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--- /dev/null
+++ xnu/xnu-8792.61.2/libkern/gen/OSDebug.cpp
@@ -0,0 +1,258 @@
+/*
+ * Copyright (c) 2005-2012 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+// NOTE: This file is only c++ so I can get static initialisers going
+#include <libkern/OSDebug.h>
+#include <IOKit/IOLib.h>
+
+#include <sys/cdefs.h>
+
+#include <stdarg.h>
+#include <mach/mach_types.h>
+#include <mach/kmod.h>
+#include <kern/locks.h>
+
+#include <libkern/libkern.h> // From bsd's libkern directory
+#include <mach/vm_param.h>
+
+#include <sys/kdebug.h>
+#include <kern/thread.h>
+
+#if defined(HAS_APPLE_PAC)
+#include <ptrauth.h>
+#endif
+
+extern int etext;
+__BEGIN_DECLS
+// From osmfk/kern/thread.h but considered to be private
+extern vm_offset_t min_valid_stack_address(void);
+extern vm_offset_t max_valid_stack_address(void);
+
+// From osfmk/kern/printf.c
+extern boolean_t doprnt_hide_pointers;
+
+// From osfmk/kmod.c
+extern void kmod_dump_log(vm_offset_t *addr, unsigned int cnt, boolean_t doUnslide);
+
+extern addr64_t kvtophys(vm_offset_t va);
+#if __arm__
+extern int copyinframe(vm_address_t fp, char *frame);
+#elif defined(__arm64__)
+extern int copyinframe(vm_address_t fp, char *frame, boolean_t is64bit);
+#endif
+
+__END_DECLS
+
+extern lck_grp_t *IOLockGroup;
+
+static lck_mtx_t *sOSReportLock = lck_mtx_alloc_init(IOLockGroup, LCK_ATTR_NULL);
+
+/* Report a message with a 4 entry backtrace - very slow */
+void
+OSReportWithBacktrace(const char *str, ...)
+{
+ char buf[128];
+ void *bt[9] = {};
+ const unsigned cnt = sizeof(bt) / sizeof(bt[0]);
+ va_list listp;
+
+ // Ignore the our and our callers stackframes, skipping frames 0 & 1
+ (void) OSBacktrace(bt, cnt);
+
+ va_start(listp, str);
+ vsnprintf(buf, sizeof(buf), str, listp);
+ va_end(listp);
+
+ lck_mtx_lock(sOSReportLock);
+ {
+ boolean_t old_doprnt_hide_pointers = doprnt_hide_pointers;
+ doprnt_hide_pointers = FALSE;
+ printf("%s\nBacktrace 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", buf,
+ (unsigned long) VM_KERNEL_UNSLIDE(bt[2]), (unsigned long) VM_KERNEL_UNSLIDE(bt[3]),
+ (unsigned long) VM_KERNEL_UNSLIDE(bt[4]), (unsigned long) VM_KERNEL_UNSLIDE(bt[5]),
+ (unsigned long) VM_KERNEL_UNSLIDE(bt[6]), (unsigned long) VM_KERNEL_UNSLIDE(bt[7]),
+ (unsigned long) VM_KERNEL_UNSLIDE(bt[8]));
+ kmod_dump_log((vm_offset_t *) &bt[2], cnt - 2, TRUE);
+ doprnt_hide_pointers = old_doprnt_hide_pointers;
+ }
+ lck_mtx_unlock(sOSReportLock);
+}
+
+static vm_offset_t minstackaddr = min_valid_stack_address();
+static vm_offset_t maxstackaddr = max_valid_stack_address();
+
+
+#if __x86_64__
+#define x86_64_RETURN_OFFSET 8
+static unsigned int
+x86_64_validate_raddr(vm_offset_t raddr)
+{
+ return (raddr > VM_MIN_KERNEL_AND_KEXT_ADDRESS) &&
+ (raddr < VM_MAX_KERNEL_ADDRESS);
+}
+static unsigned int
+x86_64_validate_stackptr(vm_offset_t stackptr)
+{
+ /* Existence and alignment check
+ */
+ if (!stackptr || (stackptr & 0x7) || !x86_64_validate_raddr(stackptr)) {
+ return 0;
+ }
+
+ /* Is a virtual->physical translation present?
