/*
- * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2013 Apple Inc. All rights reserved.
*
* @Apple_LICENSE_HEADER_START@
*
#include <sys/kdebug.h>
#include <sys/sysproto.h>
#include <sys/bsdtask_info.h>
+#include <sys/random.h>
+#include <sys/stackshot.h>
#define HZ 100
#include <mach/clock_types.h>
#include <kern/kalloc.h>
#include <kern/cpu_data.h>
#include <kern/assert.h>
+#include <kern/telemetry.h>
+#include <kern/sched_prim.h>
#include <vm/vm_kern.h>
#include <sys/lock.h>
#include <machine/pal_routines.h>
+extern boolean_t kdebug_serial;
+#if KDEBUG_MOJO_TRACE
+#include <sys/kdebugevents.h>
+static void kdebug_serial_print( /* forward */
+ uint32_t, uint32_t, uint64_t,
+ uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
+#endif
+
+/*
+ * IOP(s)
+ *
+ * https://coreoswiki.apple.com/wiki/pages/U6z3i0q9/Consistent_Logging_Implementers_Guide.html
+ *
+ * IOP(s) are auxiliary cores that want to participate in kdebug event logging.
+ * They are registered dynamically. Each is assigned a cpu_id at registration.
+ *
+ * NOTE: IOP trace events may not use the same clock hardware as "normal"
+ * cpus. There is an effort made to synchronize the IOP timebase with the
+ * AP, but it should be understood that there may be discrepancies.
+ *
+ * Once registered, an IOP is permanent, it cannot be unloaded/unregistered.
+ * The current implementation depends on this for thread safety.
+ *
+ * New registrations occur by allocating an kd_iop struct and assigning
+ * a provisional cpu_id of list_head->cpu_id + 1. Then a CAS to claim the
+ * list_head pointer resolves any races.
+ *
+ * You may safely walk the kd_iops list at any time, without holding locks.
+ *
+ * When allocating buffers, the current kd_iops head is captured. Any operations
+ * that depend on the buffer state (such as flushing IOP traces on reads,
+ * etc.) should use the captured list head. This will allow registrations to
+ * take place while trace is in use.
+ */
+
+typedef struct kd_iop {
+ kd_callback_t callback;
+ uint32_t cpu_id;
+ uint64_t last_timestamp; /* Prevent timer rollback */
+ struct kd_iop* next;
+} kd_iop_t;
+
+static kd_iop_t* kd_iops = NULL;
+
/* 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 */
+void commpage_update_kdebug_enable(void); /* XXX sign */
/* XXX should probably be static, but it's debugging code... */
-int kdbg_read(user_addr_t, size_t *, vnode_t, vfs_context_t);
+int kdbg_read(user_addr_t, size_t *, vnode_t, vfs_context_t, uint32_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 *, vnode_t, vfs_context_t);
-int kdbg_getreg(kd_regtype *);
+int kdbg_readcpumap(user_addr_t, size_t *);
+int kdbg_readcurcpumap(user_addr_t, size_t *);
+int kdbg_readthrmap(user_addr_t, size_t *, vnode_t, vfs_context_t);
+int kdbg_readthrmap_v3(user_addr_t, size_t *, int);
+int kdbg_readcurthrmap(user_addr_t, size_t *);
int kdbg_setreg(kd_regtype *);
int kdbg_setrtcdec(kd_regtype *);
int kdbg_setpidex(kd_regtype *);
int kdbg_setpid(kd_regtype *);
-void kdbg_mapinit(void);
+void kdbg_thrmap_init(void);
int kdbg_reinit(boolean_t);
int kdbg_bootstrap(boolean_t);
+int kdbg_cpumap_init_internal(kd_iop_t* iops, uint32_t cpu_count,
+ uint8_t** cpumap, uint32_t* cpumap_size);
+
+kd_threadmap* kdbg_thrmap_init_internal(unsigned int count,
+ unsigned int *mapsize,
+ unsigned int *mapcount);
+
+static boolean_t kdebug_current_proc_enabled(uint32_t debugid);
+static boolean_t kdebug_debugid_enabled(uint32_t debugid);
+static errno_t kdebug_check_trace_string(uint32_t debugid, uint64_t str_id);
+
+int kdbg_write_v3_header(user_addr_t, size_t *, int);
+int kdbg_write_v3_chunk_header(user_addr_t buffer, uint32_t tag,
+ uint32_t sub_tag, uint64_t length,
+ vnode_t vp, vfs_context_t ctx);
+
+user_addr_t kdbg_write_v3_event_chunk_header(user_addr_t buffer, uint32_t tag,
+ uint64_t length, vnode_t vp,
+ vfs_context_t ctx);
+
static int kdbg_enable_typefilter(void);
static int kdbg_disable_typefilter(void);
+static int kdbg_allocate_typefilter(void);
+static int kdbg_deallocate_typefilter(void);
static int create_buffers(boolean_t);
static void delete_buffers(void);
/* trace enable status */
unsigned int kdebug_enable = 0;
-/* track timestamps for security server's entropy needs */
-uint64_t * kd_entropy_buffer = 0;
-unsigned int kd_entropy_bufsize = 0;
-unsigned int kd_entropy_count = 0;
-unsigned int kd_entropy_indx = 0;
-vm_offset_t kd_entropy_buftomem = 0;
-
-#define MAX_ENTROPY_COUNT (128 * 1024)
-
+/* A static buffer to record events prior to the start of regular logging */
+#define KD_EARLY_BUFFER_MAX 64
+static kd_buf kd_early_buffer[KD_EARLY_BUFFER_MAX];
+static int kd_early_index = 0;
+static boolean_t kd_early_overflow = FALSE;
#define SLOW_NOLOG 0x01
#define SLOW_CHECKS 0x02
-#define SLOW_ENTROPY 0x04
#define SLOW_CHUD 0x08
-unsigned int kd_cpus;
-
#define EVENTS_PER_STORAGE_UNIT 2048
#define MIN_STORAGE_UNITS_PER_CPU 4
#define POINTER_FROM_KDS_PTR(x) (&kd_bufs[x.buffer_index].kdsb_addr[x.offset])
-#define NATIVE_TRACE_FACILITY
-
union kds_ptr {
struct {
uint32_t buffer_index:21;
int n_storage_buffers = 0;
int n_storage_threshold = 0;
int kds_waiter = 0;
-int kde_waiter = 0;
#pragma pack(0)
struct kd_bufinfo {
uint32_t _pad;
uint64_t kd_prev_timebase;
uint32_t num_bufs;
-} __attribute__(( aligned(CPU_CACHE_SIZE) ));
+} __attribute__(( aligned(MAX_CPU_CACHE_LINE_SIZE) ));
+
+/*
+ * In principle, this control block can be shared in DRAM with other
+ * coprocessors and runtimes, for configuring what tracing is enabled.
+ */
struct kd_ctrl_page_t {
union kds_ptr kds_free_list;
uint32_t enabled :1;
int kds_inuse_count;
uint32_t kdebug_flags;
uint32_t kdebug_slowcheck;
- uint32_t _pad1;
- struct {
- uint64_t tsc_base;
- uint64_t ns_base;
- } cpu_timebase[32]; // should be max number of actual logical cpus
-} kd_ctrl_page = {.kds_free_list = {.raw = KDS_PTR_NULL}, .enabled = 0, .kds_inuse_count = 0, .kdebug_flags = 0, .kdebug_slowcheck = SLOW_NOLOG};
+ /*
+ * The number of kd_bufinfo structs allocated may not match the current
+ * number of active cpus. We capture the iops list head at initialization
+ * which we could use to calculate the number of cpus we allocated data for,
+ * unless it happens to be null. To avoid that case, we explicitly also
+ * capture a cpu count.
+ */
+ kd_iop_t* kdebug_iops;
+ uint32_t kdebug_cpus;
+} kd_ctrl_page = { .kds_free_list = {.raw = KDS_PTR_NULL}, .kdebug_slowcheck = SLOW_NOLOG };
+
#pragma pack()
struct kd_bufinfo *kdbip = NULL;
#define KDCOPYBUF_COUNT 8192
#define KDCOPYBUF_SIZE (KDCOPYBUF_COUNT * sizeof(kd_buf))
-kd_buf *kdcopybuf = NULL;
+#define PAGE_4KB 4096
+#define PAGE_16KB 16384
-int kdlog_sched_events = 0;
+kd_buf *kdcopybuf = NULL;
boolean_t kdlog_bg_trace = FALSE;
boolean_t kdlog_bg_trace_running = FALSE;
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;
+extern kern_return_t stack_snapshot2(int pid, user_addr_t tracebuf, uint32_t tracebuf_size, uint32_t flags, int32_t *retval);
-void *stackshot_snapbuf = NULL;
+#if CONFIG_TELEMETRY
+extern kern_return_t stack_microstackshot(user_addr_t tracebuf, uint32_t tracebuf_size, uint32_t flags, int32_t *retval);
+#endif /* CONFIG_TELEMETRY */
-int
-stack_snapshot2(pid_t pid, user_addr_t tracebuf, uint32_t tracebuf_size, uint32_t flags, uint32_t dispatch_offset, int32_t *retval);
+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);
-extern void
-kdp_snapshot_preflight(int pid, void *tracebuf, uint32_t tracebuf_size, uint32_t flags, uint32_t dispatch_offset);
+extern kern_return_t stack_snapshot_from_kernel_internal(int pid, void *buf, uint32_t size, uint32_t flags, unsigned *bytes_traced);
-extern int
-kdp_stack_snapshot_geterror(void);
-extern unsigned int
-kdp_stack_snapshot_bytes_traced(void);
+int stack_snapshot_from_kernel(pid_t pid, void *buf, uint32_t size, uint32_t flags, unsigned *bytes_traced);
kd_threadmap *kd_mapptr = 0;
unsigned int kd_mapsize = 0;
unsigned int kd_mapcount = 0;
-vm_offset_t kd_maptomem = 0;
off_t RAW_file_offset = 0;
int RAW_file_written = 0;
#define RAW_FLUSH_SIZE (2 * 1024 * 1024)
-
pid_t global_state_pid = -1; /* Used to control exclusive use of kd_buffer */
-#define DBG_FUNC_MASK 0xfffffffc
+/*
+ * A globally increasing counter for identifying strings in trace. Starts at
+ * 1 because 0 is a reserved return value.
+ */
+__attribute__((aligned(MAX_CPU_CACHE_LINE_SIZE)))
+static uint64_t g_curr_str_id = 1;
-/* TODO: move to kdebug.h */
-#define CLASS_MASK 0xff000000
-#define CLASS_OFFSET 24
-#define SUBCLASS_MASK 0x00ff0000
-#define SUBCLASS_OFFSET 16
-#define CSC_MASK 0xffff0000 /* class and subclass mask */
-#define CSC_OFFSET SUBCLASS_OFFSET
+#define STR_ID_SIG_OFFSET (48)
+#define STR_ID_MASK ((1ULL << STR_ID_SIG_OFFSET) - 1)
+#define STR_ID_SIG_MASK (~STR_ID_MASK)
-#define EXTRACT_CLASS(debugid) ( (uint8_t) ( ((debugid) & CLASS_MASK ) >> CLASS_OFFSET ) )
-#define EXTRACT_SUBCLASS(debugid) ( (uint8_t) ( ((debugid) & SUBCLASS_MASK) >> SUBCLASS_OFFSET ) )
-#define EXTRACT_CSC(debugid) ( (uint16_t)( ((debugid) & CSC_MASK ) >> CSC_OFFSET ) )
+/*
+ * A bit pattern for identifying string IDs generated by
+ * kdebug_trace_string(2).
+ */
+static uint64_t g_str_id_signature = (0x70acULL << STR_ID_SIG_OFFSET);
#define INTERRUPT 0x01050000
#define MACH_vmfault 0x01300008
#define BSC_SysCall 0x040c0000
#define MACH_SysCall 0x010c0000
-#define DBG_SCALL_MASK 0xffff0000
-
/* task to string structure */
struct tts
volatile kd_chudhook_fn kdebug_chudhook = 0; /* pointer to CHUD toolkit function */
-__private_extern__ void stackshot_lock_init( void ) __attribute__((section("__TEXT, initcode")));
-
static uint8_t *type_filter_bitmap;
+/*
+ * This allows kperf to swap out the global state pid when kperf ownership is
+ * passed from one process to another. It checks the old global state pid so
+ * that kperf can't accidentally steal control of trace when a non-kperf trace user has
+ * control of trace.
+ */
+void
+kdbg_swap_global_state_pid(pid_t old_pid, pid_t new_pid);
+
+void
+kdbg_swap_global_state_pid(pid_t old_pid, pid_t new_pid)
+{
+ if (!(kd_ctrl_page.kdebug_flags & KDBG_LOCKINIT))
+ return;
+
+ lck_mtx_lock(kd_trace_mtx_sysctl);
+
+ if (old_pid == global_state_pid)
+ global_state_pid = new_pid;
+
+ lck_mtx_unlock(kd_trace_mtx_sysctl);
+}
+
+static uint32_t
+kdbg_cpu_count(boolean_t early_trace)
+{
+ if (early_trace) {
+ /*
+ * we've started tracing before the IOKit has even
+ * started running... just use the static max value
+ */
+ return max_ncpus;
+ }
+
+ host_basic_info_data_t hinfo;
+ mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
+ host_info((host_t)1 /* BSD_HOST */, HOST_BASIC_INFO, (host_info_t)&hinfo, &count);
+ assert(hinfo.logical_cpu_max > 0);
+ return hinfo.logical_cpu_max;
+}
+
+#if MACH_ASSERT
+#endif /* MACH_ASSERT */
+
+static void
+kdbg_iop_list_callback(kd_iop_t* iop, kd_callback_type type, void* arg)
+{
+ while (iop) {
+ iop->callback.func(iop->callback.context, type, arg);
+ iop = iop->next;
+ }
+}
+
static void
kdbg_set_tracing_enabled(boolean_t enabled, uint32_t trace_type)
{
int s = ml_set_interrupts_enabled(FALSE);
lck_spin_lock(kds_spin_lock);
-
if (enabled) {
kdebug_enable |= trace_type;
kd_ctrl_page.kdebug_slowcheck &= ~SLOW_NOLOG;
kd_ctrl_page.enabled = 1;
+ commpage_update_kdebug_enable();
} else {
kdebug_enable &= ~(KDEBUG_ENABLE_TRACE|KDEBUG_ENABLE_PPT);
kd_ctrl_page.kdebug_slowcheck |= SLOW_NOLOG;
kd_ctrl_page.enabled = 0;
+ commpage_update_kdebug_enable();
}
lck_spin_unlock(kds_spin_lock);
ml_set_interrupts_enabled(s);
+
+ if (enabled) {
+ kdbg_iop_list_callback(kd_ctrl_page.kdebug_iops, KD_CALLBACK_KDEBUG_ENABLED, NULL);
+ } else {
+ /*
+ * If you do not flush the IOP trace buffers, they can linger
+ * for a considerable period; consider code which disables and
+ * deallocates without a final sync flush.
+ */
+ kdbg_iop_list_callback(kd_ctrl_page.kdebug_iops, KD_CALLBACK_KDEBUG_DISABLED, NULL);
+ kdbg_iop_list_callback(kd_ctrl_page.kdebug_iops, KD_CALLBACK_SYNC_FLUSH, NULL);
+ }
}
static void
kd_ctrl_page.kdebug_slowcheck &= ~slowflag;
kdebug_enable &= ~enableflag;
}
+
lck_spin_unlock(kds_spin_lock);
ml_set_interrupts_enabled(s);
}
-
-#ifdef NATIVE_TRACE_FACILITY
void
disable_wrap(uint32_t *old_slowcheck, uint32_t *old_flags)
{
ml_set_interrupts_enabled(s);
}
-void trace_set_timebases(__unused uint64_t tsc, __unused uint64_t ns)
-{
-}
-#else
-/* Begin functions that are defined twice */
-void trace_set_timebases(uint64_t tsc, uint64_t ns)
-{
- int cpu = cpu_number();
- kd_ctrl_page.cpu_timebase[cpu].tsc_base = tsc;
- kd_ctrl_page.cpu_timebase[cpu].ns_base = ns;
-}
-
-#endif
-
static int
-#if defined(__i386__) || defined(__x86_64__)
create_buffers(boolean_t early_trace)
-#else
-create_buffers(__unused boolean_t early_trace)
-#endif
{
int i;
int p_buffer_size;
int f_buffers;
int error = 0;
- /*
- * get the number of cpus and cache it
- */
-#if defined(__i386__) || defined(__x86_64__)
- if (early_trace == TRUE) {
- /*
- * we've started tracing before the
- * IOKit has even started running... just
- * use the static max value
- */
- kd_cpus = max_ncpus;
- } else
-#endif
- {
- host_basic_info_data_t hinfo;
- mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
+ /*
+ * For the duration of this allocation, trace code will only reference
+ * kdebug_iops. Any iops registered after this enabling will not be
+ * messaged until the buffers are reallocated.
+ *
+ * TLDR; Must read kd_iops once and only once!
