Home | History | Annotate | Line # | Download | only in include
profile.h revision 1.1 
      1 /*	$NetBSD: profile.h,v 1.1 2001/02/23 21:23:48 reinoud Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995-1996 Mark Brinicombe
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed by Mark Brinicombe.
     17  * 4. The name of the author may not be used to endorse or promote products
     18  *    derived from this software without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #define	_MCOUNT_DECL void _mcount
     33 
     34 /*
     35  * Cannot implement mcount in C as GCC will trash the ip register when it
     36  * pushes a trapframe. Pity we cannot insert assembly before the function
     37  * prologue.
     38  */
     39 #define	MCOUNT								\
     40 	__asm__(".text");						\
     41 	__asm__(".align	0");						\
     42 	__asm__(".type	mcount,@function");				\
     43 	__asm__(".global	mcount");				\
     44 	__asm__("mcount:");						\
     45 	/*								\
     46 	 * Preserve registers that are trashed during mcount		\
     47 	 */								\
     48 	__asm__("stmfd	sp!, {r0-r3, ip, lr}");				\
     49 	/*								\
     50 	 * find the return address for mcount,				\
     51 	 * and the return address for mcount's caller.			\
     52 	 *								\
     53 	 * frompcindex = pc pushed by call into self.			\
     54 	 */								\
     55 	__asm__("mov	r0, ip");					\
     56 	/*								\
     57 	 * selfpc = pc pushed by mcount call				\
     58 	 */								\
     59 	__asm__("mov	r1, lr");					\
     60 	/*								\
     61 	 * Call the real mcount code					\
     62 	 */								\
     63 	__asm__("bl	__mcount");					\
     64 	/*								\
     65 	 * Restore registers that were trashed during mcount		\
     66 	 */								\
     67 	__asm__("ldmfd	sp!, {r0-r3, lr, pc}");
     68 
     69 #ifdef _KERNEL
     70 #include <machine/cpufunc.h>
     71 /*
     72  * splhigh() and splx() are heavyweight, and call mcount().  Therefore
     73  * we disabled interrupts (IRQ, but not FIQ) directly on the CPU.
     74  *
     75  * We're lucky that the CPSR and 's' both happen to be 'int's.
     76  */
     77 #define	MCOUNT_ENTER	s = SetCPSR(0x0080, 0x0080);	/* set IRQ disable bit */
     78 #define	MCOUNT_EXIT	SetCPSR(0xffffffff, s);		/* restore old value */
     79 #endif /* _KERNEL */
     80