Annotation of sys/arch/i386/i386/kgdb_machdep.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: kgdb_machdep.c,v 1.8 2007/02/20 21:15:01 tom Exp $ */
! 2: /* $NetBSD: kgdb_machdep.c,v 1.6 1998/08/13 21:36:03 thorpej Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1997 The NetBSD Foundation, Inc.
! 6: * All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to The NetBSD Foundation
! 9: * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
! 10: * NASA Ames Research Center.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. All advertising materials mentioning features or use of this software
! 21: * must display the following acknowledgement:
! 22: * This product includes software developed by the NetBSD
! 23: * Foundation, Inc. and its contributors.
! 24: * 4. Neither the name of The NetBSD Foundation nor the names of its
! 25: * contributors may be used to endorse or promote products derived
! 26: * from this software without specific prior written permission.
! 27: *
! 28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 38: * POSSIBILITY OF SUCH DAMAGE.
! 39: */
! 40:
! 41: /*
! 42: * Copyright (c) 1996 Matthias Pfaller.
! 43: * All rights reserved.
! 44: *
! 45: * Redistribution and use in source and binary forms, with or without
! 46: * modification, are permitted provided that the following conditions
! 47: * are met:
! 48: * 1. Redistributions of source code must retain the above copyright
! 49: * notice, this list of conditions and the following disclaimer.
! 50: * 2. Redistributions in binary form must reproduce the above copyright
! 51: * notice, this list of conditions and the following disclaimer in the
! 52: * documentation and/or other materials provided with the distribution.
! 53: * 3. All advertising materials mentioning features or use of this software
! 54: * must display the following acknowledgement:
! 55: * This product includes software developed by Matthias Pfaller.
! 56: * 4. The name of the author may not be used to endorse or promote products
! 57: * derived from this software without specific prior written permission
! 58: *
! 59: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 60: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 61: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 62: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 63: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 64: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 65: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 66: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 67: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 68: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 69: */
! 70:
! 71: #if defined(DDB)
! 72: #error "Can't build DDB and KGDB together."
! 73: #endif
! 74:
! 75: /*
! 76: * Machine-dependent functions for remote KGDB. Originally written
! 77: * for NetBSD/pc532 by Matthias Pfaller. Modified for NetBSD/i386
! 78: * by Jason R. Thorpe.
! 79: */
! 80:
! 81: #include <sys/param.h>
! 82: #include <sys/kgdb.h>
! 83: #include <sys/systm.h>
! 84:
! 85: #include <uvm/uvm_extern.h>
! 86:
! 87: #include <machine/pte.h>
! 88: #include <machine/reg.h>
! 89: #include <machine/trap.h>
! 90:
! 91: /*
! 92: * Determine if the memory at va..(va+len) is valid.
! 93: */
! 94: int
! 95: kgdb_acc(vaddr_t va, size_t len)
! 96: {
! 97: vaddr_t last_va;
! 98: pt_entry_t *pte;
! 99:
! 100: last_va = va + len;
! 101: va &= ~PGOFSET;
! 102: last_va &= ~PGOFSET;
! 103:
! 104: do {
! 105: pte = kvtopte(va);
! 106: if ((*pte & PG_V) == 0)
! 107: return (0);
! 108: va += NBPG;
! 109: } while (va < last_va);
! 110:
! 111: return (1);
! 112: }
! 113:
! 114: /*
! 115: * Translate a trap number into a unix compatible signal value.
! 116: * (gdb only understands unix signal numbers).
! 117: */
! 118: int
! 119: kgdb_signal(int type)
! 120: {
! 121: switch (type) {
! 122: case T_NMI:
! 123: return (SIGINT);
! 124:
! 125: case T_ALIGNFLT:
! 126: return (SIGILL);
! 127:
! 128: case T_BPTFLT:
! 129: case T_TRCTRAP:
! 130: return (SIGTRAP);
! 131:
! 132: case T_ASTFLT:
! 133: case T_DOUBLEFLT:
! 134: return (SIGEMT);
! 135:
! 136: case T_ARITHTRAP:
! 137: case T_DIVIDE:
! 138: case T_OFLOW:
! 139: case T_DNA:
! 140: case T_FPOPFLT:
! 141: return (SIGFPE);
! 142:
! 143: case T_PRIVINFLT:
! 144: case T_PROTFLT:
! 145: case T_PAGEFLT:
! 146: case T_TSSFLT:
! 147: case T_SEGNPFLT:
! 148: case T_STKFLT:
! 149: return (SIGSEGV);
! 150:
! 151: case T_BOUND:
! 152: return (SIGURG);
! 153:
! 154: default:
! 155: return (SIGEMT);
! 156: }
! 157: }
! 158:
! 159: /*
! 160: * Translate the values stored in the kernel regs struct to the format
! 161: * understood by gdb.
! 162: */
! 163: void
! 164: kgdb_getregs(db_regs_t *regs, kgdb_reg_t *gdb_regs)
! 165: {
! 166:
! 167: gdb_regs[ 0] = regs->tf_eax;
! 168: gdb_regs[ 1] = regs->tf_ecx;
! 169: gdb_regs[ 2] = regs->tf_edx;
! 170: gdb_regs[ 3] = regs->tf_ebx;
! 171: gdb_regs[ 5] = regs->tf_ebp;
! 172: gdb_regs[ 6] = regs->tf_esi;
! 173: gdb_regs[ 7] = regs->tf_edi;
! 174: gdb_regs[ 8] = regs->tf_eip;
! 175: gdb_regs[ 9] = regs->tf_eflags;
! 176: gdb_regs[10] = regs->tf_cs;
! 177: gdb_regs[12] = regs->tf_ds;
! 178: gdb_regs[13] = regs->tf_es;
! 179: gdb_regs[14] = regs->tf_fs;
! 180: gdb_regs[15] = regs->tf_gs;
! 181:
! 182: if (KERNELMODE(regs->tf_cs, regs->tf_eflags)) {
! 183: /*
! 184: * Kernel mode - esp and ss not saved.
! 185: */
! 186: gdb_regs[ 4] = (kgdb_reg_t)®s->tf_esp; /* kernel stack
! 187: pointer */
! 188: __asm __volatile("movw %%ss,%w0" : "=r" (gdb_regs[11]));
! 189: }
! 190: }
! 191:
! 192: /*
! 193: * Reverse the above.
! 194: */
! 195: void
! 196: kgdb_setregs(db_regs_t *regs, kgdb_reg_t *gdb_regs)
! 197: {
! 198:
! 199: regs->tf_eax = gdb_regs[ 0];
! 200: regs->tf_ecx = gdb_regs[ 1];
! 201: regs->tf_edx = gdb_regs[ 2];
! 202: regs->tf_ebx = gdb_regs[ 3];
! 203: regs->tf_ebp = gdb_regs[ 5];
! 204: regs->tf_esi = gdb_regs[ 6];
! 205: regs->tf_edi = gdb_regs[ 7];
! 206: regs->tf_eip = gdb_regs[ 8];
! 207: regs->tf_eflags = gdb_regs[ 9];
! 208: regs->tf_cs = gdb_regs[10];
! 209: regs->tf_ds = gdb_regs[12];
! 210: regs->tf_es = gdb_regs[13];
! 211:
! 212: if (KERNELMODE(regs->tf_cs, regs->tf_eflags) == 0) {
! 213: /*
! 214: * Trapped in user mode - restore esp and ss.
! 215: */
! 216: regs->tf_esp = gdb_regs[ 4];
! 217: regs->tf_ss = gdb_regs[11];
! 218: }
! 219: }
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