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--- xnu/xnu-12377.101.15/libkern/gen/OSDebug.cpp
+++ xnu/xnu-1699.32.7/libkern/gen/OSDebug.cpp
@@ -1,8 +1,8 @@
/*
- * Copyright (c) 2005-2012 Apple Inc. All rights reserved.
+ * Copyright (c) 2005 Apple Computer, 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
@@ -11,10 +11,10 @@
* 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,
@@ -22,7 +22,7 @@
* 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@
*/
@@ -37,15 +37,11 @@
#include <mach/kmod.h>
#include <kern/locks.h>
-#include <libkern/libkern.h> // From bsd's libkern directory
+#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
@@ -53,90 +49,133 @@
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 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, 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;
+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);
+}
/* 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);
+ 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);
+ {
+ 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);
}
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);
+ 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 (!stackptr || (stackptr & 0x7) || !x86_64_validate_raddr(stackptr))
+ return 0;
+
/* Is a virtual->physical translation present?
*/
- if (!kvtophys(stackptr)) {
- return 0;
- }
-
+ 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;
- }
+ !kvtophys(stackptr + x86_64_RETURN_OFFSET))
+ return 0;
return 1;
}
#endif
@@ -147,115 +186,104 @@
void * btbuf[20];
int tmp = OSBacktrace(btbuf, 20);
int i;
- for (i = 0; i < tmp; 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__
+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 (!i386_validate_stackptr(stackptr))
+ goto pad;
+
+ raddr = *((vm_offset_t *) (stackptr + i386_RETURN_OFFSET));
+
+ if (!i386_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 (!i386_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))
+ break;
+
+ 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;
+ 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;
- }
+ __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;
+ frame = frame_index;
+
+ for ( ; frame_index < maxAddrs; frame_index++)
+ bt[frame_index] = (void *) 0;
#else
#error arch
#endif
- return frame;
-}
+ return frame;
+}
+