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5554 kmdb can't trace stacks that begin within itself
Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
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--- old/usr/src/cmd/mdb/intel/mdb/mdb_amd64util.c
+++ new/usr/src/cmd/mdb/intel/mdb/mdb_amd64util.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21
22 22 /*
23 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
24 24 * Use is subject to license terms.
25 25 */
26 26 /*
27 27 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
28 28 * Copyright 2014 Nexenta Systems, Inc. All rights reserved.
29 29 * Copyright (c) 2013 by Delphix. All rights reserved.
30 30 */
31 31
32 32 #include <sys/types.h>
33 33 #include <sys/reg.h>
34 34 #include <sys/privregs.h>
35 35 #include <sys/stack.h>
36 36 #include <sys/frame.h>
37 37
38 38 #include <mdb/mdb_target_impl.h>
39 39 #include <mdb/mdb_kreg_impl.h>
40 40 #include <mdb/mdb_debug.h>
41 41 #include <mdb/mdb_modapi.h>
42 42 #include <mdb/mdb_amd64util.h>
43 43 #include <mdb/mdb_ctf.h>
44 44 #include <mdb/mdb_err.h>
45 45 #include <mdb/mdb.h>
46 46
47 47 #include <saveargs.h>
48 48
49 49 /*
50 50 * This array is used by the getareg and putareg entry points, and also by our
51 51 * register variable discipline.
52 52 */
53 53
54 54 const mdb_tgt_regdesc_t mdb_amd64_kregs[] = {
55 55 { "savfp", KREG_SAVFP, MDB_TGT_R_EXPORT },
56 56 { "savpc", KREG_SAVPC, MDB_TGT_R_EXPORT },
57 57 { "rdi", KREG_RDI, MDB_TGT_R_EXPORT },
58 58 { "edi", KREG_RDI, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
59 59 { "di", KREG_RDI, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
60 60 { "dil", KREG_RDI, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
61 61 { "rsi", KREG_RSI, MDB_TGT_R_EXPORT },
62 62 { "esi", KREG_RSI, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
63 63 { "si", KREG_RSI, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
64 64 { "sil", KREG_RSI, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
65 65 { "rdx", KREG_RDX, MDB_TGT_R_EXPORT },
66 66 { "edx", KREG_RDX, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
67 67 { "dx", KREG_RDX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
68 68 { "dh", KREG_RDX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H },
69 69 { "dl", KREG_RDX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
70 70 { "rcx", KREG_RCX, MDB_TGT_R_EXPORT },
71 71 { "ecx", KREG_RCX, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
72 72 { "cx", KREG_RCX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
73 73 { "ch", KREG_RCX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H },
74 74 { "cl", KREG_RCX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
75 75 { "r8", KREG_R8, MDB_TGT_R_EXPORT },
76 76 { "r8d", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
77 77 { "r8w", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
78 78 { "r8l", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
79 79 { "r9", KREG_R9, MDB_TGT_R_EXPORT },
80 80 { "r9d", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
81 81 { "r9w", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
82 82 { "r9l", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
83 83 { "rax", KREG_RAX, MDB_TGT_R_EXPORT },
84 84 { "eax", KREG_RAX, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
85 85 { "ax", KREG_RAX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
86 86 { "ah", KREG_RAX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H },
87 87 { "al", KREG_RAX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
88 88 { "rbx", KREG_RBX, MDB_TGT_R_EXPORT },
89 89 { "ebx", KREG_RBX, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
