#include <mach/mach_types.h>
#include <mach/vm_param.h>
#include <mach/mach_vm.h>
#include <mach/clock_types.h>
#include <sys/errno.h>
#include <sys/stackshot.h>
#ifdef IMPORTANCE_INHERITANCE
#include <ipc/ipc_importance.h>
#endif
#include <sys/appleapiopts.h>
#include <kern/debug.h>
#include <kern/block_hint.h>
#include <uuid/uuid.h>
#include <kdp/kdp_dyld.h>
#include <kdp/kdp_en_debugger.h>
#include <libsa/types.h>
#include <libkern/version.h>
#include <libkern/section_keywords.h>
#include <string.h>
#include <kern/coalition.h>
#include <kern/processor.h>
#include <kern/thread.h>
#include <kern/thread_group.h>
#include <kern/task.h>
#include <kern/telemetry.h>
#include <kern/clock.h>
#include <kern/policy_internal.h>
#include <vm/vm_map.h>
#include <vm/vm_kern.h>
#include <vm/vm_pageout.h>
#include <vm/vm_fault.h>
#include <vm/vm_shared_region.h>
#include <libkern/OSKextLibPrivate.h>
#if defined(__x86_64__)
#include <i386/mp.h>
#include <i386/cpu_threads.h>
#endif
#if CONFIG_EMBEDDED
#include <pexpert/pexpert.h>
#endif
#if MONOTONIC
#include <kern/monotonic.h>
#endif
#include <san/kasan.h>
extern unsigned int not_in_kdp;
typedef uint64_t unaligned_u64 __attribute__((aligned(1)));
extern addr64_t kdp_vtophys(pmap_t pmap, addr64_t va);
int kdp_snapshot = 0;
static kern_return_t stack_snapshot_ret = 0;
static uint32_t stack_snapshot_bytes_traced = 0;
static kcdata_descriptor_t stackshot_kcdata_p = NULL;
static void *stack_snapshot_buf;
static uint32_t stack_snapshot_bufsize;
int stack_snapshot_pid;
static uint32_t stack_snapshot_flags;
static uint64_t stack_snapshot_delta_since_timestamp;
static boolean_t panic_stackshot;
static boolean_t stack_enable_faulting = FALSE;
static struct stackshot_fault_stats fault_stats;
static unaligned_u64 * stackshot_duration_outer;
static uint64_t stackshot_microsecs;
void * kernel_stackshot_buf = NULL;
int kernel_stackshot_buf_size = 0;
void * stackshot_snapbuf = NULL;
__private_extern__ void stackshot_init( void );
static boolean_t memory_iszero(void *addr, size_t size);
#if CONFIG_TELEMETRY
kern_return_t stack_microstackshot(user_addr_t tracebuf, uint32_t tracebuf_size, uint32_t flags, int32_t *retval);
#endif
uint32_t get_stackshot_estsize(uint32_t prev_size_hint);
kern_return_t kern_stack_snapshot_internal(int stackshot_config_version, void *stackshot_config,
size_t stackshot_config_size, boolean_t stackshot_from_user);
kern_return_t do_stackshot(void *);
void kdp_snapshot_preflight(int pid, void * tracebuf, uint32_t tracebuf_size, uint32_t flags, kcdata_descriptor_t data_p, uint64_t since_timestamp);
boolean_t stackshot_thread_is_idle_worker_unsafe(thread_t thread);
static int kdp_stackshot_kcdata_format(int pid, uint32_t trace_flags, uint32_t *pBytesTraced);
uint32_t kdp_stack_snapshot_bytes_traced(void);
static void kdp_mem_and_io_snapshot(struct mem_and_io_snapshot *memio_snap);
static boolean_t kdp_copyin(vm_map_t map, uint64_t uaddr, void *dest, size_t size, boolean_t try_fault, uint32_t *kdp_fault_result);
static int kdp_copyin_string(task_t task, uint64_t addr, char *buf, int buf_sz, boolean_t try_fault, uint32_t *kdp_fault_results);
static boolean_t kdp_copyin_word(task_t task, uint64_t addr, uint64_t *result, boolean_t try_fault, uint32_t *kdp_fault_results);
static uint64_t proc_was_throttled_from_task(task_t task);
static void stackshot_thread_wait_owner_info(thread_t thread, thread_waitinfo_t * waitinfo);
static int stackshot_thread_has_valid_waitinfo(thread_t thread);
static void stackshot_thread_turnstileinfo(thread_t thread, thread_turnstileinfo_t *tsinfo);
static int stackshot_thread_has_valid_turnstileinfo(thread_t thread);
#if CONFIG_COALITIONS
static void stackshot_coalition_jetsam_count(void *arg, int i, coalition_t coal);
static void stackshot_coalition_jetsam_snapshot(void *arg, int i, coalition_t coal);
#endif
extern uint32_t workqueue_get_pwq_state_kdp(void *proc);
extern int proc_pid(void *p);
extern uint64_t proc_uniqueid(void *p);
extern uint64_t proc_was_throttled(void *p);
extern uint64_t proc_did_throttle(void *p);
extern int proc_exiting(void *p);
extern int proc_in_teardown(void *p);
static uint64_t proc_did_throttle_from_task(task_t task);
extern void proc_name_kdp(task_t task, char * buf, int size);
extern int proc_threadname_kdp(void * uth, char * buf, size_t size);
extern void proc_starttime_kdp(void * p, uint64_t * tv_sec, uint64_t * tv_usec, uint64_t * abstime);
extern boolean_t proc_binary_uuid_kdp(task_t task, uuid_t uuid);
extern int memorystatus_get_pressure_status_kdp(void);
extern void memorystatus_proc_flags_unsafe(void * v, boolean_t *is_dirty, boolean_t *is_dirty_tracked, boolean_t *allow_idle_exit);
extern int count_busy_buffers(void);
extern void bcopy_phys(addr64_t, addr64_t, vm_size_t);
#if CONFIG_TELEMETRY
extern kern_return_t stack_microstackshot(user_addr_t tracebuf, uint32_t tracebuf_size, uint32_t flags, int32_t *retval);
#endif
extern kern_return_t kern_stack_snapshot_with_reason(char* reason);
extern kern_return_t kern_stack_snapshot_internal(int stackshot_config_version, void *stackshot_config, size_t stackshot_config_size, boolean_t stackshot_from_user);
vm_offset_t machine_trace_thread_get_kva(vm_offset_t cur_target_addr, vm_map_t map, uint32_t *thread_trace_flags);
#define KDP_FAULT_RESULT_PAGED_OUT 0x1
#define KDP_FAULT_RESULT_TRIED_FAULT 0x2
#define KDP_FAULT_RESULT_FAULTED_IN 0x4
vm_offset_t kdp_find_phys(vm_map_t map, vm_offset_t target_addr, boolean_t try_fault, uint32_t *kdp_fault_results);
static size_t stackshot_strlcpy(char *dst, const char *src, size_t maxlen);
static void stackshot_memcpy(void *dst, const void *src, size_t len);
void machine_trace_thread_clear_validation_cache(void);
#define MAX_FRAMES 1000
#define MAX_LOADINFOS 500
#define TASK_IMP_WALK_LIMIT 20
typedef struct thread_snapshot *thread_snapshot_t;
typedef struct task_snapshot *task_snapshot_t;
#if CONFIG_KDP_INTERACTIVE_DEBUGGING
extern kdp_send_t kdp_en_send_pkt;
#endif
static vm_offset_t prev_target_page = 0;
static vm_offset_t prev_target_kva = 0;
static boolean_t validate_next_addr = TRUE;
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;
#define STACKSHOT_SUBSYS_LOCK() lck_mtx_lock(&stackshot_subsys_mutex)
#define STACKSHOT_SUBSYS_TRY_LOCK() lck_mtx_try_lock(&stackshot_subsys_mutex)
#define STACKSHOT_SUBSYS_UNLOCK() lck_mtx_unlock(&stackshot_subsys_mutex)
#define SANE_BOOTPROFILE_TRACEBUF_SIZE (64ULL * 1024ULL * 1024ULL)
#define SANE_TRACEBUF_SIZE (8ULL * 1024ULL * 1024ULL)
#define TRACEBUF_SIZE_PER_GB (1024ULL * 1024ULL)
SECURITY_READ_ONLY_LATE(static uint32_t) max_tracebuf_size = SANE_TRACEBUF_SIZE;
#define KDP_FAULT_PATH_MAX_TIME_PER_STACKSHOT_NSECS (3 * NSEC_PER_MSEC)
#define STACKSHOT_SUPP_SIZE (16 * 1024)
#define TASK_UUID_AVG_SIZE (16 * sizeof(uuid_t))
#ifndef ROUNDUP
#define ROUNDUP(x, y) ((((x)+(y)-1)/(y))*(y))
#endif
#define STACKSHOT_QUEUE_LABEL_MAXSIZE 64
__private_extern__ void
stackshot_init( void )
{
mach_timebase_info_data_t timebase;
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);
clock_timebase_info(&timebase);
fault_stats.sfs_system_max_fault_time = ((KDP_FAULT_PATH_MAX_TIME_PER_STACKSHOT_NSECS * timebase.denom) / timebase.numer);
max_tracebuf_size = MAX(max_tracebuf_size, (ROUNDUP(max_mem, (1024ULL * 1024ULL * 1024ULL)) / TRACEBUF_SIZE_PER_GB));
PE_parse_boot_argn("stackshot_maxsz", &max_tracebuf_size, sizeof(max_tracebuf_size));
}
static uint64_t
safe_grab_timer_value(struct timer *t)
{
#if defined(__LP64__)
return t->all_bits;
#else
uint64_t time = t->high_bits;
time = (time << 32) | t->low_bits;
return time;
#endif
}
static kern_return_t
stackshot_trap()
{
kern_return_t rv;
#if defined(__x86_64__)
if (current_cpu_datap()->cpu_rendezvous_in_progress == TRUE) {
panic("Calling stackshot from a rendezvous is not allowed!");
}
mp_rendezvous_lock();
#endif
rv = DebuggerTrapWithState(DBOP_STACKSHOT, NULL, NULL, NULL, 0, NULL, FALSE, 0);
#if defined(__x86_64__)
mp_rendezvous_unlock();
#endif
return rv;
}
kern_return_t
stack_snapshot_from_kernel(int pid, void *buf, uint32_t size, uint32_t flags, uint64_t delta_since_timestamp, unsigned *bytes_traced)
{
kern_return_t error = KERN_SUCCESS;
boolean_t istate;
#if DEVELOPMENT || DEBUG
if (kern_feature_override(KF_STACKSHOT_OVRD) == TRUE) {
error = KERN_NOT_SUPPORTED;
goto out;
}
#endif
if ((buf == NULL) || (size <= 0) || (bytes_traced == NULL)) {
return KERN_INVALID_ARGUMENT;
}
if (size > max_tracebuf_size) {
size = max_tracebuf_size;
}
if (flags & STACKSHOT_TRYLOCK) {
if (!STACKSHOT_SUBSYS_TRY_LOCK()) {
return KERN_LOCK_OWNED;
}
} else {
STACKSHOT_SUBSYS_LOCK();
}
struct kcdata_descriptor kcdata;
uint32_t hdr_tag = (flags & STACKSHOT_COLLECT_DELTA_SNAPSHOT) ?
