/*
* 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 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 2013, Joyent, Inc. All rights reserved.
*/
#include <assert.h>
#include <strings.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#if defined(sun)
#include <alloca.h>
#endif
#include <libgen.h>
#include <stddef.h>
#include <sys/sysmacros.h>
#include <dt_impl.h>
#include <dt_program.h>
#include <dt_pid.h>
#include <dt_string.h>
#if !defined(sun)
#include <libproc_compat.h>
#endif
#include <dt_module.h>
typedef struct dt_pid_probe {
dtrace_hdl_t *dpp_dtp;
dt_pcb_t *dpp_pcb;
dt_proc_t *dpp_dpr;
struct ps_prochandle *dpp_pr;
const char *dpp_mod;
char *dpp_func;
const char *dpp_name;
const char *dpp_obj;
uintptr_t dpp_pc;
size_t dpp_size;
Lmid_t dpp_lmid;
uint_t dpp_nmatches;
uint64_t dpp_stret[4];
GElf_Sym dpp_last;
uint_t dpp_last_taken;
} dt_pid_probe_t;
/*
* Compose the lmid and object name into the canonical representation. We
* omit the lmid for the default link map for convenience.
*/
static void
dt_pid_objname(char *buf, size_t len, Lmid_t lmid, const char *obj)
{
#if defined(sun)
if (lmid == LM_ID_BASE)
(void) strncpy(buf, obj, len);
else
(void) snprintf(buf, len, "LM%lx`%s", lmid, obj);
#else
(void) strncpy(buf, obj, len);
#endif
}
static int
dt_pid_error(dtrace_hdl_t *dtp, dt_pcb_t *pcb, dt_proc_t *dpr,
fasttrap_probe_spec_t *ftp, dt_errtag_t tag, const char *fmt, ...)
{
va_list ap;
int len;
if (ftp != NULL)
dt_free(dtp, ftp);
va_start(ap, fmt);
if (pcb == NULL) {
assert(dpr != NULL);
len = vsnprintf(dpr->dpr_errmsg, sizeof (dpr->dpr_errmsg),
fmt, ap);
assert(len >= 2);
if (dpr->dpr_errmsg[len - 2] == '\n')
dpr->dpr_errmsg[len - 2] = '\0';
} else {
dt_set_errmsg(dtp, dt_errtag(tag), pcb->pcb_region,
pcb->pcb_filetag, pcb->pcb_fileptr ? yylineno : 0, fmt, ap);
}
va_end(ap);
return (1);
}
static int
dt_pid_per_sym(dt_pid_probe_t *pp, const GElf_Sym *symp, const char *func)
{
dtrace_hdl_t *dtp = pp->dpp_dtp;
dt_pcb_t *pcb = pp->dpp_pcb;
dt_proc_t *dpr = pp->dpp_dpr;
fasttrap_probe_spec_t *ftp;
uint64_t off;
char *end;
uint_t nmatches = 0;
ulong_t sz;
int glob, err;
int isdash = strcmp("-", func) == 0;
pid_t pid;
#if defined(sun)
pid = Pstatus(pp->dpp_pr)->pr_pid;
#else
pid = proc_getpid(pp->dpp_pr);
#endif
dt_dprintf("creating probe pid%d:%s:%s:%s\n", (int)pid, pp->dpp_obj,
func, pp->dpp_name);
sz = sizeof (fasttrap_probe_spec_t) + (isdash ? 4 :
(symp->st_size - 1) * sizeof (ftp->ftps_offs[0]));
if ((ftp = dt_alloc(dtp, sz)) == NULL) {
dt_dprintf("proc_per_sym: dt_alloc(%lu) failed\n", sz);
