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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 /* 27 * Copyright (c) 2018, Joyent, Inc. All rights reserved. 28 * Copyright 2014 Nexenta Systems, Inc. All rights reserved. 29 * Copyright (c) 2013 by Delphix. All rights reserved. 30 */ 31 32 #include <sys/types.h> 33 #include <sys/reg.h> 34 #include <sys/privregs.h> 35 #include <sys/stack.h> 36 #include <sys/frame.h> 37 38 #include <mdb/mdb_target_impl.h> 39 #include <mdb/mdb_kreg_impl.h> 40 #include <mdb/mdb_debug.h> 41 #include <mdb/mdb_modapi.h> 42 #include <mdb/mdb_amd64util.h> 43 #include <mdb/mdb_ctf.h> 44 #include <mdb/mdb_err.h> 45 #include <mdb/mdb.h> 46 47 #include <saveargs.h> 48 49 /* 50 * This array is used by the getareg and putareg entry points, and also by our 51 * register variable discipline. 52 */ 53 54 const mdb_tgt_regdesc_t mdb_amd64_kregs[] = { 55 { "savfp", KREG_SAVFP, MDB_TGT_R_EXPORT }, 56 { "savpc", KREG_SAVPC, MDB_TGT_R_EXPORT }, 57 { "rdi", KREG_RDI, MDB_TGT_R_EXPORT }, 58 { "edi", KREG_RDI, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 59 { "di", KREG_RDI, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 60 { "dil", KREG_RDI, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 61 { "rsi", KREG_RSI, MDB_TGT_R_EXPORT }, 62 { "esi", KREG_RSI, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 63 { "si", KREG_RSI, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 64 { "sil", KREG_RSI, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 65 { "rdx", KREG_RDX, MDB_TGT_R_EXPORT }, 66 { "edx", KREG_RDX, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 67 { "dx", KREG_RDX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 68 { "dh", KREG_RDX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H }, 69 { "dl", KREG_RDX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 70 { "rcx", KREG_RCX, MDB_TGT_R_EXPORT }, 71 { "ecx", KREG_RCX, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 72 { "cx", KREG_RCX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 73 { "ch", KREG_RCX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H }, 74 { "cl", KREG_RCX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 75 { "r8", KREG_R8, MDB_TGT_R_EXPORT }, 76 { "r8d", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 77 { "r8w", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 78 { "r8l", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 79 { "r9", KREG_R9, MDB_TGT_R_EXPORT }, 80 { "r9d", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 81 { "r9w", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 82 { "r9l", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 83 { "rax", KREG_RAX, MDB_TGT_R_EXPORT }, 84 { "eax", KREG_RAX, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 85 { "ax", KREG_RAX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 86 { "ah", KREG_RAX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H }, 87 { "al", KREG_RAX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 88 { "rbx", KREG_RBX, MDB_TGT_R_EXPORT }, 89 { "ebx", KREG_RBX, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 90 { "bx", KREG_RBX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 91 { "bh", KREG_RBX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H }, 92 { "bl", KREG_RBX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 93 { "rbp", KREG_RBP, MDB_TGT_R_EXPORT }, 94 { "ebp", KREG_RBP, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 95 { "bp", KREG_RBP, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 96 { "bpl", KREG_RBP, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 97 { "r10", KREG_R10, MDB_TGT_R_EXPORT }, 98 { "r10d", KREG_R10, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 99 { "r10w", KREG_R10, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 100 { "r10l", KREG_R10, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 101 { "r11", KREG_R11, MDB_TGT_R_EXPORT }, 102 { "r11d", KREG_R11, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 103 { "r11w", KREG_R11, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 104 { "r11l", KREG_R11, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 105 { "r12", KREG_R12, MDB_TGT_R_EXPORT }, 106 { "r12d", KREG_R12, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 107 { "r12w", KREG_R12, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 108 { "r12l", KREG_R12, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 109 { "r13", KREG_R13, MDB_TGT_R_EXPORT }, 110 { "r13d", KREG_R13, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 111 { "r13w", KREG_R13, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 112 { "r13l", KREG_R13, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 113 { "r14", KREG_R14, MDB_TGT_R_EXPORT }, 114 { "r14d", KREG_R14, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 115 { "r14w", KREG_R14, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 116 { "r14l", KREG_R14, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 117 { "r15", KREG_R15, MDB_TGT_R_EXPORT }, 118 { "r15d", KREG_R15, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 119 { "r15w", KREG_R15, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 120 { "r15l", KREG_R15, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 121 { "ds", KREG_DS, MDB_TGT_R_EXPORT }, 122 { "es", KREG_ES, MDB_TGT_R_EXPORT }, 123 { "fs", KREG_FS, MDB_TGT_R_EXPORT }, 124 { "gs", KREG_GS, MDB_TGT_R_EXPORT }, 125 { "trapno", KREG_TRAPNO, MDB_TGT_R_EXPORT | MDB_TGT_R_PRIV }, 126 { "err", KREG_ERR, MDB_TGT_R_EXPORT | MDB_TGT_R_PRIV }, 127 { "rip", KREG_RIP, MDB_TGT_R_EXPORT }, 128 { "cs", KREG_CS, MDB_TGT_R_EXPORT }, 129 { "rflags", KREG_RFLAGS, MDB_TGT_R_EXPORT }, 130 { "eflags", KREG_RFLAGS, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 131 { "rsp", KREG_RSP, MDB_TGT_R_EXPORT }, 132 { "esp", KREG_RSP, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 133 { "sp", KREG_RSP, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 