KCDATA_BUFFER_BEGIN_DELTA_STACKSHOT : KCDATA_BUFFER_BEGIN_STACKSHOT;
error = kcdata_memory_static_init(&kcdata, (mach_vm_address_t)buf, hdr_tag, size,
KCFLAG_USE_MEMCOPY | KCFLAG_NO_AUTO_ENDBUFFER);
if (error) {
goto out;
}
istate = ml_set_interrupts_enabled(FALSE);
kdp_snapshot_preflight(pid, buf, size, flags, &kcdata, delta_since_timestamp);
error = stackshot_trap();
ml_set_interrupts_enabled(istate);
*bytes_traced = kdp_stack_snapshot_bytes_traced();
out:
stackshot_kcdata_p = NULL;
STACKSHOT_SUBSYS_UNLOCK();
return error;
}
#if CONFIG_TELEMETRY
kern_return_t
stack_microstackshot(user_addr_t tracebuf, uint32_t tracebuf_size, uint32_t flags, int32_t *retval)
{
int error = KERN_SUCCESS;
uint32_t bytes_traced = 0;
*retval = -1;
if (flags & STACKSHOT_GLOBAL_MICROSTACKSHOT_ENABLE) {
telemetry_global_ctl(1);
*retval = 0;
goto exit;
} else if (flags & STACKSHOT_GLOBAL_MICROSTACKSHOT_DISABLE) {
telemetry_global_ctl(0);
*retval = 0;
goto exit;
}
*retval = -1;
if ((((void*)tracebuf) == NULL) || (tracebuf_size == 0)) {
error = KERN_INVALID_ARGUMENT;
goto exit;
}
STACKSHOT_SUBSYS_LOCK();
if (flags & STACKSHOT_GET_MICROSTACKSHOT) {
if (tracebuf_size > max_tracebuf_size) {
error = KERN_INVALID_ARGUMENT;
goto unlock_exit;
}
bytes_traced = tracebuf_size;
error = telemetry_gather(tracebuf, &bytes_traced,
(flags & STACKSHOT_SET_MICROSTACKSHOT_MARK) ? TRUE : FALSE);
*retval = (int)bytes_traced;
goto unlock_exit;
}
if (flags & STACKSHOT_GET_BOOT_PROFILE) {
if (tracebuf_size > SANE_BOOTPROFILE_TRACEBUF_SIZE) {
error = KERN_INVALID_ARGUMENT;
goto unlock_exit;
}
bytes_traced = tracebuf_size;
error = bootprofile_gather(tracebuf, &bytes_traced);
*retval = (int)bytes_traced;
}
unlock_exit:
STACKSHOT_SUBSYS_UNLOCK();
exit:
return error;
}
#endif
uint32_t
get_stackshot_estsize(uint32_t prev_size_hint)
{
vm_size_t thread_total;
vm_size_t task_total;
uint32_t estimated_size;
thread_total = (threads_count * sizeof(struct thread_snapshot));
task_total = (tasks_count * (sizeof(struct task_snapshot) + TASK_UUID_AVG_SIZE));
estimated_size = (uint32_t) VM_MAP_ROUND_PAGE((thread_total + task_total + STACKSHOT_SUPP_SIZE), PAGE_MASK);
if (estimated_size < prev_size_hint) {
estimated_size = (uint32_t) VM_MAP_ROUND_PAGE(prev_size_hint, PAGE_MASK);
}
return estimated_size;
}
static kern_return_t
stackshot_remap_buffer(void *stackshotbuf, uint32_t bytes_traced, uint64_t out_buffer_addr, uint64_t out_size_addr)
{
int error = 0;
mach_vm_offset_t stackshotbuf_user_addr = (mach_vm_offset_t)NULL;
vm_prot_t cur_prot, max_prot;
error = mach_vm_remap_kernel(get_task_map(current_task()), &stackshotbuf_user_addr, bytes_traced, 0,
VM_FLAGS_ANYWHERE, VM_KERN_MEMORY_NONE, kernel_map, (mach_vm_offset_t)stackshotbuf, FALSE, &cur_prot, &max_prot, VM_INHERIT_DEFAULT);
if (error == KERN_SUCCESS) {
error = copyout(CAST_DOWN(void *, &stackshotbuf_user_addr), (user_addr_t)out_buffer_addr, sizeof(stackshotbuf_user_addr));
if (error != KERN_SUCCESS) {
mach_vm_deallocate(get_task_map(current_task()), stackshotbuf_user_addr, (mach_vm_size_t)bytes_traced);
return error;
}
error = copyout(&bytes_traced, (user_addr_t)out_size_addr, sizeof(bytes_traced));
if (error != KERN_SUCCESS) {
mach_vm_deallocate(get_task_map(current_task()), stackshotbuf_user_addr, (mach_vm_size_t)bytes_traced);
return error;
}
}
return error;
}
kern_return_t
kern_stack_snapshot_internal(int stackshot_config_version, void *stackshot_config, size_t stackshot_config_size, boolean_t stackshot_from_user)
{
int error = 0;
boolean_t prev_interrupt_state;
uint32_t bytes_traced = 0;
uint32_t stackshotbuf_size = 0;
void * stackshotbuf = NULL;
kcdata_descriptor_t kcdata_p = NULL;
void * buf_to_free = NULL;
int size_to_free = 0;
uint64_t out_buffer_addr;
uint64_t out_size_addr;
int pid = -1;
uint32_t flags;
uint64_t since_timestamp;
uint32_t size_hint = 0;
if (stackshot_config == NULL) {
return KERN_INVALID_ARGUMENT;
}
#if DEVELOPMENT || DEBUG
if (kern_feature_override(KF_STACKSHOT_OVRD) == TRUE) {
return KERN_NOT_SUPPORTED;
}
#endif
switch (stackshot_config_version) {
case STACKSHOT_CONFIG_TYPE:
if (stackshot_config_size != sizeof(stackshot_config_t)) {
return KERN_INVALID_ARGUMENT;
}
stackshot_config_t *config = (stackshot_config_t *) stackshot_config;
out_buffer_addr = config->sc_out_buffer_addr;
out_size_addr = config->sc_out_size_addr;
pid = config->sc_pid;
flags = config->sc_flags;
since_timestamp = config->sc_delta_timestamp;
if (config->sc_size <= max_tracebuf_size) {
size_hint = config->sc_size;
}
break;
default:
return KERN_NOT_SUPPORTED;
}
if (stackshot_from_user) {
if (flags & (STACKSHOT_TRYLOCK | STACKSHOT_SAVE_IN_KERNEL_BUFFER | STACKSHOT_FROM_PANIC)) {
return KERN_NO_ACCESS;
}
} else {
if (!(flags & STACKSHOT_SAVE_IN_KERNEL_BUFFER)) {
return KERN_NOT_SUPPORTED;
}
}
if (!((flags & STACKSHOT_KCDATA_FORMAT) || (flags & STACKSHOT_RETRIEVE_EXISTING_BUFFER))) {
return KERN_NOT_SUPPORTED;
}
if ((!out_buffer_addr || !out_size_addr) && !(flags & STACKSHOT_SAVE_IN_KERNEL_BUFFER)) {
return KERN_INVALID_ARGUMENT;
}
if (since_timestamp != 0 && ((flags & STACKSHOT_COLLECT_DELTA_SNAPSHOT) == 0)) {
return KERN_INVALID_ARGUMENT;
}
#if MONOTONIC
if (!mt_core_supported) {
flags &= ~STACKSHOT_INSTRS_CYCLES;
}
#else
flags &= ~STACKSHOT_INSTRS_CYCLES;
#endif
STACKSHOT_SUBSYS_LOCK();
if (flags & STACKSHOT_SAVE_IN_KERNEL_BUFFER) {
if (kernel_stackshot_buf != NULL) {
error = KERN_MEMORY_PRESENT;
goto error_exit;
}
} else if (flags & STACKSHOT_RETRIEVE_EXISTING_BUFFER) {
if ((kernel_stackshot_buf == NULL) || (kernel_stackshot_buf_size <= 0)) {
error = KERN_NOT_IN_SET;
goto error_exit;
}
error = stackshot_remap_buffer(kernel_stackshot_buf, kernel_stackshot_buf_size,
out_buffer_addr, out_size_addr);
if (error == KERN_SUCCESS) {
buf_to_free = kernel_stackshot_buf;
size_to_free = (int) VM_MAP_ROUND_PAGE(kernel_stackshot_buf_size, PAGE_MASK);
kernel_stackshot_buf = NULL;
kernel_stackshot_buf_size = 0;
}
goto error_exit;
}
if (flags & STACKSHOT_GET_BOOT_PROFILE) {
void *bootprofile = NULL;
uint32_t len = 0;
#if CONFIG_TELEMETRY
bootprofile_get(&bootprofile, &len);
#endif
if (!bootprofile || !len) {
error = KERN_NOT_IN_SET;
goto error_exit;
}
error = stackshot_remap_buffer(bootprofile, len, out_buffer_addr, out_size_addr);
goto error_exit;
}
stackshotbuf_size = get_stackshot_estsize(size_hint);
for (; stackshotbuf_size <= max_tracebuf_size; stackshotbuf_size <<= 1) {
if (kmem_alloc(kernel_map, (vm_offset_t *)&stackshotbuf, stackshotbuf_size, VM_KERN_MEMORY_DIAG) != KERN_SUCCESS) {
error = KERN_RESOURCE_SHORTAGE;
goto error_exit;
}
uint32_t hdr_tag = (flags & STACKSHOT_COLLECT_DELTA_SNAPSHOT) ? KCDATA_BUFFER_BEGIN_DELTA_STACKSHOT : KCDATA_BUFFER_BEGIN_STACKSHOT;
kcdata_p = kcdata_memory_alloc_init((mach_vm_address_t)stackshotbuf, hdr_tag, stackshotbuf_size,
KCFLAG_USE_MEMCOPY | KCFLAG_NO_AUTO_ENDBUFFER);
stackshot_duration_outer = NULL;
uint64_t time_start = mach_absolute_time();
prev_interrupt_state = ml_set_interrupts_enabled(FALSE);
kdp_snapshot_preflight(pid, stackshotbuf, stackshotbuf_size, flags, kcdata_p, since_timestamp);
error = stackshot_trap();
ml_set_interrupts_enabled(prev_interrupt_state);
uint64_t time_end = mach_absolute_time();
if (stackshot_duration_outer) {
*stackshot_duration_outer = time_end - time_start;
}
if (error != KERN_SUCCESS) {
if (kcdata_p != NULL) {
kcdata_memory_destroy(kcdata_p);
kcdata_p = NULL;
stackshot_kcdata_p = NULL;
}
kmem_free(kernel_map, (vm_offset_t)stackshotbuf, stackshotbuf_size);
stackshotbuf = NULL;
if (error == KERN_INSUFFICIENT_BUFFER_SIZE) {
continue;
} else {
goto error_exit;
}
}
bytes_traced = kdp_stack_snapshot_bytes_traced();
if (bytes_traced <= 0) {
error = KERN_ABORTED;
goto error_exit;
}
assert(bytes_traced <= stackshotbuf_size);
if (!(flags & STACKSHOT_SAVE_IN_KERNEL_BUFFER)) {
error = stackshot_remap_buffer(stackshotbuf, bytes_traced, out_buffer_addr, out_size_addr);
goto error_exit;
}
kernel_stackshot_buf = stackshotbuf;
kernel_stackshot_buf_size = bytes_traced;
size_to_free = stackshotbuf_size - (int) VM_MAP_ROUND_PAGE(bytes_traced, PAGE_MASK);
assert(size_to_free >= 0);
if (size_to_free != 0) {
buf_to_free = (void *)((uint64_t)stackshotbuf + stackshotbuf_size - size_to_free);
}
stackshotbuf = NULL;
stackshotbuf_size = 0;
goto error_exit;
}
if (stackshotbuf_size > max_tracebuf_size) {
error = KERN_RESOURCE_SHORTAGE;
}
error_exit:
if (kcdata_p != NULL) {
kcdata_memory_destroy(kcdata_p);
kcdata_p = NULL;
stackshot_kcdata_p = NULL;
}
if (stackshotbuf != NULL) {
kmem_free(kernel_map, (vm_offset_t)stackshotbuf, stackshotbuf_size);
}
if (buf_to_free != NULL) {
kmem_free(kernel_map, (vm_offset_t)buf_to_free, size_to_free);
}
STACKSHOT_SUBSYS_UNLOCK();
return error;
}
void
kdp_snapshot_preflight(int pid, void * tracebuf, uint32_t tracebuf_size, uint32_t flags,
kcdata_descriptor_t data_p, uint64_t since_timestamp)
{
uint64_t microsecs = 0, secs = 0;
clock_get_calendar_microtime((clock_sec_t *)&secs, (clock_usec_t *)µsecs);
stackshot_microsecs = microsecs + (secs * USEC_PER_SEC);
stack_snapshot_pid = pid;
stack_snapshot_buf = tracebuf;
stack_snapshot_bufsize = tracebuf_size;
stack_snapshot_flags = flags;
stack_snapshot_delta_since_timestamp = since_timestamp;
panic_stackshot = ((flags & STACKSHOT_FROM_PANIC) != 0);
assert(data_p != NULL);
assert(stackshot_kcdata_p == NULL);
stackshot_kcdata_p = data_p;
stack_snapshot_bytes_traced = 0;
}
void
panic_stackshot_reset_state()
{
stackshot_kcdata_p = NULL;
}
boolean_t
stackshot_active()
{
return stackshot_kcdata_p != NULL;
}
uint32_t
kdp_stack_snapshot_bytes_traced(void)
{
return stack_snapshot_bytes_traced;
}
static boolean_t
memory_iszero(void *addr, size_t size)
{
char *data = (char *)addr;
for (size_t i = 0; i < size; i++) {
if (data[i] != 0) {
return FALSE;
}
}
return TRUE;
}
#define kcd_end_address(kcd) ((void *)((uint64_t)((kcd)->kcd_addr_begin) + kcdata_memory_get_used_bytes((kcd))))
#define kcd_max_address(kcd) ((void *)((kcd)->kcd_addr_begin + (kcd)->kcd_length))
#define kcd_exit_on_error(action) \
do { \
if (KERN_SUCCESS != (error = (action))) { \
if (error == KERN_RESOURCE_SHORTAGE) { \
error = KERN_INSUFFICIENT_BUFFER_SIZE; \
} \
goto error_exit; \
} \
} while (0);
static uint64_t
kcdata_get_task_ss_flags(task_t task)
{
uint64_t ss_flags = 0;
boolean_t task_64bit_addr = task_has_64Bit_addr(task);
if (task_64bit_addr) {
ss_flags |= kUser64_p;
}
if (!task->active || task_is_a_corpse(task) || proc_exiting(task->bsd_info)) {
ss_flags |= kTerminatedSnapshot;
}
if (task->pidsuspended) {
ss_flags |= kPidSuspended;
}
if (task->frozen) {
ss_flags |= kFrozen;
}
if (task->effective_policy.tep_darwinbg == 1) {
ss_flags |= kTaskDarwinBG;
}
if (task->requested_policy.trp_role == TASK_FOREGROUND_APPLICATION) {
ss_flags |= kTaskIsForeground;
}
if (task->requested_policy.trp_boosted == 1) {
ss_flags |= kTaskIsBoosted;
}
if (task->effective_policy.tep_sup_active == 1) {
ss_flags |= kTaskIsSuppressed;
}
#if CONFIG_MEMORYSTATUS
boolean_t dirty = FALSE, dirty_tracked = FALSE, allow_idle_exit = FALSE;
memorystatus_proc_flags_unsafe(task->bsd_info, &dirty, &dirty_tracked, &allow_idle_exit);
if (dirty) {
ss_flags |= kTaskIsDirty;
}
if (dirty_tracked) {
ss_flags |= kTaskIsDirtyTracked;
}
if (allow_idle_exit) {
ss_flags |= kTaskAllowIdleExit;
}
#endif
if (task->effective_policy.tep_tal_engaged) {
ss_flags |= kTaskTALEngaged;
}
ss_flags |= (0x7 & workqueue_get_pwq_state_kdp(task->bsd_info)) << 17;
#if IMPORTANCE_INHERITANCE
if (task->task_imp_base) {
if (task->task_imp_base->iit_donor) {
ss_flags |= kTaskIsImpDonor;
}
if (task->task_imp_base->iit_live_donor) {
ss_flags |= kTaskIsLiveImpDonor;
}
}
#endif
return ss_flags;
}
static kern_return_t
kcdata_record_shared_cache_info(kcdata_descriptor_t kcd, task_t task, unaligned_u64 *task_snap_ss_flags)
{
kern_return_t error = KERN_SUCCESS;
mach_vm_address_t out_addr = 0;
uint64_t shared_cache_slide = 0;
