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--- xnu/xnu-1228/libkern/gen/OSDebug.cpp
+++ xnu/xnu-792.6.70/libkern/gen/OSDebug.cpp
@@ -1,29 +1,23 @@
/*
* 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.
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License"). You may not use this file except in compliance with the
+ * License. Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
*
- * 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
+ * This 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.
+ * FITNESS FOR A PARTICULAR PURPOSE 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
@@ -37,10 +31,7 @@
#include <kern/lock.h>
#include <libkern/libkern.h> // From bsd's libkern directory
-#include <mach/vm_param.h>
-#include <sys/kdebug.h>
-extern int etext;
__BEGIN_DECLS
// From osmfk/kern/thread.h but considered to be private
extern vm_offset_t min_valid_stack_address(void);
@@ -48,43 +39,9 @@
// From osfmk/kmod.c
extern void kmod_dump_log(vm_offset_t *addr, unsigned int cnt);
-
-extern addr64_t kvtophys(vm_offset_t va);
-#if __arm__
-extern int copyinframe(vm_address_t fp, uint32_t *frame);
-#endif
-
__END_DECLS
static mutex_t *sOSReportLock = mutex_alloc(0);
-
-/* Use kernel_debug() to log a backtrace */
-void
-trace_backtrace(unsigned int debugid, unsigned int debugid2, int size, int data) {
- void *bt[16];
- const unsigned cnt = sizeof(bt) / sizeof(bt[0]);
- unsigned i;
- int found = 0;
-
- OSBacktrace(bt, cnt);
-
- /* find first non-kernel frame */
- for (i = 3; i < cnt && bt[i]; i++) {
- if (bt[i] > (void*)&etext) {
- found = 1;
- break;
- }
- }
- /*
- * if there are non-kernel frames, only log these
- * otherwise, log everything but the first two
- */
- if (!found) i=2;
-
-#define safe_bt(a) (int)(a<cnt ? bt[a] : 0)
- kernel_debug(debugid, data, size, safe_bt(i), safe_bt(i+1), 0);
- kernel_debug(debugid2, safe_bt(i+2), safe_bt(i+3), safe_bt(i+4), safe_bt(i+5), 0);
-}
/* Report a message with a 4 entry backtrace - very slow */
void
@@ -113,39 +70,6 @@
static vm_offset_t minstackaddr = min_valid_stack_address();
static vm_offset_t maxstackaddr = max_valid_stack_address();
-
-#if __i386__
-#define i386_RETURN_OFFSET 4
-
-static unsigned int
-i386_validate_stackptr(vm_offset_t stackptr)
-{
- /* Existence and alignment check
- */
- if (!stackptr || (stackptr & 0x3))
- 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)) < i386_RETURN_OFFSET) &&
- !kvtophys(stackptr + i386_RETURN_OFFSET))
- return 0;
- return 1;
-}
-
-static unsigned int
-i386_validate_raddr(vm_offset_t raddr)
-{
- return ((raddr > VM_MIN_KERNEL_ADDRESS) &&
- (raddr < VM_MAX_KERNEL_ADDRESS));
-}
-#endif
unsigned OSBacktrace(void **bt, unsigned maxAddrs)
{
@@ -180,74 +104,67 @@
for ( ; i < maxAddrs; i++)
bt[i] = (void *) 0;
-#elif __i386__
-#define SANE_i386_FRAME_SIZE 8*1024
- vm_offset_t stackptr, stackptr_prev, raddr;
- unsigned frame_index = 0;
-/* Obtain current frame pointer */
- __asm__ volatile("movl %%ebp, %0" : "=m" (stackptr));
+#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;
+ }
- if (!i386_validate_stackptr(stackptr))
- goto pad;
+ 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;
+ }
- raddr = *((vm_offset_t *) (stackptr + i386_RETURN_OFFSET));
+ 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;
+ }
- if (!i386_validate_raddr(raddr))
- goto pad;
+ 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;
+ }
- bt[frame_index++] = (void *) raddr;
+ frame = maxAddrs;
+#endif
- for ( ; frame_index < maxAddrs; frame_index++) {
- stackptr_prev = stackptr;
- stackptr = *((vm_offset_t *) stackptr_prev);
-
- if (!i386_validate_stackptr(stackptr))
- break;
- /* Stack grows downwards */
- if (stackptr < stackptr_prev)
- break;
-
- if ((stackptr_prev ^ stackptr) > SANE_i386_FRAME_SIZE)
- break;
-
- raddr = *((vm_offset_t *) (stackptr + i386_RETURN_OFFSET));
-
- if (!i386_validate_raddr(raddr))
- break;
-
- bt[frame_index] = (void *) raddr;
- }
-pad:
- frame = frame_index;
-
- for ( ; frame_index < maxAddrs; frame_index++)
- bt[frame_index] = (void *) 0;
-#elif __arm__
- uint32_t i= 0;
- uint32_t frameb[2];
- uint32_t fp= 0;
-
- // get the current frame pointer for this thread
- __asm__ volatile("mov %0,r7" : "=r" (fp));
-
- // now crawl up the stack recording the link value of each frame
- do {
- // check bounds
- if ((fp == 0) || ((fp & 3) != 0) || (fp > VM_MAX_KERNEL_ADDRESS) || (fp < VM_MIN_KERNEL_ADDRESS)) {
- break;
- }
- // safely read frame
- if (copyinframe(fp, frameb) != 0) {
- break;
- }
-
- // No need to use copyin as this is always a kernel address, see check above
- bt[i] = (void*)frameb[1]; // link register
- fp = frameb[0];
- } while (++i < maxAddrs);
- frame= i;
-#else
-#error arch
-#endif
return frame;
}