/*-
* Copyright (c) 1986, 1988, 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* @(#)subr_prf.c 8.4 (Berkeley) 5/4/95
*/
const char *panicstr; /* arg to first call to panic (used as a flag
to indicate that panic has already been called). */
struct cpu_info *paniccpu; /* cpu that first panicked */
long panicstart, panicend; /* position in the msgbuf of the start and
end of the formatted panicstr. */
int doing_shutdown; /* set to indicate shutdown in progress */
#ifndef DUMP_ON_PANIC
#define DUMP_ON_PANIC 1
#endif
int dumponpanic = DUMP_ON_PANIC;
/*
* v_putc: routine to putc on virtual console
*
* the v_putc pointer can be used to redirect the console cnputc elsewhere
* [e.g. to a "virtual console"].
*/
/*
* Locking is inited fairly early in MI bootstrap. Before that
* prints are done unlocked. But that doesn't really matter,
* since nothing can preempt us before interrupts are enabled.
*/
void
kprintf_init(void)
{
if (__predict_true(kprintf_inited))
mutex_enter(&kprintf_mtx);
}
void
kprintf_unlock(void)
{
if (__predict_true(kprintf_inited)) {
/* assert kprintf wasn't somehow inited while we were in */
KASSERT(mutex_owned(&kprintf_mtx));
mutex_exit(&kprintf_mtx);
}
}
/*
* twiddle: spin a little propellor on the console.
*/
/*
* panic: handle an unresolvable fatal error
*
* prints "panic: <message>" and reboots. if called twice (i.e. recursive
* call) we avoid trying to dump and just reboot (to avoid recursive panics).
*/
if (lwp0.l_cpu && curlwp) {
/*
* Disable preemption. If already panicking on another CPU, sit
* here and spin until the system is rebooted. Allow the CPU that
* first panicked to panic again.
*/
kpreempt_disable();
ci = curcpu();
oci = atomic_cas_ptr((void *)&paniccpu, NULL, ci);
if (oci != NULL && oci != ci) {
/* Give interrupts a chance to try and prevent deadlock. */
for (;;) {
#ifndef _RUMPKERNEL /* XXXpooka: temporary build fix, see kern/40505 */
DELAY(10);
#endif /* _RUMPKERNEL */
}
}
/*
* Convert the current thread to a bound thread and prevent all
* CPUs from scheduling unbound jobs. Do so without taking any
* locks.
*/
curlwp->l_pflag |= LP_BOUND;
for (CPU_INFO_FOREACH(cii, ci)) {
ci->ci_schedstate.spc_flags |= SPCF_OFFLINE;
}
}
bootopt = RB_AUTOBOOT | RB_NOSYNC;
if (!doing_shutdown) {
if (dumponpanic)
bootopt |= RB_DUMP;
} else
printf("Skipping crash dump on recursive panic\n");
doing_shutdown = 1;
if (logenabled(msgbufp))
panicstart = msgbufp->msg_bufx;
kprintf_lock();
kprintf_internal("panic: ", TOLOG|TOCONS, NULL, NULL);
if (panicstr == NULL) {
/* first time in panic - store fmt first for precaution */
panicstr = fmt;
for (n = prec, fsec = ts.tv_nsec; n < 8; n++)
fsec /= 10;
if (n < 9)
fsec = (fsec / 10) + ((fsec % 10) >= 5);
n = snprintf(buf, sizeof(buf), "[% 4jd.%.*ld] ",
(intmax_t)ts.tv_sec, prec, fsec);
for (int i = 0; i < n; i++)
putone(buf[i], flags, tp);
}
#endif
/*
* putchar: print a single character on console or user terminal.
*
* => if console, then the last MSGBUFS chars are saved in msgbuf
* for inspection later (e.g. dmesg/syslog)
* => we must already be in the mutex!