uint64_t shared_cache_base_address = 0;
uint32_t kdp_fault_results = 0;
assert(task_snap_ss_flags != NULL);
if (task->shared_region && ml_validate_nofault((vm_offset_t)task->shared_region, sizeof(struct vm_shared_region))) {
struct vm_shared_region *sr = task->shared_region;
shared_cache_base_address = sr->sr_base_address + sr->sr_first_mapping;
} else {
*task_snap_ss_flags |= kTaskSharedRegionInfoUnavailable;
goto error_exit;
}
if (!shared_cache_base_address || !task->shared_region->sr_uuid_copied) {
goto error_exit;
}
shared_cache_slide = task->shared_region->sr_slide_info.slide;
if (task->shared_region == init_task_shared_region) {
goto error_exit;
}
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_SHAREDCACHE_LOADINFO, sizeof(struct dyld_uuid_info_64_v2), &out_addr));
struct dyld_uuid_info_64_v2 *shared_cache_data = (struct dyld_uuid_info_64_v2 *)out_addr;
shared_cache_data->imageLoadAddress = shared_cache_slide;
stackshot_memcpy(shared_cache_data->imageUUID, task->shared_region->sr_uuid, sizeof(task->shared_region->sr_uuid));
shared_cache_data->imageSlidBaseAddress = shared_cache_base_address;
error_exit:
if (kdp_fault_results & KDP_FAULT_RESULT_PAGED_OUT) {
*task_snap_ss_flags |= kTaskUUIDInfoMissing;
}
if (kdp_fault_results & KDP_FAULT_RESULT_TRIED_FAULT) {
*task_snap_ss_flags |= kTaskUUIDInfoTriedFault;
}
if (kdp_fault_results & KDP_FAULT_RESULT_FAULTED_IN) {
*task_snap_ss_flags |= kTaskUUIDInfoFaultedIn;
}
return error;
}
static kern_return_t
kcdata_record_uuid_info(kcdata_descriptor_t kcd, task_t task, uint32_t trace_flags, boolean_t have_pmap, unaligned_u64 *task_snap_ss_flags)
{
boolean_t save_loadinfo_p = ((trace_flags & STACKSHOT_SAVE_LOADINFO) != 0);
boolean_t save_kextloadinfo_p = ((trace_flags & STACKSHOT_SAVE_KEXT_LOADINFO) != 0);
boolean_t should_fault = (trace_flags & STACKSHOT_ENABLE_UUID_FAULTING);
kern_return_t error = KERN_SUCCESS;
mach_vm_address_t out_addr = 0;
uint32_t uuid_info_count = 0;
mach_vm_address_t uuid_info_addr = 0;
uint64_t uuid_info_timestamp = 0;
uint32_t kdp_fault_results = 0;
assert(task_snap_ss_flags != NULL);
int task_pid = pid_from_task(task);
boolean_t task_64bit_addr = task_has_64Bit_addr(task);
if (save_loadinfo_p && have_pmap && task->active && task_pid > 0) {
if (task_64bit_addr) {
struct user64_dyld_all_image_infos task_image_infos;
if (kdp_copyin(task->map, task->all_image_info_addr, &task_image_infos,
sizeof(struct user64_dyld_all_image_infos), should_fault, &kdp_fault_results)) {
uuid_info_count = (uint32_t)task_image_infos.uuidArrayCount;
uuid_info_addr = task_image_infos.uuidArray;
if (task_image_infos.version >= DYLD_ALL_IMAGE_INFOS_TIMESTAMP_MINIMUM_VERSION) {
uuid_info_timestamp = task_image_infos.timestamp;
}
}
} else {
struct user32_dyld_all_image_infos task_image_infos;
if (kdp_copyin(task->map, task->all_image_info_addr, &task_image_infos,
sizeof(struct user32_dyld_all_image_infos), should_fault, &kdp_fault_results)) {
uuid_info_count = task_image_infos.uuidArrayCount;
uuid_info_addr = task_image_infos.uuidArray;
if (task_image_infos.version >= DYLD_ALL_IMAGE_INFOS_TIMESTAMP_MINIMUM_VERSION) {
uuid_info_timestamp = task_image_infos.timestamp;
}
}
}
if (!uuid_info_addr) {
uuid_info_count = 0;
}
}
if (have_pmap && task_pid == 0) {
if (save_kextloadinfo_p && ml_validate_nofault((vm_offset_t)(gLoadedKextSummaries), sizeof(OSKextLoadedKextSummaryHeader))) {
uuid_info_count = gLoadedKextSummaries->numSummaries + 1;
} else {
uuid_info_count = 1;
}
}
if (save_loadinfo_p && task_pid > 0 && (uuid_info_count < MAX_LOADINFOS)) {
uint32_t copied_uuid_count = 0;
uint32_t uuid_info_size = (uint32_t)(task_64bit_addr ? sizeof(struct user64_dyld_uuid_info) : sizeof(struct user32_dyld_uuid_info));
uint32_t uuid_info_array_size = 0;
if (uuid_info_count > 0) {
uuid_info_array_size = uuid_info_count * uuid_info_size;
kcd_exit_on_error(kcdata_get_memory_addr_for_array(kcd, (task_64bit_addr ? KCDATA_TYPE_LIBRARY_LOADINFO64 : KCDATA_TYPE_LIBRARY_LOADINFO),
uuid_info_size, uuid_info_count, &out_addr));
if (!kdp_copyin(task->map, uuid_info_addr, (void *)out_addr, uuid_info_array_size, should_fault, &kdp_fault_results)) {
bzero((void *)out_addr, uuid_info_array_size);
} else {
copied_uuid_count = uuid_info_count;
}
}
uuid_t binary_uuid;
if (!copied_uuid_count && proc_binary_uuid_kdp(task, binary_uuid)) {
if (uuid_info_array_size == 0) {
uuid_info_array_size = uuid_info_size;
kcd_exit_on_error(kcdata_get_memory_addr_for_array(kcd, (task_64bit_addr ? KCDATA_TYPE_LIBRARY_LOADINFO64 : KCDATA_TYPE_LIBRARY_LOADINFO),
uuid_info_size, 1, &out_addr));
}
if (task_64bit_addr) {
struct user64_dyld_uuid_info *uuid_info = (struct user64_dyld_uuid_info *)out_addr;
uint64_t image_load_address = task->mach_header_vm_address;
stackshot_memcpy(&uuid_info->imageUUID, binary_uuid, sizeof(uuid_t));
stackshot_memcpy(&uuid_info->imageLoadAddress, &image_load_address, sizeof(image_load_address));
} else {
struct user32_dyld_uuid_info *uuid_info = (struct user32_dyld_uuid_info *)out_addr;
uint32_t image_load_address = (uint32_t) task->mach_header_vm_address;
stackshot_memcpy(&uuid_info->imageUUID, binary_uuid, sizeof(uuid_t));
stackshot_memcpy(&uuid_info->imageLoadAddress, &image_load_address, sizeof(image_load_address));
}
}
} else if (task_pid == 0 && uuid_info_count > 0 && uuid_info_count < MAX_LOADINFOS) {
uintptr_t image_load_address;
do {
#if CONFIG_EMBEDDED
if (kernelcache_uuid_valid && !save_kextloadinfo_p) {
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_KERNELCACHE_LOADINFO, sizeof(struct dyld_uuid_info_64), &out_addr));
struct dyld_uuid_info_64 *kc_uuid = (struct dyld_uuid_info_64 *)out_addr;
kc_uuid->imageLoadAddress = VM_MIN_KERNEL_AND_KEXT_ADDRESS;
stackshot_memcpy(&kc_uuid->imageUUID, &kernelcache_uuid, sizeof(uuid_t));
break;
}
#endif
if (!kernel_uuid || !ml_validate_nofault((vm_offset_t)kernel_uuid, sizeof(uuid_t))) {
break;
}
kcd_exit_on_error(kcdata_get_memory_addr_for_array(
kcd, (sizeof(kernel_uuid_info) == sizeof(struct user64_dyld_uuid_info)) ? KCDATA_TYPE_LIBRARY_LOADINFO64
: KCDATA_TYPE_LIBRARY_LOADINFO,
sizeof(kernel_uuid_info), uuid_info_count, &out_addr));
kernel_uuid_info *uuid_info_array = (kernel_uuid_info *)out_addr;
image_load_address = (uintptr_t)VM_KERNEL_UNSLIDE(vm_kernel_stext);
uuid_info_array[0].imageLoadAddress = image_load_address;
stackshot_memcpy(&uuid_info_array[0].imageUUID, kernel_uuid, sizeof(uuid_t));
if (save_kextloadinfo_p &&
ml_validate_nofault((vm_offset_t)(gLoadedKextSummaries), sizeof(OSKextLoadedKextSummaryHeader)) &&
ml_validate_nofault((vm_offset_t)(&gLoadedKextSummaries->summaries[0]),
gLoadedKextSummaries->entry_size * gLoadedKextSummaries->numSummaries)) {
uint32_t kexti;
for (kexti = 0; kexti < gLoadedKextSummaries->numSummaries; kexti++) {
image_load_address = (uintptr_t)VM_KERNEL_UNSLIDE(gLoadedKextSummaries->summaries[kexti].address);
uuid_info_array[kexti + 1].imageLoadAddress = image_load_address;
stackshot_memcpy(&uuid_info_array[kexti + 1].imageUUID, &gLoadedKextSummaries->summaries[kexti].uuid, sizeof(uuid_t));
}
}
} while (0);
}
error_exit:
if (kdp_fault_results & KDP_FAULT_RESULT_PAGED_OUT) {
*task_snap_ss_flags |= kTaskUUIDInfoMissing;
}
if (kdp_fault_results & KDP_FAULT_RESULT_TRIED_FAULT) {
*task_snap_ss_flags |= kTaskUUIDInfoTriedFault;
}
if (kdp_fault_results & KDP_FAULT_RESULT_FAULTED_IN) {
*task_snap_ss_flags |= kTaskUUIDInfoFaultedIn;
}
return error;
}
static kern_return_t
kcdata_record_task_iostats(kcdata_descriptor_t kcd, task_t task)
{
kern_return_t error = KERN_SUCCESS;
mach_vm_address_t out_addr = 0;
assert(IO_NUM_PRIORITIES == STACKSHOT_IO_NUM_PRIORITIES);
if (task->task_io_stats && !memory_iszero(task->task_io_stats, sizeof(struct io_stat_info))) {
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_IOSTATS, sizeof(struct io_stats_snapshot), &out_addr));
struct io_stats_snapshot *_iostat = (struct io_stats_snapshot *)out_addr;
_iostat->ss_disk_reads_count = task->task_io_stats->disk_reads.count;
_iostat->ss_disk_reads_size = task->task_io_stats->disk_reads.size;
_iostat->ss_disk_writes_count = (task->task_io_stats->total_io.count - task->task_io_stats->disk_reads.count);
_iostat->ss_disk_writes_size = (task->task_io_stats->total_io.size - task->task_io_stats->disk_reads.size);
_iostat->ss_paging_count = task->task_io_stats->paging.count;
_iostat->ss_paging_size = task->task_io_stats->paging.size;
_iostat->ss_non_paging_count = (task->task_io_stats->total_io.count - task->task_io_stats->paging.count);
_iostat->ss_non_paging_size = (task->task_io_stats->total_io.size - task->task_io_stats->paging.size);
_iostat->ss_metadata_count = task->task_io_stats->metadata.count;
_iostat->ss_metadata_size = task->task_io_stats->metadata.size;
_iostat->ss_data_count = (task->task_io_stats->total_io.count - task->task_io_stats->metadata.count);
_iostat->ss_data_size = (task->task_io_stats->total_io.size - task->task_io_stats->metadata.size);
for (int i = 0; i < IO_NUM_PRIORITIES; i++) {
_iostat->ss_io_priority_count[i] = task->task_io_stats->io_priority[i].count;
_iostat->ss_io_priority_size[i] = task->task_io_stats->io_priority[i].size;
}
}
error_exit:
return error;
}
#if MONOTONIC
static kern_return_t
kcdata_record_task_instrs_cycles(kcdata_descriptor_t kcd, task_t task)
{
uint64_t instrs = 0, cycles = 0;
mt_stackshot_task(task, &instrs, &cycles);
kern_return_t error = KERN_SUCCESS;
mach_vm_address_t out_addr = 0;
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_INSTRS_CYCLES, sizeof(struct instrs_cycles_snapshot), &out_addr));
struct instrs_cycles_snapshot *instrs_cycles = (struct instrs_cycles_snapshot *)out_addr;
instrs_cycles->ics_instructions = instrs;
instrs_cycles->ics_cycles = cycles;
error_exit:
return error;
}
#endif
static kern_return_t
kcdata_record_task_snapshot(kcdata_descriptor_t kcd, task_t task, uint32_t trace_flags, boolean_t have_pmap, unaligned_u64 **task_snap_ss_flags)
{
boolean_t collect_delta_stackshot = ((trace_flags & STACKSHOT_COLLECT_DELTA_SNAPSHOT) != 0);
boolean_t collect_iostats = !collect_delta_stackshot && !(trace_flags & STACKSHOT_NO_IO_STATS);
#if MONOTONIC
boolean_t collect_instrs_cycles = ((trace_flags & STACKSHOT_INSTRS_CYCLES) != 0);
#endif
#if __arm__ || __arm64__
boolean_t collect_asid = ((trace_flags & STACKSHOT_ASID) != 0);
#endif
boolean_t collect_pagetables = ((trace_flags & STACKSHOT_PAGE_TABLES) != 0);
kern_return_t error = KERN_SUCCESS;
mach_vm_address_t out_addr = 0;
struct task_snapshot_v2 * cur_tsnap = NULL;
assert(task_snap_ss_flags != NULL);
int task_pid = pid_from_task(task);
uint64_t task_uniqueid = get_task_uniqueid(task);
uint64_t proc_starttime_secs = 0;
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_TASK_SNAPSHOT, sizeof(struct task_snapshot_v2), &out_addr));
cur_tsnap = (struct task_snapshot_v2 *)out_addr;
bzero(cur_tsnap, sizeof(*cur_tsnap));
cur_tsnap->ts_unique_pid = task_uniqueid;
cur_tsnap->ts_ss_flags = kcdata_get_task_ss_flags(task);
*task_snap_ss_flags = (unaligned_u64 *)&cur_tsnap->ts_ss_flags;
cur_tsnap->ts_user_time_in_terminated_threads = task->total_user_time;
cur_tsnap->ts_system_time_in_terminated_threads = task->total_system_time;
proc_starttime_kdp(task->bsd_info, &proc_starttime_secs, NULL, NULL);
cur_tsnap->ts_p_start_sec = proc_starttime_secs;
cur_tsnap->ts_task_size = have_pmap ? get_task_phys_footprint(task) : 0;
cur_tsnap->ts_max_resident_size = get_task_resident_max(task);
cur_tsnap->ts_was_throttled = (uint32_t) proc_was_throttled_from_task(task);
cur_tsnap->ts_did_throttle = (uint32_t) proc_did_throttle_from_task(task);
cur_tsnap->ts_suspend_count = task->suspend_count;
cur_tsnap->ts_faults = task->faults;
cur_tsnap->ts_pageins = task->pageins;
cur_tsnap->ts_cow_faults = task->cow_faults;
cur_tsnap->ts_latency_qos = (task->effective_policy.tep_latency_qos == LATENCY_QOS_TIER_UNSPECIFIED) ?
