/*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
*
* @Apple_LICENSE_HEADER_START@
*
* License for the specific language governing rights and limitations
* under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <machine/spl.h>
#include <sys/errno.h>
#include <sys/param.h>
+#include <sys/systm.h>
#include <sys/proc_internal.h>
#include <sys/vm.h>
#include <sys/sysctl.h>
#include <kern/thread.h>
#include <kern/task.h>
+#include <kern/debug.h>
#include <vm/vm_kern.h>
#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/kauth.h>
+
+#include <mach/mach_host.h> /* for host_info() */
+#include <libkern/OSAtomic.h>
+
+/* XXX should have prototypes, but Mach does not provide one */
+void task_act_iterate_wth_args(task_t, void(*)(thread_t, void *), void *);
+int cpu_number(void); /* XXX <machine/...> include path broken */
+
+/* XXX should probably be static, but it's debugging code... */
+int kdbg_read(user_addr_t, size_t *);
+void kdbg_control_chud(int, void *);
+int kdbg_control(int *, u_int, user_addr_t, size_t *);
+int kdbg_getentropy (user_addr_t, size_t *, int);
+int kdbg_readmap(user_addr_t, size_t *);
+int kdbg_getreg(kd_regtype *);
+int kdbg_setreg(kd_regtype *);
+int kdbg_setrtcdec(kd_regtype *);
+int kdbg_setpidex(kd_regtype *);
+int kdbg_setpid(kd_regtype *);
+void kdbg_mapinit(void);
+int kdbg_reinit(void);
+int kdbg_bootstrap(void);
+
+static int create_buffers(void);
+static void delete_buffers(void);
+
+extern void IOSleep(int);
+
+#ifdef ppc
+extern uint32_t maxDec;
+#endif
+
/* trace enable status */
unsigned int kdebug_enable = 0;
unsigned int kdebug_slowcheck=SLOW_NOLOG;
-/* kd_buf kd_buffer[kd_bufsize/sizeof(kd_buf)]; */
-kd_buf * kd_bufptr;
-unsigned int kd_buftomem=0;
-kd_buf * kd_buffer=0;
-kd_buf * kd_buflast;
-kd_buf * kd_readlast;
+unsigned int kd_cpus;
+
+struct kd_bufinfo {
+ kd_buf * kd_stop;
+ kd_buf * kd_bufptr;
+ kd_buf * kd_buffer;
+ kd_buf * kd_buflast;
+ kd_buf * kd_readlast;
+ int kd_wrapped; /* plus, the global flag KDBG_WRAPPED is set if one of the buffers has wrapped */
+ uint64_t kd_prev_timebase;
+ int kd_pad[24]; /* pad out to 128 bytes so that no cache line is shared between CPUs */
+
+};
+
+struct kd_bufinfo *kdbip = NULL;
+
+#define KDCOPYBUF_COUNT 1024
+#define KDCOPYBUF_SIZE (KDCOPYBUF_COUNT * sizeof(kd_buf))
+kd_buf *kdcopybuf = NULL;
+
+
unsigned int nkdbufs = 8192;
unsigned int kd_bufsize = 0;
unsigned int kdebug_flags = 0;
unsigned int kdlog_value3=0;
unsigned int kdlog_value4=0;
-unsigned long long kd_prev_timebase = 0LL;
+static lck_mtx_t * kd_trace_mtx_sysctl;
+static lck_grp_t * kd_trace_mtx_sysctl_grp;
+static lck_attr_t * kd_trace_mtx_sysctl_attr;
+static lck_grp_attr_t *kd_trace_mtx_sysctl_grp_attr;
+
+static lck_grp_t *stackshot_subsys_lck_grp;
+static lck_grp_attr_t *stackshot_subsys_lck_grp_attr;
+static lck_attr_t *stackshot_subsys_lck_attr;
+static lck_mtx_t stackshot_subsys_mutex;
+
+void *stackshot_snapbuf = NULL;
+
+int
+stack_snapshot2(pid_t pid, user_addr_t tracebuf, uint32_t tracebuf_size, uint32_t options, register_t *retval);
-static lck_mtx_t * kd_trace_mtx;
-static lck_grp_t * kd_trace_mtx_grp;
-static lck_attr_t * kd_trace_mtx_attr;
-static lck_grp_attr_t *kd_trace_mtx_grp_attr;
+extern void
+kdp_snapshot_preflight(int pid, void *tracebuf, uint32_t tracebuf_size, uint32_t options);
-static lck_spin_t * kd_trace_lock;
-static lck_grp_t * kd_trace_lock_grp;
-static lck_attr_t * kd_trace_lock_attr;
-static lck_grp_attr_t *kd_trace_lock_grp_attr;
+extern int
+kdp_stack_snapshot_geterror(void);
+extern unsigned int
+kdp_stack_snapshot_bytes_traced(void);
kd_threadmap *kd_mapptr = 0;
unsigned int kd_mapsize = 0;
#define DBG_FUNC_MASK 0xfffffffc
-#ifdef ppc
-extern natural_t rtclock_decrementer_min;
-#endif /* ppc */
-
/* task to string structure */
struct tts
{
- task_t *task; /* from procs task */
+ task_t task; /* from procs task */
pid_t pid; /* from procs p_pid */
char task_comm[20]; /* from procs p_comm */
};
kd_chudhook_fn kdebug_chudhook = 0; /* pointer to CHUD toolkit function */
+__private_extern__ void stackshot_lock_init( void ) __attribute__((section("__TEXT, initcode")));
/* Support syscall SYS_kdebug_trace */
-kdebug_trace(p, uap, retval)
- struct proc *p;
- struct kdebug_trace_args *uap;
- register_t *retval;
+int
