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Annotation of sys/arch/m68k/m68k/kgdb_m68k.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: kgdb_m68k.c,v 1.2 2003/06/02 23:27:48 millert Exp $   */
                      2: /*     $NetBSD: kgdb_m68k.c,v 1.1 1997/02/12 00:58:01 gwr Exp $        */
                      3:
                      4: /*
                      5:  * Copyright (c) 1990, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * This software was developed by the Computer Systems Engineering group
                      9:  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
                     10:  * contributed to Berkeley.
                     11:  *
                     12:  * All advertising materials mentioning features or use of this software
                     13:  * must display the following acknowledgement:
                     14:  *     This product includes software developed by the University of
                     15:  *     California, Lawrence Berkeley Laboratories.
                     16:  *
                     17:  * Redistribution and use in source and binary forms, with or without
                     18:  * modification, are permitted provided that the following conditions
                     19:  * are met:
                     20:  * 1. Redistributions of source code must retain the above copyright
                     21:  *    notice, this list of conditions and the following disclaimer.
                     22:  * 2. Redistributions in binary form must reproduce the above copyright
                     23:  *    notice, this list of conditions and the following disclaimer in the
                     24:  *    documentation and/or other materials provided with the distribution.
                     25:  * 3. Neither the name of the University nor the names of its contributors
                     26:  *    may be used to endorse or promote products derived from this software
                     27:  *    without specific prior written permission.
                     28:  *
                     29:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     30:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     31:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     32:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     33:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     34:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     35:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     36:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     37:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     38:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     39:  * SUCH DAMAGE.
                     40:  *
                     41:  *     @(#)kgdb_stub.c 8.4 (Berkeley) 1/12/94
                     42:  */
                     43:
                     44: /*
                     45:  * Machine-dependent (m68k) part of the KGDB remote "stub"
                     46:  */
                     47:
                     48: #include <sys/param.h>
                     49: #include <sys/kgdb.h>
                     50:
                     51: #include <machine/frame.h>
                     52: #include <machine/trap.h>
                     53:
                     54: /*
                     55:  * Translate a trap number into a unix compatible signal value.
                     56:  * (gdb only understands unix signal numbers).
                     57:  */
                     58: int
                     59: kgdb_signal(type)
                     60:        int type;
                     61: {
                     62:        int sigval;
                     63:
                     64:        switch (type) {
                     65:
                     66:        case T_ASTFLT:
                     67:        case T_SSIR:
                     68:                sigval = SIGINT;
                     69:                break;
                     70:
                     71:        case T_ILLINST:
                     72:        case T_PRIVINST:
                     73:        case T_FMTERR:
                     74:                sigval = SIGILL;
                     75:                break;
                     76:
                     77:        case T_TRACE:
                     78:        case T_TRAP15:
                     79:                sigval = SIGTRAP;
                     80:                break;
                     81:
                     82:        case T_ZERODIV:
                     83:        case T_CHKINST:
                     84:        case T_TRAPVINST:
                     85:        case T_FPERR:
                     86:        case T_COPERR:
                     87:                sigval = SIGFPE;
                     88:                break;
                     89:
                     90:        case T_BUSERR:
                     91:        case T_ADDRERR:
                     92:                sigval = SIGBUS;
                     93:                break;
                     94:
                     95:        case T_MMUFLT:
                     96:                sigval = SIGSEGV;
                     97:                break;
                     98:
                     99:        default:
                    100:                sigval = SIGEMT;
                    101:                break;
                    102:        }
                    103:        return (sigval);
                    104: }
                    105:
                    106: /*
                    107:  * Definitions exported from gdb.
                    108:  */
                    109: /* KGDB_NUMREGS == 18 */
                    110:
                    111: #define GDB_SR 16
                    112: #define GDB_PC 17
                    113:
                    114:
                    115: /*
                    116:  * Translate the values stored in the kernel regs struct to/from
                    117:  * the format understood by gdb.
                    118:  *
                    119:  * There is a short pad word between SP (A7) and SR which keeps the
                    120:  * kernel stack long word aligned (note that this is in addition to
                    121:  * the stack adjust short that we treat as the upper half of the SR
                    122:  * (always zero).  We must skip this when copying to/from gdb regs.
                    123:  */
                    124:
                    125: void
                    126: kgdb_getregs(regs, gdb_regs)
                    127:        db_regs_t *regs;
                    128:        kgdb_reg_t *gdb_regs;
                    129: {
                    130:        int i;
                    131:
                    132:        for (i = 0; i < 16; i++)
                    133:            gdb_regs[i]  = regs->tf_regs[i];
                    134:        gdb_regs[GDB_SR] = regs->tf_sr;
                    135:        gdb_regs[GDB_PC] = regs->tf_pc;
                    136: }
                    137:
                    138: void
                    139: kgdb_setregs(regs, gdb_regs)
                    140:        db_regs_t *regs;
                    141:        kgdb_reg_t *gdb_regs;
                    142: {
                    143:        int i;
                    144:
                    145:        for (i = 0; i < 16; i++)
                    146:                regs->tf_regs[i] = gdb_regs[i];
                    147:        regs->tf_sr = gdb_regs[GDB_SR] |
                    148:                (regs->tf_sr & PSL_T);
                    149:        regs->tf_pc = gdb_regs[GDB_PC];
                    150: }