/* $NetBSD: kgdb_machdep.c,v 1.6 2022/08/22 13:57:24 hannken Exp $ */ /* * Copyright (c) 1997, 2017 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``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 FOUNDATION OR CONTRIBUTORS * 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. */ /* * 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. * * 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 __KERNEL_RCSID(0, "$NetBSD: kgdb_machdep.c,v 1.6 2022/08/22 13:57:24 hannken Exp $"); #include "opt_ddb.h" /* * Machine-dependent functions for remote KGDB. Originally written * for NetBSD/pc532 by Matthias Pfaller. Modified for NetBSD/i386 * by Jason R. Thorpe. Modified for NetBSD/amd64 by Frank van der Linden. */ #include #include #include #include #include #include /* * Determine if the memory at va..(va+len) is valid. */ int kgdb_acc(vaddr_t va, size_t len) { vaddr_t last_va; pt_entry_t *pte; last_va = va + len; va &= ~PGOFSET; last_va &= ~PGOFSET; do { if (va < VM_MIN_KERNEL_ADDRESS) pte = vtopte(va); else pte = kvtopte(va); if ((*pte & PTE_P) == 0) return 0; if (*pte & PTE_PS) va = (va & PTE_LGFRAME) + NBPD_L2; else va += PAGE_SIZE; } while (va < last_va); return 1; } void kgdb_entry_notice(int type, db_regs_t *regs) { if (type == T_NMI) printf("NMI ... going to debugger\n"); } /* * Translate a trap number into a unix compatible signal value. * (gdb only understands unix signal numbers). */ int kgdb_signal(int type) { switch (type) { case T_NMI: return SIGINT; case T_ALIGNFLT: return SIGILL; case T_BPTFLT: case T_TRCTRAP: return SIGTRAP; case T_ASTFLT: case T_DOUBLEFLT: return SIGEMT; case T_ARITHTRAP: case T_DIVIDE: case T_OFLOW: case T_DNA: case T_FPOPFLT: return SIGFPE; case T_PRIVINFLT: case T_PROTFLT: case T_PAGEFLT: case T_TSSFLT: case T_SEGNPFLT: case T_STKFLT: return SIGSEGV; case T_BOUND: return SIGURG; default: return SIGEMT; } } /* * Translate the values stored in the kernel regs struct to the format * understood by gdb. */ void kgdb_getregs(db_regs_t *regs, kgdb_reg_t *gdb_regs) { #ifdef __x86_64__ gdb_regs[ 0] = regs->tf_rax; gdb_regs[ 1] = regs->tf_rbx; gdb_regs[ 2] = regs->tf_rcx; gdb_regs[ 3] = regs->tf_rdx; gdb_regs[ 4] = regs->tf_rsi; gdb_regs[ 5] = regs->tf_rdi; gdb_regs[ 6] = regs->tf_rbp; gdb_regs[ 7] = regs->tf_rsp; gdb_regs[ 8] = regs->tf_r8; gdb_regs[ 9] = regs->tf_r9; gdb_regs[10] = regs->tf_r10; gdb_regs[11] = regs->tf_r11; gdb_regs[12] = regs->tf_r12; gdb_regs[13] = regs->tf_r13; gdb_regs[14] = regs->tf_r14; gdb_regs[15] = regs->tf_r15; gdb_regs[16] = regs->tf_rip; gdb_regs[17] = regs->tf_rflags; gdb_regs[18] = regs->tf_cs; gdb_regs[19] = regs->tf_ss; #else gdb_regs[ 0] = regs->tf_eax; gdb_regs[ 1] = regs->tf_ecx; gdb_regs[ 2] = regs->tf_edx; gdb_regs[ 3] = regs->tf_ebx; gdb_regs[ 5] = regs->tf_ebp; gdb_regs[ 6] = regs->tf_esi; gdb_regs[ 7] = regs->tf_edi; gdb_regs[ 8] = regs->tf_eip; gdb_regs[ 9] = regs->tf_eflags; gdb_regs[10] = regs->tf_cs; gdb_regs[12] = regs->tf_ds; gdb_regs[13] = regs->tf_es; gdb_regs[14] = regs->tf_fs; gdb_regs[15] = regs->tf_gs; if (KERNELMODE(regs->tf_cs)) { /* * Kernel mode - esp and ss not saved. */ gdb_regs[ 4] = (kgdb_reg_t)®s->tf_esp; /* kernel stack pointer */ gdb_regs[11] = x86_getss(); } #endif } /* * Reverse the above. */ void kgdb_setregs(db_regs_t *regs, kgdb_reg_t *gdb_regs) { #ifdef __x86_64__ regs->tf_rax = gdb_regs[ 0]; regs->tf_rbx = gdb_regs[ 1]; regs->tf_rcx = gdb_regs[ 2]; regs->tf_rdx = gdb_regs[ 3]; regs->tf_rsi = gdb_regs[ 4]; regs->tf_rdi = gdb_regs[ 5]; regs->tf_rbp = gdb_regs[ 6]; regs->tf_rsp = gdb_regs[ 7]; regs->tf_r8 = gdb_regs[ 8]; regs->tf_r9 = gdb_regs[ 9]; regs->tf_r10 = gdb_regs[10]; regs->tf_r11 = gdb_regs[11]; regs->tf_r12 = gdb_regs[12]; regs->tf_r13 = gdb_regs[13]; regs->tf_r14 = gdb_regs[14]; regs->tf_r15 = gdb_regs[15]; regs->tf_rip = gdb_regs[16]; regs->tf_rflags = gdb_regs[17]; regs->tf_cs = gdb_regs[18]; regs->tf_ss = gdb_regs[19]; #else regs->tf_eax = gdb_regs[ 0]; regs->tf_ecx = gdb_regs[ 1]; regs->tf_edx = gdb_regs[ 2]; regs->tf_ebx = gdb_regs[ 3]; regs->tf_ebp = gdb_regs[ 5]; regs->tf_esi = gdb_regs[ 6]; regs->tf_edi = gdb_regs[ 7]; regs->tf_eip = gdb_regs[ 8]; regs->tf_eflags = gdb_regs[ 9]; regs->tf_cs = gdb_regs[10]; regs->tf_ds = gdb_regs[12]; regs->tf_es = gdb_regs[13]; if (KERNELMODE(regs->tf_cs) == 0) { /* * Trapped in user mode - restore esp and ss. */ regs->tf_esp = gdb_regs[ 4]; regs->tf_ss = gdb_regs[11]; } #endif } /* * Trap into kgdb to wait for debugger to connect, * noting on the console why nothing else is going on. */ void kgdb_connect(int verbose) { if (kgdb_dev == NODEV) return; if (verbose) printf("kgdb waiting..."); breakpoint(); 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(void) { if (kgdb_dev != NODEV && kgdb_debug_panic) { printf("entering kgdb\n"); kgdb_connect(kgdb_active == 0); } }