+kdebug_trace(__unused struct proc *p, struct kdebug_trace_args *uap, __unused register_t *retval)
{
if ( (kdebug_enable == 0) )
return(EINVAL);
return(0);
}
+static int
+create_buffers(void)
+{
+ unsigned int cpu, i;
+ int nentries;
+
+ nentries = nkdbufs / kd_cpus;
+ nkdbufs = nentries * kd_cpus;
-void
-kernel_debug(debugid, arg1, arg2, arg3, arg4, arg5)
-unsigned int debugid, arg1, arg2, arg3, arg4, arg5;
+ kd_bufsize = nentries * sizeof(kd_buf);
+
+ bzero((char *)kdbip, sizeof(struct kd_bufinfo) * kd_cpus);
+
+ if (kdcopybuf == 0) {
+ if (kmem_alloc(kernel_map, (unsigned int *)&kdcopybuf, (vm_size_t)KDCOPYBUF_SIZE) != KERN_SUCCESS)
+ return(ENOMEM);
+ }
+ for (cpu = 0; cpu < kd_cpus; cpu++) {
+ if (kmem_alloc(kernel_map, (unsigned int *)&kdbip[cpu].kd_buffer, kd_bufsize) != KERN_SUCCESS)
+ break;
+ }
+ if (cpu < kd_cpus) {
+ for (i = 0; i < cpu; i++)
+ kmem_free(kernel_map, (vm_offset_t)kdbip[i].kd_buffer, kd_bufsize);
+ kd_bufsize = 0;
+
+ kmem_free(kernel_map, (vm_offset_t)kdcopybuf, KDCOPYBUF_SIZE);
+ kdcopybuf = NULL;
+
+ return(ENOMEM);
+ }
+ for (cpu = 0; cpu < kd_cpus; cpu++) {
+ kdbip[cpu].kd_bufptr = kdbip[cpu].kd_buffer;
+ kdbip[cpu].kd_buflast = &kdbip[cpu].kd_bufptr[nentries];
+ kdbip[cpu].kd_readlast = kdbip[cpu].kd_bufptr;
+ }
+ kdebug_flags |= KDBG_BUFINIT;
+
+ return(0);
+}
+
+
+static void
+delete_buffers(void)
{
+ unsigned int cpu;
+
+ if (kd_bufsize && (kdebug_flags & KDBG_BUFINIT)) {
+ for (cpu = 0; cpu < kd_cpus; cpu++)
+ kmem_free(kernel_map, (vm_offset_t)kdbip[cpu].kd_buffer, kd_bufsize);
+ kd_bufsize = 0;
+ }
+ if (kdcopybuf) {
+ kmem_free(kernel_map, (vm_offset_t)kdcopybuf, KDCOPYBUF_SIZE);
+ kdcopybuf = NULL;
+ }
+ kdebug_flags &= ~KDBG_BUFINIT;
+}
+
+
+static void
+kernel_debug_internal(unsigned int debugid, unsigned int arg1, unsigned int arg2, unsigned int arg3,
+ unsigned int arg4, unsigned int arg5, int entropy_flag)
+{
+ int s;
kd_buf * kd;
struct proc *curproc;
- int s;
unsigned long long now;
+ int cpu;
+
+ s = ml_set_interrupts_enabled(FALSE);
+ now = mach_absolute_time() & KDBG_TIMESTAMP_MASK;
+ cpu = cpu_number();
if (kdebug_enable & KDEBUG_ENABLE_CHUD) {
if (kdebug_chudhook)
kdebug_chudhook(debugid, arg1, arg2, arg3, arg4, arg5);
if ( !(kdebug_enable & (KDEBUG_ENABLE_ENTROPY | KDEBUG_ENABLE_TRACE)))
- return;
+ goto out;
}
- s = ml_set_interrupts_enabled(FALSE);
- lck_spin_lock(kd_trace_lock);
if (kdebug_slowcheck == 0)
goto record_trace;
- if (kdebug_enable & KDEBUG_ENABLE_ENTROPY)
+ if (entropy_flag && (kdebug_enable & KDEBUG_ENABLE_ENTROPY))
{
if (kd_entropy_indx < kd_entropy_count)
{
}
if ( (kdebug_slowcheck & SLOW_NOLOG) )
- {
- lck_spin_unlock(kd_trace_lock);
- ml_set_interrupts_enabled(s);
- return;
- }
+ goto out;
if (kdebug_flags & KDBG_PIDCHECK)
{
/* If kdebug flag is not set for current proc, return */
curproc = current_proc();
- if ((curproc && !(curproc->p_flag & P_KDEBUG)) &&
+ if ((curproc && !(curproc->p_kdebug)) &&
((debugid&0xffff0000) != (MACHDBG_CODE(DBG_MACH_SCHED, 0) | DBG_FUNC_NONE)))
- {
- lck_spin_unlock(kd_trace_lock);
- ml_set_interrupts_enabled(s);
- return;
- }
+ goto out;
}
else if (kdebug_flags & KDBG_PIDEXCLUDE)
{
/* If kdebug flag is set for current proc, return */
curproc = current_proc();
- if ((curproc && (curproc->p_flag & P_KDEBUG)) &&
+ if ((curproc && curproc->p_kdebug) &&
((debugid&0xffff0000) != (MACHDBG_CODE(DBG_MACH_SCHED, 0) | DBG_FUNC_NONE)))
- {
- lck_spin_unlock(kd_trace_lock);
- ml_set_interrupts_enabled(s);
- return;
- }
+ goto out;
}
if (kdebug_flags & KDBG_RANGECHECK)
{
- if ((debugid < kdlog_beg) || (debugid >= kdlog_end)
- && (debugid >> 24 != DBG_TRACE))
- {
- lck_spin_unlock(kd_trace_lock);
- ml_set_interrupts_enabled(s);
- return;
- }
+ if ((debugid < kdlog_beg)
+ || ((debugid >= kdlog_end) && (debugid >> 24 != DBG_TRACE)))
+ goto out;
}
else if (kdebug_flags & KDBG_VALCHECK)
{
(debugid & DBG_FUNC_MASK) != kdlog_value3 &&
(debugid & DBG_FUNC_MASK) != kdlog_value4 &&
(debugid >> 24 != DBG_TRACE))
- {
- lck_spin_unlock(kd_trace_lock);
- ml_set_interrupts_enabled(s);
- return;
- }
+ goto out;
}
record_trace:
- kd = kd_bufptr;
+ kd = kdbip[cpu].kd_bufptr;
kd->debugid = debugid;
kd->arg1 = arg1;
kd->arg2 = arg2;
kd->arg3 = arg3;
kd->arg4 = arg4;
- kd->arg5 = (int)current_thread();
+ kd->arg5 = arg5;
- now = mach_absolute_time() & KDBG_TIMESTAMP_MASK;
-
- /* Watch for out of order timestamps */
