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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <stddef.h>
#include <stdlib.h>
#include <strings.h>
#include <errno.h>
#include <unistd.h>
#include <assert.h>
#if defined(sun)
#include <alloca.h>
#endif
#include <dt_impl.h>
#include <dt_program.h>
static const char _dt_errprog[] =
"dtrace:::ERROR"
"{"
" trace(arg1);"
" trace(arg2);"
" trace(arg3);"
" trace(arg4);"
" trace(arg5);"
"}";
int
dtrace_handle_err(dtrace_hdl_t *dtp, dtrace_handle_err_f *hdlr, void *arg)
{
dtrace_prog_t *pgp = NULL;
dt_stmt_t *stp;
dtrace_ecbdesc_t *edp;
/*
* We don't currently support multiple error handlers.
*/
if (dtp->dt_errhdlr != NULL)
return (dt_set_errno(dtp, EALREADY));
/*
* If the DTRACEOPT_GRABANON is enabled, the anonymous enabling will
* already have a dtrace:::ERROR probe enabled; save 'hdlr' and 'arg'
* but do not bother compiling and enabling _dt_errprog.
*/
if (dtp->dt_options[DTRACEOPT_GRABANON] != DTRACEOPT_UNSET)
goto out;
if ((pgp = dtrace_program_strcompile(dtp, _dt_errprog,
DTRACE_PROBESPEC_NAME, DTRACE_C_ZDEFS, 0, NULL)) == NULL)
return (dt_set_errno(dtp, dtrace_errno(dtp)));
stp = dt_list_next(&pgp->dp_stmts);
assert(stp != NULL);
edp = stp->ds_desc->dtsd_ecbdesc;
assert(edp != NULL);
edp->dted_uarg = DT_ECB_ERROR;
out:
dtp->dt_errhdlr = hdlr;
dtp->dt_errarg = arg;
dtp->dt_errprog = pgp;
return (0);
}
int
dtrace_handle_drop(dtrace_hdl_t *dtp, dtrace_handle_drop_f *hdlr, void *arg)
{
if (dtp->dt_drophdlr != NULL)
return (dt_set_errno(dtp, EALREADY));
dtp->dt_drophdlr = hdlr;
dtp->dt_droparg = arg;
return (0);
}
int
dtrace_handle_proc(dtrace_hdl_t *dtp, dtrace_handle_proc_f *hdlr, void *arg)
{
if (dtp->dt_prochdlr != NULL)
return (dt_set_errno(dtp, EALREADY));
dtp->dt_prochdlr = hdlr;
dtp->dt_procarg = arg;
return (0);
}
int
dtrace_handle_buffered(dtrace_hdl_t *dtp, dtrace_handle_buffered_f *hdlr,
void *arg)
{
if (dtp->dt_bufhdlr != NULL)
return (dt_set_errno(dtp, EALREADY));
if (hdlr == NULL)
return (dt_set_errno(dtp, EINVAL));
dtp->dt_bufhdlr = hdlr;
dtp->dt_bufarg = arg;
return (0);
}
int
dtrace_handle_setopt(dtrace_hdl_t *dtp, dtrace_handle_setopt_f *hdlr,
void *arg)
{
if (hdlr == NULL)
return (dt_set_errno(dtp, EINVAL));
dtp->dt_setopthdlr = hdlr;
dtp->dt_setoptarg = arg;
return (0);
}
#define DT_REC(type, ndx) *((type *)((uintptr_t)data->dtpda_data + \
epd->dtepd_rec[(ndx)].dtrd_offset))
static int
dt_handle_err(dtrace_hdl_t *dtp, dtrace_probedata_t *data)
{
dtrace_eprobedesc_t *epd = data->dtpda_edesc, *errepd;
dtrace_probedesc_t *pd = data->dtpda_pdesc, *errpd;
dtrace_errdata_t err;
dtrace_epid_t epid;
char where[30];
char details[30];
char offinfo[30];
const int slop = 80;
const char *faultstr;
char *str;
int len;
assert(epd->dtepd_uarg == DT_ECB_ERROR);
if (epd->dtepd_nrecs != 5 || strcmp(pd->dtpd_provider, "dtrace") != 0 ||
strcmp(pd->dtpd_name, "ERROR") != 0)
return (dt_set_errno(dtp, EDT_BADERROR));
/*
* This is an error. We have the following items here: EPID,
* faulting action, DIF offset, fault code and faulting address.
