19e9205a23
install custom pager functions didn't actually happen in practice (they all just used the simple pager and passed in a local quit pointer). So, just hardcode the simple pager as the only pager and make it set a global db_pager_quit flag that db commands can check when the user hits 'q' (or a suitable variant) at the pager prompt. Also, now that it's easy to do so, enable paging by default for all ddb commands. Any command that wishes to honor the quit flag can do so by checking db_pager_quit. Note that the pager can also be effectively disabled by setting $lines to 0. Other fixes: - 'show idt' on i386 and pc98 now actually checks the quit flag and terminates early. - 'show intr' now actually checks the quit flag and terminates early.
350 lines
8.6 KiB
C
350 lines
8.6 KiB
C
/*-
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* Copyright (c) 2000 John Baldwin <jhb@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* This module holds the global variables used by KTR and the ktr_tracepoint()
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* function that does the actual tracing.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include "opt_ktr.h"
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#include "opt_alq.h"
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#include <sys/param.h>
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#include <sys/alq.h>
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#include <sys/cons.h>
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#include <sys/kernel.h>
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#include <sys/ktr.h>
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#include <sys/libkern.h>
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#include <sys/proc.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <machine/cpu.h>
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#ifdef __sparc64__
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#include <machine/ktr.h>
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#endif
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#ifdef DDB
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#include <ddb/ddb.h>
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#include <ddb/db_output.h>
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#endif
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#ifndef KTR_ENTRIES
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#define KTR_ENTRIES 1024
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#endif
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#ifndef KTR_MASK
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#define KTR_MASK (KTR_GEN)
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#endif
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#ifndef KTR_CPUMASK
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#define KTR_CPUMASK (~0)
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#endif
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#ifndef KTR_TIME
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#define KTR_TIME get_cyclecount()
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#endif
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#ifndef KTR_CPU
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#define KTR_CPU PCPU_GET(cpuid)
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#endif
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SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RD, 0, "KTR options");
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int ktr_cpumask = KTR_CPUMASK;
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TUNABLE_INT("debug.ktr.cpumask", &ktr_cpumask);
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SYSCTL_INT(_debug_ktr, OID_AUTO, cpumask, CTLFLAG_RW, &ktr_cpumask, 0, "");
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int ktr_mask = KTR_MASK;
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TUNABLE_INT("debug.ktr.mask", &ktr_mask);
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SYSCTL_INT(_debug_ktr, OID_AUTO, mask, CTLFLAG_RW, &ktr_mask, 0, "");
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int ktr_compile = KTR_COMPILE;
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SYSCTL_INT(_debug_ktr, OID_AUTO, compile, CTLFLAG_RD, &ktr_compile, 0, "");
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int ktr_entries = KTR_ENTRIES;
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SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD, &ktr_entries, 0, "");
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int ktr_version = KTR_VERSION;
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SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD, &ktr_version, 0, "");
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volatile int ktr_idx = 0;
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struct ktr_entry ktr_buf[KTR_ENTRIES];
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static int
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sysctl_debug_ktr_clear(SYSCTL_HANDLER_ARGS)
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{
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int clear, error;
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clear = 0;
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error = sysctl_handle_int(oidp, &clear, 0, req);
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if (error || !req->newptr)
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return (error);
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if (clear) {
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bzero(ktr_buf, sizeof(ktr_buf));
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ktr_idx = 0;
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}
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return (error);
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}
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SYSCTL_PROC(_debug_ktr, OID_AUTO, clear, CTLTYPE_INT|CTLFLAG_RW, 0, 0,
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sysctl_debug_ktr_clear, "I", "Clear KTR Buffer");
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#ifdef KTR_VERBOSE
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int ktr_verbose = KTR_VERBOSE;
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TUNABLE_INT("debug.ktr.verbose", &ktr_verbose);
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SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
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#endif
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#ifdef KTR_ALQ
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struct alq *ktr_alq;
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char ktr_alq_file[MAXPATHLEN] = "/tmp/ktr.out";
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int ktr_alq_cnt = 0;
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int ktr_alq_depth = KTR_ENTRIES;
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int ktr_alq_enabled = 0;
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int ktr_alq_failed = 0;
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int ktr_alq_max = 0;
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SYSCTL_INT(_debug_ktr, OID_AUTO, alq_max, CTLFLAG_RW, &ktr_alq_max, 0,
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"Maximum number of entries to write");
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SYSCTL_INT(_debug_ktr, OID_AUTO, alq_cnt, CTLFLAG_RD, &ktr_alq_cnt, 0,
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"Current number of written entries");
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SYSCTL_INT(_debug_ktr, OID_AUTO, alq_failed, CTLFLAG_RD, &ktr_alq_failed, 0,
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"Number of times we overran the buffer");
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SYSCTL_INT(_debug_ktr, OID_AUTO, alq_depth, CTLFLAG_RW, &ktr_alq_depth, 0,
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"Number of items in the write buffer");
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SYSCTL_STRING(_debug_ktr, OID_AUTO, alq_file, CTLFLAG_RW, ktr_alq_file,
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sizeof(ktr_alq_file), "KTR logging file");
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static int
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sysctl_debug_ktr_alq_enable(SYSCTL_HANDLER_ARGS)
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{
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int error;
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int enable;
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enable = ktr_alq_enabled;
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error = sysctl_handle_int(oidp, &enable, 0, req);
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if (error || !req->newptr)
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return (error);
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if (enable) {
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if (ktr_alq_enabled)
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return (0);
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error = suser(curthread);
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if (error)
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return (error);
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error = alq_open(&ktr_alq, (const char *)ktr_alq_file,
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req->td->td_ucred, ALQ_DEFAULT_CMODE,
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sizeof(struct ktr_entry), ktr_alq_depth);
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if (error == 0) {
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ktr_alq_cnt = 0;
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ktr_alq_failed = 0;
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ktr_alq_enabled = 1;
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}
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} else {
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if (ktr_alq_enabled == 0)
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return (0);
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ktr_alq_enabled = 0;
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alq_close(ktr_alq);
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ktr_alq = NULL;
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}
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return (error);
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}
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SYSCTL_PROC(_debug_ktr, OID_AUTO, alq_enable,
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CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_debug_ktr_alq_enable,
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"I", "Enable KTR logging");
