189 lines
5.0 KiB
C
189 lines
5.0 KiB
C
/* $NetBSD: kgdb_machdep.c,v 1.2 2003/07/15 00:24:42 lukem 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/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: kgdb_machdep.c,v 1.2 2003/07/15 00:24:42 lukem Exp $");
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#include "opt_ddb.h"
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#include "opt_kgdb.h"
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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 <uvm/uvm_extern.h>
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#include <machine/frame.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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vaddr_t va;
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size_t len;
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{
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vaddr_t last_va;
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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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if (db_validate_address(va))
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return (0);
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va += PAGE_SIZE;
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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_BREAKPOINT:
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return(SIGTRAP);
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case -1:
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return(SIGSEGV);
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default:
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return(SIGINT);
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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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/*
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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[KGDB_REGNUM_R0 + 0] = regs->tf_r0;
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gdb_regs[KGDB_REGNUM_R0 + 1] = regs->tf_r1;
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gdb_regs[KGDB_REGNUM_R0 + 2] = regs->tf_r2;
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gdb_regs[KGDB_REGNUM_R0 + 3] = regs->tf_r3;
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gdb_regs[KGDB_REGNUM_R0 + 4] = regs->tf_r4;
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gdb_regs[KGDB_REGNUM_R0 + 5] = regs->tf_r5;
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gdb_regs[KGDB_REGNUM_R0 + 6] = regs->tf_r6;
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gdb_regs[KGDB_REGNUM_R0 + 7] = regs->tf_r7;
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gdb_regs[KGDB_REGNUM_R0 + 8] = regs->tf_r8;
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gdb_regs[KGDB_REGNUM_R0 + 9] = regs->tf_r9;
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gdb_regs[KGDB_REGNUM_R0 + 10] = regs->tf_r10;
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gdb_regs[KGDB_REGNUM_R0 + 11] = regs->tf_r11;
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gdb_regs[KGDB_REGNUM_R0 + 12] = regs->tf_r12;
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gdb_regs[KGDB_REGNUM_R0 + 13] = regs->tf_svc_sp;
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gdb_regs[KGDB_REGNUM_R0 + 14] = regs->tf_svc_lr;
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gdb_regs[KGDB_REGNUM_R0 + 15] = regs->tf_pc;
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gdb_regs[KGDB_REGNUM_SPSR] = regs->tf_spsr;
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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_r0 = gdb_regs[KGDB_REGNUM_R0 + 0];
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regs->tf_r1 = gdb_regs[KGDB_REGNUM_R0 + 1];
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regs->tf_r2 = gdb_regs[KGDB_REGNUM_R0 + 2];
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regs->tf_r3 = gdb_regs[KGDB_REGNUM_R0 + 3];
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regs->tf_r4 = gdb_regs[KGDB_REGNUM_R0 + 4];
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regs->tf_r5 = gdb_regs[KGDB_REGNUM_R0 + 5];
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regs->tf_r6 = gdb_regs[KGDB_REGNUM_R0 + 6];
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regs->tf_r7 = gdb_regs[KGDB_REGNUM_R0 + 7];
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regs->tf_r8 = gdb_regs[KGDB_REGNUM_R0 + 8];
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regs->tf_r9 = gdb_regs[KGDB_REGNUM_R0 + 9];
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regs->tf_r10 = gdb_regs[KGDB_REGNUM_R0 + 10];
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regs->tf_r11 = gdb_regs[KGDB_REGNUM_R0 + 11];
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regs->tf_r12 = gdb_regs[KGDB_REGNUM_R0 + 12];
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regs->tf_svc_sp = gdb_regs[KGDB_REGNUM_R0 + 13];
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regs->tf_svc_lr = gdb_regs[KGDB_REGNUM_R0 + 14];
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regs->tf_pc = gdb_regs[KGDB_REGNUM_R0 + 15];
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regs->tf_spsr = gdb_regs[KGDB_REGNUM_SPSR];
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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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asm volatile(KBPT_ASM);
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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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