", ERR, MDB_TGT_R_EXPORT },
82 { "eip", EIP, MDB_TGT_R_EXPORT },
83 { "cs", CS, MDB_TGT_R_EXPORT },
84 { "eflags", EFL, MDB_TGT_R_EXPORT },
85 { "esp", UESP, MDB_TGT_R_EXPORT },
86 { "sp", UESP, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
87 { "ss", SS, MDB_TGT_R_EXPORT },
88 { NULL, 0, 0 }
89 };
90
91 /*
92 * We cannot rely on pr_instr, because if we hit a breakpoint or the user has
93 * artifically modified memory, it will no longer be correct.
94 */
95 static uint8_t
96 pt_read_instr(mdb_tgt_t *t)
97 {
98 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp;
99 uint8_t ret = 0;
100
101 (void) mdb_tgt_vread(t, &ret, sizeof (ret), psp->pr_reg[EIP]);
102
103 return (ret);
104 }
105
106 /*ARGSUSED*/
107 int
108 pt_regs(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
109 {
110 mdb_tgt_t *t = mdb.m_target;
111 mdb_tgt_tid_t tid;
112 prgregset_t grs;
113 prgreg_t eflags;
114 boolean_t from_ucontext = B_FALSE;
115
116 if (mdb_getopts(argc, argv,
117 'u', MDB_OPT_SETBITS, B_TRUE, &from_ucontext, NULL) != argc) {
118 return (DCMD_USAGE);
119 }
120
121 if (from_ucontext) {
122 int off;
123 int o0, o1;
124
125 if (!(flags & DCMD_ADDRSPEC)) {
126 mdb_warn("-u requires a ucontext_t address\n");
127 return (DCMD_ERR);
128 }
129
130 o0 = mdb_ctf_offsetof_by_name("ucontext_t", "uc_mcontext");
131 o1 = mdb_ctf_offsetof_by_name("mcontext_t", "gregs");
132 if (o0 == -1 || o1 == -1) {
133 off = offsetof(ucontext_t, uc_mcontext) +
134 offsetof(mcontext_t, gregs);
135 } else {
136 off = o0 + o1;
137 }
138
139 if (mdb_vread(&grs, sizeof (grs), addr + off) != sizeof (grs)) {
140 mdb_warn("failed to read from ucontext_t %p", addr);
141 return (DCMD_ERR);
142 }
143 goto print_regs;
144 }
145
146 if (t->t_pshandle == NULL || Pstate(t->t_pshandle) == PS_UNDEAD) {
147 mdb_warn("no process active\n");
148 return (DCMD_ERR);
149 }
150
151 if (Pstate(t->t_pshandle) == PS_LOST) {
152 mdb_warn("debugger has lost control of process\n");
153 return (DCMD_ERR);
154 }
155
156 if (flags & DCMD_ADDRSPEC)
157 tid = (mdb_tgt_tid_t)addr;
158 else
159 tid = PTL_TID(t);
160
161 if (PTL_GETREGS(t, tid, grs) != 0) {
162 mdb_warn("failed to get current register set");
163 return (DCMD_ERR);
164 }
165
166 print_regs:
167 eflags = grs[EFL];
168
169 mdb_printf("%%cs = 0x%04x\t\t%%eax = 0x%0?p %A\n",
170 grs[CS], grs[EAX], grs[EAX]);
171
172 mdb_printf("%%ds = 0x%04x\t\t%%ebx = 0x%0?p %A\n",
173 grs[DS], grs[EBX], grs[EBX]);
174
175 mdb_printf("%%ss = 0x%04x\t\t%%ecx = 0x%0?p %A\n",
176 grs[SS], grs[ECX], grs[ECX]);
177
178 mdb_printf("%%es = 0x%04x\t\t%%edx = 0x%0?p %A\n",
179 grs[ES], grs[EDX], grs[EDX]);