return (1); /* errno is set for us */
}
ftp->ftps_pid = pid;
(void) strncpy(ftp->ftps_func, func, sizeof (ftp->ftps_func));
dt_pid_objname(ftp->ftps_mod, sizeof (ftp->ftps_mod), pp->dpp_lmid,
pp->dpp_obj);
if (!isdash && gmatch("return", pp->dpp_name)) {
if (dt_pid_create_return_probe(pp->dpp_pr, dtp, ftp, symp,
pp->dpp_stret) < 0) {
return (dt_pid_error(dtp, pcb, dpr, ftp,
D_PROC_CREATEFAIL, "failed to create return probe "
"for '%s': %s", func,
dtrace_errmsg(dtp, dtrace_errno(dtp))));
}
nmatches++;
}
if (!isdash && gmatch("entry", pp->dpp_name)) {
if (dt_pid_create_entry_probe(pp->dpp_pr, dtp, ftp, symp) < 0) {
return (dt_pid_error(dtp, pcb, dpr, ftp,
D_PROC_CREATEFAIL, "failed to create entry probe "
"for '%s': %s", func,
dtrace_errmsg(dtp, dtrace_errno(dtp))));
}
nmatches++;
}
glob = strisglob(pp->dpp_name);
if (!glob && nmatches == 0) {
off = strtoull(pp->dpp_name, &end, 16);
if (*end != '\0') {
return (dt_pid_error(dtp, pcb, dpr, ftp, D_PROC_NAME,
"'%s' is an invalid probe name", pp->dpp_name));
}
if (off >= symp->st_size) {
return (dt_pid_error(dtp, pcb, dpr, ftp, D_PROC_OFF,
"offset 0x%llx outside of function '%s'",
(u_longlong_t)off, func));
}
err = dt_pid_create_offset_probe(pp->dpp_pr, pp->dpp_dtp, ftp,
symp, off);
if (err == DT_PROC_ERR) {
return (dt_pid_error(dtp, pcb, dpr, ftp,
D_PROC_CREATEFAIL, "failed to create probe at "
"'%s+0x%llx': %s", func, (u_longlong_t)off,
dtrace_errmsg(dtp, dtrace_errno(dtp))));
}
if (err == DT_PROC_ALIGN) {
return (dt_pid_error(dtp, pcb, dpr, ftp, D_PROC_ALIGN,
"offset 0x%llx is not aligned on an instruction",
(u_longlong_t)off));
}
nmatches++;
} else if (glob && !isdash) {
if (dt_pid_create_glob_offset_probes(pp->dpp_pr,
pp->dpp_dtp, ftp, symp, pp->dpp_name) < 0) {
return (dt_pid_error(dtp, pcb, dpr, ftp,
D_PROC_CREATEFAIL,
"failed to create offset probes in '%s': %s", func,
dtrace_errmsg(dtp, dtrace_errno(dtp))));
}
nmatches++;
}
pp->dpp_nmatches += nmatches;
dt_free(dtp, ftp);
return (0);
}
static int
dt_pid_sym_filt(void *arg, const GElf_Sym *symp, const char *func)
{
dt_pid_probe_t *pp = arg;
if (symp->st_shndx == SHN_UNDEF)
return (0);
if (symp->st_size == 0) {
dt_dprintf("st_size of %s is zero\n", func);
return (0);
}
if (pp->dpp_last_taken == 0 ||
symp->st_value != pp->dpp_last.st_value ||
symp->st_size != pp->dpp_last.st_size) {
/*
* Due to 4524008, _init and _fini may have a bloated st_size.
* While this bug has been fixed for a while, old binaries
* may exist that still exhibit this problem. As a result, we
* don't match _init and _fini though we allow users to
* specify them explicitly.
