/*
- * Copyright (c) 2000-2016 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2020 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <kdp/kdp_callout.h>
#include <kern/cpu_number.h>
#include <kern/kalloc.h>
+#include <kern/percpu.h>
#include <kern/spl.h>
#include <kern/thread.h>
#include <kern/assert.h>
#include <kern/telemetry.h>
#include <kern/ecc.h>
#include <kern/kern_cdata.h>
-#include <kern/zalloc.h>
+#include <kern/zalloc_internal.h>
#include <vm/vm_kern.h>
+#include <vm/vm_map.h>
#include <vm/pmap.h>
#include <stdarg.h>
#include <stdatomic.h>
#include <kern/processor.h>
#if defined(__i386__) || defined(__x86_64__)
+#include <IOKit/IOBSD.h>
+
#include <i386/cpu_threads.h>
#include <i386/pmCPU.h>
#endif
#include <libkern/section_keywords.h>
#include <uuid/uuid.h>
#include <mach_debug/zone_info.h>
+#include <mach/resource_monitors.h>
#include <os/log_private.h>
-#if CONFIG_EMBEDDED
+#if defined(__arm__) || defined(__arm64__)
#include <pexpert/pexpert.h> /* For gPanicBase */
#include <arm/caches_internal.h>
#include <arm/misc_protos.h>
extern int vsnprintf(char *, size_t, const char *, va_list);
#endif
+#if CONFIG_CSR
+#include <sys/csr.h>
+#endif
+
+extern int IODTGetLoaderInfo( const char *key, void **infoAddr, int *infosize );
+
unsigned int halt_in_debugger = 0;
unsigned int current_debugger = 0;
unsigned int active_debugger = 0;
unsigned int panicDebugging = FALSE;
-unsigned int kdebug_serial = FALSE;
unsigned int kernel_debugger_entry_count = 0;
-#if !defined (__x86_64__)
+#if defined(__arm__) || defined(__arm64__)
struct additional_panic_data_buffer *panic_data_buffers = NULL;
#endif
#define panic_stop() panic_spin_forever()
#endif
-#define CPUDEBUGGEROP PROCESSOR_DATA(current_processor(), debugger_state).db_current_op
-#define CPUDEBUGGERMSG PROCESSOR_DATA(current_processor(), debugger_state).db_message
-#define CPUPANICSTR PROCESSOR_DATA(current_processor(), debugger_state).db_panic_str
-#define CPUPANICARGS PROCESSOR_DATA(current_processor(), debugger_state).db_panic_args
-#define CPUPANICOPTS PROCESSOR_DATA(current_processor(), debugger_state).db_panic_options
-#define CPUPANICDATAPTR PROCESSOR_DATA(current_processor(), debugger_state).db_panic_data_ptr
-#define CPUDEBUGGERSYNC PROCESSOR_DATA(current_processor(), debugger_state).db_proceed_on_sync_failure
-#define CPUDEBUGGERCOUNT PROCESSOR_DATA(current_processor(), debugger_state).db_entry_count
-#define CPUDEBUGGERRET PROCESSOR_DATA(current_processor(), debugger_state).db_op_return
-#define CPUPANICCALLER PROCESSOR_DATA(current_processor(), debugger_state).db_panic_caller
+struct debugger_state {
+ uint64_t db_panic_options;
+ debugger_op db_current_op;
+ boolean_t db_proceed_on_sync_failure;
+ const char *db_message;
+ const char *db_panic_str;
+ va_list *db_panic_args;
+ void *db_panic_data_ptr;
+ unsigned long db_panic_caller;
+ /* incremented whenever we panic or call Debugger (current CPU panic level) */
+ uint32_t db_entry_count;
+ kern_return_t db_op_return;
+};
+static struct debugger_state PERCPU_DATA(debugger_state);
+
+/* __pure2 is correct if this function is called with preemption disabled */
+static inline __pure2 struct debugger_state *
+current_debugger_state(void)
+{
+ return PERCPU_GET(debugger_state);
+}
+
+#define CPUDEBUGGEROP current_debugger_state()->db_current_op
+#define CPUDEBUGGERMSG current_debugger_state()->db_message
+#define CPUPANICSTR current_debugger_state()->db_panic_str
+#define CPUPANICARGS current_debugger_state()->db_panic_args
+#define CPUPANICOPTS current_debugger_state()->db_panic_options
+#define CPUPANICDATAPTR current_debugger_state()->db_panic_data_ptr
+#define CPUDEBUGGERSYNC current_debugger_state()->db_proceed_on_sync_failure
+#define CPUDEBUGGERCOUNT current_debugger_state()->db_entry_count
+#define CPUDEBUGGERRET current_debugger_state()->db_op_return
+#define CPUPANICCALLER current_debugger_state()->db_panic_caller
#if DEVELOPMENT || DEBUG
-#define DEBUGGER_DEBUGGING_NESTED_PANIC_IF_REQUESTED(requested) \