+ */
+ kd_ctrl_page.kdebug_iops = kd_iops;
-#define BSD_HOST 1
- host_info((host_t)BSD_HOST, HOST_BASIC_INFO, (host_info_t)&hinfo, &count);
- kd_cpus = hinfo.logical_cpu_max;
- }
- if (kmem_alloc(kernel_map, (vm_offset_t *)&kdbip, sizeof(struct kd_bufinfo) * kd_cpus) != KERN_SUCCESS) {
- error = ENOSPC;
- goto out;
- }
- trace_handler_map_bufinfo((uintptr_t)kdbip, sizeof(struct kd_bufinfo) * kd_cpus);
+ /*
+ * If the list is valid, it is sorted, newest -> oldest. Each iop entry
+ * has a cpu_id of "the older entry + 1", so the highest cpu_id will
+ * be the list head + 1.
+ */
+
+ kd_ctrl_page.kdebug_cpus = kd_ctrl_page.kdebug_iops ? kd_ctrl_page.kdebug_iops->cpu_id + 1 : kdbg_cpu_count(early_trace);
-#if !defined(NATIVE_TRACE_FACILITY)
- for(i=0;i<(int)kd_cpus;i++) {
- get_nanotime_timebases(i,
- &kd_ctrl_page.cpu_timebase[i].tsc_base,
- &kd_ctrl_page.cpu_timebase[i].ns_base);
+ if (kmem_alloc(kernel_map, (vm_offset_t *)&kdbip, sizeof(struct kd_bufinfo) * kd_ctrl_page.kdebug_cpus, VM_KERN_MEMORY_DIAG) != KERN_SUCCESS) {
+ error = ENOSPC;
+ goto out;
}
-#endif
- if (nkdbufs < (kd_cpus * EVENTS_PER_STORAGE_UNIT * MIN_STORAGE_UNITS_PER_CPU))
- n_storage_units = kd_cpus * MIN_STORAGE_UNITS_PER_CPU;
+ if (nkdbufs < (kd_ctrl_page.kdebug_cpus * EVENTS_PER_STORAGE_UNIT * MIN_STORAGE_UNITS_PER_CPU))
+ n_storage_units = kd_ctrl_page.kdebug_cpus * MIN_STORAGE_UNITS_PER_CPU;
else
n_storage_units = nkdbufs / EVENTS_PER_STORAGE_UNIT;
kd_bufs = NULL;
if (kdcopybuf == 0) {
- if (kmem_alloc(kernel_map, (vm_offset_t *)&kdcopybuf, (vm_size_t)KDCOPYBUF_SIZE) != KERN_SUCCESS) {
+ if (kmem_alloc(kernel_map, (vm_offset_t *)&kdcopybuf, (vm_size_t)KDCOPYBUF_SIZE, VM_KERN_MEMORY_DIAG) != KERN_SUCCESS) {
error = ENOSPC;
goto out;
}
}
- if (kmem_alloc(kernel_map, (vm_offset_t *)&kd_bufs, (vm_size_t)(n_storage_buffers * sizeof(struct kd_storage_buffers))) != KERN_SUCCESS) {
+ if (kmem_alloc(kernel_map, (vm_offset_t *)&kd_bufs, (vm_size_t)(n_storage_buffers * sizeof(struct kd_storage_buffers)), VM_KERN_MEMORY_DIAG) != KERN_SUCCESS) {
error = ENOSPC;
goto out;
}
bzero(kd_bufs, n_storage_buffers * sizeof(struct kd_storage_buffers));
for (i = 0; i < f_buffers; i++) {
- if (kmem_alloc(kernel_map, (vm_offset_t *)&kd_bufs[i].kdsb_addr, (vm_size_t)f_buffer_size) != KERN_SUCCESS) {
+ if (kmem_alloc(kernel_map, (vm_offset_t *)&kd_bufs[i].kdsb_addr, (vm_size_t)f_buffer_size, VM_KERN_MEMORY_DIAG) != KERN_SUCCESS) {
error = ENOSPC;
goto out;
}
kd_bufs[i].kdsb_size = f_buffer_size;
}
if (p_buffer_size) {
- if (kmem_alloc(kernel_map, (vm_offset_t *)&kd_bufs[i].kdsb_addr, (vm_size_t)p_buffer_size) != KERN_SUCCESS) {
+ if (kmem_alloc(kernel_map, (vm_offset_t *)&kd_bufs[i].kdsb_addr, (vm_size_t)p_buffer_size, VM_KERN_MEMORY_DIAG) != KERN_SUCCESS) {
error = ENOSPC;
goto out;
}
n_elements = kd_bufs[i].kdsb_size / sizeof(struct kd_storage);
kds = kd_bufs[i].kdsb_addr;
- trace_handler_map_buffer(i, (uintptr_t)kd_bufs[i].kdsb_addr, kd_bufs[i].kdsb_size);
-
for (n = 0; n < n_elements; n++) {
kds[n].kds_next.buffer_index = kd_ctrl_page.kds_free_list.buffer_index;
kds[n].kds_next.offset = kd_ctrl_page.kds_free_list.offset;
n_storage_units += n_elements;
}
- bzero((char *)kdbip, sizeof(struct kd_bufinfo) * kd_cpus);
+ bzero((char *)kdbip, sizeof(struct kd_bufinfo) * kd_ctrl_page.kdebug_cpus);
- for (i = 0; i < (int)kd_cpus; i++) {
+ for (i = 0; i < (int)kd_ctrl_page.kdebug_cpus; i++) {
kdbip[i].kd_list_head.raw = KDS_PTR_NULL;
kdbip[i].kd_list_tail.raw = KDS_PTR_NULL;
kdbip[i].kd_lostevents = FALSE;
kdbip[i].num_bufs = 0;
}
-
+
kd_ctrl_page.kdebug_flags |= KDBG_BUFINIT;
kd_ctrl_page.kds_inuse_count = 0;
return(error);
}
-
static void
delete_buffers(void)
{
- int i;
+ int i;
if (kd_bufs) {
for (i = 0; i < n_storage_buffers; i++) {
if (kd_bufs[i].kdsb_addr) {
kmem_free(kernel_map, (vm_offset_t)kd_bufs[i].kdsb_addr, (vm_size_t)kd_bufs[i].kdsb_size);
- trace_handler_unmap_buffer(i);
}
}
kmem_free(kernel_map, (vm_offset_t)kd_bufs, (vm_size_t)(n_storage_buffers * sizeof(struct kd_storage_buffers)));
kd_ctrl_page.kds_free_list.raw = KDS_PTR_NULL;
if (kdbip) {
- trace_handler_unmap_bufinfo();
-
- kmem_free(kernel_map, (vm_offset_t)kdbip, sizeof(struct kd_bufinfo) * kd_cpus);
+ kmem_free(kernel_map, (vm_offset_t)kdbip, sizeof(struct kd_bufinfo) * kd_ctrl_page.kdebug_cpus);
kdbip = NULL;
}
+ kd_ctrl_page.kdebug_iops = NULL;
+ kd_ctrl_page.kdebug_cpus = 0;
kd_ctrl_page.kdebug_flags &= ~KDBG_BUFINIT;
}
-
-#ifdef NATIVE_TRACE_FACILITY
void
release_storage_unit(int cpu, uint32_t kdsp_raw)
{
*/
kdsp_actual = POINTER_FROM_KDS_PTR(kdsp);
kdbp->kd_list_head = kdsp_actual->kds_next;
-
+
kdsp_actual->kds_next = kd_ctrl_page.kds_free_list;
kd_ctrl_page.kds_free_list = kdsp;
kdbp_vict = NULL;
oldest_ts = (uint64_t)-1;
- for (kdbp_try = &kdbip[0]; kdbp_try < &kdbip[kd_cpus]; kdbp_try++) {
+ for (kdbp_try = &kdbip[0]; kdbp_try < &kdbip[kd_ctrl_page.kdebug_cpus]; kdbp_try++) {
if (kdbp_try->kd_list_head.raw == KDS_PTR_NULL) {
/*
if (kdbp_vict == NULL) {
kdebug_enable = 0;
kd_ctrl_page.enabled = 0;
+ commpage_update_kdebug_enable();
retval = FALSE;
goto out;
}
return (retval);
}
-#endif
+
+int
+kernel_debug_register_callback(kd_callback_t callback)
+{
+ kd_iop_t* iop;
+ if (kmem_alloc(kernel_map, (vm_offset_t *)&iop, sizeof(kd_iop_t), VM_KERN_MEMORY_DIAG) == KERN_SUCCESS) {
+ memcpy(&iop->callback, &callback, sizeof(kd_callback_t));
+
+ /*
+ * <rdar://problem/13351477> Some IOP clients are not providing a name.
+ *
+ * Remove when fixed.
+ */
+ {
+ boolean_t is_valid_name = FALSE;
+ for (uint32_t length=0; length<sizeof(callback.iop_name); ++length) {
+ /* This is roughly isprintable(c) */
+ if (callback.iop_name[length] > 0x20 && callback.iop_name[length] < 0x7F)
+ continue;
+ if (callback.iop_name[length] == 0) {
+ if (length)
+ is_valid_name = TRUE;
+ break;
+ }
+ }
+
+ if (!is_valid_name) {
+ strlcpy(iop->callback.iop_name, "IOP-???", sizeof(iop->callback.iop_name));
+ }
+ }
+
+ iop->last_timestamp = 0;
+
+ do {
+ /*
+ * We use two pieces of state, the old list head
+ * pointer, and the value of old_list_head->cpu_id.
+ * If we read kd_iops more than once, it can change
+ * between reads.
+ *
+ * TLDR; Must not read kd_iops more than once per loop.
+ */
+ iop->next = kd_iops;
+ iop->cpu_id = iop->next ? (iop->next->cpu_id+1) : kdbg_cpu_count(FALSE);
+
+ /*
+ * Header says OSCompareAndSwapPtr has a memory barrier
+ */
+ } while (!OSCompareAndSwapPtr(iop->next, iop, (void* volatile*)&kd_iops));
+
+ return iop->cpu_id;
+ }
+
+ return 0;
+}
void
-kernel_debug_internal(
+kernel_debug_enter(
+ uint32_t coreid,
uint32_t debugid,
+ uint64_t timestamp,
uintptr_t arg1,
uintptr_t arg2,
uintptr_t arg3,
uintptr_t arg4,
- uintptr_t arg5,
- int entropy_flag);
+ uintptr_t threadid
+ )
+{
+ uint32_t bindx;
+ kd_buf *kd;
+ struct kd_bufinfo *kdbp;
+ struct kd_storage *kdsp_actual;
+ union kds_ptr kds_raw;
+
+ if (kd_ctrl_page.kdebug_slowcheck) {
+
+ if ( (kd_ctrl_page.kdebug_slowcheck & SLOW_NOLOG) || !(kdebug_enable & (KDEBUG_ENABLE_TRACE|KDEBUG_ENABLE_PPT)))
+ goto out1;
+
+ if (kd_ctrl_page.kdebug_flags & KDBG_TYPEFILTER_CHECK) {
+ /*
+ * Recheck if TYPEFILTER is being used, and if so,
+ * dereference bitmap. If the trace facility is being
+ * disabled, we have ~100ms of preemption-free CPU
+ * usage to access the bitmap.
+ */
+ disable_preemption();
+ if (kd_ctrl_page.kdebug_flags & KDBG_TYPEFILTER_CHECK) {
+ if (isset(type_filter_bitmap, KDBG_EXTRACT_CSC(debugid)))
+ goto record_event_preempt_disabled;
+ }
+ enable_preemption();
+ goto out1;
+ }
+ else if (kd_ctrl_page.kdebug_flags & KDBG_RANGECHECK) {
+ if (debugid >= kdlog_beg && debugid <= kdlog_end)
+ goto record_event;
+ goto out1;
+ }
+ else if (kd_ctrl_page.kdebug_flags & KDBG_VALCHECK) {
+ if ((debugid & KDBG_EVENTID_MASK) != kdlog_value1 &&
+ (debugid & KDBG_EVENTID_MASK) != kdlog_value2 &&
+ (debugid & KDBG_EVENTID_MASK) != kdlog_value3 &&
+ (debugid & KDBG_EVENTID_MASK) != kdlog_value4)
+ goto out1;
+ }
+ }
+
+record_event:
+
+ disable_preemption();
+
+record_event_preempt_disabled:
+ if (kd_ctrl_page.enabled == 0)
+ goto out;
+
+ kdbp = &kdbip[coreid];
+ timestamp &= KDBG_TIMESTAMP_MASK;
+
+#if KDEBUG_MOJO_TRACE
+ if (kdebug_enable & KDEBUG_ENABLE_SERIAL)
+ kdebug_serial_print(coreid, debugid, timestamp,
+ arg1, arg2, arg3, arg4, threadid);
+#endif
+
+retry_q:
+ kds_raw = kdbp->kd_list_tail;
+
+ if (kds_raw.raw != KDS_PTR_NULL) {
+ kdsp_actual = POINTER_FROM_KDS_PTR(kds_raw);
+ bindx = kdsp_actual->kds_bufindx;
+ } else
+ kdsp_actual = NULL;
+
+ if (kdsp_actual == NULL || bindx >= EVENTS_PER_STORAGE_UNIT) {
+ if (allocate_storage_unit(coreid) == FALSE) {
+ /*
+ * this can only happen if wrapping
+ * has been disabled
+ */
+ goto out;
+ }
+ goto retry_q;
+ }
+ if ( !OSCompareAndSwap(bindx, bindx + 1, &kdsp_actual->kds_bufindx))
+ goto retry_q;
+
+ // IOP entries can be allocated before xnu allocates and inits the buffer
+ if (timestamp < kdsp_actual->kds_timestamp)
+ kdsp_actual->kds_timestamp = timestamp;
+
+ kd = &kdsp_actual->kds_records[bindx];
+
+ kd->debugid = debugid;
+ kd->arg1 = arg1;
+ kd->arg2 = arg2;
+ kd->arg3 = arg3;
+ kd->arg4 = arg4;
+ kd->arg5 = threadid;
+
+ kdbg_set_timestamp_and_cpu(kd, timestamp, coreid);
+
+ OSAddAtomic(1, &kdsp_actual->kds_bufcnt);
+out:
+ enable_preemption();
+out1:
+ if ((kds_waiter && kd_ctrl_page.kds_inuse_count >= n_storage_threshold)) {
+ boolean_t need_kds_wakeup = FALSE;
+ int s;
+
+ /*
+ * try to take the lock here to synchronize with the
+ * waiter entering the blocked state... use the try
+ * mode to prevent deadlocks caused by re-entering this
+ * routine due to various trace points triggered in the
+ * lck_spin_sleep_xxxx routines used to actually enter
+ * our wait condition... no problem if we fail,
+ * there will be lots of additional events coming in that
+ * will eventually succeed in grabbing this lock
+ */
+ s = ml_set_interrupts_enabled(FALSE);
+
+ if (lck_spin_try_lock(kdw_spin_lock)) {
+
+ if (kds_waiter && kd_ctrl_page.kds_inuse_count >= n_storage_threshold) {
+ kds_waiter = 0;
+ need_kds_wakeup = TRUE;
+ }
+ lck_spin_unlock(kdw_spin_lock);
+ }
+
+ ml_set_interrupts_enabled(s);
+
+ if (need_kds_wakeup == TRUE)
+ wakeup(&kds_waiter);
+ }
+}
+
+
-__attribute__((always_inline)) void
+static void
kernel_debug_internal(
uint32_t debugid,
uintptr_t arg1,
uintptr_t arg2,
uintptr_t arg3,
uintptr_t arg4,
- uintptr_t arg5,
- int entropy_flag)
+ uintptr_t arg5)
{
struct proc *curproc;
uint64_t now;
chudhook(debugid, arg1, arg2, arg3, arg4, arg5);
ml_set_interrupts_enabled(s);
}
- if ((kdebug_enable & KDEBUG_ENABLE_ENTROPY) && entropy_flag) {
-
- now = mach_absolute_time();
-
- s = ml_set_interrupts_enabled(FALSE);
- lck_spin_lock(kds_spin_lock);
-
- if (kdebug_enable & KDEBUG_ENABLE_ENTROPY) {
-
- if (kd_entropy_indx < kd_entropy_count) {
- kd_entropy_buffer[kd_entropy_indx] = now;
- kd_entropy_indx++;
- }
- if (kd_entropy_indx == kd_entropy_count) {
- /*
- * Disable entropy collection
- */
- kdebug_enable &= ~KDEBUG_ENABLE_ENTROPY;
- kd_ctrl_page.kdebug_slowcheck &= ~SLOW_ENTROPY;
- }
- }
- lck_spin_unlock(kds_spin_lock);
- ml_set_interrupts_enabled(s);
- }
if ( (kd_ctrl_page.kdebug_slowcheck & SLOW_NOLOG) || !(kdebug_enable & (KDEBUG_ENABLE_TRACE|KDEBUG_ENABLE_PPT)))
goto out1;
if (kd_ctrl_page.kdebug_flags & KDBG_TYPEFILTER_CHECK) {
/* Always record trace system info */
- if (EXTRACT_CLASS(debugid) == DBG_TRACE)
+ if (KDBG_EXTRACT_CLASS(debugid) == DBG_TRACE)
goto record_event;
- if (isset(type_filter_bitmap, EXTRACT_CSC(debugid)))
- goto record_event;
+ /*
+ * Recheck if TYPEFILTER is being used, and if so,
+ * dereference bitmap. If the trace facility is being
+ * disabled, we have ~100ms of preemption-free CPU
+ * usage to access the bitmap.
