1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 *
22 * $FreeBSD$
23 *
24 */
25 /*
26 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
27 * Use is subject to license terms.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/types.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/kmem.h>
39 #include <sys/smp.h>
40 #include <sys/dtrace_impl.h>
41 #include <sys/dtrace_bsd.h>
42 #include <machine/armreg.h>
43 #include <machine/clock.h>
44 #include <machine/frame.h>
45 #include <machine/trap.h>
46 #include <vm/pmap.h>
47
48 #define DELAYBRANCH(x) ((int)(x) < 0)
49
50 #define BIT_PC 15
51 #define BIT_LR 14
52 #define BIT_SP 13
53
54 extern uintptr_t dtrace_in_probe_addr;
55 extern int dtrace_in_probe;
56 extern dtrace_id_t dtrace_probeid_error;
57 extern int (*dtrace_invop_jump_addr)(struct trapframe *);
58 extern void dtrace_getnanotime(struct timespec *tsp);
59
60 int dtrace_invop(uintptr_t, uintptr_t *, uintptr_t);
61 void dtrace_invop_init(void);
62 void dtrace_invop_uninit(void);
63
64 typedef struct dtrace_invop_hdlr {
65 int (*dtih_func)(uintptr_t, uintptr_t *, uintptr_t);
66 struct dtrace_invop_hdlr *dtih_next;
67 } dtrace_invop_hdlr_t;
68
69 dtrace_invop_hdlr_t *dtrace_invop_hdlr;
70
71 int
dtrace_invop(uintptr_t addr,uintptr_t * stack,uintptr_t eax)72 dtrace_invop(uintptr_t addr, uintptr_t *stack, uintptr_t eax)
73 {
74 dtrace_invop_hdlr_t *hdlr;
75 int rval;
76
77 for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next)
78 if ((rval = hdlr->dtih_func(addr, stack, eax)) != 0)
79 return (rval);
80
81 return (0);
82 }
83
84
85 void
dtrace_invop_add(int (* func)(uintptr_t,uintptr_t *,uintptr_t))86 dtrace_invop_add(int (*func)(uintptr_t, uintptr_t *, uintptr_t))
87 {
88 dtrace_invop_hdlr_t *hdlr;
89
90 hdlr = kmem_alloc(sizeof (dtrace_invop_hdlr_t), KM_SLEEP);
91 hdlr->dtih_func = func;
92 hdlr->dtih_next = dtrace_invop_hdlr;
93 dtrace_invop_hdlr = hdlr;
94 }
95
96 void
dtrace_invop_remove(int (* func)(uintptr_t,uintptr_t *,uintptr_t))97 dtrace_invop_remove(int (*func)(uintptr_t, uintptr_t *, uintptr_t))
98 {
99 dtrace_invop_hdlr_t *hdlr = dtrace_invop_hdlr, *prev = NULL;
100
101 for (;;) {
102 if (hdlr == NULL)
103 panic("attempt to remove non-existent invop handler");
104
105 if (hdlr->dtih_func == func)
106 break;
107
108 prev = hdlr;
109 hdlr = hdlr->dtih_next;
110 }
111
112 if (prev == NULL) {
113 ASSERT(dtrace_invop_hdlr == hdlr);
114 dtrace_invop_hdlr = hdlr->dtih_next;
115 } else {
116 ASSERT(dtrace_invop_hdlr != hdlr);
117 prev->dtih_next = hdlr->dtih_next;
118 }
119
120 kmem_free(hdlr, 0);
121 }
122
123
124 /*ARGSUSED*/
125 void
dtrace_toxic_ranges(void (* func)(uintptr_t base,uintptr_t limit))126 dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit))
127 {
128 printf("IMPLEMENT ME: dtrace_toxic_ranges\n");
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 cpuset_t cpus;
135
136 if (cpu == DTRACE_CPUALL)
137 cpus = all_cpus;
138 else
139 CPU_SETOF(cpu, &cpus);
140
141 smp_rendezvous_cpus(cpus, smp_no_rendevous_barrier, func,
142 smp_no_rendevous_barrier, arg);
143 }
144
145 static void
dtrace_sync_func(void)146 dtrace_sync_func(void)
147 {
148 }
149
150 void
dtrace_sync(void)151 dtrace_sync(void)
152 {
153 dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL);
154 }
155
156 /*
157 * DTrace needs a high resolution time function which can
158 * be called from a probe context and guaranteed not to have
159 * instrumented with probes itself.
160 *
161 * Returns nanoseconds since boot.
162 */
163 uint64_t
dtrace_gethrtime()164 dtrace_gethrtime()
165 {
166 struct timespec curtime;
167
168 nanouptime(&curtime);
169
170 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec);
171
172 }
173
174 uint64_t
dtrace_gethrestime(void)175 dtrace_gethrestime(void)
176 {
177 struct timespec current_time;
178
179 dtrace_getnanotime(¤t_time);
180
181 return (current_time.tv_sec * 1000000000UL + current_time.tv_nsec);
182 }
183
184 /* Function to handle DTrace traps during probes. See amd64/amd64/trap.c */
185 int
dtrace_trap(struct trapframe * frame,u_int type)186 dtrace_trap(struct trapframe *frame, u_int type)
187 {
188 /*
189 * A trap can occur while DTrace executes a probe. Before
190 * executing the probe, DTrace blocks re-scheduling and sets
191 * a flag in it's per-cpu flags to indicate that it doesn't
192 * want to fault. On returning from the probe, the no-fault
193 * flag is cleared and finally re-scheduling is enabled.