-MACRO_BEGIN \
- if (requested) { \
- volatile int *badpointer = (int *)4; \
- *badpointer = 0; \
- } \
+#define DEBUGGER_DEBUGGING_NESTED_PANIC_IF_REQUESTED(requested) \
+MACRO_BEGIN \
+ if (requested) { \
+ volatile int *badpointer = (int *)4; \
+ *badpointer = 0; \
+ } \
MACRO_END
#endif /* DEVELOPMENT || DEBUG */
const char *debugger_message = NULL;
unsigned long debugger_panic_caller = 0;
-void panic_trap_to_debugger(const char *panic_format_str, va_list *panic_args, unsigned int reason, void *ctx,
- uint64_t panic_options_mask, void *panic_data, unsigned long panic_caller);
-static void kdp_machine_reboot_type(unsigned int type);
-__attribute__((noreturn)) void panic_spin_forever(void);
+void panic_trap_to_debugger(const char *panic_format_str, va_list *panic_args,
+ unsigned int reason, void *ctx, uint64_t panic_options_mask, void *panic_data,
+ unsigned long panic_caller) __dead2;
+static void kdp_machine_reboot_type(unsigned int type, uint64_t debugger_flags);
+void panic_spin_forever(void) __dead2;
extern kern_return_t do_stackshot(void);
-
-int mach_assert = 1;
+extern void PE_panic_hook(const char*);
#define NESTEDDEBUGGERENTRYMAX 5
+static unsigned int max_debugger_entry_count = NESTEDDEBUGGERENTRYMAX;
-#if CONFIG_EMBEDDED
+#if defined(__arm__) || defined(__arm64__)
#define DEBUG_BUF_SIZE (4096)
-#define KDBG_TRACE_PANIC_FILENAME "/var/log/panic.trace"
-#else
-/*
- * EXTENDED_/DEBUG_BUF_SIZE can't grow without updates to SMC and iBoot to store larger panic logs on co-processor systems */
-#define DEBUG_BUF_SIZE ((3 * PAGE_SIZE) + offsetof(struct macos_panic_header, mph_data))
-#define EXTENDED_DEBUG_BUF_SIZE 0x0013ff80
-static_assert(((EXTENDED_DEBUG_BUF_SIZE % PANIC_FLUSH_BOUNDARY) == 0), "Extended debug buf size must match SMC alignment requirements");
-#define KDBG_TRACE_PANIC_FILENAME "/var/tmp/panic.trace"
-#endif
-/* debug_buf is directly linked with iBoot panic region for embedded targets */
-#if CONFIG_EMBEDDED
+/* debug_buf is directly linked with iBoot panic region for arm targets */
char *debug_buf_base = NULL;
char *debug_buf_ptr = NULL;
unsigned int debug_buf_size = 0;
-#else
+
+SECURITY_READ_ONLY_LATE(boolean_t) kdp_explicitly_requested = FALSE;
+#else /* defined(__arm__) || defined(__arm64__) */
+#define DEBUG_BUF_SIZE ((3 * PAGE_SIZE) + offsetof(struct macos_panic_header, mph_data))
+/* EXTENDED_DEBUG_BUF_SIZE definition is now in debug.h */
+static_assert(((EXTENDED_DEBUG_BUF_SIZE % PANIC_FLUSH_BOUNDARY) == 0), "Extended debug buf size must match SMC alignment requirements");
+
char debug_buf[DEBUG_BUF_SIZE];
struct macos_panic_header *panic_info = (struct macos_panic_header *)debug_buf;
char *debug_buf_base = (debug_buf + offsetof(struct macos_panic_header, mph_data));
unsigned int debug_buf_size = (DEBUG_BUF_SIZE - offsetof(struct macos_panic_header, mph_data));
boolean_t extended_debug_log_enabled = FALSE;
+#endif /* defined(__arm__) || defined(__arm64__) */
+
+#if defined(XNU_TARGET_OS_OSX)
+#define KDBG_TRACE_PANIC_FILENAME "/var/tmp/panic.trace"
+#else
+#define KDBG_TRACE_PANIC_FILENAME "/var/log/panic.trace"
#endif
/* Debugger state */
uuid_t kernelcache_uuid;
uuid_string_t kernelcache_uuid_string;
+boolean_t pageablekc_uuid_valid = FALSE;
+uuid_t pageablekc_uuid;
+uuid_string_t pageablekc_uuid_string;
+
+boolean_t auxkc_uuid_valid = FALSE;
+uuid_t auxkc_uuid;
+uuid_string_t auxkc_uuid_string;
+
/*
* By default we treat Debugger() the same as calls to panic(), unless
* we have debug boot-args present and the DB_KERN_DUMP_ON_NMI *NOT* set.
*/
static boolean_t debugger_is_panic = TRUE;
-#if DEVELOPMENT || DEBUG
-boolean_t debug_boot_arg_inited = FALSE;
-#endif
-
-SECURITY_READ_ONLY_LATE(unsigned int) debug_boot_arg;
+TUNABLE(unsigned int, debug_boot_arg, "debug", 0);
char kernel_uuid_string[37]; /* uuid_string_t */
char kernelcache_uuid_string[37]; /* uuid_string_t */
FALSE;
#endif
-void
+/*
+ * Maintain the physically-contiguous carveout for the `phys_carveout_mb`
+ * boot-arg.
