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--- xnu/xnu-1504.7.4/libkern/gen/OSDebug.cpp
+++ xnu/xnu-4570.41.2/libkern/gen/OSDebug.cpp
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2005-2012 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
@@ -28,6 +28,7 @@
// 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>
@@ -48,10 +49,18 @@
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);
+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
@@ -92,7 +101,7 @@
OSReportWithBacktrace(const char *str, ...)
{
char buf[128];
- void *bt[9];
+ void *bt[9] = {};
const unsigned cnt = sizeof(bt) / sizeof(bt[0]);
va_list listp;
@@ -105,9 +114,15 @@
lck_mtx_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);
+ 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);
}
@@ -115,15 +130,21 @@
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
-
+
+#if __x86_64__
+#define x86_64_RETURN_OFFSET 8
static unsigned int
-i386_validate_stackptr(vm_offset_t stackptr)
+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 & 0x3))
+ if (!stackptr || (stackptr & 0x7) || !x86_64_validate_raddr(stackptr))
return 0;
/* Is a virtual->physical translation present?
@@ -134,44 +155,6 @@
/* 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;
@@ -179,53 +162,37 @@
}
#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 __ppc__
- vm_offset_t stackptr, stackptr_prev;
- const vm_offset_t * const mem = (vm_offset_t *) 0;
- unsigned i = 0;
-
- __asm__ volatile("mflr %0" : "=r" (stackptr));
- bt[i++] = (void *) stackptr;
-
- __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 - stackptr_prev) > 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 __i386__
-#define SANE_i386_FRAME_SIZE (kernel_stack_size >> 1)
+ 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("movl %%ebp, %0" : "=m" (stackptr));
-
- if (!i386_validate_stackptr(stackptr))
+
+ __asm__ volatile("movq %%rbp, %0" : "=m" (stackptr));
+
+ if (!x86_64_validate_stackptr(stackptr))
goto pad;
- raddr = *((vm_offset_t *) (stackptr + i386_RETURN_OFFSET));
-
- if (!i386_validate_raddr(raddr))
+ raddr = *((vm_offset_t *) (stackptr + x86_64_RETURN_OFFSET));
+
+ if (!x86_64_validate_raddr(raddr))
goto pad;
bt[frame_index++] = (void *) raddr;
@@ -234,18 +201,18 @@
stackptr_prev = stackptr;
stackptr = *((vm_offset_t *) stackptr_prev);
- if (!i386_validate_stackptr(stackptr))
+ if (!x86_64_validate_stackptr(stackptr))
break;
/* Stack grows downwards */
if (stackptr < stackptr_prev)
break;
- if ((stackptr - stackptr_prev) > SANE_i386_FRAME_SIZE)
- break;
-
- raddr = *((vm_offset_t *) (stackptr + i386_RETURN_OFFSET));
-
- if (!i386_validate_raddr(raddr))
+ 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;
@@ -255,52 +222,44 @@
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;
+#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
+ bt[i] = (void*)frameb[1]; // link register
+ fp = frameb[0];
+ } while (++i < maxAddrs);
+ frame= i;
#else
#error arch
#endif
return frame;
}
-