/*
- * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <machine/machine_routines.h>
vm_offset_t pc_buftomem = 0;
-unsigned int * pc_buffer = 0; /* buffer that holds each pc */
-unsigned int * pc_bufptr = 0;
-unsigned int * pc_buflast = 0;
+unsigned int * pc_buffer = 0; /* buffer that holds each pc */
+unsigned int * pc_bufptr = 0;
+unsigned int * pc_buflast = 0;
unsigned int npcbufs = 8192; /* number of pc entries in buffer */
unsigned int pc_bufsize = 0;
unsigned int pcsample_flags = 0;
int
enable_branch_tracing(void)
{
-#ifndef i386
- struct proc *p;
- if (-1 != pc_sample_pid) {
- p = proc_find(pc_sample_pid);
- if (p) {
- p->p_btrace = 1;
- proc_rele(p);
- }
- }
- else {
- pc_trace_frameworks = TRUE;
- }
-
- return 1;
-
-#else
- return 0;
-#endif
+ struct proc *p;
+ if (-1 != pc_sample_pid) {
+ p = proc_find(pc_sample_pid);
+ if (p) {
+ p->p_btrace = 1;
+ proc_rele(p);
+ }
+ } else {
+ pc_trace_frameworks = TRUE;
+ }
+
+ return 1;
}
int
disable_branch_tracing(void)
{
- struct proc *p;
- switch (pc_sample_pid) {
- case -1:
- pc_trace_frameworks = FALSE;
- break;
- case 0:
- break;
- default:
- p = proc_find(pc_sample_pid);
- if (p) {
- p->p_btrace = 0;
+ struct proc *p;
+ switch (pc_sample_pid) {
+ case -1:
+ pc_trace_frameworks = FALSE;
+ break;
+ case 0:
+ break;
+ default:
+ p = proc_find(pc_sample_pid);
+ if (p) {
+ p->p_btrace = 0;
proc_rele(p);
- }
- break;
- }
- clr_be_bit();
- return 1;
+ }
+ break;
+ }
+ clr_be_bit();
+ return 1;
}
/*
int
branch_tracing_enabled(void)
{
- struct proc *p = current_proc();
- if (TRUE == pc_trace_frameworks) return TRUE;
- if (p) {
- return (p->p_btrace);
- }
- return 0;
+ struct proc *p = current_proc();
+ if (TRUE == pc_trace_frameworks) {
+ return TRUE;
+ }
+ if (p) {
+ return p->p_btrace;
+ }
+ return 0;
}
add_pcbuffer(void)
{
int i;
- unsigned int pc;
-
- if (!pcsample_enable)
- return;
-
- for (i=0; i < pc_trace_cnt; i++)
- {
- pc = pc_trace_buf[i];
-
- if ((pcsample_beg <= pc) && (pc < pcsample_end))
- {
- if (pc_bufptr > pc_buffer)
- {
- if ( (*(pc_bufptr-1)) == pc )
- continue; /* Ignore, probably spinning */
- }
-
- /* Then the sample is in our range */
- *pc_bufptr = pc;
- pc_bufptr++;
- }
- }
+ unsigned int pc;
+
+ if (!pcsample_enable) {
+ return;
+ }
+
+ for (i = 0; i < pc_trace_cnt; i++) {
+ pc = pc_trace_buf[i];
+
+ if ((pcsample_beg <= pc) && (pc < pcsample_end)) {
+ if (pc_bufptr > pc_buffer) {
+ if ((*(pc_bufptr - 1)) == pc) {
+ continue; /* Ignore, probably spinning */
+ }
+ }
+
+ /* Then the sample is in our range */
+ *pc_bufptr = pc;
+ pc_bufptr++;
+ }
+ }
/* We never wrap the buffer */
- if ((pc_bufptr + pc_trace_cnt) >= pc_buflast)
- {
- pcsample_enable = 0;
- (void)disable_branch_tracing();
- wakeup(&pcsample_enable);
- }
+ if ((pc_bufptr + pc_trace_cnt) >= pc_buflast) {
+ pcsample_enable = 0;
+ (void)disable_branch_tracing();
+ wakeup(&pcsample_enable);
+ }
return;
}
int
pcsamples_bootstrap(void)
{
- if (!disable_branch_tracing())
- return(ENOTSUP);
+ if (!disable_branch_tracing()) {
+ return ENOTSUP;
+ }
- pc_bufsize = npcbufs * sizeof(* pc_buffer);
+ pc_bufsize = npcbufs * sizeof(*pc_buffer);
if (kmem_alloc(kernel_map, &pc_buftomem,
