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) 2012, Joyent, Inc. All rights reserved. 28 * Copyright 2014 Nexenta Systems, Inc. All rights reserved. 29 */ 30 31 #include <sys/types.h> 32 #include <sys/reg.h> 33 #include <sys/privregs.h> 34 #include <sys/stack.h> 35 #include <sys/frame.h> 36 37 #include <mdb/mdb_target_impl.h> 38 #include <mdb/mdb_kreg_impl.h> 39 #include <mdb/mdb_debug.h> 40 #include <mdb/mdb_modapi.h> 41 #include <mdb/mdb_amd64util.h> 42 #include <mdb/mdb_ctf.h> 43 #include <mdb/mdb_err.h> 44 #include <mdb/mdb.h> 45 46 #include <saveargs.h> 47 48 /* 49 * This array is used by the getareg and putareg entry points, and also by our 50 * register variable discipline. 51 */ 52 53 const mdb_tgt_regdesc_t mdb_amd64_kregs[] = { 54 { "savfp", KREG_SAVFP, MDB_TGT_R_EXPORT }, 55 { "savpc", KREG_SAVPC, MDB_TGT_R_EXPORT }, 56 { "rdi", KREG_RDI, MDB_TGT_R_EXPORT }, 57 { "edi", KREG_RDI, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 58 { "di", KREG_RDI, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 59 { "dil", KREG_RDI, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 60 { "rsi", KREG_RSI, MDB_TGT_R_EXPORT }, 61 { "esi", KREG_RSI, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 62 { "si", KREG_RSI, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 63 { "sil", KREG_RSI, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 64 { "rdx", KREG_RDX, MDB_TGT_R_EXPORT }, 65 { "edx", KREG_RDX, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 66 { "dx", KREG_RDX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 67 { "dh", KREG_RDX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H }, 68 { "dl", KREG_RDX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 69 { "rcx", KREG_RCX, MDB_TGT_R_EXPORT }, 70 { "ecx", KREG_RCX, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 71 { "cx", KREG_RCX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 72 { "ch", KREG_RCX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H }, 73 { "cl", KREG_RCX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 74 { "r8", KREG_R8, MDB_TGT_R_EXPORT }, 75 { "r8d", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 76 { "r8w", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 77 { "r8l", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 78 { "r9", KREG_R9, MDB_TGT_R_EXPORT }, 79 { "r9d", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 80 { "r9w", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 81 { "r9l", KREG_R8, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 82 { "rax", KREG_RAX, MDB_TGT_R_EXPORT }, 83 { "eax", KREG_RAX, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 84 { "ax", KREG_RAX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 85 { "ah", KREG_RAX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H }, 86 { "al", KREG_RAX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 87 { "rbx", KREG_RBX, MDB_TGT_R_EXPORT }, 88 { "ebx", KREG_RBX, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 89 { "bx", KREG_RBX, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 90 { "bh", KREG_RBX, MDB_TGT_R_EXPORT | MDB_TGT_R_8H }, 91 { "bl", KREG_RBX, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 92 { "rbp", KREG_RBP, MDB_TGT_R_EXPORT }, 93 { "ebp", KREG_RBP, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 94 { "bp", KREG_RBP, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 95 { "bpl", KREG_RBP, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 96 { "r10", KREG_R10, MDB_TGT_R_EXPORT }, 97 { "r10d", KREG_R10, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 98 { "r10w", KREG_R10, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 99 { "r10l", KREG_R10, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 100 { "r11", KREG_R11, MDB_TGT_R_EXPORT }, 101 { "r11d", KREG_R11, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 102 { "r11w", KREG_R11, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 103 { "r11l", KREG_R11, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 104 { "r12", KREG_R12, MDB_TGT_R_EXPORT }, 105 { "r12d", KREG_R12, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 106 { "r12w", KREG_R12, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 107 { "r12l", KREG_R12, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 108 { "r13", KREG_R13, MDB_TGT_R_EXPORT }, 109 { "r13d", KREG_R13, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 110 { "r13w", KREG_R13, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 111 { "r13l", KREG_R13, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 112 { "r14", KREG_R14, MDB_TGT_R_EXPORT }, 113 { "r14d", KREG_R14, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 114 { "r14w", KREG_R14, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 115 { "r14l", KREG_R14, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 116 { "r15", KREG_R15, MDB_TGT_R_EXPORT }, 117 { "r15d", KREG_R15, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 118 { "r15w", KREG_R15, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 119 { "r15l", KREG_R15, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 120 { "ds", KREG_DS, MDB_TGT_R_EXPORT }, 121 { "es", KREG_ES, MDB_TGT_R_EXPORT }, 122 { "fs", KREG_FS, MDB_TGT_R_EXPORT }, 123 { "gs", KREG_GS, MDB_TGT_R_EXPORT }, 124 { "trapno", KREG_TRAPNO, MDB_TGT_R_EXPORT | MDB_TGT_R_PRIV }, 125 { "err", KREG_ERR, MDB_TGT_R_EXPORT | MDB_TGT_R_PRIV }, 126 { "rip", KREG_RIP, MDB_TGT_R_EXPORT }, 127 { "cs", KREG_CS, MDB_TGT_R_EXPORT }, 128 { "rflags", KREG_RFLAGS, MDB_TGT_R_EXPORT }, 129 { "eflags", KREG_RFLAGS, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 130 { "rsp", KREG_RSP, MDB_TGT_R_EXPORT }, 131 { "esp", KREG_RSP, MDB_TGT_R_EXPORT | MDB_TGT_R_32 }, 132 { "sp", KREG_RSP, MDB_TGT_R_EXPORT | MDB_TGT_R_16 }, 133 { "spl", KREG_RSP, MDB_TGT_R_EXPORT | MDB_TGT_R_8L }, 134 { "ss", KREG_SS, MDB_TGT_R_EXPORT }, 135 { NULL, 0, 0 } 136 }; 137 138 void 139 mdb_amd64_printregs(const mdb_tgt_gregset_t *gregs) 140 { 141 const kreg_t *kregs = &gregs->kregs[0]; 142 kreg_t rflags = kregs[KREG_RFLAGS]; 143 144 #define GETREG2(x) ((uintptr_t)kregs[(x)]), ((uintptr_t)kregs[(x)]) 145 146 mdb_printf("%%rax = 0x%0?p %15A %%r9 = 0x%0?p %A\n", 147 GETREG2(KREG_RAX), GETREG2(KREG_R9)); 148 mdb_printf("%%rbx = 0x%0?p %15A %%r10 = 0x%0?p %A\n", 149 GETREG2(KREG_RBX), GETREG2(KREG_R10)); 150 mdb_printf("%%rcx = 0x%0?p %15A %%r11 = 0x%0?p %A\n", 151 GETREG2(KREG_RCX), GETREG2(KREG_R11)); 152 mdb_printf("%%rdx = 0x%0?p %15A %%r12 = 0x%0?p %A\n", 153 GETREG2(KREG_RDX), GETREG2(KREG_R12)); 154 mdb_printf("%%rsi = 0x%0?p %15A %%r13 = 0x%0?p %A\n", 155 GETREG2(KREG_RSI), GETREG2(KREG_R13)); 156 mdb_printf("%%rdi = 0x%0?p %15A %%r14 = 0x%0?p %A\n", 157 GETREG2(KREG_RDI), GETREG2(KREG_R14)); 158 mdb_printf("%%r8 = 0x%0?p %15A %%r15 = 0x%0?p %A\n\n", 159 GETREG2(KREG_R8), GETREG2(KREG_R15)); 160 161 mdb_printf("%%rip = 0x%0?p %A\n", GETREG2(KREG_RIP)); 162 mdb_printf("%%rbp = 0x%0?p\n", kregs[KREG_RBP]); 163 