+ */
+ if (!kvtophys(stackptr)) {
+ return 0;
+ }
+
+ /* Check if the return address lies on the same page;
+ * If not, verify that a translation exists.
+ */
+ if (((PAGE_SIZE - (stackptr & PAGE_MASK)) < x86_64_RETURN_OFFSET) &&
+ !kvtophys(stackptr + x86_64_RETURN_OFFSET)) {
+ return 0;
+ }
+ return 1;
+}
+#endif
+
+void
+OSPrintBacktrace(void)
+{
+ void * btbuf[20];
+ int tmp = OSBacktrace(btbuf, 20);
+ int i;
+ for (i = 0; i < tmp; i++) {
+ kprintf("bt[%.2d] = %p\n", i, btbuf[i]);
+ }
+}
+
+unsigned
+OSBacktrace(void **bt, unsigned maxAddrs)
+{
+ unsigned frame;
+ if (!current_thread()) {
+ return 0;
+ }
+
+#if __x86_64__
+#define SANE_x86_64_FRAME_SIZE (kernel_stack_size >> 1)
+ vm_offset_t stackptr, stackptr_prev, raddr;
+ unsigned frame_index = 0;
+/* Obtain current frame pointer */
+
+ __asm__ volatile ("movq %%rbp, %0" : "=m" (stackptr));
+
+ if (!x86_64_validate_stackptr(stackptr)) {
+ goto pad;
+ }
+
+ raddr = *((vm_offset_t *) (stackptr + x86_64_RETURN_OFFSET));
+
+ if (!x86_64_validate_raddr(raddr)) {
+ goto pad;
+ }
+
+ bt[frame_index++] = (void *) raddr;
+
+ for (; frame_index < maxAddrs; frame_index++) {
+ stackptr_prev = stackptr;
+ stackptr = *((vm_offset_t *) stackptr_prev);
+
+ if (!x86_64_validate_stackptr(stackptr)) {
+ break;
+ }
+ /* Stack grows downwards */
+ if (stackptr < stackptr_prev) {
+ break;
+ }
+
+ if ((stackptr - stackptr_prev) > SANE_x86_64_FRAME_SIZE) {
+ break;
+ }
+
+ raddr = *((vm_offset_t *) (stackptr + x86_64_RETURN_OFFSET));
+
+ if (!x86_64_validate_raddr(raddr)) {
+ break;
+ }
+
+ bt[frame_index] = (void *) raddr;
+ }
+pad:
+ frame = frame_index;
+
+ for (; frame_index < maxAddrs; frame_index++) {
+ bt[frame_index] = (void *) NULL;
+ }
+#elif __arm__ || __arm64__
+ uint32_t i = 0;
+ uintptr_t frameb[2];
+ uintptr_t fp = 0;
+
+ // get the current frame pointer for this thread
+#if defined(__arm__)
+#define OSBacktraceFrameAlignOK(x) (((x) & 0x3) == 0)
+ __asm__ volatile ("mov %0,r7" : "=r" (fp));
+#elif defined(__arm64__)
+#define OSBacktraceFrameAlignOK(x) (((x) & 0xf) == 0)
+ __asm__ volatile ("mov %0, fp" : "=r" (fp));
+#else
+#error Unknown architecture.
+#endif
+
+ // now crawl up the stack recording the link value of each frame
+ do {
+ // check bounds
+ if ((fp == 0) || (!OSBacktraceFrameAlignOK(fp)) || (fp > VM_MAX_KERNEL_ADDRESS) || (fp < VM_MIN_KERNEL_AND_KEXT_ADDRESS)) {
+ break;
+ }
+ // safely read frame
+#ifdef __arm64__
+ if (copyinframe(fp, (char*)frameb, TRUE) != 0) {
+#else
+ if (copyinframe(fp, (char*)frameb) != 0) {
+#endif
+ break;
+ }
+
+ // No need to use copyin as this is always a kernel address, see check above
+#if defined(HAS_APPLE_PAC)
+ /* return addresses on stack signed by arm64e ABI */
+ bt[i] = ptrauth_strip((void*)frameb[1], ptrauth_key_return_address); // link register
+#else
+ bt[i] = (void*)frameb[1]; // link register
+#endif
+ fp = frameb[0];
+ } while (++i < maxAddrs);
+ frame = i;
+#else
+#error arch
+#endif
+ return frame;
+}