Mercurial > illumos > onarm
annotate usr/src/cmd/mdb/intel/mdb/mdb_ia32util.c @ 4:1a15d5aaf794
synchronized with onnv_86 (6202) in onnv-gate
| author | Koji Uno <koji.uno@sun.com> |
|---|---|
| date | Mon, 31 Aug 2009 14:38:03 +0900 |
| parents | c9caec207d52 |
| children |
| rev | line source |
|---|---|
| 0 | 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 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. | |
| 23 * Use is subject to license terms. | |
| 24 */ | |
| 25 | |
|
4
1a15d5aaf794
synchronized with onnv_86 (6202) in onnv-gate
Koji Uno <koji.uno@sun.com>
parents:
0
diff
changeset
|
26 #pragma ident "%Z%%M% %I% %E% SMI" |
| 0 | 27 |
| 28 #include <sys/types.h> | |
| 29 #include <sys/reg.h> | |
| 30 #include <sys/privregs.h> | |
| 31 #include <sys/stack.h> | |
| 32 #include <sys/frame.h> | |
| 33 | |
| 34 #include <mdb/mdb_ia32util.h> | |
| 35 #include <mdb/mdb_target_impl.h> | |
| 36 #include <mdb/mdb_kreg_impl.h> | |
| 37 #include <mdb/mdb_debug.h> | |
| 38 #include <mdb/mdb_modapi.h> | |
| 39 #include <mdb/mdb_err.h> | |
| 40 #include <mdb/mdb.h> | |
| 41 | |
| 42 /* | |
| 43 * We also define an array of register names and their corresponding | |
| 44 * array indices. This is used by the getareg and putareg entry points, | |
| 45 * and also by our register variable discipline. | |
| 46 */ | |
| 47 const mdb_tgt_regdesc_t mdb_ia32_kregs[] = { | |
| 48 { "savfp", KREG_SAVFP, MDB_TGT_R_EXPORT }, | |
| 49 { "savpc", KREG_SAVPC, MDB_TGT_R_EXPORT }, | |
| 50 { "eax", KREG_EAX, MDB_TGT_R_EXPORT }, | |
| 51 { "ebx", KREG_EBX, MDB_TGT_R_EXPORT }, | |
| 52 { "ecx", KREG_ECX, MDB_TGT_R_EXPORT }, | |
| 53 { "edx", KREG_EDX, MDB_TGT_R_EXPORT }, | |
| 54 { "esi", KREG_ESI, MDB_TGT_R_EXPORT }, | |
| 55 { "edi", KREG_EDI, MDB_TGT_R_EXPORT }, | |
| 56 { "ebp", KREG_EBP, MDB_TGT_R_EXPORT }, | |
| 57 { "esp", KREG_ESP, MDB_TGT_R_EXPORT }, | |
| 58 { "cs", KREG_CS, MDB_TGT_R_EXPORT }, | |
| 59 { "ds", KREG_DS, MDB_TGT_R_EXPORT }, | |
| 60 { "ss", KREG_SS, MDB_TGT_R_EXPORT }, | |
| 61 { "es", KREG_ES, MDB_TGT_R_EXPORT }, | |
| 62 { "fs", KREG_FS, MDB_TGT_R_EXPORT }, | |
| 63 { "gs", KREG_GS, MDB_TGT_R_EXPORT }, | |
| 64 { "eflags", KREG_EFLAGS, MDB_TGT_R_EXPORT }, | |
| 65 { "eip", KREG_EIP, MDB_TGT_R_EXPORT }, | |
| 66 { "uesp", KREG_UESP, MDB_TGT_R_EXPORT | MDB_TGT_R_PRIV }, | |
| 67 { "trapno", KREG_TRAPNO, MDB_TGT_R_EXPORT | MDB_TGT_R_PRIV }, | |
| 68 { "err", KREG_ERR, MDB_TGT_R_EXPORT | MDB_TGT_R_PRIV }, | |
| 69 { NULL, 0, 0 } | |
| 70 }; | |
| 71 | |
| 72 void | |
| 73 mdb_ia32_printregs(const mdb_tgt_gregset_t *gregs) | |
| 74 { | |
| 75 const kreg_t *kregs = &gregs->kregs[0]; | |
| 76 kreg_t eflags = kregs[KREG_EFLAGS]; | |
| 77 | |
| 78 mdb_printf("%%cs = 0x%04x\t\t%%eax = 0x%0?p %A\n", | |
| 79 kregs[KREG_CS], kregs[KREG_EAX], kregs[KREG_EAX]); | |
