597 lines
12 KiB
C
597 lines
12 KiB
C
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/*-
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* Copyright (C) 2008 John Birrell <jb@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(s), this list of conditions and the following disclaimer as
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* the first lines of this file unmodified other than the possible
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* addition of one or more copyright notices.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice(s), 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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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* 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 SUCH
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* DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#ifdef DEBUG
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#if defined(__amd64__)
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static __inline int
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dtrace_cmpset_long(volatile u_long *dst, u_long exp, u_long src)
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{
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u_char res;
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__asm __volatile(
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" lock ; "
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" cmpxchgq %2,%1 ; "
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" sete %0 ; "
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"1: "
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"# dtrace_cmpset_long"
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: "=a" (res), /* 0 */
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"=m" (*dst) /* 1 */
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: "r" (src), /* 2 */
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"a" (exp), /* 3 */
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"m" (*dst) /* 4 */
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: "memory");
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return (res);
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}
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#elif defined(__i386__)
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static __inline int
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dtrace_cmpset_long(volatile u_long *dst, u_long exp, u_long src)
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{
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u_char res;
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__asm __volatile(
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" lock ; "
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" cmpxchgl %2,%1 ; "
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" sete %0 ; "
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"1: "
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"# dtrace_cmpset_long"
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: "=a" (res), /* 0 */
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"=m" (*dst) /* 1 */
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: "r" (src), /* 2 */
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"a" (exp), /* 3 */
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"m" (*dst) /* 4 */
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: "memory");
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return (res);
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}
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#endif
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#define DTRACE_DEBUG_BUFR_SIZE (32 * 1024)
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struct dtrace_debug_data {
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char bufr[DTRACE_DEBUG_BUFR_SIZE];
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char *first;
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char *last;
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char *next;
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} dtrace_debug_data[MAXCPU];
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static char dtrace_debug_bufr[DTRACE_DEBUG_BUFR_SIZE];
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static volatile u_long dtrace_debug_flag[MAXCPU];
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static void
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dtrace_debug_lock(int cpu)
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{
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while (dtrace_cmpset_long(&dtrace_debug_flag[cpu], 0, 1) == 0)
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/* Loop until the lock is obtained. */
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;
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}
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static void
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dtrace_debug_unlock(int cpu)
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{
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dtrace_debug_flag[cpu] = 0;
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}
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static void
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dtrace_debug_init(void *dummy)
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{
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int i;
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struct dtrace_debug_data *d;
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for (i = 0; i <= mp_maxid; i++) {
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if (pcpu_find(i) == NULL)
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continue;
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d = &dtrace_debug_data[i];
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if (d->first == NULL) {
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d->first = d->bufr;
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d->next = d->bufr;
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d->last = d->bufr + DTRACE_DEBUG_BUFR_SIZE - 1;
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*(d->last) = '\0';
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}
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}
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}
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SYSINIT(dtrace_debug_init, SI_SUB_KDTRACE, SI_ORDER_ANY, dtrace_debug_init, NULL);
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SYSINIT(dtrace_debug_smpinit, SI_SUB_SMP, SI_ORDER_ANY, dtrace_debug_init, NULL);
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static void
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dtrace_debug_output(void)
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{
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char *p;
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int i;
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struct dtrace_debug_data *d;
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uintptr_t count;
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for (i = 0; i <= mp_maxid; i++) {
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if (pcpu_find(i) == NULL)
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continue;
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dtrace_debug_lock(i);
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d = &dtrace_debug_data[i];
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count = 0;
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if (d->first < d->next) {
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char *p1 = dtrace_debug_bufr;
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count = (uintptr_t) d->next - (uintptr_t) d->first;
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for (p = d->first; p < d->next; p++)
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*p1++ = *p;
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} else if (d->next > d->first) {
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char *p1 = dtrace_debug_bufr;
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count = (uintptr_t) d->last - (uintptr_t) d->first;
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for (p = d->first; p < d->last; p++)
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*p1++ = *p;
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count += (uintptr_t) d->next - (uintptr_t) d->bufr;
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for (p = d->bufr; p < d->next; p++)
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*p1++ = *p;
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}
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d->first = d->bufr;
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d->next = d->bufr;
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dtrace_debug_unlock(i);
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if (count > 0) {
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char *last = dtrace_debug_bufr + count;
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p = dtrace_debug_bufr;
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while (p < last) {
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if (*p == '\0') {
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p++;
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continue;
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}
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printf("%s", p);
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p += strlen(p);
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}
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}
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}
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}
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/*
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* Functions below here are called from the probe context, so they can't call
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* _any_ functions outside the dtrace module without running foul of the function
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* boundary trace provider (fbt). The purpose of these functions is limited to
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* buffering debug strings for output when the probe completes on the current CPU.