194 *
195 * Check if DTrace has enabled 'no-fault' mode:
196 *
197 */
198 if ((cpu_core[curcpu].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT) != 0) {
199 /*
200 * There are only a couple of trap types that are expected.
201 * All the rest will be handled in the usual way.
202 */
203 switch (type) {
204 /* Page fault. */
205 case FAULT_ALIGN:
206 /* Flag a bad address. */
207 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR;
208 cpu_core[curcpu].cpuc_dtrace_illval = 0;
209
210 /*
211 * Offset the instruction pointer to the instruction
212 * following the one causing the fault.
213 */
214 frame->tf_pc += sizeof(int);
215 return (1);
216 default:
217 /* Handle all other traps in the usual way. */
218 break;
219 }
220 }
221
222 /* Handle the trap in the usual way. */
223 return (0);
224 }
225
226 void
dtrace_probe_error(dtrace_state_t * state,dtrace_epid_t epid,int which,int fault,int fltoffs,uintptr_t illval)227 dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which,
228 int fault, int fltoffs, uintptr_t illval)
229 {
230
231 dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state,
232 (uintptr_t)epid,
233 (uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs);
234 }
235
236 static int
dtrace_invop_start(struct trapframe * frame)237 dtrace_invop_start(struct trapframe *frame)
238 {
239 register_t *r0, *sp;
240 int data, invop, reg, update_sp;
241
242 invop = dtrace_invop(frame->tf_pc, (uintptr_t *)frame, frame->tf_pc);
243 switch (invop & DTRACE_INVOP_MASK) {
244 case DTRACE_INVOP_PUSHM:
245 sp = (register_t *)frame->tf_svc_sp;
246 r0 = &frame->tf_r0;
247 data = DTRACE_INVOP_DATA(invop);
248
249 /*
250 * Store the pc, lr, and sp. These have their own
251 * entries in the struct.
252 */
253 if (data & (1 << BIT_PC)) {
254 sp--;
255 *sp = frame->tf_pc;
256 }
257 if (data & (1 << BIT_LR)) {
258 sp--;
259 *sp = frame->tf_svc_lr;
260 }
261 if (data & (1 << BIT_SP)) {
262 sp--;
263 *sp = frame->tf_svc_sp;
264 }
265
266 /* Store the general registers */
267 for (reg = 12; reg >= 0; reg--) {
268 if (data & (1 << reg)) {
269 sp--;
270 *sp = r0[reg];
271 }
272 }
273
274 /* Update the stack pointer and program counter to continue */
275 frame->tf_svc_sp = (register_t)sp;
276 frame->tf_pc += 4;
277 break;
278 case DTRACE_INVOP_POPM:
279 sp = (register_t *)frame->tf_svc_sp;
280 r0 = &frame->tf_r0;
281 data = DTRACE_INVOP_DATA(invop);
282
283 /* Read the general registers */
284 for (reg = 0; reg <= 12; reg++) {
285 if (data & (1 << reg)) {
286 r0[reg] = *sp;
287 sp++;
288 }
289 }
290
291 /*
292 * Set the stack pointer. If we don't update it here we will
293 * need to update it at the end as the instruction would do
294 */
295 update_sp = 1;
296 if (data & (1 << BIT_SP)) {
297 frame->tf_svc_sp = *sp;
298 *sp++;
299 update_sp = 0;
300 }
301
302 /* Update the link register, we need to use the correct copy */
303 if (data & (1 << BIT_LR)) {
304 frame->tf_svc_lr = *sp;
305 *sp++;
306 }
307 /*
308 * And the program counter. If it's not in the list skip over
309 * it when we return so to not hit this again.
310 */
311 if (data & (1 << BIT_PC)) {
312 frame->tf_pc = *sp;
313 *sp++;
314 } else
315 frame->tf_pc += 4;
316
317 /* Update the stack pointer if we haven't already done so */
318 if (update_sp)
319 frame->tf_svc_sp = (register_t)sp;
320 break;
321 case DTRACE_INVOP_B:
322 data = DTRACE_INVOP_DATA(invop) & 0x00ffffff;
323 /* Sign extend the data */
324 if ((data & (1 << 23)) != 0)
325 data |= 0xff000000;
326 /* The data is the number of 4-byte words to change the pc */
327 data *= 4;
328 data += 8;
329 frame->tf_pc += data;
330 break;
331 default:
332 return (-1);
333 break;
334 }
335
336 return (0);
337 }
338
dtrace_invop_init(void)339 void dtrace_invop_init(void)
340 {
341 dtrace_invop_jump_addr = dtrace_invop_start;
342 }
343
dtrace_invop_uninit(void)344 void dtrace_invop_uninit(void)
345 {
346 dtrace_invop_jump_addr = 0;
347 }
348