mdb_printf("%%rsp = 0x%0?p\n", kregs[KREG_RSP]); 164 165 mdb_printf("%%rflags = 0x%08x\n", rflags); 166 167 mdb_printf(" id=%u vip=%u vif=%u ac=%u vm=%u rf=%u nt=%u iopl=0x%x\n", 168 (rflags & KREG_EFLAGS_ID_MASK) >> KREG_EFLAGS_ID_SHIFT, 169 (rflags & KREG_EFLAGS_VIP_MASK) >> KREG_EFLAGS_VIP_SHIFT, 170 (rflags & KREG_EFLAGS_VIF_MASK) >> KREG_EFLAGS_VIF_SHIFT, 171 (rflags & KREG_EFLAGS_AC_MASK) >> KREG_EFLAGS_AC_SHIFT, 172 (rflags & KREG_EFLAGS_VM_MASK) >> KREG_EFLAGS_VM_SHIFT, 173 (rflags & KREG_EFLAGS_RF_MASK) >> KREG_EFLAGS_RF_SHIFT, 174 (rflags & KREG_EFLAGS_NT_MASK) >> KREG_EFLAGS_NT_SHIFT, 175 (rflags & KREG_EFLAGS_IOPL_MASK) >> KREG_EFLAGS_IOPL_SHIFT); 176 177 mdb_printf(" status=<%s,%s,%s,%s,%s,%s,%s,%s,%s>\n\n", 178 (rflags & KREG_EFLAGS_OF_MASK) ? "OF" : "of", 179 (rflags & KREG_EFLAGS_DF_MASK) ? "DF" : "df", 180 (rflags & KREG_EFLAGS_IF_MASK) ? "IF" : "if", 181 (rflags & KREG_EFLAGS_TF_MASK) ? "TF" : "tf", 182 (rflags & KREG_EFLAGS_SF_MASK) ? "SF" : "sf", 183 (rflags & KREG_EFLAGS_ZF_MASK) ? "ZF" : "zf", 184 (rflags & KREG_EFLAGS_AF_MASK) ? "AF" : "af", 185 (rflags & KREG_EFLAGS_PF_MASK) ? "PF" : "pf", 186 (rflags & KREG_EFLAGS_CF_MASK) ? "CF" : "cf"); 187 188 mdb_printf("%24s%%cs = 0x%04x\t%%ds = 0x%04x\t%%es = 0x%04x\n", 189 " ", kregs[KREG_CS], kregs[KREG_DS], kregs[KREG_ES]); 190 191 mdb_printf("%%trapno = 0x%x\t\t%%fs = 0x%04x\t%%gs = 0x%04x\n", 192 kregs[KREG_TRAPNO], (kregs[KREG_FS] & 0xffff), 193 (kregs[KREG_GS] & 0xffff)); 194 mdb_printf(" %%err = 0x%x\n", kregs[KREG_ERR]); 195 } 196 197 /* 198 * We expect all proper Solaris core files to have STACK_ALIGN-aligned stacks. 199 * Hence the name. However, if the core file resulted from a 200 * hypervisor-initiated panic, the hypervisor's frames may only be 64-bit 201 * aligned instead of 128. 202 */ 203 static int 204 fp_is_aligned(uintptr_t fp, int xpv_panic) 205 { 206 if (!xpv_panic && (fp & (STACK_ALIGN -1))) 207 return (0); 208 if ((fp & sizeof (uintptr_t) - 1)) 209 return (0); 210 return (1); 211 } 212 213 int 214 mdb_amd64_kvm_stack_iter(mdb_tgt_t *t, const mdb_tgt_gregset_t *gsp, 215 mdb_tgt_stack_f *func, void *arg) 216 { 217 mdb_tgt_gregset_t gregs; 218 kreg_t *kregs = &gregs.kregs[0]; 219 int got_pc = (gsp->kregs[KREG_RIP] != 0); 220 uint_t argc, reg_argc; 221 long fr_argv[32]; 222 int start_index; /* index to save_instr where to start comparison */ 223 int err; 224 int i; 225 226 struct { 227 uintptr_t fr_savfp; 228 uintptr_t fr_savpc; 229 } fr; 230 231 uintptr_t fp = gsp->kregs[KREG_RBP]; 232 uintptr_t pc = gsp->kregs[KREG_RIP]; 233 uintptr_t lastfp = 0; 234 235 ssize_t size; 236 ssize_t insnsize; 237 uint8_t ins[SAVEARGS_INSN_SEQ_LEN]; 238 239 GElf_Sym s; 240 mdb_syminfo_t sip; 241 mdb_ctf_funcinfo_t mfp; 242 int xpv_panic = 0; 243 #ifndef _KMDB 244 int xp; 245 246 if ((mdb_readsym(&xp, sizeof (xp), "xpv_panicking") != -1) && (xp > 0)) 247 xpv_panic = 1; 248 #endif 249 250 bcopy(gsp, &gregs, sizeof (gregs)); 251 252 while (fp != 0) { 253 int args_style = 0; 254 255 /* 256 * Ensure progress (increasing fp), and prevent 257 * endless loop with the same FP. 258 */ 259 if (fp <= lastfp) { 260 err = EMDB_STKFRAME; 261 goto badfp; 262 } 263 if (!fp_is_aligned(fp, xpv_panic)) { 264 err = EMDB_STKALIGN; 265 goto badfp; 266 } 267 if (mdb_tgt_vread(t, &fr, sizeof (fr), fp) != sizeof (fr)) { 268 err = EMDB_NOMAP; 269 goto badfp; 270 } 271 272 if ((mdb_tgt_lookup_by_addr(t, pc, MDB_TGT_SYM_FUZZY, 273 NULL, 0, &s, &sip) == 0) && 274 (mdb_ctf_func_info(&s, &sip, &mfp) == 0)) { 275 int return_type = mdb_ctf_type_kind(mfp.mtf_return); 276 mdb_ctf_id_t args_types[5]; 277 278 argc = mfp.mtf_argc; 279 280 /* 281 * If the function returns a structure or union 282 * greater than 16 bytes in size %rdi contains the 283 * address in which to store the return value rather 284 * than for an argument. 