1 /* $NetBSD: dtrace_subr.c,v 1.2 2014/03/10 03:04:57 ozaki-r Exp $ */
2
3 /*
4 * CDDL HEADER START
5 *
6 * The contents of this file are subject to the terms of the
7 * Common Development and Distribution License, Version 1.0 only
8 * (the "License"). You may not use this file except in compliance
9 * with the License.
10 *
11 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
12 * or http://www.opensolaris.org/os/licensing.
13 * See the License for the specific language governing permissions
14 * and limitations under the License.
15 *
16 * When distributing Covered Code, include this CDDL HEADER in each
17 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
18 * If applicable, add the following below this CDDL HEADER, with the
19 * fields enclosed by brackets "[]" replaced with your own identifying
20 * information: Portions Copyright [yyyy] [name of copyright owner]
21 *
22 * CDDL HEADER END
23 *
24 * $FreeBSD$
25 *
26 */
27 /*
28 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
29 * Use is subject to license terms.
30 */
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/types.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/kmem.h>
38 #include <sys/xcall.h>
39 #include <sys/cpu.h>
40 #include <sys/cpuvar.h>
41 #include <sys/dtrace_impl.h>
42 #include <sys/dtrace_bsd.h>
43 #include <machine/cpu.h>
44 #include <machine/frame.h>
45 #include <machine/vmparam.h>
46 #include <uvm/uvm_pglist.h>
47 #include <uvm/uvm_prot.h>
48 #include <uvm/uvm_pmap.h>
49
50 extern uintptr_t kernelbase;
51 extern uintptr_t dtrace_in_probe_addr;
52 extern int dtrace_in_probe;
53 extern dtrace_id_t dtrace_probeid_error;
54
55 int dtrace_invop(uintptr_t, uintptr_t *, uintptr_t);
56
57 typedef struct dtrace_invop_hdlr {
58 int (*dtih_func)(uintptr_t, uintptr_t *, uintptr_t);
59 struct dtrace_invop_hdlr *dtih_next;
60 } dtrace_invop_hdlr_t;
61
62 dtrace_invop_hdlr_t *dtrace_invop_hdlr;
63
64 void dtrace_gethrtime_init(void *arg);
65
66 int
dtrace_invop(uintptr_t addr,uintptr_t * stack,uintptr_t eax)67 dtrace_invop(uintptr_t addr, uintptr_t *stack, uintptr_t eax)
68 {
69 dtrace_invop_hdlr_t *hdlr;
70 int rval;
71
72 for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next)
73 if ((rval = hdlr->dtih_func(addr, stack, eax)) != 0)
74 return (rval);
75
76 return (0);
77 }
78
79 void
dtrace_invop_add(int (* func)(uintptr_t,uintptr_t *,uintptr_t))80 dtrace_invop_add(int (*func)(uintptr_t, uintptr_t *, uintptr_t))
81 {
82 dtrace_invop_hdlr_t *hdlr;
83
84 hdlr = kmem_alloc(sizeof (dtrace_invop_hdlr_t), KM_SLEEP);
85 hdlr->dtih_func = func;
86 hdlr->dtih_next = dtrace_invop_hdlr;
87 dtrace_invop_hdlr = hdlr;
88 }
89
90 void
dtrace_invop_remove(int (* func)(uintptr_t,uintptr_t *,uintptr_t))91 dtrace_invop_remove(int (*func)(uintptr_t, uintptr_t *, uintptr_t))
92 {
93 dtrace_invop_hdlr_t *hdlr = dtrace_invop_hdlr, *prev = NULL;
94
95 for (;;) {
96 if (hdlr == NULL)
97 panic("attempt to remove non-existent invop handler");
98
99 if (hdlr->dtih_func == func)
100 break;
101
102 prev = hdlr;
103 hdlr = hdlr->dtih_next;
104 }
105
106 if (prev == NULL) {
107 ASSERT(dtrace_invop_hdlr == hdlr);
108 dtrace_invop_hdlr = hdlr->dtih_next;
109 } else {
110 ASSERT(dtrace_invop_hdlr != hdlr);
111 prev->dtih_next = hdlr->dtih_next;
112 }
113
114 kmem_free(hdlr, sizeof (dtrace_invop_hdlr_t));
115 }
116
117 void
dtrace_toxic_ranges(void (* func)(uintptr_t base,uintptr_t limit))118 dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit))
119 {
120 (*func)(0, kernelbase);
121 }
122
123 static void
xcall_func(void * arg0,void * arg1)124 xcall_func(void *arg0, void *arg1)
125 {
126 dtrace_xcall_t func = arg0;
127
128 (*func)(arg1);
129 }
130
131 void
dtrace_xcall(processorid_t cpu,dtrace_xcall_t func,void * arg)132 dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg)
133 {
134 uint64_t where;
135
136 if (cpu == DTRACE_CPUALL) {
137 where = xc_broadcast(0, xcall_func, func, arg);
138 } else {
139 struct cpu_info *cinfo = cpu_lookup(cpu);
140
141 KASSERT(cinfo != NULL);
142 where = xc_unicast(0, xcall_func, func, arg, cinfo);
143 }
144 xc_wait(where);
145
146 /* XXX Q. Do we really need the other cpus to wait also?