LATENCY_QOS_TIER_UNSPECIFIED : ((0xFF << 16) | task->effective_policy.tep_latency_qos);
cur_tsnap->ts_pid = task_pid;
#if __arm__ || __arm64__
if (collect_asid && have_pmap) {
uint32_t asid = PMAP_VASID(task->map->pmap);
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_ASID, sizeof(uint32_t), &out_addr));
stackshot_memcpy((void*)out_addr, &asid, sizeof(asid));
}
#endif
if (collect_pagetables && have_pmap) {
#if INTERRUPT_MASKED_DEBUG
ml_spin_debug_clear_self();
#endif
size_t bytes_dumped = pmap_dump_page_tables(task->map->pmap, kcd_end_address(kcd), kcd_max_address(kcd));
if (bytes_dumped == 0) {
error = KERN_INSUFFICIENT_BUFFER_SIZE;
goto error_exit;
} else if (bytes_dumped == (size_t)-1) {
error = KERN_NOT_SUPPORTED;
goto error_exit;
} else {
kcd_exit_on_error(kcdata_get_memory_addr_for_array(kcd, STACKSHOT_KCTYPE_PAGE_TABLES,
sizeof(uint64_t), (uint32_t)(bytes_dumped / sizeof(uint64_t)), &out_addr));
}
}
if (task_pid != -1 && task->bsd_info != NULL) {
proc_name_kdp(task, cur_tsnap->ts_p_comm, sizeof(cur_tsnap->ts_p_comm));
#if CONFIG_COALITIONS
if ((trace_flags & STACKSHOT_SAVE_JETSAM_COALITIONS) && (task->coalition[COALITION_TYPE_JETSAM] != NULL)) {
uint64_t jetsam_coal_id = coalition_id(task->coalition[COALITION_TYPE_JETSAM]);
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_JETSAM_COALITION, sizeof(jetsam_coal_id), &out_addr));
stackshot_memcpy((void*)out_addr, &jetsam_coal_id, sizeof(jetsam_coal_id));
}
#endif
} else {
cur_tsnap->ts_p_comm[0] = '\0';
#if IMPORTANCE_INHERITANCE && (DEVELOPMENT || DEBUG)
if (task->task_imp_base != NULL) {
stackshot_strlcpy(cur_tsnap->ts_p_comm, &task->task_imp_base->iit_procname[0],
MIN((int)sizeof(task->task_imp_base->iit_procname), (int)sizeof(cur_tsnap->ts_p_comm)));
}
#endif
}
if (collect_iostats) {
kcd_exit_on_error(kcdata_record_task_iostats(kcd, task));
}
#if MONOTONIC
if (collect_instrs_cycles) {
kcd_exit_on_error(kcdata_record_task_instrs_cycles(kcd, task));
}
#endif
error_exit:
return error;
}
static kern_return_t
kcdata_record_task_delta_snapshot(kcdata_descriptor_t kcd, task_t task, uint32_t trace_flags, boolean_t have_pmap, unaligned_u64 **task_snap_ss_flags)
{
#if !MONOTONIC
#pragma unused(trace_flags)
#endif
kern_return_t error = KERN_SUCCESS;
struct task_delta_snapshot_v2 * cur_tsnap = NULL;
mach_vm_address_t out_addr = 0;
(void) trace_flags;
#if __arm__ || __arm64__
boolean_t collect_asid = ((trace_flags & STACKSHOT_ASID) != 0);
#endif
#if MONOTONIC
boolean_t collect_instrs_cycles = ((trace_flags & STACKSHOT_INSTRS_CYCLES) != 0);
#endif
uint64_t task_uniqueid = get_task_uniqueid(task);
assert(task_snap_ss_flags != NULL);
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_TASK_DELTA_SNAPSHOT, sizeof(struct task_delta_snapshot_v2), &out_addr));
cur_tsnap = (struct task_delta_snapshot_v2 *)out_addr;
cur_tsnap->tds_unique_pid = task_uniqueid;
cur_tsnap->tds_ss_flags = kcdata_get_task_ss_flags(task);
*task_snap_ss_flags = (unaligned_u64 *)&cur_tsnap->tds_ss_flags;
cur_tsnap->tds_user_time_in_terminated_threads = task->total_user_time;
cur_tsnap->tds_system_time_in_terminated_threads = task->total_system_time;
cur_tsnap->tds_task_size = have_pmap ? get_task_phys_footprint(task) : 0;
cur_tsnap->tds_max_resident_size = get_task_resident_max(task);
cur_tsnap->tds_suspend_count = task->suspend_count;
cur_tsnap->tds_faults = task->faults;
cur_tsnap->tds_pageins = task->pageins;
cur_tsnap->tds_cow_faults = task->cow_faults;
cur_tsnap->tds_was_throttled = (uint32_t)proc_was_throttled_from_task(task);
cur_tsnap->tds_did_throttle = (uint32_t)proc_did_throttle_from_task(task);
cur_tsnap->tds_latency_qos = (task->effective_policy.tep_latency_qos == LATENCY_QOS_TIER_UNSPECIFIED)
? LATENCY_QOS_TIER_UNSPECIFIED
: ((0xFF << 16) | task->effective_policy.tep_latency_qos);
#if __arm__ || __arm64__
if (collect_asid && have_pmap) {
uint32_t asid = PMAP_VASID(task->map->pmap);
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_ASID, sizeof(uint32_t), &out_addr));
stackshot_memcpy((void*)out_addr, &asid, sizeof(asid));
}
#endif
#if MONOTONIC
if (collect_instrs_cycles) {
kcd_exit_on_error(kcdata_record_task_instrs_cycles(kcd, task));
}
#endif
error_exit:
return error;
}
static kern_return_t
kcdata_record_thread_iostats(kcdata_descriptor_t kcd, thread_t thread)
{
kern_return_t error = KERN_SUCCESS;
mach_vm_address_t out_addr = 0;
assert(IO_NUM_PRIORITIES == STACKSHOT_IO_NUM_PRIORITIES);
if (thread->thread_io_stats && !memory_iszero(thread->thread_io_stats, sizeof(struct io_stat_info))) {
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_IOSTATS, sizeof(struct io_stats_snapshot), &out_addr));
struct io_stats_snapshot *_iostat = (struct io_stats_snapshot *)out_addr;
_iostat->ss_disk_reads_count = thread->thread_io_stats->disk_reads.count;
_iostat->ss_disk_reads_size = thread->thread_io_stats->disk_reads.size;
_iostat->ss_disk_writes_count = (thread->thread_io_stats->total_io.count - thread->thread_io_stats->disk_reads.count);
_iostat->ss_disk_writes_size = (thread->thread_io_stats->total_io.size - thread->thread_io_stats->disk_reads.size);
_iostat->ss_paging_count = thread->thread_io_stats->paging.count;
_iostat->ss_paging_size = thread->thread_io_stats->paging.size;
_iostat->ss_non_paging_count = (thread->thread_io_stats->total_io.count - thread->thread_io_stats->paging.count);
_iostat->ss_non_paging_size = (thread->thread_io_stats->total_io.size - thread->thread_io_stats->paging.size);
_iostat->ss_metadata_count = thread->thread_io_stats->metadata.count;
_iostat->ss_metadata_size = thread->thread_io_stats->metadata.size;
_iostat->ss_data_count = (thread->thread_io_stats->total_io.count - thread->thread_io_stats->metadata.count);
_iostat->ss_data_size = (thread->thread_io_stats->total_io.size - thread->thread_io_stats->metadata.size);
for (int i = 0; i < IO_NUM_PRIORITIES; i++) {
_iostat->ss_io_priority_count[i] = thread->thread_io_stats->io_priority[i].count;
_iostat->ss_io_priority_size[i] = thread->thread_io_stats->io_priority[i].size;
}
}
error_exit:
return error;
}
static kern_return_t
kcdata_record_thread_snapshot(
kcdata_descriptor_t kcd, thread_t thread, task_t task, uint32_t trace_flags, boolean_t have_pmap, boolean_t thread_on_core)
{
boolean_t dispatch_p = ((trace_flags & STACKSHOT_GET_DQ) != 0);
boolean_t active_kthreads_only_p = ((trace_flags & STACKSHOT_ACTIVE_KERNEL_THREADS_ONLY) != 0);
boolean_t trace_fp_p = false;
boolean_t collect_delta_stackshot = ((trace_flags & STACKSHOT_COLLECT_DELTA_SNAPSHOT) != 0);
boolean_t collect_iostats = !collect_delta_stackshot && !(trace_flags & STACKSHOT_NO_IO_STATS);
#if MONOTONIC
boolean_t collect_instrs_cycles = ((trace_flags & STACKSHOT_INSTRS_CYCLES) != 0);
#endif
kern_return_t error = KERN_SUCCESS;
mach_vm_address_t out_addr = 0;
int saved_count = 0;
struct thread_snapshot_v4 * cur_thread_snap = NULL;
char cur_thread_name[STACKSHOT_MAX_THREAD_NAME_SIZE];
uint64_t tval = 0;
const boolean_t is_64bit_data = task_has_64Bit_data(task);
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_THREAD_SNAPSHOT, sizeof(struct thread_snapshot_v4), &out_addr));
cur_thread_snap = (struct thread_snapshot_v4 *)out_addr;
cur_thread_snap->ths_ss_flags = 0;
cur_thread_snap->ths_thread_id = thread_tid(thread);
cur_thread_snap->ths_wait_event = VM_KERNEL_UNSLIDE_OR_PERM(thread->wait_event);
cur_thread_snap->ths_continuation = VM_KERNEL_UNSLIDE(thread->continuation);
cur_thread_snap->ths_total_syscalls = thread->syscalls_mach + thread->syscalls_unix;
if (IPC_VOUCHER_NULL != thread->ith_voucher) {
cur_thread_snap->ths_voucher_identifier = VM_KERNEL_ADDRPERM(thread->ith_voucher);
} else {
cur_thread_snap->ths_voucher_identifier = 0;
}
cur_thread_snap->ths_dqserialnum = 0;
if (dispatch_p && (task != kernel_task) && (task->active) && have_pmap) {
uint64_t dqkeyaddr = thread_dispatchqaddr(thread);
if (dqkeyaddr != 0) {
uint64_t dqaddr = 0;
boolean_t copyin_ok = kdp_copyin_word(task, dqkeyaddr, &dqaddr, FALSE, NULL);
if (copyin_ok && dqaddr != 0) {
uint64_t dqserialnumaddr = dqaddr + get_task_dispatchqueue_serialno_offset(task);
uint64_t dqserialnum = 0;
copyin_ok = kdp_copyin_word(task, dqserialnumaddr, &dqserialnum, FALSE, NULL);
if (copyin_ok) {
cur_thread_snap->ths_ss_flags |= kHasDispatchSerial;
cur_thread_snap->ths_dqserialnum = dqserialnum;
}
uint64_t label_offs = get_task_dispatchqueue_label_offset(task);
if (label_offs) {
uint64_t dqlabeladdr = dqaddr + label_offs;
uint64_t actual_dqlabeladdr = 0;
copyin_ok = kdp_copyin_word(task, dqlabeladdr, &actual_dqlabeladdr, FALSE, NULL);
if (copyin_ok && actual_dqlabeladdr != 0) {
char label_buf[STACKSHOT_QUEUE_LABEL_MAXSIZE];
int len;
bzero(label_buf, STACKSHOT_QUEUE_LABEL_MAXSIZE * sizeof(char));
len = kdp_copyin_string(task, actual_dqlabeladdr, label_buf, STACKSHOT_QUEUE_LABEL_MAXSIZE, FALSE, NULL);
if (len > 0) {
mach_vm_address_t label_addr = 0;
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_THREAD_DISPATCH_QUEUE_LABEL, len, &label_addr));
stackshot_strlcpy((char*)label_addr, &label_buf[0], len);
}
}
}
}
}
}
tval = safe_grab_timer_value(&thread->user_timer);
cur_thread_snap->ths_user_time = tval;
tval = safe_grab_timer_value(&thread->system_timer);
if (thread->precise_user_kernel_time) {
cur_thread_snap->ths_sys_time = tval;
} else {
cur_thread_snap->ths_user_time += tval;
cur_thread_snap->ths_sys_time = 0;
}
if (thread->thread_tag & THREAD_TAG_MAINTHREAD) {
