197 lines
5.0 KiB
C
197 lines
5.0 KiB
C
/* $NetBSD: kgdb_machdep.c,v 1.5 1997/04/21 16:17:39 matthias Exp $ */
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/*
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* Copyright (c) 1996 Matthias Pfaller.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Matthias Pfaller.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kgdb.h>
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#include <vm/vm.h>
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#include <machine/cpufunc.h>
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#include <machine/frame.h>
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#include <machine/pte.h>
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#include <machine/reg.h>
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#include <machine/trap.h>
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/*
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* Determine if the memory at va..(va+len) is valid.
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*/
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int
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kgdb_acc(va, len)
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vm_offset_t va;
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size_t len;
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{
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vm_offset_t last_va;
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pt_entry_t pte;
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last_va = va + len;
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va &= ~PGOFSET;
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last_va &= ~PGOFSET;
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do {
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pte = *(pt_entry_t *)pmap_pte(pmap_kernel(), va);
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if ((pte & PG_V) == 0)
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return (0);
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va += NBPG;
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} while (va < last_va);
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return (1);
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}
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/*
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* Translate a trap number into a unix compatible signal value.
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* (gdb only understands unix signal numbers).
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*/
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int
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kgdb_signal(type)
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int type;
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{
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switch (type) {
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case T_NVI:
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case T_NMI:
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case T_AST:
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return(SIGINT);
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case T_ABT:
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case T_NBE:
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case T_RBE:
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return(SIGBUS);
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case T_SLAVE:
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case T_ILL:
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case T_SVC:
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case T_FLG:
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case T_UND:
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return(SIGILL);
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case T_DVZ:
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case T_OVF:
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return(SIGFPE);
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case T_BPT:
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case T_DBG:
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case T_TRC:
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return(SIGTRAP);
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default:
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return(SIGEMT);
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}
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}
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/*
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* Definitions exported from gdb.
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*/
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#define NUM_REGS 25
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#define R0_REGNUM 0 /* General register 0 */
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#define SP_REGNUM 16 /* Contains address of top of stack */
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#define FP_REGNUM 17 /* Contains address of executing stack frame */
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#define PC_REGNUM 18 /* Contains program counter */
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#define PS_REGNUM 19 /* Contains processor status */
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/*
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* Translate the values stored in the kernel regs struct to the format
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* understood by gdb.
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*/
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void
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kgdb_getregs(regs, gdb_regs)
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db_regs_t *regs;
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kgdb_reg_t *gdb_regs;
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{
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gdb_regs[R0_REGNUM + 0] = regs->tf_regs.r_r0;
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gdb_regs[R0_REGNUM + 1] = regs->tf_regs.r_r1;
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gdb_regs[R0_REGNUM + 2] = regs->tf_regs.r_r2;
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gdb_regs[R0_REGNUM + 3] = regs->tf_regs.r_r3;
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gdb_regs[R0_REGNUM + 4] = regs->tf_regs.r_r4;
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gdb_regs[R0_REGNUM + 5] = regs->tf_regs.r_r5;
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gdb_regs[R0_REGNUM + 6] = regs->tf_regs.r_r6;
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gdb_regs[R0_REGNUM + 7] = regs->tf_regs.r_r7;
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gdb_regs[SP_REGNUM ] = regs->tf_regs.r_sp;
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gdb_regs[FP_REGNUM ] = regs->tf_regs.r_fp;
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gdb_regs[PC_REGNUM ] = regs->tf_regs.r_pc;
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gdb_regs[PS_REGNUM ] = regs->tf_regs.r_psr;
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}
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/*
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* Reverse the above.
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*/
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void
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kgdb_setregs(regs, gdb_regs)
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db_regs_t *regs;
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kgdb_reg_t *gdb_regs;
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{
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regs->tf_regs.r_r0 = gdb_regs[R0_REGNUM + 0];
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regs->tf_regs.r_r1 = gdb_regs[R0_REGNUM + 1];
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regs->tf_regs.r_r2 = gdb_regs[R0_REGNUM + 2];
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regs->tf_regs.r_r3 = gdb_regs[R0_REGNUM + 3];
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regs->tf_regs.r_r4 = gdb_regs[R0_REGNUM + 4];
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regs->tf_regs.r_r5 = gdb_regs[R0_REGNUM + 5];
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regs->tf_regs.r_r6 = gdb_regs[R0_REGNUM + 6];
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regs->tf_regs.r_r7 = gdb_regs[R0_REGNUM + 7];
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regs->tf_regs.r_sp = gdb_regs[SP_REGNUM];
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regs->tf_regs.r_fp = gdb_regs[FP_REGNUM];
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regs->tf_regs.r_pc = gdb_regs[PC_REGNUM];
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regs->tf_regs.r_psr = gdb_regs[PS_REGNUM]
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| (regs->tf_regs.r_psr & PSL_T);
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}
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/*
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* Trap into kgdb to wait for debugger to connect,
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* noting on the console why nothing else is going on.
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*/
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void
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kgdb_connect(verbose)
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int verbose;
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{
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if (kgdb_dev < 0)
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return;
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if (verbose)
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printf("kgdb waiting...");
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breakpoint();
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if (verbose)
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printf("connected.\n");
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kgdb_debug_panic = 1;
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}
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/*
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* Decide what to do on panic.
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* (This is called by panic, like Debugger())
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*/
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void
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kgdb_panic()
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{
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if (kgdb_dev >= 0 && kgdb_debug_panic) {
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printf("entering kgdb\n");
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kgdb_connect(kgdb_active == 0);
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}
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}
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