90 90 { "bx", KREG_RBX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
91 91 { "bh", KREG_RBX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H },
92 92 { "bl", KREG_RBX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
93 93 { "rbp", KREG_RBP, MDB_TGT_R_EXPORT },
94 94 { "ebp", KREG_RBP, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
95 95 { "bp", KREG_RBP, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
96 96 { "bpl", KREG_RBP, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
97 97 { "r10", KREG_R10, MDB_TGT_R_EXPORT },
98 98 { "r10d", KREG_R10, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
99 99 { "r10w", KREG_R10, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
100 100 { "r10l", KREG_R10, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
101 101 { "r11", KREG_R11, MDB_TGT_R_EXPORT },
102 102 { "r11d", KREG_R11, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
103 103 { "r11w", KREG_R11, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
104 104 { "r11l", KREG_R11, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
105 105 { "r12", KREG_R12, MDB_TGT_R_EXPORT },
106 106 { "r12d", KREG_R12, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
107 107 { "r12w", KREG_R12, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
108 108 { "r12l", KREG_R12, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
109 109 { "r13", KREG_R13, MDB_TGT_R_EXPORT },
110 110 { "r13d", KREG_R13, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
111 111 { "r13w", KREG_R13, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
112 112 { "r13l", KREG_R13, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
113 113 { "r14", KREG_R14, MDB_TGT_R_EXPORT },
114 114 { "r14d", KREG_R14, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
115 115 { "r14w", KREG_R14, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
116 116 { "r14l", KREG_R14, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
117 117 { "r15", KREG_R15, MDB_TGT_R_EXPORT },
118 118 { "r15d", KREG_R15, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
119 119 { "r15w", KREG_R15, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
120 120 { "r15l", KREG_R15, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
121 121 { "ds", KREG_DS, MDB_TGT_R_EXPORT },
122 122 { "es", KREG_ES, MDB_TGT_R_EXPORT },
123 123 { "fs", KREG_FS, MDB_TGT_R_EXPORT },
124 124 { "gs", KREG_GS, MDB_TGT_R_EXPORT },
125 125 { "trapno", KREG_TRAPNO, MDB_TGT_R_EXPORT | MDB_TGT_R_PRIV },
126 126 { "err", KREG_ERR, MDB_TGT_R_EXPORT | MDB_TGT_R_PRIV },
127 127 { "rip", KREG_RIP, MDB_TGT_R_EXPORT },
128 128 { "cs", KREG_CS, MDB_TGT_R_EXPORT },
129 129 { "rflags", KREG_RFLAGS, MDB_TGT_R_EXPORT },
130 130 { "eflags", KREG_RFLAGS, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
131 131 { "rsp", KREG_RSP, MDB_TGT_R_EXPORT },
132 132 { "esp", KREG_RSP, MDB_TGT_R_EXPORT | MDB_TGT_R_32 },
133 133 { "sp", KREG_RSP, MDB_TGT_R_EXPORT | MDB_TGT_R_16 },
134 134 { "spl", KREG_RSP, MDB_TGT_R_EXPORT | MDB_TGT_R_8L },
135 135 { "ss", KREG_SS, MDB_TGT_R_EXPORT },
136 136 { NULL, 0, 0 }
137 137 };
138 138
139 139 void
140 140 mdb_amd64_printregs(const mdb_tgt_gregset_t *gregs)
141 141 {
142 142 const kreg_t *kregs = &gregs->kregs[0];
143 143 kreg_t rflags = kregs[KREG_RFLAGS];
144 144
145 145 #define GETREG2(x) ((uintptr_t)kregs[(x)]), ((uintptr_t)kregs[(x)])
146 146
147 147 mdb_printf("%%rax = 0x%0?p %15A %%r9 = 0x%0?p %A\n",
148 148 GETREG2(KREG_RAX), GETREG2(KREG_R9));
149 149 mdb_printf("%%rbx = 0x%0?p %15A %%r10 = 0x%0?p %A\n",
150 150 GETREG2(KREG_RBX), GETREG2(KREG_R10));
151 151 mdb_printf("%%rcx = 0x%0?p %15A %%r11 = 0x%0?p %A\n",
152 152 GETREG2(KREG_RCX), GETREG2(KREG_R11));