180
181 mdb_printf("%%fs = 0x%04x\t\t%%esi = 0x%0?p %A\n",
182 grs[FS], grs[ESI], grs[ESI]);
183
184 mdb_printf("%%gs = 0x%04x\t\t%%edi = 0x%0?p %A\n\n",
185 grs[GS], grs[EDI], grs[EDI]);
186
187 mdb_printf(" %%eip = 0x%0?p %A\n", grs[EIP], grs[EIP]);
188 mdb_printf(" %%ebp = 0x%0?p\n", grs[EBP]);
189 mdb_printf("%%kesp = 0x%0?p\n\n", grs[ESP]);
190 mdb_printf("%%eflags = 0x%08x\n", eflags);
191
192 mdb_printf(" id=%u vip=%u vif=%u ac=%u vm=%u rf=%u nt=%u iopl=0x%x\n",
193 (eflags & KREG_EFLAGS_ID_MASK) >> KREG_EFLAGS_ID_SHIFT,
194 (eflags & KREG_EFLAGS_VIP_MASK) >> KREG_EFLAGS_VIP_SHIFT,
195 (eflags & KREG_EFLAGS_VIF_MASK) >> KREG_EFLAGS_VIF_SHIFT,
196 (eflags & KREG_EFLAGS_AC_MASK) >> KREG_EFLAGS_AC_SHIFT,
197 (eflags & KREG_EFLAGS_VM_MASK) >> KREG_EFLAGS_VM_SHIFT,
198 (eflags & KREG_EFLAGS_RF_MASK) >> KREG_EFLAGS_RF_SHIFT,
199 (eflags & KREG_EFLAGS_NT_MASK) >> KREG_EFLAGS_NT_SHIFT,
200 (eflags & KREG_EFLAGS_IOPL_MASK) >> KREG_EFLAGS_IOPL_SHIFT);
201
202 mdb_printf(" status=<%s,%s,%s,%s,%s,%s,%s,%s,%s>\n\n",
203 (eflags & KREG_EFLAGS_OF_MASK) ? "OF" : "of",
204 (eflags & KREG_EFLAGS_DF_MASK) ? "DF" : "df",
205 (eflags & KREG_EFLAGS_IF_MASK) ? "IF" : "if",
206 (eflags & KREG_EFLAGS_TF_MASK) ? "TF" : "tf",
207 (eflags & KREG_EFLAGS_SF_MASK) ? "SF" : "sf",
208 (eflags & KREG_EFLAGS_ZF_MASK) ? "ZF" : "zf",
209 (eflags & KREG_EFLAGS_AF_MASK) ? "AF" : "af",
210 (eflags & KREG_EFLAGS_PF_MASK) ? "PF" : "pf",
211 (eflags & KREG_EFLAGS_CF_MASK) ? "CF" : "cf");
212
213 mdb_printf(" %%esp = 0x%0?x\n", grs[UESP]);
214 mdb_printf("%%trapno = 0x%x\n", grs[TRAPNO]);
215 mdb_printf(" %%err = 0x%x\n", grs[ERR]);
216
217 return (DCMD_OK);
218 }
219
220 static const char *
221 fpcw2str(uint32_t cw, char *buf, size_t nbytes)
222 {
223 char *end = buf + nbytes;
224 char *p = buf;
225
226 buf[0] = '\0';
227
228 /*
229 * Decode all masks in the 80387 control word.
230 */
231 if (cw & FPIM)
232 p += mdb_snprintf(p, (size_t)(end - p), "|IM");
233 if (cw & FPDM)
234 p += mdb_snprintf(p, (size_t)(end - p), "|DM");
235 if (cw & FPZM)
236 p += mdb_snprintf(p, (size_t)(end - p), "|ZM");
237 if (cw & FPOM)
238 p += mdb_snprintf(p, (size_t)(end - p), "|OM");
239 if (cw & FPUM)
240 p += mdb_snprintf(p, (size_t)(end - p), "|UM");
241 if (cw & FPPM)
242 p += mdb_snprintf(p, (size_t)(end - p), "|PM");
243 if (cw & FPPC)
244 p += mdb_snprintf(p, (size_t)(end - p), "|PC");
245 if (cw & FPRC)
246 p += mdb_snprintf(p, (size_t)(end - p), "|RC");
247 if (cw & FPIC)
248 p += mdb_snprintf(p, (size_t)(end - p), "|IC");
249
250 /*
251 * Decode precision, rounding, and infinity options in control word.