| 80 | |
| 81 mdb_printf("%%ds = 0x%04x\t\t%%ebx = 0x%0?p %A\n", | |
| 82 kregs[KREG_DS], kregs[KREG_EBX], kregs[KREG_EBX]); | |
| 83 | |
| 84 mdb_printf("%%ss = 0x%04x\t\t%%ecx = 0x%0?p %A\n", | |
| 85 kregs[KREG_SS], kregs[KREG_ECX], kregs[KREG_ECX]); | |
| 86 | |
| 87 mdb_printf("%%es = 0x%04x\t\t%%edx = 0x%0?p %A\n", | |
| 88 kregs[KREG_ES], kregs[KREG_EDX], kregs[KREG_EDX]); | |
| 89 | |
| 90 mdb_printf("%%fs = 0x%04x\t\t%%esi = 0x%0?p %A\n", | |
| 91 kregs[KREG_FS], kregs[KREG_ESI], kregs[KREG_ESI]); | |
| 92 | |
| 93 mdb_printf("%%gs = 0x%04x\t\t%%edi = 0x%0?p %A\n\n", | |
| 94 kregs[KREG_GS], kregs[KREG_EDI], kregs[KREG_EDI]); | |
| 95 | |
| 96 mdb_printf("%%eip = 0x%0?p %A\n", kregs[KREG_EIP], kregs[KREG_EIP]); | |
| 97 mdb_printf("%%ebp = 0x%0?p\n", kregs[KREG_EBP]); | |
| 98 mdb_printf("%%esp = 0x%0?p\n\n", kregs[KREG_ESP]); | |
| 99 mdb_printf("%%eflags = 0x%08x\n", eflags); | |
| 100 | |
| 101 mdb_printf(" id=%u vip=%u vif=%u ac=%u vm=%u rf=%u nt=%u iopl=0x%x\n", | |
| 102 (eflags & KREG_EFLAGS_ID_MASK) >> KREG_EFLAGS_ID_SHIFT, | |
| 103 (eflags & KREG_EFLAGS_VIP_MASK) >> KREG_EFLAGS_VIP_SHIFT, | |
| 104 (eflags & KREG_EFLAGS_VIF_MASK) >> KREG_EFLAGS_VIF_SHIFT, | |
| 105 (eflags & KREG_EFLAGS_AC_MASK) >> KREG_EFLAGS_AC_SHIFT, | |
| 106 (eflags & KREG_EFLAGS_VM_MASK) >> KREG_EFLAGS_VM_SHIFT, | |
| 107 (eflags & KREG_EFLAGS_RF_MASK) >> KREG_EFLAGS_RF_SHIFT, | |
| 108 (eflags & KREG_EFLAGS_NT_MASK) >> KREG_EFLAGS_NT_SHIFT, | |
| 109 (eflags & KREG_EFLAGS_IOPL_MASK) >> KREG_EFLAGS_IOPL_SHIFT); | |
| 110 | |
| 111 mdb_printf(" status=<%s,%s,%s,%s,%s,%s,%s,%s,%s>\n\n", | |
| 112 (eflags & KREG_EFLAGS_OF_MASK) ? "OF" : "of", | |
| 113 (eflags & KREG_EFLAGS_DF_MASK) ? "DF" : "df", | |
| 114 (eflags & KREG_EFLAGS_IF_MASK) ? "IF" : "if", | |
| 115 (eflags & KREG_EFLAGS_TF_MASK) ? "TF" : "tf", | |
| 116 (eflags & KREG_EFLAGS_SF_MASK) ? "SF" : "sf", | |
| 117 (eflags & KREG_EFLAGS_ZF_MASK) ? "ZF" : "zf", | |
| 118 (eflags & KREG_EFLAGS_AF_MASK) ? "AF" : "af", | |
| 119 (eflags & KREG_EFLAGS_PF_MASK) ? "PF" : "pf", | |
| 120 (eflags & KREG_EFLAGS_CF_MASK) ? "CF" : "cf"); | |
| 121 | |
| 122 #ifndef _KMDB | |
| 123 mdb_printf(" %%uesp = 0x%0?x\n", kregs[KREG_UESP]); | |
| 124 #endif | |
| 125 mdb_printf("%%trapno = 0x%x\n", kregs[KREG_TRAPNO]); | |
| 126 mdb_printf(" %%err = 0x%x\n", kregs[KREG_ERR]); | |
| 127 } | |
| 128 | |
| 129 /* | |
| 130 * Given a return address (%eip), determine the likely number of arguments | |
| 131 * that were pushed on the stack prior to its execution. We do this by | |
| 132 * expecting that a typical call sequence consists of pushing arguments on | |
| 133 * the stack, executing a call instruction, and then performing an add | |
| 134 * on %esp to restore it to the value prior to pushing the arguments for | |