*/
epid = (uint32_t)DT_REC(uint64_t, 0);
if (dt_epid_lookup(dtp, epid, &errepd, &errpd) != 0)
return (dt_set_errno(dtp, EDT_BADERROR));
err.dteda_edesc = errepd;
err.dteda_pdesc = errpd;
err.dteda_cpu = data->dtpda_cpu;
err.dteda_action = (int)DT_REC(uint64_t, 1);
err.dteda_offset = (int)DT_REC(uint64_t, 2);
err.dteda_fault = (int)DT_REC(uint64_t, 3);
err.dteda_addr = DT_REC(uint64_t, 4);
faultstr = dtrace_faultstr(dtp, err.dteda_fault);
len = sizeof (where) + sizeof (offinfo) + strlen(faultstr) +
strlen(errpd->dtpd_provider) + strlen(errpd->dtpd_mod) +
strlen(errpd->dtpd_name) + strlen(errpd->dtpd_func) +
slop;
str = (char *)alloca(len);
if (err.dteda_action == 0) {
(void) sprintf(where, "predicate");
} else {
(void) sprintf(where, "action #%d", err.dteda_action);
}
if (err.dteda_offset != -1) {
(void) sprintf(offinfo, " at DIF offset %d", err.dteda_offset);
} else {
offinfo[0] = 0;
}
switch (err.dteda_fault) {
case DTRACEFLT_BADADDR:
case DTRACEFLT_BADALIGN:
case DTRACEFLT_BADSTACK:
(void) sprintf(details, " (0x%llx)",
(u_longlong_t)err.dteda_addr);
break;
default:
details[0] = 0;
}
(void) snprintf(str, len, "error on enabled probe ID %u "
"(ID %u: %s:%s:%s:%s): %s%s in %s%s\n",
epid, errpd->dtpd_id, errpd->dtpd_provider,
errpd->dtpd_mod, errpd->dtpd_func,
errpd->dtpd_name, dtrace_faultstr(dtp, err.dteda_fault),
details, where, offinfo);
err.dteda_msg = str;
if (dtp->dt_errhdlr == NULL)
return (dt_set_errno(dtp, EDT_ERRABORT));
if ((*dtp->dt_errhdlr)(&err, dtp->dt_errarg) == DTRACE_HANDLE_ABORT)
return (dt_set_errno(dtp, EDT_ERRABORT));
return (0);
}
int
dt_handle_liberr(dtrace_hdl_t *dtp, const dtrace_probedata_t *data,
const char *faultstr)
{
dtrace_probedesc_t *errpd = data->dtpda_pdesc;
dtrace_errdata_t err;
const int slop = 80;
char *str;
int len;
err.dteda_edesc = data->dtpda_edesc;
err.dteda_pdesc = errpd;
err.dteda_cpu = data->dtpda_cpu;
err.dteda_action = -1;
err.dteda_offset = -1;
err.dteda_fault = DTRACEFLT_LIBRARY;
err.dteda_addr = 0;
len = strlen(faultstr) +
strlen(errpd->dtpd_provider) + strlen(errpd->dtpd_mod) +
strlen(errpd->dtpd_name) + strlen(errpd->dtpd_func) +
slop;
str = alloca(len);
(void) snprintf(str, len, "error on enabled probe ID %u "
"(ID %u: %s:%s:%s:%s): %s\n",
data->dtpda_edesc->dtepd_epid,
errpd->dtpd_id, errpd->dtpd_provider,
errpd->dtpd_mod, errpd->dtpd_func,
errpd->dtpd_name, faultstr);
err.dteda_msg = str;
if (dtp->dt_errhdlr == NULL)