252 */
253 if (cw & FPSIG24)
254 p += mdb_snprintf(p, (size_t)(end - p), "|SIG24");
255 if (cw & FPSIG53)
256 p += mdb_snprintf(p, (size_t)(end - p), "|SIG53");
257 if (cw & FPSIG64)
258 p += mdb_snprintf(p, (size_t)(end - p), "|SIG64");
259
260 if ((cw & FPRC) == (FPRD|FPRU))
261 p += mdb_snprintf(p, (size_t)(end - p), "|RTZ");
262 else if (cw & FPRD)
263 p += mdb_snprintf(p, (size_t)(end - p), "|RD");
264 else if (cw & FPRU)
265 p += mdb_snprintf(p, (size_t)(end - p), "|RU");
266 else
267 p += mdb_snprintf(p, (size_t)(end - p), "|RTN");
268
269 if (cw & FPA)
270 p += mdb_snprintf(p, (size_t)(end - p), "|A");
271 else
272 p += mdb_snprintf(p, (size_t)(end - p), "|P");
273 if (cw & WFPB17)
274 p += mdb_snprintf(p, (size_t)(end - p), "|WFPB17");
275 if (cw & WFPB24)
276 p += mdb_snprintf(p, (size_t)(end - p), "|WFPB24");
277
278 if (buf[0] == '|')
279 return (buf + 1);
280
281 return ("0");
282 }
283
284 static const char *
285 fpsw2str(uint32_t cw, char *buf, size_t nbytes)
286 {
287 char *end = buf + nbytes;
288 char *p = buf;
289
290 buf[0] = '\0';
291
292 /*
293 * Decode all masks in the 80387 status word.
294 */
295 if (cw & FPS_IE)
296 p += mdb_snprintf(p, (size_t)(end - p), "|IE");
297 if (cw & FPS_DE)
298 p += mdb_snprintf(p, (size_t)(end - p), "|DE");
299 if (cw & FPS_ZE)
300 p += mdb_snprintf(p, (size_t)(end - p), "|ZE");
301 if (cw & FPS_OE)
302 p += mdb_snprintf(p, (size_t)(end - p), "|OE");
303 if (cw & FPS_UE)
304 p += mdb_snprintf(p, (size_t)(end - p), "|UE");
305 if (cw & FPS_PE)
306 p += mdb_snprintf(p, (size_t)(end - p), "|PE");
307 if (cw & FPS_SF)
308 p += mdb_snprintf(p, (size_t)(end - p), "|SF");
309 if (cw & FPS_ES)
310 p += mdb_snprintf(p, (size_t)(end - p), "|ES");
311 if (cw & FPS_C0)
312 p += mdb_snprintf(p, (size_t)(end - p), "|C0");
313 if (cw & FPS_C1)
314 p += mdb_snprintf(p, (size_t)(end - p), "|C1");
315 if (cw & FPS_C2)
316 p += mdb_snprintf(p, (size_t)(end - p), "|C2");
317 if (cw & FPS_C3)
318 p += mdb_snprintf(p, (size_t)(end - p), "|C3");
319 if (cw & FPS_B)
320 p += mdb_snprintf(p, (size_t)(end - p), "|B");
321
322 if (buf[0] == '|')
323 return (buf + 1);
324
325 return ("0");
326 }
327
328 static const char *
329 fpmxcsr2str(uint32_t mxcsr, char *buf, size_t nbytes)
330 {
331 char *end = buf + nbytes;
332 char *p = buf;
333
334 buf[0] = '\0';
335
336 /*
337 * Decode the MXCSR word
338 */
339 if (mxcsr & SSE_IE)
340 p += mdb_snprintf(p, (size_t)(end - p), "|IE");
341 if (mxcsr & SSE_DE)
342 p += mdb_snprintf(p, (size_t)(end - p), "|DE");
343 if (mxcsr & SSE_ZE)
344 p += mdb_snprintf(p, (size_t)(end - p), "|ZE");
345 if (mxcsr & SSE_OE)
346 p += mdb_snprintf(p, (size_t)(end - p), "|OE");
347 if (mxcsr & SSE_UE)
348 p += mdb_snprintf(p, (size_t)(end - p), "|UE");
349 if (mxcsr & SSE_PE)
350 p += mdb_snprintf(p, (size_t)(end - p), "|PE");
351
352 if (mxcsr & SSE_DAZ)
353 p += mdb_snprintf(p, (size_t)(end - p), "|DAZ");
354
355 if (mxcsr & SSE_IM)
356 p += mdb_snprintf(p, (size_t)(end - p), "|IM");
357 if (mxcsr & SSE_DM)
358 p += mdb_snprintf(p, (size_t)(end - p), "|DM");
359 if (mxcsr & SSE_ZM)
360 p += mdb_snprintf(p, (size_t)(end - p), "|ZM");
361 if (mxcsr & SSE_OM)
362 p += mdb_snprintf(p, (size_t)(end - p), "|OM");
363 if (mxcsr & SSE_UM)
364 p += mdb_snprintf(p, (size_t)(end - p), "|UM");
365 if (mxcsr & SSE_PM)
366 p += mdb_snprintf(p, (size_t)(end - p), "|PM");
367
368 if ((mxcsr & SSE_RC) == (SSE_RD|SSE_RU))
369 p += mdb_snprintf(p, (size_t)(end - p), "|RTZ");
370 else if (mxcsr & SSE_RD)
371 p += mdb_snprintf(p, (size_t)(end - p), "|RD");
372 else if (mxcsr & SSE_RU)
373 p += mdb_snprintf(p, (size_t)(end - p), "|RU");
374 else
375 p += mdb_snprintf(p, (size_t)(end - p), "|RTN");
376
377 if (mxcsr & SSE_FZ)
378 p += mdb_snprintf(p, (size_t)(end - p), "|FZ");
379
380 if (buf[0] == '|')
381 return (buf + 1);
382 return ("0");
383 }
384
385 /*ARGSUSED*/
386 int
387 pt_fpregs(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
388 {
389 mdb_tgt_t *t = mdb.m_target;
390 mdb_tgt_tid_t tid;
391 uint32_t hw = FP_NO;
392 uint_t sse = 0;
393 prfpregset_t fprs;
394 struct _fpstate fps;
395 char buf[256];
396 uint_t top;
397 int i;
398
399 /*
400 * Union for overlaying _fpreg structure on to quad-precision
401 * floating-point value (long double).