| 135 * the call. We attempt to detect such an add, and divide the addend | |
| 136 * by the size of a word to determine the number of pushed arguments. | |
| 137 */ | |
| 138 static uint_t | |
| 139 kvm_argcount(mdb_tgt_t *t, uintptr_t eip, ssize_t size) | |
| 140 { | |
| 141 uint8_t ins[6]; | |
| 142 ulong_t n; | |
| 143 | |
| 144 enum { | |
| 145 M_MODRM_ESP = 0xc4, /* Mod/RM byte indicates %esp */ | |
| 146 M_ADD_IMM32 = 0x81, /* ADD imm32 to r/m32 */ | |
| 147 M_ADD_IMM8 = 0x83 /* ADD imm8 to r/m32 */ | |
| 148 }; | |
| 149 | |
| 150 if (mdb_tgt_vread(t, ins, sizeof (ins), eip) != sizeof (ins)) | |
| 151 return (0); | |
| 152 | |
| 153 if (ins[1] != M_MODRM_ESP) | |
| 154 return (0); | |
| 155 | |
| 156 switch (ins[0]) { | |
| 157 case M_ADD_IMM32: | |
| 158 n = ins[2] + (ins[3] << 8) + (ins[4] << 16) + (ins[5] << 24); | |
| 159 break; | |
| 160 | |
| 161 case M_ADD_IMM8: | |
| 162 n = ins[2]; | |
| 163 break; | |
| 164 | |
| 165 default: | |
| 166 n = 0; | |
| 167 } | |
| 168 | |
| 169 return (MIN((ssize_t)n, size) / sizeof (long)); | |
| 170 } | |
| 171 | |
| 172 int | |
| 173 mdb_ia32_kvm_stack_iter(mdb_tgt_t *t, const mdb_tgt_gregset_t *gsp, | |
| 174 mdb_tgt_stack_f *func, void *arg) | |
| 175 { | |
| 176 mdb_tgt_gregset_t gregs; | |
| 177 kreg_t *kregs = &gregs.kregs[0]; | |
| 178 int got_pc = (gsp->kregs[KREG_EIP] != 0); | |
| 179 | |
| 180 struct { | |
| 181 uintptr_t fr_savfp; | |
| 182 uintptr_t fr_savpc; | |
| 183 long fr_argv[32]; | |
| 184 } fr; | |
| 185 | |
| 186 uintptr_t fp = gsp->kregs[KREG_EBP]; | |
| 187 uintptr_t pc = gsp->kregs[KREG_EIP]; | |
| 188 uintptr_t lastfp; | |
| 189 | |
| 190 ssize_t size; | |
| 191 uint_t argc; | |
| 192 int detect_exception_frames = 0; | |
| 193 #ifndef _KMDB | |
| 194 int xp; | |
| 195 | |
| 196 if ((mdb_readsym(&xp, sizeof (xp), "xpv_panicking") != -1) && (xp > 0)) | |
| 197 detect_exception_frames = 1; | |
| 198 #endif | |
| 199 | |
| 200 bcopy(gsp, &gregs, sizeof (gregs)); | |
| 201 | |
| 202 while (fp != 0) { | |
| 203 | |
| 204 if (fp & (STACK_ALIGN - 1)) | |
| 205 return (set_errno(EMDB_STKALIGN)); | |
| 206 | |
| 207 if ((size = mdb_tgt_vread(t, &fr, sizeof (fr), fp)) >= | |
| 208 (ssize_t)(2 * sizeof (uintptr_t))) { | |
| 209 size -= (ssize_t)(2 * sizeof (uintptr_t)); | |
| 210 argc = kvm_argcount(t, fr.fr_savpc, size); | |
| 211 } else { | |
| 212 bzero(&fr, sizeof (fr)); | |
| 213 argc = 0; | |
| 214 } | |
| 215 | |
| 216 if (got_pc && func(arg, pc, argc, fr.fr_argv, &gregs) != 0) | |
| 217 break; | |
| 218 | |
| 219 kregs[KREG_ESP] = kregs[KREG_EBP]; | |
| 220 | |
| 221 lastfp = fp; | |
| 222 fp = fr.fr_savfp; | |
| 223 /* | |
| 224 * The Xen hypervisor marks a stack frame as belonging to | |
| 225 * an exception by inverting the bits of the pointer to | |
| 226 * that frame. We attempt to identify these frames by | |
