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      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, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*
     23  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 /*
     30  * SPARC-specific portions of the DPI
     31  */
     32 
     33 #include <sys/types.h>
     34 #include <sys/mmu.h>
     35 #include <sys/trap.h>
     36 #include <sys/machtrap.h>
     37 
     38 #include <kmdb/kmdb_dpi_impl.h>
     39 #include <kmdb/kmdb_asmutil.h>
     40 #include <kmdb/kmdb_promif.h>
     41 #include <kmdb/kmdb_fault.h>
     42 #include <mdb/mdb_err.h>
     43 #include <mdb/mdb_debug.h>
     44 #include <mdb/mdb_kreg.h>
     45 #include <mdb/mdb.h>
     46 
     47 void
     48 kmdb_dpi_handle_fault(kreg_t tt, kreg_t tpc, kreg_t tnpc, kreg_t sp, int cpuid)
     49 {
     50 	mdb_dprintf(MDB_DBG_DPI, "\ndpi_handle_fault: tt 0x%01lx, tpc 0x%0?p, "
     51 	    "tnpc 0x%0?p, sp 0x%0?p, fault_pcb 0x%0?p\n", tt, tpc, tnpc, sp,
     52 	    kmdb_dpi_fault_pcb);
     53 
     54 	switch (tt) {
     55 	case FAST_PROT_TT:
     56 		errno = EACCES;
     57 		break;
     58 	case T_DATA_ERROR:
     59 		errno = EIO;
     60 		break;
     61 #ifdef sun4v
     62 	case T_DATA_MMU_MISS:
     63 #endif /* sun4v */
     64 	case FAST_DMMU_MISS_TT:
     65 	default:
     66 		errno = EMDB_NOMAP;
     67 	}
     68 
     69 	if (kmdb_dpi_fault_pcb != NULL) {
     70 		longjmp(*kmdb_dpi_fault_pcb, 1);
     71 		/*NOTREACHED*/
     72 	}
     73 
     74 	/* Debugger fault */
     75 	kmdb_fault(tt, tpc, sp, cpuid);
     76 }
     77 
     78 int
     79 kmdb_dpi_get_register(const char *regname, kreg_t *kregp)
     80 {
     81 	return (mdb.m_dpi->dpo_get_register(regname, kregp));
     82 }
     83 
     84 int
     85 kmdb_dpi_set_register(const char *regname, kreg_t kreg)
     86 {
     87 	return (mdb.m_dpi->dpo_set_register(regname, kreg));
     88 }
     89 
     90 int
     91 kmdb_dpi_get_rwin(int cpuid, int win, struct rwindow *rwin)
     92 {
     93 	return (mdb.m_dpi->dpo_get_rwin(cpuid, win, rwin));
     94 }
     95 
     96 int
     97 kmdb_dpi_get_nwin(int cpuid)
     98 {
     99 	return (mdb.m_dpi->dpo_get_nwin(cpuid));
    100 }
    101 
    102 void
    103 kmdb_dpi_kernpanic(int cpuid)
    104 {
    105 	mdb.m_dpi->dpo_kernpanic(cpuid);
    106 }
    107 
    108 /*
    109  * Continue/resume handling.  If the target calls kmdb_dpi_resume(), it
    110  * expects that the world will be resumed, and that the call will return
    111  * when the world has stopped again.
    112  *
    113  * For support, we have resume_return(), which is called from main() when
    114  * the continuation has completed (when the world has stopped again).
    115  * set_resume_exit() tells where to jump to actually restart the world.
    116  *
    117  * CAUTION: This routine may be called *after* mdb_destroy.
    118  */
    119 void
    120 kmdb_dpi_resume_common(int cmd)
    121 {
    122 	kreg_t pc, tt;
    123 
    124 	ASSERT(kmdb_dpi_resume_requested == 0);
    125 
    126 	if (setjmp(kmdb_dpi_resume_pcb) == 0) {
    127 		(void) kmdb_dpi_get_register("pc", &pc);
    128 		mdb_dprintf(MDB_DBG_PROC, "Resume requested, pc is %p\n",
    129 		    (void *)pc);
    130 
    131 		if (cmd != KMDB_DPI_CMD_RESUME_UNLOAD)
    132 			kmdb_dpi_resume_requested = 1;
    133 
    134 		longjmp(kmdb_dpi_entry_pcb, cmd);
    135 		/*NOTREACHED*/
    136 
    137 	} else {
    138 		(void) kmdb_dpi_get_register("pc", &pc);
    139 		(void) kmdb_dpi_get_register("tt", &tt);
    140 		mdb_dprintf(MDB_DBG_PROC, "Back from resume, pc: %p, tt: %lx\n",
    141 		    (void *)pc, tt);
    142 
    143 		kmdb_dpi_resume_requested = 0;
    144 
    145 		switch (tt) {
    146 		case T_PA_WATCHPOINT:
    147 			kmdb_dpi_set_state(DPI_STATE_FAULTED,
    148 			    DPI_STATE_WHY_P_WAPT);
    149 			break;
    150 		case T_VA_WATCHPOINT:
    151 			kmdb_dpi_set_state(DPI_STATE_FAULTED,
    152 			    DPI_STATE_WHY_V_WAPT);
    153 			break;
    154 		case ST_KMDB_BREAKPOINT|T_SOFTWARE_TRAP:
    155 		case ST_MON_BREAKPOINT|T_SOFTWARE_TRAP: /* Shouldn't happen */
    156 			kmdb_dpi_set_state(DPI_STATE_FAULTED,
    157 			    DPI_STATE_WHY_BKPT);
    158 			break;
    159 		case ST_KMDB_TRAP|T_SOFTWARE_TRAP:
    160 			kmdb_dpi_set_state(DPI_STATE_STOPPED, 0);
    161 			break;
    162 		default:
    163 			kmdb_dpi_set_state(DPI_STATE_FAULTED,
    164 			    DPI_STATE_WHY_TRAP);
    165 			break;
    166 		}
    167 	}
    168 }
    169