-
- if (now < kd_prev_timebase)
+ /*
+ * Watch for out of order timestamps
+ */
+ if (now < kdbip[cpu].kd_prev_timebase)
{
- now = ++kd_prev_timebase & KDBG_TIMESTAMP_MASK;
+ /*
+ * if so, just store the previous timestamp + a cycle
+ */
+ now = ++kdbip[cpu].kd_prev_timebase & KDBG_TIMESTAMP_MASK;
}
else
{
- /* Then just store the previous timestamp */
- kd_prev_timebase = now;
+ kdbip[cpu].kd_prev_timebase = now;
}
- kd->timestamp = now | (((uint64_t)cpu_number()) << KDBG_CPU_SHIFT);
+ kd->timestamp = now | (((uint64_t)cpu) << KDBG_CPU_SHIFT);
+
+ kdbip[cpu].kd_bufptr++;
- kd_bufptr++;
+ if (kdbip[cpu].kd_bufptr >= kdbip[cpu].kd_buflast)
+ kdbip[cpu].kd_bufptr = kdbip[cpu].kd_buffer;
- if (kd_bufptr >= kd_buflast)
- kd_bufptr = kd_buffer;
- if (kd_bufptr == kd_readlast) {
+ if (kdbip[cpu].kd_bufptr == kdbip[cpu].kd_readlast) {
if (kdebug_flags & KDBG_NOWRAP)
kdebug_slowcheck |= SLOW_NOLOG;
+ kdbip[cpu].kd_wrapped = 1;
kdebug_flags |= KDBG_WRAPPED;
}
- lck_spin_unlock(kd_trace_lock);
+
+out:
ml_set_interrupts_enabled(s);
}
void
-kernel_debug1(debugid, arg1, arg2, arg3, arg4, arg5)
-unsigned int debugid, arg1, arg2, arg3, arg4, arg5;
+kernel_debug(unsigned int debugid, unsigned int arg1, unsigned int arg2, unsigned int arg3,
+ unsigned int arg4, __unused unsigned int arg5)
{
- kd_buf * kd;
- struct proc *curproc;
- int s;
- unsigned long long now;
-
- if (kdebug_enable & KDEBUG_ENABLE_CHUD) {
- if (kdebug_chudhook)
- (void)kdebug_chudhook(debugid, arg1, arg2, arg3, arg4, arg5);
-
- if ( !(kdebug_enable & (KDEBUG_ENABLE_ENTROPY | KDEBUG_ENABLE_TRACE)))
- return;
- }
- s = ml_set_interrupts_enabled(FALSE);
- lck_spin_lock(kd_trace_lock);
-
- if (kdebug_slowcheck == 0)
- goto record_trace1;
+ kernel_debug_internal(debugid, arg1, arg2, arg3, arg4, (int)current_thread(), 1);
+}
- if ( (kdebug_slowcheck & SLOW_NOLOG) )
- {
- lck_spin_unlock(kd_trace_lock);
- ml_set_interrupts_enabled(s);
- return;
- }
+void
+kernel_debug1(unsigned int debugid, unsigned int arg1, unsigned int arg2, unsigned int arg3,
+ unsigned int arg4, unsigned int arg5)
+{
+ kernel_debug_internal(debugid, arg1, arg2, arg3, arg4, arg5, 0);
+}
- if (kdebug_flags & KDBG_PIDCHECK)
- {
- /* If kdebug flag is not set for current proc, return */
- curproc = current_proc();
- if ((curproc && !(curproc->p_flag & P_KDEBUG)) &&
- ((debugid&0xffff0000) != (MACHDBG_CODE(DBG_MACH_SCHED, 0) | DBG_FUNC_NONE)))
- {
- lck_spin_unlock(kd_trace_lock);
- ml_set_interrupts_enabled(s);
- return;
- }
- }
- else if (kdebug_flags & KDBG_PIDEXCLUDE)
- {
- /* If kdebug flag is set for current proc, return */
- curproc = current_proc();
- if ((curproc && (curproc->p_flag & P_KDEBUG)) &&
- ((debugid&0xffff0000) != (MACHDBG_CODE(DBG_MACH_SCHED, 0) | DBG_FUNC_NONE)))
- {
- lck_spin_unlock(kd_trace_lock);
- ml_set_interrupts_enabled(s);
- return;
- }
- }
+static void
+kdbg_lock_init(void)
+{
+ host_basic_info_data_t hinfo;
+ mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
- if (kdebug_flags & KDBG_RANGECHECK)
- {
- if ((debugid < kdlog_beg) || (debugid >= kdlog_end)
- && (debugid >> 24 != DBG_TRACE))
- {
- lck_spin_unlock(kd_trace_lock);
- ml_set_interrupts_enabled(s);
+ if (kdebug_flags & KDBG_LOCKINIT)
return;
- }
- }
- else if (kdebug_flags & KDBG_VALCHECK)
- {
- if ((debugid & DBG_FUNC_MASK) != kdlog_value1 &&
- (debugid & DBG_FUNC_MASK) != kdlog_value2 &&
- (debugid & DBG_FUNC_MASK) != kdlog_value3 &&
- (debugid & DBG_FUNC_MASK) != kdlog_value4 &&
- (debugid >> 24 != DBG_TRACE))
- {
- lck_spin_unlock(kd_trace_lock);
- ml_set_interrupts_enabled(s);
- return;
- }
- }
-
-record_trace1:
- kd = kd_bufptr;
- kd->debugid = debugid;
- kd->arg1 = arg1;
- kd->arg2 = arg2;
- kd->arg3 = arg3;
- kd->arg4 = arg4;
- kd->arg5 = arg5;
-
- now = mach_absolute_time() & KDBG_TIMESTAMP_MASK;
-
- /* Watch for out of order timestamps */
-
- if (now < kd_prev_timebase)
- {
- now = ++kd_prev_timebase & KDBG_TIMESTAMP_MASK;
- }
- else
- {
- /* Then just store the previous timestamp */
- kd_prev_timebase = now;
- }
- kd->timestamp = now | (((uint64_t)cpu_number()) << KDBG_CPU_SHIFT);
-
- kd_bufptr++;
-
- if (kd_bufptr >= kd_buflast)
- kd_bufptr = kd_buffer;
- if (kd_bufptr == kd_readlast) {
- if (kdebug_flags & KDBG_NOWRAP)
- kdebug_slowcheck |= SLOW_NOLOG;
- kdebug_flags |= KDBG_WRAPPED;
- }
- lck_spin_unlock(kd_trace_lock);