+ */
+SECURITY_READ_ONLY_LATE(vm_offset_t) phys_carveout = 0;
+SECURITY_READ_ONLY_LATE(uintptr_t) phys_carveout_pa = 0;
+SECURITY_READ_ONLY_LATE(size_t) phys_carveout_size = 0;
+
+boolean_t
+kernel_debugging_allowed(void)
+{
+#if XNU_TARGET_OS_OSX
+#if CONFIG_CSR
+ if (csr_check(CSR_ALLOW_KERNEL_DEBUGGER) != 0) {
+ return FALSE;
+ }
+#endif /* CONFIG_CSR */
+ return TRUE;
+#else /* XNU_TARGET_OS_OSX */
+ return PE_i_can_has_debugger(NULL);
+#endif /* XNU_TARGET_OS_OSX */
+}
+
+__startup_func
+static void
panic_init(void)
{
unsigned long uuidlen = 0;
uuid_unparse_upper(*(uuid_t *)uuid, kernel_uuid_string);
}
- if (!PE_parse_boot_argn("assertions", &mach_assert, sizeof(mach_assert))) {
- mach_assert = 1;
- }
-
/*
- * Initialize the value of the debug boot-arg
+ * Take the value of the debug boot-arg into account
*/
- debug_boot_arg = 0;
-#if ((CONFIG_EMBEDDED && MACH_KDP) || defined(__x86_64__))
- if (PE_parse_boot_argn("debug", &debug_boot_arg, sizeof(debug_boot_arg))) {
-#if DEVELOPMENT || DEBUG
+#if MACH_KDP
+ if (kernel_debugging_allowed() && debug_boot_arg) {
if (debug_boot_arg & DB_HALT) {
halt_in_debugger = 1;
}
-#endif
-#if CONFIG_EMBEDDED
+#if defined(__arm__) || defined(__arm64__)
if (debug_boot_arg & DB_NMI) {
panicDebugging = TRUE;
}
#else
panicDebugging = TRUE;
-#if KDEBUG_MOJO_TRACE
- if (debug_boot_arg & DB_PRT_KDEBUG) {
- kdebug_serial = TRUE;
- }
-#endif
-#endif /* CONFIG_EMBEDDED */
+#endif /* defined(__arm__) || defined(__arm64__) */
}
-#endif /* ((CONFIG_EMBEDDED && MACH_KDP) || defined(__x86_64__)) */
-#if DEVELOPMENT || DEBUG
- debug_boot_arg_inited = TRUE;
-#endif
+ if (!PE_parse_boot_argn("nested_panic_max", &max_debugger_entry_count, sizeof(max_debugger_entry_count))) {
+ max_debugger_entry_count = NESTEDDEBUGGERENTRYMAX;
+ }
+
+#if defined(__arm__) || defined(__arm64__)
+ char kdpname[80];
+
+ kdp_explicitly_requested = PE_parse_boot_argn("kdp_match_name", kdpname, sizeof(kdpname));
+#endif /* defined(__arm__) || defined(__arm64__) */
-#if !CONFIG_EMBEDDED
+#endif /* MACH_KDP */
+
+#if defined (__x86_64__)
/*
* By default we treat Debugger() the same as calls to panic(), unless
* we have debug boot-args present and the DB_KERN_DUMP_ON_NMI *NOT* set.
}
#endif
}
+STARTUP(TUNABLES, STARTUP_RANK_MIDDLE, panic_init);
#if defined (__x86_64__)
void
* Allocate an extended panic log buffer that has space for the panic
* stackshot at the end. Update the debug buf pointers appropriately
* to point at this new buffer.
- */
- char *new_debug_buf = kalloc(EXTENDED_DEBUG_BUF_SIZE);
- /*
+ *
* iBoot pre-initializes the panic region with the NULL character. We set this here
* so we can accurately calculate the CRC for the region without needing to flush the
* full region over SMC.
*/
- memset(new_debug_buf, '\0', EXTENDED_DEBUG_BUF_SIZE);
+ char *new_debug_buf = kalloc_flags(EXTENDED_DEBUG_BUF_SIZE, Z_WAITOK | Z_ZERO);
panic_info = (struct macos_panic_header *)new_debug_buf;
debug_buf_ptr = debug_buf_base = (new_debug_buf + offsetof(struct macos_panic_header, mph_data));
debug_buf_size = (EXTENDED_DEBUG_BUF_SIZE - offsetof(struct macos_panic_header, mph_data));
extended_debug_log_enabled = TRUE;
+
+ /*
+ * Insert a compiler barrier so we don't free the other panic stackshot buffer
+ * until after we've marked the new one as available
+ */
+ __compiler_barrier();
+ kmem_free(kernel_map, panic_stackshot_buf, panic_stackshot_buf_len);
+ panic_stackshot_buf = 0;
+ panic_stackshot_buf_len = 0;
}
#endif /* defined (__x86_64__) */
void
debug_log_init(void)
{
-#if CONFIG_EMBEDDED
+#if defined(__arm__) || defined(__arm64__)
if (!gPanicBase) {
printf("debug_log_init: Error!! gPanicBase is still not initialized\n");
return;
debug_buf_ptr = debug_buf_base;
debug_buf_size = gPanicSize - sizeof(struct embedded_panic_header);
#else
+ kern_return_t kr = KERN_SUCCESS;
bzero(panic_info, DEBUG_BUF_SIZE);
assert(debug_buf_base != NULL);
assert(debug_buf_ptr != NULL);
assert(debug_buf_size != 0);
+
+ /*
+ * We allocate a buffer to store a panic time stackshot. If we later discover that this is a
+ * system that supports flushing a stackshot via an extended debug log (see above), we'll free this memory
+ * as it's not necessary on this platform. This information won't be available until the IOPlatform has come
+ * up.
