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Diffstat (limited to 'src/VBox/ExtPacks/VBoxDTrace/onnv/uts/intel/dtrace/sdt.c')
-rw-r--r--src/VBox/ExtPacks/VBoxDTrace/onnv/uts/intel/dtrace/sdt.c557
1 files changed, 557 insertions, 0 deletions
diff --git a/src/VBox/ExtPacks/VBoxDTrace/onnv/uts/intel/dtrace/sdt.c b/src/VBox/ExtPacks/VBoxDTrace/onnv/uts/intel/dtrace/sdt.c
new file mode 100644
index 00000000..38be2233
--- /dev/null
+++ b/src/VBox/ExtPacks/VBoxDTrace/onnv/uts/intel/dtrace/sdt.c
@@ -0,0 +1,557 @@
+/*
+ * 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 2009 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+
+#include <sys/modctl.h>
+#include <sys/sunddi.h>
+#include <sys/dtrace.h>
+#include <sys/kobj.h>
+#include <sys/stat.h>
+#include <sys/conf.h>
+#include <vm/seg_kmem.h>
+#include <sys/stack.h>
+#include <sys/frame.h>
+#include <sys/dtrace_impl.h>
+#include <sys/cmn_err.h>
+#include <sys/sysmacros.h>
+#include <sys/privregs.h>
+#include <sys/sdt_impl.h>
+
+#define SDT_PATCHVAL 0xf0
+#define SDT_ADDR2NDX(addr) ((((uintptr_t)(addr)) >> 4) & sdt_probetab_mask)
+#define SDT_PROBETAB_SIZE 0x1000 /* 4k entries -- 16K total */
+
+static dev_info_t *sdt_devi;
+static int sdt_verbose = 0;
+static sdt_probe_t **sdt_probetab;
+static int sdt_probetab_size;
+static int sdt_probetab_mask;
+
+/*ARGSUSED*/
+static int
+sdt_invop(uintptr_t addr, uintptr_t *stack, uintptr_t eax)
+{
+ uintptr_t stack0, stack1, stack2, stack3, stack4;
+ int i = 0;
+ sdt_probe_t *sdt = sdt_probetab[SDT_ADDR2NDX(addr)];
+
+#ifdef __amd64
+ /*
+ * On amd64, stack[0] contains the dereferenced stack pointer,
+ * stack[1] contains savfp, stack[2] contains savpc. We want
+ * to step over these entries.
+ */
+ i += 3;
+#endif
+
+ for (; sdt != NULL; sdt = sdt->sdp_hashnext) {
+ if ((uintptr_t)sdt->sdp_patchpoint == addr) {
+ /*
+ * When accessing the arguments on the stack, we must
+ * protect against accessing beyond the stack. We can
+ * safely set NOFAULT here -- we know that interrupts
+ * are already disabled.
+ */
+ DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+ stack0 = stack[i++];
+ stack1 = stack[i++];
+ stack2 = stack[i++];
+ stack3 = stack[i++];
+ stack4 = stack[i++];
+ DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT |
+ CPU_DTRACE_BADADDR);
+
+ dtrace_probe(sdt->sdp_id, stack0, stack1,
+ stack2, stack3, stack4);
+
+ return (DTRACE_INVOP_NOP);
+ }
+ }
+
+ return (0);
+}
+
+/*ARGSUSED*/
+static void
+sdt_provide_module(void *arg, struct modctl *ctl)
+{
+ struct module *mp = ctl->mod_mp;
+ char *modname = ctl->mod_modname;
+ sdt_probedesc_t *sdpd;
+ sdt_probe_t *sdp, *old;
+ sdt_provider_t *prov;
+ int len;
+
+ /*
+ * One for all, and all for one: if we haven't yet registered all of
+ * our providers, we'll refuse to provide anything.