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*/
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static __inline void
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dtrace_debug__putc(char c)
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{
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struct dtrace_debug_data *d = &dtrace_debug_data[curcpu];
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*d->next++ = c;
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if (d->next == d->last)
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d->next = d->bufr;
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*(d->next) = '\0';
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if (d->next == d->first)
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d->first++;
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if (d->first == d->last)
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d->first = d->bufr;
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}
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static void __used
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dtrace_debug_putc(char c)
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{
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dtrace_debug_lock(curcpu);
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dtrace_debug__putc(c);
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dtrace_debug_unlock(curcpu);
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}
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static void __used
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dtrace_debug_puts(const char *s)
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{
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dtrace_debug_lock(curcpu);
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while (*s != '\0')
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dtrace_debug__putc(*s++);
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dtrace_debug__putc('\0');
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dtrace_debug_unlock(curcpu);
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}
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/*
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* Snaffled from sys/kern/subr_prf.c
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*
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* Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
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* order; return an optional length and a pointer to the last character
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* written in the buffer (i.e., the first character of the string).
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* The buffer pointed to by `nbuf' must have length >= MAXNBUF.
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*/
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static char *
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dtrace_debug_ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
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{
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char *p, c;
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p = nbuf;
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*p = '\0';
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do {
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c = hex2ascii(num % base);
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*++p = upper ? toupper(c) : c;
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} while (num /= base);
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if (lenp)
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*lenp = p - nbuf;
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return (p);
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}
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#define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
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static void
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dtrace_debug_vprintf(const char *fmt, va_list ap)
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{
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char nbuf[MAXNBUF];
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const char *p, *percent, *q;
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u_char *up;
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int ch, n;
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uintmax_t num;
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int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
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int cflag, hflag, jflag, tflag, zflag;
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int dwidth, upper;
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int radix = 10;
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char padc;
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int stop = 0, retval = 0;
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num = 0;
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if (fmt == NULL)
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fmt = "(fmt null)\n";
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for (;;) {
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padc = ' ';
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width = 0;
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while ((ch = (u_char)*fmt++) != '%' || stop) {
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if (ch == '\0') {
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dtrace_debug__putc('\0');
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return;
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}
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dtrace_debug__putc(ch);
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}