cur_thread_snap->ths_ss_flags |= kThreadMain;
}
if (thread->effective_policy.thep_darwinbg) {
cur_thread_snap->ths_ss_flags |= kThreadDarwinBG;
}
if (proc_get_effective_thread_policy(thread, TASK_POLICY_PASSIVE_IO)) {
cur_thread_snap->ths_ss_flags |= kThreadIOPassive;
}
if (thread->suspend_count > 0) {
cur_thread_snap->ths_ss_flags |= kThreadSuspended;
}
if (thread->options & TH_OPT_GLOBAL_FORCED_IDLE) {
cur_thread_snap->ths_ss_flags |= kGlobalForcedIdle;
}
if (thread_on_core) {
cur_thread_snap->ths_ss_flags |= kThreadOnCore;
}
if (stackshot_thread_is_idle_worker_unsafe(thread)) {
cur_thread_snap->ths_ss_flags |= kThreadIdleWorker;
}
static_assert(SS_TH_WAIT == TH_WAIT);
static_assert(SS_TH_SUSP == TH_SUSP);
static_assert(SS_TH_RUN == TH_RUN);
static_assert(SS_TH_UNINT == TH_UNINT);
static_assert(SS_TH_TERMINATE == TH_TERMINATE);
static_assert(SS_TH_TERMINATE2 == TH_TERMINATE2);
static_assert(SS_TH_IDLE == TH_IDLE);
cur_thread_snap->ths_last_run_time = thread->last_run_time;
cur_thread_snap->ths_last_made_runnable_time = thread->last_made_runnable_time;
cur_thread_snap->ths_state = thread->state;
cur_thread_snap->ths_sched_flags = thread->sched_flags;
cur_thread_snap->ths_base_priority = thread->base_pri;
cur_thread_snap->ths_sched_priority = thread->sched_pri;
cur_thread_snap->ths_eqos = thread->effective_policy.thep_qos;
cur_thread_snap->ths_rqos = thread->requested_policy.thrp_qos;
cur_thread_snap->ths_rqos_override = MAX(thread->requested_policy.thrp_qos_override,
thread->requested_policy.thrp_qos_workq_override);
cur_thread_snap->ths_io_tier = proc_get_effective_thread_policy(thread, TASK_POLICY_IO);
cur_thread_snap->ths_thread_t = VM_KERNEL_UNSLIDE_OR_PERM(thread);
static_assert(sizeof(thread->effective_policy) == sizeof(uint64_t));
static_assert(sizeof(thread->requested_policy) == sizeof(uint64_t));
cur_thread_snap->ths_requested_policy = *(unaligned_u64 *) &thread->requested_policy;
cur_thread_snap->ths_effective_policy = *(unaligned_u64 *) &thread->effective_policy;
cur_thread_name[0] = '\0';
proc_threadname_kdp(thread->uthread, cur_thread_name, STACKSHOT_MAX_THREAD_NAME_SIZE);
if (strnlen(cur_thread_name, STACKSHOT_MAX_THREAD_NAME_SIZE) > 0) {
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_THREAD_NAME, sizeof(cur_thread_name), &out_addr));
stackshot_memcpy((void *)out_addr, (void *)cur_thread_name, sizeof(cur_thread_name));
}
time_value_t user_time, system_time, runnable_time;
thread_read_times(thread, &user_time, &system_time, &runnable_time);
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_CPU_TIMES, sizeof(struct stackshot_cpu_times_v2), &out_addr));
struct stackshot_cpu_times_v2 *stackshot_cpu_times = (struct stackshot_cpu_times_v2 *)out_addr;
*stackshot_cpu_times = (struct stackshot_cpu_times_v2){
.user_usec = (uint64_t)user_time.seconds * USEC_PER_SEC + user_time.microseconds,
.system_usec = (uint64_t)system_time.seconds * USEC_PER_SEC + system_time.microseconds,
.runnable_usec = (uint64_t)runnable_time.seconds * USEC_PER_SEC + runnable_time.microseconds,
};
if (!active_kthreads_only_p && task->active && thread->task->map != kernel_map) {
uint32_t thread_snapshot_flags = 0;
if (is_64bit_data) {
uint64_t sp = 0;
out_addr = (mach_vm_address_t)kcd_end_address(kcd);
saved_count = machine_trace_thread64(thread, (char *)out_addr, (char *)kcd_max_address(kcd), MAX_FRAMES, TRUE,
trace_fp_p, &thread_snapshot_flags, &sp);
if (saved_count > 0) {
int frame_size = trace_fp_p ? sizeof(struct stack_snapshot_frame64) : sizeof(uint64_t);
kcd_exit_on_error(kcdata_get_memory_addr_for_array(kcd, trace_fp_p ? STACKSHOT_KCTYPE_USER_STACKFRAME64
: STACKSHOT_KCTYPE_USER_STACKLR64,
frame_size, saved_count / frame_size, &out_addr));
cur_thread_snap->ths_ss_flags |= kUser64_p;
}
#if __x86_64__
if (sp) {
vm_offset_t kern_virt_addr = machine_trace_thread_get_kva(sp, thread->task->map, &thread_snapshot_flags);
if (kern_virt_addr && (kern_virt_addr % 8) == 0) {
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_USER_STACKTOP, sizeof(struct stack_snapshot_stacktop), &out_addr));
struct stack_snapshot_stacktop *stacktop = (struct stack_snapshot_stacktop *)out_addr;
stacktop->sp = sp;
memcpy(stacktop->stack_contents, (void*) kern_virt_addr, 8);
}
}
#endif
} else {
out_addr = (mach_vm_address_t)kcd_end_address(kcd);
saved_count = machine_trace_thread(thread, (char *)out_addr, (char *)kcd_max_address(kcd), MAX_FRAMES, TRUE, trace_fp_p,
&thread_snapshot_flags);
if (saved_count > 0) {
int frame_size = trace_fp_p ? sizeof(struct stack_snapshot_frame32) : sizeof(uint32_t);
kcd_exit_on_error(kcdata_get_memory_addr_for_array(kcd, trace_fp_p ? STACKSHOT_KCTYPE_USER_STACKFRAME
: STACKSHOT_KCTYPE_USER_STACKLR,
frame_size, saved_count / frame_size, &out_addr));
}
}
if (thread_snapshot_flags != 0) {
cur_thread_snap->ths_ss_flags |= thread_snapshot_flags;
}
}
if (thread->kernel_stack != 0) {
uint32_t thread_snapshot_flags = 0;
#if defined(__LP64__)
out_addr = (mach_vm_address_t)kcd_end_address(kcd);
saved_count = machine_trace_thread64(thread, (char *)out_addr, (char *)kcd_max_address(kcd), MAX_FRAMES, FALSE, trace_fp_p,
&thread_snapshot_flags, NULL);
if (saved_count > 0) {
int frame_size = trace_fp_p ? sizeof(struct stack_snapshot_frame64) : sizeof(uint64_t);
cur_thread_snap->ths_ss_flags |= kKernel64_p;
kcd_exit_on_error(kcdata_get_memory_addr_for_array(kcd, trace_fp_p ? STACKSHOT_KCTYPE_KERN_STACKFRAME64
: STACKSHOT_KCTYPE_KERN_STACKLR64,
frame_size, saved_count / frame_size, &out_addr));
}
#else
out_addr = (mach_vm_address_t)kcd_end_address(kcd);
saved_count = machine_trace_thread(thread, (char *)out_addr, (char *)kcd_max_address(kcd), MAX_FRAMES, FALSE, trace_fp_p,
&thread_snapshot_flags);
if (saved_count > 0) {
int frame_size = trace_fp_p ? sizeof(struct stack_snapshot_frame32) : sizeof(uint32_t);
kcd_exit_on_error(
kcdata_get_memory_addr_for_array(kcd, trace_fp_p ? STACKSHOT_KCTYPE_KERN_STACKFRAME : STACKSHOT_KCTYPE_KERN_STACKLR,
frame_size, saved_count / frame_size, &out_addr));
}
#endif
if (thread_snapshot_flags != 0) {
cur_thread_snap->ths_ss_flags |= thread_snapshot_flags;
}
}
if (collect_iostats) {
kcd_exit_on_error(kcdata_record_thread_iostats(kcd, thread));
}
#if MONOTONIC
if (collect_instrs_cycles) {
uint64_t instrs = 0, cycles = 0;
mt_stackshot_thread(thread, &instrs, &cycles);
kcd_exit_on_error(kcdata_get_memory_addr(kcd, STACKSHOT_KCTYPE_INSTRS_CYCLES, sizeof(struct instrs_cycles_snapshot), &out_addr));
struct instrs_cycles_snapshot *instrs_cycles = (struct instrs_cycles_snapshot *)out_addr;
instrs_cycles->ics_instructions = instrs;
instrs_cycles->ics_cycles = cycles;
}
#endif
error_exit:
return error;
}
static int
kcdata_record_thread_delta_snapshot(struct thread_delta_snapshot_v3 * cur_thread_snap, thread_t thread, boolean_t thread_on_core)
{
cur_thread_snap->tds_thread_id = thread_tid(thread);
if (IPC_VOUCHER_NULL != thread->ith_voucher) {
cur_thread_snap->tds_voucher_identifier = VM_KERNEL_ADDRPERM(thread->ith_voucher);
} else {
cur_thread_snap->tds_voucher_identifier = 0;
}
cur_thread_snap->tds_ss_flags = 0;
if (thread->effective_policy.thep_darwinbg) {
cur_thread_snap->tds_ss_flags |= kThreadDarwinBG;
}
if (proc_get_effective_thread_policy(thread, TASK_POLICY_PASSIVE_IO)) {
cur_thread_snap->tds_ss_flags |= kThreadIOPassive;
}
if (thread->suspend_count > 0) {
cur_thread_snap->tds_ss_flags |= kThreadSuspended;
}
if (thread->options & TH_OPT_GLOBAL_FORCED_IDLE) {
cur_thread_snap->tds_ss_flags |= kGlobalForcedIdle;
}
if (thread_on_core) {
cur_thread_snap->tds_ss_flags |= kThreadOnCore;
}
if (stackshot_thread_is_idle_worker_unsafe(thread)) {
cur_thread_snap->tds_ss_flags |= kThreadIdleWorker;
}
cur_thread_snap->tds_last_made_runnable_time = thread->last_made_runnable_time;
cur_thread_snap->tds_state = thread->state;
cur_thread_snap->tds_sched_flags = thread->sched_flags;
cur_thread_snap->tds_base_priority = thread->base_pri;
cur_thread_snap->tds_sched_priority = thread->sched_pri;
cur_thread_snap->tds_eqos = thread->effective_policy.thep_qos;
cur_thread_snap->tds_rqos = thread->requested_policy.thrp_qos;
cur_thread_snap->tds_rqos_override = MAX(thread->requested_policy.thrp_qos_override,
thread->requested_policy.thrp_qos_workq_override);
cur_thread_snap->tds_io_tier = proc_get_effective_thread_policy(thread, TASK_POLICY_IO);
static_assert(sizeof(thread->effective_policy) == sizeof(uint64_t));
static_assert(sizeof(thread->requested_policy) == sizeof(uint64_t));
cur_thread_snap->tds_requested_policy = *(unaligned_u64 *) &thread->requested_policy;
cur_thread_snap->tds_effective_policy = *(unaligned_u64 *) &thread->effective_policy;
return 0;
}
#define UNIQUEIDSPERFLUSH 12
struct saved_uniqueids {
uint64_t ids[UNIQUEIDSPERFLUSH];
unsigned count;
};
enum thread_classification {
tc_full_snapshot,
tc_delta_snapshot,
};
static enum thread_classification
classify_thread(thread_t thread, boolean_t * thread_on_core_p, uint32_t trace_flags)
{
boolean_t collect_delta_stackshot = ((trace_flags & STACKSHOT_COLLECT_DELTA_SNAPSHOT) != 0);
processor_t last_processor = thread->last_processor;
boolean_t thread_on_core =
(last_processor != PROCESSOR_NULL &&
(last_processor->state == PROCESSOR_SHUTDOWN || last_processor->state == PROCESSOR_RUNNING) &&
last_processor->active_thread == thread);
*thread_on_core_p = thread_on_core;