402 */
403 union {
404 struct _fpreg reg;
405 long double ld;
406 } fpru;
407
408 /*
409 * Array of strings corresponding to FPU tag word values (see
410 * section 7.3.6 of the Intel Programmer's Reference Manual).
411 */
412 const char *tag_strings[] = { "valid", "zero", "special", "empty" };
413
414 if (argc != 0)
415 return (DCMD_USAGE);
416
417 if (t->t_pshandle == NULL || Pstate(t->t_pshandle) == PS_UNDEAD) {
418 mdb_warn("no process active\n");
419 return (DCMD_ERR);
420 }
421
422 if (Pstate(t->t_pshandle) == PS_LOST) {
423 mdb_warn("debugger has lost control of process\n");
424 return (DCMD_ERR);
425 }
426
427 if (flags & DCMD_ADDRSPEC)
428 tid = (mdb_tgt_tid_t)addr;
429 else
430 tid = PTL_TID(t);
431
432 if (mdb_tgt_readsym(t, MDB_TGT_AS_VIRT, &hw,
433 sizeof (hw), "libc.so", "_fp_hw") < 0 &&
434 mdb_tgt_readsym(t, MDB_TGT_AS_VIRT, &hw,
435 sizeof (hw), MDB_TGT_OBJ_EXEC, "_fp_hw") < 0)
436 mdb_warn("failed to read _fp_hw value");
437
438 if (mdb_tgt_readsym(t, MDB_TGT_AS_VIRT, &sse,
439 sizeof (sse), "libc.so", "_sse_hw") < 0 &&
440 mdb_tgt_readsym(t, MDB_TGT_AS_VIRT, &sse,
441 sizeof (sse), MDB_TGT_OBJ_EXEC, "_sse_hw") < 0)
442 mdb_warn("failed to read _sse_hw value");
443
444 mdb_printf("_fp_hw 0x%02x (", hw);
445 switch (hw) {
446 case FP_SW:
447 mdb_printf("80387 software emulator");
448 break;
449 case FP_287:
450 mdb_printf("80287 chip");
451 break;
452 case FP_387:
453 mdb_printf("80387 chip");
454 break;
455 case FP_486:
456 mdb_printf("80486 chip");
457 break;
458 default:
459 mdb_printf("no floating point support");
460 break;
461 }
462 if (sse)
463 mdb_printf(" with SSE");
464 mdb_printf(")\n");
465
466 if (!(hw & FP_HW))
467 return (DCMD_OK); /* just abort if no hardware present */
468
469 if (PTL_GETFPREGS(t, tid, &fprs) != 0) {
470 mdb_warn("failed to get floating point registers");
471 return (DCMD_ERR);
472 }
473
474 bcopy(&fprs.fp_reg_set.fpchip_state, &fps, sizeof (fps));
475
476 fps.cw &= 0xffff; /* control word is really 16 bits */
477 fps.sw &= 0xffff; /* status word is really 16 bits */
478 fps.status &= 0xffff; /* saved status word is really 16 bits */
479 fps.cssel &= 0xffff; /* %cs is really 16-bits */
480 fps.datasel &= 0xffff; /* %ds is really 16-bits too */
481
482 mdb_printf("cw 0x%04x (%s)\n", fps.cw,
483 fpcw2str(fps.cw, buf, sizeof (buf)));
484
485 top = (fps.sw & FPS_TOP) >> 11;
486 mdb_printf("sw 0x%04x (TOP=0t%u) (%s)\n", fps.sw,
487 top, fpsw2str(fps.sw, buf, sizeof (buf)));
488
489 mdb_printf("xcp sw 0x%04x (%s)\n\n", fps.status,
490 fpsw2str(fps.status, buf, sizeof (buf)));
491
492 mdb_printf("ipoff %a\n", fps.ipoff);
493 mdb_printf("cssel 0x%x\n", fps.cssel);
494 mdb_printf("dtoff %a\n", fps.dataoff);
495 mdb_printf("dtsel 0x%x\n\n", fps.datasel);
496
497 for (i = 0; i < 8; i++) {
498 /*
499 * Recall that we need to use the current TOP-of-stack value to
500 * associate the _st[] index back to a physical register number,
501 * since tag word indices are physical register numbers. Then
502 * to get the tag value, we shift over two bits for each tag
503 * index, and then grab the bottom two bits.
