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debug.c
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Editing: debug.c
/* * Copyright (c) 2015 Roger Pau Monné <roger.pau@citrix.com> * 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 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 AUTHOR 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. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include "opt_stack.h" #include "opt_ddb.h" #include <sys/param.h> #include <sys/systm.h> #include <sys/bus.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/module.h> #include <sys/mutex.h> #include <sys/pcpu.h> #include <sys/smp.h> #include <sys/stack.h> #include <sys/sbuf.h> #include <xen/xen-os.h> #include <xen/xen_intr.h> #include <xen/hypervisor.h> /* * Xen debug device * * Handles the VIRQ_DEBUG interrupt and prints the backtrace of each * vCPU on the Xen console. */ DPCPU_DEFINE(xen_intr_handle_t, xendebug_handler); static struct mtx lock; static struct sbuf *buf; static int xendebug_drain(void *arg, const char *str, int len) { HYPERVISOR_console_write(__DECONST(char *, str), len); return (len); } extern void stack_capture(struct stack *st, register_t rbp); static int xendebug_filter(void *arg) { #if defined(STACK) && defined(DDB) struct stack st; struct trapframe *frame; frame = arg; stack_zero(&st); stack_save(&st); mtx_lock_spin(&lock); sbuf_clear(buf); xc_printf("Printing stack trace vCPU%d\n", PCPU_GET(vcpu_id)); stack_sbuf_print_ddb(buf, &st); sbuf_finish(buf); mtx_unlock_spin(&lock); #endif return (FILTER_HANDLED); } static void xendebug_identify(driver_t *driver, device_t parent) { KASSERT(xen_domain(), ("Trying to add Xen debug device to non-xen guest")); if (xen_hvm_domain() && !xen_vector_callback_enabled) return; if (BUS_ADD_CHILD(parent, 0, "debug", 0) == NULL) panic("Unable to add Xen debug device."); } static int xendebug_probe(device_t dev) { device_set_desc(dev, "Xen debug handler"); return (BUS_PROBE_NOWILDCARD); } static int xendebug_attach(device_t dev) { int i, error; mtx_init(&lock, "xen-dbg", NULL, MTX_SPIN); buf = sbuf_new(NULL, NULL, 1024, SBUF_FIXEDLEN); if (buf == NULL) panic("Unable to create sbuf for stack dump"); sbuf_set_drain(buf, xendebug_drain, NULL); /* Bind an event channel to a VIRQ on each VCPU. */ CPU_FOREACH(i) { error = xen_intr_bind_virq(dev, VIRQ_DEBUG, i, xendebug_filter, NULL, NULL, INTR_TYPE_TTY, DPCPU_ID_PTR(i, xendebug_handler)); if (error != 0) { printf("Failed to bind VIRQ_DEBUG to vCPU %d: %d", i, error); continue; } xen_intr_describe(DPCPU_ID_GET(i, xendebug_handler), "d%d", i); } return (0); } static device_method_t xendebug_methods[] = { DEVMETHOD(device_identify, xendebug_identify), DEVMETHOD(device_probe, xendebug_probe), DEVMETHOD(device_attach, xendebug_attach), DEVMETHOD_END }; static driver_t xendebug_driver = { "debug", xendebug_methods, 0, }; devclass_t xendebug_devclass; DRIVER_MODULE(xendebug, xenpv, xendebug_driver, xendebug_devclass, 0, 0); MODULE_DEPEND(xendebug, xenpv, 1, 1, 1);
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