+ */
+ disable_preemption();
+ if (kd_ctrl_page.kdebug_flags & KDBG_TYPEFILTER_CHECK) {
+ if (isset(type_filter_bitmap, KDBG_EXTRACT_CSC(debugid)))
+ goto record_event_preempt_disabled;
+ }
+ enable_preemption();
goto out1;
}
else if (kd_ctrl_page.kdebug_flags & KDBG_RANGECHECK) {
- if ((debugid >= kdlog_beg && debugid <= kdlog_end) || (debugid >> 24) == DBG_TRACE)
- goto record_event;
- if (kdlog_sched_events && (debugid & 0xffff0000) == (MACHDBG_CODE(DBG_MACH_SCHED, 0) | DBG_FUNC_NONE))
+ /* Always record trace system info */
+ if (KDBG_EXTRACT_CLASS(debugid) == DBG_TRACE)
goto record_event;
- goto out1;
+
+ if (debugid < kdlog_beg || debugid > kdlog_end)
+ goto out1;
}
else if (kd_ctrl_page.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))
+ /* Always record trace system info */
+ if (KDBG_EXTRACT_CLASS(debugid) == DBG_TRACE)
+ goto record_event;
+
+ if ((debugid & KDBG_EVENTID_MASK) != kdlog_value1 &&
+ (debugid & KDBG_EVENTID_MASK) != kdlog_value2 &&
+ (debugid & KDBG_EVENTID_MASK) != kdlog_value3 &&
+ (debugid & KDBG_EVENTID_MASK) != kdlog_value4)
goto out1;
}
}
record_event:
disable_preemption();
+
+record_event_preempt_disabled:
+ if (kd_ctrl_page.enabled == 0)
+ goto out;
+
cpu = cpu_number();
kdbp = &kdbip[cpu];
+
+#if KDEBUG_MOJO_TRACE
+ if (kdebug_enable & KDEBUG_ENABLE_SERIAL)
+ kdebug_serial_print(cpu, debugid,
+ mach_absolute_time() & KDBG_TIMESTAMP_MASK,
+ arg1, arg2, arg3, arg4, arg5);
+#endif
+
retry_q:
kds_raw = kdbp->kd_list_tail;
out:
enable_preemption();
out1:
- if ((kds_waiter && kd_ctrl_page.kds_inuse_count >= n_storage_threshold) ||
- (kde_waiter && kd_entropy_indx >= kd_entropy_count)) {
+ if (kds_waiter && kd_ctrl_page.kds_inuse_count >= n_storage_threshold) {
uint32_t etype;
uint32_t stype;
- etype = debugid & DBG_FUNC_MASK;
- stype = debugid & DBG_SCALL_MASK;
+ etype = debugid & KDBG_EVENTID_MASK;
+ stype = debugid & KDBG_CSC_MASK;
if (etype == INTERRUPT || etype == MACH_vmfault ||
stype == BSC_SysCall || stype == MACH_SysCall) {
boolean_t need_kds_wakeup = FALSE;
- boolean_t need_kde_wakeup = FALSE;
/*
* try to take the lock here to synchronize with the
kds_waiter = 0;
need_kds_wakeup = TRUE;
}
- if (kde_waiter && kd_entropy_indx >= kd_entropy_count) {
- kde_waiter = 0;
- need_kde_wakeup = TRUE;
- }
lck_spin_unlock(kdw_spin_lock);
}
ml_set_interrupts_enabled(s);
if (need_kds_wakeup == TRUE)
wakeup(&kds_waiter);
- if (need_kde_wakeup == TRUE)
- wakeup(&kde_waiter);
}
}
}
uintptr_t arg4,
__unused uintptr_t arg5)
{
- kernel_debug_internal(debugid, arg1, arg2, arg3, arg4, (uintptr_t)thread_tid(current_thread()), 1);
+ kernel_debug_internal(debugid, arg1, arg2, arg3, arg4, (uintptr_t)thread_tid(current_thread()));
}
void
uintptr_t arg4,
uintptr_t arg5)
{
- kernel_debug_internal(debugid, arg1, arg2, arg3, arg4, arg5, 1);
+ kernel_debug_internal(debugid, arg1, arg2, arg3, arg4, arg5);
+}
+
+void
+kernel_debug_string_simple(const char *message)
+{
+ uintptr_t arg[4] = {0, 0, 0, 0};
+
+ /* Stuff the message string in the args and log it. */
+ strncpy((char *)arg, message, MIN(sizeof(arg), strlen(message)));
+ KERNEL_DEBUG_EARLY(
+ TRACE_INFO_STRING,
+ arg[0], arg[1], arg[2], arg[3]);
+}
+
+extern int master_cpu; /* MACH_KERNEL_PRIVATE */
+/*
+ * Used prior to start_kern_tracing() being called.
+ * Log temporarily into a static buffer.
+ */
+void
+kernel_debug_early(
+ uint32_t debugid,
+ uintptr_t arg1,
+ uintptr_t arg2,
+ uintptr_t arg3,
+ uintptr_t arg4)
+{
+ /* If tracing is already initialized, use it */
+ if (nkdbufs) {
+ KERNEL_DEBUG_CONSTANT(debugid, arg1, arg2, arg3, arg4, 0);
+ return;
+ }
+
+ /* Do nothing if the buffer is full or we're not on the boot cpu */
+ kd_early_overflow = kd_early_index >= KD_EARLY_BUFFER_MAX;
+ if (kd_early_overflow ||
+ cpu_number() != master_cpu)
+ return;
+
+ kd_early_buffer[kd_early_index].debugid = debugid;
+ kd_early_buffer[kd_early_index].timestamp = mach_absolute_time();
+ kd_early_buffer[kd_early_index].arg1 = arg1;
+ kd_early_buffer[kd_early_index].arg2 = arg2;
+ kd_early_buffer[kd_early_index].arg3 = arg3;
+ kd_early_buffer[kd_early_index].arg4 = arg4;
+ kd_early_buffer[kd_early_index].arg5 = 0;
+ kd_early_index++;
+}
+
+/*
+ * Transfen the contents of the temporary buffer into the trace buffers.
+ * Precede that by logging the rebase time (offset) - the TSC-based time (in ns)
+ * when mach_absolute_time is set to 0.
+ */
+static void
+kernel_debug_early_end(void)
+{
+ int i;
+
+ if (cpu_number() != master_cpu)
+ panic("kernel_debug_early_end() not call on boot processor");
+
+ /* Fake sentinel marking the start of kernel time relative to TSC */
+ kernel_debug_enter(
+ 0,
+ TRACE_TIMESTAMPS,
+ 0,
+ (uint32_t)(tsc_rebase_abs_time >> 32),
+ (uint32_t)tsc_rebase_abs_time,
+ 0,
+ 0,
+ 0);
+ for (i = 0; i < kd_early_index; i++) {
+ kernel_debug_enter(
+ 0,
+ kd_early_buffer[i].debugid,
+ kd_early_buffer[i].timestamp,
+ kd_early_buffer[i].arg1,
+ kd_early_buffer[i].arg2,
+ kd_early_buffer[i].arg3,
+ kd_early_buffer[i].arg4,
+ 0);
+ }
+
+ /* Cut events-lost event on overflow */
+ if (kd_early_overflow)
+ KERNEL_DEBUG_CONSTANT(
+ TRACE_LOST_EVENTS, 0, 0, 0, 0, 0);
+
+ /* This trace marks the start of kernel tracing */
+ kernel_debug_string_simple("early trace done");
+}
+
+/*
+ * Returns non-zero if debugid is in a reserved class.
+ */
+static int
+kdebug_validate_debugid(uint32_t debugid)
+{
+ uint8_t debugid_class;
+
+ debugid_class = KDBG_EXTRACT_CLASS(debugid);
+ switch (debugid_class) {
+ case DBG_TRACE:
+ return EPERM;
+ }
+
+ return 0;
}
/*
- * Support syscall SYS_kdebug_trace
+ * Support syscall SYS_kdebug_trace. U64->K32 args may get truncated in kdebug_trace64
*/
int
-kdebug_trace(__unused struct proc *p, struct kdebug_trace_args *uap, __unused int32_t *retval)
+kdebug_trace(struct proc *p, struct kdebug_trace_args *uap, int32_t *retval)
+{
+ struct kdebug_trace64_args uap64;
+
+ uap64.code = uap->code;
+ uap64.arg1 = uap->arg1;
+ uap64.arg2 = uap->arg2;
+ uap64.arg3 = uap->arg3;
+ uap64.arg4 = uap->arg4;
+
+ return kdebug_trace64(p, &uap64, retval);
+}
+
+/*
+ * Support syscall SYS_kdebug_trace64. 64-bit args on K32 will get truncated to fit in 32-bit record format.
+ */
+int kdebug_trace64(__unused struct proc *p, struct kdebug_trace64_args *uap, __unused int32_t *retval)
{
+ int err;
+
+ if ((err = kdebug_validate_debugid(uap->code)) != 0) {
+ return err;
+ }
+
if ( __probable(kdebug_enable == 0) )
- return(EINVAL);
-
- kernel_debug_internal(uap->code, uap->arg1, uap->arg2, uap->arg3, uap->arg4, (uintptr_t)thread_tid(current_thread()), 0);
+ return(0);
+
+ kernel_debug_internal(uap->code, (uintptr_t)uap->arg1, (uintptr_t)uap->arg2, (uintptr_t)uap->arg3, (uintptr_t)uap->arg4, (uintptr_t)thread_tid(current_thread()));
return(0);
}
+/*
+ * Adding enough padding to contain a full tracepoint for the last
+ * portion of the string greatly simplifies the logic of splitting the
+ * string between tracepoints. Full tracepoints can be generated using
+ * the buffer itself, without having to manually add zeros to pad the
+ * arguments.
+ */
+
+/* 2 string args in first tracepoint and 9 string data tracepoints */
+#define STR_BUF_ARGS (2 + (9 * 4))
+/* times the size of each arg on K64 */
+#define MAX_STR_LEN (STR_BUF_ARGS * sizeof(uint64_t))
+/* on K32, ending straddles a tracepoint, so reserve blanks */
+#define STR_BUF_SIZE (MAX_STR_LEN + (2 * sizeof(uint32_t)))
+
+/*
+ * This function does no error checking and assumes that it is called with
+ * the correct arguments, including that the buffer pointed to by str is at
+ * least STR_BUF_SIZE bytes. However, str must be aligned to word-size and
+ * be NUL-terminated. In cases where a string can fit evenly into a final
+ * tracepoint without its NUL-terminator, this function will not end those
+ * strings with a NUL in trace. It's up to clients to look at the function
+ * qualifier for DBG_FUNC_END in this case, to end the string.
+ */
+static uint64_t
+kernel_debug_string_internal(uint32_t debugid, uint64_t str_id, void *vstr,
+ size_t str_len)
+{
+ /* str must be word-aligned */
+ uintptr_t *str = vstr;
+ size_t written = 0;
+ uintptr_t thread_id;
+ int i;
+ uint32_t trace_debugid = TRACEDBG_CODE(DBG_TRACE_STRING,
+ TRACE_STRING_GLOBAL);
+
+ thread_id = (uintptr_t)thread_tid(current_thread());
+
+ /* if the ID is being invalidated, just emit that */
+ if (str_id != 0 && str_len == 0) {
+ kernel_debug_internal(trace_debugid | DBG_FUNC_START | DBG_FUNC_END,
+ (uintptr_t)debugid, (uintptr_t)str_id, 0, 0,
+ thread_id);
+ return str_id;
+ }
+
+ /* generate an ID, if necessary */
+ if (str_id == 0) {
+ str_id = OSIncrementAtomic64((SInt64 *)&g_curr_str_id);
+ str_id = (str_id & STR_ID_MASK) | g_str_id_signature;
+ }
+
+ trace_debugid |= DBG_FUNC_START;
+ /* string can fit in a single tracepoint */
+ if (str_len <= (2 * sizeof(uintptr_t))) {
+ trace_debugid |= DBG_FUNC_END;
+ }
+
+ kernel_debug_internal(trace_debugid, (uintptr_t)debugid,
+ (uintptr_t)str_id, str[0],
+ str[1], thread_id);
+
+ trace_debugid &= KDBG_EVENTID_MASK;
+ i = 2;
+ written += 2 * sizeof(uintptr_t);
+
+ for (; written < str_len; i += 4, written += 4 * sizeof(uintptr_t)) {
+ if ((written + (4 * sizeof(uintptr_t))) >= str_len) {
+ trace_debugid |= DBG_FUNC_END;
+ }
+ kernel_debug_internal(trace_debugid, str[i],
+ str[i + 1],
+ str[i + 2],
+ str[i + 3], thread_id);
+ }
+
+ return str_id;
+}
+
+/*
+ * Returns true if the current process can emit events, and false otherwise.
+ * Trace system and scheduling events circumvent this check, as do events
+ * emitted in interrupt context.
+ */
+static boolean_t
+kdebug_current_proc_enabled(uint32_t debugid)
+{
+ /* can't determine current process in interrupt context */
+ if (ml_at_interrupt_context()) {
+ return TRUE;
+ }
+
+ /* always emit trace system and scheduling events */
+ if ((KDBG_EXTRACT_CLASS(debugid) == DBG_TRACE ||
+ (debugid & KDBG_CSC_MASK) == MACHDBG_CODE(DBG_MACH_SCHED, 0)))
+ {
+ return TRUE;
+ }
+
+ if (kd_ctrl_page.kdebug_flags & KDBG_PIDCHECK) {
+ proc_t cur_proc = current_proc();
+
+ /* only the process with the kdebug bit set is allowed */
+ if (cur_proc && !(cur_proc->p_kdebug)) {
+ return FALSE;
+ }
+ } else if (kd_ctrl_page.kdebug_flags & KDBG_PIDEXCLUDE) {
+ proc_t cur_proc = current_proc();
+
+ /* every process except the one with the kdebug bit set is allowed */
+ if (cur_proc && cur_proc->p_kdebug) {
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}
+
+/*
+ * Returns true if the debugid is disabled by filters, and false if the
+ * debugid is allowed to be traced. A debugid may not be traced if the
+ * typefilter disables its class and subclass, it's outside a range
+ * check, or if it's not an allowed debugid in a value check. Trace
+ * system events bypass this check.
+ */
+static boolean_t
+kdebug_debugid_enabled(uint32_t debugid)
+{
+ boolean_t is_enabled = TRUE;
+
+ /* if no filtering is enabled */
+ if (!kd_ctrl_page.kdebug_slowcheck) {
+ return TRUE;
+ }
+
+ if (KDBG_EXTRACT_CLASS(debugid) == DBG_TRACE) {
+ return TRUE;
+ }
+
+ if (kd_ctrl_page.kdebug_flags & KDBG_TYPEFILTER_CHECK) {
+ disable_preemption();
+
+ /*
+ * Recheck if typefilter is still being used. If tracing is being
+ * disabled, there's a 100ms sleep on the other end to keep the
+ * bitmap around for this check.
+ */
+ if (kd_ctrl_page.kdebug_flags & KDBG_TYPEFILTER_CHECK) {
+ if (!(isset(type_filter_bitmap, KDBG_EXTRACT_CSC(debugid)))) {
+ is_enabled = FALSE;
+ }
+ }
+
+ enable_preemption();
+ } else if (kd_ctrl_page.kdebug_flags & KDBG_RANGECHECK) {
+ if (debugid < kdlog_beg || debugid > kdlog_end) {
+ is_enabled = FALSE;
+ }
+ } else if (kd_ctrl_page.kdebug_flags & KDBG_VALCHECK) {
+ if ((debugid & KDBG_EVENTID_MASK) != kdlog_value1 &&
+ (debugid & KDBG_EVENTID_MASK) != kdlog_value2 &&
+ (debugid & KDBG_EVENTID_MASK) != kdlog_value3 &&
+ (debugid & KDBG_EVENTID_MASK) != kdlog_value4)
+ {
+ is_enabled = FALSE;
+ }
+ }
+
+ return is_enabled;
+}
+
+/*
+ * Returns 0 if a string can be traced with these arguments. Returns errno
+ * value if error occurred.
+ */
+static errno_t
+kdebug_check_trace_string(uint32_t debugid, uint64_t str_id)
+{
+ /* if there are function qualifiers on the debugid */
+ if (debugid & ~KDBG_EVENTID_MASK) {
+ return EINVAL;
+ }
+
+ if (kdebug_validate_debugid(debugid)) {
+ return EPERM;
+ }
+
+ if (str_id != 0 && (str_id & STR_ID_SIG_MASK) != g_str_id_signature) {
+ return EINVAL;
+ }
+
+ return 0;
+}
+
+/*
+ * Implementation of KPI kernel_debug_string.