153 153 mdb_printf("%%rdx = 0x%0?p %15A %%r12 = 0x%0?p %A\n",
154 154 GETREG2(KREG_RDX), GETREG2(KREG_R12));
155 155 mdb_printf("%%rsi = 0x%0?p %15A %%r13 = 0x%0?p %A\n",
156 156 GETREG2(KREG_RSI), GETREG2(KREG_R13));
157 157 mdb_printf("%%rdi = 0x%0?p %15A %%r14 = 0x%0?p %A\n",
158 158 GETREG2(KREG_RDI), GETREG2(KREG_R14));
159 159 mdb_printf("%%r8 = 0x%0?p %15A %%r15 = 0x%0?p %A\n\n",
160 160 GETREG2(KREG_R8), GETREG2(KREG_R15));
161 161
162 162 mdb_printf("%%rip = 0x%0?p %A\n", GETREG2(KREG_RIP));
163 163 mdb_printf("%%rbp = 0x%0?p\n", kregs[KREG_RBP]);
164 164 mdb_printf("%%rsp = 0x%0?p\n", kregs[KREG_RSP]);
165 165
166 166 mdb_printf("%%rflags = 0x%08x\n", rflags);
167 167
168 168 mdb_printf(" id=%u vip=%u vif=%u ac=%u vm=%u rf=%u nt=%u iopl=0x%x\n",
169 169 (rflags & KREG_EFLAGS_ID_MASK) >> KREG_EFLAGS_ID_SHIFT,
170 170 (rflags & KREG_EFLAGS_VIP_MASK) >> KREG_EFLAGS_VIP_SHIFT,
171 171 (rflags & KREG_EFLAGS_VIF_MASK) >> KREG_EFLAGS_VIF_SHIFT,
172 172 (rflags & KREG_EFLAGS_AC_MASK) >> KREG_EFLAGS_AC_SHIFT,
173 173 (rflags & KREG_EFLAGS_VM_MASK) >> KREG_EFLAGS_VM_SHIFT,
174 174 (rflags & KREG_EFLAGS_RF_MASK) >> KREG_EFLAGS_RF_SHIFT,
175 175 (rflags & KREG_EFLAGS_NT_MASK) >> KREG_EFLAGS_NT_SHIFT,
176 176 (rflags & KREG_EFLAGS_IOPL_MASK) >> KREG_EFLAGS_IOPL_SHIFT);
177 177
178 178 mdb_printf(" status=<%s,%s,%s,%s,%s,%s,%s,%s,%s>\n\n",
179 179 (rflags & KREG_EFLAGS_OF_MASK) ? "OF" : "of",
180 180 (rflags & KREG_EFLAGS_DF_MASK) ? "DF" : "df",
181 181 (rflags & KREG_EFLAGS_IF_MASK) ? "IF" : "if",
182 182 (rflags & KREG_EFLAGS_TF_MASK) ? "TF" : "tf",
183 183 (rflags & KREG_EFLAGS_SF_MASK) ? "SF" : "sf",
184 184 (rflags & KREG_EFLAGS_ZF_MASK) ? "ZF" : "zf",
185 185 (rflags & KREG_EFLAGS_AF_MASK) ? "AF" : "af",
186 186 (rflags & KREG_EFLAGS_PF_MASK) ? "PF" : "pf",
187 187 (rflags & KREG_EFLAGS_CF_MASK) ? "CF" : "cf");
188 188
189 189 mdb_printf("%24s%%cs = 0x%04x\t%%ds = 0x%04x\t%%es = 0x%04x\n",
190 190 " ", kregs[KREG_CS], kregs[KREG_DS], kregs[KREG_ES]);
191 191
192 192 mdb_printf("%%trapno = 0x%x\t\t%%fs = 0x%04x\t%%gs = 0x%04x\n",
193 193 kregs[KREG_TRAPNO], (kregs[KREG_FS] & 0xffff),
194 194 (kregs[KREG_GS] & 0xffff));
195 195 mdb_printf(" %%err = 0x%x\n", kregs[KREG_ERR]);
196 196 }
197 197
198 198 int
199 199 mdb_amd64_kvm_stack_iter(mdb_tgt_t *t, const mdb_tgt_gregset_t *gsp,
200 200 mdb_tgt_stack_f *func, void *arg)
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200 lines elided |
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201 201 {
202 202 mdb_tgt_gregset_t gregs;
203 203 kreg_t *kregs = &gregs.kregs[0];
204 204 int got_pc = (gsp->kregs[KREG_RIP] != 0);
205 205 uint_t argc, reg_argc;
206 206 long fr_argv[32];
207 207 int start_index; /* index to save_instr where to start comparison */
208 208 int err;
209 209 int i;
210 210
211 - struct {
211 + struct fr {
212 212 uintptr_t fr_savfp;
213 213 uintptr_t fr_savpc;
214 214 } fr;
215 215
216 216 uintptr_t fp = gsp->kregs[KREG_RBP];
217 217 uintptr_t pc = gsp->kregs[KREG_RIP];
218 218 uintptr_t lastfp = 0;
219 219
220 220 ssize_t size;
221 221 ssize_t insnsize;
222 222 uint8_t ins[SAVEARGS_INSN_SEQ_LEN];
223 223
224 224 GElf_Sym s;
225 225 mdb_syminfo_t sip;
226 226 mdb_ctf_funcinfo_t mfp;
227 227 int xpv_panic = 0;
228 + int advance_tortoise = 1;
229 + uintptr_t tortoise_fp = 0;
228 230 #ifndef _KMDB
229 231 int xp;
230 232
231 233 if ((mdb_readsym(&xp, sizeof (xp), "xpv_panicking") != -1) && (xp > 0))
232 234 xpv_panic = 1;
233 235 #endif
234 236
235 237 bcopy(gsp, &gregs, sizeof (gregs));
236 238
237 239 while (fp != 0) {
238 240 int args_style = 0;
239 241
240 - /*
241 - * Ensure progress (increasing fp), and prevent
242 - * endless loop with the same FP.