134 { "spl", KREG_RSP, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 135 { "ss", KREG_SS, MDB_TGT_R_EXPORT }, 136 { "gsbase", KREG_GSBASE, MDB_TGT_R_EXPORT }, 137 { "kgsbase", KREG_KGSBASE, MDB_TGT_R_EXPORT }, 138 { "cr2", KREG_CR2, MDB_TGT_R_EXPORT }, 139 { "cr3", KREG_CR3, MDB_TGT_R_EXPORT }, 140 { NULL, 0, 0 } 141 }; 142 143 void 144 mdb_amd64_printregs(const mdb_tgt_gregset_t *gregs) 145 { 146 const kreg_t *kregs = &gregs->kregs[0]; 147 kreg_t rflags = kregs[KREG_RFLAGS]; 148 149 #define GETREG2(x) ((uintptr_t)kregs[(x)]), ((uintptr_t)kregs[(x)]) 150 151 mdb_printf("%%rax = 0x%0?p %15A %%r9 = 0x%0?p %A\n", 152 GETREG2(KREG_RAX), GETREG2(KREG_R9)); 153 mdb_printf("%%rbx = 0x%0?p %15A %%r10 = 0x%0?p %A\n", 154 GETREG2(KREG_RBX), GETREG2(KREG_R10)); 155 mdb_printf("%%rcx = 0x%0?p %15A %%r11 = 0x%0?p %A\n", 156 GETREG2(KREG_RCX), GETREG2(KREG_R11)); 157 mdb_printf("%%rdx = 0x%0?p %15A %%r12 = 0x%0?p %A\n", 158 GETREG2(KREG_RDX), GETREG2(KREG_R12)); 159 mdb_printf("%%rsi = 0x%0?p %15A %%r13 = 0x%0?p %A\n", 160 GETREG2(KREG_RSI), GETREG2(KREG_R13)); 161 mdb_printf("%%rdi = 0x%0?p %15A %%r14 = 0x%0?p %A\n", 162 GETREG2(KREG_RDI), GETREG2(KREG_R14)); 163 mdb_printf("%%r8 = 0x%0?p %15A %%r15 = 0x%0?p %A\n\n", 164 GETREG2(KREG_R8), GETREG2(KREG_R15)); 165 166 mdb_printf("%%rip = 0x%0?p %A\n", GETREG2(KREG_RIP)); 167 mdb_printf("%%rbp = 0x%0?p\n", kregs[KREG_RBP]); 168 mdb_printf("%%rsp = 0x%0?p\n", kregs[KREG_RSP]); 169 170 mdb_printf("%%rflags = 0x%08x\n", rflags); 171 172 mdb_printf(" id=%u vip=%u vif=%u ac=%u vm=%u rf=%u nt=%u iopl=0x%x\n", 173 (rflags & KREG_EFLAGS_ID_MASK) >> KREG_EFLAGS_ID_SHIFT, 174 (rflags & KREG_EFLAGS_VIP_MASK) >> KREG_EFLAGS_VIP_SHIFT, 175 (rflags & KREG_EFLAGS_VIF_MASK) >> KREG_EFLAGS_VIF_SHIFT, 176 (rflags & KREG_EFLAGS_AC_MASK) >> KREG_EFLAGS_AC_SHIFT, 177 (rflags & KREG_EFLAGS_VM_MASK) >> KREG_EFLAGS_VM_SHIFT, 178 (rflags & KREG_EFLAGS_RF_MASK) >> KREG_EFLAGS_RF_SHIFT, 179 (rflags & KREG_EFLAGS_NT_MASK) >> KREG_EFLAGS_NT_SHIFT, 180 (rflags & KREG_EFLAGS_IOPL_MASK) >> KREG_EFLAGS_IOPL_SHIFT); 181 182 mdb_printf(" status=<%s,%s,%s,%s,%s,%s,%s,%s,%s>\n\n", 183 (rflags & KREG_EFLAGS_OF_MASK) ? "OF" : "of", 184 (rflags & KREG_EFLAGS_DF_MASK) ? "DF" : "df", 185 (rflags & KREG_EFLAGS_IF_MASK) ? "IF" : "if", 186 (rflags & KREG_EFLAGS_TF_MASK) ? "TF" : "tf", 187 (rflags & KREG_EFLAGS_SF_MASK) ? "SF" : "sf", 188 (rflags & KREG_EFLAGS_ZF_MASK) ? "ZF" : "zf", 189 (rflags & KREG_EFLAGS_AF_MASK) ? "AF" : "af", 190 (rflags & KREG_EFLAGS_PF_MASK) ? "PF" : "pf", 191 (rflags & KREG_EFLAGS_CF_MASK) ? "CF" : "cf"); 192 193 mdb_printf("%%cs = 0x%04x\t%%ds = 0x%04x\t" 194 "%%es = 0x%04x\t%%fs = 0x%04x\n", kregs[KREG_CS], kregs[KREG_DS], 195 kregs[KREG_ES], kregs[KREG_FS] & 0xffff); 196 mdb_printf("%%gs = 0x%04x\t%%gsbase = 0x%lx\t%%kgsbase = 0x%lx\n", 197 kregs[KREG_GS] & 0xffff, kregs[KREG_GSBASE], kregs[KREG_KGSBASE]); 198 mdb_printf("%%trapno = 0x%x\t%%err = 0x%x\t%%cr2 = 