+ */
+ kr = kmem_alloc(kernel_map, &panic_stackshot_buf, PANIC_STACKSHOT_BUFSIZE, VM_KERN_MEMORY_DIAG);
+ assert(kr == KERN_SUCCESS);
+ if (kr == KERN_SUCCESS) {
+ panic_stackshot_buf_len = PANIC_STACKSHOT_BUFSIZE;
+ }
#endif
}
+void
+phys_carveout_init(void)
+{
+ if (!PE_i_can_has_debugger(NULL)) {
+ return;
+ }
+
+ unsigned int phys_carveout_mb = 0;
+
+ if (!PE_parse_boot_argn("phys_carveout_mb", &phys_carveout_mb,
+ sizeof(phys_carveout_mb))) {
+ return;
+ }
+ if (phys_carveout_mb == 0) {
+ return;
+ }
+
+ size_t size = 0;
+ if (os_mul_overflow(phys_carveout_mb, 1024 * 1024, &size)) {
+ printf("phys_carveout_mb size overflowed (%uMB)\n",
+ phys_carveout_mb);
+ return;
+ }
+
+ kern_return_t kr = kmem_alloc_contig(kernel_map, &phys_carveout, size,
+ VM_MAP_PAGE_MASK(kernel_map), 0, 0, KMA_NOPAGEWAIT,
+ VM_KERN_MEMORY_DIAG);
+ if (kr != KERN_SUCCESS) {
+ printf("failed to allocate %uMB for phys_carveout_mb: %u\n",
+ phys_carveout_mb, (unsigned int)kr);
+ return;
+ }
+
+ phys_carveout_pa = kvtophys(phys_carveout);
+ phys_carveout_size = size;
+}
+
static void
-DebuggerLock()
+DebuggerLock(void)
{
int my_cpu = cpu_number();
int debugger_exp_cpu = DEBUGGER_NO_CPU;
assert(ml_get_interrupts_enabled() == FALSE);
- if (debugger_cpu == my_cpu) {
+ if (atomic_load(&debugger_cpu) == my_cpu) {
return;
}
}
static void
-DebuggerUnlock()
+DebuggerUnlock(void)
{
- assert(debugger_cpu == cpu_number());
+ assert(atomic_load_explicit(&debugger_cpu, memory_order_relaxed) == cpu_number());
/*
* We don't do an atomic exchange here in case
* lock so we can simply store DEBUGGER_NO_CPU and follow with
* a barrier.
*/
- debugger_cpu = DEBUGGER_NO_CPU;
+ atomic_store(&debugger_cpu, DEBUGGER_NO_CPU);
OSMemoryBarrier();
return;
static kern_return_t
DebuggerHaltOtherCores(boolean_t proceed_on_failure)
{
-#if CONFIG_EMBEDDED
+#if defined(__arm__) || defined(__arm64__)
return DebuggerXCallEnter(proceed_on_failure);
-#else /* CONFIG_EMBEDDED */
+#else /* defined(__arm__) || defined(__arm64__) */
#pragma unused(proceed_on_failure)
mp_kdp_enter(proceed_on_failure);
return KERN_SUCCESS;
}
static void
-DebuggerResumeOtherCores()
+DebuggerResumeOtherCores(void)
{
-#if CONFIG_EMBEDDED
+#if defined(__arm__) || defined(__arm64__)
DebuggerXCallReturn();
-#else /* CONFIG_EMBEDDED */
+#else /* defined(__arm__) || defined(__arm64__) */
mp_kdp_exit();
#endif
}
}
/*
- * Save the requested debugger state/action into the current processor's processor_data
- * and trap to the debugger.
+ * Save the requested debugger state/action into the current processor's
+ * percu state and trap to the debugger.
*/
kern_return_t
DebuggerTrapWithState(debugger_op db_op, const char *db_message, const char *db_panic_str,
db_panic_options, db_panic_data_ptr,
db_proceed_on_sync_failure, db_panic_caller);
+ /*
+ * On ARM this generates an uncategorized exception -> sleh code ->
+ * DebuggerCall -> kdp_trap -> handle_debugger_trap
+ * So that is how XNU ensures that only one core can panic.
+ * The rest of the cores are halted by IPI if possible; if that
+ * fails it will fall back to dbgwrap.
+ */
TRAP_DEBUGGER;
ret = CPUDEBUGGERRET;
const char *expression
)
{
+#if CONFIG_NONFATAL_ASSERTS
+ static TUNABLE(bool, mach_assert, "assertions", true);
+
if (!mach_assert) {
kprintf("%s:%d non-fatal Assertion: %s", file, line, expression);
return;
}
+#endif
panic_plain("%s:%d Assertion failed: %s", file, line, expression);
}
+boolean_t
+debug_is_current_cpu_in_panic_state(void)
+{
+ return current_debugger_state()->db_entry_count > 0;
+}
void
Debugger(const char *message)
CPUDEBUGGERCOUNT++;
- if (CPUDEBUGGERCOUNT > NESTEDDEBUGGERENTRYMAX) {
+ if (CPUDEBUGGERCOUNT > max_debugger_entry_count) {
static boolean_t in_panic_kprintf = FALSE;
/* Notify any listeners that we've started a panic */
- PEHaltRestart(kPEPanicBegin);
+ uint32_t panic_details = 0;
+ if (debugger_options_mask & DEBUGGER_OPTION_PANICLOGANDREBOOT) {
+ panic_details |= kPanicDetailsForcePowerOff;
+ }
+ PEHaltRestartInternal(kPEPanicBegin, panic_details);
if (!in_panic_kprintf) {
in_panic_kprintf = TRUE;
kprintf("Detected nested debugger entry count exceeding %d\n",
- NESTEDDEBUGGERENTRYMAX);
+ max_debugger_entry_count);
in_panic_kprintf = FALSE;
}
if (!panicDebugging) {
- kdp_machine_reboot_type(kPEPanicRestartCPU);
+ kdp_machine_reboot_type(kPEPanicRestartCPU, debugger_options_mask);
}
panic_spin_forever();
}
+ /* Handle any necessary platform specific actions before we proceed */
+ PEInitiatePanic();
+
#if DEVELOPMENT || DEBUG
DEBUGGER_DEBUGGING_NESTED_PANIC_IF_REQUESTED((debugger_options_mask & DEBUGGER_OPTION_RECURPANIC_ENTRY));
#endif
}
}
-#if !defined (__x86_64__)
+#if defined(__arm__) || defined(__arm64__)
/*
* Register an additional buffer with data to include in the panic log
*
return;
}
-#endif /* !defined (__x86_64__) */
+#endif /* defined(__arm__) || defined(__arm64__) */
/*
* An overview of the xnu panic path:
*
* Several panic wrappers (panic(), panic_with_options(), etc.) all funnel into panic_trap_to_debugger().