- (vm_size_t)pc_bufsize) == KERN_SUCCESS)
- pc_buffer = (unsigned int *) pc_buftomem;
- else
- pc_buffer = NULL;
+ (vm_size_t)pc_bufsize) == KERN_SUCCESS) {
+ pc_buffer = (unsigned int *) pc_buftomem;
+ } else {
+ pc_buffer = NULL;
+ }
if (pc_buffer) {
pc_bufptr = pc_buffer;
pc_buflast = &pc_bufptr[npcbufs];
pcsample_enable = 0;
- return(0);
+ return 0;
} else {
- pc_bufsize=0;
- return(EINVAL);
+ pc_bufsize = 0;
+ return EINVAL;
}
-
}
int
pcsamples_reinit(void)
{
- int ret=0;
+ int ret = 0;
- pcsample_enable = 0;
+ pcsample_enable = 0;
- if (pc_bufsize && pc_buffer)
+ if (pc_bufsize && pc_buffer) {
kmem_free(kernel_map, (vm_offset_t)pc_buffer, pc_bufsize);
+ }
- ret= pcsamples_bootstrap();
- return(ret);
+ ret = pcsamples_bootstrap();
+ return ret;
}
void
pcsamples_clear(void)
{
- /* Clean up the sample buffer, set defaults */
- global_state_pid = -1;
+ /* Clean up the sample buffer, set defaults */
+ global_state_pid = -1;
pcsample_enable = 0;
- if(pc_bufsize && pc_buffer)
- kmem_free(kernel_map, (vm_offset_t)pc_buffer, pc_bufsize);
+ if (pc_bufsize && pc_buffer) {
+ kmem_free(kernel_map, (vm_offset_t)pc_buffer, pc_bufsize);
+ }
pc_buffer = NULL;
pc_bufptr = NULL;
pc_buflast = NULL;
pc_bufsize = 0;
- pcsample_beg= 0;
- pcsample_end= 0;
+ pcsample_beg = 0;
+ pcsample_end = 0;
bzero((void *)pcsample_comm, sizeof(pcsample_comm));
(void)disable_branch_tracing();
pc_sample_pid = 0;
int
pcsamples_control(int *name, __unused u_int namelen, user_addr_t where, size_t *sizep)
{
- int ret=0;
- size_t size=*sizep;
- int value = name[1];
- pcinfo_t pc_bufinfo;
- pid_t *pidcheck;
-
- pid_t curpid;
- struct proc *p, *curproc;
-
- if (name[0] != PCSAMPLE_GETNUMBUF)
- {
- curproc = current_proc();
- if (curproc)
- curpid = curproc->p_pid;
- else
- return (ESRCH);
-
- if (global_state_pid == -1)
- global_state_pid = curpid;
- else if (global_state_pid != curpid)
- {
- if((p = proc_find(global_state_pid)) == NULL)
- {
- /* The global pid no longer exists */
- global_state_pid = curpid;
- }
- else
- {
- proc_rele(p);
- /* The global pid exists, deny this request */
- return(EBUSY);
- }
- }
- }
-
-
- switch(name[0]) {
- case PCSAMPLE_DISABLE: /* used to disable */
- pcsample_enable=0;
- break;
- case PCSAMPLE_SETNUMBUF:
- /* The buffer size is bounded by a min and max number of samples */
- if (value < pc_trace_cnt) {
- ret=EINVAL;
- break;
+ int ret = 0;
+ size_t size = *sizep;
+ int value = name[1];
+ pcinfo_t pc_bufinfo = {};
+ pid_t *pidcheck;
+
+ pid_t curpid;
+ struct proc *p, *curproc;
+
+ if (name[0] != PCSAMPLE_GETNUMBUF) {
+ curproc = current_proc();
+ if (curproc) {
+ curpid = curproc->p_pid;
+ } else {
+ return ESRCH;
+ }
+
+ if (global_state_pid == -1) {
+ global_state_pid = curpid;
+ } else if (global_state_pid != curpid) {
+ if ((p = proc_find(global_state_pid)) == NULL) {
+ /* The global pid no longer exists */
+ global_state_pid = curpid;
+ } else {
+ proc_rele(p);
+ /* The global pid exists, deny this request */
+ return EBUSY;
}
- if (value <= MAX_PCSAMPLES)
- /* npcbufs = value & ~(PC_TRACE_CNT-1); */
- npcbufs = value;
- else
- npcbufs = MAX_PCSAMPLES;
+ }
+ }
+
+
+ switch (name[0]) {
