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--- xnu/xnu-2050.9.2/libkern/gen/OSDebug.cpp
+++ xnu/xnu-792.2.4/libkern/gen/OSDebug.cpp
@@ -1,49 +1,37 @@
/*
* 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
#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 <sys/kdebug.h>
-#include <kern/thread.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);
@@ -51,42 +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);
-
__END_DECLS
-extern lck_grp_t *IOLockGroup;
-
-static lck_mtx_t *sOSReportLock = lck_mtx_alloc_init(IOLockGroup, LCK_ATTR_NULL);
-
-/* Use kernel_debug() to log a backtrace */
-void
-trace_backtrace(uint32_t debugid, uint32_t debugid2, uintptr_t size, uintptr_t 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) (uintptr_t)(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);
-}
+static mutex_t *sOSReportLock = mutex_alloc(0);
/* Report a message with a 4 entry backtrace - very slow */
void
@@ -104,185 +59,112 @@
vsnprintf(buf, sizeof(buf), str, listp);
va_end(listp);
- lck_mtx_lock(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);
+ 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);
}
- lck_mtx_unlock(sOSReportLock);
+ mutex_unlock(sOSReportLock);
}
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_AND_KEXT_ADDRESS) &&
- (raddr < VM_MAX_KERNEL_ADDRESS));
-}
-#endif
-
-#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 __i386__
-#define SANE_i386_FRAME_SIZE (kernel_stack_size >> 1)
- vm_offset_t stackptr, stackptr_prev, raddr;
- unsigned frame_index = 0;
-/* Obtain current frame pointer */
- __asm__ volatile("movl %%ebp, %0" : "=m" (stackptr));
+#if __ppc__
+ vm_offset_t stackptr, stackptr_prev;
+ const vm_offset_t * const mem = (vm_offset_t *) 0;
+ unsigned i = 0;
- if (!i386_validate_stackptr(stackptr))
- goto pad;
+ __asm__ volatile("mflr %0" : "=r" (stackptr));
+ bt[i++] = (void *) stackptr;
- raddr = *((vm_offset_t *) (stackptr + i386_RETURN_OFFSET));
+ __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;
- if (!i386_validate_raddr(raddr))
- goto pad;
+ stackptr_prev = stackptr;
+ stackptr = mem[stackptr_prev >> 2];
+ if ((stackptr_prev ^ stackptr) > 8 * 1024) // Sanity check
+ break;
- bt[frame_index++] = (void *) raddr;
+ vm_offset_t addr = mem[(stackptr >> 2) + 2];
+ if ((addr & 3) || (addr < 0x8000)) // More sanity checks
+ break;
+ bt[i] = (void *) addr;
+ }
+ frame = i;
- for ( ; frame_index < maxAddrs; frame_index++) {
- stackptr_prev = stackptr;
- stackptr = *((vm_offset_t *) stackptr_prev);
+ 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;
+ }
- if (!i386_validate_stackptr(stackptr))
- break;
- /* Stack grows downwards */
- if (stackptr < stackptr_prev)
- break;
+ 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;
+ }
- if ((stackptr - stackptr_prev) > SANE_i386_FRAME_SIZE)
- 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;
+ }
- raddr = *((vm_offset_t *) (stackptr + i386_RETURN_OFFSET));
+ 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;
+ }
- if (!i386_validate_raddr(raddr))
- break;
+ frame = maxAddrs;
+#endif
- bt[frame_index] = (void *) raddr;
- }
-pad:
- frame = frame_index;
-
- for ( ; frame_index < maxAddrs; frame_index++)
- bt[frame_index] = (void *) 0;
-#elif __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 *) 0;
-#else
-#error arch
-#endif
return frame;
}