*/
if (strcmp(func, "_init") == 0 || strcmp(func, "_fini") == 0)
return (0);
if ((pp->dpp_last_taken = gmatch(func, pp->dpp_func)) != 0) {
pp->dpp_last = *symp;
return (dt_pid_per_sym(pp, symp, func));
}
}
return (0);
}
static int
dt_pid_per_mod(void *arg, const prmap_t *pmp, const char *obj)
{
dt_pid_probe_t *pp = arg;
dtrace_hdl_t *dtp = pp->dpp_dtp;
dt_pcb_t *pcb = pp->dpp_pcb;
dt_proc_t *dpr = pp->dpp_dpr;
GElf_Sym sym;
if (obj == NULL)
return (0);
#if defined(sun)
(void) Plmid(pp->dpp_pr, pmp->pr_vaddr, &pp->dpp_lmid);
#endif
if ((pp->dpp_obj = strrchr(obj, '/')) == NULL)
pp->dpp_obj = obj;
else
pp->dpp_obj++;
#if defined(sun)
if (Pxlookup_by_name(pp->dpp_pr, pp->dpp_lmid, obj, ".stret1", &sym,
NULL) == 0)
pp->dpp_stret[0] = sym.st_value;
else
pp->dpp_stret[0] = 0;
if (Pxlookup_by_name(pp->dpp_pr, pp->dpp_lmid, obj, ".stret2", &sym,
NULL) == 0)
pp->dpp_stret[1] = sym.st_value;
else
pp->dpp_stret[1] = 0;
if (Pxlookup_by_name(pp->dpp_pr, pp->dpp_lmid, obj, ".stret4", &sym,
NULL) == 0)
pp->dpp_stret[2] = sym.st_value;
else
pp->dpp_stret[2] = 0;
if (Pxlookup_by_name(pp->dpp_pr, pp->dpp_lmid, obj, ".stret8", &sym,
NULL) == 0)
pp->dpp_stret[3] = sym.st_value;
else
pp->dpp_stret[3] = 0;
#else
pp->dpp_stret[0] = 0;
pp->dpp_stret[1] = 0;
pp->dpp_stret[2] = 0;
pp->dpp_stret[3] = 0;
#endif
dt_dprintf("%s stret %llx %llx %llx %llx\n", obj,
(u_longlong_t)pp->dpp_stret[0], (u_longlong_t)pp->dpp_stret[1],
(u_longlong_t)pp->dpp_stret[2], (u_longlong_t)pp->dpp_stret[3]);
/*
* If pp->dpp_func contains any globbing meta-characters, we need
* to iterate over the symbol table and compare each function name
* against the pattern.
*/
if (!strisglob(pp->dpp_func)) {
/*
* If we fail to lookup the symbol, try interpreting the
* function as the special "-" function that indicates that the
* probe name should be interpreted as a absolute virtual
* address. If that fails and we were matching a specific
* function in a specific module, report the error, otherwise
* just fail silently in the hopes that some other object will
* contain the desired symbol.
*/
if (Pxlookup_by_name(pp->dpp_pr, pp->dpp_lmid, obj,
pp->dpp_func, &sym, NULL) != 0) {
if (strcmp("-", pp->dpp_func) == 0) {
sym.st_name = 0;
sym.st_info =
GELF_ST_INFO(STB_LOCAL, STT_FUNC);
sym.st_other = 0;
sym.st_value = 0;
#if defined(sun)
sym.st_size = Pstatus(pp->dpp_pr)->pr_dmodel ==
PR_MODEL_ILP32 ? -1U : -1ULL;
#else
sym.st_size = ~((Elf64_Xword) 0);
#endif
} else if (!strisglob(pp->dpp_mod)) {
return (dt_pid_error(dtp, pcb, dpr, NULL,
D_PROC_FUNC,
"failed to lookup '%s' in module '%s'",
pp->dpp_func, pp->dpp_mod));
} else {
return (0);
}
}
/*
* Only match defined functions of non-zero size.
*/
if (GELF_ST_TYPE(sym.st_info) != STT_FUNC ||
sym.st_shndx == SHN_UNDEF || sym.st_size == 0)
return (0);
/*
* We don't instrument PLTs -- they're dynamically rewritten,
* and, so, inherently dicey to instrument.
*/
#ifdef DOODAD
if (Ppltdest(pp->dpp_pr, sym.st_value) != NULL)
return (0);
#endif
(void) Plookup_by_addr(pp->dpp_pr, sym.st_value, pp->dpp_func,
DTRACE_FUNCNAMELEN, &sym);
return (dt_pid_per_sym(pp, &sym, pp->dpp_func));
} else {
uint_t nmatches = pp->dpp_nmatches;
if (Psymbol_iter_by_addr(pp->dpp_pr, obj, PR_SYMTAB,
BIND_ANY | TYPE_FUNC, dt_pid_sym_filt, pp) == 1)
return (1);
if (nmatches == pp->dpp_nmatches) {
/*
* If we didn't match anything in the PR_SYMTAB, try
* the PR_DYNSYM.