+ case PCSAMPLE_DISABLE: /* used to disable */
+ pcsample_enable = 0;
+ break;
+ case PCSAMPLE_SETNUMBUF:
+ /* The buffer size is bounded by a min and max number of samples */
+ if (value < pc_trace_cnt) {
+ ret = EINVAL;
break;
- case PCSAMPLE_GETNUMBUF:
- if (size < sizeof(pc_bufinfo)) {
- ret=EINVAL;
- break;
- }
- pc_bufinfo.npcbufs = npcbufs;
- pc_bufinfo.bufsize = pc_bufsize;
- pc_bufinfo.enable = pcsample_enable;
- pc_bufinfo.pcsample_beg = pcsample_beg;
- pc_bufinfo.pcsample_end = pcsample_end;
- if(copyout (&pc_bufinfo, where, sizeof(pc_bufinfo)))
- {
- ret=EINVAL;
- }
+ }
+ if (value <= MAX_PCSAMPLES) {
+ /* npcbufs = value & ~(PC_TRACE_CNT-1); */
+ npcbufs = value;
+ } else {
+ npcbufs = MAX_PCSAMPLES;
+ }
+ break;
+ case PCSAMPLE_GETNUMBUF:
+ if (size < sizeof(pc_bufinfo)) {
+ ret = EINVAL;
break;
- case PCSAMPLE_SETUP:
- ret=pcsamples_reinit();
+ }
+ pc_bufinfo.npcbufs = npcbufs;
+ pc_bufinfo.bufsize = pc_bufsize;
+ pc_bufinfo.enable = pcsample_enable;
+ pc_bufinfo.pcsample_beg = pcsample_beg;
+ pc_bufinfo.pcsample_end = pcsample_end;
+ if (copyout(&pc_bufinfo, where, sizeof(pc_bufinfo))) {
+ ret = EINVAL;
+ }
+ break;
+ case PCSAMPLE_SETUP:
+ ret = pcsamples_reinit();
+ break;
+ case PCSAMPLE_REMOVE:
+ pcsamples_clear();
+ break;
+ case PCSAMPLE_READBUF:
+ /* A nonzero value says enable and wait on the buffer */
+ /* A zero value says read up the buffer immediately */
+ if (value == 0) {
+ /* Do not wait on the buffer */
+ pcsample_enable = 0;
+ (void)disable_branch_tracing();
+ ret = pcsamples_read(where, sizep);
break;
- case PCSAMPLE_REMOVE:
- pcsamples_clear();
+ } else if ((pc_bufsize <= 0) || (!pc_buffer)) {
+ /* enable only if buffer is initialized */
+ ret = EINVAL;
break;
- case PCSAMPLE_READBUF:
- /* A nonzero value says enable and wait on the buffer */
- /* A zero value says read up the buffer immediately */
- if (value == 0)
- {
- /* Do not wait on the buffer */
- pcsample_enable = 0;
- (void)disable_branch_tracing();
- ret = pcsamples_read(where, sizep);
- break;
- }
- else if ((pc_bufsize <= 0) || (!pc_buffer))
- {
- /* enable only if buffer is initialized */
- ret=EINVAL;
- break;
- }
+ }
- /* Turn on branch tracing */
- if (!enable_branch_tracing())
- {
- ret = ENOTSUP;
- break;
- }
+ /* Turn on branch tracing */
+ if (!enable_branch_tracing()) {
+ ret = ENOTSUP;
+ break;
+ }
- /* Enable sampling */
- pcsample_enable = 1;
+ /* Enable sampling */
+ pcsample_enable = 1;
- ret = tsleep(&pcsample_enable, PRIBIO | PCATCH, "pcsample", 0);
- pcsample_enable = 0;
- (void)disable_branch_tracing();
+ ret = tsleep(&pcsample_enable, PRIBIO | PCATCH, "pcsample", 0);
+ pcsample_enable = 0;
+ (void)disable_branch_tracing();
- if (ret)
- {
- /* Eventually fix this... if (ret != EINTR) */
- if (ret)
- {
+ if (ret) {
+ /* Eventually fix this... if (ret != EINTR) */
+ if (ret) {
/* On errors, except EINTR, we want to cleanup buffer ptrs */
/* pc_bufptr = pc_buffer; */
*sizep = 0;
- }
- }
- else
- {
- /* The only way to get here is if the buffer is full */
- ret = pcsamples_read(where, sizep);
- }
+ }
+ } else {
+ /* The only way to get here is if the buffer is full */
+ ret = pcsamples_read(where, sizep);