- * panic_trap_to_debugger() sets the panic state in the current processor's processor_data_t prior
+ * panic_trap_to_debugger() sets the panic state in the current processor's debugger_state prior
* to trapping into the debugger. Once we trap to the debugger, we end up in handle_debugger_trap()
* which tries to acquire the panic lock by atomically swapping the current CPU number into debugger_cpu.
* debugger_cpu acts as a synchronization point, from which the winning CPU can halt the other cores and
panic_with_thread_context(unsigned int reason, void *ctx, uint64_t debugger_options_mask, thread_t thread, const char *str, ...)
{
va_list panic_str_args;
+ __assert_only os_ref_count_t th_ref_count;
assert_thread_magic(thread);
+ th_ref_count = os_ref_get_count(&thread->ref_count);
+ assertf(th_ref_count > 0, "panic_with_thread_context called with invalid thread %p with refcount %u", thread, th_ref_count);
/* Take a reference on the thread so it doesn't disappear by the time we try to backtrace it */
thread_reference(thread);
mmiotrace_enabled = 0;
#endif
- if (ml_wants_panic_trap_to_debugger()) {
- ml_panic_trap_to_debugger(panic_format_str, panic_args, reason, ctx, panic_options_mask, panic_caller);
-
- /*
- * This should not return, but we return here for the tail call
- * as it simplifies the backtrace.
- */
- return;
- }
+ ml_panic_trap_to_debugger(panic_format_str, panic_args, reason, ctx, panic_options_mask, panic_caller);
CPUDEBUGGERCOUNT++;
- if (CPUDEBUGGERCOUNT > NESTEDDEBUGGERENTRYMAX) {
+ if (CPUDEBUGGERCOUNT > max_debugger_entry_count) {
static boolean_t in_panic_kprintf = FALSE;
/* Notify any listeners that we've started a panic */
- PEHaltRestart(kPEPanicBegin);
+ uint32_t panic_details = 0;
+ if (panic_options_mask & DEBUGGER_OPTION_PANICLOGANDREBOOT) {
+ panic_details |= kPanicDetailsForcePowerOff;
+ }
+ PEHaltRestartInternal(kPEPanicBegin, panic_details);
if (!in_panic_kprintf) {
in_panic_kprintf = TRUE;
kprintf("Detected nested debugger entry count exceeding %d\n",
- NESTEDDEBUGGERENTRYMAX);
+ max_debugger_entry_count);
in_panic_kprintf = FALSE;
}
if (!panicDebugging) {
- kdp_machine_reboot_type(kPEPanicRestartCPU);
+ kdp_machine_reboot_type(kPEPanicRestartCPU, panic_options_mask);
}
panic_spin_forever();
}
+ /* Handle any necessary platform specific actions before we proceed */
+ PEInitiatePanic();
+
#if DEVELOPMENT || DEBUG
DEBUGGER_DEBUGGING_NESTED_PANIC_IF_REQUESTED((panic_options_mask & DEBUGGER_OPTION_RECURPANIC_ENTRY));
#endif
-#if CONFIG_EMBEDDED
- if (PE_arm_debug_panic_hook) {
- PE_arm_debug_panic_hook(panic_format_str);
- }
-#endif
+ PE_panic_hook(panic_format_str);
#if defined (__x86_64__)
plctrace_disable();
* Not reached.
*/
panic_stop();
+ __builtin_unreachable();
}
-__attribute__((noreturn))
void
-panic_spin_forever()
+panic_spin_forever(void)
{
paniclog_append_noflush("\nPlease go to https://panic.apple.com to report this panic\n");
}
static void
-kdp_machine_reboot_type(unsigned int type)
+kdp_machine_reboot_type(unsigned int type, uint64_t debugger_flags)
{
- printf("Attempting system restart...");
- PEHaltRestart(type);
+ printf("Attempting system restart...\n");
+ if ((type == kPEPanicRestartCPU) && (debugger_flags & DEBUGGER_OPTION_SKIP_PANICEND_CALLOUTS)) {
+ PEHaltRestart(kPEPanicRestartCPUNoCallouts);
+ } else {
+ PEHaltRestart(type);
+ }
halt_all_cpus(TRUE);
}
void
kdp_machine_reboot(void)
{
- kdp_machine_reboot_type(kPEPanicRestartCPU);
+ kdp_machine_reboot_type(kPEPanicRestartCPU, 0);
}
/*
* panicking. Only do this for Debugger() calls if we're treating
* Debugger() calls like panic().
*/
- PEHaltRestart(kPEPanicBegin);
+ uint32_t panic_details = 0;
+ if (debugger_panic_options & DEBUGGER_OPTION_PANICLOGANDREBOOT) {
+ panic_details |= kPanicDetailsForcePowerOff;
+ }
+ PEHaltRestartInternal(kPEPanicBegin, panic_details);
/*
* Set the begin pointer in the panic log structure. We key off of this
/* DEBUGGER_OPTION_PANICLOGANDREBOOT is used for two finger resets on embedded so we get a paniclog */
if (debugger_panic_options & DEBUGGER_OPTION_PANICLOGANDREBOOT) {
- PEHaltRestart(kPEPanicRestartCPU);
+ PEHaltRestart(kPEPanicRestartCPUNoCallouts);
}
}
*/
if ((debugger_panic_options & DEBUGGER_OPTION_SKIP_LOCAL_COREDUMP) &&
(debug_boot_arg & DB_REBOOT_POST_CORE)) {
- kdp_machine_reboot_type(kPEPanicRestartCPU);
+ kdp_machine_reboot_type(kPEPanicRestartCPU, debugger_panic_options);
}
/*
* Consider generating a local corefile if the infrastructure is configured
* and we haven't disabled on-device coredumps.