if (!collect_delta_stackshot || thread_on_core || (thread->last_run_time > stack_snapshot_delta_since_timestamp)) {
return tc_full_snapshot;
} else {
return tc_delta_snapshot;
}
}
struct stackshot_context {
int pid;
uint32_t trace_flags;
};
static kern_return_t
kdp_stackshot_record_task(struct stackshot_context *ctx, task_t task)
{
boolean_t active_kthreads_only_p = ((ctx->trace_flags & STACKSHOT_ACTIVE_KERNEL_THREADS_ONLY) != 0);
boolean_t save_donating_pids_p = ((ctx->trace_flags & STACKSHOT_SAVE_IMP_DONATION_PIDS) != 0);
boolean_t collect_delta_stackshot = ((ctx->trace_flags & STACKSHOT_COLLECT_DELTA_SNAPSHOT) != 0);
boolean_t save_owner_info = ((ctx->trace_flags & STACKSHOT_THREAD_WAITINFO) != 0);
kern_return_t error = KERN_SUCCESS;
mach_vm_address_t out_addr = 0;
int saved_count = 0;
int task_pid = 0;
uint64_t task_uniqueid = 0;
int num_delta_thread_snapshots = 0;
int num_nonrunnable_threads = 0;
int num_waitinfo_threads = 0;
int num_turnstileinfo_threads = 0;
uint64_t task_start_abstime = 0;
boolean_t task_delta_stackshot = FALSE;
boolean_t have_map = FALSE, have_pmap = FALSE;
boolean_t some_thread_ran = FALSE;
unaligned_u64 *task_snap_ss_flags = NULL;
#if INTERRUPT_MASKED_DEBUG && MONOTONIC
uint64_t task_begin_cpu_cycle_count = 0;
if (!panic_stackshot) {
task_begin_cpu_cycle_count = mt_cur_cpu_cycles();
}
#endif
if ((task == NULL) || !ml_validate_nofault((vm_offset_t)task, sizeof(struct task))) {
error = KERN_FAILURE;
goto error_exit;
}
have_map = (task->map != NULL) && (ml_validate_nofault((vm_offset_t)(task->map), sizeof(struct _vm_map)));
have_pmap = have_map && (task->map->pmap != NULL) && (ml_validate_nofault((vm_offset_t)(task->map->pmap), sizeof(struct pmap)));
task_pid = pid_from_task(task);
task_uniqueid = get_task_uniqueid(task);
if (!task->active || task_is_a_corpse(task)) {
if (queue_empty(&task->threads) || task_pid == -1) {
return KERN_SUCCESS;
}
}
if (collect_delta_stackshot) {
proc_starttime_kdp(task->bsd_info, NULL, NULL, &task_start_abstime);
}
if ((ctx->pid == -1) || (ctx->pid == task_pid)) {
kcd_exit_on_error(kcdata_add_container_marker(stackshot_kcdata_p, KCDATA_TYPE_CONTAINER_BEGIN,
STACKSHOT_KCCONTAINER_TASK, task_uniqueid));
if (!collect_delta_stackshot || (task_start_abstime == 0) ||
(task_start_abstime > stack_snapshot_delta_since_timestamp)) {
kcd_exit_on_error(kcdata_record_task_snapshot(stackshot_kcdata_p, task, ctx->trace_flags, have_pmap, &task_snap_ss_flags));
} else {
task_delta_stackshot = TRUE;
kcd_exit_on_error(kcdata_record_task_delta_snapshot(stackshot_kcdata_p, task, ctx->trace_flags, have_pmap, &task_snap_ss_flags));
}
thread_t thread = THREAD_NULL;
queue_iterate(&task->threads, thread, thread_t, task_threads)
{
uint64_t thread_uniqueid;
if ((thread == NULL) || !ml_validate_nofault((vm_offset_t)thread, sizeof(struct thread))) {
error = KERN_FAILURE;
goto error_exit;
}
if (active_kthreads_only_p && thread->kernel_stack == 0) {
continue;
}
thread_uniqueid = thread_tid(thread);
boolean_t thread_on_core;
enum thread_classification thread_classification = classify_thread(thread, &thread_on_core, ctx->trace_flags);
switch (thread_classification) {
case tc_full_snapshot:
kcd_exit_on_error(kcdata_add_container_marker(stackshot_kcdata_p, KCDATA_TYPE_CONTAINER_BEGIN,
STACKSHOT_KCCONTAINER_THREAD, thread_uniqueid));
kcd_exit_on_error(
kcdata_record_thread_snapshot(stackshot_kcdata_p, thread, task, ctx->trace_flags, have_pmap, thread_on_core));
kcd_exit_on_error(kcdata_add_container_marker(stackshot_kcdata_p, KCDATA_TYPE_CONTAINER_END,
STACKSHOT_KCCONTAINER_THREAD, thread_uniqueid));
some_thread_ran = TRUE;
break;
case tc_delta_snapshot:
num_delta_thread_snapshots++;
break;
}
if (save_owner_info) {
if (stackshot_thread_has_valid_waitinfo(thread)) {
num_waitinfo_threads++;
}
if (stackshot_thread_has_valid_turnstileinfo(thread)) {
num_turnstileinfo_threads++;
}
}
}
struct thread_delta_snapshot_v3 * delta_snapshots = NULL;
int current_delta_snapshot_index = 0;
if (num_delta_thread_snapshots > 0) {
kcd_exit_on_error(kcdata_get_memory_addr_for_array(stackshot_kcdata_p, STACKSHOT_KCTYPE_THREAD_DELTA_SNAPSHOT,
sizeof(struct thread_delta_snapshot_v3),
num_delta_thread_snapshots, &out_addr));
delta_snapshots = (struct thread_delta_snapshot_v3 *)out_addr;
}
uint64_t * nonrunnable_tids = NULL;
if (num_nonrunnable_threads > 0) {
kcd_exit_on_error(kcdata_get_memory_addr_for_array(stackshot_kcdata_p, STACKSHOT_KCTYPE_NONRUNNABLE_TIDS,
sizeof(uint64_t), num_nonrunnable_threads, &out_addr));
nonrunnable_tids = (uint64_t *)out_addr;
}
thread_waitinfo_t *thread_waitinfo = NULL;
thread_turnstileinfo_t *thread_turnstileinfo = NULL;
int current_waitinfo_index = 0;
int current_turnstileinfo_index = 0;
if (num_waitinfo_threads > 0) {
kcd_exit_on_error(kcdata_get_memory_addr_for_array(stackshot_kcdata_p, STACKSHOT_KCTYPE_THREAD_WAITINFO,
sizeof(thread_waitinfo_t), num_waitinfo_threads, &out_addr));
thread_waitinfo = (thread_waitinfo_t *)out_addr;
}
if (num_turnstileinfo_threads > 0) {
kcd_exit_on_error(kcdata_get_memory_addr_for_array(stackshot_kcdata_p, STACKSHOT_KCTYPE_THREAD_TURNSTILEINFO,
sizeof(thread_turnstileinfo_t), num_turnstileinfo_threads, &out_addr));
thread_turnstileinfo = (thread_turnstileinfo_t *)out_addr;
}
if (num_delta_thread_snapshots > 0 || num_nonrunnable_threads > 0 ||
num_waitinfo_threads > 0 || num_turnstileinfo_threads > 0) {
queue_iterate(&task->threads, thread, thread_t, task_threads)
{
if (active_kthreads_only_p && thread->kernel_stack == 0) {
continue;
}
if (save_owner_info) {
if (stackshot_thread_has_valid_waitinfo(thread)) {
stackshot_thread_wait_owner_info(
thread,
&thread_waitinfo[current_waitinfo_index++]);
}
if (stackshot_thread_has_valid_turnstileinfo(thread)) {
stackshot_thread_turnstileinfo(
thread,
&thread_turnstileinfo[current_turnstileinfo_index++]);
}
}
boolean_t thread_on_core;
enum thread_classification thread_classification = classify_thread(thread, &thread_on_core, ctx->trace_flags);
switch (thread_classification) {
case tc_full_snapshot:
continue;
case tc_delta_snapshot:
kcd_exit_on_error(kcdata_record_thread_delta_snapshot(&delta_snapshots[current_delta_snapshot_index++],
thread, thread_on_core));
break;
}
}
#if DEBUG || DEVELOPMENT
if (current_delta_snapshot_index != num_delta_thread_snapshots) {
panic("delta thread snapshot count mismatch while capturing snapshots for task %p. expected %d, found %d", task,
num_delta_thread_snapshots, current_delta_snapshot_index);
}
if (current_waitinfo_index != num_waitinfo_threads) {
panic("thread wait info count mismatch while capturing snapshots for task %p. expected %d, found %d", task,
num_waitinfo_threads, current_waitinfo_index);
}
#endif
}
#if IMPORTANCE_INHERITANCE
if (save_donating_pids_p) {
kcd_exit_on_error(
((((mach_vm_address_t)kcd_end_address(stackshot_kcdata_p) + (TASK_IMP_WALK_LIMIT * sizeof(int32_t))) <
(mach_vm_address_t)kcd_max_address(stackshot_kcdata_p))
? KERN_SUCCESS
: KERN_RESOURCE_SHORTAGE));
saved_count = task_importance_list_pids(task, TASK_IMP_LIST_DONATING_PIDS,
(void *)kcd_end_address(stackshot_kcdata_p), TASK_IMP_WALK_LIMIT);
if (saved_count > 0) {
kcd_exit_on_error(kcdata_get_memory_addr_for_array(stackshot_kcdata_p, STACKSHOT_KCTYPE_DONATING_PIDS,
sizeof(int32_t), saved_count, &out_addr));
}
}
#endif
if (!collect_delta_stackshot || (num_delta_thread_snapshots != task->thread_count) || !task_delta_stackshot) {
kcd_exit_on_error(kcdata_record_shared_cache_info(stackshot_kcdata_p, task, task_snap_ss_flags));
kcd_exit_on_error(kcdata_record_uuid_info(stackshot_kcdata_p, task, ctx->trace_flags, have_pmap, task_snap_ss_flags));
}
#if INTERRUPT_MASKED_DEBUG && MONOTONIC
if (!panic_stackshot) {
kcd_exit_on_error(kcdata_add_uint64_with_description(stackshot_kcdata_p, (mt_cur_cpu_cycles() - task_begin_cpu_cycle_count),
"task_cpu_cycle_count"));
}
#endif
kcd_exit_on_error(kcdata_add_container_marker(stackshot_kcdata_p, KCDATA_TYPE_CONTAINER_END, STACKSHOT_KCCONTAINER_TASK,
task_uniqueid));
}
error_exit:
return error;
}
static kern_return_t
kdp_stackshot_kcdata_format(int pid, uint32_t trace_flags, uint32_t * pBytesTraced)
{
kern_return_t error = KERN_SUCCESS;
mach_vm_address_t out_addr = 0;
uint64_t abs_time = 0, abs_time_end = 0;
uint64_t *abs_time_addr = NULL;
uint64_t system_state_flags = 0;
task_t task = TASK_NULL;
mach_timebase_info_data_t timebase = {0, 0};
uint32_t length_to_copy = 0, tmp32 = 0;
abs_time = mach_absolute_time();
#if INTERRUPT_MASKED_DEBUG && MONOTONIC
uint64_t stackshot_begin_cpu_cycle_count = 0;
if (!panic_stackshot) {
stackshot_begin_cpu_cycle_count = mt_cur_cpu_cycles();
}
#endif
boolean_t collect_delta_stackshot = ((trace_flags & STACKSHOT_COLLECT_DELTA_SNAPSHOT) != 0);
boolean_t use_fault_path = ((trace_flags & (STACKSHOT_ENABLE_UUID_FAULTING | STACKSHOT_ENABLE_BT_FAULTING)) != 0);
stack_enable_faulting = (trace_flags & (STACKSHOT_ENABLE_BT_FAULTING));
#if CONFIG_EMBEDDED
trace_flags &= ~(STACKSHOT_SAVE_KEXT_LOADINFO);
#endif
struct stackshot_context ctx = {};
ctx.trace_flags = trace_flags;
ctx.pid = pid;
if (use_fault_path) {
fault_stats.sfs_pages_faulted_in = 0;
fault_stats.sfs_time_spent_faulting = 0;
fault_stats.sfs_stopped_faulting = (uint8_t) FALSE;
}
if (sizeof(void *) == 8) {
system_state_flags |= kKernel64_p;
}
if (stackshot_kcdata_p == NULL || pBytesTraced == NULL) {
error = KERN_INVALID_ARGUMENT;
goto error_exit;
}
clock_timebase_info(&timebase);
*pBytesTraced = 0;