- ml_set_interrupts_enabled(s);
-}
+ /* get the number of cpus and cache it */
+#define BSD_HOST 1
+ host_info((host_t)BSD_HOST, HOST_BASIC_INFO, (host_info_t)&hinfo, &count);
+ kd_cpus = hinfo.logical_cpu_max;
-static void
-kdbg_lock_init()
-{
+ if (kmem_alloc(kernel_map, (unsigned int *)&kdbip,
+ sizeof(struct kd_bufinfo) * kd_cpus) != KERN_SUCCESS)
+ return;
- if (kdebug_flags & KDBG_LOCKINIT)
- return;
- /*
+ /*
* allocate lock group attribute and group
*/
- kd_trace_lock_grp_attr = lck_grp_attr_alloc_init();
- //lck_grp_attr_setstat(kd_trace_lock_grp_attr);
- kd_trace_lock_grp = lck_grp_alloc_init("kdebug", kd_trace_lock_grp_attr);
-
- kd_trace_mtx_grp_attr = lck_grp_attr_alloc_init();
- //lck_grp_attr_setstat(kd_trace_mtx_grp_attr);
- kd_trace_mtx_grp = lck_grp_alloc_init("kdebug", kd_trace_mtx_grp_attr);
+ kd_trace_mtx_sysctl_grp_attr = lck_grp_attr_alloc_init();
+ kd_trace_mtx_sysctl_grp = lck_grp_alloc_init("kdebug", kd_trace_mtx_sysctl_grp_attr);
/*
* allocate the lock attribute
*/
- kd_trace_lock_attr = lck_attr_alloc_init();
- //lck_attr_setdebug(kd_trace_lock_attr);
-
- kd_trace_mtx_attr = lck_attr_alloc_init();
- //lck_attr_setdebug(kd_trace_mtx_attr);
+ kd_trace_mtx_sysctl_attr = lck_attr_alloc_init();
/*
* allocate and initialize spin lock and mutex
*/
- kd_trace_lock = lck_spin_alloc_init(kd_trace_lock_grp, kd_trace_lock_attr);
- kd_trace_mtx = lck_mtx_alloc_init(kd_trace_mtx_grp, kd_trace_mtx_attr);
+ kd_trace_mtx_sysctl = lck_mtx_alloc_init(kd_trace_mtx_sysctl_grp, kd_trace_mtx_sysctl_attr);
kdebug_flags |= KDBG_LOCKINIT;
}
int
-kdbg_bootstrap()
+kdbg_bootstrap(void)
{
+ kdebug_flags &= ~KDBG_WRAPPED;
- kd_bufsize = nkdbufs * sizeof(kd_buf);
-
- if (kmem_alloc(kernel_map, &kd_buftomem,
- (vm_size_t)kd_bufsize) == KERN_SUCCESS)
- kd_buffer = (kd_buf *) kd_buftomem;
- else
- kd_buffer= (kd_buf *) 0;
- kdebug_flags &= ~KDBG_WRAPPED;
-
- if (kd_buffer) {
- kdebug_flags |= (KDBG_INIT | KDBG_BUFINIT);
- kd_bufptr = kd_buffer;
- kd_buflast = &kd_bufptr[nkdbufs];
- kd_readlast = kd_bufptr;
- kd_prev_timebase = 0LL;
- return(0);
- } else {
- kd_bufsize=0;
- kdebug_flags &= ~(KDBG_INIT | KDBG_BUFINIT);
- return(EINVAL);
- }
-
+ return (create_buffers());
}
-kdbg_reinit()
+int
+kdbg_reinit(void)
{
- int s;
int ret=0;
/*
* First make sure we're not in
* the middle of cutting a trace
*/
- s = ml_set_interrupts_enabled(FALSE);
- lck_spin_lock(kd_trace_lock);
kdebug_enable &= ~KDEBUG_ENABLE_TRACE;
kdebug_slowcheck |= SLOW_NOLOG;
- lck_spin_unlock(kd_trace_lock);
- ml_set_interrupts_enabled(s);
+ /*
+ * make sure the SLOW_NOLOG is seen
+ * by everyone that might be trying
+ * to cut a trace..
+ */
+ IOSleep(100);
- if ((kdebug_flags & KDBG_INIT) && (kdebug_flags & KDBG_BUFINIT) && kd_bufsize && kd_buffer)
- kmem_free(kernel_map, (vm_offset_t)kd_buffer, kd_bufsize);
+ delete_buffers();
if ((kdebug_flags & KDBG_MAPINIT) && kd_mapsize && kd_mapptr)
{
kd_mapcount = 0;
}
- ret= kdbg_bootstrap();
+ ret = kdbg_bootstrap();
return(ret);
}
-void kdbg_trace_data(struct proc *proc, long *arg_pid)
+void
+kdbg_trace_data(struct proc *proc, long *arg_pid)
{
if (!proc)
*arg_pid = 0;
}
-void kdbg_trace_string(struct proc *proc, long *arg1, long *arg2, long *arg3, long *arg4)
+void
+kdbg_trace_string(struct proc *proc, long *arg1, long *arg2, long *arg3, long *arg4)
{
- int i;
char *dbg_nameptr;
int dbg_namelen;
long dbg_parms[4];
-
if (!proc)
{
*arg1 = 0;
dbg_parms[2]=0L;
dbg_parms[3]=0L;
- if(dbg_namelen > sizeof(dbg_parms))
+ if(dbg_namelen > (int)sizeof(dbg_parms))
dbg_namelen = sizeof(dbg_parms);
- for(i=0;dbg_namelen > 0; i++)
- {
- dbg_parms[i]=*(long*)dbg_nameptr;
- dbg_nameptr += sizeof(long);
- dbg_namelen -= sizeof(long);
- }
+ strncpy((char *)dbg_parms, dbg_nameptr, dbg_namelen);
*arg1=dbg_parms[0];
*arg2=dbg_parms[1];
}
static void
-kdbg_resolve_map(thread_t th_act, krt_t *t)
+kdbg_resolve_map(thread_t th_act, void *opaque)
{
kd_threadmap *mapptr;
+ krt_t *t = (krt_t *)opaque;
if(t->count < t->maxcount)
{
mapptr=&t->map[t->count];
mapptr->thread = (unsigned int)th_act;
- (void) strncpy (mapptr->command, t->atts->task_comm,
- sizeof(t->atts->task_comm)-1);
- mapptr->command[sizeof(t->atts->task_comm)-1] = '\0';
+ (void) strlcpy (mapptr->command, t->atts->task_comm,
+ sizeof(t->atts->task_comm));
/*
Some kernel threads have no associated pid.