*/
- if (!(debug_boot_arg & DB_DISABLE_LOCAL_CORE)) {
+ if (on_device_corefile_enabled()) {
if (!kdp_has_polled_corefile()) {
if (debug_boot_arg & (DB_KERN_DUMP_ON_PANIC | DB_KERN_DUMP_ON_NMI)) {
paniclog_append_noflush("skipping local kernel core because core file could not be opened prior to panic (error : 0x%x)",
kdp_polled_corefile_error());
-#if CONFIG_EMBEDDED
+#if defined(__arm__) || defined(__arm64__)
panic_info->eph_panic_flags |= EMBEDDED_PANIC_HEADER_FLAG_COREDUMP_FAILED;
paniclog_flush();
-#else /* CONFIG_EMBEDDED */
+#else /* defined(__arm__) || defined(__arm64__) */
if (panic_info->mph_panic_log_offset != 0) {
panic_info->mph_panic_flags |= MACOS_PANIC_HEADER_FLAG_COREDUMP_FAILED;
paniclog_flush();
}
-#endif /* CONFIG_EMBEDDED */
+#endif /* defined(__arm__) || defined(__arm64__) */
}
- } else {
+ }
+#if XNU_MONITOR
+ else if ((pmap_get_cpu_data()->ppl_state == PPL_STATE_PANIC) && (debug_boot_arg & (DB_KERN_DUMP_ON_PANIC | DB_KERN_DUMP_ON_NMI))) {
+ paniclog_append_noflush("skipping local kernel core because the PPL is in PANIC state");
+ panic_info->eph_panic_flags |= EMBEDDED_PANIC_HEADER_FLAG_COREDUMP_FAILED;
+ paniclog_flush();
+ }
+#endif /* XNU_MONITOR */
+ else {
int ret = -1;
#if defined (__x86_64__)
*/
if ((debug_boot_arg & DB_REBOOT_POST_CORE) &&
((ret == 0) || (debugger_panic_options & DEBUGGER_OPTION_ATTEMPTCOREDUMPANDREBOOT))) {
- kdp_machine_reboot_type(kPEPanicRestartCPU);
+ kdp_machine_reboot_type(kPEPanicRestartCPU, debugger_panic_options);
}
}
}
if (debug_boot_arg & DB_REBOOT_ALWAYS) {
- kdp_machine_reboot_type(kPEPanicRestartCPU);
+ kdp_machine_reboot_type(kPEPanicRestartCPU, debugger_panic_options);
}
/* If KDP is configured, try to trap to the debugger */
+#if defined(__arm__) || defined(__arm64__)
+ if (kdp_explicitly_requested && (current_debugger != NO_CUR_DB)) {
+#else
if (current_debugger != NO_CUR_DB) {
+#endif
kdp_raise_exception(exception, code, subcode, state);
/*
* Only return if we entered via Debugger and it's safe to return
}
}
-#if CONFIG_EMBEDDED
- if (panicDebugging) {
- /* If panic debugging is configured, spin for astris to connect */
+#if defined(__arm__) || defined(__arm64__)
+ if (PE_i_can_has_debugger(NULL) && panicDebugging) {
+ /* If panic debugging is configured and we're on a dev fused device, spin for astris to connect */
panic_spin_shmcon();
}
-#endif /* CONFIG_EMBEDDED */
+#endif /* defined(__arm__) || defined(__arm64__) */
#endif /* CONFIG_KDP_INTERACTIVE_DEBUGGING */
if (!panicDebugging) {
- kdp_machine_reboot_type(kPEPanicRestartCPU);
+ kdp_machine_reboot_type(kPEPanicRestartCPU, debugger_panic_options);
}
panic_spin_forever();
/* Update the global panic/debugger nested entry level */
kernel_debugger_entry_count = CPUDEBUGGERCOUNT;
+ if (kernel_debugger_entry_count > 0) {
+ console_suspend();
+ }
/*
* TODO: Should we do anything special for nested panics here? i.e. if we've trapped more than twice
}
#endif /* defined (__x86_64__) */
-extern void *proc_name_address(void *p);
+extern char *proc_name_address(void *);
+extern char *proc_longname_address(void *);
-static void
+__private_extern__ void
panic_display_process_name(void)
{
- /* because of scoping issues len(p_comm) from proc_t is hard coded here */
- char proc_name[17] = "Unknown";
+ proc_name_t proc_name = {};
task_t ctask = 0;
void *cbsd_info = 0;
+ vm_size_t size;
- if (ml_nofault_copy((vm_offset_t)¤t_thread()->task, (vm_offset_t) &ctask, sizeof(task_t)) == sizeof(task_t)) {
- if (ml_nofault_copy((vm_offset_t)&ctask->bsd_info, (vm_offset_t)&cbsd_info, sizeof(cbsd_info)) == sizeof(cbsd_info)) {
- if (cbsd_info && (ml_nofault_copy((vm_offset_t) proc_name_address(cbsd_info), (vm_offset_t) &proc_name, sizeof(proc_name)) > 0)) {
- proc_name[sizeof(proc_name) - 1] = '\0';
- }
+ size = ml_nofault_copy((vm_offset_t)¤t_thread()->task,
+ (vm_offset_t)&ctask, sizeof(task_t));
+ if (size != sizeof(task_t)) {
+ goto out;
+ }
+
+ size = ml_nofault_copy((vm_offset_t)&ctask->bsd_info,
+ (vm_offset_t)&cbsd_info, sizeof(cbsd_info));
+ if (size != sizeof(cbsd_info)) {
+ goto out;
+ }
+
+ if (cbsd_info == NULL) {