*/
if (Psymbol_iter_by_addr(pp->dpp_pr, obj, PR_DYNSYM,
BIND_ANY | TYPE_FUNC, dt_pid_sym_filt, pp) == 1)
return (1);
}
}
return (0);
}
static int
dt_pid_mod_filt(void *arg, const prmap_t *pmp, const char *obj)
{
char name[DTRACE_MODNAMELEN];
dt_pid_probe_t *pp = arg;
if (gmatch(obj, pp->dpp_mod))
return (dt_pid_per_mod(pp, pmp, obj));
#if defined(sun)
(void) Plmid(pp->dpp_pr, pmp->pr_vaddr, &pp->dpp_lmid);
#else
pp->dpp_lmid = 0;
#endif
if ((pp->dpp_obj = strrchr(obj, '/')) == NULL)
pp->dpp_obj = obj;
else
pp->dpp_obj++;
if (gmatch(pp->dpp_obj, pp->dpp_mod))
return (dt_pid_per_mod(pp, pmp, obj));
#if defined(sun)
(void) Plmid(pp->dpp_pr, pmp->pr_vaddr, &pp->dpp_lmid);
#endif
dt_pid_objname(name, sizeof (name), pp->dpp_lmid, pp->dpp_obj);
if (gmatch(name, pp->dpp_mod))
return (dt_pid_per_mod(pp, pmp, obj));
return (0);
}
static const prmap_t *
dt_pid_fix_mod(dtrace_probedesc_t *pdp, struct ps_prochandle *P)
{
char m[MAXPATHLEN];
Lmid_t lmid = PR_LMID_EVERY;
const char *obj;
const prmap_t *pmp;
/*
* Pick apart the link map from the library name.
*/
if (strchr(pdp->dtpd_mod, '`') != NULL) {
char *end;
if (strncmp(pdp->dtpd_mod, "LM", 2) != 0 ||
!isdigit(pdp->dtpd_mod[2]))
return (NULL);
lmid = strtoul(&pdp->dtpd_mod[2], &end, 16);
obj = end + 1;
if (*end != '`' || strchr(obj, '`') != NULL)
return (NULL);
} else {
obj = pdp->dtpd_mod;
}
if ((pmp = Plmid_to_map(P, lmid, obj)) == NULL)
return (NULL);
(void) Pobjname(P, pmp->pr_vaddr, m, sizeof (m));
if ((obj = strrchr(m, '/')) == NULL)
obj = &m[0];
else
obj++;
#if defined(sun)
(void) Plmid(P, pmp->pr_vaddr, &lmid);
#endif
dt_pid_objname(pdp->dtpd_mod, sizeof (pdp->dtpd_mod), lmid, obj);
return (pmp);
}
static int
dt_pid_create_pid_probes(dtrace_probedesc_t *pdp, dtrace_hdl_t *dtp,
dt_pcb_t *pcb, dt_proc_t *dpr)
{
dt_pid_probe_t pp;
int ret = 0;
pp.dpp_dtp = dtp;
pp.dpp_dpr = dpr;
pp.dpp_pr = dpr->dpr_proc;
pp.dpp_pcb = pcb;
#ifdef DOODAD
/*
* We can only trace dynamically-linked executables (since we've
* hidden some magic in ld.so.1 as well as libc.so.1).