+ }
+
+ break;
+ case PCSAMPLE_SETREG:
+ if (size < sizeof(pc_bufinfo)) {
+ ret = EINVAL;
+ break;
+ }
+ if (copyin(where, &pc_bufinfo, sizeof(pc_bufinfo))) {
+ ret = EINVAL;
+ break;
+ }
+ pcsample_beg = pc_bufinfo.pcsample_beg;
+ pcsample_end = pc_bufinfo.pcsample_end;
+ break;
+ case PCSAMPLE_COMM:
+ if (!(sizeof(pcsample_comm) > size)) {
+ ret = EINVAL;
break;
- case PCSAMPLE_SETREG:
- if (size < sizeof(pc_bufinfo))
- {
- ret = EINVAL;
- break;
- }
- if (copyin(where, &pc_bufinfo, sizeof(pc_bufinfo)))
- {
- ret = EINVAL;
- break;
- }
-
- pcsample_beg = pc_bufinfo.pcsample_beg;
- pcsample_end = pc_bufinfo.pcsample_end;
+ }
+ bzero((void *)pcsample_comm, sizeof(pcsample_comm));
+ if (copyin(where, pcsample_comm, size)) {
+ ret = EINVAL;
+ break;
+ }
+
+ /* Check for command name or pid */
+ if (pcsample_comm[0] != '\0') {
+ ret = ENOTSUP;
break;
- case PCSAMPLE_COMM:
- if (!(sizeof(pcsample_comm) > size))
- {
- ret = EINVAL;
- break;
- }
- bzero((void *)pcsample_comm, sizeof(pcsample_comm));
- if (copyin(where, pcsample_comm, size))
- {
- ret = EINVAL;
- break;
- }
-
- /* Check for command name or pid */
- if (pcsample_comm[0] != '\0')
- {
- ret= ENOTSUP;
- break;
- }
- else
- {
- if (size != (2 * sizeof(pid_t)))
- {
- ret = EINVAL;
- break;
- }
- else
- {
+ } else {
+ if (size != (2 * sizeof(pid_t))) {
+ ret = EINVAL;
+ break;
+ } else {
pidcheck = (pid_t *)pcsample_comm;
pc_sample_pid = pidcheck[1];
- }
- }
- break;
- default:
- ret= ENOTSUP;
- break;
+ }
+ }
+ break;
+ default:
+ ret = ENOTSUP;
+ break;
}
- return(ret);
+ return ret;
}
-/*
- This buffer must be read up in one call.
- If the buffer isn't big enough to hold
- all the samples, it will copy up enough
- to fill the buffer and throw the rest away.
- This buffer never wraps.
-*/
+/*
+ * This buffer must be read up in one call.
+ * If the buffer isn't big enough to hold
+ * all the samples, it will copy up enough
+ * to fill the buffer and throw the rest away.
+ * This buffer never wraps.
+ */
int
pcsamples_read(user_addr_t buffer, size_t *number)
{
- size_t count=0;
- size_t copycount;
-
- count = (*number)/sizeof(* pc_buffer);
-
- if (count && pc_bufsize && pc_buffer)
- {
- copycount = pc_bufptr - pc_buffer;
-
- if (copycount <= 0)
- {
- *number = 0;
- return(0);
+ size_t count = 0;
+ size_t copycount;
+
+ count = (*number) / sizeof(*pc_buffer);
+
+ if (count && pc_bufsize && pc_buffer) {
+ copycount = pc_bufptr - pc_buffer;
+
+ if (copycount <= 0) {
+ *number = 0;
+ return 0;
}
- if (copycount > count)
- copycount = count;
+ if (copycount > count) {
+ copycount = count;
+ }
- /* We actually have data to send up */
- if(copyout(pc_buffer, buffer, copycount * sizeof(* pc_buffer)))
- {
- *number = 0;
- return(EINVAL);
+ /* We actually have data to send up */
+ if (copyout(pc_buffer, buffer, copycount * sizeof(*pc_buffer))) {
+ *number = 0;
+ return EINVAL;
}
- *number = copycount;
- pc_bufptr = pc_buffer;
- return(0);
- }
- else
- {
- *number = 0;
- return(0);
- }
+ *number = copycount;
+ pc_bufptr = pc_buffer;
+ return 0;
+ } else {
+ *number = 0;
+ return 0;
+ }
}
-
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