504 */
505 uint_t tag_index = (i + top) & 7;
506 uint_t tag_value = (fps.tag >> (tag_index * 2)) & 3;
507
508 fpru.reg = fps._st[i];
509 mdb_printf("%%st%d 0x%04x.%04x%04x%04x%04x = %lg %s\n",
510 i, fpru.reg.exponent,
511 fpru.reg.significand[3], fpru.reg.significand[2],
512 fpru.reg.significand[1], fpru.reg.significand[0],
513 fpru.ld, tag_strings[tag_value]);
514 }
515
516 if (!sse)
517 return (DCMD_OK);
518
519 mdb_printf("\nmxcsr 0x%04x (%s)\n", fps.mxcsr,
520 fpmxcsr2str(fps.mxcsr, buf, sizeof (buf)));
521 mdb_printf("xcp 0x%04x (%s)\n\n", fps.xstatus,
522 fpmxcsr2str(fps.xstatus, buf, sizeof (buf)));
523
524 for (i = 0; i < 8; i++)
525 mdb_printf("%%xmm%d 0x%08x%08x%08x%08x\n", i,
526 fps.xmm[i][3], fps.xmm[i][2],
527 fps.xmm[i][1], fps.xmm[i][0]);
528
529 return (DCMD_OK);
530 }
531
532 /*ARGSUSED*/
533 int
534 pt_getfpreg(mdb_tgt_t *t, mdb_tgt_tid_t tid, ushort_t rd_num,
535 ushort_t rd_flags, mdb_tgt_reg_t *rp)
536 {
537 return (set_errno(ENOTSUP));
538 }
539
540 /*ARGSUSED*/
541 int
542 pt_putfpreg(mdb_tgt_t *t, mdb_tgt_tid_t tid, ushort_t rd_num,
543 ushort_t rd_flags, mdb_tgt_reg_t rval)
544 {
545 return (set_errno(ENOTSUP));
546 }
547
548 /*ARGSUSED*/
549 void
550 pt_addfpregs(mdb_tgt_t *t)
551 {
552 /* not implemented */
553 }
554
555 /*ARGSUSED*/
556 int
557 pt_frameregs(void *arglim, uintptr_t pc, uint_t argc, const long *argv,
558 const mdb_tgt_gregset_t *gregs, boolean_t pc_faked)
559 {
560 return (set_errno(ENOTSUP));
561 }
562
563 /*ARGSUSED*/
564 const char *
565 pt_disasm(const GElf_Ehdr *ehp)
566 {
567 return ("ia32");
568 }
569
570 /*
571 * Determine the return address for the current frame.
572 */
573 int
574 pt_step_out(mdb_tgt_t *t, uintptr_t *p)
575 {
576 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp;
577
578 if (Pstate(t->t_pshandle) != PS_STOP)
579 return (set_errno(EMDB_TGTBUSY));
580
581 return (mdb_ia32_step_out(t, p, psp->pr_reg[EIP], psp->pr_reg[EBP],
582 psp->pr_reg[UESP], pt_read_instr(t)));
583 }
584
585 /*
586 * Return the address of the next instruction following a call, or return -1
587 * and set errno to EAGAIN if the target should just single-step.
588 */
589 int
590 pt_next(mdb_tgt_t *t, uintptr_t *p)
591 {
592 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp;
593
594 if (Pstate(t->t_pshandle) != PS_STOP)
595 return (set_errno(EMDB_TGTBUSY));
596
597 return (mdb_ia32_next(t, p, psp->pr_reg[EIP], pt_read_instr(t)));
598 }