}
}
-void kdbg_mapinit()
+void
+kdbg_mapinit(void)
{
struct proc *p;
struct krt akrt;
if (kdebug_flags & KDBG_MAPINIT)
return;
+ /* need to use PROC_SCANPROCLIST with proc_iterate */
+ proc_list_lock();
+
/* Calculate the sizes of map buffers*/
for (p = allproc.lh_first, kd_mapcount=0, tts_count=0; p;
p = p->p_list.le_next)
tts_count++;
}
+ proc_list_unlock();
+
/*
* The proc count could change during buffer allocation,
* so introduce a small fudge factor to bump up the
*/
if (tts_mapptr) {
+ /* should use proc_iterate */
+ proc_list_lock();
+
for (p = allproc.lh_first, i=0; p && i < tts_count;
p = p->p_list.le_next) {
- if (p->p_flag & P_WEXIT)
+ if (p->p_lflag & P_LEXIT)
continue;
if (p->task) {
task_reference(p->task);
tts_mapptr[i].task = p->task;
tts_mapptr[i].pid = p->p_pid;
- (void)strncpy(&tts_mapptr[i].task_comm, p->p_comm, sizeof(tts_mapptr[i].task_comm) - 1);
+ (void)strlcpy(tts_mapptr[i].task_comm, p->p_comm, sizeof(tts_mapptr[i].task_comm));
i++;
}
}
tts_count = i;
+
+ proc_list_unlock();
+
}
static void
kdbg_clear(void)
{
- int s;
-
/*
* Clean up the trace buffer
* First make sure we're not in
* the middle of cutting a trace
*/
- s = ml_set_interrupts_enabled(FALSE);
- lck_spin_lock(kd_trace_lock);
kdebug_enable &= ~KDEBUG_ENABLE_TRACE;
kdebug_slowcheck = SLOW_NOLOG;
+ /*
+ * make sure the SLOW_NOLOG is seen
+ * by everyone that might be trying
+ * to cut a trace..
+ */
+ IOSleep(100);
+
if (kdebug_enable & KDEBUG_ENABLE_ENTROPY)
kdebug_slowcheck |= SLOW_ENTROPY;
- lck_spin_unlock(kd_trace_lock);
- ml_set_interrupts_enabled(s);
-
global_state_pid = -1;
- kdebug_flags &= ~KDBG_BUFINIT;
kdebug_flags &= (unsigned int)~KDBG_CKTYPES;
kdebug_flags &= ~(KDBG_NOWRAP | KDBG_RANGECHECK | KDBG_VALCHECK);
kdebug_flags &= ~(KDBG_PIDCHECK | KDBG_PIDEXCLUDE);
- kmem_free(kernel_map, (vm_offset_t)kd_buffer, kd_bufsize);
- kd_buffer = (kd_buf *)0;
- kd_bufsize = 0;
- kd_prev_timebase = 0LL;
+
+ delete_buffers();
/* Clean up the thread map buffer */
kdebug_flags &= ~KDBG_MAPINIT;
kd_mapcount = 0;
}
+int
kdbg_setpid(kd_regtype *kdr)
{
pid_t pid;
if (pid > 0)
{
- if ((p = pfind(pid)) == NULL)
+ if ((p = proc_find(pid)) == NULL)
ret = ESRCH;
else
{
kdebug_flags &= ~KDBG_PIDEXCLUDE;
kdebug_slowcheck |= SLOW_CHECKS;
- p->p_flag |= P_KDEBUG;
+ p->p_kdebug = 1;
}
else /* turn off pid check for this pid value */
{
/* Don't turn off all pid checking though */
/* kdebug_flags &= ~KDBG_PIDCHECK;*/
- p->p_flag &= ~P_KDEBUG;
+ p->p_kdebug = 0;
}
+ proc_rele(p);
}
}
else
}
/* This is for pid exclusion in the trace buffer */
+int
kdbg_setpidex(kd_regtype *kdr)
{
pid_t pid;
if (pid > 0)
{
- if ((p = pfind(pid)) == NULL)
+ if ((p = proc_find(pid)) == NULL)
ret = ESRCH;
else
{
kdebug_flags &= ~KDBG_PIDCHECK;
kdebug_slowcheck |= SLOW_CHECKS;
- p->p_flag |= P_KDEBUG;
+ p->p_kdebug = 1;
}
else /* turn off pid exclusion for this pid value */
{
/* Don't turn off all pid exclusion though */
/* kdebug_flags &= ~KDBG_PIDEXCLUDE;*/
- p->p_flag &= ~P_KDEBUG;
+ p->p_kdebug = 0;
}
+ proc_rele(p);
}
}
else
return(ret);
}
-/* This is for setting a minimum decrementer value */
+/* This is for setting a maximum decrementer value */
+int
kdbg_setrtcdec(kd_regtype *kdr)
{
int ret=0;
decval = (natural_t)kdr->value1;
if (decval && decval < KDBG_MINRTCDEC)
- ret = EINVAL;
+ ret = EINVAL;
#ifdef ppc
- else
- rtclock_decrementer_min = decval;
+ else {
+ maxDec = decval ? decval : 0x7FFFFFFF; /* Set or reset the max decrementer */
+ }
#else
- else
- ret = ENOTSUP;
+ else
+ ret = ENOTSUP;
#endif /* ppc */
return(ret);
}
+int
kdbg_setreg(kd_regtype * kdr)
{
- int i,j, ret=0;
+ int ret=0;
unsigned int val_1, val_2, val;
switch (kdr->type) {
return(ret);
}
-kdbg_getreg(kd_regtype * kdr)
+int
+kdbg_getreg(__unused kd_regtype * kdr)
{
+#if 0
int i,j, ret=0;
unsigned int val_1, val_2, val;
-#if 0
+
switch (kdr->type) {
case KDBG_CLASSTYPE :
val_1 = (kdr->value1 & 0xff);
{
int avail = *number;
int ret = 0;
- int count = 0;
+ unsigned int count = 0;
count = avail/sizeof (kd_threadmap);
{
int avail = *number;
int ret = 0;
- int count = 0; /* The number of timestamp entries that will fill buffer */
if (kd_entropy_buffer)
return(EBUSY);
}
+static void
+kdbg_set_nkdbufs(unsigned int value)
+{
+ /*
+ * We allow a maximum buffer size of 25% of either ram or max mapped address, whichever is smaller
+ * 'value' is the desired number of trace entries
+ */
+ unsigned int max_entries = (sane_size/4) / sizeof(kd_buf);
+
+ if (value <= max_entries)
+ nkdbufs = value;
+ else
+ nkdbufs = max_entries;
+}
+
+
/*
* This function is provided for the CHUD toolkit only.