kcd_exit_on_error(kcdata_add_uint32_with_description(stackshot_kcdata_p, trace_flags, "stackshot_in_flags"));
kcd_exit_on_error(kcdata_add_uint32_with_description(stackshot_kcdata_p, (uint32_t)pid, "stackshot_in_pid"));
kcd_exit_on_error(kcdata_add_uint64_with_description(stackshot_kcdata_p, system_state_flags, "system_state_flags"));
#if CONFIG_JETSAM
tmp32 = memorystatus_get_pressure_status_kdp();
kcd_exit_on_error(kcdata_get_memory_addr(stackshot_kcdata_p, STACKSHOT_KCTYPE_JETSAM_LEVEL, sizeof(uint32_t), &out_addr));
stackshot_memcpy((void *)out_addr, &tmp32, sizeof(tmp32));
#endif
if (!collect_delta_stackshot) {
tmp32 = THREAD_POLICY_INTERNAL_STRUCT_VERSION;
kcd_exit_on_error(kcdata_get_memory_addr(stackshot_kcdata_p, STACKSHOT_KCTYPE_THREAD_POLICY_VERSION, sizeof(uint32_t), &out_addr));
stackshot_memcpy((void *)out_addr, &tmp32, sizeof(tmp32));
tmp32 = PAGE_SIZE;
kcd_exit_on_error(kcdata_get_memory_addr(stackshot_kcdata_p, STACKSHOT_KCTYPE_KERN_PAGE_SIZE, sizeof(uint32_t), &out_addr));
stackshot_memcpy((void *)out_addr, &tmp32, sizeof(tmp32));
length_to_copy = MIN((uint32_t)(strlen(version) + 1), OSVERSIZE);
kcd_exit_on_error(kcdata_get_memory_addr(stackshot_kcdata_p, STACKSHOT_KCTYPE_OSVERSION, length_to_copy, &out_addr));
stackshot_strlcpy((char*)out_addr, &version[0], length_to_copy);
length_to_copy = MIN((uint32_t)(strlen(PE_boot_args()) + 1), OSVERSIZE);
kcd_exit_on_error(kcdata_get_memory_addr(stackshot_kcdata_p, STACKSHOT_KCTYPE_BOOTARGS, length_to_copy, &out_addr));
stackshot_strlcpy((char*)out_addr, PE_boot_args(), length_to_copy);
kcd_exit_on_error(kcdata_get_memory_addr(stackshot_kcdata_p, KCDATA_TYPE_TIMEBASE, sizeof(timebase), &out_addr));
stackshot_memcpy((void *)out_addr, &timebase, sizeof(timebase));
} else {
kcd_exit_on_error(kcdata_get_memory_addr(stackshot_kcdata_p, STACKSHOT_KCTYPE_DELTA_SINCE_TIMESTAMP, sizeof(uint64_t), &out_addr));
stackshot_memcpy((void*)out_addr, &stack_snapshot_delta_since_timestamp, sizeof(stack_snapshot_delta_since_timestamp));
}
kcd_exit_on_error(kcdata_get_memory_addr(stackshot_kcdata_p, KCDATA_TYPE_MACH_ABSOLUTE_TIME, sizeof(uint64_t), &out_addr));
abs_time_addr = (uint64_t *)out_addr;
stackshot_memcpy((void *)abs_time_addr, &abs_time, sizeof(uint64_t));
kcd_exit_on_error(kcdata_get_memory_addr(stackshot_kcdata_p, KCDATA_TYPE_USECS_SINCE_EPOCH, sizeof(uint64_t), &out_addr));
stackshot_memcpy((void *)out_addr, &stackshot_microsecs, sizeof(uint64_t));
if (!collect_delta_stackshot && init_task_shared_region &&
ml_validate_nofault((vm_offset_t)init_task_shared_region, sizeof(struct vm_shared_region))) {
struct dyld_uuid_info_64_v2 *sys_shared_cache_info = NULL;
kcd_exit_on_error(kcdata_get_memory_addr(stackshot_kcdata_p, STACKSHOT_KCTYPE_SHAREDCACHE_LOADINFO,
sizeof(struct dyld_uuid_info_64_v2), &out_addr));
sys_shared_cache_info = (struct dyld_uuid_info_64_v2 *)out_addr;
stackshot_memcpy(sys_shared_cache_info->imageUUID, &init_task_shared_region->sr_uuid, sizeof(init_task_shared_region->sr_uuid));
sys_shared_cache_info->imageLoadAddress = init_task_shared_region->sr_slide_info.slide;
sys_shared_cache_info->imageSlidBaseAddress = init_task_shared_region->sr_slide_info.slide + init_task_shared_region->sr_base_address;
if (trace_flags & STACKSHOT_COLLECT_SHAREDCACHE_LAYOUT) {
if (init_task_shared_region->sr_images && ml_validate_nofault((vm_offset_t)init_task_shared_region->sr_images,
(init_task_shared_region->sr_images_count * sizeof(struct dyld_uuid_info_64)))) {
assert(init_task_shared_region->sr_images_count != 0);
kcd_exit_on_error(kcdata_get_memory_addr_for_array(stackshot_kcdata_p, STACKSHOT_KCTYPE_SYS_SHAREDCACHE_LAYOUT,
sizeof(struct dyld_uuid_info_64),
init_task_shared_region->sr_images_count, &out_addr));
stackshot_memcpy((void*)out_addr, init_task_shared_region->sr_images,
(init_task_shared_region->sr_images_count * sizeof(struct dyld_uuid_info_64)));
}
}
}
if (trace_flags & STACKSHOT_GET_GLOBAL_MEM_STATS) {
kcd_exit_on_error(kcdata_get_memory_addr(stackshot_kcdata_p, STACKSHOT_KCTYPE_GLOBAL_MEM_STATS, sizeof(struct mem_and_io_snapshot), &out_addr));
kdp_mem_and_io_snapshot((struct mem_and_io_snapshot *)out_addr);
}
#if CONFIG_COALITIONS
int num_coalitions = 0;
struct jetsam_coalition_snapshot *coalitions = NULL;
#if INTERRUPT_MASKED_DEBUG && MONOTONIC
uint64_t coalition_begin_cpu_cycle_count = 0;
if (!panic_stackshot && (trace_flags & STACKSHOT_SAVE_JETSAM_COALITIONS)) {
coalition_begin_cpu_cycle_count = mt_cur_cpu_cycles();
}
#endif
if (trace_flags & STACKSHOT_SAVE_JETSAM_COALITIONS) {
if (coalition_iterate_stackshot(stackshot_coalition_jetsam_count, &num_coalitions, COALITION_TYPE_JETSAM) != KERN_SUCCESS) {
trace_flags &= ~(STACKSHOT_SAVE_JETSAM_COALITIONS);
}
}
if (trace_flags & STACKSHOT_SAVE_JETSAM_COALITIONS) {
if (num_coalitions > 0) {
kcd_exit_on_error(kcdata_get_memory_addr_for_array(stackshot_kcdata_p, STACKSHOT_KCTYPE_JETSAM_COALITION_SNAPSHOT, sizeof(struct jetsam_coalition_snapshot), num_coalitions, &out_addr));
coalitions = (struct jetsam_coalition_snapshot*)out_addr;
}
if (coalition_iterate_stackshot(stackshot_coalition_jetsam_snapshot, coalitions, COALITION_TYPE_JETSAM) != KERN_SUCCESS) {
error = KERN_FAILURE;
goto error_exit;
}
}
#if INTERRUPT_MASKED_DEBUG && MONOTONIC
if (!panic_stackshot && (coalition_begin_cpu_cycle_count != 0)) {
kcd_exit_on_error(kcdata_add_uint64_with_description(stackshot_kcdata_p, (mt_cur_cpu_cycles() - coalition_begin_cpu_cycle_count),
"coalitions_cpu_cycle_count"));
}
#endif
#else
trace_flags &= ~(STACKSHOT_SAVE_JETSAM_COALITIONS);
#endif
trace_flags &= ~(STACKSHOT_THREAD_GROUP);
queue_iterate(&tasks, task, task_t, tasks)
{
error = kdp_stackshot_record_task(&ctx, task);
if (error) {
goto error_exit;
}
}
queue_iterate(&terminated_tasks, task, task_t, tasks)
{
if (task->bsd_info && !proc_in_teardown(task->bsd_info)) {
error = kdp_stackshot_record_task(&ctx, task);
if (error) {
goto error_exit;
}
}
}
if (use_fault_path) {
kcd_exit_on_error(kcdata_get_memory_addr(stackshot_kcdata_p, STACKSHOT_KCTYPE_STACKSHOT_FAULT_STATS,
sizeof(struct stackshot_fault_stats), &out_addr));
stackshot_memcpy((void*)out_addr, &fault_stats, sizeof(struct stackshot_fault_stats));
}
abs_time_end = mach_absolute_time();
#if DEVELOPMENT || DEBUG
kcd_exit_on_error(kcdata_get_memory_addr(stackshot_kcdata_p, STACKSHOT_KCTYPE_STACKSHOT_DURATION,
sizeof(struct stackshot_duration), &out_addr));
struct stackshot_duration * stackshot_duration = (struct stackshot_duration *)out_addr;
stackshot_duration->stackshot_duration = (abs_time_end - abs_time);
stackshot_duration->stackshot_duration_outer = 0;
stackshot_duration_outer = (unaligned_u64 *)&stackshot_duration->stackshot_duration_outer;
#endif
stackshot_memcpy((void *)abs_time_addr, &abs_time_end, sizeof(uint64_t));
kcd_exit_on_error(kcdata_add_uint32_with_description(stackshot_kcdata_p, trace_flags, "stackshot_out_flags"));
#if INTERRUPT_MASKED_DEBUG && MONOTONIC
if (!panic_stackshot) {
kcd_exit_on_error(kcdata_add_uint64_with_description(stackshot_kcdata_p, (mt_cur_cpu_cycles() - stackshot_begin_cpu_cycle_count),
"stackshot_total_cpu_cycle_cnt"));
}
#endif
kcd_exit_on_error(kcdata_write_buffer_end(stackshot_kcdata_p));
*pBytesTraced = (uint32_t) kcdata_memory_get_used_bytes(stackshot_kcdata_p);
error_exit:
#if INTERRUPT_MASKED_DEBUG
if (!panic_stackshot) {
ml_check_interrupts_disabled_duration(current_thread());
}
#endif
stack_enable_faulting = FALSE;
return error;
}
static uint64_t
proc_was_throttled_from_task(task_t task)
{
uint64_t was_throttled = 0;
if (task->bsd_info) {
was_throttled = proc_was_throttled(task->bsd_info);
}
return was_throttled;
}
static uint64_t
proc_did_throttle_from_task(task_t task)
{
uint64_t did_throttle = 0;
if (task->bsd_info) {
did_throttle = proc_did_throttle(task->bsd_info);
}
return did_throttle;
}
static void
kdp_mem_and_io_snapshot(struct mem_and_io_snapshot *memio_snap)
{
unsigned int pages_reclaimed;
unsigned int pages_wanted;
kern_return_t kErr;
processor_t processor;
vm_statistics64_t stat;
vm_statistics64_data_t host_vm_stat;
processor = processor_list;
stat = &PROCESSOR_DATA(processor, vm_stat);
host_vm_stat = *stat;
if (processor_count > 1) {
while ((processor = processor->processor_list) != NULL) {
stat = &PROCESSOR_DATA(processor, vm_stat);
host_vm_stat.compressions += stat->compressions;
host_vm_stat.decompressions += stat->decompressions;
}
}
memio_snap->snapshot_magic = STACKSHOT_MEM_AND_IO_SNAPSHOT_MAGIC;
memio_snap->free_pages = vm_page_free_count;
memio_snap->active_pages = vm_page_active_count;
memio_snap->inactive_pages = vm_page_inactive_count;
memio_snap->purgeable_pages = vm_page_purgeable_count;
memio_snap->wired_pages = vm_page_wire_count;
memio_snap->speculative_pages = vm_page_speculative_count;
memio_snap->throttled_pages = vm_page_throttled_count;
memio_snap->busy_buffer_count = count_busy_buffers();
memio_snap->filebacked_pages = vm_page_pageable_external_count;
memio_snap->compressions = (uint32_t)host_vm_stat.compressions;
memio_snap->decompressions = (uint32_t)host_vm_stat.decompressions;
memio_snap->compressor_size = VM_PAGE_COMPRESSOR_COUNT;
kErr = mach_vm_pressure_monitor(FALSE, VM_PRESSURE_TIME_WINDOW, &pages_reclaimed, &pages_wanted);
if (!kErr) {
memio_snap->pages_wanted = (uint32_t)pages_wanted;
memio_snap->pages_reclaimed = (uint32_t)pages_reclaimed;
memio_snap->pages_wanted_reclaimed_valid = 1;
} else {