+ */
+ for (prov = sdt_providers; prov->sdtp_name != NULL; prov++) {
+ if (prov->sdtp_id == DTRACE_PROVNONE)
+ return;
+ }
+
+ if (mp->sdt_nprobes != 0 || (sdpd = mp->sdt_probes) == NULL)
+ return;
+
+ for (sdpd = mp->sdt_probes; sdpd != NULL; sdpd = sdpd->sdpd_next) {
+ char *name = sdpd->sdpd_name, *func, *nname;
+ int i, j;
+ sdt_provider_t *prov;
+ ulong_t offs;
+ dtrace_id_t id;
+
+ for (prov = sdt_providers; prov->sdtp_prefix != NULL; prov++) {
+ char *prefix = prov->sdtp_prefix;
+
+ if (strncmp(name, prefix, strlen(prefix)) == 0) {
+ name += strlen(prefix);
+ break;
+ }
+ }
+
+ nname = kmem_alloc(len = strlen(name) + 1, KM_SLEEP);
+
+ for (i = 0, j = 0; name[j] != '\0'; i++) {
+ if (name[j] == '_' && name[j + 1] == '_') {
+ nname[i] = '-';
+ j += 2;
+ } else {
+ nname[i] = name[j++];
+ }
+ }
+
+ nname[i] = '\0';
+
+ sdp = kmem_zalloc(sizeof (sdt_probe_t), KM_SLEEP);
+ sdp->sdp_loadcnt = ctl->mod_loadcnt;
+ sdp->sdp_ctl = ctl;
+ sdp->sdp_name = nname;
+ sdp->sdp_namelen = len;
+ sdp->sdp_provider = prov;
+
+ func = kobj_searchsym(mp, sdpd->sdpd_offset, &offs);
+
+ if (func == NULL)
+ func = "<unknown>";
+
+ /*
+ * We have our provider. Now create the probe.
+ */
+ if ((id = dtrace_probe_lookup(prov->sdtp_id, modname,
+ func, nname)) != DTRACE_IDNONE) {
+ old = dtrace_probe_arg(prov->sdtp_id, id);
+ ASSERT(old != NULL);
+
+ sdp->sdp_next = old->sdp_next;
+ sdp->sdp_id = id;
+ old->sdp_next = sdp;
+ } else {
+ sdp->sdp_id = dtrace_probe_create(prov->sdtp_id,
+ modname, func, nname, 3, sdp);
+
+ mp->sdt_nprobes++;
+ }
+
+ sdp->sdp_hashnext =
+ sdt_probetab[SDT_ADDR2NDX(sdpd->sdpd_offset)];
+ sdt_probetab[SDT_ADDR2NDX(sdpd->sdpd_offset)] = sdp;
+
+ sdp->sdp_patchval = SDT_PATCHVAL;
+ sdp->sdp_patchpoint = (uint8_t *)sdpd->sdpd_offset;
+ sdp->sdp_savedval = *sdp->sdp_patchpoint;
+ }
+}
+
+/*ARGSUSED*/
+static void
+sdt_destroy(void *arg, dtrace_id_t id, void *parg)
+{
+ sdt_probe_t *sdp = parg, *old, *last, *hash;
+ struct modctl *ctl = sdp->sdp_ctl;
+ int ndx;
+
+ if (ctl != NULL && ctl->mod_loadcnt == sdp->sdp_loadcnt) {
+ if ((ctl->mod_loadcnt == sdp->sdp_loadcnt &&
+ ctl->mod_loaded)) {
+ ((struct module *)(ctl->mod_mp))->sdt_nprobes--;
+ }
+ }
+
+ while (sdp != NULL) {
+ old = sdp;
+
+ /*
+ * Now we need to remove this probe from the sdt_probetab.
+ */
+ ndx = SDT_ADDR2NDX(sdp->sdp_patchpoint);
+ last = NULL;
+ hash = sdt_probetab[ndx];
+
+ while (hash != sdp) {
+ ASSERT(hash != NULL);
+ last = hash;
+ hash = hash->sdp_hashnext;
+ }
+
+ if (last != NULL) {
+ last->sdp_hashnext = sdp->sdp_hashnext;
+ } else {
+ sdt_probetab[ndx] = sdp->sdp_hashnext;
+ }
+
+ kmem_free(sdp->sdp_name, sdp->sdp_namelen);
+ sdp = sdp->sdp_next;
+ kmem_free(old, sizeof (sdt_probe_t));
+ }
+}
+
+/*ARGSUSED*/
+static int
+sdt_enable(void *arg, dtrace_id_t id, void *parg)
+{
+ sdt_probe_t *sdp = parg;
+ struct modctl *ctl = sdp->sdp_ctl;
+
+ ctl->mod_nenabled++;
+
+ /*
+ * If this module has disappeared since we discovered its probes,
+ * refuse to enable it.
+ */
+ if (!ctl->mod_loaded) {
+ if (sdt_verbose) {
+ cmn_err(CE_NOTE, "sdt is failing for probe %s "
+ "(module %s unloaded)",
+ sdp->sdp_name, ctl->mod_modname);
+ }
+ goto err;
+ }
+
+ /*
+ * Now check that our modctl has the expected load count. If it
+ * doesn't, this module must have been unloaded and reloaded -- and
+ * we're not going to touch it.