+ goto out;
+ }
+
+ size = ml_nofault_copy((vm_offset_t)proc_longname_address(cbsd_info),
+ (vm_offset_t)&proc_name, sizeof(proc_name));
+
+ if (size == 0 || proc_name[0] == '\0') {
+ size = ml_nofault_copy((vm_offset_t)proc_name_address(cbsd_info),
+ (vm_offset_t)&proc_name,
+ MIN(sizeof(command_t), sizeof(proc_name)));
+ if (size > 0) {
+ proc_name[size - 1] = '\0';
}
}
- paniclog_append_noflush("\nBSD process name corresponding to current thread: %s\n", proc_name);
+
+out:
+ proc_name[sizeof(proc_name) - 1] = '\0';
+ paniclog_append_noflush("\nProcess name corresponding to current thread: %s\n",
+ proc_name[0] != '\0' ? proc_name : "Unknown");
}
unsigned
void
panic_display_kernel_aslr(void)
{
- if (vm_kernel_slide) {
- paniclog_append_noflush("Kernel slide: 0x%016lx\n", (unsigned long) vm_kernel_slide);
- paniclog_append_noflush("Kernel text base: %p\n", (void *) vm_kernel_stext);
+ kc_format_t kc_format;
+
+ PE_get_primary_kc_format(&kc_format);
+
+ if (kc_format == KCFormatFileset) {
+ void *kch = PE_get_kc_header(KCKindPrimary);
+
+ paniclog_append_noflush("KernelCache slide: 0x%016lx\n", (unsigned long) vm_kernel_slide);
+ paniclog_append_noflush("KernelCache base: %p\n", (void*) kch);
+ paniclog_append_noflush("Kernel slide: 0x%016lx\n", vm_kernel_stext - (unsigned long)kch + vm_kernel_slide);
+ } else if (vm_kernel_slide) {
+ paniclog_append_noflush("Kernel slide: 0x%016lx\n", (unsigned long) vm_kernel_slide);
+ }
+ paniclog_append_noflush("Kernel text base: %p\n", (void *) vm_kernel_stext);
+#if defined(__arm64__)
+ if (kc_format == KCFormatFileset) {
+ extern vm_offset_t segTEXTEXECB;
+ paniclog_append_noflush("Kernel text exec base: 0x%016lx\n", (unsigned long)segTEXTEXECB);
}
+#endif
}
void
#endif
}
-static void
-panic_display_uptime(void)
-{
- uint64_t uptime;
- absolutetime_to_nanoseconds(mach_absolute_time(), &uptime);
-
- paniclog_append_noflush("\nSystem uptime in nanoseconds: %llu\n", uptime);
-}
-
-static void
-panic_display_disk_errors(void)
-{
- if (panic_disk_error_description[0]) {
- panic_disk_error_description[sizeof(panic_disk_error_description) - 1] = '\0';
- paniclog_append_noflush("Root disk errors: \"%s\"\n", panic_disk_error_description);
- }
-};
-
-extern const char version[];
-extern char osversion[];
-
-static volatile uint32_t config_displayed = 0;
-
-__private_extern__ void
-panic_display_system_configuration(boolean_t launchd_exit)
-{
- if (!launchd_exit) {
- panic_display_process_name();
- }
- if (OSCompareAndSwap(0, 1, &config_displayed)) {
- char buf[256];
- if (!launchd_exit && strlcpy(buf, PE_boot_args(), sizeof(buf))) {
- paniclog_append_noflush("Boot args: %s\n", buf);
- }
- paniclog_append_noflush("\nMac OS version:\n%s\n",
- (osversion[0] != 0) ? osversion : "Not yet set");
- paniclog_append_noflush("\nKernel version:\n%s\n", version);
- panic_display_kernel_uuid();
- if (!launchd_exit) {
- panic_display_kernel_aslr();
- panic_display_hibb();
- panic_display_pal_info();
- }
- panic_display_model_name();
- panic_display_disk_errors();
- if (!launchd_exit) {
- panic_display_uptime();
- panic_display_zprint();
-#if CONFIG_ZLEAKS
- panic_display_ztrace();
-#endif /* CONFIG_ZLEAKS */
- kext_dump_panic_lists(&paniclog_append_noflush);
- }
- }
-}
-
extern unsigned int stack_total;
extern unsigned long long stack_allocs;
extern vm_size_t panic_kext_memory_size;
__private_extern__ void
-panic_display_zprint()
+panic_display_zprint(void)
{
if (panic_include_zprint == TRUE) {
- unsigned int i;
struct zone zone_copy;
paniclog_append_noflush("%-20s %10s %10s\n", "Zone Name", "Cur Size", "Free Size");
- for (i = 0; i < num_zones; i++) {
- if (ml_nofault_copy((vm_offset_t)(&zone_array[i]), (vm_offset_t)&zone_copy, sizeof(struct zone)) == sizeof(struct zone)) {
- if (zone_copy.cur_size > (1024 * 1024)) {
- paniclog_append_noflush("%-20s %10lu %10lu\n", zone_copy.zone_name, (uintptr_t)zone_copy.cur_size, (uintptr_t)(zone_copy.countfree * zone_copy.elem_size));
+ zone_index_foreach(i) {
+ if (ml_nofault_copy((vm_offset_t)&zone_array[i],
+ (vm_offset_t)&zone_copy, sizeof(struct zone)) == sizeof(struct zone)) {