243 - */
244 - if (fp <= lastfp) {
245 - err = EMDB_STKFRAME;
246 - goto badfp;
247 - }
248 242 if (mdb_tgt_vread(t, &fr, sizeof (fr), fp) != sizeof (fr)) {
249 243 err = EMDB_NOMAP;
250 244 goto badfp;
251 245 }
252 246
247 + if (tortoise_fp == 0) {
248 + tortoise_fp = fp;
249 + } else {
250 + if (advance_tortoise != 0) {
251 + struct fr tfr;
252 +
253 + if (mdb_tgt_vread(t, &tfr, sizeof (tfr),
254 + tortoise_fp) != sizeof (tfr)) {
255 + err = EMDB_NOMAP;
256 + goto badfp;
257 + }
258 +
259 + tortoise_fp = tfr.fr_savfp;
260 + }
261 +
262 + if (fp == tortoise_fp) {
263 + err = EMDB_STKFRAME;
264 + goto badfp;
265 + }
266 + }
267 +
268 + advance_tortoise = !advance_tortoise;
269 +
253 270 if ((mdb_tgt_lookup_by_addr(t, pc, MDB_TGT_SYM_FUZZY,
254 271 NULL, 0, &s, &sip) == 0) &&
255 272 (mdb_ctf_func_info(&s, &sip, &mfp) == 0)) {
256 273 int return_type = mdb_ctf_type_kind(mfp.mtf_return);
257 274 mdb_ctf_id_t args_types[5];
258 275
259 276 argc = mfp.mtf_argc;
260 277
261 278 /*
262 279 * If the function returns a structure or union
263 280 * greater than 16 bytes in size %rdi contains the
264 281 * address in which to store the return value rather
265 282 * than for an argument.
266 283 */
267 284 if ((return_type == CTF_K_STRUCT ||
268 285 return_type == CTF_K_UNION) &&
269 286 mdb_ctf_type_size(mfp.mtf_return) > 16)
270 287 start_index = 1;
271 288 else
272 289 start_index = 0;
273 290
274 291 /*
275 292 * If any of the first 5 arguments are a structure
276 293 * less than 16 bytes in size, it will be passed
277 294 * spread across two argument registers, and we will
278 295 * not cope.
279 296 */
280 297 if (mdb_ctf_func_args(&mfp, 5, args_types) == CTF_ERR)
281 298 argc = 0;
282 299
283 300 for (i = 0; i < MIN(5, argc); i++) {
284 301 int t = mdb_ctf_type_kind(args_types[i]);
285 302
286 303 if (((t == CTF_K_STRUCT) ||
287 304 (t == CTF_K_UNION)) &&
288 305 mdb_ctf_type_size(args_types[i]) <= 16) {
289 306 argc = 0;
290 307 break;
291 308 }
292 309 }
293 310 } else {
294 311 argc = 0;
295 312 }
296 313
297 314 /*
298 315 * The number of instructions to search for argument saving is
299 316 * limited such that only instructions prior to %pc are
300 317 * considered such that we never read arguments from a
301 318 * function where the saving code has not in fact yet
302 319 * executed.