*/
if (Pname_to_map(pp.dpp_pr, PR_OBJ_LDSO) == NULL) {
return (dt_pid_error(dtp, pcb, dpr, NULL, D_PROC_DYN,
"process %s is not a dynamically-linked executable",
&pdp->dtpd_provider[3]));
}
#endif
pp.dpp_mod = pdp->dtpd_mod[0] != '\0' ? pdp->dtpd_mod : "*";
pp.dpp_func = pdp->dtpd_func[0] != '\0' ? pdp->dtpd_func : "*";
pp.dpp_name = pdp->dtpd_name[0] != '\0' ? pdp->dtpd_name : "*";
pp.dpp_last_taken = 0;
if (strcmp(pp.dpp_func, "-") == 0) {
const prmap_t *aout, *pmp;
if (pdp->dtpd_mod[0] == '\0') {
pp.dpp_mod = pdp->dtpd_mod;
(void) strcpy(pdp->dtpd_mod, "a.out");
} else if (strisglob(pp.dpp_mod) ||
(aout = Pname_to_map(pp.dpp_pr, "a.out")) == NULL ||
(pmp = Pname_to_map(pp.dpp_pr, pp.dpp_mod)) == NULL ||
aout->pr_vaddr != pmp->pr_vaddr) {
return (dt_pid_error(dtp, pcb, dpr, NULL, D_PROC_LIB,
"only the a.out module is valid with the "
"'-' function"));
}
if (strisglob(pp.dpp_name)) {
return (dt_pid_error(dtp, pcb, dpr, NULL, D_PROC_NAME,
"only individual addresses may be specified "
"with the '-' function"));
}
}
/*
* If pp.dpp_mod contains any globbing meta-characters, we need
* to iterate over each module and compare its name against the
* pattern. An empty module name is treated as '*'.
*/
if (strisglob(pp.dpp_mod)) {
ret = Pobject_iter(pp.dpp_pr, dt_pid_mod_filt, &pp);
} else {
const prmap_t *pmp;
char *obj;
/*
* If we can't find a matching module, don't sweat it -- either
* we'll fail the enabling because the probes don't exist or
* we'll wait for that module to come along.
*/
if ((pmp = dt_pid_fix_mod(pdp, pp.dpp_pr)) != NULL) {
if ((obj = strchr(pdp->dtpd_mod, '`')) == NULL)
obj = pdp->dtpd_mod;
else
obj++;
ret = dt_pid_per_mod(&pp, pmp, obj);
}
}
return (ret);
}
static int
dt_pid_usdt_mapping(void *data, const prmap_t *pmp, const char *oname)
{
struct ps_prochandle *P = data;
GElf_Sym sym;
prsyminfo_t sip;
dof_helper_t dh;
GElf_Half e_type;
const char *mname;
const char *syms[] = { "___SUNW_dof", "__SUNW_dof" };
int i, fd = -1;
/*
* The symbol ___SUNW_dof is for lazy-loaded DOF sections, and
* __SUNW_dof is for actively-loaded DOF sections. We try to force
* in both types of DOF section since the process may not yet have
* run the code to instantiate these providers.
*/
for (i = 0; i < 2; i++) {
if (Pxlookup_by_name(P, PR_LMID_EVERY, oname, syms[i], &sym,
&sip) != 0) {
continue;
}
if ((mname = strrchr(oname, '/')) == NULL)
mname = oname;
else
mname++;
dt_dprintf("lookup of %s succeeded for %s\n", syms[i], mname);
if (Pread(P, &e_type, sizeof (e_type), pmp->pr_vaddr +
offsetof(Elf64_Ehdr, e_type)) != sizeof (e_type)) {
dt_dprintf("read of ELF header failed");
continue;
}
dh.dofhp_dof = sym.st_value;
dh.dofhp_addr = (e_type == ET_EXEC) ? 0 : pmp->pr_vaddr;
dt_pid_objname(dh.dofhp_mod, sizeof (dh.dofhp_mod),
#if defined(sun)
sip.prs_lmid, mname);
#else
0, mname);
#endif
#if defined(sun)
if (fd == -1 &&
(fd = pr_open(P, "/dev/dtrace/helper", O_RDWR, 0)) < 0) {
dt_dprintf("pr_open of helper device failed: %s\n",
strerror(errno));
return (-1); /* errno is set for us */
}
if (pr_ioctl(P, fd, DTRACEHIOC_ADDDOF, &dh, sizeof (dh)) < 0)
dt_dprintf("DOF was rejected for %s\n", dh.dofhp_mod);
#endif
}
#if defined(sun)
if (fd != -1)
(void) pr_close(P, fd);
#endif
return (0);
}
static int
dt_pid_create_usdt_probes(dtrace_probedesc_t *pdp, dtrace_hdl_t *dtp,
dt_pcb_t *pcb, dt_proc_t *dpr)
{
struct ps_prochandle *P = dpr->dpr_proc;
int ret = 0;
assert(DT_MUTEX_HELD(&dpr->dpr_lock));
#if defined(sun)
(void) Pupdate_maps(P);
if (Pobject_iter(P, dt_pid_usdt_mapping, P) != 0) {
ret = -1;
(void) dt_pid_error(dtp, pcb, dpr, NULL, D_PROC_USDT,
"failed to instantiate probes for pid %d: %s",
#if defined(sun)
(int)Pstatus(P)->pr_pid, strerror(errno));
#else
(int)proc_getpid(P), strerror(errno));
#endif
}
#else
ret = 0;
#endif
/*
* Put the module name in its canonical form.