return (dt_set_errno(dtp, EDT_ERRABORT));
if ((*dtp->dt_errhdlr)(&err, dtp->dt_errarg) == DTRACE_HANDLE_ABORT)
return (dt_set_errno(dtp, EDT_ERRABORT));
return (0);
}
#define DROPTAG(x) x, #x
static const struct {
dtrace_dropkind_t dtdrg_kind;
char *dtdrg_tag;
} _dt_droptags[] = {
{ DROPTAG(DTRACEDROP_PRINCIPAL) },
{ DROPTAG(DTRACEDROP_AGGREGATION) },
{ DROPTAG(DTRACEDROP_DYNAMIC) },
{ DROPTAG(DTRACEDROP_DYNRINSE) },
{ DROPTAG(DTRACEDROP_DYNDIRTY) },
{ DROPTAG(DTRACEDROP_SPEC) },
{ DROPTAG(DTRACEDROP_SPECBUSY) },
{ DROPTAG(DTRACEDROP_SPECUNAVAIL) },
{ DROPTAG(DTRACEDROP_DBLERROR) },
{ DROPTAG(DTRACEDROP_STKSTROVERFLOW) },
{ 0, NULL }
};
static const char *
dt_droptag(dtrace_dropkind_t kind)
{
int i;
for (i = 0; _dt_droptags[i].dtdrg_tag != NULL; i++) {
if (_dt_droptags[i].dtdrg_kind == kind)
return (_dt_droptags[i].dtdrg_tag);
}
return ("DTRACEDROP_UNKNOWN");
}
int
dt_handle_cpudrop(dtrace_hdl_t *dtp, processorid_t cpu,
dtrace_dropkind_t what, uint64_t howmany)
{
dtrace_dropdata_t drop;
char str[80], *s;
int size;
assert(what == DTRACEDROP_PRINCIPAL || what == DTRACEDROP_AGGREGATION);
bzero(&drop, sizeof (drop));
drop.dtdda_handle = dtp;
drop.dtdda_cpu = cpu;
drop.dtdda_kind = what;
drop.dtdda_drops = howmany;
drop.dtdda_msg = str;
if (dtp->dt_droptags) {
(void) snprintf(str, sizeof (str), "[%s] ", dt_droptag(what));
s = &str[strlen(str)];
size = sizeof (str) - (s - str);
} else {
s = str;
size = sizeof (str);
}
(void) snprintf(s, size, "%llu %sdrop%s on CPU %d\n",
howmany, what == DTRACEDROP_PRINCIPAL ? "" : "aggregation ",
howmany > 1 ? "s" : "", cpu);
if (dtp->dt_drophdlr == NULL)
return (dt_set_errno(dtp, EDT_DROPABORT));
if ((*dtp->dt_drophdlr)(&drop, dtp->dt_droparg) == DTRACE_HANDLE_ABORT)
return (dt_set_errno(dtp, EDT_DROPABORT));
return (0);
}
static const struct {
dtrace_dropkind_t dtdrt_kind;
uintptr_t dtdrt_offset;
const char *dtdrt_str;
const char *dtdrt_msg;
} _dt_droptab[] = {
{ DTRACEDROP_DYNAMIC,
offsetof(dtrace_status_t, dtst_dyndrops),
"dynamic variable drop" },
{ DTRACEDROP_DYNRINSE,
offsetof(dtrace_status_t, dtst_dyndrops_rinsing),
"dynamic variable drop", " with non-empty rinsing list" },
{ DTRACEDROP_DYNDIRTY,
offsetof(dtrace_status_t, dtst_dyndrops_dirty),
"dynamic variable drop", " with non-empty dirty list" },
{ DTRACEDROP_SPEC,
offsetof(dtrace_status_t, dtst_specdrops),
"speculative drop" },
{ DTRACEDROP_SPECBUSY,
offsetof(dtrace_status_t, dtst_specdrops_busy),
