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/*-
* Copyright (C) 2008 John Birrell <jb@freebsd.org>.
* 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(s), this list of conditions and the following disclaimer as
* the first lines of this file unmodified other than the possible
* addition of one or more copyright notices.
* 2. Redistributions in binary form must reproduce the above copyright
* notice(s), 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 COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) 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.
*
* $FreeBSD: release/9.1.0/sys/cddl/dev/dtrace/dtrace_debug.c 209059 2010-06-11 18:46:34Z jhb $
*
*/
#ifdef DEBUG
#if defined(__amd64__)
static __inline int
dtrace_cmpset_long(volatile u_long *dst, u_long exp, u_long src)
{
u_char res;
__asm __volatile(
" lock ; "
" cmpxchgq %2,%1 ; "
" sete %0 ; "
"1: "
"# dtrace_cmpset_long"
: "=a" (res), /* 0 */
"=m" (*dst) /* 1 */
: "r" (src), /* 2 */
"a" (exp), /* 3 */
"m" (*dst) /* 4 */
: "memory");
return (res);
}
#elif defined(__i386__)
static __inline int
dtrace_cmpset_long(volatile u_long *dst, u_long exp, u_long src)
{
u_char res;
__asm __volatile(
" lock ; "
" cmpxchgl %2,%1 ; "
" sete %0 ; "
"1: "
"# dtrace_cmpset_long"
: "=a" (res), /* 0 */
"=m" (*dst) /* 1 */
: "r" (src), /* 2 */
"a" (exp), /* 3 */
"m" (*dst) /* 4 */
: "memory");
return (res);
}
#endif
#define DTRACE_DEBUG_BUFR_SIZE (32 * 1024)
struct dtrace_debug_data {
char bufr[DTRACE_DEBUG_BUFR_SIZE];
char *first;
char *last;
char *next;
} dtrace_debug_data[MAXCPU];
static char dtrace_debug_bufr[DTRACE_DEBUG_BUFR_SIZE];
static volatile u_long dtrace_debug_flag[MAXCPU];
static void
dtrace_debug_lock(int cpu)
{
while (dtrace_cmpset_long(&dtrace_debug_flag[cpu], 0, 1) == 0)
/* Loop until the lock is obtained. */
;
}
static void
dtrace_debug_unlock(int cpu)
{
dtrace_debug_flag[cpu] = 0;
}
static void
dtrace_debug_init(void *dummy)
{
int i;
struct dtrace_debug_data *d;
CPU_FOREACH(i) {
d = &dtrace_debug_data[i];
if (d->first == NULL) {
d->first = d->bufr;
d->next = d->bufr;
d->last = d->bufr + DTRACE_DEBUG_BUFR_SIZE - 1;
*(d->last) = '\0';
}
}
}
SYSINIT(dtrace_debug_init, SI_SUB_KDTRACE, SI_ORDER_ANY, dtrace_debug_init, NULL);
SYSINIT(dtrace_debug_smpinit, SI_SUB_SMP, SI_ORDER_ANY, dtrace_debug_init, NULL);
static void
dtrace_debug_output(void)
{
char *p;
int i;
struct dtrace_debug_data *d;
uintptr_t count;
CPU_FOREACH(i) {
dtrace_debug_lock(i);
d = &dtrace_debug_data[i];
count = 0;
if (d->first < d->next) {
char *p1 = dtrace_debug_bufr;
count = (uintptr_t) d->next - (uintptr_t) d->first;
for (p = d->first; p < d->next; p++)
*p1++ = *p;
} else if (d->next > d->first) {
char *p1 = dtrace_debug_bufr;
count = (uintptr_t) d->last - (uintptr_t) d->first;
for (p = d->first; p < d->last; p++)
*p1++ = *p;
count += (uintptr_t) d->next - (uintptr_t) d->bufr;
for (p = d->bufr; p < d->next; p++)
*p1++ = *p;
}
d->first = d->bufr;
d->next = d->bufr;
dtrace_debug_unlock(i);
if (count > 0) {
char *last = dtrace_debug_bufr + count;
p = dtrace_debug_bufr;
while (p < last) {
if (*p == '\0') {
p++;
continue;
}
printf("%s", p);
p += strlen(p);
}
}
}
}
/*
* Functions below here are called from the probe context, so they can't call
* _any_ functions outside the dtrace module without running foul of the function
* boundary trace provider (fbt). The purpose of these functions is limited to
* buffering debug strings for output when the probe completes on the current CPU.