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percent = fmt - 1;
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qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
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sign = 0; dot = 0; dwidth = 0; upper = 0;
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cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
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reswitch: switch (ch = (u_char)*fmt++) {
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case '.':
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dot = 1;
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goto reswitch;
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case '#':
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sharpflag = 1;
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goto reswitch;
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case '+':
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sign = 1;
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goto reswitch;
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case '-':
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ladjust = 1;
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goto reswitch;
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case '%':
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dtrace_debug__putc(ch);
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break;
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case '*':
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if (!dot) {
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width = va_arg(ap, int);
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if (width < 0) {
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ladjust = !ladjust;
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width = -width;
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}
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} else {
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dwidth = va_arg(ap, int);
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}
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goto reswitch;
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case '0':
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if (!dot) {
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padc = '0';
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goto reswitch;
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}
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case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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for (n = 0;; ++fmt) {
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n = n * 10 + ch - '0';
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ch = *fmt;
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if (ch < '0' || ch > '9')
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break;
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}
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if (dot)
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dwidth = n;
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else
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width = n;
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goto reswitch;
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case 'b':
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num = (u_int)va_arg(ap, int);
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p = va_arg(ap, char *);
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for (q = dtrace_debug_ksprintn(nbuf, num, *p++, NULL, 0); *q;)
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dtrace_debug__putc(*q--);
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if (num == 0)
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break;
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for (tmp = 0; *p;) {
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n = *p++;
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if (num & (1 << (n - 1))) {
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dtrace_debug__putc(tmp ? ',' : '<');
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for (; (n = *p) > ' '; ++p)
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dtrace_debug__putc(n);
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tmp = 1;
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} else
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for (; *p > ' '; ++p)
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continue;
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}
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if (tmp)
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dtrace_debug__putc('>');
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break;
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case 'c':
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dtrace_debug__putc(va_arg(ap, int));
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break;
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case 'D':
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up = va_arg(ap, u_char *);
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p = va_arg(ap, char *);
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if (!width)
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width = 16;
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while(width--) {
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dtrace_debug__putc(hex2ascii(*up >> 4));
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dtrace_debug__putc(hex2ascii(*up & 0x0f));
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up++;
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if (width)
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for (q=p;*q;q++)
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dtrace_debug__putc(*q);