0x%lx\t" 199 "%%cr3 = 0x%lx\n", kregs[KREG_TRAPNO], kregs[KREG_ERR], 200 kregs[KREG_CR2], kregs[KREG_CR3]); 201 } 202 203 int 204 mdb_amd64_kvm_stack_iter(mdb_tgt_t *t, const mdb_tgt_gregset_t *gsp, 205 mdb_tgt_stack_f *func, void *arg) 206 { 207 mdb_tgt_gregset_t gregs; 208 kreg_t *kregs = &gregs.kregs[0]; 209 int got_pc = (gsp->kregs[KREG_RIP] != 0); 210 uint_t argc, reg_argc; 211 long fr_argv[32]; 212 int start_index; /* index to save_instr where to start comparison */ 213 int err; 214 int i; 215 216 struct fr { 217 uintptr_t fr_savfp; 218 uintptr_t fr_savpc; 219 } fr; 220 221 uintptr_t fp = gsp->kregs[KREG_RBP]; 222 uintptr_t pc = gsp->kregs[KREG_RIP]; 223 uintptr_t lastfp = 0; 224 225 ssize_t size; 226 ssize_t insnsize; 227 uint8_t ins[SAVEARGS_INSN_SEQ_LEN]; 228 229 GElf_Sym s; 230 mdb_syminfo_t sip; 231 mdb_ctf_funcinfo_t mfp; 232 int xpv_panic = 0; 233 int advance_tortoise = 1; 234 uintptr_t tortoise_fp = 0; 235 #ifndef _KMDB 236 int xp; 237 238 if ((mdb_readsym(&xp, sizeof (xp), "xpv_panicking") != -1) && (xp > 0)) 239 xpv_panic = 1; 240 #endif 241 242 bcopy(gsp, &gregs, sizeof (gregs)); 243 244 while (fp != 0) { 245 int args_style = 0; 246 247 if (mdb_tgt_vread(t, &fr, sizeof (fr), fp) != sizeof (fr)) { 248 err = EMDB_NOMAP; 249 goto badfp; 250 } 251 252 if (tortoise_fp == 0) { 253 tortoise_fp = fp; 254 } else { 255 /* 256 * Advance tortoise_fp every other frame, so we detect 257 * cycles with Floyd's tortoise/hare. 258 */ 259 if (advance_tortoise != 0) { 260 struct fr tfr; 261 262 if (mdb_tgt_vread(t, &tfr, sizeof (tfr), 263 tortoise_fp) != sizeof (tfr)) { 264 err = EMDB_NOMAP; 265 goto badfp; 266 } 267 268 tortoise_fp = tfr.fr_savfp; 269 } 270 271 if (fp == tortoise_fp) { 272 err = EMDB_STKFRAME; 273 goto badfp; 274 } 275 } 276 277 advance_tortoise = !advance_tortoise; 278 279 if ((mdb_tgt_lookup_by_addr(t, pc, MDB_TGT_SYM_FUZZY, 280 NULL, 0, &s, &sip) == 0) && 281 (mdb_ctf_func_info(&s, &sip, &mfp) == 0)) { 282 int return_type = mdb_ctf_type_kind(mfp.mtf_return); 283 mdb_ctf_id_t args_types[5]; 284 285 argc = mfp.mtf_argc; 286 287 /* 288 * If the function returns a structure or union 289 * greater than 16 bytes in size %rdi contains the 290 * address in which to store the return value rather 291 * than for an argument. 292 */ 293 if ((return_type == CTF_K_STRUCT || 294 return_type == CTF_K_UNION) && 295 mdb_ctf_type_size(mfp.mtf_return) > 16) 296 start_index = 1; 297 else 298 start_index = 0; 299 300 /* 301 * If any of the first 5 arguments are a structure 302 * less than 16 bytes in size, it will be passed 303 * spread across two argument registers, and we will 304 * not cope. 305 */ 306 if (mdb_ctf_func_args(&mfp, 5, args_types) == CTF_ERR) 307 argc = 0; 308 309 for (i = 0; i < MIN(5, argc); i++) { 310 int t = mdb_ctf_type_kind(args_types[i]); 311 312 if (((t == CTF_K_STRUCT) || 313 (t == CTF_K_UNION)) && 314 mdb_ctf_type_size(args_types[i]) <= 16) { 315 argc = 0; 316 break; 317 } 318 } 319 } else { 320 argc = 0; 321 } 322 323 /* 324 * The number of instructions to search for argument saving is 325 * limited such that only instructions prior to %pc are 326 * considered such that we never read arguments from a 327 * function where the saving code has not in fact yet 328 * executed. 