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 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 * 25 * Copyright 2018 Joyent, Inc. 26 */ 27 28 /* 29 * Libkvm Kernel Target Intel 64-bit component 30 * 31 * This file provides the ISA-dependent portion of the libkvm kernel target. 32 * For more details on the implementation refer to mdb_kvm.c. 33 */ 34 35 #include <sys/types.h> 36 #include <sys/reg.h> 37 #include <sys/frame.h> 38 #include <sys/stack.h> 39 #include <sys/sysmacros.h> 40 #include <sys/panic.h> 41 #include <sys/privregs.h> 42 #include <strings.h> 43 44 #include <mdb/mdb_target_impl.h> 45 #include <mdb/mdb_disasm.h> 46 #include <mdb/mdb_modapi.h> 47 #include <mdb/mdb_conf.h> 48 #include <mdb/mdb_kreg_impl.h> 49 #include <mdb/mdb_isautil.h> 50 #include <mdb/mdb_amd64util.h> 51 #include <mdb/kvm_isadep.h> 52 #include <mdb/mdb_kvm.h> 53 #include <mdb/mdb_err.h> 54 #include <mdb/mdb_debug.h> 55 #include <mdb/mdb.h> 56 57 /*ARGSUSED*/ 58 int 59 kt_regs(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 60 { 61 mdb_amd64_printregs((const mdb_tgt_gregset_t *)addr); 62 return (DCMD_OK); 63 } 64 65 static int 66 kt_stack_common(uintptr_t addr, uint_t flags, int argc, 67 const mdb_arg_t *argv, mdb_tgt_stack_f *func) 68 { 69 kt_data_t *kt = mdb.m_target->t_data; 70 void *arg = (void *)(uintptr_t)mdb.m_nargs; 71 mdb_tgt_gregset_t gregs, *grp; 72 73 if (flags & DCMD_ADDRSPEC) { 74 bzero(&gregs, sizeof (gregs)); 75 gregs.kregs[KREG_RBP] = addr; 76 grp = &gregs; 77 } else 78 grp = kt->k_regs; 79 80 if (argc != 0) { 81 if (argv->a_type == MDB_TYPE_CHAR || argc > 1) 82 return (DCMD_USAGE); 83 84 if (argv->a_type == MDB_TYPE_STRING) 85 arg = (void *)mdb_strtoull(argv->a_un.a_str); 86 else 87 arg = (void *)argv->a_un.a_val; 88 } 89 90 (void) mdb_amd64_kvm_stack_iter(mdb.m_target, grp, func, arg); 91 return (DCMD_OK); 92 } 93 94 int 95 kt_stack(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 96 { 97 return (kt_stack_common(addr, flags, argc, argv, mdb_amd64_kvm_frame)); 98 } 99 100 int 101 kt_stackv(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 102 { 103 return (kt_stack_common(addr, flags, argc, argv, mdb_amd64_kvm_framev)); 104 } 105 106 const mdb_tgt_ops_t kt_amd64_ops = { 107 kt_setflags, /* t_setflags */ 108 kt_setcontext, /* t_setcontext */ 109 kt_activate, /* t_activate */ 110 kt_deactivate, /* t_deactivate */ 111 (void (*)())(uintptr_t) mdb_tgt_nop, /* t_periodic */ 112 kt_destroy, /* t_destroy */ 113 kt_name, /* t_name */ 114 (const char *(*)()) mdb_conf_isa, /* t_isa */ 115 kt_platform, /* t_platform */ 116 kt_uname, /* t_uname */ 117 kt_dmodel, /* t_dmodel */ 118 kt_aread, /* t_aread */ 119 kt_awrite, /* t_awrite */ 120 kt_vread, /* t_vread */ 121 kt_vwrite, /* t_vwrite */ 122 kt_pread, /* t_pread */ 123 kt_pwrite, /* t_pwrite */ 124 kt_fread, /* t_fread */ 125 kt_fwrite, /* t_fwrite */ 126 (ssize_t (*)()) mdb_tgt_notsup, /* t_ioread */ 127 (ssize_t (*)()) mdb_tgt_notsup, /* t_iowrite */ 128 kt_vtop, /* t_vtop */ 129 kt_lookup_by_name, /* t_lookup_by_name */ 130 kt_lookup_by_addr, /* t_lookup_by_addr */ 131 kt_symbol_iter, /* t_symbol_iter */ 132 kt_mapping_iter, /* t_mapping_iter */ 133 kt_object_iter, /* t_object_iter */ 134 kt_addr_to_map, /* t_addr_to_map */ 135 kt_name_to_map, /* t_name_to_map */ 136 kt_addr_to_ctf, /* t_addr_to_ctf */ 137 kt_name_to_ctf, /* t_name_to_ctf */ 138 kt_status, /* t_status */ 139 (int (*)())(uintptr_t) mdb_tgt_notsup, /* t_run */ 140 (int (*)())(uintptr_t) mdb_tgt_notsup, /* t_step */ 141 (int (*)())(uintptr_t) mdb_tgt_notsup, /* t_step_out */ 142 (int (*)())(uintptr_t) mdb_tgt_notsup, /* t_next */ 143 (int (*)())(uintptr_t) mdb_tgt_notsup, /* t_cont */ 144 (int (*)())(uintptr_t) mdb_tgt_notsup, /* t_signal */ 145 (int (*)())(uintptr_t) mdb_tgt_null, /* t_add_vbrkpt */ 146 (int (*)())(uintptr_t) mdb_tgt_null, /* t_add_sbrkpt */ 147 (int (*)())(uintptr_t) mdb_tgt_null, /* t_add_pwapt */ 148 (int (*)())(uintptr_t) mdb_tgt_null, /* t_add_vwapt */ 149 (int (*)())(uintptr_t) mdb_tgt_null, /* t_add_iowapt */ 150 (int (*)())(uintptr_t) mdb_tgt_null, /* t_add_sysenter */ 151 (int (*)())(uintptr_t) mdb_tgt_null, /* t_add_sysexit */ 152 (int (*)())(uintptr_t) mdb_tgt_null, /* t_add_signal */ 153 (int (*)())(uintptr_t) mdb_tgt_null, /* t_add_fault */ 154 kt_getareg, /* t_getareg */ 155 kt_putareg, /* t_putareg */ 156 mdb_amd64_kvm_stack_iter, /* t_stack_iter */ 157 (int (*)())(uintptr_t) mdb_tgt_notsup /* t_auxv */ 158 }; 159 160 void 161 kt_regs_to_kregs(struct regs *regs, mdb_tgt_gregset_t *gregs) 162 { 163 gregs->kregs[KREG_SAVFP] = regs->r_savfp; 164 gregs->kregs[KREG_SAVPC] = regs->r_savpc; 165 gregs->kregs[KREG_RDI] = regs->r_rdi; 166 gregs->kregs[KREG_RSI] = regs->r_rsi; 167 gregs->kregs[KREG_RDX] = regs->r_rdx; 168 gregs->kregs[KREG_RCX] = regs->r_rcx; 169 gregs->kregs[KREG_R8] = regs->r_r8; 170 gregs->kregs[KREG_R9] = regs->r_r9; 171 gregs->kregs[KREG_RAX] = regs->r_rax; 172 gregs->kregs[KREG_RBX] = regs->r_rbx; 173 gregs->kregs[KREG_RBP] = regs->r_rbp; 174 gregs->kregs[KREG_R10] = regs->r_r10; 175 gregs->kregs[KREG_R11] = regs->r_r11; 176 gregs->kregs[KREG_R12] = regs->r_r12; 177 gregs->kregs[KREG_R13] = regs->r_r13; 178 gregs->kregs[KREG_R14] = regs->r_r14; 179 gregs->kregs[KREG_R15] = regs->r_r15; 180 gregs->kregs[KREG_DS] = regs->r_ds; 181 gregs->kregs[KREG_ES] = regs->r_es; 182 gregs->kregs[KREG_FS] = regs->r_fs; 183 gregs->kregs[KREG_GS] = regs->r_gs; 184 gregs->kregs[KREG_TRAPNO] = regs->r_trapno; 185 gregs->kregs[KREG_ERR] = regs->r_err; 186 gregs->kregs[KREG_RIP] = regs->r_rip; 187 gregs->kregs[KREG_CS] = regs->r_cs; 188 gregs->kregs[KREG_RFLAGS] = regs->r_rfl; 189 gregs->kregs[KREG_RSP] = regs->r_rsp; 190 gregs->kregs[KREG_SS] = regs->r_ss; 191 } 192 193 void 194 kt_amd64_init(mdb_tgt_t *t) 195 { 196 kt_data_t *kt = t->t_data; 197 panic_data_t pd; 198 struct regs regs; 199 uintptr_t addr; 200 201 /* 202 * Initialize the machine-dependent parts of the kernel target 203 * structure. Once this is complete and we fill in the ops 204 * vector, the target is now fully constructed and we can use 205 * the target API itself to perform the rest of our initialization. 