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);
}
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
}
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(MUTEX_HELD(&dpr->dpr_lock));
(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",
(int)Pstatus(P)->pr_pid, strerror(errno));
}
/*
* Put the module name in its canonical form.
*/
(void) dt_pid_fix_mod(pdp, P);
return (ret);
}
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_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_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);
}
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);
}