285 */ 286 if ((return_type == CTF_K_STRUCT || 287 return_type == CTF_K_UNION) && 288 mdb_ctf_type_size(mfp.mtf_return) > 16) 289 start_index = 1; 290 else 291 start_index = 0; 292 293 /* 294 * If any of the first 5 arguments are a structure 295 * less than 16 bytes in size, it will be passed 296 * spread across two argument registers, and we will 297 * not cope. 298 */ 299 if (mdb_ctf_func_args(&mfp, 5, args_types) == CTF_ERR) 300 argc = 0; 301 302 for (i = 0; i < MIN(5, argc); i++) { 303 int t = mdb_ctf_type_kind(args_types[i]); 304 305 if (((t == CTF_K_STRUCT) || 306 (t == CTF_K_UNION)) && 307 mdb_ctf_type_size(args_types[i]) <= 16) { 308 argc = 0; 309 break; 310 } 311 } 312 } else { 313 argc = 0; 314 } 315 316 /* 317 * The number of instructions to search for argument saving is 318 * limited such that only instructions prior to %pc are 319 * considered such that we never read arguments from a 320 * function where the saving code has not in fact yet 321 * executed. 322 */ 323 insnsize = MIN(MIN(s.st_size, SAVEARGS_INSN_SEQ_LEN), 324 pc - s.st_value); 325 326 if (mdb_tgt_vread(t, ins, insnsize, s.st_value) != insnsize) 327 argc = 0; 328 329 if ((argc != 0) && 330 ((args_style = saveargs_has_args(ins, insnsize, argc, 331 start_index)) != SAVEARGS_NO_ARGS)) { 332 /* Up to 6 arguments are passed via registers */ 333 reg_argc = MIN((6 - start_index), mfp.mtf_argc); 334 size = reg_argc * sizeof (long); 335 336 /* 337 * If Studio pushed a structure return address as an 338 * argument, we need to read one more argument than 339 * actually exists (the addr) to make everything line 340 * up. 341 */ 342 if (args_style == SAVEARGS_STRUCT_ARGS) 343 size += sizeof (long); 344 345 if (mdb_tgt_vread(t, fr_argv, size, (fp - size)) 346 != size) 347 return (-1); /* errno has been set for us */ 348 349 /* 350 * Arrange the arguments in the right order for 351 * printing. 352 */ 353 for (i = 0; i < (reg_argc / 2); i++) { 354 long t = fr_argv[i]; 355 356 fr_argv[i] = fr_argv[reg_argc - i - 1]; 357 fr_argv[reg_argc - i - 1] = t; 358 } 359 360 if (argc > reg_argc) { 361 size = MIN((argc - reg_argc) * sizeof (long), 362 sizeof (fr_argv) - 363 (reg_argc * sizeof (long))); 364 365 if (mdb_tgt_vread(t, &fr_argv[reg_argc], size, 366 fp + sizeof (fr)) != size) 367 return (-1); /* errno has been set */ 368 } 369 } else { 370 argc = 0; 371 } 372 373 if (got_pc && func(arg, pc, argc, fr_argv, &gregs) != 0) 374 break; 375 376 kregs[KREG_RSP] = kregs[KREG_RBP]; 377 378 lastfp = fp; 379 fp = fr.fr_savfp; 380 /* 381 * The Xen hypervisor marks a stack frame as belonging to 382 * an exception by inverting the bits of the pointer to 383 * that frame. We attempt to identify these frames by 384 * inverting the pointer and seeing if it is within 0xfff 385 * bytes of the last frame. 