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 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 * 25 * Copyright 2018 Joyent, Inc. 26 */ 27 28 /* 29 * Kernel/Debugger Interface (KDI) routines. Called during debugger under 30 * various system states (boot, while running, while the debugger has control). 31 * Functions intended for use while the debugger has control may not grab any 32 * locks or perform any functions that assume the availability of other system 33 * services. 34 */ 35 36 #include <sys/systm.h> 37 #include <sys/x86_archext.h> 38 #include <sys/kdi_impl.h> 39 #include <sys/smp_impldefs.h> 40 #include <sys/psm_types.h> 41 #include <sys/segments.h> 42 #include <sys/archsystm.h> 43 #include <sys/controlregs.h> 44 #include <sys/trap.h> 45 #include <sys/kobj.h> 46 #include <sys/kobj_impl.h> 47 #include <sys/clock_impl.h> 48 49 static void 50 kdi_system_claim(void) 51 { 52 lbolt_debug_entry(); 53 54 psm_notifyf(PSM_DEBUG_ENTER); 55 } 56 57 static void 58 kdi_system_release(void) 59 { 60 psm_notifyf(PSM_DEBUG_EXIT); 61 62 lbolt_debug_return(); 63 } 64 65 static cpu_t * 66 kdi_gdt2cpu(uintptr_t gdtbase) 67 { 68 cpu_t *cp = cpu_list; 69 70 if (cp == NULL) 71 return (NULL); 72 73 do { 74 if (gdtbase == (uintptr_t)cp->cpu_gdt) 75 return (cp); 76 } while ((cp = cp->cpu_next) != cpu_list); 77 78 return (NULL); 79 } 80 81 #if defined(__amd64) 82 uintptr_t 83 kdi_gdt2gsbase(uintptr_t gdtbase) 84 { 85 return ((uintptr_t)kdi_gdt2cpu(gdtbase)); 86 } 87 #endif 88 89 static uintptr_t 90 kdi_get_userlimit(void) 91 { 92 return (_userlimit); 93 } 94 95 static int 96 kdi_get_cpuinfo(uint_t *vendorp, uint_t *familyp, uint_t *modelp) 97 { 98 desctbr_t gdtr; 99 cpu_t *cpu; 100 101 /* 102 * CPU doesn't work until the GDT and gs/GSBASE have been set up. 103 * Boot-loaded kmdb will call us well before then, so we have to 104 * find the current cpu_t the hard way. 105 */ 106 rd_gdtr(&gdtr); 107 if ((cpu = kdi_gdt2cpu(gdtr.dtr_base)) == NULL || 108 !cpuid_checkpass(cpu, 1)) 109 return (EAGAIN); /* cpuid isn't done yet */ 110 111 *vendorp = cpuid_getvendor(cpu); 112 *familyp = cpuid_getfamily(cpu); 113 *modelp = cpuid_getmodel(cpu); 114 115 return (0); 116 } 117 118 void 119 kdi_idtr_set(gate_desc_t *idt, size_t limit) 120 { 121 desctbr_t idtr; 122 123 /* 124 * This rare case could happen if we entered kmdb whilst still on the 125 * fake CPU set up by boot_kdi_tmpinit(). We're trying to restore the 126 * kernel's IDT that we saved on entry, but it was from the fake cpu_t 127 * rather than the real IDT (which is still boot's). It's unpleasant, 128 * but we just encode knowledge that it's idt0 we want to restore. 129 */ 130 if (idt == NULL) 131 idt = idt0; 132 133 CPU->cpu_m.mcpu_idt = idt; 134 idtr.dtr_base = (uintptr_t)idt; 135 idtr.dtr_limit = limit; 136 kdi_idtr_write(&idtr); 137 } 138 139 static void 140 kdi_plat_call(void (*platfn)(void)) 141 { 142 if (platfn != NULL) 143 platfn(); 144 } 145 146 /* 147 * On Intel, most of these are shared between i86*, so this is really an 148 * arch_kdi_init(). 149 */ 150 void 151 mach_kdi_init(kdi_t *kdi) 152 { 153 kdi->kdi_plat_call = kdi_plat_call; 154 kdi->kdi_kmdb_enter = kmdb_enter; 155 kdi->mkdi_activate = kdi_activate; 156 kdi->mkdi_deactivate = kdi_deactivate; 157 kdi->mkdi_idt_switch = kdi_idt_switch; 158 kdi->mkdi_update_drreg = kdi_update_drreg; 159 kdi->mkdi_get_userlimit = kdi_get_userlimit; 160 kdi->mkdi_get_cpuinfo = kdi_get_cpuinfo; 161 kdi->mkdi_stop_slaves = kdi_stop_slaves; 162 kdi->mkdi_start_slaves = kdi_start_slaves; 163 kdi->mkdi_slave_wait = kdi_slave_wait; 164 kdi->mkdi_memrange_add = kdi_memrange_add; 165 kdi->mkdi_reboot = kdi_reboot; 166 } 167 168 void 169 plat_kdi_init(kdi_t *kdi) 170 { 171 kdi->pkdi_system_claim = kdi_system_claim; 172 kdi->pkdi_system_release = kdi_system_release; 173 } 174