*/
static void
putchar(int c, int flags, struct tty *tp)
{
if (c & KLOG_PRI) {
putlogpri(c & ~KLOG_PRI);
return;
}
/*
* tablefull: warn that a system table is full
*/
void
tablefull(const char *tab, const char *hint)
{
if (hint)
log(LOG_ERR, "%s: table is full - %s\n", tab, hint);
else
log(LOG_ERR, "%s: table is full\n", tab);
}
/*
* uprintf: print to the controlling tty of the current process
*
* => we may block if the tty queue is full
* => no message is printed if the queue doesn't clear in a reasonable
* time
*/
if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) {
/* No mutex needed; going to process TTY. */
va_start(ap, fmt);
kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap);
va_end(ap);
}
}
/*
* tprintf functions: used to send messages to a specific process
*
* usage:
* get a tpr_t handle on a process "p" by using "tprintf_open(p)"
* use the handle when calling "tprintf"
* when done, do a "tprintf_close" to drop the handle
*/
/*
* tprintf_open: get a tprintf handle on a process "p"
*
* => returns NULL if process can't be printed to
*/
/*
* tprintf: given tprintf handle to a process [obtained with tprintf_open],
* send a message to the controlling tty for that process.
*
* => also sends message to /dev/klog
*/
void
tprintf(tpr_t tpr, const char *fmt, ...)
{
struct session *sess = (struct session *)tpr;
struct tty *tp = NULL;
int flags = TOLOG;
va_list ap;
/*
* ttyprintf: send a message to a specific tty
*
* => should be used only by tty driver or anything that knows the
* underlying tty will not be revoked(2)'d away. [otherwise,
* use tprintf]
*/
void
ttyprintf(struct tty *tp, const char *fmt, ...)
{
va_list ap;
/* No mutex needed; going to process TTY. */
va_start(ap, fmt);
kprintf(fmt, TOTTY, tp, NULL, ap);
va_end(ap);
}
#ifdef DDB
/*
* db_printf: printf for DDB (via db_putchar)
*/
/*
* Device autoconfiguration printf routines. These change their
* behavior based on the AB_* flags in boothowto. If AB_SILENT
* is set, messages never go to the console (but they still always
* go to the log). AB_VERBOSE overrides AB_SILENT.
*/
/*
* aprint_normal: Send to console unless AB_QUIET. Always goes
* to the log.
*/
static void
aprint_normal_internal(const char *prefix, const char *fmt, va_list ap)
{
int flags = TOLOG;
/*
* aprint_error: Send to console unless AB_QUIET. Always goes
* to the log. Also counts the number of times called so other
* parts of the kernel can report the number of errors during a
* given phase of system startup.
*/
static int aprint_error_count;
/*
* aprint_naive: Send to console only if AB_QUIET. Never goes
* to the log.
*/
static void
aprint_naive_internal(const char *prefix, const char *fmt, va_list ap)
{
if ((boothowto & (AB_QUIET|AB_SILENT|AB_VERBOSE)) != AB_QUIET)
return;
/*
* vsnprintf: print a message to a buffer [already have va_list]
*/
int
vsnprintf(char *bf, size_t size, const char *fmt, va_list ap)
{
int retval;
char *p;
/*
* kprintf: scaled down version of printf(3).
*
* this version based on vfprintf() from libc which was derived from
* software contributed to Berkeley by Chris Torek.
*
* NOTE: The kprintf mutex must be held if we're going TOBUF or TOCONS!
*/
/*
* macros for converting digits to letters and vice versa
*/
#define to_digit(c) ((c) - '0')
#define is_digit(c) ((unsigned)to_digit(c) <= 9)
#define to_char(n) ((n) + '0')
/*
* flags used during conversion.
*/
#define ALT 0x001 /* alternate form */
#define HEXPREFIX 0x002 /* add 0x or 0X prefix */
#define LADJUST 0x004 /* left adjustment */
#define LONGDBL 0x008 /* long double; unimplemented */
#define LONGINT 0x010 /* long integer */
#define QUADINT 0x020 /* quad integer */
#define SHORTINT 0x040 /* short integer */
#define MAXINT 0x080 /* intmax_t */
#define PTRINT 0x100 /* intptr_t */
#define SIZEINT 0x200 /* size_t */
#define ZEROPAD 0x400 /* zero (as opposed to blank) pad */
#define FPT 0x800 /* Floating point number */
/*
* Guts of kernel printf. Note, we already expect to be in a mutex!