+ */
+ if (ctl->mod_loadcnt != sdp->sdp_loadcnt) {
+ if (sdt_verbose) {
+ cmn_err(CE_NOTE, "sdt is failing for probe %s "
+ "(module %s reloaded)",
+ sdp->sdp_name, ctl->mod_modname);
+ }
+ goto err;
+ }
+
+ while (sdp != NULL) {
+ *sdp->sdp_patchpoint = sdp->sdp_patchval;
+ sdp = sdp->sdp_next;
+ }
+err:
+ return (0);
+}
+
+/*ARGSUSED*/
+static void
+sdt_disable(void *arg, dtrace_id_t id, void *parg)
+{
+ sdt_probe_t *sdp = parg;
+ struct modctl *ctl = sdp->sdp_ctl;
+
+ ctl->mod_nenabled--;
+
+ if (!ctl->mod_loaded || ctl->mod_loadcnt != sdp->sdp_loadcnt)
+ goto err;
+
+ while (sdp != NULL) {
+ *sdp->sdp_patchpoint = sdp->sdp_savedval;
+ sdp = sdp->sdp_next;
+ }
+
+err:
+ ;
+}
+
+/*ARGSUSED*/
+uint64_t
+sdt_getarg(void *arg, dtrace_id_t id, void *parg, int argno, int aframes)
+{
+ uintptr_t val;
+ struct frame *fp = (struct frame *)dtrace_getfp();
+ uintptr_t *stack;
+ int i;
+#if defined(__amd64)
+ /*
+ * A total of 6 arguments are passed via registers; any argument with
+ * index of 5 or lower is therefore in a register.
+ */
+ int inreg = 5;
+#endif
+
+ for (i = 1; i <= aframes; i++) {
+ fp = (struct frame *)(fp->fr_savfp);
+
+ if (fp->fr_savpc == (pc_t)dtrace_invop_callsite) {
+#if !defined(__amd64)
+ /*
+ * If we pass through the invalid op handler, we will
+ * use the pointer that it passed to the stack as the
+ * second argument to dtrace_invop() as the pointer to
+ * the stack.
+ */
+ stack = ((uintptr_t **)&fp[1])[1];
+#else
+ /*
+ * In the case of amd64, we will use the pointer to the
+ * regs structure that was pushed when we took the
+ * trap. To get this structure, we must increment
+ * beyond the frame structure. If the argument that
+ * we're seeking is passed on the stack, we'll pull
+ * the true stack pointer out of the saved registers
+ * and decrement our argument by the number of
+ * arguments passed in registers; if the argument
+ * we're seeking is passed in regsiters, we can just
+ * load it directly.
+ */
+ struct regs *rp = (struct regs *)((uintptr_t)&fp[1] +
+ sizeof (uintptr_t));
+
+ if (argno <= inreg) {
+ stack = (uintptr_t *)&rp->r_rdi;
+ } else {
+ stack = (uintptr_t *)(rp->r_rsp);
+ argno -= (inreg + 1);
+ }
+#endif
+ goto load;
+ }
+ }
+
+ /*
+ * We know that we did not come through a trap to get into
+ * dtrace_probe() -- the provider simply called dtrace_probe()
+ * directly. As this is the case, we need to shift the argument
+ * that we're looking for: the probe ID is the first argument to
+ * dtrace_probe(), so the argument n will actually be found where
+ * one would expect to find argument (n + 1).
+ */
+ argno++;
+
+#if defined(__amd64)
+ if (argno <= inreg) {
+ /*
+ * This shouldn't happen. If the argument is passed in a
+ * register then it should have been, well, passed in a
+ * register...