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}
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break;
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case 'd':
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case 'i':
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base = 10;
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sign = 1;
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goto handle_sign;
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case 'h':
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if (hflag) {
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hflag = 0;
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cflag = 1;
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} else
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|
|
hflag = 1;
|
||
|
|
goto reswitch;
|
||
|
|
case 'j':
|
||
|
|
jflag = 1;
|
||
|
|
goto reswitch;
|
||
|
|
case 'l':
|
||
|
|
if (lflag) {
|
||
|
|
lflag = 0;
|
||
|
|
qflag = 1;
|
||
|
|
} else
|
||
|
|
lflag = 1;
|
||
|
|
goto reswitch;
|
||
|
|
case 'n':
|
||
|
|
if (jflag)
|
||
|
|
*(va_arg(ap, intmax_t *)) = retval;
|
||
|
|
else if (qflag)
|
||
|
|
*(va_arg(ap, quad_t *)) = retval;
|
||
|
|
else if (lflag)
|
||
|
|
*(va_arg(ap, long *)) = retval;
|
||
|
|
else if (zflag)
|
||
|
|
*(va_arg(ap, size_t *)) = retval;
|
||
|
|
else if (hflag)
|
||
|
|
*(va_arg(ap, short *)) = retval;
|
||
|
|
else if (cflag)
|
||
|
|
*(va_arg(ap, char *)) = retval;
|
||
|
|
else
|
||
|
|
*(va_arg(ap, int *)) = retval;
|
||
|
|
break;
|
||
|
|
case 'o':
|
||
|
|
base = 8;
|
||
|
|
goto handle_nosign;
|
||
|
|
case 'p':
|
||
|
|
base = 16;
|
||
|
|
sharpflag = (width == 0);
|
||
|
|
sign = 0;
|
||
|
|
num = (uintptr_t)va_arg(ap, void *);
|
||
|
|
goto number;
|
||
|
|
case 'q':
|
||
|
|
qflag = 1;
|
||
|
|
goto reswitch;
|
||
|
|
case 'r':
|
||
|
|
base = radix;
|
||
|
|
if (sign)
|
||
|
|
goto handle_sign;
|
||
|
|
goto handle_nosign;
|
||
|
|
case 's':
|
||
|
|
p = va_arg(ap, char *);
|
||
|
|
if (p == NULL)
|
||
|
|
p = "(null)";
|
||
|
|
if (!dot)
|
||
|
|
n = strlen (p);
|
||
|
|
else
|
||
|
|
for (n = 0; n < dwidth && p[n]; n++)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
width -= n;
|
||
|
|
|
||
|
|
if (!ladjust && width > 0)
|
||
|
|
while (width--)
|
||
|
|
dtrace_debug__putc(padc);
|
||
|
|
while (n--)
|
||
|
|
dtrace_debug__putc(*p++);
|
||
|
|
if (ladjust && width > 0)
|
||
|
|
while (width--)
|
||
|
|
dtrace_debug__putc(padc);
|
||
|
|
break;
|
||
|
|
case 't':
|
||
|
|
tflag = 1;
|
||
|
|
goto reswitch;
|
||
|
|
case 'u':
|
||
|
|
base = 10;
|
||
|
|
goto handle_nosign;
|
||
|
|
case 'X':
|
||
|
|
upper = 1;
|
||
|
|
case 'x':
|
||
|
|
base = 16;
|
||
|
|
goto handle_nosign;
|
||
|
|
case 'y':
|
||
|
|
base = 16;
|
||
|
|
sign = 1;
|
||
|
|
goto handle_sign;
|
||
|
|
case 'z':
|
||
|
|
zflag = 1;
|
||
|
|
goto reswitch;
|
||
|
|
handle_nosign:
|
||
|
|
sign = 0;
|
||
|
|
if (jflag)
|
||
|
|
num = va_arg(ap, uintmax_t);
|
||
|
|
else if (qflag)
|
||
|
|
num = va_arg(ap, u_quad_t);
|
||
|
|
else if (tflag)
|
||
|
|
num = va_arg(ap, ptrdiff_t);
|
||
|
|
else if (lflag)
|
||
|
|
num = va_arg(ap, u_long);
|
||
|
|
else if (zflag)
|
||
|
|
num = va_arg(ap, size_t);
|
||
|
|
else if (hflag)
|
||
|
|
num = (u_short)va_arg(ap, int);
|
||
|
|
else if (cflag)
|
||
|
|
num = (u_char)va_arg(ap, int);
|
||
|
|
else
|
||
|
|
num = va_arg(ap, u_int);
|
||
|
|
goto number;
|
||
|
|
handle_sign:
|
||
|
|
if (jflag)
|
||
|
|
num = va_arg(ap, intmax_t);
|
||
|
|
else if (qflag)
|
||
|
|
num = va_arg(ap, quad_t);
|
||
|
|
else if (tflag)
|
||
|
|
num = va_arg(ap, ptrdiff_t);
|
||
|
|
else if (lflag)
|
||
|
|
num = va_arg(ap, long);
|
||
|
|
else if (zflag)
|
||
|
|
num = va_arg(ap, size_t);
|
||
|
|
else if (hflag)
|
||
|
|
num = (short)va_arg(ap, int);
|
||
|
|
else if (cflag)
|
||
|
|
num = (char)va_arg(ap, int);
|
||
|
|
else
|
||
|
|
num = va_arg(ap, int);
|
||
|
|
number:
|
||
|
|
if (sign && (intmax_t)num < 0) {
|
||
|
|
neg = 1;
|
||
|
|
num = -(intmax_t)num;
|
||
|
|
}
|
||
|
|
p = dtrace_debug_ksprintn(nbuf, num, base, &tmp, upper);
|
||
|
|
if (sharpflag && num != 0) {
|
||
|
|
if (base == 8)
|
||
|
|
tmp++;
|
||
|
|
else if (base == 16)
|
||
|
|
tmp += 2;
|
||
|
|
}
|
||
|
|
if (neg)
|
||
|
|
tmp++;
|
||
|
|
|
||
|
|
if (!ladjust && padc != '0' && width
|
||
|
|
&& (width -= tmp) > 0)
|
||
|
|
while (width--)
|
||
|
|
dtrace_debug__putc(padc);
|
||
|
|
if (neg)
|
||
|
|
dtrace_debug__putc('-');
|
||
|
|
if (sharpflag && num != 0) {
|
||
|
|
if (base == 8) {
|
||
|
|
dtrace_debug__putc('0');
|
||
|
|
} else if (base == 16) {
|
||
|
|
dtrace_debug__putc('0');
|
||
|
|
dtrace_debug__putc('x');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!ladjust && width && (width -= tmp) > 0)
|
||
|
|
while (width--)
|
||
|
|
dtrace_debug__putc(padc);
|
||
|
|
|
||
|
|
while (*p)
|
||
|
|
dtrace_debug__putc(*p--);
|
||
|
|
|
||
|
|
if (ladjust && width && (width -= tmp) > 0)
|
||
|
|
while (width--)
|
||
|
|
dtrace_debug__putc(padc);
|
||
|
|
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
while (percent < fmt)
|
||
|
|
dtrace_debug__putc(*percent++);
|
||
|
|
/*
|
||
|
|
* Since we ignore an formatting argument it is no
|
||
|
|
* longer safe to obey the remaining formatting
|
||
|
|
* arguments as the arguments will no longer match
|
||
|
|
* the format specs.
|
||
|
|
*/
|
||
|
|
stop = 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
dtrace_debug__putc('\0');
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
dtrace_debug_printf(const char *fmt, ...)
|
||
|
|
{
|
||
|
|
va_list ap;
|
||
|
|
|
||
|
|
dtrace_debug_lock(curcpu);
|
||
|
|
|
||
|
|
va_start(ap, fmt);
|
||
|
|
|
||
|
|
dtrace_debug_vprintf(fmt, ap);
|
||
|
|
|
||
|
|
va_end(ap);
|
||
|
|
|
||
|
|
dtrace_debug_unlock(curcpu);
|
||
|
|
}
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
#define dtrace_debug_output()
|
||
|
|
#define dtrace_debug_puts(_s)
|
||
|
|
#define dtrace_debug_printf(fmt, ...)
|
||
|
|
|
||
|
|
#endif
|