+ */
+int
+kernel_debug_string(uint32_t debugid, uint64_t *str_id, const char *str)
+{
+ /* arguments to tracepoints must be word-aligned */
+ __attribute__((aligned(sizeof(uintptr_t)))) char str_buf[STR_BUF_SIZE];
+ assert_static(sizeof(str_buf) > MAX_STR_LEN);
+ vm_size_t len_copied;
+ int err;
+
+ assert(str_id);
+
+ if (__probable(kdebug_enable == 0)) {
+ return 0;
+ }
+
+ if (!kdebug_current_proc_enabled(debugid)) {
+ return 0;
+ }
+
+ if (!kdebug_debugid_enabled(debugid)) {
+ return 0;
+ }
+
+ if ((err = kdebug_check_trace_string(debugid, *str_id)) != 0) {
+ return err;
+ }
+
+ if (str == NULL) {
+ if (str_id == 0) {
+ return EINVAL;
+ }
+
+ *str_id = kernel_debug_string_internal(debugid, *str_id, NULL, 0);
+ return 0;
+ }
+
+ memset(str_buf, 0, sizeof(str_buf));
+ len_copied = strlcpy(str_buf, str, MAX_STR_LEN + 1);
+ *str_id = kernel_debug_string_internal(debugid, *str_id, str_buf,
+ len_copied);
+ return 0;
+}
+
+/*
+ * Support syscall kdebug_trace_string.
+ */
+int
+kdebug_trace_string(__unused struct proc *p,
+ struct kdebug_trace_string_args *uap,
+ uint64_t *retval)
+{
+ __attribute__((aligned(sizeof(uintptr_t)))) char str_buf[STR_BUF_SIZE];
+ assert_static(sizeof(str_buf) > MAX_STR_LEN);
+ size_t len_copied;
+ int err;
+
+ if (__probable(kdebug_enable == 0)) {
+ return 0;
+ }
+
+ if (!kdebug_current_proc_enabled(uap->debugid)) {
+ return 0;
+ }
+
+ if (!kdebug_debugid_enabled(uap->debugid)) {
+ return 0;
+ }
+
+ if ((err = kdebug_check_trace_string(uap->debugid, uap->str_id)) != 0) {
+ return err;
+ }
+
+ if (uap->str == USER_ADDR_NULL) {
+ if (uap->str_id == 0) {
+ return EINVAL;
+ }
+
+ *retval = kernel_debug_string_internal(uap->debugid, uap->str_id,
+ NULL, 0);
+ return 0;
+ }
+
+ memset(str_buf, 0, sizeof(str_buf));
+ err = copyinstr(uap->str, str_buf, MAX_STR_LEN + 1, &len_copied);
+
+ /* it's alright to truncate the string, so allow ENAMETOOLONG */
+ if (err == ENAMETOOLONG) {
+ str_buf[MAX_STR_LEN] = '\0';
+ } else if (err) {
+ return err;
+ }
+
+ if (len_copied <= 1) {
+ return EINVAL;
+ }
+
+ /* convert back to a length */
+ len_copied--;
+
+ *retval = kernel_debug_string_internal(uap->debugid, uap->str_id, str_buf,
+ len_copied);
+ return 0;
+}
static void
kdbg_lock_init(void)
{
if (kd_ctrl_page.kdebug_flags & KDBG_LOCKINIT)
return;
-
- trace_handler_map_ctrl_page((uintptr_t)&kd_ctrl_page, sizeof(kd_ctrl_page), sizeof(struct kd_storage), sizeof(union kds_ptr));
/*
* allocate lock group attribute and group
kmem_free(kernel_map, (vm_offset_t)kd_mapptr, kd_mapsize);
kd_ctrl_page.kdebug_flags &= ~KDBG_MAPINIT;
kd_mapsize = 0;
- kd_mapptr = (kd_threadmap *) 0;
+ kd_mapptr = NULL;
kd_mapcount = 0;
}
ret = kdbg_bootstrap(early_trace);
}
}
+/*
+ *
+ * Writes a cpumap for the given iops_list/cpu_count to the provided buffer.
+ *
+ * You may provide a buffer and size, or if you set the buffer to NULL, a
+ * buffer of sufficient size will be allocated.
+ *
+ * If you provide a buffer and it is too small, sets cpumap_size to the number
+ * of bytes required and returns EINVAL.
+ *
+ * On success, if you provided a buffer, cpumap_size is set to the number of
+ * bytes written. If you did not provide a buffer, cpumap is set to the newly
+ * allocated buffer and cpumap_size is set to the number of bytes allocated.
+ *
+ * NOTE: It may seem redundant to pass both iops and a cpu_count.
+ *
+ * We may be reporting data from "now", or from the "past".
+ *
+ * The "now" data would be for something like kdbg_readcurcpumap().
+ * The "past" data would be for kdbg_readcpumap().
+ *
+ * If we do not pass both iops and cpu_count, and iops is NULL, this function
+ * will need to read "now" state to get the number of cpus, which would be in
+ * error if we were reporting "past" state.
+ */
+
+int
+kdbg_cpumap_init_internal(kd_iop_t* iops, uint32_t cpu_count, uint8_t** cpumap, uint32_t* cpumap_size)
+{
+ assert(cpumap);
+ assert(cpumap_size);
+ assert(cpu_count);
+ assert(!iops || iops->cpu_id + 1 == cpu_count);
+
+ uint32_t bytes_needed = sizeof(kd_cpumap_header) + cpu_count * sizeof(kd_cpumap);
+ uint32_t bytes_available = *cpumap_size;
+ *cpumap_size = bytes_needed;
+
+ if (*cpumap == NULL) {
+ if (kmem_alloc(kernel_map, (vm_offset_t*)cpumap, (vm_size_t)*cpumap_size, VM_KERN_MEMORY_DIAG) != KERN_SUCCESS) {
+ return ENOMEM;
+ }
+ } else if (bytes_available < bytes_needed) {
+ return EINVAL;
+ }
+
+ kd_cpumap_header* header = (kd_cpumap_header*)(uintptr_t)*cpumap;
+
+ header->version_no = RAW_VERSION1;
+ header->cpu_count = cpu_count;
+
+ kd_cpumap* cpus = (kd_cpumap*)&header[1];
+
+ int32_t index = cpu_count - 1;
+ while (iops) {
+ cpus[index].cpu_id = iops->cpu_id;
+ cpus[index].flags = KDBG_CPUMAP_IS_IOP;
+ bzero(cpus[index].name, sizeof(cpus->name));
+ strlcpy(cpus[index].name, iops->callback.iop_name, sizeof(cpus->name));
+
+ iops = iops->next;
+ index--;
+ }
+
+ while (index >= 0) {
+ cpus[index].cpu_id = index;
+ cpus[index].flags = 0;
+ bzero(cpus[index].name, sizeof(cpus->name));
+ strlcpy(cpus[index].name, "AP", sizeof(cpus->name));
+
+ index--;
+ }
+
+ return KERN_SUCCESS;
+}
+
void
-kdbg_mapinit(void)
+kdbg_thrmap_init(void)
{
+ if (kd_ctrl_page.kdebug_flags & KDBG_MAPINIT)
+ return;
+
+ kd_mapptr = kdbg_thrmap_init_internal(0, &kd_mapsize, &kd_mapcount);
+
+ if (kd_mapptr)
+ kd_ctrl_page.kdebug_flags |= KDBG_MAPINIT;
+}
+
+
+kd_threadmap* kdbg_thrmap_init_internal(unsigned int count, unsigned int *mapsize, unsigned int *mapcount)
+{
+ kd_threadmap *mapptr;
struct proc *p;
struct krt akrt;
int tts_count; /* number of task-to-string structures */
struct tts *tts_mapptr;
unsigned int tts_mapsize = 0;
- vm_offset_t tts_maptomem=0;
int i;
-
- if (kd_ctrl_page.kdebug_flags & KDBG_MAPINIT)
- return;
+ vm_offset_t kaddr;
/*
* need to use PROC_SCANPROCLIST with proc_iterate
/*
* Calculate the sizes of map buffers
*/
- for (p = allproc.lh_first, kd_mapcount=0, tts_count=0; p; p = p->p_list.le_next) {
- kd_mapcount += get_task_numacts((task_t)p->task);
+ for (p = allproc.lh_first, *mapcount=0, tts_count=0; p; p = p->p_list.le_next) {
+ *mapcount += get_task_numacts((task_t)p->task);
tts_count++;
}
proc_list_unlock();
* The proc count could change during buffer allocation,
* so introduce a small fudge factor to bump up the
* buffer sizes. This gives new tasks some chance of
- * making into the tables. Bump up by 10%.
+ * making into the tables. Bump up by 25%.
*/
- kd_mapcount += kd_mapcount/10;
- tts_count += tts_count/10;
+ *mapcount += *mapcount/4;
+ tts_count += tts_count/4;
+
+ *mapsize = *mapcount * sizeof(kd_threadmap);
- kd_mapsize = kd_mapcount * sizeof(kd_threadmap);
+ if (count && count < *mapcount)
+ return (0);
- if ((kmem_alloc(kernel_map, & kd_maptomem, (vm_size_t)kd_mapsize) == KERN_SUCCESS)) {
- kd_mapptr = (kd_threadmap *) kd_maptomem;
- bzero(kd_mapptr, kd_mapsize);
+ if ((kmem_alloc(kernel_map, &kaddr, (vm_size_t)*mapsize, VM_KERN_MEMORY_DIAG) == KERN_SUCCESS)) {
+ bzero((void *)kaddr, *mapsize);
+ mapptr = (kd_threadmap *)kaddr;
} else
- kd_mapptr = (kd_threadmap *) 0;
+ return (0);
tts_mapsize = tts_count * sizeof(struct tts);
- if ((kmem_alloc(kernel_map, & tts_maptomem, (vm_size_t)tts_mapsize) == KERN_SUCCESS)) {
- tts_mapptr = (struct tts *) tts_maptomem;
- bzero(tts_mapptr, tts_mapsize);
- } else
- tts_mapptr = (struct tts *) 0;
+ if ((kmem_alloc(kernel_map, &kaddr, (vm_size_t)tts_mapsize, VM_KERN_MEMORY_DIAG) == KERN_SUCCESS)) {
+ bzero((void *)kaddr, tts_mapsize);
+ tts_mapptr = (struct tts *)kaddr;
+ } else {
+ kmem_free(kernel_map, (vm_offset_t)mapptr, *mapsize);
+ return (0);
+ }
/*
* We need to save the procs command string
* and take a reference for each task associated
* with a valid process
*/
- 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_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)strlcpy(tts_mapptr[i].task_comm, p->p_comm, sizeof(tts_mapptr[i].task_comm));
- i++;
- }
- }
- tts_count = i;
- proc_list_unlock();
+ proc_list_lock();
+
+ /*
+ * should use proc_iterate
+ */
+ for (p = allproc.lh_first, i=0; p && i < tts_count; p = p->p_list.le_next) {
+ 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)strlcpy(tts_mapptr[i].task_comm, p->p_comm, sizeof(tts_mapptr[i].task_comm));
+ i++;
+ }
}
+ tts_count = i;
- if (kd_mapptr && tts_mapptr) {
- kd_ctrl_page.kdebug_flags |= KDBG_MAPINIT;
+ proc_list_unlock();
- /*
- * Initialize thread map data
- */
- akrt.map = kd_mapptr;
- akrt.count = 0;
- akrt.maxcount = kd_mapcount;
+ /*
+ * Initialize thread map data
+ */
+ akrt.map = mapptr;
+ akrt.count = 0;
+ akrt.maxcount = *mapcount;
- for (i = 0; i < tts_count; i++) {
- akrt.atts = &tts_mapptr[i];
- task_act_iterate_wth_args(tts_mapptr[i].task, kdbg_resolve_map, &akrt);
- task_deallocate((task_t) tts_mapptr[i].task);
- }
- kmem_free(kernel_map, (vm_offset_t)tts_mapptr, tts_mapsize);
+ for (i = 0; i < tts_count; i++) {
+ akrt.atts = &tts_mapptr[i];
+ task_act_iterate_wth_args(tts_mapptr[i].task, kdbg_resolve_map, &akrt);
+ task_deallocate((task_t) tts_mapptr[i].task);
}
+ kmem_free(kernel_map, (vm_offset_t)tts_mapptr, tts_mapsize);
+
+ *mapcount = akrt.count;
+
+ return (mapptr);
}
static void
kdbg_clear(void)
{
- /*
+ /*
* Clean up the trace buffer
* First make sure we're not in
* the middle of cutting a trace
*/
kdbg_set_tracing_enabled(FALSE, KDEBUG_ENABLE_TRACE);
+ kdbg_disable_typefilter();
/*
* make sure the SLOW_NOLOG is seen
*/
IOSleep(100);
- kdlog_sched_events = 0;
- global_state_pid = -1;
+ global_state_pid = -1;
kd_ctrl_page.kdebug_flags &= (unsigned int)~KDBG_CKTYPES;
kd_ctrl_page.kdebug_flags &= ~(KDBG_NOWRAP | KDBG_RANGECHECK | KDBG_VALCHECK);
kd_ctrl_page.kdebug_flags &= ~(KDBG_PIDCHECK | KDBG_PIDEXCLUDE);
- kdbg_disable_typefilter();
-
+ kdbg_deallocate_typefilter();
delete_buffers();
nkdbufs = 0;
int
kdbg_enable_typefilter(void)
{
- if (kd_ctrl_page.kdebug_flags & KDBG_TYPEFILTER_CHECK) {
- /* free the old filter */
- kdbg_disable_typefilter();
- }
-
- if (kmem_alloc(kernel_map, (vm_offset_t *)&type_filter_bitmap, KDBG_TYPEFILTER_BITMAP_SIZE) != KERN_SUCCESS) {
- return ENOSPC;
+ int ret;
+
+ /* Allocate memory for bitmap if not already allocated */
+ ret = kdbg_allocate_typefilter();
+ if (ret) {
+ return ret;
}
-
- bzero(type_filter_bitmap, KDBG_TYPEFILTER_BITMAP_SIZE);
/* Turn off range and value checks */
kd_ctrl_page.kdebug_flags &= ~(KDBG_RANGECHECK | KDBG_VALCHECK);
{
/* Disable filter checking */
kd_ctrl_page.kdebug_flags &= ~KDBG_TYPEFILTER_CHECK;
-
+
/* Turn off slow checks unless pid checks are using them */
if ( (kd_ctrl_page.kdebug_flags & (KDBG_PIDCHECK | KDBG_PIDEXCLUDE)) )
kdbg_set_flags(SLOW_CHECKS, 0, TRUE);
else
kdbg_set_flags(SLOW_CHECKS, 0, FALSE);
-
- if(type_filter_bitmap == NULL)
- return 0;
- vm_offset_t old_bitmap = (vm_offset_t)type_filter_bitmap;
- type_filter_bitmap = NULL;
+ /* typefilter bitmap will be deallocated later */
+
+ return 0;
+}
+
+static int
+kdbg_allocate_typefilter(void)
+{
+ if (type_filter_bitmap == NULL) {
+ vm_offset_t bitmap = 0;
+
+ if (kmem_alloc(kernel_map, &bitmap, KDBG_TYPEFILTER_BITMAP_SIZE, VM_KERN_MEMORY_DIAG) != KERN_SUCCESS) {
+ return ENOSPC;
+ }
+
+ bzero((void *)bitmap, KDBG_TYPEFILTER_BITMAP_SIZE);
+
+ if (!OSCompareAndSwapPtr(NULL, (void *)bitmap, &type_filter_bitmap)) {
+ kmem_free(kernel_map, bitmap, KDBG_TYPEFILTER_BITMAP_SIZE);
+ return 0; /* someone assigned a buffer */
+ }
+ } else {
+ bzero(type_filter_bitmap, KDBG_TYPEFILTER_BITMAP_SIZE);
+ }
+
+ return 0;
+}
+
+static int
+kdbg_deallocate_typefilter(void)
+{
+ if(type_filter_bitmap) {
+ vm_offset_t bitmap = (vm_offset_t)type_filter_bitmap;
+
+ if (OSCompareAndSwapPtr((void *)bitmap, NULL, &type_filter_bitmap)) {
+ kmem_free(kernel_map, bitmap, KDBG_TYPEFILTER_BITMAP_SIZE);
+ return 0;
+ } else {
+ /* already swapped */
+ }
+ }
- kmem_free(kernel_map, old_bitmap, KDBG_TYPEFILTER_BITMAP_SIZE);
return 0;
}
{
int ret=0;
unsigned int val_1, val_2, val;
-
- kdlog_sched_events = 0;
-
switch (kdr->type) {
case KDBG_CLASSTYPE :
val_1 = (kdr->value1 & 0xff);
val_2 = (kdr->value2 & 0xff);
-
- if (val_1 == DBG_FSYSTEM && val_2 == (DBG_FSYSTEM + 1))
- kdlog_sched_events = 1;
-
kdlog_beg = (val_1<<24);