386 */ 387 if (xpv_panic) 388 if ((fp != 0) && (fp < lastfp) && 389 ((lastfp ^ ~fp) < 0xfff)) 390 fp = ~fp; 391 392 kregs[KREG_RBP] = fp; 393 kregs[KREG_RIP] = pc = fr.fr_savpc; 394 395 got_pc = (pc != 0); 396 } 397 398 return (0); 399 400 badfp: 401 mdb_printf("%p [%s]", fp, mdb_strerror(err)); 402 return (set_errno(err)); 403 } 404 405 /* 406 * Determine the return address for the current frame. Typically this is the 407 * fr_savpc value from the current frame, but we also perform some special 408 * handling to see if we are stopped on one of the first two instructions of 409 * a typical function prologue, in which case %rbp will not be set up yet. 410 */ 411 int 412 mdb_amd64_step_out(mdb_tgt_t *t, uintptr_t *p, kreg_t pc, kreg_t fp, kreg_t sp, 413 mdb_instr_t curinstr) 414 { 415 struct frame fr; 416 GElf_Sym s; 417 char buf[1]; 418 419 enum { 420 M_PUSHQ_RBP = 0x55, /* pushq %rbp */ 421 M_REX_W = 0x48, /* REX prefix with only W set */ 422 M_MOVL_RBP = 0x8b /* movq %rsp, %rbp with prefix */ 423 }; 424 425 if (mdb_tgt_lookup_by_addr(t, pc, MDB_TGT_SYM_FUZZY, 426 buf, 0, &s, NULL) == 0) { 427 if (pc == s.st_value && curinstr == M_PUSHQ_RBP) 428 fp = sp - 8; 429 else if (pc == s.st_value + 1 && curinstr == M_REX_W) { 430 if (mdb_tgt_vread(t, &curinstr, sizeof (curinstr), 431 pc + 1) == sizeof (curinstr) && curinstr == 432 M_MOVL_RBP) 433 fp = sp; 434 } 435 } 436 437 if (mdb_tgt_vread(t, &fr, sizeof (fr), fp) == sizeof (fr)) { 438 *p = fr.fr_savpc; 439 return (0); 440 } 441 442 return (-1); /* errno is set for us */ 443 } 444 445 /*ARGSUSED*/ 446 int 447 mdb_amd64_next(mdb_tgt_t *t, uintptr_t *p, kreg_t pc, mdb_instr_t curinstr) 448 { 449 mdb_tgt_addr_t npc; 450 mdb_tgt_addr_t callpc; 451 452 enum { 453 M_CALL_REL = 0xe8, /* call near with relative displacement */ 454 M_CALL_REG = 0xff, /* call near indirect or call far register */ 455 456 M_REX_LO = 0x40, 457 M_REX_HI = 0x4f 458 }; 459 460 /* 461 * If the opcode is a near call with relative displacement, assume the 462 * displacement is a rel32 from the next instruction. 463 */ 464 if (curinstr == M_CALL_REL) { 465 *p = pc + sizeof (mdb_instr_t) + sizeof (uint32_t); 466 return (0); 467 } 468 469 /* Skip the rex prefix, if any */ 470 callpc = pc; 471 while (curinstr >= M_REX_LO && curinstr <= M_REX_HI) { 472 if (mdb_tgt_vread(t, &curinstr, sizeof (curinstr), ++callpc) != 473 sizeof (curinstr)) 474 return (-1); /* errno is set for us */ 475 } 476 477 if (curinstr != M_CALL_REG) { 478 /* It's not a call */ 479 return (set_errno(EAGAIN)); 480 } 481 482 if ((npc = mdb_dis_nextins(mdb.m_disasm, t, MDB_TGT_AS_VIRT, pc)) == pc) 483 return (-1); /* errno is set for us */ 484 485 *p = npc; 486 return (0); 487 } 488 489 /*ARGSUSED*/ 490 int 491 mdb_amd64_kvm_frame(void *arglim, uintptr_t pc, uint_t argc, const long *argv, 492 const mdb_tgt_gregset_t *gregs) 493 { 494 argc = MIN(argc, (uintptr_t)arglim); 495 mdb_printf("%a(", pc); 496 497 if (argc != 0) { 498 mdb_printf("%lr", *argv++); 499 for (argc--; argc != 0; argc--) 500 mdb_printf(", %lr", *argv++); 501 } 502 503 mdb_printf(")\n"); 504 return (0); 505 } 506 507 int 508 mdb_amd64_kvm_framev(void *arglim, uintptr_t pc, uint_t argc, const long *argv, 509 const mdb_tgt_gregset_t *gregs) 510 { 511 /* 512 * Historically adb limited stack trace argument display to a fixed- 513 * size number of arguments since no symbolic debugging info existed. 514 * On amd64 we can detect the true number of saved arguments so only 515 * respect an arglim of zero; otherwise display the entire argv[]. 516 */ 517 if (arglim == 0) 518 argc = 0; 519 520 mdb_printf("%0?lr %a(", gregs->kregs[KREG_RBP], pc); 521 522 if (argc != 0) { 523 mdb_printf("%lr", *argv++); 524 for (argc--; argc != 0; argc--) 525 mdb_printf(", %lr", *argv++); 526 } 527 528 mdb_printf(")\n"); 529 return (0); 530 } 531