*/
(void) dt_pid_fix_mod(pdp, P);
return (ret);
}
static pid_t
dt_pid_get_pid(dtrace_probedesc_t *pdp, dtrace_hdl_t *dtp, dt_pcb_t *pcb,
dt_proc_t *dpr)
{
pid_t pid;
char *c, *last = NULL, *end;
for (c = &pdp->dtpd_provider[0]; *c != '\0'; c++) {
if (!isdigit(*c))
last = c;
}
if (last == NULL || (*(++last) == '\0')) {
(void) dt_pid_error(dtp, pcb, dpr, NULL, D_PROC_BADPROV,
"'%s' is not a valid provider", pdp->dtpd_provider);
return (-1);
}
errno = 0;
pid = strtol(last, &end, 10);
if (errno != 0 || end == last || end[0] != '\0' || pid <= 0) {
(void) dt_pid_error(dtp, pcb, dpr, NULL, D_PROC_BADPID,
"'%s' does not contain a valid pid", pdp->dtpd_provider);
return (-1);
}
return (pid);
}
int
dt_pid_create_probes(dtrace_probedesc_t *pdp, dtrace_hdl_t *dtp, dt_pcb_t *pcb)
{
char provname[DTRACE_PROVNAMELEN];
struct ps_prochandle *P;
dt_proc_t *dpr;
pid_t pid;
int err = 0;
assert(pcb != NULL);
if ((pid = dt_pid_get_pid(pdp, dtp, pcb, NULL)) == -1)
return (-1);
if (dtp->dt_ftfd == -1) {
if (dtp->dt_fterr == ENOENT) {
(void) dt_pid_error(dtp, pcb, NULL, NULL, D_PROC_NODEV,
"pid provider is not installed on this system");
} else {
(void) dt_pid_error(dtp, pcb, NULL, NULL, D_PROC_NODEV,
"pid provider is not available: %s",
strerror(dtp->dt_fterr));
}
return (-1);
}
(void) snprintf(provname, sizeof (provname), "pid%d", (int)pid);
if (gmatch(provname, pdp->dtpd_provider) != 0) {
if ((P = dt_proc_grab(dtp, pid, PGRAB_RDONLY | PGRAB_FORCE,
0)) == NULL) {
(void) dt_pid_error(dtp, pcb, NULL, NULL, D_PROC_GRAB,
"failed to grab process %d", (int)pid);
return (-1);
}
dpr = dt_proc_lookup(dtp, P, 0);
assert(dpr != NULL);
(void) pthread_mutex_lock(&dpr->dpr_lock);
if ((err = dt_pid_create_pid_probes(pdp, dtp, pcb, dpr)) == 0) {
/*
* Alert other retained enablings which may match
* against the newly created probes.
*/
(void) dt_ioctl(dtp, DTRACEIOC_ENABLE, NULL);
}
(void) pthread_mutex_unlock(&dpr->dpr_lock);
dt_proc_release(dtp, P);
}
/*
* If it's not strictly a pid provider, we might match a USDT provider.