kdlog_end = (val_2<<24);
kd_ctrl_page.kdebug_flags &= (unsigned int)~KDBG_CKTYPES;
return(ret);
}
+static int
+kdbg_write_to_vnode(caddr_t buffer, size_t size, vnode_t vp, vfs_context_t ctx, off_t file_offset)
+{
+ return vn_rdwr(UIO_WRITE, vp, buffer, size, file_offset, UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT,
+ vfs_context_ucred(ctx), (int *) 0, vfs_context_proc(ctx));
+}
+
int
-kdbg_getreg(__unused kd_regtype * kdr)
+kdbg_write_v3_chunk_header(user_addr_t buffer, uint32_t tag, uint32_t sub_tag, uint64_t length, vnode_t vp, vfs_context_t ctx)
{
-#if 0
- int i,j, ret=0;
- unsigned int val_1, val_2, val;
+ int ret = KERN_SUCCESS;
+ kd_chunk_header_v3 header;
+
+ header.tag = tag;
+ header.sub_tag = sub_tag;
+ header.length = length;
+
+ // Check that only one of them is valid
+ assert(!buffer ^ !vp);
+ assert((vp == NULL) || (ctx != NULL));
+
+ // Write the 8-byte future_chunk_timestamp field in the payload
+ if (buffer || vp) {
+ if (vp) {
+ ret = kdbg_write_to_vnode((caddr_t)&header, sizeof(kd_chunk_header_v3), vp, ctx, RAW_file_offset);
+ if (ret) {
+ goto write_error;
+ }
+ RAW_file_offset += (sizeof(kd_chunk_header_v3));
+ }
+ else {
+ ret = copyout(&header, buffer, sizeof(kd_chunk_header_v3));
+ if (ret) {
+ goto write_error;
+ }
+ }
+ }
+write_error:
+ return ret;
+}
- switch (kdr->type) {
- case KDBG_CLASSTYPE :
- val_1 = (kdr->value1 & 0xff);
- val_2 = val_1 + 1;
- kdlog_beg = (val_1<<24);
- kdlog_end = (val_2<<24);
- kd_ctrl_page.kdebug_flags &= (unsigned int)~KDBG_CKTYPES;
- kd_ctrl_page.kdebug_flags |= (KDBG_RANGECHECK | KDBG_CLASSTYPE);
- break;
- case KDBG_SUBCLSTYPE :
- val_1 = (kdr->value1 & 0xff);
- val_2 = (kdr->value2 & 0xff);
- val = val_2 + 1;
- kdlog_beg = ((val_1<<24) | (val_2 << 16));
- kdlog_end = ((val_1<<24) | (val << 16));
- kd_ctrl_page.kdebug_flags &= (unsigned int)~KDBG_CKTYPES;
- kd_ctrl_page.kdebug_flags |= (KDBG_RANGECHECK | KDBG_SUBCLSTYPE);
- break;
- case KDBG_RANGETYPE :
- kdlog_beg = (kdr->value1);
- kdlog_end = (kdr->value2);
- kd_ctrl_page.kdebug_flags &= (unsigned int)~KDBG_CKTYPES;
- kd_ctrl_page.kdebug_flags |= (KDBG_RANGECHECK | KDBG_RANGETYPE);
- break;
- case KDBG_TYPENONE :
- kd_ctrl_page.kdebug_flags &= (unsigned int)~KDBG_CKTYPES;
- kdlog_beg = 0;
- kdlog_end = 0;
- break;
- default :
- ret = EINVAL;
- break;
+int
+kdbg_write_v3_chunk_header_to_buffer(void * buffer, uint32_t tag, uint32_t sub_tag, uint64_t length)
+{
+ kd_chunk_header_v3 header;
+
+ header.tag = tag;
+ header.sub_tag = sub_tag;
+ header.length = length;
+
+ if (!buffer) {
+ return 0;
+ }
+
+ memcpy(buffer, &header, sizeof(kd_chunk_header_v3));
+
+ return (sizeof(kd_chunk_header_v3));
+}
+
+int
+kdbg_write_v3_chunk_to_fd(uint32_t tag, uint32_t sub_tag, uint64_t length, void *payload, uint64_t payload_size, int fd)
+{
+ proc_t p;
+ struct vfs_context context;
+ struct fileproc *fp;
+ vnode_t vp;
+ p = current_proc();
+
+ proc_fdlock(p);
+ if ( (fp_lookup(p, fd, &fp, 1)) ) {
+ proc_fdunlock(p);
+ return EFAULT;
+ }
+
+ context.vc_thread = current_thread();
+ context.vc_ucred = fp->f_fglob->fg_cred;
+
+ if (FILEGLOB_DTYPE(fp->f_fglob) != DTYPE_VNODE) {
+ fp_drop(p, fd, fp, 1);
+ proc_fdunlock(p);
+ return EBADF;
}
-#endif /* 0 */
- return(EINVAL);
+ vp = (struct vnode *) fp->f_fglob->fg_data;
+ proc_fdunlock(p);
+
+ if ( (vnode_getwithref(vp)) == 0 ) {
+ RAW_file_offset = fp->f_fglob->fg_offset;
+
+ kd_chunk_header_v3 chunk_header = { .tag = tag, .sub_tag = sub_tag, .length = length };
+
+ int ret = kdbg_write_to_vnode((caddr_t) &chunk_header, sizeof(kd_chunk_header_v3), vp, &context, RAW_file_offset);
+ if (!ret) {
+ RAW_file_offset += sizeof(kd_chunk_header_v3);
+ }
+
+ ret = kdbg_write_to_vnode((caddr_t) payload, (size_t) payload_size, vp, &context, RAW_file_offset);
+ if (!ret) {
+ RAW_file_offset += payload_size;
+ }
+
+ fp->f_fglob->fg_offset = RAW_file_offset;
+ vnode_put(vp);
+ }
+
+ fp_drop(p, fd, fp, 0);
+ return KERN_SUCCESS;
+}
+
+user_addr_t
+kdbg_write_v3_event_chunk_header(user_addr_t buffer, uint32_t tag, uint64_t length, vnode_t vp, vfs_context_t ctx)
+{
+ uint64_t future_chunk_timestamp = 0;
+ length += sizeof(uint64_t);
+
+ if (kdbg_write_v3_chunk_header(buffer, tag, V3_EVENT_DATA_VERSION, length, vp, ctx)) {
+ return 0;
+ }
+ if (buffer) {
+ buffer += sizeof(kd_chunk_header_v3);
+ }
+
+ // Check that only one of them is valid
+ assert(!buffer ^ !vp);
+ assert((vp == NULL) || (ctx != NULL));
+
+ // Write the 8-byte future_chunk_timestamp field in the payload
+ if (buffer || vp) {
+ if (vp) {
+ int ret = kdbg_write_to_vnode((caddr_t)&future_chunk_timestamp, sizeof(uint64_t), vp, ctx, RAW_file_offset);
+ if (!ret) {
+ RAW_file_offset += (sizeof(uint64_t));
+ }
+ }
+ else {
+ if (copyout(&future_chunk_timestamp, buffer, sizeof(uint64_t))) {
+ return 0;
+ }
+ }
+ }
+
+ return (buffer + sizeof(uint64_t));
+}
+
+int
+kdbg_write_v3_header(user_addr_t user_header, size_t *user_header_size, int fd)
+{
+ int ret = KERN_SUCCESS;
+ kd_header_v3 header;
+
+ uint8_t* cpumap = 0;
+ uint32_t cpumap_size = 0;
+ uint32_t thrmap_size = 0;
+
+ size_t bytes_needed = 0;
+
+ // Check that only one of them is valid
+ assert(!user_header ^ !fd);
+ assert(user_header_size);
+
+ if ( !(kd_ctrl_page.kdebug_flags & KDBG_BUFINIT) ) {
+ ret = EINVAL;
+ goto bail;
+ }
+
+ if ( !(user_header || fd) ) {
+ ret = EINVAL;
+ goto bail;
+ }
+
+ // Initialize the cpu map
+ ret = kdbg_cpumap_init_internal(kd_ctrl_page.kdebug_iops, kd_ctrl_page.kdebug_cpus, &cpumap, &cpumap_size);
+ if (ret != KERN_SUCCESS) {
+ goto bail;
+ }
+
+ // Check if a thread map is initialized
+ if ( !kd_mapptr ) {
+ ret = EINVAL;
+ goto bail;
+ }
+ thrmap_size = kd_mapcount * sizeof(kd_threadmap);
+
+ // Setup the header.
+ // See v3 header description in sys/kdebug.h for more inforamtion.
+
+ header.tag = RAW_VERSION3;
+ header.sub_tag = V3_HEADER_VERSION;
+ header.length = ( sizeof(kd_header_v3) + cpumap_size - sizeof(kd_cpumap_header));
+
+ mach_timebase_info_data_t timebase = {0, 0};
+ clock_timebase_info(&timebase);
+ header.timebase_numer = timebase.numer;
+ header.timebase_denom = timebase.denom;
+ header.timestamp = 0;
+ header.walltime_secs = 0;
+ header.walltime_usecs = 0;
+ header.timezone_minuteswest = 0;
+ header.timezone_dst = 0;
+
+#if defined __LP64__
+ header.flags = 1;
+#else
+ header.flags = 0;
+#endif
+
+ // If its a buffer, check if we have enough space to copy the header and the maps.
+ if (user_header) {
+ bytes_needed = header.length + thrmap_size + (2 * sizeof(kd_chunk_header_v3));
+ if ( !user_header_size ) {
+ ret = EINVAL;
+ goto bail;
+ }
+ if (*user_header_size < bytes_needed) {
+ ret = EINVAL;
+ goto bail;
+ }
+ }
+
+ // Start writing the header
+ if (fd) {
+ void *hdr_ptr = (void *)(((uintptr_t) &header) + sizeof(kd_chunk_header_v3));
+ size_t payload_size = (sizeof(kd_header_v3) - sizeof(kd_chunk_header_v3));
+
+ ret = kdbg_write_v3_chunk_to_fd(RAW_VERSION3, V3_HEADER_VERSION, header.length, hdr_ptr, payload_size, fd);
+ if (ret) {
+ goto bail;
+ }
+ }
+ else {
+ if (copyout(&header, user_header, sizeof(kd_header_v3))) {
+ ret = EFAULT;
+ goto bail;
+ }
+ // Update the user pointer
+ user_header += sizeof(kd_header_v3);
+ }
+
+ // Write a cpu map. This is a sub chunk of the header
+ cpumap = (uint8_t*)((uintptr_t) cpumap + sizeof(kd_cpumap_header));
+ size_t payload_size = (size_t)(cpumap_size - sizeof(kd_cpumap_header));
+ if (fd) {
+ ret = kdbg_write_v3_chunk_to_fd(V3_CPU_MAP, V3_CPUMAP_VERSION, payload_size, (void *)cpumap, payload_size, fd);
+ if (ret) {
+ goto bail;
+ }
+ }
+ else {
+ ret = kdbg_write_v3_chunk_header(user_header, V3_CPU_MAP, V3_CPUMAP_VERSION, payload_size, NULL, NULL);
+ if (ret) {
+ goto bail;
+ }
+ user_header += sizeof(kd_chunk_header_v3);
+ if (copyout(cpumap, user_header, payload_size)) {
+ ret = EFAULT;
+ goto bail;
+ }
+ // Update the user pointer
+ user_header += payload_size;
+ }
+
+ // Write a thread map
+ if (fd) {
+ ret = kdbg_write_v3_chunk_to_fd(V3_THREAD_MAP, V3_THRMAP_VERSION, thrmap_size, (void *)kd_mapptr, thrmap_size, fd);
+ if (ret) {
+ goto bail;
+ }
+ }
+ else {
+ ret = kdbg_write_v3_chunk_header(user_header, V3_THREAD_MAP, V3_THRMAP_VERSION, thrmap_size, NULL, NULL);
+ if (ret) {
+ goto bail;
+ }
+ user_header += sizeof(kd_chunk_header_v3);
+ if (copyout(kd_mapptr, user_header, thrmap_size)) {
+ ret = EFAULT;
+ goto bail;
+ }
+ user_header += thrmap_size;
+ }
+
+ if (fd) {
+ RAW_file_written += bytes_needed;
+ }
+
+ *user_header_size = bytes_needed;
+bail:
+ if (cpumap) {
+ kmem_free(kernel_map, (vm_offset_t)cpumap, cpumap_size);
+ }
+ return (ret);
}
+int
+kdbg_readcpumap(user_addr_t user_cpumap, size_t *user_cpumap_size)
+{
+ uint8_t* cpumap = NULL;
+ uint32_t cpumap_size = 0;
+ int ret = KERN_SUCCESS;
+
+ if (kd_ctrl_page.kdebug_flags & KDBG_BUFINIT) {
+ if (kdbg_cpumap_init_internal(kd_ctrl_page.kdebug_iops, kd_ctrl_page.kdebug_cpus, &cpumap, &cpumap_size) == KERN_SUCCESS) {
+ if (user_cpumap) {
+ size_t bytes_to_copy = (*user_cpumap_size >= cpumap_size) ? cpumap_size : *user_cpumap_size;
+ if (copyout(cpumap, user_cpumap, (size_t)bytes_to_copy)) {
+ ret = EFAULT;
+ }
+ }
+ *user_cpumap_size = cpumap_size;
+ kmem_free(kernel_map, (vm_offset_t)cpumap, cpumap_size);
+ } else
+ ret = EINVAL;
+ } else
+ ret = EINVAL;
+
+ return (ret);
+}
int
-kdbg_readmap(user_addr_t buffer, size_t *number, vnode_t vp, vfs_context_t ctx)
+kdbg_readcurthrmap(user_addr_t buffer, size_t *bufsize)
{
- int avail = *number;
+ kd_threadmap *mapptr;
+ unsigned int mapsize;
+ unsigned int mapcount;
+ unsigned int count = 0;
int ret = 0;
- uint32_t count = 0;
- count = avail/sizeof (kd_threadmap);
+ count = *bufsize/sizeof(kd_threadmap);
+ *bufsize = 0;
- if (count && (count <= kd_mapcount))
- {
- if ((kd_ctrl_page.kdebug_flags & KDBG_MAPINIT) && kd_mapsize && kd_mapptr)
- {
- if (*number < kd_mapsize)
- ret = EINVAL;
- else
- {
- if (vp)
- {
- RAW_header header;
- clock_sec_t secs;
- clock_usec_t usecs;
- char *pad_buf;
- int pad_size;
-
- header.version_no = RAW_VERSION1;
- header.thread_count = count;
-
- clock_get_calendar_microtime(&secs, &usecs);
- header.TOD_secs = secs;
- header.TOD_usecs = usecs;
-
- ret = vn_rdwr(UIO_WRITE, vp, (caddr_t)&header, sizeof(RAW_header), RAW_file_offset,
- UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, vfs_context_ucred(ctx), (int *) 0, vfs_context_proc(ctx));
- if (ret)
- goto write_error;
- RAW_file_offset += sizeof(RAW_header);
+ if ( (mapptr = kdbg_thrmap_init_internal(count, &mapsize, &mapcount)) ) {
+ if (copyout(mapptr, buffer, mapcount * sizeof(kd_threadmap)))
+ ret = EFAULT;
+ else
+ *bufsize = (mapcount * sizeof(kd_threadmap));
- ret = vn_rdwr(UIO_WRITE, vp, (caddr_t)kd_mapptr, kd_mapsize, RAW_file_offset,
- UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, vfs_context_ucred(ctx), (int *) 0, vfs_context_proc(ctx));
- if (ret)
- goto write_error;
- RAW_file_offset += kd_mapsize;
+ kmem_free(kernel_map, (vm_offset_t)mapptr, mapsize);
+ } else
+ ret = EINVAL;
- pad_size = PAGE_SIZE - (RAW_file_offset & PAGE_MASK_64);
+ return (ret);
+}
- if (pad_size)
- {
- pad_buf = (char *)kalloc(pad_size);
- memset(pad_buf, 0, pad_size);
+static int
+kdbg_write_v1_plus_header(uint32_t count, vnode_t vp, vfs_context_t ctx)
+{
+ int ret = 0;
+ RAW_header header;
+ clock_sec_t secs;
+ clock_usec_t usecs;
+ char *pad_buf;
+ uint32_t pad_size;
+ uint32_t extra_thread_count = 0;
+ uint32_t cpumap_size;
+ unsigned int mapsize = kd_mapcount * sizeof(kd_threadmap);
- ret = vn_rdwr(UIO_WRITE, vp, (caddr_t)pad_buf, pad_size, RAW_file_offset,
- UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, vfs_context_ucred(ctx), (int *) 0, vfs_context_proc(ctx));
- kfree(pad_buf, pad_size);
-
- if (ret)
- goto write_error;
- RAW_file_offset += pad_size;
- }
- RAW_file_written += sizeof(RAW_header) + kd_mapsize + pad_size;
+ /*
+ * To write a RAW_VERSION1+ file, we
+ * must embed a cpumap in the "padding"
+ * used to page align the events following
+ * the threadmap. If the threadmap happens
+ * to not require enough padding, we
+ * artificially increase its footprint
+ * until it needs enough padding.