303 320 */
304 321 insnsize = MIN(MIN(s.st_size, SAVEARGS_INSN_SEQ_LEN),
305 322 pc - s.st_value);
306 323
307 324 if (mdb_tgt_vread(t, ins, insnsize, s.st_value) != insnsize)
308 325 argc = 0;
309 326
310 327 if ((argc != 0) &&
311 328 ((args_style = saveargs_has_args(ins, insnsize, argc,
312 329 start_index)) != SAVEARGS_NO_ARGS)) {
313 330 /* Up to 6 arguments are passed via registers */
314 331 reg_argc = MIN((6 - start_index), mfp.mtf_argc);
315 332 size = reg_argc * sizeof (long);
316 333
317 334 /*
318 335 * If Studio pushed a structure return address as an
319 336 * argument, we need to read one more argument than
320 337 * actually exists (the addr) to make everything line
321 338 * up.
322 339 */
323 340 if (args_style == SAVEARGS_STRUCT_ARGS)
324 341 size += sizeof (long);
325 342
326 343 if (mdb_tgt_vread(t, fr_argv, size, (fp - size))
327 344 != size)
328 345 return (-1); /* errno has been set for us */
329 346
330 347 /*
331 348 * Arrange the arguments in the right order for
332 349 * printing.
333 350 */
334 351 for (i = 0; i < (reg_argc / 2); i++) {
335 352 long t = fr_argv[i];
336 353
337 354 fr_argv[i] = fr_argv[reg_argc - i - 1];
338 355 fr_argv[reg_argc - i - 1] = t;
339 356 }
340 357
341 358 if (argc > reg_argc) {
342 359 size = MIN((argc - reg_argc) * sizeof (long),
343 360 sizeof (fr_argv) -
344 361 (reg_argc * sizeof (long)));
345 362
346 363 if (mdb_tgt_vread(t, &fr_argv[reg_argc], size,
347 364 fp + sizeof (fr)) != size)
348 365 return (-1); /* errno has been set */
349 366 }
350 367 } else {
351 368 argc = 0;
352 369 }
353 370
354 371 if (got_pc && func(arg, pc, argc, fr_argv, &gregs) != 0)
355 372 break;
356 373
357 374 kregs[KREG_RSP] = kregs[KREG_RBP];
358 375
359 376 lastfp = fp;
360 377 fp = fr.fr_savfp;
361 378 /*
362 379 * The Xen hypervisor marks a stack frame as belonging to
363 380 * an exception by inverting the bits of the pointer to
364 381 * that frame. We attempt to identify these frames by
365 382 * inverting the pointer and seeing if it is within 0xfff
366 383 * bytes of the last frame.
367 384 */
368 385 if (xpv_panic)
369 386 if ((fp != 0) && (fp < lastfp) &&
370 387 ((lastfp ^ ~fp) < 0xfff))
371 388 fp = ~fp;
372 389
373 390 kregs[KREG_RBP] = fp;
374 391 kregs[KREG_RIP] = pc = fr.fr_savpc;
375 392
376 393 got_pc = (pc != 0);
377 394 }
378 395
379 396 return (0);
380 397
381 398 badfp:
382 399 mdb_printf("%p [%s]", fp, mdb_strerror(err));
383 400 return (set_errno(err));
384 401 }
385 402
386 403 /*
387 404 * Determine the return address for the current frame. Typically this is the
388 405 * fr_savpc value from the current frame, but we also perform some special
389 406 * handling to see if we are stopped on one of the first two instructions of
390 407 * a typical function prologue, in which case %rbp will not be set up yet.