* int val:
* address of the enabled kdebug_chudhook function
*/
-void kdbg_control_chud(int val, void *fn)
+void
+kdbg_control_chud(int val, void *fn)
{
if (val) {
/* enable chudhook */
}
+int
kdbg_control(int *name, u_int namelen, user_addr_t where, size_t *sizep)
{
- int ret=0;
- int size=*sizep;
- int max_entries;
- unsigned int value = name[1];
+ int ret=0;
+ size_t size=*sizep;
+ unsigned int value = 0;
kd_regtype kd_Reg;
kbufinfo_t kd_bufinfo;
pid_t curpid;
struct proc *p, *curproc;
-
+ if (name[0] == KERN_KDGETENTROPY ||
+ name[0] == KERN_KDEFLAGS ||
+ name[0] == KERN_KDDFLAGS ||
+ name[0] == KERN_KDENABLE ||
+ name[0] == KERN_KDSETBUF) {
+
+ if ( namelen < 2 )
+ return(EINVAL);
+ value = name[1];
+ }
+
kdbg_lock_init();
- lck_mtx_lock(kd_trace_mtx);
+
+ if ( !(kdebug_flags & KDBG_LOCKINIT))
+ return(ENOMEM);
+
+ lck_mtx_lock(kd_trace_mtx_sysctl);
if (name[0] == KERN_KDGETBUF) {
/*
* There is not enough room to return even
* the first element of the info structure.
*/
- lck_mtx_unlock(kd_trace_mtx);
+ lck_mtx_unlock(kd_trace_mtx_sysctl);
return(EINVAL);
}
* Provide all the info we have
*/
if (copyout (&kd_bufinfo, where, sizeof(kd_bufinfo))) {
- lck_mtx_unlock(kd_trace_mtx);
+ lck_mtx_unlock(kd_trace_mtx_sysctl);
return(EINVAL);
}
* as much info as there is room for.
*/
if (copyout (&kd_bufinfo, where, size)) {
- lck_mtx_unlock(kd_trace_mtx);
+ lck_mtx_unlock(kd_trace_mtx_sysctl);
return(EINVAL);
}
}
- lck_mtx_unlock(kd_trace_mtx);
+ lck_mtx_unlock(kd_trace_mtx_sysctl);
return(0);
} else if (name[0] == KERN_KDGETENTROPY) {
ret = EBUSY;
else
ret = kdbg_getentropy(where, sizep, value);
- lck_mtx_unlock(kd_trace_mtx);
+ lck_mtx_unlock(kd_trace_mtx_sysctl);
return (ret);
}
- if (curproc = current_proc())
+ if ((curproc = current_proc()) != NULL)
curpid = curproc->p_pid;
else {
- lck_mtx_unlock(kd_trace_mtx);
+ lck_mtx_unlock(kd_trace_mtx_sysctl);
return (ESRCH);
}
if (global_state_pid == -1)
global_state_pid = curpid;
else if (global_state_pid != curpid) {
- if ((p = pfind(global_state_pid)) == NULL) {
+ if ((p = proc_find(global_state_pid)) == NULL) {
/*
* The global pid no longer exists
*/
/*
* The global pid exists, deny this request
*/
- lck_mtx_unlock(kd_trace_mtx);
+ proc_rele(p);
+ lck_mtx_unlock(kd_trace_mtx_sysctl);
return(EBUSY);
}
ret=EINVAL;
break;
}
+ kdbg_mapinit();
+
kdebug_enable |= KDEBUG_ENABLE_TRACE;
kdebug_slowcheck &= ~SLOW_NOLOG;
}
kdebug_enable &= ~KDEBUG_ENABLE_TRACE;
kdebug_slowcheck |= SLOW_NOLOG;
}
- kdbg_mapinit();
break;
case KERN_KDSETBUF:
- /* We allow a maximum buffer size of 25% of either ram or max mapped address, whichever is smaller */
- /* 'value' is the desired number of trace entries */
- max_entries = (sane_size/4) / sizeof(kd_buf);
- if (value <= max_entries)
- nkdbufs = value;
- else
- nkdbufs = max_entries;
+ kdbg_set_nkdbufs(value);
break;
case KERN_KDSETUP:
ret=kdbg_reinit();
default:
ret= EINVAL;
}
- lck_mtx_unlock(kd_trace_mtx);
+ lck_mtx_unlock(kd_trace_mtx_sysctl);
return(ret);
}
+
+/*
+ * This code can run concurrently with kernel_debug_internal()
+ * without the need of any locks, because all reads of kd_bufptr[i],
+ * which get modified by kernel_debug_internal(), are safe.
+ */
+int
kdbg_read(user_addr_t buffer, size_t *number)
{
-int avail=*number;
-int count=0;
-int copycount=0;
-int totalcount=0;
-int s;
-unsigned int my_kdebug_flags;
-kd_buf * my_kd_bufptr;
+ unsigned int count;
+ unsigned int cpu;
+ int mincpu;
+ uint64_t mintime, t, last_wrap_time;
+ int last_wrap_cpu;
+ int error = 0;
+ kd_buf *tempbuf;
+ uint32_t tempbuf_count;
+ uint32_t tempbuf_number;
+ unsigned int old_kdebug_flags, new_kdebug_flags;
+ unsigned int old_kdebug_slowcheck, new_kdebug_slowcheck;
+ boolean_t first_event = TRUE;
+
+ count = *number/sizeof(kd_buf);
+ *number = 0;
+
+ if (count == 0 || !(kdebug_flags & KDBG_BUFINIT) || kdcopybuf == 0)
+ return EINVAL;
- s = ml_set_interrupts_enabled(FALSE);
- lck_spin_lock(kd_trace_lock);
+ /*
+ * because we hold kd_trace_mtx_sysctl, no other control threads can
+ * be playing with kdebug_flags... the code that cuts new events could
+ * be running, but it only reads kdebug_flags, it doesn't write it..