+ */
- } else {
- if (copyout(kd_mapptr, buffer, kd_mapsize))
+ assert(vp);
+ assert(ctx);
+
+ pad_size = PAGE_16KB - ((sizeof(RAW_header) + (count * sizeof(kd_threadmap))) & PAGE_MASK_64);
+ cpumap_size = sizeof(kd_cpumap_header) + kd_ctrl_page.kdebug_cpus * sizeof(kd_cpumap);
+
+ if (cpumap_size > pad_size) {
+ /* If the cpu map doesn't fit in the current available pad_size,
+ * we increase the pad_size by 16K. We do this so that the event
+ * data is always available on a page aligned boundary for both
+ * 4k and 16k systems. We enforce this alignment for the event
+ * data so that we can take advantage of optimized file/disk writes.*/
+ pad_size += PAGE_16KB;
+ }
+
+ /* The way we are silently embedding a cpumap in the "padding" is by artificially
+ * increasing the number of thread entries. However, we'll also need to ensure that
+ * the cpumap is embedded in the last 4K page before when the event data is expected.
+ * This way the tools can read the data starting the next page boundary on both
+ * 4K and 16K systems preserving compatibility with older versions of the tools
+ */
+ if (pad_size > PAGE_4KB) {
+ pad_size -= PAGE_4KB;
+ extra_thread_count = (pad_size / sizeof(kd_threadmap)) + 1;
+ }
+
+ header.version_no = RAW_VERSION1;
+ header.thread_count = count + extra_thread_count;
+
+ clock_get_calendar_microtime(&secs, &usecs);
+ header.TOD_secs = secs;
+ header.TOD_usecs = usecs;
+
+ ret = vn_rdwr(UIO_WRITE, vp, (caddr_t)&header, sizeof(RAW_header), RAW_file_offset,
+ UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, vfs_context_ucred(ctx), (int *) 0, vfs_context_proc(ctx));
+ if (ret)
+ goto write_error;
+ RAW_file_offset += sizeof(RAW_header);
+
+ ret = vn_rdwr(UIO_WRITE, vp, (caddr_t)kd_mapptr, mapsize, RAW_file_offset,
+ UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, vfs_context_ucred(ctx), (int *) 0, vfs_context_proc(ctx));
+ if (ret)
+ goto write_error;
+ RAW_file_offset += mapsize;
+
+ if (extra_thread_count) {
+ pad_size = extra_thread_count * sizeof(kd_threadmap);
+ pad_buf = (char *)kalloc(pad_size);
+ if (!pad_buf) {
+ ret = ENOMEM;
+ goto write_error;
+ }
+ memset(pad_buf, 0, pad_size);
+
+ ret = vn_rdwr(UIO_WRITE, vp, (caddr_t)pad_buf, pad_size, RAW_file_offset,
+ UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, vfs_context_ucred(ctx), (int *) 0, vfs_context_proc(ctx));
+ kfree(pad_buf, pad_size);
+
+ if (ret)
+ goto write_error;
+ RAW_file_offset += pad_size;
+
+ }
+
+ pad_size = PAGE_SIZE - (RAW_file_offset & PAGE_MASK_64);
+ if (pad_size) {
+ pad_buf = (char *)kalloc(pad_size);
+ if (!pad_buf) {
+ ret = ENOMEM;
+ goto write_error;
+ }
+ memset(pad_buf, 0, pad_size);
+
+ /*
+ * embed a cpumap in the padding bytes.
+ * older code will skip this.
+ * newer code will know how to read it.
+ */
+ uint32_t temp = pad_size;
+ if (kdbg_cpumap_init_internal(kd_ctrl_page.kdebug_iops, kd_ctrl_page.kdebug_cpus, (uint8_t**)&pad_buf, &temp) != KERN_SUCCESS) {
+ memset(pad_buf, 0, pad_size);
+ }
+
+ ret = vn_rdwr(UIO_WRITE, vp, (caddr_t)pad_buf, pad_size, RAW_file_offset,
+ UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, vfs_context_ucred(ctx), (int *) 0, vfs_context_proc(ctx));
+ kfree(pad_buf, pad_size);
+
+ if (ret)
+ goto write_error;
+ RAW_file_offset += pad_size;
+ }
+ RAW_file_written += sizeof(RAW_header) + mapsize + pad_size;
+
+write_error:
+ return ret;
+}
+
+int
+kdbg_readthrmap(user_addr_t buffer, size_t *number, vnode_t vp, vfs_context_t ctx)
+{
+
+ int avail = 0;
+ int ret = 0;
+ uint32_t count = 0;
+ unsigned int mapsize;
+
+ if ((!vp && !buffer) || (vp && buffer)) {
+ return EINVAL;
+ }
+
+ assert(number);
+ assert((vp == NULL) || (ctx != NULL));
+
+ avail = *number;
+ count = avail/sizeof (kd_threadmap);
+ mapsize = kd_mapcount * sizeof(kd_threadmap);
+
+ if (count && (count <= kd_mapcount)) {
+ if ((kd_ctrl_page.kdebug_flags & KDBG_MAPINIT) && kd_mapsize && kd_mapptr) {
+ if (*number < mapsize)
+ ret = EINVAL;
+ else {
+ if (vp) {
+ ret = kdbg_write_v1_plus_header(count, vp, ctx);
+ if (ret)
+ goto write_error;
+ }
+ else {
+ if (copyout(kd_mapptr, buffer, mapsize))
ret = EINVAL;
}
}
{
count = 0;
- vn_rdwr(UIO_WRITE, vp, (caddr_t)&count, sizeof(uint32_t), RAW_file_offset,
- UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, vfs_context_ucred(ctx), (int *) 0, vfs_context_proc(ctx));
- RAW_file_offset += sizeof(uint32_t);
- RAW_file_written += sizeof(uint32_t);
+ ret = kdbg_write_to_vnode((caddr_t)&count, sizeof(uint32_t), vp, ctx, RAW_file_offset);
+ if (!ret) {
+ RAW_file_offset += sizeof(uint32_t);
+ RAW_file_written += sizeof(uint32_t);
+ }
}
write_error:
if ((kd_ctrl_page.kdebug_flags & KDBG_MAPINIT) && kd_mapsize && kd_mapptr)
}
int
-kdbg_getentropy (user_addr_t buffer, size_t *number, int ms_timeout)
+kdbg_readthrmap_v3(user_addr_t buffer, size_t *number, int fd)
{
- int avail = *number;
+ int avail = 0;
int ret = 0;
- int s;
- u_int64_t abstime;
- u_int64_t ns;
- int wait_result = THREAD_AWAKENED;
-
-
- if (kd_entropy_buffer)
- return(EBUSY);
-
- if (ms_timeout < 0)
- return(EINVAL);
-
- kd_entropy_count = avail/sizeof(uint64_t);
-
- if (kd_entropy_count > MAX_ENTROPY_COUNT || kd_entropy_count == 0) {
- /*
- * Enforce maximum entropy entries
- */
- return(EINVAL);
- }
- kd_entropy_bufsize = kd_entropy_count * sizeof(uint64_t);
-
- /*
- * allocate entropy buffer
- */
- if (kmem_alloc(kernel_map, &kd_entropy_buftomem, (vm_size_t)kd_entropy_bufsize) == KERN_SUCCESS) {
- kd_entropy_buffer = (uint64_t *) kd_entropy_buftomem;
- } else {
- kd_entropy_buffer = (uint64_t *) 0;
- kd_entropy_count = 0;
-
- return (ENOMEM);
- }
- kd_entropy_indx = 0;
-
- KERNEL_DEBUG_CONSTANT(0xbbbbf000 | DBG_FUNC_START, ms_timeout, kd_entropy_count, 0, 0, 0);
-
- /*
- * Enable entropy sampling
- */
- kdbg_set_flags(SLOW_ENTROPY, KDEBUG_ENABLE_ENTROPY, TRUE);
-
- if (ms_timeout) {
- ns = (u_int64_t)ms_timeout * (u_int64_t)(1000 * 1000);
- nanoseconds_to_absolutetime(ns, &abstime );
- clock_absolutetime_interval_to_deadline( abstime, &abstime );
- } else
- abstime = 0;
-
- s = ml_set_interrupts_enabled(FALSE);
- lck_spin_lock(kdw_spin_lock);
-
- while (wait_result == THREAD_AWAKENED && kd_entropy_indx < kd_entropy_count) {
-
- kde_waiter = 1;
+ uint32_t count = 0;
+ unsigned int mapsize;
- if (abstime) {
- /*
- * wait for the specified timeout or
- * until we've hit our sample limit
- */
- wait_result = lck_spin_sleep_deadline(kdw_spin_lock, 0, &kde_waiter, THREAD_ABORTSAFE, abstime);
- } else {
- /*
- * wait until we've hit our sample limit
- */
- wait_result = lck_spin_sleep(kdw_spin_lock, 0, &kde_waiter, THREAD_ABORTSAFE);
- }
- kde_waiter = 0;
+ if ((!fd && !buffer) || (fd && buffer)) {
+ return EINVAL;
}
- lck_spin_unlock(kdw_spin_lock);
- ml_set_interrupts_enabled(s);
- /*
- * Disable entropy sampling
- */
- kdbg_set_flags(SLOW_ENTROPY, KDEBUG_ENABLE_ENTROPY, FALSE);
+ assert(number);
- KERNEL_DEBUG_CONSTANT(0xbbbbf000 | DBG_FUNC_END, ms_timeout, kd_entropy_indx, 0, 0, 0);
-
- *number = 0;
- ret = 0;
+ avail = *number;
+ count = avail/sizeof (kd_threadmap);
+ mapsize = kd_mapcount * sizeof(kd_threadmap);
- if (kd_entropy_indx > 0) {
- /*
- * copyout the buffer
- */
- if (copyout(kd_entropy_buffer, buffer, kd_entropy_indx * sizeof(uint64_t)))
+ if (count && (count <= kd_mapcount)) {
+ if ((kd_ctrl_page.kdebug_flags & KDBG_MAPINIT) && kd_mapsize && kd_mapptr) {
+ if (*number < mapsize) {
+ ret = EINVAL;
+ }
+ else {
+ ret = kdbg_write_v3_header(buffer, number, fd);
+ if (ret) {
+ goto write_error;
+ }
+ }
+ }
+ else {
ret = EINVAL;
- else
- *number = kd_entropy_indx * sizeof(uint64_t);
+ }
}
- /*
- * Always cleanup
- */
- kd_entropy_count = 0;
- kd_entropy_indx = 0;
- kd_entropy_buftomem = 0;
- kmem_free(kernel_map, (vm_offset_t)kd_entropy_buffer, kd_entropy_bufsize);
- kd_entropy_buffer = (uint64_t *) 0;
-
+ else {
+ ret = EINVAL;
+ }
+write_error:
+ if ((kd_ctrl_page.kdebug_flags & KDBG_MAPINIT) && kd_mapsize && kd_mapptr) {
+ kmem_free(kernel_map, (vm_offset_t)kd_mapptr, kd_mapsize);
+ kd_ctrl_page.kdebug_flags &= ~KDBG_MAPINIT;
+ kd_mapsize = 0;
+ kd_mapptr = (kd_threadmap *) 0;
+ kd_mapcount = 0;
+ }
return(ret);
}
}
-static void
+static int
kdbg_enable_bg_trace(void)
{
+ int ret = 0;
+
if (kdlog_bg_trace == TRUE && kdlog_bg_trace_running == FALSE && n_storage_buffers == 0) {
nkdbufs = bg_nkdbufs;
- kdbg_reinit(FALSE);
- kdbg_set_tracing_enabled(TRUE, KDEBUG_ENABLE_TRACE);
- kdlog_bg_trace_running = TRUE;
+ ret = kdbg_reinit(FALSE);
+ if (0 == ret) {
+ kdbg_set_tracing_enabled(TRUE, KDEBUG_ENABLE_TRACE);
+ kdlog_bg_trace_running = TRUE;
+ }
+ wakeup(&kdlog_bg_trace);
}
+ return ret;
}
static void
proc_t p, curproc;
if (name[0] == KERN_KDGETENTROPY ||
- name[0] == KERN_KDWRITETR ||
- name[0] == KERN_KDWRITEMAP ||
+ name[0] == KERN_KDWRITETR ||
+ name[0] == KERN_KDWRITETR_V3 ||
+ name[0] == KERN_KDWRITEMAP ||
+ name[0] == KERN_KDWRITEMAP_V3 ||
name[0] == KERN_KDEFLAGS ||
name[0] == KERN_KDDFLAGS ||
name[0] == KERN_KDENABLE ||
- name[0] == KERN_KDENABLE_BG_TRACE ||
+ name[0] == KERN_KDENABLE_BG_TRACE ||
name[0] == KERN_KDSETBUF) {
if ( namelen < 2 )
kdbg_lock_init();
if ( !(kd_ctrl_page.kdebug_flags & KDBG_LOCKINIT))
- return(ENOSPC);
+ return(ENOSPC);
lck_mtx_lock(kd_trace_mtx_sysctl);
switch(name[0]) {
-
- case KERN_KDGETBUF:
- /*
- * Does not alter the global_state_pid
- * This is a passive request.
- */
- if (size < sizeof(kd_bufinfo.nkdbufs)) {
- /*
- * There is not enough room to return even
- * the first element of the info structure.
+ case KERN_KDGETBUF:
+ /*
+ * Does not alter the global_state_pid
+ * This is a passive request.
*/
- ret = EINVAL;
+ if (size < sizeof(kd_bufinfo.nkdbufs)) {
+ /*
+ * There is not enough room to return even
+ * the first element of the info structure.
+ */
+ ret = EINVAL;
+ goto out;
+ }
+ kd_bufinfo.nkdbufs = nkdbufs;
+ kd_bufinfo.nkdthreads = kd_mapcount;
+
+ if ( (kd_ctrl_page.kdebug_slowcheck & SLOW_NOLOG) )
+ kd_bufinfo.nolog = 1;
+ else
+ kd_bufinfo.nolog = 0;
+
+ kd_bufinfo.flags = kd_ctrl_page.kdebug_flags;
+#if defined(__LP64__)
+ kd_bufinfo.flags |= KDBG_LP64;
+#endif
+ kd_bufinfo.bufid = global_state_pid;
+
+ if (size >= sizeof(kd_bufinfo)) {
+ /*
+ * Provide all the info we have
+ */
+ if (copyout(&kd_bufinfo, where, sizeof(kd_bufinfo)))
+ ret = EINVAL;
+ } else {
+ /*
+ * For backwards compatibility, only provide
+ * as much info as there is room for.
+ */
+ if (copyout(&kd_bufinfo, where, size))
+ ret = EINVAL;
+ }
+ goto out;
+ case KERN_KDGETENTROPY: {
+ /* Obsolescent - just fake with a random buffer */
+ char *buffer = (char *) kalloc(size);
+ read_frandom((void *) buffer, size);
+ ret = copyout(buffer, where, size);
+ kfree(buffer, size);
goto out;
}
- kd_bufinfo.nkdbufs = nkdbufs;
- kd_bufinfo.nkdthreads = kd_mapsize / sizeof(kd_threadmap);
-
- if ( (kd_ctrl_page.kdebug_slowcheck & SLOW_NOLOG) )
- kd_bufinfo.nolog = 1;
- else
- kd_bufinfo.nolog = 0;
+
+ case KERN_KDENABLE_BG_TRACE:
+ bg_nkdbufs = kdbg_set_nkdbufs(value);
+ kdlog_bg_trace = TRUE;
+ ret = kdbg_enable_bg_trace();
+ goto out;
+
+ case KERN_KDDISABLE_BG_TRACE:
+ kdlog_bg_trace = FALSE;
+ kdbg_disable_bg_trace();
+ goto out;
- kd_bufinfo.flags = kd_ctrl_page.kdebug_flags;
-#if defined(__LP64__)
- kd_bufinfo.flags |= KDBG_LP64;
-#endif
- kd_bufinfo.bufid = global_state_pid;
-
- if (size >= sizeof(kd_bufinfo)) {
- /*
- * Provide all the info we have
- */
- if (copyout(&kd_bufinfo, where, sizeof(kd_bufinfo)))
+ case KERN_KDWAIT_BG_TRACE_RESET:
+ if (!kdlog_bg_trace){
ret = EINVAL;
- } else {
- /*
- * For backwards compatibility, only provide
- * as much info as there is room for.