391 408 */
392 409 int
393 410 mdb_amd64_step_out(mdb_tgt_t *t, uintptr_t *p, kreg_t pc, kreg_t fp, kreg_t sp,
394 411 mdb_instr_t curinstr)
395 412 {
396 413 struct frame fr;
397 414 GElf_Sym s;
398 415 char buf[1];
399 416
400 417 enum {
401 418 M_PUSHQ_RBP = 0x55, /* pushq %rbp */
402 419 M_REX_W = 0x48, /* REX prefix with only W set */
403 420 M_MOVL_RBP = 0x8b /* movq %rsp, %rbp with prefix */
404 421 };
405 422
406 423 if (mdb_tgt_lookup_by_addr(t, pc, MDB_TGT_SYM_FUZZY,
407 424 buf, 0, &s, NULL) == 0) {
408 425 if (pc == s.st_value && curinstr == M_PUSHQ_RBP)
409 426 fp = sp - 8;
410 427 else if (pc == s.st_value + 1 && curinstr == M_REX_W) {
411 428 if (mdb_tgt_vread(t, &curinstr, sizeof (curinstr),
412 429 pc + 1) == sizeof (curinstr) && curinstr ==
413 430 M_MOVL_RBP)
414 431 fp = sp;
415 432 }
416 433 }
417 434
418 435 if (mdb_tgt_vread(t, &fr, sizeof (fr), fp) == sizeof (fr)) {
419 436 *p = fr.fr_savpc;
420 437 return (0);
421 438 }
422 439
423 440 return (-1); /* errno is set for us */
424 441 }
425 442
426 443 /*ARGSUSED*/
427 444 int
428 445 mdb_amd64_next(mdb_tgt_t *t, uintptr_t *p, kreg_t pc, mdb_instr_t curinstr)
429 446 {
430 447 mdb_tgt_addr_t npc;
431 448 mdb_tgt_addr_t callpc;
432 449
433 450 enum {
434 451 M_CALL_REL = 0xe8, /* call near with relative displacement */
435 452 M_CALL_REG = 0xff, /* call near indirect or call far register */
436 453
437 454 M_REX_LO = 0x40,
438 455 M_REX_HI = 0x4f
439 456 };
440 457
441 458 /*
442 459 * If the opcode is a near call with relative displacement, assume the
443 460 * displacement is a rel32 from the next instruction.
444 461 */
445 462 if (curinstr == M_CALL_REL) {
446 463 *p = pc + sizeof (mdb_instr_t) + sizeof (uint32_t);
447 464 return (0);
448 465 }
449 466
450 467 /* Skip the rex prefix, if any */
451 468 callpc = pc;
452 469 while (curinstr >= M_REX_LO && curinstr <= M_REX_HI) {
453 470 if (mdb_tgt_vread(t, &curinstr, sizeof (curinstr), ++callpc) !=
454 471 sizeof (curinstr))
455 472 return (-1); /* errno is set for us */
456 473 }
457 474
458 475 if (curinstr != M_CALL_REG) {
459 476 /* It's not a call */
460 477 return (set_errno(EAGAIN));
461 478 }
462 479
463 480 if ((npc = mdb_dis_nextins(mdb.m_disasm, t, MDB_TGT_AS_VIRT, pc)) == pc)
464 481 return (-1); /* errno is set for us */
465 482
466 483 *p = npc;
467 484 return (0);
468 485 }
469 486
470 487 /*ARGSUSED*/
471 488 int
472 489 mdb_amd64_kvm_frame(void *arglim, uintptr_t pc, uint_t argc, const long *argv,
473 490 const mdb_tgt_gregset_t *gregs)
474 491 {
475 492 argc = MIN(argc, (uintptr_t)arglim);
476 493 mdb_printf("%a(", pc);
477 494
478 495 if (argc != 0) {
479 496 mdb_printf("%lr", *argv++);
480 497 for (argc--; argc != 0; argc--)
481 498 mdb_printf(", %lr", *argv++);
482 499 }
483 500
484 501 mdb_printf(")\n");
485 502 return (0);
486 503 }
487 504
488 505 int
489 506 mdb_amd64_kvm_framev(void *arglim, uintptr_t pc, uint_t argc, const long *argv,
490 507 const mdb_tgt_gregset_t *gregs)
491 508 {
492 509 /*
493 510 * Historically adb limited stack trace argument display to a fixed-
494 511 * size number of arguments since no symbolic debugging info existed.
495 512 * On amd64 we can detect the true number of saved arguments so only
496 513 * respect an arglim of zero; otherwise display the entire argv[].
497 514 */
498 515 if (arglim == 0)
499 516 argc = 0;
500 517
501 518 mdb_printf("%0?lr %a(", gregs->kregs[KREG_RBP], pc);
502 519
503 520 if (argc != 0) {
504 521 mdb_printf("%lr", *argv++);
505 522 for (argc--; argc != 0; argc--)
506 523 mdb_printf(", %lr", *argv++);
507 524 }
508 525
509 526 mdb_printf(")\n");
510 527 return (0);
511 528 }
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