/* $NetBSD: debug.s,v 1.13 2020/09/18 00:04:58 thorpej Exp $ */ /*- * Copyright (c) 1999, 2001 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. */ __KERNEL_RCSID(6, "$NetBSD: debug.s,v 1.13 2020/09/18 00:04:58 thorpej Exp $") #include "opt_multiprocessor.h" #include "opt_ddb.h" #include "opt_kgdb.h" /* * Debugger glue. */ .text inc6: .stabs __FILE__,132,0,0,inc6; .loc 1 __LINE__ /* * Debugger stack. */ #define DEBUG_STACK_SIZE 8192 BSS(debug_stack_bottom, DEBUG_STACK_SIZE) #define debug_stack_top (debug_stack_bottom + DEBUG_STACK_SIZE) /* * alpha_debug: * * Single debugger entry point, handling the housekeeping * chores we need to deal with. * * Arguments are: * * a0 a0 from trap * a1 a1 from trap * a2 a2 from trap * a3 kernel trap entry point * a4 frame pointer */ NESTED_NOPROFILE(alpha_debug, 5, 64, ra, IM_RA|IM_S0|IM_S1|IM_S2|IM_S3|IM_S4|IM_S5, 0) br pv, 1f 1: LDGP(pv) lda t0, FRAME_SIZE*8(a4) /* what would sp have been? */ stq t0, FRAME_SP*8(a4) /* belatedly save sp for ddb view */ lda sp, -64(sp) /* set up stack frame */ stq s0, (0*8)(sp) /* save s0 ... */ stq s1, (1*8)(sp) stq s2, (2*8)(sp) stq s3, (3*8)(sp) stq s4, (4*8)(sp) stq s5, (5*8)(sp) /* ... through s5 */ stq ra, (6*8)(sp) /* save ra */ /* Remember our current stack pointer. */ mov sp, s5 /* Save off our arguments. */ mov a0, s0 mov a1, s1 mov a2, s2 mov a3, s3 mov a4, s4 #if defined(MULTIPROCESSOR) /* Pause all other CPUs. */ ldiq a0, 1 CALL(cpu_pause_resume_all) #endif /* * Switch to the debug stack if we're not on it already. */ lda t0, debug_stack_bottom cmpule sp, t0, t1 /* sp <= debug_stack_bottom */ bne t1, 2f /* yes, switch now */ lda t0, debug_stack_top cmpule t0, sp, t1 /* debug_stack_top <= sp? */ bne t1, 3f /* yes, we're on the debug stack */ 2: lda sp, debug_stack_top /* sp <- debug_stack_top */ 3: /* Dispatch to the debugger. */ #if defined(KGDB) mov s3, a0 /* a0 == entry (trap type) */ mov s4, a1 /* a1 == frame pointer */ CALL(kgdb_trap) br 9f #endif #if defined(DDB) mov s0, a1 /* same arguments as the call */ mov s1, a1 /* to alpha_debug() */ mov s2, a2 /* (these may have been clobbered */ mov s3, a3 /* when pausing other CPUs.) */ mov s4, a4 CALL(ddb_trap) br 9f #endif 9: /* Debugger return value in v0; switch back to our previous stack. */ mov s5, sp #if defined(MULTIPROCESSOR) mov v0, s0 /* Resume all other CPUs. */ mov zero, a0 CALL(cpu_pause_resume_all) mov s0, v0 #endif ldq s0, (0*8)(sp) /* restore s0 ... */ ldq s1, (1*8)(sp) ldq s2, (2*8)(sp) ldq s3, (3*8)(sp) ldq s4, (4*8)(sp) ldq s5, (5*8)(sp) /* ... through s5 */ ldq ra, (6*8)(sp) /* restore ra */ lda sp, 64(sp) /* pop stack frame */ RET END(alpha_debug)