329 */ 330 insnsize = MIN(MIN(s.st_size, SAVEARGS_INSN_SEQ_LEN), 331 pc - s.st_value); 332 333 if (mdb_tgt_vread(t, ins, insnsize, s.st_value) != insnsize) 334 argc = 0; 335 336 if ((argc != 0) && 337 ((args_style = saveargs_has_args(ins, insnsize, argc, 338 start_index)) != SAVEARGS_NO_ARGS)) { 339 /* Up to 6 arguments are passed via registers */ 340 reg_argc = MIN((6 - start_index), mfp.mtf_argc); 341 size = reg_argc * sizeof (long); 342 343 /* 344 * If Studio pushed a structure return address as an 345 * argument, we need to read one more argument than 346 * actually exists (the addr) to make everything line 347 * up. 348 */ 349 if (args_style == SAVEARGS_STRUCT_ARGS) 350 size += sizeof (long); 351 352 if (mdb_tgt_vread(t, fr_argv, size, (fp - size)) 353 != size) 354 return (-1); /* errno has been set for us */ 355 356 /* 357 * Arrange the arguments in the right order for 358 * printing. 359 */ 360 for (i = 0; i < (reg_argc / 2); i++) { 361 long t = fr_argv[i]; 362 363 fr_argv[i] = fr_argv[reg_argc - i - 1]; 364 fr_argv[reg_argc - i - 1] = t; 365 } 366 367 if (argc > reg_argc) { 368 size = MIN((argc - reg_argc) * sizeof (long), 369 sizeof (fr_argv) - 370 (reg_argc * sizeof (long))); 371 372 if (mdb_tgt_vread(t, &fr_argv[reg_argc], size, 373 fp + sizeof (fr)) != size) 374 return (-1); /* errno has been set */ 375 } 376 } else { 377 argc = 0; 378 } 379 380 if (got_pc && func(arg, pc, argc, fr_argv, &gregs) != 0) 381 break; 382 383 kregs[KREG_RSP] = kregs[KREG_RBP]; 384 385 lastfp = fp; 386 fp = fr.fr_savfp; 387 /* 388 * The Xen hypervisor marks a stack frame as belonging to 389 * an exception by inverting the bits of the pointer to 390 * that frame. We attempt to identify these frames by 391 * inverting the pointer and seeing if it is within 0xfff 392 * bytes of the last frame. 393 */ 394 if (xpv_panic) 395 if ((fp != 0) && (fp < lastfp) && 396 ((lastfp ^ ~fp) < 0xfff)) 397 fp = ~fp; 398 399 kregs[KREG_RBP] = fp; 400 kregs[KREG_RIP] = pc = fr.fr_savpc; 401 402 got_pc = (pc != 0); 403 } 404 405 return (0); 406 407 badfp: 408 mdb_printf("%p [%s]", fp, mdb_strerror(err)); 409 return (set_errno(err)); 410 } 411 412 /* 413 * Determine the return address for the current frame. Typically this is the 414 * fr_savpc value from the current frame, but we also perform some special 415 * handling to see if we are stopped on one of the first two instructions of 416 * a typical function prologue, in which case %rbp will not be set up yet. 417 */ 418 int 419 mdb_amd64_step_out(mdb_tgt_t *t, uintptr_t *p, kreg_t pc, kreg_t fp, kreg_t sp, 420 mdb_instr_t curinstr) 421 { 422 struct frame fr; 423 GElf_Sym s; 424 char buf[1]; 425 426 enum { 427 