/* $NetBSD: kgdb_machdep.c,v 1.4 2005/12/24 22:45:34 perry Exp $ */ /* * Copyright (c) 1996 Matthias Pfaller. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Matthias Pfaller. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: kgdb_machdep.c,v 1.4 2005/12/24 22:45:34 perry Exp $"); #include "opt_ddb.h" #include "opt_kgdb.h" #include <sys/param.h> #include <sys/systm.h> #include <sys/kgdb.h> #include <uvm/uvm_extern.h> #include <machine/frame.h> #include <machine/reg.h> #include <machine/trap.h> /* * Determine if the memory at va..(va+len) is valid. */ int kgdb_acc(va, len) vaddr_t va; size_t len; { vaddr_t last_va; last_va = va + len; va &= ~PGOFSET; last_va &= ~PGOFSET; do { if (db_validate_address(va)) return (0); va += PAGE_SIZE; } while (va < last_va); return (1); } /* * Translate a trap number into a unix compatible signal value. * (gdb only understands unix signal numbers). */ int kgdb_signal(type) int type; { switch (type) { case T_BREAKPOINT: return(SIGTRAP); case -1: return(SIGSEGV); default: return(SIGINT); } } /* * Definitions exported from gdb. */ /* * Translate the values stored in the kernel regs struct to the format * understood by gdb. */ void kgdb_getregs(regs, gdb_regs) db_regs_t *regs; kgdb_reg_t *gdb_regs; { gdb_regs[KGDB_REGNUM_R0 + 0] = regs->tf_r0; gdb_regs[KGDB_REGNUM_R0 + 1] = regs->tf_r1; gdb_regs[KGDB_REGNUM_R0 + 2] = regs->tf_r2; gdb_regs[KGDB_REGNUM_R0 + 3] = regs->tf_r3; gdb_regs[KGDB_REGNUM_R0 + 4] = regs->tf_r4; gdb_regs[KGDB_REGNUM_R0 + 5] = regs->tf_r5; gdb_regs[KGDB_REGNUM_R0 + 6] = regs->tf_r6; gdb_regs[KGDB_REGNUM_R0 + 7] = regs->tf_r7; gdb_regs[KGDB_REGNUM_R0 + 8] = regs->tf_r8; gdb_regs[KGDB_REGNUM_R0 + 9] = regs->tf_r9; gdb_regs[KGDB_REGNUM_R0 + 10] = regs->tf_r10; gdb_regs[KGDB_REGNUM_R0 + 11] = regs->tf_r11; gdb_regs[KGDB_REGNUM_R0 + 12] = regs->tf_r12; gdb_regs[KGDB_REGNUM_R0 + 13] = regs->tf_svc_sp; gdb_regs[KGDB_REGNUM_R0 + 14] = regs->tf_svc_lr; gdb_regs[KGDB_REGNUM_R0 + 15] = regs->tf_pc; gdb_regs[KGDB_REGNUM_SPSR] = regs->tf_spsr; } /* * Reverse the above. */ void kgdb_setregs(regs, gdb_regs) db_regs_t *regs; kgdb_reg_t *gdb_regs; { regs->tf_r0 = gdb_regs[KGDB_REGNUM_R0 + 0]; regs->tf_r1 = gdb_regs[KGDB_REGNUM_R0 + 1]; regs->tf_r2 = gdb_regs[KGDB_REGNUM_R0 + 2]; regs->tf_r3 = gdb_regs[KGDB_REGNUM_R0 + 3]; regs->tf_r4 = gdb_regs[KGDB_REGNUM_R0 + 4]; regs->tf_r5 = gdb_regs[KGDB_REGNUM_R0 + 5]; regs->tf_r6 = gdb_regs[KGDB_REGNUM_R0 + 6]; regs->tf_r7 = gdb_regs[KGDB_REGNUM_R0 + 7]; regs->tf_r8 = gdb_regs[KGDB_REGNUM_R0 + 8]; regs->tf_r9 = gdb_regs[KGDB_REGNUM_R0 + 9]; regs->tf_r10 = gdb_regs[KGDB_REGNUM_R0 + 10]; regs->tf_r11 = gdb_regs[KGDB_REGNUM_R0 + 11]; regs->tf_r12 = gdb_regs[KGDB_REGNUM_R0 + 12]; regs->tf_svc_sp = gdb_regs[KGDB_REGNUM_R0 + 13]; regs->tf_svc_lr = gdb_regs[KGDB_REGNUM_R0 + 14]; regs->tf_pc = gdb_regs[KGDB_REGNUM_R0 + 15]; regs->tf_spsr = gdb_regs[KGDB_REGNUM_SPSR]; } /* * Trap into kgdb to wait for debugger to connect, * noting on the console why nothing else is going on. */ void kgdb_connect(verbose) int verbose; { if (kgdb_dev < 0) return; if (verbose) printf("kgdb waiting..."); __asm volatile(KBPT_ASM); if (verbose) printf("connected.\n"); kgdb_debug_panic = 1; } /* * Decide what to do on panic. * (This is called by panic, like Debugger()) */ void kgdb_panic() { if (kgdb_dev >= 0 && kgdb_debug_panic) { printf("entering kgdb\n"); kgdb_connect(kgdb_active == 0); } }