- */
- if (copyout(&kd_bufinfo, where, size))
+ goto out;
+ }
+ wait_result_t wait_result = assert_wait(&kdlog_bg_trace, THREAD_ABORTSAFE);
+ lck_mtx_unlock(kd_trace_mtx_sysctl);
+ if (wait_result == THREAD_WAITING)
+ wait_result = thread_block(THREAD_CONTINUE_NULL);
+ if (wait_result == THREAD_INTERRUPTED)
+ ret = EINTR;
+ lck_mtx_lock(kd_trace_mtx_sysctl);
+ goto out;
+
+ case KERN_KDSET_BG_TYPEFILTER:
+ if (!kdlog_bg_trace || !kdlog_bg_trace_running){
ret = EINVAL;
- }
- goto out;
- break;
+ goto out;
+ }
- case KERN_KDGETENTROPY:
- if (kd_entropy_buffer)
- ret = EBUSY;
- else
- ret = kdbg_getentropy(where, sizep, value);
- goto out;
- break;
+ if (size != KDBG_TYPEFILTER_BITMAP_SIZE) {
+ ret = EINVAL;
+ goto out;
+ }
- case KERN_KDENABLE_BG_TRACE:
- bg_nkdbufs = kdbg_set_nkdbufs(value);
- kdlog_bg_trace = TRUE;
- kdbg_enable_bg_trace();
- goto out;
- break;
+ if ((kd_ctrl_page.kdebug_flags & KDBG_TYPEFILTER_CHECK) == 0){
+ if ((ret = kdbg_enable_typefilter()))
+ goto out;
+ }
- case KERN_KDDISABLE_BG_TRACE:
- kdlog_bg_trace = FALSE;
- kdbg_disable_bg_trace();
- goto out;
- break;
+ if (copyin(where, type_filter_bitmap, KDBG_TYPEFILTER_BITMAP_SIZE)) {
+ ret = EINVAL;
+ goto out;
+ }
+ kdbg_iop_list_callback(kd_ctrl_page.kdebug_iops, KD_CALLBACK_TYPEFILTER_CHANGED, type_filter_bitmap);
+ goto out;
}
if ((curproc = current_proc()) != NULL)
ret = ESRCH;
goto out;
}
- if (global_state_pid == -1)
+ if (global_state_pid == -1)
global_state_pid = curpid;
else if (global_state_pid != curpid) {
if ((p = proc_find(global_state_pid)) == NULL) {
ret = EINVAL;
break;
}
- kdbg_mapinit();
+ kdbg_thrmap_init();
kdbg_set_tracing_enabled(TRUE, value);
}
break;
case KERN_KDREMOVE:
kdbg_clear();
- kdbg_enable_bg_trace();
+ ret = kdbg_enable_bg_trace();
break;
case KERN_KDSETREG:
if(size < sizeof(kd_regtype)) {
ret = kdbg_setreg(&kd_Reg);
break;
case KERN_KDGETREG:
- if (size < sizeof(kd_regtype)) {
- ret = EINVAL;
- break;
- }
- ret = kdbg_getreg(&kd_Reg);
- if (copyout(&kd_Reg, where, sizeof(kd_regtype))) {
- ret = EINVAL;
- }
kdbg_disable_bg_trace();
-
+ ret = EINVAL;
break;
case KERN_KDREADTR:
- ret = kdbg_read(where, sizep, NULL, NULL);
+ ret = kdbg_read(where, sizep, NULL, NULL, RAW_VERSION1);
break;
- case KERN_KDWRITETR:
- case KERN_KDWRITEMAP:
+ case KERN_KDWRITETR:
+ case KERN_KDWRITETR_V3:
+ case KERN_KDWRITEMAP:
+ case KERN_KDWRITEMAP_V3:
{
struct vfs_context context;
struct fileproc *fp;
vnode_t vp;
int fd;
- kdbg_disable_bg_trace();
-
- if (name[0] == KERN_KDWRITETR) {
+ if (name[0] == KERN_KDWRITETR || name[0] == KERN_KDWRITETR_V3) {
int s;
int wait_result = THREAD_AWAKENED;
u_int64_t abstime;
context.vc_thread = current_thread();
context.vc_ucred = fp->f_fglob->fg_cred;
- if (fp->f_fglob->fg_type != DTYPE_VNODE) {
+ if (FILEGLOB_DTYPE(fp->f_fglob) != DTYPE_VNODE) {
fp_drop(p, fd, fp, 1);
proc_fdunlock(p);
proc_fdunlock(p);
if ((ret = vnode_getwithref(vp)) == 0) {
-
- if (name[0] == KERN_KDWRITETR) {
+ RAW_file_offset = fp->f_fglob->fg_offset;
+ if (name[0] == KERN_KDWRITETR || name[0] == KERN_KDWRITETR_V3) {
number = nkdbufs * sizeof(kd_buf);
- KERNEL_DEBUG_CONSTANT((TRACEDBG_CODE(DBG_TRACE_INFO, 3)) | DBG_FUNC_START, 0, 0, 0, 0, 0);
- ret = kdbg_read(0, &number, vp, &context);
- KERNEL_DEBUG_CONSTANT((TRACEDBG_CODE(DBG_TRACE_INFO, 3)) | DBG_FUNC_END, number, 0, 0, 0, 0);
+ KERNEL_DEBUG_CONSTANT(TRACE_WRITING_EVENTS | DBG_FUNC_START, 0, 0, 0, 0, 0);
+ if (name[0] == KERN_KDWRITETR_V3)
+ ret = kdbg_read(0, &number, vp, &context, RAW_VERSION3);
+ else
+ ret = kdbg_read(0, &number, vp, &context, RAW_VERSION1);
+ KERNEL_DEBUG_CONSTANT(TRACE_WRITING_EVENTS | DBG_FUNC_END, number, 0, 0, 0, 0);
*sizep = number;
} else {
- number = kd_mapsize;
- kdbg_readmap(0, &number, vp, &context);
+ number = kd_mapcount * sizeof(kd_threadmap);
+ if (name[0] == KERN_KDWRITEMAP_V3)
+ kdbg_readthrmap_v3(0, &number, fd);
+ else
+ kdbg_readthrmap(0, &number, vp, &context);
}
+ fp->f_fglob->fg_offset = RAW_file_offset;
vnode_put(vp);
}
fp_drop(p, fd, fp, 0);
break;
}
+ case KERN_KDBUFWAIT:
+ {
+ /* WRITETR lite -- just block until there's data */
+ int s;
+ int wait_result = THREAD_AWAKENED;
+ u_int64_t abstime;
+ u_int64_t ns;
+ size_t number = 0;
+
+ kdbg_disable_bg_trace();
+
+
+ if (*sizep) {
+ ns = ((u_int64_t)*sizep) * (u_int64_t)(1000 * 1000);
+ nanoseconds_to_absolutetime(ns, &abstime );
+ clock_absolutetime_interval_to_deadline( abstime, &abstime );
+ } else
+ abstime = 0;
+
+ s = ml_set_interrupts_enabled(FALSE);
+ if( !s )
+ panic("trying to wait with interrupts off");
+ lck_spin_lock(kdw_spin_lock);
+
+ /* drop the mutex so don't exclude others from
+ * accessing trace
+ */
+ lck_mtx_unlock(kd_trace_mtx_sysctl);
+
+ while (wait_result == THREAD_AWAKENED &&
+ kd_ctrl_page.kds_inuse_count < n_storage_threshold) {
+
+ kds_waiter = 1;
+
+ if (abstime)
+ wait_result = lck_spin_sleep_deadline(kdw_spin_lock, 0, &kds_waiter, THREAD_ABORTSAFE, abstime);
+ else
+ wait_result = lck_spin_sleep(kdw_spin_lock, 0, &kds_waiter, THREAD_ABORTSAFE);
+
+ kds_waiter = 0;
+ }
+
+ /* check the count under the spinlock */
+ number = (kd_ctrl_page.kds_inuse_count >= n_storage_threshold);
+
+ lck_spin_unlock(kdw_spin_lock);
+ ml_set_interrupts_enabled(s);
+
+ /* pick the mutex back up again */
+ lck_mtx_lock(kd_trace_mtx_sysctl);
+
+ /* write out whether we've exceeded the threshold */
+ *sizep = number;
+ break;
+ }
case KERN_KDPIDTR:
if (size < sizeof(kd_regtype)) {
ret = EINVAL;
ret = kdbg_setpidex(&kd_Reg);
break;
- case KERN_KDTHRMAP:
- ret = kdbg_readmap(where, sizep, NULL, NULL);
- break;
- case KERN_KDSETRTCDEC:
+ case KERN_KDCPUMAP:
+ ret = kdbg_readcpumap(where, sizep);
+ break;
+ case KERN_KDTHRMAP:
+ ret = kdbg_readthrmap(where, sizep, NULL, NULL);
+ break;
+ case KERN_KDREADCURTHRMAP:
+ ret = kdbg_readcurthrmap(where, sizep);
+ break;
+ case KERN_KDSETRTCDEC:
if (size < sizeof(kd_regtype)) {
ret = EINVAL;
break;
case KERN_KDSET_TYPEFILTER:
kdbg_disable_bg_trace();
- if ((kd_ctrl_page.kdebug_flags & KDBG_TYPEFILTER_CHECK) == 0){
- if ((ret = kdbg_enable_typefilter()))
- break;
- }
-
if (size != KDBG_TYPEFILTER_BITMAP_SIZE) {
ret = EINVAL;
break;
}
+ if ((kd_ctrl_page.kdebug_flags & KDBG_TYPEFILTER_CHECK) == 0){
+ if ((ret = kdbg_enable_typefilter()))
+ break;
+ }
+
if (copyin(where, type_filter_bitmap, KDBG_TYPEFILTER_BITMAP_SIZE)) {
ret = EINVAL;
break;
}
+ kdbg_iop_list_callback(kd_ctrl_page.kdebug_iops, KD_CALLBACK_TYPEFILTER_CHANGED, type_filter_bitmap);
break;
default:
ret = EINVAL;
* move through the lists w/o use of any locks
*/
int
-kdbg_read(user_addr_t buffer, size_t *number, vnode_t vp, vfs_context_t ctx)
+kdbg_read(user_addr_t buffer, size_t *number, vnode_t vp, vfs_context_t ctx, uint32_t file_version)
{
unsigned int count;
unsigned int cpu, min_cpu;
- uint64_t mintime, t;
+ uint64_t mintime, t, barrier = 0;
int error = 0;
kd_buf *tempbuf;
uint32_t rcursor;
boolean_t lostevents = FALSE;
boolean_t out_of_events = FALSE;
+ assert(number);
count = *number/sizeof(kd_buf);
*number = 0;
return EINVAL;
memset(&lostevent, 0, sizeof(lostevent));
- lostevent.debugid = TRACEDBG_CODE(DBG_TRACE_INFO, 2);
+ lostevent.debugid = TRACE_LOST_EVENTS;
+
+ /* Capture timestamp. Only sort events that have occured before the timestamp.
+ * Since the iop is being flushed here, its possible that events occur on the AP
+ * while running live tracing. If we are disabled, no new events should
+ * occur on the AP.
+ */
+
+ if (kd_ctrl_page.enabled)
+ {
+ // timestamp is non-zero value
+ barrier = mach_absolute_time() & KDBG_TIMESTAMP_MASK;
+ }
+
+ // Request each IOP to provide us with up to date entries before merging buffers together.
+ kdbg_iop_list_callback(kd_ctrl_page.kdebug_iops, KD_CALLBACK_SYNC_FLUSH, NULL);
/*
* because we hold kd_trace_mtx_sysctl, no other control threads can
tempbuf_count = KDCOPYBUF_COUNT;
while (count) {
- tempbuf = kdcopybuf;
+ tempbuf = kdcopybuf;
tempbuf_number = 0;
// While space
- while (tempbuf_count) {
+ while (tempbuf_count) {
mintime = 0xffffffffffffffffULL;
min_kdbp = NULL;
min_cpu = 0;
// Check all CPUs
- for (cpu = 0, kdbp = &kdbip[0]; cpu < kd_cpus; cpu++, kdbp++) {
+ for (cpu = 0, kdbp = &kdbip[0]; cpu < kd_ctrl_page.kdebug_cpus; cpu++, kdbp++) {
// Find one with raw data
if ((kdsp = kdbp->kd_list_head).raw == KDS_PTR_NULL)
continue;
+ /* Debugging aid: maintain a copy of the "kdsp"
+ * index.
+ */
+ volatile union kds_ptr kdsp_shadow;
+
+ kdsp_shadow = kdsp;
// Get from cpu data to buffer header to buffer
kdsp_actual = POINTER_FROM_KDS_PTR(kdsp);
+ volatile struct kd_storage *kdsp_actual_shadow;
+
+ kdsp_actual_shadow = kdsp_actual;
+
// See if there are actual data left in this buffer
rcursor = kdsp_actual->kds_readlast;
t = kdbg_get_timestamp(&kdsp_actual->kds_records[rcursor]);
+ if ((t > barrier) && (barrier > 0)) {
+ /*
+ * Need to wait to flush iop again before we
+ * sort any more data from the buffers
+ */
+ out_of_events = TRUE;
+ break;
+ }
if (t < kdsp_actual->kds_timestamp) {
/*
* indicates we've not yet completed filling
break;
}
if (tempbuf_number) {
+ if (file_version == RAW_VERSION3) {
+ if ( !(kdbg_write_v3_event_chunk_header(buffer, V3_RAW_EVENTS, (tempbuf_number * sizeof(kd_buf)), vp, ctx))) {
+ error = EFAULT;
+ goto check_error;
+ }
+ if (buffer)
+ buffer += (sizeof(kd_chunk_header_v3) + sizeof(uint64_t));
+ assert(count >= (sizeof(kd_chunk_header_v3) + sizeof(uint64_t)));
+ count -= (sizeof(kd_chunk_header_v3) + sizeof(uint64_t));
+ *number += (sizeof(kd_chunk_header_v3) + sizeof(uint64_t));
+ }
if (vp) {
- error = vn_rdwr(UIO_WRITE, vp, (caddr_t)kdcopybuf, tempbuf_number * sizeof(kd_buf), RAW_file_offset,
- UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, vfs_context_ucred(ctx), (int *) 0, vfs_context_proc(ctx));
-
- RAW_file_offset += (tempbuf_number * sizeof(kd_buf));
+ size_t write_size = tempbuf_number * sizeof(kd_buf);
+ error = kdbg_write_to_vnode((caddr_t)kdcopybuf, write_size, vp, ctx, RAW_file_offset);
+ if (!error)
+ RAW_file_offset += write_size;
if (RAW_file_written >= RAW_FLUSH_SIZE) {
cluster_push(vp, 0);
error = copyout(kdcopybuf, buffer, tempbuf_number * sizeof(kd_buf));
buffer += (tempbuf_number * sizeof(kd_buf));
}
+check_error:
if (error) {
*number = 0;
error = EINVAL;
}
-#define STACKSHOT_SUBSYS_LOCK() lck_mtx_lock(&stackshot_subsys_mutex)
-#define STACKSHOT_SUBSYS_UNLOCK() lck_mtx_unlock(&stackshot_subsys_mutex)
-#if defined(__i386__) || defined (__x86_64__)
-#define TRAP_DEBUGGER __asm__ volatile("int3");
-#endif
-
-#define SANE_TRACEBUF_SIZE (8 * 1024 * 1024)
-
-/* Initialize the mutex governing access to the stack snapshot subsystem */
-__private_extern__ void
-stackshot_lock_init( void )
+static int
+stackshot_kern_return_to_bsd_error(kern_return_t kr)
{
- 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);
+ switch (kr) {
+ case KERN_SUCCESS:
+ return 0;
+ case KERN_RESOURCE_SHORTAGE:
+ return ENOMEM;
+ case KERN_NO_SPACE:
+ return ENOSPC;
+ case KERN_NO_ACCESS:
+ return EPERM;
+ case KERN_MEMORY_PRESENT:
+ return EEXIST;
+ case KERN_NOT_SUPPORTED:
+ return ENOTSUP;
+ case KERN_NOT_IN_SET:
+ return ENOENT;
+ default:
+ return EINVAL;
+ }
}
+
/*
+ * DEPRECATION WARNING: THIS SYSCALL IS BEING REPLACED WITH SYS_stack_snapshot_with_config and SYS_microstackshot.
+ *
* 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
int
stack_snapshot(struct proc *p, register struct stack_snapshot_args *uap, int32_t *retval) {
int error = 0;
+ kern_return_t kr;
if ((error = suser(kauth_cred_get(), &p->p_acflag)))
return(error);
- return stack_snapshot2(uap->pid, uap->tracebuf, uap->tracebuf_size,
- uap->flags, uap->dispatch_offset, retval);
+ kr = stack_snapshot2(uap->pid, uap->tracebuf, uap->tracebuf_size, uap->flags, retval);
+ return stackshot_kern_return_to_bsd_error(kr);
}
+/*
+ * stack_snapshot_with_config: Obtains a coherent set of stack traces for specified threads on the sysem,
+ * tracing both kernel and user stacks where available. Allocates a buffer from the
+ * kernel and maps the buffer into the calling task's address space.
