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 * Copyright 2018 Joyent, Inc. 26 */ 27 28 /* 29 * Intel-specific portions of the DPI 30 */ 31 32 #include <sys/types.h> 33 #include <sys/trap.h> 34 35 #include <kmdb/kmdb_dpi_impl.h> 36 #include <kmdb/kmdb_fault.h> 37 #include <kmdb/kmdb_kdi.h> 38 #include <mdb/mdb_err.h> 39 #include <mdb/mdb_debug.h> 40 #include <mdb/mdb_kreg.h> 41 #include <mdb/mdb.h> 42 43 void 44 kmdb_dpi_handle_fault(kreg_t trapno, kreg_t pc, kreg_t sp, int cpuid) 45 { 46 kmdb_kdi_system_claim(); 47 48 mdb_dprintf(MDB_DBG_DPI, "\ndpi_handle_fault: trapno %u, pc 0x%0?p, " 49 "sp 0x%0?p\n", (int)trapno, pc, sp); 50 51 switch (trapno) { 52 case T_GPFLT: 53 errno = EACCES; 54 break; 55 default: 56 errno = EMDB_NOMAP; 57 } 58 59 if (kmdb_dpi_fault_pcb != NULL) { 60 longjmp(*kmdb_dpi_fault_pcb, 1); 61 /*NOTREACHED*/ 62 } 63 64 /* Debugger fault */ 65 kmdb_fault(trapno, pc, sp, cpuid); 66 } 67 68 /*ARGSUSED*/ 69 int 70 kmdb_dpi_get_register(const char *regname, kreg_t *kregp) 71 { 72 return (mdb.m_dpi->dpo_get_register(regname, kregp)); 73 } 74 75 /*ARGSUSED*/ 76 int 77 kmdb_dpi_set_register(const char *regname, kreg_t kreg) 78 { 79 return (mdb.m_dpi->dpo_set_register(regname, kreg)); 80 } 81 82 /* 83 * Continue/resume handling. If the target calls kmdb_dpi_resume(), it 84 * expects that the world will be resumed, and that the call will return 85 * when the world has stopped again. 86 * 87 * For support, we have resume_return(), which is called from main() when 88 * the continuation has completed (when the world has stopped again). 89 * set_resume_exit() tells where to jump to actually restart the world. 90 * 91 * CAUTION: This routine may be called *after* mdb_destroy. 92 */ 93 void 94 kmdb_dpi_resume_common(int cmd) 95 { 96 kreg_t pc, trapno; 97 98 ASSERT(kmdb_dpi_resume_requested == 0); 99 100 if (setjmp(kmdb_dpi_resume_pcb) == 0) { 101 (void) kmdb_dpi_get_register("pc", &pc); 102 mdb_dprintf(MDB_DBG_PROC, "Resume requested, pc is %p\n", 103 (void *)pc); 104 105 if (cmd != KMDB_DPI_CMD_RESUME_UNLOAD) 106 kmdb_dpi_resume_requested = 1; 107 108 longjmp(kmdb_dpi_entry_pcb, cmd); 109 /*NOTREACHED*/ 110 111 } else { 112 (void) kmdb_dpi_get_register("pc", &pc); 113 (void) kmdb_dpi_get_register("trapno", &trapno); 114 mdb_dprintf(MDB_DBG_PROC, "Back from resume, pc: %p, " 115 "trapno: %u\n", (void *)pc, (int)trapno); 116 117 kmdb_dpi_resume_requested = 0; 118 119 switch (trapno) { 120 case T_BPTFLT: 121 kmdb_dpi_set_state(DPI_STATE_FAULTED, 122 DPI_STATE_WHY_BKPT); 123 break; 124 case T_DBGENTR: 125 kmdb_dpi_set_state(DPI_STATE_STOPPED, 0); 126 break; 127 default: 128 kmdb_dpi_set_state(DPI_STATE_FAULTED, 129 DPI_STATE_WHY_TRAP); 130 break; 131 } 132 } 133 134 mdb_dprintf(MDB_DBG_PROC, "returning from resume\n"); 135 } 136 137 void 138 kmdb_dpi_reboot(void) 139 { 140 /* 141 * We're going to skip all of the niceties we employ in resume_common, 142 * as we don't plan to ever return. 143 */ 144 longjmp(kmdb_dpi_entry_pcb, KMDB_DPI_CMD_REBOOT); 145 } 146