| 227 * inverting the pointer and seeing if it is within 0xfff | |
| 228 * bytes of the last frame. | |
| 229 */ | |
| 230 if (detect_exception_frames) | |
| 231 if ((fp != 0) && (fp < lastfp) && | |
| 232 ((lastfp ^ ~fp) < 0xfff)) | |
| 233 fp = ~fp; | |
| 234 | |
| 235 kregs[KREG_EBP] = fp; | |
| 236 kregs[KREG_EIP] = pc = fr.fr_savpc; | |
| 237 | |
| 238 got_pc = (pc != 0); | |
| 239 } | |
| 240 | |
| 241 return (0); | |
| 242 } | |
| 243 | |
| 244 /* | |
| 245 * Determine the return address for the current frame. Typically this is the | |
| 246 * fr_savpc value from the current frame, but we also perform some special | |
| 247 * handling to see if we are stopped on one of the first two instructions of a | |
| 248 * typical function prologue, in which case %ebp will not be set up yet. | |
| 249 */ | |
| 250 int | |
| 251 mdb_ia32_step_out(mdb_tgt_t *t, uintptr_t *p, kreg_t pc, kreg_t fp, kreg_t sp, | |
| 252 mdb_instr_t curinstr) | |
| 253 { | |
| 254 struct frame fr; | |
| 255 GElf_Sym s; | |
| 256 char buf[1]; | |
| 257 | |
| 258 enum { | |
| 259 M_PUSHL_EBP = 0x55, /* pushl %ebp */ | |
| 260 M_MOVL_EBP = 0x8b /* movl %esp, %ebp */ | |
| 261 }; | |
| 262 | |
| 263 if (mdb_tgt_lookup_by_addr(t, pc, MDB_TGT_SYM_FUZZY, | |
| 264 buf, 0, &s, NULL) == 0) { | |
| 265 if (pc == s.st_value && curinstr == M_PUSHL_EBP) | |
| 266 fp = sp - 4; | |
| 267 else if (pc == s.st_value + 1 && curinstr == M_MOVL_EBP) | |
| 268 fp = sp; | |
| 269 } | |
| 270 | |
| 271 if (mdb_tgt_vread(t, &fr, sizeof (fr), fp) == sizeof (fr)) { | |
| 272 *p = fr.fr_savpc; | |
| 273 return (0); | |
| 274 } | |
| 275 | |
| 276 return (-1); /* errno is set for us */ | |
| 277 } | |
| 278 | |
| 279 /* | |
| 280 * Return the address of the next instruction following a call, or return -1 | |
| 281 * and set errno to EAGAIN if the target should just single-step. We perform | |
| 282 * a bit of disassembly on the current instruction in order to determine if it | |
| 283 * is a call and how many bytes should be skipped, depending on the exact form | |
| 284 * of the call instruction that is being used. | |
| 285 */ | |
| 286 int | |
| 287 mdb_ia32_next(mdb_tgt_t *t, uintptr_t *p, kreg_t pc, mdb_instr_t curinstr) | |
| 288 { | |
| 289 uint8_t m; | |
| 290 | |
| 291 enum { | |
| 292 M_CALL_REL = 0xe8, /* call near with relative displacement */ | |
| 293 M_CALL_REG = 0xff, /* call near indirect or call far register */ | |
| 294 | |
| 295 M_MODRM_MD = 0xc0, /* mask for Mod/RM byte Mod field */ | |
| 296 M_MODRM_OP = 0x38, /* mask for Mod/RM byte opcode field */ | |
| 297 M_MODRM_RM = 0x07, /* mask for Mod/RM byte R/M field */ | |
| 298 | |
| 299 M_MD_IND = 0x00, /* Mod code for [REG] */ | |
| 300 M_MD_DSP8 = 0x40, /* Mod code for disp8[REG] */ | |