+ * use an OSCompareAndSwap to make sure the other processors see the
+ * change of state immediately, not to protect against 2 threads racing to update it
+ */
+ old_kdebug_slowcheck = kdebug_slowcheck;
+ do {
+ old_kdebug_flags = kdebug_flags;
+ new_kdebug_flags = old_kdebug_flags & ~KDBG_WRAPPED;
+ new_kdebug_flags |= KDBG_NOWRAP;
+ } while ( !OSCompareAndSwap((UInt32)old_kdebug_flags, (UInt32)new_kdebug_flags, (UInt32 *)&kdebug_flags));
+
+ last_wrap_time = 0;
+ last_wrap_cpu = -1;
+
+ for (cpu = 0; cpu < kd_cpus; cpu++) {
+ kd_buf *cur_bufptr;
+
+ if ((cur_bufptr = kdbip[cpu].kd_bufptr) >= kdbip[cpu].kd_buflast)
+ cur_bufptr = kdbip[cpu].kd_buffer;
- my_kdebug_flags = kdebug_flags;
- my_kd_bufptr = kd_bufptr;
+ if (kdbip[cpu].kd_wrapped) {
+ kdbip[cpu].kd_wrapped = 0;
+ kdbip[cpu].kd_readlast = cur_bufptr;
+ kdbip[cpu].kd_stop = cur_bufptr;
- lck_spin_unlock(kd_trace_lock);
- ml_set_interrupts_enabled(s);
+ if (kd_cpus > 1 && ((cur_bufptr->timestamp & KDBG_TIMESTAMP_MASK) > last_wrap_time)) {
+ last_wrap_time = cur_bufptr->timestamp & KDBG_TIMESTAMP_MASK;
+ last_wrap_cpu = cpu;
+ }
+ } else {
+ if (kdbip[cpu].kd_readlast == cur_bufptr)
+ kdbip[cpu].kd_stop = 0;
+ else
+ kdbip[cpu].kd_stop = cur_bufptr;
+ }
+ }
+ if (count > nkdbufs)
+ count = nkdbufs;
- count = avail/sizeof(kd_buf);
+ if ((tempbuf_count = count) > KDCOPYBUF_COUNT)
+ tempbuf_count = KDCOPYBUF_COUNT;
- if (count) {
- if ((my_kdebug_flags & KDBG_BUFINIT) && kd_bufsize && kd_buffer) {
- if (count > nkdbufs)
- count = nkdbufs;
-
- if (!(my_kdebug_flags & KDBG_WRAPPED)) {
- if (my_kd_bufptr == kd_readlast) {
- *number = 0;
- return(0);
- }
- if (my_kd_bufptr > kd_readlast) {
- copycount = my_kd_bufptr - kd_readlast;
- if (copycount > count)
- copycount = count;
-
- if (copyout(kd_readlast, buffer, copycount * sizeof(kd_buf))) {
- *number = 0;
- return(EINVAL);
- }
- kd_readlast += copycount;
- *number = copycount;
- return(0);
+ if (last_wrap_cpu == -1)
+ first_event = FALSE;
+
+ while (count) {
+ tempbuf = kdcopybuf;
+ tempbuf_number = 0;
+
+ while (tempbuf_count) {
+ mintime = 0xffffffffffffffffULL; /* all actual timestamps are below */
+ mincpu = -1;
+
+ for (cpu = 0; cpu < kd_cpus; cpu++) {
+ if (kdbip[cpu].kd_stop == 0) /* empty buffer */
+ continue;
+ t = kdbip[cpu].kd_readlast[0].timestamp & KDBG_TIMESTAMP_MASK;
+
+ if (t < mintime) {
+ mintime = t;
+ mincpu = cpu;
}
}
- if ( (my_kdebug_flags & KDBG_WRAPPED) ) {
- /* Note that by setting kd_readlast equal to my_kd_bufptr,
- * we now treat the kd_buffer read the same as if we weren't
- * wrapped and my_kd_bufptr was less than kd_readlast.
+ if (mincpu < 0)
+ /*
+ * all buffers ran empty early
*/
- kd_readlast = my_kd_bufptr;
- kdebug_flags &= ~KDBG_WRAPPED;
- }
- /*
- * first copyout from readlast to end of kd_buffer
- */
- copycount = kd_buflast - kd_readlast;
- if (copycount > count)
- copycount = count;
- if (copyout(kd_readlast, buffer, copycount * sizeof(kd_buf))) {
- *number = 0;
- return(EINVAL);
+ break;
+
+ if (first_event == TRUE) {
+ /*
+ * make sure we leave room for the
+ * LAST_WRAPPER event we inject
+ * by throwing away the first event
+ * it's better to lose that one
+ * than the last one
+ */
+ first_event = FALSE;
+
+ kdbip[mincpu].kd_readlast++;
+
+ if (kdbip[mincpu].kd_readlast == kdbip[mincpu].kd_buflast)
+ kdbip[mincpu].kd_readlast = kdbip[mincpu].kd_buffer;
+ if (kdbip[mincpu].kd_readlast == kdbip[mincpu].kd_stop)
+ kdbip[mincpu].kd_stop = 0;
+
+ continue;
}
- buffer += (copycount * sizeof(kd_buf));
- count -= copycount;
- totalcount = copycount;
- kd_readlast += copycount;
-
- if (kd_readlast == kd_buflast)
- kd_readlast = kd_buffer;
- if (count == 0) {
- *number = totalcount;
- return(0);
+ if (last_wrap_cpu == mincpu) {
+ tempbuf->debugid = MISCDBG_CODE(DBG_BUFFER, 0) | DBG_FUNC_NONE;
+ tempbuf->arg1 = kd_bufsize / sizeof(kd_buf);
+ tempbuf->arg2 = kd_cpus;
+ tempbuf->arg3 = 0;
+ tempbuf->arg4 = 0;
+ tempbuf->arg5 = (int)current_thread();
+
+ tempbuf->timestamp = last_wrap_time | (((uint64_t)last_wrap_cpu) << KDBG_CPU_SHIFT);
+
+ tempbuf++;
+
+ last_wrap_cpu = -1;
+
+ } else {
+ *(tempbuf++) = kdbip[mincpu].kd_readlast[0];
+
+ kdbip[mincpu].kd_readlast++;
+
+ if (kdbip[mincpu].kd_readlast == kdbip[mincpu].kd_buflast)
+ kdbip[mincpu].kd_readlast = kdbip[mincpu].kd_buffer;
+ if (kdbip[mincpu].kd_readlast == kdbip[mincpu].kd_stop)
+ kdbip[mincpu].kd_stop = 0;
}
- /* second copyout from top of kd_buffer to bufptr */
- copycount = my_kd_bufptr - kd_readlast;
- if (copycount > count)
- copycount = count;
- if (copycount == 0) {
- *number = totalcount;
- return(0);
+ tempbuf_count--;
+ tempbuf_number++;
+ }
+ if (tempbuf_number) {
+ if ((error = copyout(kdcopybuf, buffer, tempbuf_number * sizeof(kd_buf)))) {
+ *number = 0;
+ error = EINVAL;
+ break;
}
- if (copyout(kd_readlast, buffer, copycount * sizeof(kd_buf)))
- return(EINVAL);
-
- kd_readlast += copycount;