*/
static __inline void
dtrace_debug__putc(char c)
{
struct dtrace_debug_data *d = &dtrace_debug_data[curcpu];
*d->next++ = c;
if (d->next == d->last)
d->next = d->bufr;
*(d->next) = '\0';
if (d->next == d->first)
d->first++;
if (d->first == d->last)
d->first = d->bufr;
}
static void __used
dtrace_debug_putc(char c)
{
dtrace_debug_lock(curcpu);
dtrace_debug__putc(c);
dtrace_debug_unlock(curcpu);
}
static void __used
dtrace_debug_puts(const char *s)
{
dtrace_debug_lock(curcpu);
while (*s != '\0')
dtrace_debug__putc(*s++);
dtrace_debug__putc('\0');
dtrace_debug_unlock(curcpu);
}
/*
* Snaffled from sys/kern/subr_prf.c
*
* Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
* order; return an optional length and a pointer to the last character
* written in the buffer (i.e., the first character of the string).
* The buffer pointed to by `nbuf' must have length >= MAXNBUF.
*/
static char *
dtrace_debug_ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
{
char *p, c;
p = nbuf;
*p = '\0';
do {
c = hex2ascii(num % base);
*++p = upper ? toupper(c) : c;
} while (num /= base);
if (lenp)
*lenp = p - nbuf;
return (p);
}
#define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
static void
dtrace_debug_vprintf(const char *fmt, va_list ap)
{
char nbuf[MAXNBUF];
const char *p, *percent, *q;
u_char *up;
int ch, n;
uintmax_t num;
int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
int cflag, hflag, jflag, tflag, zflag;
int dwidth, upper;
int radix = 10;
char padc;
int stop = 0, retval = 0;
num = 0;
if (fmt == NULL)
fmt = "(fmt null)\n";
for (;;) {
padc = ' ';
width = 0;
while ((ch = (u_char)*fmt++) != '%' || stop) {
if (ch == '\0') {
dtrace_debug__putc('\0');
return;
}
dtrace_debug__putc(ch);
}
percent = fmt - 1;
qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
sign = 0; dot = 0; dwidth = 0; upper = 0;
cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
reswitch: switch (ch = (u_char)*fmt++) {
case '.':
dot = 1;
goto reswitch;
case '#':
sharpflag = 1;
goto reswitch;
case '+':
sign = 1;
goto reswitch;
case '-':
ladjust = 1;
goto reswitch;
case '%':
dtrace_debug__putc(ch);
break;
case '*':
if (!dot) {
width = va_arg(ap, int);
if (width < 0) {
ladjust = !ladjust;
width = -width;
}
} else {
dwidth = va_arg(ap, int);
}
goto reswitch;
case '0':
if (!dot) {
padc = '0';
goto reswitch;
}
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
for (n = 0;; ++fmt) {
n = n * 10 + ch - '0';
ch = *fmt;
if (ch < '0' || ch > '9')
break;
}
if (dot)
dwidth = n;
else
width = n;
goto reswitch;
case 'b':
num = (u_int)va_arg(ap, int);
p = va_arg(ap, char *);
for (q = dtrace_debug_ksprintn(nbuf, num, *p++, NULL, 0); *q;)
dtrace_debug__putc(*q--);
if (num == 0)
break;
for (tmp = 0; *p;) {
n = *p++;
if (num & (1 << (n - 1))) {
dtrace_debug__putc(tmp ? ',' : '<');
for (; (n = *p) > ' '; ++p)
dtrace_debug__putc(n);
tmp = 1;
} else
for (; *p > ' '; ++p)
continue;
}
if (tmp)
dtrace_debug__putc('>');
break;
case 'c':
dtrace_debug__putc(va_arg(ap, int));
break;
case 'D':
up = va_arg(ap, u_char *);
p = va_arg(ap, char *);
if (!width)
width = 16;
while(width--) {
dtrace_debug__putc(hex2ascii(*up >> 4));
dtrace_debug__putc(hex2ascii(*up & 0x0f));
up++;
if (width)
for (q=p;*q;q++)
dtrace_debug__putc(*q);
}
break;
case 'd':
case 'i':
base = 10;
sign = 1;
goto handle_sign;
case 'h':
if (hflag) {
hflag = 0;
cflag = 1;
} else
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