+ */
+ DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP);
+ return (0);
+ }
+
+ argno -= (inreg + 1);
+#endif
+ stack = (uintptr_t *)&fp[1];
+
+load:
+ DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+ val = stack[argno];
+ DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+
+ return (val);
+}
+
+static dtrace_pops_t sdt_pops = {
+ NULL,
+ sdt_provide_module,
+ sdt_enable,
+ sdt_disable,
+ NULL,
+ NULL,
+ sdt_getargdesc,
+ sdt_getarg,
+ NULL,
+ sdt_destroy
+};
+
+/*ARGSUSED*/
+static int
+sdt_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
+{
+ sdt_provider_t *prov;
+
+ if (ddi_create_minor_node(devi, "sdt", S_IFCHR,
+ 0, DDI_PSEUDO, NULL) == DDI_FAILURE) {
+ cmn_err(CE_NOTE, "/dev/sdt couldn't create minor node");
+ ddi_remove_minor_node(devi, NULL);
+ return (DDI_FAILURE);
+ }
+
+ ddi_report_dev(devi);
+ sdt_devi = devi;
+
+ if (sdt_probetab_size == 0)
+ sdt_probetab_size = SDT_PROBETAB_SIZE;
+
+ sdt_probetab_mask = sdt_probetab_size - 1;
+ sdt_probetab =
+ kmem_zalloc(sdt_probetab_size * sizeof (sdt_probe_t *), KM_SLEEP);
+ dtrace_invop_add(sdt_invop);
+
+ for (prov = sdt_providers; prov->sdtp_name != NULL; prov++) {
+ if (dtrace_register(prov->sdtp_name, prov->sdtp_attr,
+ DTRACE_PRIV_KERNEL, NULL,
+ &sdt_pops, prov, &prov->sdtp_id) != 0) {
+ cmn_err(CE_WARN, "failed to register sdt provider %s",
+ prov->sdtp_name);
+ }
+ }
+
+ return (DDI_SUCCESS);
+}
+
+/*ARGSUSED*/
+static int
+sdt_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
+{
+ sdt_provider_t *prov;
+
+ switch (cmd) {
+ case DDI_DETACH:
+ break;
+
+ case DDI_SUSPEND:
+ return (DDI_SUCCESS);
+
+ default:
+ return (DDI_FAILURE);
+ }
+
+ for (prov = sdt_providers; prov->sdtp_name != NULL; prov++) {
+ if (prov->sdtp_id != DTRACE_PROVNONE) {
+ if (dtrace_unregister(prov->sdtp_id) != 0)
+ return (DDI_FAILURE);
+
+ prov->sdtp_id = DTRACE_PROVNONE;
+ }
+ }
+
+ dtrace_invop_remove(sdt_invop);
+ kmem_free(sdt_probetab, sdt_probetab_size * sizeof (sdt_probe_t *));
+
+ return (DDI_SUCCESS);
+}
+
+/*ARGSUSED*/
+static int
+sdt_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
+{
+ int error;
+
+ switch (infocmd) {
+ case DDI_INFO_DEVT2DEVINFO:
+ *result = (void *)sdt_devi;
+ error = DDI_SUCCESS;
+ break;
+ case DDI_INFO_DEVT2INSTANCE:
+ *result = (void *)0;
+ error = DDI_SUCCESS;
+ break;
+ default:
+ error = DDI_FAILURE;
+ }
+ return (error);
+}
+
+/*ARGSUSED*/
+static int
+sdt_open(dev_t *devp, int flag, int otyp, cred_t *cred_p)
+{
+ return (0);
+}
+
+static struct cb_ops sdt_cb_ops = {
+ sdt_open, /* open */
+ nodev, /* close */
+ nulldev, /* strategy */
+ nulldev, /* print */
+ nodev, /* dump */
+ nodev, /* read */
+ nodev, /* write */
+ nodev, /* ioctl */
+ nodev, /* devmap */
+ nodev, /* mmap */
+ nodev, /* segmap */
+ nochpoll, /* poll */
+ ddi_prop_op, /* cb_prop_op */
+ 0, /* streamtab */
+ D_NEW | D_MP /* Driver compatibility flag */
+};
+
+static struct dev_ops sdt_ops = {
+ DEVO_REV, /* devo_rev, */
+ 0, /* refcnt */
+ sdt_info, /* get_dev_info */
+ nulldev, /* identify */
+ nulldev, /* probe */
+ sdt_attach, /* attach */
+ sdt_detach, /* detach */
+ nodev, /* reset */
+ &sdt_cb_ops, /* driver operations */
+ NULL, /* bus operations */
+ nodev, /* dev power */
+ ddi_quiesce_not_needed, /* quiesce */
+};
+
+/*
+ * Module linkage information for the kernel.
+ */
+static struct modldrv modldrv = {
+ &mod_driverops, /* module type (this is a pseudo driver) */
+ "Statically Defined Tracing", /* name of module */
+ &sdt_ops, /* driver ops */
+};
+
+static struct modlinkage modlinkage = {
+ MODREV_1,
+ (void *)&modldrv,
+ NULL
+};
+
+int
+_init(void)
+{
+ return (mod_install(&modlinkage));
+}
+
+int
+_info(struct modinfo *modinfop)
+{
+ return (mod_info(&modlinkage, modinfop));
+}
+
+int
+_fini(void)
+{
+ return (mod_remove(&modlinkage));
+}
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