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--- xnu/xnu-12377.101.15/libkern/gen/OSDebug.cpp
+++ xnu/xnu-792.6.56/libkern/gen/OSDebug.cpp
@@ -1,20 +1,15 @@
/*
- * Copyright (c) 2005-2012 Apple Inc. All rights reserved.
+ * Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ * @APPLE_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.
- *
+ * compliance with the License. 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,
@@ -22,240 +17,155 @@
* 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@
+ *
+ * @APPLE_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 <kern/lock.h>
-#include <libkern/libkern.h> // From bsd's libkern directory
-#include <mach/vm_param.h>
+#include <libkern/libkern.h> // From bsd's libkern directory
-#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
-
+extern void kmod_dump_log(vm_offset_t *addr, unsigned int cnt);
__END_DECLS
-extern lck_grp_t * IOLockGroup;
-
-static lck_mtx_t *sOSReportLock = lck_mtx_alloc_init(IOLockGroup, LCK_ATTR_NULL);
+static mutex_t *sOSReportLock = mutex_alloc(0);
/* 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;
+ 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);
+ // 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);
+ 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);
+ mutex_lock(sOSReportLock);
+ {
+ printf("%s\nBacktrace %p %p %p %p %p %p %p\n",
+ buf, bt[2], bt[3], bt[4], bt[5], bt[6], bt[7], bt[8]);
+ kmod_dump_log((vm_offset_t *) &bt[2], cnt - 2);
+ }
+ mutex_unlock(sOSReportLock);
}
static vm_offset_t minstackaddr = min_valid_stack_address();
static vm_offset_t maxstackaddr = max_valid_stack_address();
+unsigned OSBacktrace(void **bt, unsigned maxAddrs)
+{
+ unsigned frame;
-#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;
- }
+#if __ppc__
+ vm_offset_t stackptr, stackptr_prev;
+ const vm_offset_t * const mem = (vm_offset_t *) 0;
+ unsigned i = 0;
- /* Is a virtual->physical translation present?
- */
- if (!kvtophys(stackptr)) {
- return 0;
- }
+ __asm__ volatile("mflr %0" : "=r" (stackptr));
+ bt[i++] = (void *) stackptr;
- /* 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;
-}
+ __asm__ volatile("mr %0,r1" : "=r" (stackptr));
+ for ( ; i < maxAddrs; i++) {
+ // Validate we have a reasonable stackptr
+ if ( !(minstackaddr <= stackptr && stackptr < maxstackaddr)
+ || (stackptr & 3))
+ break;
+
+ stackptr_prev = stackptr;
+ stackptr = mem[stackptr_prev >> 2];
+ if ((stackptr_prev ^ stackptr) > 8 * 1024) // Sanity check
+ break;
+
+ vm_offset_t addr = mem[(stackptr >> 2) + 2];
+ if ((addr & 3) || (addr < 0x8000)) // More sanity checks
+ break;
+ bt[i] = (void *) addr;
+ }
+ frame = i;
+
+ for ( ; i < maxAddrs; i++)
+ bt[i] = (void *) 0;
+#elif 0 && __i386__ // Note that this should be ported for i386
+ // This function is not safe, we should get this code ported appropriately
+ if (maxAddrs > 16) {
+ for (frame = 16; frame < maxAddrs; frame++)
+ bt[frame] = __builtin_return_address(frame);
+ maxAddrs = 16;
+ }
+
+ switch(maxAddrs) {
+ case 15+1: bt[15] = __builtin_return_address(15);
+ case 14+1: bt[14] = __builtin_return_address(14);
+ case 13+1: bt[13] = __builtin_return_address(13);
+ case 12+1: bt[12] = __builtin_return_address(12);
+ case 11+1: bt[11] = __builtin_return_address(11);
+ case 10+1: bt[10] = __builtin_return_address(10);
+ case 9+1: bt[ 9] = __builtin_return_address( 9);
+ case 8+1: bt[ 8] = __builtin_return_address( 8);
+ case 7+1: bt[ 7] = __builtin_return_address( 7);
+ case 6+1: bt[ 6] = __builtin_return_address( 6);
+ case 5+1: bt[ 5] = __builtin_return_address( 5);
+ case 4+1: bt[ 4] = __builtin_return_address( 4);
+ case 3+1: bt[ 3] = __builtin_return_address( 3);
+ case 2+1: bt[ 2] = __builtin_return_address( 2);
+ case 1+1: bt[ 1] = __builtin_return_address( 1);
+ case 0+1: bt[ 0] = __builtin_return_address( 0);
+ case 0: default: break;
+ }
+
+ frame = maxAddrs;
+#else
+ // This function is not safe, we should get this code ported appropriately
+ if (maxAddrs > 16) {
+ for (frame = 16; frame < maxAddrs; frame++)
+ bt[frame] = 0;
+ maxAddrs = 16;
+ }
+
+ switch (maxAddrs) {
+ case 15+1: bt[15] = __builtin_return_address(15);
+ case 14+1: bt[14] = __builtin_return_address(14);
+ case 13+1: bt[13] = __builtin_return_address(13);
+ case 12+1: bt[12] = __builtin_return_address(12);
+ case 11+1: bt[11] = __builtin_return_address(11);
+ case 10+1: bt[10] = __builtin_return_address(10);
+ case 9+1: bt[ 9] = __builtin_return_address( 9);
+ case 8+1: bt[ 8] = __builtin_return_address( 8);
+ case 7+1: bt[ 7] = __builtin_return_address( 7);
+ case 6+1: bt[ 6] = __builtin_return_address( 6);
+ case 5+1: bt[ 5] = __builtin_return_address( 5);
+ case 4+1: bt[ 4] = __builtin_return_address( 4);
+ case 3+1: bt[ 3] = __builtin_return_address( 3);
+ case 2+1: bt[ 2] = __builtin_return_address( 2);
+ case 1+1: bt[ 1] = __builtin_return_address( 1);
+ case 0+1: bt[ 0] = __builtin_return_address( 0);
+ case 0:
+ default :
+ break;
+ }
+
+ frame = maxAddrs;
#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]);
- }
+ return frame;
}
-
-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];
-#if defined(HAS_APPLE_PAC)
- fp = (uintptr_t)ptrauth_strip((void *)fp, ptrauth_key_frame_pointer);
-#endif
- } while (++i < maxAddrs);
- frame = i;
-#else
-#error arch
-#endif
- return frame;
-}