147 * (see solaris:xc_sync())
148 */
149 }
150
151 static void
dtrace_sync_func(void)152 dtrace_sync_func(void)
153 {
154 }
155
156 void
dtrace_sync(void)157 dtrace_sync(void)
158 {
159 dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL);
160 }
161
162 /*
163 * DTrace needs a high resolution time function which can
164 * be called from a probe context and guaranteed not to have
165 * instrumented with probes itself.
166 *
167 * Returns nanoseconds since boot.
168 */
169 uint64_t
dtrace_gethrtime()170 dtrace_gethrtime()
171 {
172 struct timespec curtime;
173
174 nanouptime(&curtime);
175
176 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec);
177
178 }
179
180 uint64_t
dtrace_gethrestime(void)181 dtrace_gethrestime(void)
182 {
183 struct timespec curtime;
184
185 getnanotime(&curtime);
186
187 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec);
188 }
189
190 /* Function to handle DTrace traps during probes. Not used on ARM yet */
191 int
dtrace_trap(struct trapframe * frame,u_int type)192 dtrace_trap(struct trapframe *frame, u_int type)
193 {
194 cpuid_t cpuid = cpu_number(); /* current cpu id */
195
196 /*
197 * A trap can occur while DTrace executes a probe. Before
198 * executing the probe, DTrace blocks re-scheduling and sets
199 * a flag in it's per-cpu flags to indicate that it doesn't
200 * want to fault. On returning from the probe, the no-fault
201 * flag is cleared and finally re-scheduling is enabled.
202 *
203 * Check if DTrace has enabled 'no-fault' mode:
204 *
205 */
206
207 if ((cpu_core[cpuid].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT) != 0) {
208 /*
209 * There are only a couple of trap types that are expected.
210 * All the rest will be handled in the usual way.
211 */
212 switch (type) {
213 /* Page fault. */
214 case 0:
215 /* Flag a bad address. */
216 cpu_core[cpuid].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR;
217 cpu_core[cpuid].cpuc_dtrace_illval = 0;
218
219 /*
220 * Offset the instruction pointer to the instruction
221 * following the one causing the fault.
222 */
223 panic("%s", __func__);
224 // frame->pc += sizeof(int);
225 return (1);
226 default:
227 /* Handle all other traps in the usual way. */
228 break;
229 }
230 }
231
232 /* Handle the trap in the usual way. */
233 return (0);
234 }
235
236 void
dtrace_probe_error(dtrace_state_t * state,dtrace_epid_t epid,int which,int fault,int fltoffs,uintptr_t illval)237 dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which,
238 int fault, int fltoffs, uintptr_t illval)
239 {
240
241 dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state,
242 (uintptr_t)epid,
243 (uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs);
244 }
245
246 void
dtrace_gethrtime_init(void * arg)247 dtrace_gethrtime_init(void *arg)
248 {
249 /* FIXME */
250 }
251