+ if (zone_copy.page_count > atop(1024 * 1024)) {
+ paniclog_append_noflush("%-8s%-20s %10llu %10lu\n",
+ zone_heap_name(&zone_copy),
+ zone_copy.z_name, ptoa_64(zone_copy.page_count),
+ (uintptr_t)zone_size_free(&zone_copy));
}
}
}
- paniclog_append_noflush("%-20s %10lu\n", "Kernel Stacks", (uintptr_t)(kernel_stack_size * stack_total));
-
+ paniclog_append_noflush("%-20s %10lu\n", "Kernel Stacks",
+ (uintptr_t)(kernel_stack_size * stack_total));
#if defined (__x86_64__)
- paniclog_append_noflush("%-20s %10lu\n", "PageTables", (uintptr_t)(PAGE_SIZE * inuse_ptepages_count));
+ paniclog_append_noflush("%-20s %10lu\n", "PageTables",
+ (uintptr_t)ptoa(inuse_ptepages_count));
#endif
+ paniclog_append_noflush("%-20s %10lu\n", "Kalloc.Large",
+ (uintptr_t)kalloc_large_total);
- paniclog_append_noflush("%-20s %10lu\n", "Kalloc.Large", (uintptr_t)kalloc_large_total);
if (panic_kext_memory_info) {
mach_memory_info_t *mem_info = panic_kext_memory_info;
paniclog_append_noflush("\n%-5s %10s\n", "Kmod", "Size");
- for (i = 0; i < (panic_kext_memory_size / sizeof(mach_zone_info_t)); i++) {
- if (((mem_info[i].flags & VM_KERN_SITE_TYPE) == VM_KERN_SITE_KMOD) && (mem_info[i].size > (1024 * 1024))) {
+ for (uint32_t i = 0; i < (panic_kext_memory_size / sizeof(mach_zone_info_t)); i++) {
+ if (((mem_info[i].flags & VM_KERN_SITE_TYPE) == VM_KERN_SITE_KMOD) &&
+ (mem_info[i].size > (1024 * 1024))) {
paniclog_append_noflush("%-5lld %10lld\n", mem_info[i].site, mem_info[i].size);
}
}
#if CONFIG_ECC_LOGGING
__private_extern__ void
-panic_display_ecc_errors()
+panic_display_ecc_errors(void)
{
uint32_t count = ecc_log_get_correction_count();
{
if (kern_feature_overrides == 0) {
uint32_t fdisables = 0;
- /* Expected to be first invoked early, in a single-threaded
+ /*
+ * Expected to be first invoked early, in a single-threaded
* environment
*/
if (PE_parse_boot_argn("validation_disables", &fdisables, sizeof(fdisables))) {
}
return (kern_feature_overrides & fmask) == fmask;
}
+
+boolean_t
+on_device_corefile_enabled(void)
+{
+ assert(startup_phase >= STARTUP_SUB_TUNABLES);
+#if CONFIG_KDP_INTERACTIVE_DEBUGGING
+ if (debug_boot_arg == 0) {
+ return FALSE;
+ }
+ if (debug_boot_arg & DB_DISABLE_LOCAL_CORE) {
+ return FALSE;
+ }
+#if !XNU_TARGET_OS_OSX
+ /*
+ * outside of macOS, if there's a debug boot-arg set and local
+ * cores aren't explicitly disabled, we always write a corefile.
+ */
+ return TRUE;
+#else /* !XNU_TARGET_OS_OSX */
+ /*
+ * on macOS, if corefiles on panic are requested and local cores
+ * aren't disabled we write a local core.
+ */
+ if (debug_boot_arg & (DB_KERN_DUMP_ON_NMI | DB_KERN_DUMP_ON_PANIC)) {
+ return TRUE;
+ }
+#endif /* !XNU_TARGET_OS_OSX */
+#endif /* CONFIG_KDP_INTERACTIVE_DEBUGGING */
+ return FALSE;
+}
+
+boolean_t
+panic_stackshot_to_disk_enabled(void)
+{
+ assert(startup_phase >= STARTUP_SUB_TUNABLES);
+#if defined(__x86_64__)
+ if (PEGetCoprocessorVersion() < kCoprocessorVersion2) {
+ /* Only enabled on pre-Gibraltar machines where it hasn't been disabled explicitly */
+ if ((debug_boot_arg != 0) && (debug_boot_arg & DB_DISABLE_STACKSHOT_TO_DISK)) {
+ return FALSE;
+ }
+
+ return TRUE;
+ }
+#endif
+ return FALSE;
+}
+
+#if DEBUG || DEVELOPMENT
+const char *
+sysctl_debug_get_preoslog(size_t *size)
+{
+ int result = 0;
+ void *preoslog_pa = NULL;
+ int preoslog_size = 0;
+
+ result = IODTGetLoaderInfo("preoslog", &preoslog_pa, &preoslog_size);
+ if (result || preoslog_pa == NULL || preoslog_size == 0) {
+ kprintf("Couldn't obtain preoslog region: result = %d, preoslog_pa = %p, preoslog_size = %d\n", result, preoslog_pa, preoslog_size);
+ *size = 0;
+ return NULL;
+ }
+
+ /*
+ * Beware:
+ * On release builds, we would need to call IODTFreeLoaderInfo("preoslog", preoslog_pa, preoslog_size) to free the preoslog buffer.
+ * On Development & Debug builds, we retain the buffer so it can be extracted from coredumps.
+ */
+ *size = preoslog_size;
+ return (char *)(ml_static_ptovirt((vm_offset_t)(preoslog_pa)));
+}
+#endif /* DEBUG || DEVELOPMENT */
projects / apple / xnu.git / blobdiff