+ *
+ * Inputs: uap->stackshot_config_version - version of the stackshot config that is being passed
+ * uap->stackshot_config - pointer to the stackshot config
+ * uap->stackshot_config_size- size of the stackshot config being passed
+ * Outputs: EINVAL if there is a problem with the arguments
+ * EFAULT if we failed to copy in the arguments succesfully
+ * EPERM if the caller is not privileged
+ * ENOTSUP if the caller is passing a version of arguments that is not supported by the kernel
+ * (indicates libsyscall:kernel mismatch) or if the caller is requesting unsupported flags
+ * ENOENT if the caller is requesting an existing buffer that doesn't exist or if the
+ * requested PID isn't found
+ * ENOMEM if the kernel is unable to allocate enough memory to serve the request
+ * ENOSPC if there isn't enough space in the caller's address space to remap the buffer
+ * ESRCH if the target PID isn't found
+ * returns KERN_SUCCESS on success
+ */
int
-stack_snapshot2(pid_t pid, user_addr_t tracebuf, uint32_t tracebuf_size, uint32_t flags, uint32_t dispatch_offset, int32_t *retval)
+stack_snapshot_with_config(struct proc *p, struct stack_snapshot_with_config_args *uap, __unused int *retval)
{
int error = 0;
- unsigned bytesTraced = 0;
- boolean_t istate;
+ kern_return_t kr;
- *retval = -1;
-/* Serialize tracing */
- STACKSHOT_SUBSYS_LOCK();
-
- if ((tracebuf_size <= 0) || (tracebuf_size > SANE_TRACEBUF_SIZE)) {
- error = EINVAL;
- goto error_exit;
- }
+ if ((error = suser(kauth_cred_get(), &p->p_acflag)))
+ return(error);
- assert(stackshot_snapbuf == NULL);
- if (kmem_alloc_kobject(kernel_map, (vm_offset_t *)&stackshot_snapbuf, tracebuf_size) != KERN_SUCCESS) {
- error = ENOMEM;
- goto error_exit;
+ if((void*)uap->stackshot_config == NULL) {
+ return EINVAL;
}
- if (panic_active()) {
- error = ENOMEM;
- goto error_exit;
+ switch (uap->stackshot_config_version) {
+ case STACKSHOT_CONFIG_TYPE:
+ if (uap->stackshot_config_size != sizeof(stackshot_config_t)) {
+ return EINVAL;
+ }
+ stackshot_config_t config;
+ error = copyin(uap->stackshot_config, &config, sizeof(stackshot_config_t));
+ if (error != KERN_SUCCESS)
+ {
+ return EFAULT;
+ }
+ kr = kern_stack_snapshot_internal(uap->stackshot_config_version, &config, sizeof(stackshot_config_t), TRUE);
+ return stackshot_kern_return_to_bsd_error(kr);
+ default:
+ return ENOTSUP;
}
+}
- istate = ml_set_interrupts_enabled(FALSE);
-/* Preload trace parameters*/
- kdp_snapshot_preflight(pid, stackshot_snapbuf, tracebuf_size, flags, dispatch_offset);
-
-/* Trap to the debugger to obtain a coherent stack snapshot; this populates
- * the trace buffer
+#if CONFIG_TELEMETRY
+/*
+ * microstackshot: Catch all system call for microstackshot related operations, including
+ * enabling/disabling both global and windowed microstackshots as well
+ * as retrieving windowed or global stackshots and the boot profile.
+ * Inputs: uap->tracebuf - address of the user space destination
+ * buffer
+ * uap->tracebuf_size - size of the user space trace buffer
+ * uap->flags - various flags
+ * Outputs: EPERM if the caller is not privileged
+ * EINVAL if the supplied mss_args is NULL, mss_args.tracebuf is NULL or mss_args.tracebuf_size is not sane
+ * ENOMEM if we don't have enough memory to satisfy the request
+ * *retval contains the number of bytes traced, if successful
+ * and -1 otherwise.
*/
+int
+microstackshot(struct proc *p, struct microstackshot_args *uap, int32_t *retval)
+{
+ int error = 0;
+ kern_return_t kr;
- TRAP_DEBUGGER;
+ if ((error = suser(kauth_cred_get(), &p->p_acflag)))
+ return(error);
- ml_set_interrupts_enabled(istate);
+ kr = stack_microstackshot(uap->tracebuf, uap->tracebuf_size, uap->flags, retval);
+ return stackshot_kern_return_to_bsd_error(kr);
+}
+#endif /* CONFIG_TELEMETRY */
- 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;
- }
+/*
+ * kern_stack_snapshot_with_reason: Obtains a coherent set of stack traces for specified threads on the sysem,
+ * tracing both kernel and user stacks where available. Allocates a buffer from the
+ * kernel and stores the address of this buffer.
+ *
+ * Inputs: reason - the reason for triggering a stackshot (unused at the moment, but in the
+ * future will be saved in the stackshot)
+ * Outputs: EINVAL/ENOTSUP if there is a problem with the arguments
+ * EPERM if the caller doesn't pass at least one KERNEL stackshot flag
+ * ENOMEM if the kernel is unable to allocate enough memory to serve the request
+ * ESRCH if the target PID isn't found
+ * returns KERN_SUCCESS on success
+ */
+int
+kern_stack_snapshot_with_reason(__unused char *reason)
+{
+ stackshot_config_t config;
+ kern_return_t kr;
+
+ config.sc_pid = -1;
+ config.sc_flags = (STACKSHOT_SAVE_LOADINFO | STACKSHOT_GET_GLOBAL_MEM_STATS | STACKSHOT_SAVE_IN_KERNEL_BUFFER |
+ STACKSHOT_KCDATA_FORMAT);
+ config.sc_since_timestamp = 0;
+ config.sc_out_buffer_addr = 0;
+ config.sc_out_size_addr = 0;
+
+ kr = kern_stack_snapshot_internal(STACKSHOT_CONFIG_TYPE, &config, sizeof(stackshot_config_t), FALSE);
+ return stackshot_kern_return_to_bsd_error(kr);
+}
- error = kdp_stack_snapshot_geterror();
- if (error == -1) {
- error = ENOSPC;
- *retval = -1;
- goto error_exit;
+/*
+ * stack_snapshot_from_kernel: Stackshot function for kernel consumers who have their own buffer.
+ *
+ * Inputs: pid - the PID to be traced or -1 for the whole system
+ * buf - a pointer to the buffer where the stackshot should be written
+ * size - the size of the buffer
+ * flags - flags to be passed to the stackshot
+ * *bytes_traced - a pointer to be filled with the length of the stackshot
+ * Outputs: -1 if there is a problem with the arguments
+ * the error returned by the stackshot code otherwise
+ */
+int
+stack_snapshot_from_kernel(pid_t pid, void *buf, uint32_t size, uint32_t flags, unsigned *bytes_traced)
+{
+ kern_return_t kr;
+
+ kr = stack_snapshot_from_kernel_internal(pid, buf, size, flags, bytes_traced);
+ if (kr == KERN_FAILURE) {
+ return -1;
}
-error_exit:
- if (stackshot_snapbuf != NULL)
- kmem_free(kernel_map, (vm_offset_t) stackshot_snapbuf, tracebuf_size);
- stackshot_snapbuf = NULL;
- STACKSHOT_SUBSYS_UNLOCK();
- return error;
+ return kr;
}
void
-start_kern_tracing(unsigned int new_nkdbufs, boolean_t need_map) {
+start_kern_tracing(unsigned int new_nkdbufs, boolean_t need_map)
+{
if (!new_nkdbufs)
return;
nkdbufs = kdbg_set_nkdbufs(new_nkdbufs);
kdbg_lock_init();
- kdbg_reinit(TRUE);
- if (need_map == TRUE)
- kdbg_mapinit();
- kdbg_set_tracing_enabled(TRUE, KDEBUG_ENABLE_TRACE);
-#if defined(__i386__) || defined(__x86_64__)
- uint64_t now = mach_absolute_time();
+ kernel_debug_string_simple("start_kern_tracing");
+
+ if (0 == kdbg_reinit(TRUE)) {
+
+ if (need_map == TRUE) {
+ uint32_t old1, old2;
+
+ kdbg_thrmap_init();
+
+ disable_wrap(&old1, &old2);
+ }
+
+ /* Hold off interrupts until the early traces are cut */
+ boolean_t s = ml_set_interrupts_enabled(FALSE);
- KERNEL_DEBUG_CONSTANT((TRACEDBG_CODE(DBG_TRACE_INFO, 1)) | DBG_FUNC_NONE,
- (uint32_t)(tsc_rebase_abs_time >> 32), (uint32_t)tsc_rebase_abs_time,
- (uint32_t)(now >> 32), (uint32_t)now,
- 0);
+ kdbg_set_tracing_enabled(
+ TRUE,
+ kdebug_serial ?
+ (KDEBUG_ENABLE_TRACE | KDEBUG_ENABLE_SERIAL) :
+ KDEBUG_ENABLE_TRACE);
+
+ /*
+ * Transfer all very early events from the static buffer
+ * into the real buffers.
+ */
+ kernel_debug_early_end();
+
+ ml_set_interrupts_enabled(s);
+
+ printf("kernel tracing started\n");
+#if KDEBUG_MOJO_TRACE
+ if (kdebug_serial) {
+ printf("serial output enabled with %lu named events\n",
+ sizeof(kd_events)/sizeof(kd_event_t));
+ }
#endif
- printf("kernel tracing started\n");
+ } else {
+ printf("error from kdbg_reinit, kernel tracing not started\n");
+ }
+}
+
+void
+start_kern_tracing_with_typefilter(unsigned int new_nkdbufs,
+ boolean_t need_map,
+ unsigned int typefilter)
+{
+ /* startup tracing */
+ start_kern_tracing(new_nkdbufs, need_map);
+
+ /* check that tracing was actually enabled */
+ if (!(kdebug_enable & KDEBUG_ENABLE_TRACE))
+ return;
+
+ /* setup the typefiltering */
+ if (0 == kdbg_enable_typefilter())
+ setbit(type_filter_bitmap,
+ typefilter & (KDBG_CSC_MASK >> KDBG_CSC_OFFSET));
}
void
* The global pid exists, we're running
* due to fs_usage, latency, etc...
* don't cut the panic/shutdown trace file
+ * Disable tracing from this point to avoid
+ * perturbing state.
*/
+ kdebug_enable = 0;
+ kd_ctrl_page.enabled = 0;
+ commpage_update_kdebug_enable();
return;
}
}
- KERNEL_DEBUG_CONSTANT((TRACEDBG_CODE(DBG_TRACE_INFO, 0)) | DBG_FUNC_NONE, 0, 0, 0, 0, 0);
+ KERNEL_DEBUG_CONSTANT(TRACE_PANIC | DBG_FUNC_NONE, 0, 0, 0, 0, 0);
kdebug_enable = 0;
kd_ctrl_page.enabled = 0;
+ commpage_update_kdebug_enable();
ctx = vfs_context_kernel();
if ((error = vnode_open(filename, (O_CREAT | FWRITE | O_NOFOLLOW), 0600, 0, &vp, ctx)))
return;
- number = kd_mapsize;
- kdbg_readmap(0, &number, vp, ctx);
+ number = kd_mapcount * sizeof(kd_threadmap);
+ kdbg_readthrmap(0, &number, vp, ctx);
number = nkdbufs*sizeof(kd_buf);
- kdbg_read(0, &number, vp, ctx);
+ kdbg_read(0, &number, vp, ctx, RAW_VERSION1);
vnode_close(vp, FWRITE, ctx);
snprintf(name_buf, len, "%p [!bsd]", task);
}
+#if KDEBUG_MOJO_TRACE
+static kd_event_t *
+binary_search(uint32_t id)
+{
+ int low, high, mid;
+ low = 0;
+ high = sizeof(kd_events)/sizeof(kd_event_t) - 1;
-#if defined(NATIVE_TRACE_FACILITY)
-void trace_handler_map_ctrl_page(__unused uintptr_t addr, __unused size_t ctrl_page_size, __unused size_t storage_size, __unused size_t kds_ptr_size)
-{
-}
-void trace_handler_map_bufinfo(__unused uintptr_t addr, __unused size_t size)
-{
-}
-void trace_handler_unmap_bufinfo(void)
-{
+ while (TRUE)
+ {
+ mid = (low + high) / 2;
+
+ if (low > high)
+ return NULL; /* failed */
+ else if ( low + 1 >= high) {
+ /* We have a match */
+ if (kd_events[high].id == id)
+ return &kd_events[high];
+ else if (kd_events[low].id == id)
+ return &kd_events[low];
+ else
+ return NULL; /* search failed */
+ }
+ else if (id < kd_events[mid].id)
+ high = mid;
+ else
+ low = mid;
+ }
}
-void trace_handler_map_buffer(__unused int index, __unused uintptr_t addr, __unused size_t size)
+
+/*
+ * Look up event id to get name string.
+ * Using a per-cpu cache of a single entry
+ * before resorting to a binary search of the full table.
+ */
+#define NCACHE 1
+static kd_event_t *last_hit[MAX_CPUS];
+static kd_event_t *
+event_lookup_cache(uint32_t cpu, uint32_t id)
{
+ if (last_hit[cpu] == NULL || last_hit[cpu]->id != id)
+ last_hit[cpu] = binary_search(id);
+ return last_hit[cpu];
}
-void trace_handler_unmap_buffer(__unused int index)
+
+static uint64_t kd_last_timstamp;
+
+static void
+kdebug_serial_print(
+ uint32_t cpunum,
+ uint32_t debugid,
+ uint64_t timestamp,
+ uintptr_t arg1,
+ uintptr_t arg2,
+ uintptr_t arg3,
+ uintptr_t arg4,
+ uintptr_t threadid
+ )
{
+ char kprintf_line[192];
+ char event[40];
+ uint64_t us = timestamp / NSEC_PER_USEC;
+ uint64_t us_tenth = (timestamp % NSEC_PER_USEC) / 100;
+ uint64_t delta = timestamp - kd_last_timstamp;
+ uint64_t delta_us = delta / NSEC_PER_USEC;
+ uint64_t delta_us_tenth = (delta % NSEC_PER_USEC) / 100;
+ uint32_t event_id = debugid & KDBG_EVENTID_MASK;
+ const char *command;
+ const char *bra;
+ const char *ket;
+ kd_event_t *ep;
+
+ /* event time and delta from last */
+ snprintf(kprintf_line, sizeof(kprintf_line),
+ "%11llu.%1llu %8llu.%1llu ",
+ us, us_tenth, delta_us, delta_us_tenth);
+
+
+ /* event (id or name) - start prefixed by "[", end postfixed by "]" */
+ bra = (debugid & DBG_FUNC_START) ? "[" : " ";
+ ket = (debugid & DBG_FUNC_END) ? "]" : " ";
+ ep = event_lookup_cache(cpunum, event_id);
+ if (ep) {
+ if (strlen(ep->name) < sizeof(event) - 3)
+ snprintf(event, sizeof(event), "%s%s%s",
+ bra, ep->name, ket);
+ else
+ snprintf(event, sizeof(event), "%s%x(name too long)%s",
+ bra, event_id, ket);
+ } else {
+ snprintf(event, sizeof(event), "%s%x%s",
+ bra, event_id, ket);
+ }
+ snprintf(kprintf_line + strlen(kprintf_line),
+ sizeof(kprintf_line) - strlen(kprintf_line),
+ "%-40s ", event);
+
+ /* arg1 .. arg4 with special cases for strings */
+ switch (event_id) {
+ case VFS_LOOKUP:
+ case VFS_LOOKUP_DONE:
+ if (debugid & DBG_FUNC_START) {
+ /* arg1 hex then arg2..arg4 chars */
+ snprintf(kprintf_line + strlen(kprintf_line),
+ sizeof(kprintf_line) - strlen(kprintf_line),
+ "%-16lx %-8s%-8s%-8s ",
+ arg1, (char*)&arg2, (char*)&arg3, (char*)&arg4);
+ break;
+ }
+ /* else fall through for arg1..arg4 chars */
+ case TRACE_STRING_EXEC:
+ case TRACE_STRING_NEWTHREAD:
+ case TRACE_INFO_STRING:
+ snprintf(kprintf_line + strlen(kprintf_line),
+ sizeof(kprintf_line) - strlen(kprintf_line),
+ "%-8s%-8s%-8s%-8s ",
+ (char*)&arg1, (char*)&arg2, (char*)&arg3, (char*)&arg4);
+ break;
+ default:
+ snprintf(kprintf_line + strlen(kprintf_line),
+ sizeof(kprintf_line) - strlen(kprintf_line),
+ "%-16lx %-16lx %-16lx %-16lx",
+ arg1, arg2, arg3, arg4);
+ }
+
+ /* threadid, cpu and command name */
+ if (threadid == (uintptr_t)thread_tid(current_thread()) &&
+ current_proc() &&
+ current_proc()->p_comm[0])
+ command = current_proc()->p_comm;
+ else
+ command = "-";
+ snprintf(kprintf_line + strlen(kprintf_line),
+ sizeof(kprintf_line) - strlen(kprintf_line),
+ " %-16lx %-2d %s\n",
+ threadid, cpunum, command);
+
+ kprintf("%s", kprintf_line);
+ kd_last_timstamp = timestamp;
}
#endif
projects / apple / xnu.git / blobdiff