/* $NetBSD: kgdb_machdep.c,v 1.22 2023/10/25 06:02:14 skrll Exp $ */ /*- * Copyright (c) 1997 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 <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: kgdb_machdep.c,v 1.22 2023/10/25 06:02:14 skrll Exp $"); #include "opt_ddb.h" #if defined(DDB) #error "Can't build DDB and KGDB together." #endif /* * 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/mips by Ethan Solomita */ #include "opt_cputype.h" /* which mips CPUs do we support? */ #include <sys/types.h> #include <sys/systm.h> #include <sys/param.h> #include <sys/proc.h> #include <sys/reboot.h> #include <sys/kgdb.h> #include <uvm/uvm_extern.h> #include <mips/locore.h> #include <mips/pte.h> #include <mips/cpu.h> #include <mips/mips_opcode.h> #include <mips/reg.h> #include <mips/trap.h> #include <dev/cons.h> #include <machine/db_machdep.h> #include <ddb/db_access.h> /* * Is kva a valid address to access? This is used by KGDB. */ static int kvacc(vaddr_t kva) { if (pmap_md_direct_mapped_vaddr_p(kva)) return 1; if (kva < VM_MIN_KERNEL_ADDRESS || kva >= VM_MAX_KERNEL_ADDRESS) return 0; const pt_entry_t * const ptep = pmap_pte_lookup(pmap_kernel(), kva); return ptep != NULL && pte_valid_p(*ptep); } /* * Determine if the memory at va..(va+len) is valid. */ int kgdb_acc(vaddr_t va, size_t len) { vaddr_t last_va; last_va = va + len + PAGE_SIZE - 1; va &= ~PGOFSET; last_va &= ~PGOFSET; for (; va < last_va; va += PAGE_SIZE) { if (kvacc(va) == 0) return 0; } return (1); } /* * 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_TLB_MOD: case T_TLB_MOD+T_USER: case T_TLB_LD_MISS: case T_TLB_ST_MISS: case T_TLB_LD_MISS+T_USER: case T_TLB_ST_MISS+T_USER: case T_ADDR_ERR_LD: /* misaligned access */ case T_ADDR_ERR_ST: /* misaligned access */ case T_BUS_ERR_LD_ST: /* BERR asserted to CPU */ case T_ADDR_ERR_LD+T_USER: /* misaligned or kseg access */ case T_ADDR_ERR_ST+T_USER: /* misaligned or kseg access */ case T_BUS_ERR_IFETCH+T_USER: /* BERR asserted to CPU */ case T_BUS_ERR_LD_ST+T_USER: /* BERR asserted to CPU */ return (SIGSEGV); case T_BREAK: case T_BREAK+T_USER: return (SIGTRAP); case T_RES_INST+T_USER: case T_COP_UNUSABLE+T_USER: return (SIGILL); case T_FPE+T_USER: case T_OVFLOW+T_USER: return (SIGFPE); default: return (SIGEMT); } } mips_reg_t kgdb_cause, kgdb_vaddr; /* set by trap() */ /* * Translate the values stored in the db_regs_t struct to the format * understood by gdb. */ void kgdb_getregs(db_regs_t *regs, kgdb_reg_t *gdb_regs) { memset(gdb_regs, 0, KGDB_NUMREGS * sizeof(kgdb_reg_t)); gdb_regs[ 1] = regs->r_regs[_R_AST]; /* AT */ gdb_regs[ 2] = regs->r_regs[_R_V0]; /* V0 */ gdb_regs[ 3] = regs->r_regs[_R_V1]; /* V1 */ gdb_regs[ 4] = regs->r_regs[_R_A0]; /* A0 */ gdb_regs[ 5] = regs->r_regs[_R_A1]; /* A1 */ gdb_regs[ 6] = regs->r_regs[_R_A2]; /* A2 */ gdb_regs[ 7] = regs->r_regs[_R_A3]; /* A3 */ #if defined(__mips_n32) || defined(__mips_n64) gdb_regs[ 8] = regs->r_regs[_R_A4]; /* A4 */ gdb_regs[ 9] = regs->r_regs[_R_A5]; /* A5 */ gdb_regs[10] = regs->r_regs[_R_A6]; /* A6 */ gdb_regs[11] = regs->r_regs[_R_A7]; /* A7 */ gdb_regs[12] = regs->r_regs[_R_T0]; /* T0 */ gdb_regs[13] = regs->r_regs[_R_T1]; /* T1 */ gdb_regs[14] = regs->r_regs[_R_T2]; /* T2 */ gdb_regs[15] = regs->r_regs[_R_T3]; /* T3 */ #else gdb_regs[ 8] = regs->r_regs[_R_T0]; /* T0 */ gdb_regs[ 9] = regs->r_regs[_R_T1]; /* T1 */ gdb_regs[10] = regs->r_regs[_R_T2]; /* T2 */ gdb_regs[11] = regs->r_regs[_R_T3]; /* T3 */ gdb_regs[12] = regs->r_regs[_R_T4]; /* T4 */ gdb_regs[13] = regs->r_regs[_R_T5]; /* T5 */ gdb_regs[14] = regs->r_regs[_R_T6]; /* T6 */ gdb_regs[15] = regs->r_regs[_R_T7]; /* T7 */ #endif /* __mips_n32 || __mips_n64 */ gdb_regs[16] = regs->r_regs[_R_S0]; /* S0 */ gdb_regs[17] = regs->r_regs[_R_S1]; /* S1 */ gdb_regs[18] = regs->r_regs[_R_S2]; /* S2 */ gdb_regs[19] = regs->r_regs[_R_S3]; /* S3 */ gdb_regs[20] = regs->r_regs[_R_S4]; /* S4 */ gdb_regs[21] = regs->r_regs[_R_S5]; /* S5 */ gdb_regs[22] = regs->r_regs[_R_S6]; /* S6 */ gdb_regs[23] = regs->r_regs[_R_S7]; /* S7 */ gdb_regs[24] = regs->r_regs[_R_T8]; /* T8 */ gdb_regs[25] = regs->r_regs[_R_T9]; /* T9 */ gdb_regs[28] = regs->r_regs[_R_GP]; /* GP */ gdb_regs[29] = regs->r_regs[_R_SP]; /* SP */ gdb_regs[30] = regs->r_regs[_R_S8]; /* S8 */ gdb_regs[31] = regs->r_regs[_R_RA]; /* RA */ gdb_regs[32] = regs->r_regs[_R_SR]; /* SR */ gdb_regs[33] = regs->r_regs[_R_MULLO]; /* MULLO */ gdb_regs[34] = regs->r_regs[_R_MULHI]; /* MULHI */ gdb_regs[35] = kgdb_vaddr; /* BAD VADDR */ gdb_regs[36] = kgdb_cause; /* CAUSE */ gdb_regs[37] = regs->r_regs[_R_PC]; /* PC */ } /* * Reverse the above. */ void kgdb_setregs(db_regs_t *regs, kgdb_reg_t *gdb_regs) { regs->r_regs[_R_PC] = gdb_regs[37]; /* PC */ } /* * 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 < 0) return; if (verbose) printf("kgdb waiting..."); __asm("break"); 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); } }