*/
int
kprintf(const char *fmt0, int oflags, void *vp, char *sbuf, va_list ap)
{
const char *fmt; /* format string */
int ch; /* character from fmt */
int n; /* handy integer (short term usage) */
char *cp; /* handy char pointer (short term usage) */
int flags; /* flags as above */
int ret; /* return value accumulator */
int width; /* width from format (%8d), or 0 */
int prec; /* precision from format (%.3d), or -1 */
char sign; /* sign prefix (' ', '+', '-', or \0) */
u_quad_t _uquad; /* integer arguments %[diouxX] */
enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */
int dprec; /* a copy of prec if [diouxX], 0 otherwise */
int realsz; /* field size expanded by dprec */
int size; /* size of converted field or string */
const char *xdigs; /* digits for [xX] conversion */
char bf[KPRINTF_BUFSIZE]; /* space for %c, %[diouxX] */
char *tailp; /* tail pointer for snprintf */
rflag: ch = *fmt++;
reswitch: switch (ch) {
case ' ':
/*
* ``If the space and + flags both appear, the space
* flag will be ignored.''
* -- ANSI X3J11
*/
if (!sign)
sign = ' ';
goto rflag;
case '#':
flags |= ALT;
goto rflag;
case '*':
/*
* ``A negative field width argument is taken as a
* - flag followed by a positive field width.''
* -- ANSI X3J11
* They don't exclude field widths read from args.
*/
if ((width = va_arg(ap, int)) >= 0)
goto rflag;
width = -width;
/* FALLTHROUGH */
case '-':
flags |= LADJUST;
goto rflag;
case '+':
sign = '+';
goto rflag;
case '.':
if ((ch = *fmt++) == '*') {
n = va_arg(ap, int);
prec = n < 0 ? -1 : n;
goto rflag;
}
n = 0;
while (is_digit(ch)) {
n = 10 * n + to_digit(ch);
ch = *fmt++;
}
prec = n < 0 ? -1 : n;
goto reswitch;
case '0':
/*
* ``Note that 0 is taken as a flag, not as the
* beginning of a field width.''
* -- ANSI X3J11
*/
flags |= ZEROPAD;
goto rflag;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
n = 0;
do {
n = 10 * n + to_digit(ch);
ch = *fmt++;
} while (is_digit(ch));
width = n;
goto reswitch;
case 'h':
flags |= SHORTINT;
goto rflag;
case 'j':
flags |= MAXINT;
goto rflag;
case 'l':
if (*fmt == 'l') {
fmt++;
flags |= QUADINT;
} else {
flags |= LONGINT;
}
goto rflag;
case 'q':
flags |= QUADINT;
goto rflag;
case 't':
flags |= PTRINT;
goto rflag;
case 'z':
flags |= SIZEINT;
goto rflag;
case 'c':
*(cp = bf) = va_arg(ap, int);
size = 1;
sign = '\0';
break;
case 'D':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'd':
case 'i':
_uquad = SARG();
if ((quad_t)_uquad < 0) {
_uquad = -_uquad;
sign = '-';
}
base = DEC;
goto number;
case 'n':
/* no %n support in the kernel, consume and skip */
if (flags & MAXINT)
(void)va_arg(ap, intmax_t *);
else if (flags & PTRINT)
(void)va_arg(ap, intptr_t *);
else if (flags & SIZEINT)
(void)va_arg(ap, ssize_t *);
else if (flags & QUADINT)
(void)va_arg(ap, quad_t *);
else if (flags & LONGINT)
(void)va_arg(ap, long *);
else if (flags & SHORTINT)
(void)va_arg(ap, short *);
else
(void)va_arg(ap, int *);
continue; /* no output */
case 'O':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'o':
_uquad = UARG();
base = OCT;
goto nosign;
case 'p':
/*
* ``The argument shall be a pointer to void. The
* value of the pointer is converted to a sequence
* of printable characters, in an implementation-
* defined manner.''
* -- ANSI X3J11
*/
/* NOSTRICT */
_uquad = (u_long)va_arg(ap, void *);
base = HEX;
xdigs = hexdigits;
flags |= HEXPREFIX;
ch = 'x';
goto nosign;
case 's':
if ((cp = va_arg(ap, char *)) == NULL)
/*XXXUNCONST*/
cp = __UNCONST("(null)");
if (prec >= 0) {
/*
* can't use strlen; can only look for the
* NUL in the first `prec' characters, and
* strlen() will go further.
