// 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/lock.h>
+#include <kern/locks.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);
extern void kmod_dump_log(vm_offset_t *addr, unsigned int cnt);
extern addr64_t kvtophys(vm_offset_t va);
+
__END_DECLS
-static mutex_t *sOSReportLock = mutex_alloc(0);
+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
vsnprintf(buf, sizeof(buf), str, listp);
va_end(listp);
- mutex_lock(sOSReportLock);
+ 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);
+ 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);
+ lck_mtx_unlock(sOSReportLock);
}
static vm_offset_t minstackaddr = min_valid_stack_address();
static unsigned int
i386_validate_raddr(vm_offset_t raddr)
{
- return ((raddr > VM_MIN_KERNEL_ADDRESS) &&
+ 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 __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_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 __i386__
-#define SANE_i386_FRAME_SIZE 8*1024
+#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 */
if (stackptr < stackptr_prev)
break;
- if ((stackptr_prev ^ stackptr) > SANE_i386_FRAME_SIZE)
+ if ((stackptr - stackptr_prev) > SANE_i386_FRAME_SIZE)
break;
raddr = *((vm_offset_t *) (stackptr + i386_RETURN_OFFSET));
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
projects / apple / xnu.git / blobdiff