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Differential D39229 Diff 121498 sys/cddl/dev/kinst/kinst.c

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sys/cddl/dev/kinst/kinst.c

Show First 20 Lines • Show All 59 Lines • ▼ Show 20 Linesstatic struct cdevsw kinst_cdevsw = {
.d_close = kinst_close, .d_close = kinst_close,
.d_ioctl = kinst_ioctl, .d_ioctl = kinst_ioctl,
}; };
static dtrace_provider_id_t kinst_id; static dtrace_provider_id_t kinst_id;
struct kinst_probe_list *kinst_probetab; struct kinst_probe_list *kinst_probetab;
static struct cdev *kinst_cdev; static struct cdev *kinst_cdev;
int
kinst_excluded(const char *name)
{
if (strncmp(name, "dtrace_", strlen("dtrace_")) == 0 &&
strncmp(name, "dtrace_safe_", strlen("dtrace_safe_")) != 0) {
/*
* Anything beginning with "dtrace_" may be called
* from probe context unless it explicitly indicates
* that it won't be called from probe context by
* using the prefix "dtrace_safe_".
*/
return (1);
}
/*
* Do not allow instrumentation of exception handlers.
*/
#ifdef __amd64__
/* Xfast_syscall* are safe to trace. */
if (strcmp(name, "Xdiv") == 0 ||
markjUnsubmitted
Done
Inline Actions

This is handled by the push rbp check. Only amd64 has that check currently, but I think riscv should perform that as well, see my comments in that review.

markj: This is handled by the push rbp check. Only amd64 has that check currently, but I think riscv…
strcmp(name, "Xdbg") == 0 ||
strcmp(name, "Xnmi") == 0 ||
strcmp(name, "Xbpt") == 0 ||
strcmp(name, "Xofl") == 0 ||
strcmp(name, "Xbnd") == 0 ||
strcmp(name, "Xill") == 0 ||
strcmp(name, "Xdna") == 0 ||
strcmp(name, "Xfpusegm") == 0 ||
strcmp(name, "Xtss") == 0 ||
strcmp(name, "Xmissing") == 0 ||
strcmp(name, "Xstk") == 0 ||
strcmp(name, "Xprot") == 0 ||
strcmp(name, "Xpage") == 0 ||
strcmp(name, "Xmchk") == 0 ||
strcmp(name, "Xrsvd") == 0 ||
strcmp(name, "Xfpu") == 0 ||
strcmp(name, "Xalign") == 0 ||
strcmp(name, "Xxmm") == 0 ||
strcmp(name, "Xdblfault") == 0 ||
strcmp(name, "Xdiv_pti") == 0 ||
strcmp(name, "Xbpt_pti") == 0 ||
strcmp(name, "Xofl_pti") == 0 ||
strcmp(name, "Xbnd_pti") == 0 ||
strcmp(name, "Xill_pti") == 0 ||
strcmp(name, "Xdna_pti") == 0 ||
strcmp(name, "Xfpusegm_pti") == 0 ||
strcmp(name, "Xtss_pti") == 0 ||
strcmp(name, "Xmissing_pti") == 0 ||
strcmp(name, "Xstk_pti") == 0 ||
strcmp(name, "Xprot_pti") == 0 ||
strcmp(name, "Xpage_pti") == 0 ||
strcmp(name, "Xrsvd_pti") == 0 ||
strcmp(name, "Xfpu_pti") == 0 ||
strcmp(name, "Xalign_pti") == 0 ||
strcmp(name, "Xxmm_pti") == 0 ||
strcmp(name, "Xdtrace_ret") == 0 ||
strcmp(name, "Xdtrace_ret_pti") == 0 ||
strcmp(name, "Xxen_intr_upcall") == 0 ||
strcmp(name, "Xxen_intr_upcall_pti") == 0)
return (1);
#endif /* __amd64__ */
#ifdef __riscv
if (strcmp(name, "cpu_exception_handler") == 0 ||
strcmp(name, "cpu_exception_handler_supervisor") == 0 ||
strcmp(name, "cpu_exception_handler_user") == 0 ||
strcmp(name, "do_trap_supervisor") == 0 ||
strcmp(name, "do_trap_user") == 0)
return (1);
#endif /* __riscv */
#ifdef __aarch64__
if (strcmp(name, "handle_el1h_sync") == 0 ||
strcmp(name, "do_el1h_sync") == 0)
return (0);
#endif /* __aarch64__ */
/*
* Tracing cpu_switch() can trigger panics.
*/
if (strcmp(name, "cpu_switch") == 0)
return (1);
/*
* Omit instrumentation of functions that are probably in DDB. It
* makes it too hard to debug broken kinst.
*
* NB: kdb_enter() can be excluded, but its call to printf() can't be.
* This is generally OK since we're not yet in debugging context.
*/
if (strncmp(name, "db_", strlen("db_")) == 0 ||
strncmp(name, "kdb_", strlen("kdb_")) == 0)
return (1);
/*
* Lock owner methods may be called from probe context.
*/
if (strcmp(name, "owner_mtx") == 0 ||
strcmp(name, "owner_rm") == 0 ||
strcmp(name, "owner_rw") == 0 ||
strcmp(name, "owner_sx") == 0)
return (1);
/*
* Stack unwinders may be called from probe context on some
* platforms.
*/
#if defined(__aarch64__) || defined(__riscv)
if (strcmp(name, "unwind_frame") == 0)
return (1);
#endif
/*
* When DTrace is built into the kernel we need to exclude the kinst
* functions from instrumentation.
*/
#ifndef _KLD_MODULE
if (strncmp(name, "kinst_", strlen("kinst_")) == 0)
return (1);
#endif
if (strcmp(name, "trap_check") == 0)
return (1);
return (0);
}
void void
kinst_probe_create(struct kinst_probe *kp, linker_file_t lf) kinst_probe_create(struct kinst_probe *kp, linker_file_t lf)
{ {
kp->kp_id = dtrace_probe_create(kinst_id, lf->filename, kp->kp_id = dtrace_probe_create(kinst_id, lf->filename,
kp->kp_func, kp->kp_name, 3, kp); kp->kp_func, kp->kp_name, 3, kp);
LIST_INSERT_HEAD(KINST_GETPROBE(kp->kp_patchpoint), kp, kp_hashnext); LIST_INSERT_HEAD(KINST_GETPROBE(kp->kp_patchpoint), kp, kp_hashnext);
} }
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