*/
if (strcmp(provname, pdp->dtpd_provider) != 0) {
if ((P = dt_proc_grab(dtp, pid, 0, 1)) == NULL) {
(void) dt_pid_error(dtp, pcb, NULL, NULL, D_PROC_GRAB,
"failed to grab process %d", (int)pid);
return (-1);
}
dpr = dt_proc_lookup(dtp, P, 0);
assert(dpr != NULL);
(void) pthread_mutex_lock(&dpr->dpr_lock);
if (!dpr->dpr_usdt) {
err = dt_pid_create_usdt_probes(pdp, dtp, pcb, dpr);
dpr->dpr_usdt = B_TRUE;
}
(void) pthread_mutex_unlock(&dpr->dpr_lock);
dt_proc_release(dtp, P);
}
return (err ? -1 : 0);
}
int
dt_pid_create_probes_module(dtrace_hdl_t *dtp, dt_proc_t *dpr)
{
dtrace_enable_io_t args;
dtrace_prog_t *pgp;
dt_stmt_t *stp;
dtrace_probedesc_t *pdp, pd;
pid_t pid;
int ret = 0, found = B_FALSE;
char provname[DTRACE_PROVNAMELEN];
(void) snprintf(provname, sizeof (provname), "pid%d",
(int)dpr->dpr_pid);
for (pgp = dt_list_next(&dtp->dt_programs); pgp != NULL;
pgp = dt_list_next(pgp)) {
for (stp = dt_list_next(&pgp->dp_stmts); stp != NULL;
stp = dt_list_next(stp)) {
pdp = &stp->ds_desc->dtsd_ecbdesc->dted_probe;
pid = dt_pid_get_pid(pdp, dtp, NULL, dpr);
if (pid != dpr->dpr_pid)
continue;
found = B_TRUE;
pd = *pdp;
if (gmatch(provname, pdp->dtpd_provider) != 0 &&
dt_pid_create_pid_probes(&pd, dtp, NULL, dpr) != 0)
ret = 1;
/*
* If it's not strictly a pid provider, we might match
* a USDT provider.
*/
if (strcmp(provname, pdp->dtpd_provider) != 0 &&
dt_pid_create_usdt_probes(&pd, dtp, NULL, dpr) != 0)
ret = 1;
}
}
if (found) {
/*
* Give DTrace a shot to the ribs to get it to check
* out the newly created probes.
*/
args.dof = NULL;
args.n_matched = 0;
(void) dt_ioctl(dtp, DTRACEIOC_ENABLE, &args);
}
return (ret);
}
/*
* libdtrace has a backroom deal with us to ask us for type information on
* behalf of pid provider probes when fasttrap doesn't return any type
* information. Instead we'll look up the module and see if there is type
* information available. However, if there is no type information available due
* to a lack of CTF data, then we want to make sure that DTrace still carries on
* in face of that. As such we don't have a meaningful exit code about failure.
* We emit information about why we failed to the dtrace debug log so someone
* can figure it out by asking nicely for DTRACE_DEBUG.
*/
void
dt_pid_get_types(dtrace_hdl_t *dtp, const dtrace_probedesc_t *pdp,
dtrace_argdesc_t *adp, int *nargs)
{
dt_module_t *dmp;
ctf_file_t *fp;
ctf_funcinfo_t f;
ctf_id_t argv[32];
GElf_Sym sym;
prsyminfo_t si;
struct ps_prochandle *p;
int i, args;
char buf[DTRACE_ARGTYPELEN];
const char *mptr;
char *eptr;
int ret = 0;
int argc = sizeof (argv) / sizeof (ctf_id_t);
Lmid_t lmid;
/* Set up a potential outcome */
args = *nargs;
*nargs = 0;
/*
* If we don't have an entry or return probe then we can just stop right
* now as we don't have arguments for offset probes.
*/
if (strcmp(pdp->dtpd_name, "entry") != 0 &&
strcmp(pdp->dtpd_name, "return") != 0)
return;
dmp = dt_module_create(dtp, pdp->dtpd_provider);
if (dmp == NULL) {
dt_dprintf("failed to find module for %s\n",
pdp->dtpd_provider);
return;
}
if (dt_module_load(dtp, dmp) != 0) {
dt_dprintf("failed to load module for %s\n",
pdp->dtpd_provider);
return;
}
/*
* We may be working with a module that doesn't have ctf. If that's the
* case then we just return now and move on with life.