M_PUSHQ_RBP = 0x55, /* pushq %rbp */ 428 M_REX_W = 0x48, /* REX prefix with only W set */ 429 M_MOVL_RBP = 0x8b /* movq %rsp, %rbp with prefix */ 430 }; 431 432 if (mdb_tgt_lookup_by_addr(t, pc, MDB_TGT_SYM_FUZZY, 433 buf, 0, &s, NULL) == 0) { 434 if (pc == s.st_value && curinstr == M_PUSHQ_RBP) 435 fp = sp - 8; 436 else if (pc == s.st_value + 1 && curinstr == M_REX_W) { 437 if (mdb_tgt_vread(t, &curinstr, sizeof (curinstr), 438 pc + 1) == sizeof (curinstr) && curinstr == 439 M_MOVL_RBP) 440 fp = sp; 441 } 442 } 443 444 if (mdb_tgt_vread(t, &fr, sizeof (fr), fp) == sizeof (fr)) { 445 *p = fr.fr_savpc; 446 return (0); 447 } 448 449 return (-1); /* errno is set for us */ 450 } 451 452 /*ARGSUSED*/ 453 int 454 mdb_amd64_next(mdb_tgt_t *t, uintptr_t *p, kreg_t pc, mdb_instr_t curinstr) 455 { 456 mdb_tgt_addr_t npc; 457 mdb_tgt_addr_t callpc; 458 459 enum { 460 M_CALL_REL = 0xe8, /* call near with relative displacement */ 461 M_CALL_REG = 0xff, /* call near indirect or call far register */ 462 463 M_REX_LO = 0x40, 464 M_REX_HI = 0x4f 465 }; 466 467 /* 468 * If the opcode is a near call with relative displacement, assume the 469 * displacement is a rel32 from the next instruction. 470 */ 471 if (curinstr == M_CALL_REL) { 472 *p = pc + sizeof (mdb_instr_t) + sizeof (uint32_t); 473 return (0); 474 } 475 476 /* Skip the rex prefix, if any */ 477 callpc = pc; 478 while (curinstr >= M_REX_LO && curinstr <= M_REX_HI) { 479 if (mdb_tgt_vread(t, &curinstr, sizeof (curinstr), ++callpc) != 480 sizeof (curinstr)) 481 return (-1); /* errno is set for us */ 482 } 483 484 if (curinstr != M_CALL_REG) { 485 /* It's not a call */ 486 return (set_errno(EAGAIN)); 487 } 488 489 if ((npc = mdb_dis_nextins(mdb.m_disasm, t, MDB_TGT_AS_VIRT, pc)) == pc) 490 return (-1); /* errno is set for us */ 491 492 *p = npc; 493 return (0); 494 } 495 496 /*ARGSUSED*/ 497 int 498 mdb_amd64_kvm_frame(void *arglim, uintptr_t pc, uint_t argc, const long *argv, 499 const mdb_tgt_gregset_t *gregs) 500 { 501 argc = MIN(argc, (uintptr_t)arglim); 502 mdb_printf("%a(", pc); 503 504 if (argc != 0) { 505 mdb_printf("%lr", *argv++); 506 for (argc--; argc != 0; argc--) 507 mdb_printf(", %lr", *argv++); 508 } 509 510 mdb_printf(")\n"); 511 return (0); 512 } 513 514 int 515 mdb_amd64_kvm_framev(void *arglim, uintptr_t pc, uint_t argc, const long *argv, 516 const mdb_tgt_gregset_t *gregs) 517 { 518 /* 519 * Historically adb limited stack trace argument display to a fixed- 520 * size number of arguments since no symbolic debugging info existed. 521 * On amd64 we can detect the true number of saved arguments so only 522 * respect an arglim of zero; otherwise display the entire argv[]. 523 */ 524 if (arglim == 0) 525 argc = 0; 526 527 mdb_printf("%0?lr %a(", gregs->kregs[KREG_RBP], pc); 528 529 if (argc != 0) { 530 mdb_printf("%lr", *argv++); 531 for (argc--; argc != 0; argc--) 532 mdb_printf(", %lr", *argv++); 533 } 534 535 mdb_printf(")\n"); 536 return (0); 537 } 538