206 */ 207 kt->k_rds = mdb_amd64_kregs; 208 kt->k_regs = mdb_zalloc(sizeof (mdb_tgt_gregset_t), UM_SLEEP); 209 kt->k_regsize = sizeof (mdb_tgt_gregset_t); 210 kt->k_dcmd_regs = kt_regs; 211 kt->k_dcmd_stack = kt_stack; 212 kt->k_dcmd_stackv = kt_stackv; 213 kt->k_dcmd_stackr = kt_stackv; 214 kt->k_dcmd_cpustack = kt_cpustack; 215 kt->k_dcmd_cpuregs = kt_cpuregs; 216 217 t->t_ops = &kt_amd64_ops; 218 219 (void) mdb_dis_select("amd64"); 220 221 /* 222 * Lookup the symbols corresponding to subroutines in locore.s where 223 * we expect a saved regs structure to be pushed on the stack. When 224 * performing stack tracebacks we will attempt to detect interrupt 225 * frames by comparing the %eip value to these symbols. 226 */ 227 (void) mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EXEC, 228 "cmnint", &kt->k_intr_sym, NULL); 229 230 (void) mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EXEC, 231 "cmntrap", &kt->k_trap_sym, NULL); 232 233 /* 234 * Don't attempt to load any thread or register information if 235 * we're examining the live operating system. 236 */ 237 if (kt->k_symfile != NULL && strcmp(kt->k_symfile, "/dev/ksyms") == 0) 238 return; 239 240 /* 241 * If the panicbuf symbol is present and we can consume a panicbuf 242 * header of the appropriate version from this address, then we can 243 * initialize our current register set based on its contents. 244 * Prior to the re-structuring of panicbuf, our only register data 245 * was the panic_regs label_t, into which a setjmp() was performed, 246 * or the panic_reg register pointer, which was only non-zero if 247 * the system panicked as a result of a trap calling die(). 248 */ 249 if (mdb_tgt_readsym(t, MDB_TGT_AS_VIRT, &pd, sizeof (pd), 250 MDB_TGT_OBJ_EXEC, "panicbuf") == sizeof (pd) && 251 pd.pd_version == PANICBUFVERS) { 252 253 size_t pd_size = MIN(PANICBUFSIZE, pd.pd_msgoff); 254 panic_data_t *pdp = mdb_zalloc(pd_size, UM_SLEEP); 255 uint_t i, n; 256 257 (void) mdb_tgt_readsym(t, MDB_TGT_AS_VIRT, pdp, pd_size, 258 MDB_TGT_OBJ_EXEC, "panicbuf"); 259 260 n = (pd_size - (sizeof (panic_data_t) - 261 sizeof (panic_nv_t))) / sizeof (panic_nv_t); 262 263 for (i = 0; i < n; i++) { 264 (void) kt_putareg(t, kt->k_tid, 265 pdp->pd_nvdata[i].pnv_name, 266 pdp->pd_nvdata[i].pnv_value); 267 } 268 269 mdb_free(pdp, pd_size); 270 271 return; 272 }; 273 274 if (mdb_tgt_readsym(t, MDB_TGT_AS_VIRT, &addr, sizeof (addr), 275 MDB_TGT_OBJ_EXEC, "panic_reg") == sizeof (addr) && addr != 0 && 276 mdb_tgt_vread(t, ®s, sizeof (regs), addr) == sizeof (regs)) { 277 kt_regs_to_kregs(®s, kt->k_regs); 278 return; 279 } 280 281 /* 282 * If we can't read any panic regs, then our final try is for any CPU 283 * context that may have been stored (for example, in Xen core dumps). 284 */ 285 if (kt_kvmregs(t, 0, kt->k_regs) == 0) 286 return; 287 288 warn("failed to read panicbuf and panic_reg -- " 289 "current register set will be unavailable\n"); 290 } 291