*/
fp = dt_module_getctflib(dtp, dmp, pdp->dtpd_mod);
if (fp == NULL) {
dt_dprintf("no ctf container for %s\n",
pdp->dtpd_mod);
return;
}
p = dt_proc_grab(dtp, dmp->dm_pid, 0, PGRAB_RDONLY | PGRAB_FORCE);
if (p == NULL) {
dt_dprintf("failed to grab pid\n");
return;
}
dt_proc_lock(dtp, p);
/*
* Check to see if the D module has a link map ID and separate that out
* for properly interrogating libproc.
*/
if ((mptr = strchr(pdp->dtpd_mod, '`')) != NULL) {
if (strlen(pdp->dtpd_mod) < 3) {
dt_dprintf("found weird modname with linkmap, "
"aborting: %s\n", pdp->dtpd_mod);
goto out;
}
if (pdp->dtpd_mod[0] != 'L' || pdp->dtpd_mod[1] != 'M') {
dt_dprintf("missing leading 'LM', "
"aborting: %s\n", pdp->dtpd_mod);
goto out;
}
errno = 0;
lmid = strtol(pdp->dtpd_mod + 2, &eptr, 16);
if (errno == ERANGE || eptr != mptr) {
dt_dprintf("failed to parse out lmid, aborting: %s\n",
pdp->dtpd_mod);
goto out;
}
mptr++;
} else {
mptr = pdp->dtpd_mod;
lmid = 0;
}
if (Pxlookup_by_name(p, lmid, mptr, pdp->dtpd_func,
&sym, &si) != 0) {
dt_dprintf("failed to find function %s in %s`%s\n",
pdp->dtpd_func, pdp->dtpd_provider, pdp->dtpd_mod);
goto out;
}
if (ctf_func_info(fp, si.prs_id, &f) == CTF_ERR) {
dt_dprintf("failed to get ctf information for %s in %s`%s\n",
pdp->dtpd_func, pdp->dtpd_provider, pdp->dtpd_mod);
goto out;
}
(void) snprintf(buf, sizeof (buf), "%s`%s", pdp->dtpd_provider,
pdp->dtpd_mod);
if (strcmp(pdp->dtpd_name, "return") == 0) {
if (args < 2)
goto out;
bzero(adp, sizeof (dtrace_argdesc_t));
adp->dtargd_ndx = 0;
adp->dtargd_id = pdp->dtpd_id;
adp->dtargd_mapping = adp->dtargd_ndx;
/*
* We explicitly leave out the library here, we only care that
* it is some int. We are assuming that there is no ctf
* container in here that is lying about what an int is.
*/
(void) snprintf(adp->dtargd_native, DTRACE_ARGTYPELEN,
"user %s`%s", pdp->dtpd_provider, "int");
adp++;
bzero(adp, sizeof (dtrace_argdesc_t));
adp->dtargd_ndx = 1;
adp->dtargd_id = pdp->dtpd_id;
adp->dtargd_mapping = adp->dtargd_ndx;
ret = snprintf(adp->dtargd_native, DTRACE_ARGTYPELEN,
"userland ");
(void) ctf_type_qname(fp, f.ctc_return, adp->dtargd_native +
ret, DTRACE_ARGTYPELEN - ret, buf);
*nargs = 2;
} else {
if (ctf_func_args(fp, si.prs_id, argc, argv) == CTF_ERR)
goto out;
*nargs = MIN(args, f.ctc_argc);
for (i = 0; i < *nargs; i++, adp++) {
bzero(adp, sizeof (dtrace_argdesc_t));
adp->dtargd_ndx = i;
adp->dtargd_id = pdp->dtpd_id;
adp->dtargd_mapping = adp->dtargd_ndx;
ret = snprintf(adp->dtargd_native, DTRACE_ARGTYPELEN,
"userland ");
(void) ctf_type_qname(fp, argv[i], adp->dtargd_native +
ret, DTRACE_ARGTYPELEN - ret, buf);
}
}
out:
dt_proc_unlock(dtp, p);
dt_proc_release(dtp, p);
}