*/
char *p = memchr(cp, 0, prec);
if (p != NULL) {
size = p - cp;
if (size > prec)
size = prec;
} else
size = prec;
} else
size = strlen(cp);
sign = '\0';
break;
case 'U':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'u':
_uquad = UARG();
base = DEC;
goto nosign;
case 'X':
xdigs = HEXDIGITS;
goto hex;
case 'x':
xdigs = hexdigits;
hex: _uquad = UARG();
base = HEX;
/* leading 0x/X only if non-zero */
if (flags & ALT && _uquad != 0)
flags |= HEXPREFIX;
/* unsigned conversions */
nosign: sign = '\0';
/*
* ``... diouXx conversions ... if a precision is
* specified, the 0 flag will be ignored.''
* -- ANSI X3J11
*/
number: if ((dprec = prec) >= 0)
flags &= ~ZEROPAD;
/*
* ``The result of converting a zero value with an
* explicit precision of zero is no characters.''
* -- ANSI X3J11
*/
cp = bf + KPRINTF_BUFSIZE;
if (_uquad != 0 || prec != 0) {
/*
* Unsigned mod is hard, and unsigned mod
* by a constant is easier than that by
* a variable; hence this switch.
*/
switch (base) {
case OCT:
do {
*--cp = to_char(_uquad & 7);
_uquad >>= 3;
} while (_uquad);
/* handle octal leading 0 */
if (flags & ALT && *cp != '0')
*--cp = '0';
break;
case DEC:
/* many numbers are 1 digit */
while (_uquad >= 10) {
*--cp = to_char(_uquad % 10);
_uquad /= 10;
}
*--cp = to_char(_uquad);
break;
case HEX:
do {
*--cp = xdigs[_uquad & 15];
_uquad >>= 4;
} while (_uquad);
break;
default:
/*XXXUNCONST*/
cp = __UNCONST("bug in kprintf: bad base");
size = strlen(cp);
goto skipsize;
}
}
size = bf + KPRINTF_BUFSIZE - cp;
skipsize:
break;
default: /* "%?" prints ?, unless ? is NUL */
if (ch == '\0')
goto done;
/* pretend it was %c with argument ch */
cp = bf;
*cp = ch;
size = 1;
sign = '\0';
break;
}
/*
* All reasonable formats wind up here. At this point, `cp'
* points to a string which (if not flags&LADJUST) should be
* padded out to `width' places. If flags&ZEROPAD, it should
* first be prefixed by any sign or other prefix; otherwise,
* it should be blank padded before the prefix is emitted.
* After any left-hand padding and prefixing, emit zeroes
* required by a decimal [diouxX] precision, then print the
* string proper, then emit zeroes required by any leftover
* floating precision; finally, if LADJUST, pad with blanks.
*
* Compute actual size, so we know how much to pad.
* size excludes decimal prec; realsz includes it.
*/
realsz = dprec > size ? dprec : size;
if (sign)
realsz++;
else if (flags & HEXPREFIX)
realsz+= 2;
/* adjust ret */
ret += width > realsz ? width : realsz;
/* right-adjusting blank padding */
if ((flags & (LADJUST|ZEROPAD)) == 0) {
n = width - realsz;
while (n-- > 0)
KPRINTF_PUTCHAR(' ');
}
/* prefix */
if (sign) {
KPRINTF_PUTCHAR(sign);
} else if (flags & HEXPREFIX) {
KPRINTF_PUTCHAR('0');
KPRINTF_PUTCHAR(ch);
}
/* right-adjusting zero padding */
if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) {
n = width - realsz;
while (n-- > 0)
KPRINTF_PUTCHAR('0');
}
/* leading zeroes from decimal precision */
n = dprec - size;
while (n-- > 0)
KPRINTF_PUTCHAR('0');
/* the string or number proper */
for (; size--; cp++)
KPRINTF_PUTCHAR(*cp);
/* left-adjusting padding (always blank) */
if (flags & LADJUST) {
n = width - realsz;
while (n-- > 0)
KPRINTF_PUTCHAR(' ');
}
}