memio_snap->pages_wanted = 0;
memio_snap->pages_reclaimed = 0;
memio_snap->pages_wanted_reclaimed_valid = 0;
}
}
void
stackshot_memcpy(void *dst, const void *src, size_t len)
{
#if CONFIG_EMBEDDED
if (panic_stackshot) {
uint8_t *dest_bytes = (uint8_t *)dst;
const uint8_t *src_bytes = (const uint8_t *)src;
for (size_t i = 0; i < len; i++) {
dest_bytes[i] = src_bytes[i];
}
} else
#endif
memcpy(dst, src, len);
}
size_t
stackshot_strlcpy(char *dst, const char *src, size_t maxlen)
{
const size_t srclen = strlen(src);
if (srclen < maxlen) {
stackshot_memcpy(dst, src, srclen + 1);
} else if (maxlen != 0) {
stackshot_memcpy(dst, src, maxlen - 1);
dst[maxlen - 1] = '\0';
}
return srclen;
}
vm_offset_t
kdp_find_phys(vm_map_t map, vm_offset_t target_addr, boolean_t try_fault, uint32_t *kdp_fault_results)
{
vm_offset_t cur_phys_addr;
unsigned cur_wimg_bits;
uint64_t fault_start_time = 0;
if (map == VM_MAP_NULL) {
return 0;
}
cur_phys_addr = kdp_vtophys(map->pmap, target_addr);
if (!pmap_valid_page((ppnum_t) atop(cur_phys_addr))) {
if (!try_fault || fault_stats.sfs_stopped_faulting) {
if (kdp_fault_results) {
*kdp_fault_results |= KDP_FAULT_RESULT_PAGED_OUT;
}
return 0;
}
fault_start_time = mach_absolute_time();
cur_phys_addr = kdp_lightweight_fault(map, (target_addr & ~PAGE_MASK));
fault_stats.sfs_time_spent_faulting += (mach_absolute_time() - fault_start_time);
if ((fault_stats.sfs_time_spent_faulting >= fault_stats.sfs_system_max_fault_time) && !panic_stackshot) {
fault_stats.sfs_stopped_faulting = (uint8_t) TRUE;
}
cur_phys_addr += (target_addr & PAGE_MASK);
if (!pmap_valid_page((ppnum_t) atop(cur_phys_addr))) {
if (kdp_fault_results) {
*kdp_fault_results |= (KDP_FAULT_RESULT_TRIED_FAULT | KDP_FAULT_RESULT_PAGED_OUT);
}
return 0;
}
if (kdp_fault_results) {
*kdp_fault_results |= KDP_FAULT_RESULT_FAULTED_IN;
}
fault_stats.sfs_pages_faulted_in++;
} else {
cur_wimg_bits = pmap_cache_attributes((ppnum_t) atop(cur_phys_addr));
if ((cur_wimg_bits & VM_WIMG_MASK) != VM_WIMG_DEFAULT) {
return 0;
}
}
return cur_phys_addr;
}
boolean_t
kdp_copyin_word(
task_t task, uint64_t addr, uint64_t *result, boolean_t try_fault, uint32_t *kdp_fault_results)
{
if (task_has_64Bit_addr(task)) {
return kdp_copyin(task->map, addr, result, sizeof(uint64_t), try_fault, kdp_fault_results);
} else {
uint32_t buf;
boolean_t r = kdp_copyin(task->map, addr, &buf, sizeof(uint32_t), try_fault, kdp_fault_results);
*result = buf;
return r;
}
}
int
kdp_copyin_string(
task_t task, uint64_t addr, char *buf, int buf_sz, boolean_t try_fault, uint32_t *kdp_fault_results)
{
int i;
uint64_t validated = 0, valid_from;
uint64_t phys_src, phys_dest;
for (i = 0; i < buf_sz; i++) {
if (validated == 0) {
valid_from = i;
phys_src = kdp_find_phys(task->map, addr + i, try_fault, kdp_fault_results);
phys_dest = kvtophys((vm_offset_t)&buf[i]);
uint64_t src_rem = PAGE_SIZE - (phys_src & PAGE_MASK);
uint64_t dst_rem = PAGE_SIZE - (phys_dest & PAGE_MASK);
if (phys_src && phys_dest) {
validated = MIN(src_rem, dst_rem);
if (validated) {
bcopy_phys(phys_src, phys_dest, 1);
validated--;
} else {
return 0;
}
} else {
return 0;
}
} else {
bcopy_phys(phys_src + (i - valid_from), phys_dest + (i - valid_from), 1);
validated--;
}
if (buf[i] == '\0') {
return i + 1;
}
}
return -1;
}
boolean_t
kdp_copyin(vm_map_t map, uint64_t uaddr, void *dest, size_t size, boolean_t try_fault, uint32_t *kdp_fault_results)
{
size_t rem = size;
char *kvaddr = dest;
#if CONFIG_EMBEDDED
if (panic_stackshot && ((vm_offset_t)dest >= gPanicBase) && ((vm_offset_t)dest < (gPanicBase + gPanicSize))) {
if (((vm_offset_t)dest + size) > (gPanicBase + gPanicSize)) {
return FALSE;
}
}
#endif
while (rem) {
uint64_t phys_src = kdp_find_phys(map, uaddr, try_fault, kdp_fault_results);
uint64_t phys_dest = kvtophys((vm_offset_t)kvaddr);
uint64_t src_rem = PAGE_SIZE - (phys_src & PAGE_MASK);
uint64_t dst_rem = PAGE_SIZE - (phys_dest & PAGE_MASK);
size_t cur_size = (uint32_t) MIN(src_rem, dst_rem);
cur_size = MIN(cur_size, rem);
if (phys_src && phys_dest) {
#if CONFIG_EMBEDDED
if (panic_stackshot) {
stackshot_memcpy(kvaddr, (const void *)phystokv(phys_src), cur_size);
} else
#endif
bcopy_phys(phys_src, phys_dest, cur_size);
} else {
break;
}
uaddr += cur_size;
kvaddr += cur_size;
rem -= cur_size;
}
return rem == 0;
}
kern_return_t
do_stackshot(void *context)
{
#pragma unused(context)
kdp_snapshot++;
stack_snapshot_ret = kdp_stackshot_kcdata_format(stack_snapshot_pid,
stack_snapshot_flags,
&stack_snapshot_bytes_traced);
kdp_snapshot--;
return stack_snapshot_ret;
}
vm_offset_t
machine_trace_thread_get_kva(vm_offset_t cur_target_addr, vm_map_t map, uint32_t *thread_trace_flags)
{
vm_offset_t cur_target_page;
vm_offset_t cur_phys_addr;
vm_offset_t kern_virt_target_addr;
uint32_t kdp_fault_results = 0;
cur_target_page = atop(cur_target_addr);
if ((cur_target_page != prev_target_page) || validate_next_addr) {
cur_phys_addr = kdp_find_phys(map, cur_target_addr, stack_enable_faulting, &kdp_fault_results);
if (thread_trace_flags) {
if (kdp_fault_results & KDP_FAULT_RESULT_PAGED_OUT) {
*thread_trace_flags |= kThreadTruncatedBT;
}
if (kdp_fault_results & KDP_FAULT_RESULT_TRIED_FAULT) {
*thread_trace_flags |= kThreadTriedFaultBT;
}
if (kdp_fault_results & KDP_FAULT_RESULT_FAULTED_IN) {
*thread_trace_flags |= kThreadFaultedBT;
}
}
if (cur_phys_addr == 0) {
return 0;
}
kern_virt_target_addr = phystokv(cur_phys_addr);
prev_target_page = cur_target_page;
prev_target_kva = (kern_virt_target_addr & ~PAGE_MASK);
validate_next_addr = FALSE;
} else {
kern_virt_target_addr = prev_target_kva + (cur_target_addr & PAGE_MASK);
}
#if KASAN
kasan_notify_address(kern_virt_target_addr, sizeof(uint64_t));
#endif
return kern_virt_target_addr;
}
void
machine_trace_thread_clear_validation_cache(void)
{
validate_next_addr = TRUE;
}
boolean_t
stackshot_thread_is_idle_worker_unsafe(thread_t thread)
{
return (thread->state & TH_WAIT) &&
(thread->block_hint == kThreadWaitParkedWorkQueue);
}
#if CONFIG_COALITIONS
static void
stackshot_coalition_jetsam_count(void *arg, int i, coalition_t coal)
{
#pragma unused(i, coal)
unsigned int *coalition_count = (unsigned int*)arg;
(*coalition_count)++;
}
static void
stackshot_coalition_jetsam_snapshot(void *arg, int i, coalition_t coal)
{
if (coalition_type(coal) != COALITION_TYPE_JETSAM) {
return;
}
struct jetsam_coalition_snapshot *coalitions = (struct jetsam_coalition_snapshot*)arg;
struct jetsam_coalition_snapshot *jcs = &coalitions[i];
task_t leader = TASK_NULL;
jcs->jcs_id = coalition_id(coal);
jcs->jcs_flags = 0;
if (coalition_term_requested(coal)) {
jcs->jcs_flags |= kCoalitionTermRequested;
}
if (coalition_is_terminated(coal)) {
jcs->jcs_flags |= kCoalitionTerminated;
}
if (coalition_is_reaped(coal)) {
jcs->jcs_flags |= kCoalitionReaped;
}
if (coalition_is_privileged(coal)) {
jcs->jcs_flags |= kCoalitionPrivileged;
}
leader = kdp_coalition_get_leader(coal);
if (leader) {
jcs->jcs_leader_task_uniqueid = get_task_uniqueid(leader);
} else {
jcs->jcs_leader_task_uniqueid = 0;
}
}
#endif
static int
stackshot_thread_has_valid_waitinfo(thread_t thread)
{
if (!(thread->state & TH_WAIT)) {
return 0;
}
switch (thread->block_hint) {
case kThreadWaitParkedWorkQueue:
case kThreadWaitNone:
return 0;
case kThreadWaitPThreadMutex:
case kThreadWaitPThreadRWLockRead:
case kThreadWaitPThreadRWLockWrite:
case kThreadWaitPThreadCondVar:
return kdp_pthread_get_thread_kwq(thread) != NULL;
default:
return 1;
}
}
static int
stackshot_thread_has_valid_turnstileinfo(thread_t thread)
{
struct turnstile *ts = thread_get_waiting_turnstile(thread);
return stackshot_thread_has_valid_waitinfo(thread) &&
ts != TURNSTILE_NULL;
}
static void
stackshot_thread_turnstileinfo(thread_t thread, thread_turnstileinfo_t *tsinfo)
{
struct turnstile *ts;
ts = thread_get_waiting_turnstile(thread);
tsinfo->waiter = thread_tid(thread);
kdp_turnstile_fill_tsinfo(ts, tsinfo);
}
static void
stackshot_thread_wait_owner_info(thread_t thread, thread_waitinfo_t *waitinfo)
{
waitinfo->waiter = thread_tid(thread);
waitinfo->wait_type = thread->block_hint;
switch (waitinfo->wait_type) {
case kThreadWaitKernelMutex:
kdp_lck_mtx_find_owner(thread->waitq, thread->wait_event, waitinfo);
break;
case kThreadWaitPortReceive:
kdp_mqueue_recv_find_owner(thread->waitq, thread->wait_event, waitinfo);
break;
case kThreadWaitPortSend:
kdp_mqueue_send_find_owner(thread->waitq, thread->wait_event, waitinfo);
break;
case kThreadWaitSemaphore:
kdp_sema_find_owner(thread->waitq, thread->wait_event, waitinfo);
break;
case kThreadWaitUserLock:
kdp_ulock_find_owner(thread->waitq, thread->wait_event, waitinfo);
break;
case kThreadWaitKernelRWLockRead:
case kThreadWaitKernelRWLockWrite:
case kThreadWaitKernelRWLockUpgrade:
kdp_rwlck_find_owner(thread->waitq, thread->wait_event, waitinfo);
break;
case kThreadWaitPThreadMutex:
case kThreadWaitPThreadRWLockRead:
case kThreadWaitPThreadRWLockWrite:
case kThreadWaitPThreadCondVar:
kdp_pthread_find_owner(thread, waitinfo);
break;
case kThreadWaitWorkloopSyncWait:
kdp_workloop_sync_wait_find_owner(thread, thread->wait_event, waitinfo);
break;
case kThreadWaitOnProcess:
kdp_wait4_find_process(thread, thread->wait_event, waitinfo);
break;
case kThreadWaitSleepWithInheritor:
kdp_sleep_with_inheritor_find_owner(thread->waitq, thread->wait_event, waitinfo);
break;
default:
waitinfo->owner = 0;
waitinfo->context = 0;
break;
}
}