"failed speculation", " (available buffer(s) still busy)" },
{ DTRACEDROP_SPECUNAVAIL,
offsetof(dtrace_status_t, dtst_specdrops_unavail),
"failed speculation", " (no speculative buffer available)" },
{ DTRACEDROP_STKSTROVERFLOW,
offsetof(dtrace_status_t, dtst_stkstroverflows),
"jstack()/ustack() string table overflow" },
{ DTRACEDROP_DBLERROR,
offsetof(dtrace_status_t, dtst_dblerrors),
"error", " in ERROR probe enabling" },
{ 0, 0, NULL }
};
int
dt_handle_status(dtrace_hdl_t *dtp, dtrace_status_t *old, dtrace_status_t *new)
{
dtrace_dropdata_t drop;
char str[80], *s;
uintptr_t base = (uintptr_t)new, obase = (uintptr_t)old;
int i, size;
bzero(&drop, sizeof (drop));
drop.dtdda_handle = dtp;
drop.dtdda_cpu = DTRACE_CPUALL;
drop.dtdda_msg = str;
/*
* First, check to see if we've been killed -- in which case we abort.
*/
if (new->dtst_killed && !old->dtst_killed)
return (dt_set_errno(dtp, EDT_BRICKED));
for (i = 0; _dt_droptab[i].dtdrt_str != NULL; i++) {
uintptr_t naddr = base + _dt_droptab[i].dtdrt_offset;
uintptr_t oaddr = obase + _dt_droptab[i].dtdrt_offset;
uint64_t nval = *((uint64_t *)naddr);
uint64_t oval = *((uint64_t *)oaddr);
if (nval == oval)
continue;
if (dtp->dt_droptags) {
(void) snprintf(str, sizeof (str), "[%s] ",
dt_droptag(_dt_droptab[i].dtdrt_kind));
s = &str[strlen(str)];
size = sizeof (str) - (s - str);
} else {
s = str;
size = sizeof (str);
}
(void) snprintf(s, size, "%llu %s%s%s\n", nval - oval,
_dt_droptab[i].dtdrt_str, (nval - oval > 1) ? "s" : "",
_dt_droptab[i].dtdrt_msg != NULL ?
_dt_droptab[i].dtdrt_msg : "");
drop.dtdda_kind = _dt_droptab[i].dtdrt_kind;
drop.dtdda_total = nval;
drop.dtdda_drops = nval - oval;
if (dtp->dt_drophdlr == NULL)
return (dt_set_errno(dtp, EDT_DROPABORT));
if ((*dtp->dt_drophdlr)(&drop,
dtp->dt_droparg) == DTRACE_HANDLE_ABORT)
return (dt_set_errno(dtp, EDT_DROPABORT));
}
return (0);
}
int
dt_handle_setopt(dtrace_hdl_t *dtp, dtrace_setoptdata_t *data)
{
void *arg = dtp->dt_setoptarg;
if (dtp->dt_setopthdlr == NULL)
return (0);
if ((*dtp->dt_setopthdlr)(data, arg) == DTRACE_HANDLE_ABORT)
return (dt_set_errno(dtp, EDT_DIRABORT));
return (0);
}
int
dt_handle(dtrace_hdl_t *dtp, dtrace_probedata_t *data)
{
dtrace_eprobedesc_t *epd = data->dtpda_edesc;
int rval;
switch (epd->dtepd_uarg) {
case DT_ECB_ERROR:
rval = dt_handle_err(dtp, data);
break;
default:
return (DTRACE_CONSUME_THIS);
}
if (rval == 0)
return (DTRACE_CONSUME_NEXT);
return (DTRACE_CONSUME_ERROR);
}
|