| 301 M_MD_DSP32 = 0x80, /* Mod code for disp32[REG] */ | |
| 302 M_MD_REG = 0xc0, /* Mod code for REG */ | |
| 303 | |
| 304 M_OP_IND = 0x10, /* Opcode for call near indirect */ | |
| 305 M_RM_DSP32 = 0x05 /* R/M code for disp32 */ | |
| 306 }; | |
| 307 | |
| 308 /* | |
| 309 * If the opcode is a near call with relative displacement, assume the | |
| 310 * displacement is a rel32 from the next instruction. | |
| 311 */ | |
| 312 if (curinstr == M_CALL_REL) { | |
| 313 *p = pc + sizeof (mdb_instr_t) + sizeof (uint32_t); | |
| 314 return (0); | |
| 315 } | |
| 316 | |
| 317 /* | |
| 318 * If the opcode is a call near indirect or call far register opcode, | |
| 319 * read the subsequent Mod/RM byte to perform additional decoding. | |
| 320 */ | |
| 321 if (curinstr == M_CALL_REG) { | |
| 322 if (mdb_tgt_vread(t, &m, sizeof (m), pc + 1) != sizeof (m)) | |
| 323 return (-1); /* errno is set for us */ | |
| 324 | |
| 325 /* | |
| 326 * If the Mod/RM opcode extension indicates a near indirect | |
| 327 * call, then skip the appropriate number of additional | |
| 328 * bytes depending on the addressing form that is used. | |
| 329 */ | |
| 330 if ((m & M_MODRM_OP) == M_OP_IND) { | |
| 331 switch (m & M_MODRM_MD) { | |
| 332 case M_MD_DSP8: | |
| 333 *p = pc + 3; /* skip pr_instr, m, disp8 */ | |
| 334 break; | |
| 335 case M_MD_DSP32: | |
| 336 *p = pc + 6; /* skip pr_instr, m, disp32 */ | |
| 337 break; | |
| 338 case M_MD_IND: | |
| 339 if ((m & M_MODRM_RM) == M_RM_DSP32) { | |
| 340 *p = pc + 6; | |
| 341 break; /* skip pr_instr, m, disp32 */ | |
| 342 } | |
| 343 /* FALLTHRU */ | |
| 344 case M_MD_REG: | |
| 345 *p = pc + 2; /* skip pr_instr, m */ | |
| 346 break; | |
| 347 } | |
| 348 return (0); | |
| 349 } | |
| 350 } | |
| 351 | |
| 352 return (set_errno(EAGAIN)); | |
| 353 } | |
| 354 | |
| 355 /*ARGSUSED*/ | |
| 356 int | |
| 357 mdb_ia32_kvm_frame(void *arglim, uintptr_t pc, uint_t argc, const long *argv, | |
| 358 const mdb_tgt_gregset_t *gregs) | |
| 359 { | |
| 360 argc = MIN(argc, (uint_t)arglim); | |
| 361 mdb_printf("%a(", pc); | |
| 362 | |
| 363 if (argc != 0) { | |
| 364 mdb_printf("%lr", *argv++); | |
| 365 for (argc--; argc != 0; argc--) | |
| 366 mdb_printf(", %lr", *argv++); | |
| 367 } | |
| 368 | |
| 369 mdb_printf(")\n"); | |
| 370 return (0); | |
| 371 } | |
| 372 | |
| 373 int | |
| 374 mdb_ia32_kvm_framev(void *arglim, uintptr_t pc, uint_t argc, const long *argv, | |
| 375 const mdb_tgt_gregset_t *gregs) | |
| 376 { | |
| 377 argc = MIN(argc, (uint_t)arglim); | |
| 378 mdb_printf("%0?lr %a(", gregs->kregs[KREG_EBP], pc); | |
| 379 | |
| 380 if (argc != 0) { | |
| 381 mdb_printf("%lr", *argv++); | |
| 382 for (argc--; argc != 0; argc--) | |
| 383 mdb_printf(", %lr", *argv++); | |
| 384 } | |
| 385 | |
| 386 mdb_printf(")\n"); | |
| 387 return (0); | |
| 388 } |