- totalcount += copycount;
- *number = totalcount;
- return(0);
+ count -= tempbuf_number;
+ *number += tempbuf_number;
+ buffer += (tempbuf_number * sizeof(kd_buf));
+ }
+ if (tempbuf_count)
+ /*
+ * all trace buffers are empty
+ */
+ break;
- } /* end if KDBG_BUFINIT */
- } /* end if count */
- return (EINVAL);
+ if ((tempbuf_count = count) > KDCOPYBUF_COUNT)
+ tempbuf_count = KDCOPYBUF_COUNT;
+ }
+ if ( !(old_kdebug_flags & KDBG_NOWRAP)) {
+ do {
+ old_kdebug_flags = kdebug_flags;
+ new_kdebug_flags = old_kdebug_flags & ~KDBG_NOWRAP;
+ } while ( !OSCompareAndSwap((UInt32)old_kdebug_flags, (UInt32)new_kdebug_flags, (UInt32 *)&kdebug_flags));
+
+ if ( !(old_kdebug_slowcheck & SLOW_NOLOG)) {
+ do {
+ old_kdebug_slowcheck = kdebug_slowcheck;
+ new_kdebug_slowcheck = old_kdebug_slowcheck & ~SLOW_NOLOG;
+ } while ( !OSCompareAndSwap((UInt32)old_kdebug_slowcheck, (UInt32)new_kdebug_slowcheck, (UInt32 *)&kdebug_slowcheck));
+ }
+ }
+ return (error);
}
+
unsigned char *getProcName(struct proc *proc);
unsigned char *getProcName(struct proc *proc) {
return (unsigned char *) &proc->p_comm; /* Return pointer to the proc name */
}
+
+#define STACKSHOT_SUBSYS_LOCK() lck_mtx_lock(&stackshot_subsys_mutex)
+#define STACKSHOT_SUBSYS_UNLOCK() lck_mtx_unlock(&stackshot_subsys_mutex)
+#ifdef __i386__
+#define TRAP_DEBUGGER __asm__ volatile("int3");
+#endif
+#ifdef __ppc__
+#define TRAP_DEBUGGER __asm__ volatile("tw 4,r3,r3");
+#endif
+
+#define SANE_TRACEBUF_SIZE 2*1024*1024
+
+/* Initialize the mutex governing access to the stack snapshot subsystem */
+__private_extern__ void
+stackshot_lock_init( void )
+{
+ stackshot_subsys_lck_grp_attr = lck_grp_attr_alloc_init();
+
+ stackshot_subsys_lck_grp = lck_grp_alloc_init("stackshot_subsys_lock", stackshot_subsys_lck_grp_attr);
+
+ stackshot_subsys_lck_attr = lck_attr_alloc_init();
+
+ lck_mtx_init(&stackshot_subsys_mutex, stackshot_subsys_lck_grp, stackshot_subsys_lck_attr);
+}
+
+/*
+ * stack_snapshot: Obtains a coherent set of stack traces for all threads
+ * on the system, tracing both kernel and user stacks
+ * where available. Uses machine specific trace routines
+ * for ppc, ppc64 and x86.
+ * Inputs: uap->pid - process id of process to be traced, or -1
+ * for the entire system
+ * uap->tracebuf - address of the user space destination
+ * buffer
+ * uap->tracebuf_size - size of the user space trace buffer
+ * uap->options - various options, including the maximum
+ * number of frames to trace.
+ * Outputs: EPERM if the caller is not privileged
+ * EINVAL if the supplied trace buffer isn't sanely sized
+ * ENOMEM if we don't have enough memory to satisfy the
+ * request
+ * ENOENT if the target pid isn't found
+ * ENOSPC if the supplied buffer is insufficient
+ * *retval contains the number of bytes traced, if successful
+ * and -1 otherwise. If the request failed due to
+ * tracebuffer exhaustion, we copyout as much as possible.
+ */
+int
+stack_snapshot(struct proc *p, register struct stack_snapshot_args *uap, register_t *retval) {
+ int error = 0;
+
+ if ((error = suser(kauth_cred_get(), &p->p_acflag)))
+ return(error);
+
+ return stack_snapshot2(uap->pid, uap->tracebuf, uap->tracebuf_size,
+ uap->options, retval);
+}
+
+int
+stack_snapshot2(pid_t pid, user_addr_t tracebuf, uint32_t tracebuf_size, uint32_t options, register_t *retval)
+{
+ int error = 0;
+ unsigned bytesTraced = 0;
+
+ *retval = -1;
+/* Serialize tracing */
+ STACKSHOT_SUBSYS_LOCK();
+
+ if ((tracebuf_size <= 0) || (tracebuf_size > SANE_TRACEBUF_SIZE)) {
+ error = EINVAL;
+ goto error_exit;
+ }
+
+ MALLOC(stackshot_snapbuf, void *, tracebuf_size, M_TEMP, M_WAITOK);
+
+ if (stackshot_snapbuf == NULL) {
+ error = ENOMEM;
+ goto error_exit;
+ }
+/* Preload trace parameters*/
+ kdp_snapshot_preflight(pid, stackshot_snapbuf, tracebuf_size, options);
+
+/* Trap to the debugger to obtain a coherent stack snapshot; this populates
+ * the trace buffer
+ */
+ if (panic_active()) {
+ error = ENOMEM;
+ goto error_exit;
+ }
+
+ TRAP_DEBUGGER;
+
+ bytesTraced = kdp_stack_snapshot_bytes_traced();
+
+ if (bytesTraced > 0) {
+ if ((error = copyout(stackshot_snapbuf, tracebuf,
+ ((bytesTraced < tracebuf_size) ?
+ bytesTraced : tracebuf_size))))
+ goto error_exit;
+ *retval = bytesTraced;
+ }
+ else {
+ error = ENOENT;
+ goto error_exit;
+ }
+
+ error = kdp_stack_snapshot_geterror();
+ if (error == -1) {
+ error = ENOSPC;
+ *retval = -1;
+ goto error_exit;
+ }
+
+error_exit:
+ if (stackshot_snapbuf != NULL)
+ FREE(stackshot_snapbuf, M_TEMP);
+ stackshot_snapbuf = NULL;
+ STACKSHOT_SUBSYS_UNLOCK();
+ return error;
+}
+
+void
+start_kern_tracing(unsigned int new_nkdbufs) {
+ if (!new_nkdbufs)
+ return;
+ kdbg_set_nkdbufs(new_nkdbufs);
+ kdbg_lock_init();
+ kdbg_reinit();
+ kdebug_enable |= KDEBUG_ENABLE_TRACE;
+ kdebug_slowcheck &= ~SLOW_NOLOG;
+ kdbg_mapinit();
+ printf("kernel tracing started\n");
+}
projects / apple / xnu.git / blobdiff