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#endif
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void
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ktr_tracepoint(u_int mask, const char *file, int line, const char *format,
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u_long arg1, u_long arg2, u_long arg3, u_long arg4, u_long arg5,
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u_long arg6)
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{
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struct ktr_entry *entry;
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#ifdef KTR_ALQ
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struct ale *ale = NULL;
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#else
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int newindex, saveindex;
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#endif
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#if defined(KTR_VERBOSE) || defined(KTR_ALQ)
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struct thread *td;
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#endif
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int cpu;
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if (panicstr)
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return;
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if ((ktr_mask & mask) == 0)
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return;
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cpu = KTR_CPU;
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if (((1 << cpu) & ktr_cpumask) == 0)
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return;
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#if defined(KTR_VERBOSE) || defined(KTR_ALQ)
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td = curthread;
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if (td->td_pflags & TDP_INKTR)
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return;
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td->td_pflags |= TDP_INKTR;
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#endif
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#ifdef KTR_ALQ
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if (ktr_alq_enabled &&
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td->td_critnest == 0 &&
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(td->td_flags & TDF_IDLETD) == 0 &&
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td != ald_thread) {
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if (ktr_alq_max && ktr_alq_cnt > ktr_alq_max)
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goto done;
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if ((ale = alq_get(ktr_alq, ALQ_NOWAIT)) == NULL) {
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ktr_alq_failed++;
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goto done;
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}
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ktr_alq_cnt++;
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entry = (struct ktr_entry *)ale->ae_data;
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} else
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goto done;
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#else
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do {
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saveindex = ktr_idx;
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newindex = (saveindex + 1) & (KTR_ENTRIES - 1);
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} while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0);
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entry = &ktr_buf[saveindex];
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#endif
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entry->ktr_timestamp = KTR_TIME;
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entry->ktr_cpu = cpu;
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entry->ktr_thread = curthread;
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if (file != NULL)
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while (strncmp(file, "../", 3) == 0)
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file += 3;
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entry->ktr_file = file;
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entry->ktr_line = line;
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#ifdef KTR_VERBOSE
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if (ktr_verbose) {
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#ifdef SMP
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printf("cpu%d ", cpu);
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#endif
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if (ktr_verbose > 1) {
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printf("%s.%d\t", entry->ktr_file,
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entry->ktr_line);
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}
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printf(format, arg1, arg2, arg3, arg4, arg5, arg6);
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printf("\n");
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}
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#endif
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entry->ktr_desc = format;
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entry->ktr_parms[0] = arg1;
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entry->ktr_parms[1] = arg2;
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entry->ktr_parms[2] = arg3;
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entry->ktr_parms[3] = arg4;
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entry->ktr_parms[4] = arg5;
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entry->ktr_parms[5] = arg6;
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#ifdef KTR_ALQ
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if (ale)
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alq_post(ktr_alq, ale);
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done:
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#endif
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#if defined(KTR_VERBOSE) || defined(KTR_ALQ)
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td->td_pflags &= ~TDP_INKTR;
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#endif
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}
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#ifdef DDB
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struct tstate {
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int cur;
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int first;
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};
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static struct tstate tstate;
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static int db_ktr_verbose;
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static int db_mach_vtrace(void);
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DB_SHOW_COMMAND(ktr, db_ktr_all)
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{
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tstate.cur = (ktr_idx - 1) & (KTR_ENTRIES - 1);
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tstate.first = -1;
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db_ktr_verbose = index(modif, 'v') != NULL;
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if (index(modif, 'a') != NULL) {
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db_disable_pager();
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while (cncheckc() != -1)
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if (db_mach_vtrace() == 0)
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break;
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} else {
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while (!db_pager_quit)
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if (db_mach_vtrace() == 0)
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break;
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}
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}
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static int
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db_mach_vtrace(void)
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{
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struct ktr_entry *kp;
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if (tstate.cur == tstate.first) {
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db_printf("--- End of trace buffer ---\n");
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return (0);
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}
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kp = &ktr_buf[tstate.cur];
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/* Skip over unused entries. */
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if (kp->ktr_desc == NULL) {
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db_printf("--- End of trace buffer ---\n");
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return (0);
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}
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db_printf("%d (%p", tstate.cur, kp->ktr_thread);
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#ifdef SMP
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db_printf(":cpu%d", kp->ktr_cpu);
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#endif
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db_printf(")");
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if (db_ktr_verbose) {
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db_printf(" %10.10lld %s.%d", (long long)kp->ktr_timestamp,
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kp->ktr_file, kp->ktr_line);
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}
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db_printf(": ");
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db_printf(kp->ktr_desc, kp->ktr_parms[0], kp->ktr_parms[1],
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kp->ktr_parms[2], kp->ktr_parms[3], kp->ktr_parms[4],
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kp->ktr_parms[5]);
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db_printf("\n");
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if (tstate.first == -1)
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tstate.first = tstate.cur;
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if (--tstate.cur < 0)
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tstate.cur = KTR_ENTRIES - 1;
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return (1);
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}
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#endif /* DDB */
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