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profile.h revision 1.7.82.1 
      1 /*	$NetBSD: profile.h,v 1.7.82.1 2008/09/18 04:33:21 wrstuden Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2001 Ben Harris
      5  * Copyright (c) 1995-1996 Mark Brinicombe
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by Mark Brinicombe.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #define	_MCOUNT_DECL void _mcount
     34 
     35 /*
     36  * Cannot implement mcount in C as GCC will trash the ip register when it
     37  * pushes a trapframe. Pity we cannot insert assembly before the function
     38  * prologue.
     39  */
     40 
     41 #define MCOUNT_ASM_NAME "__mcount"
     42 #ifdef PIC
     43 #define	PLTSYM		"(PLT)"
     44 #endif
     45 
     46 #ifndef PLTSYM
     47 #define	PLTSYM
     48 #endif
     49 
     50 #define	MCOUNT								\
     51 	__asm(".text");						\
     52 	__asm(".align	0");						\
     53 	__asm(".type	" MCOUNT_ASM_NAME ",%function");		\
     54 	__asm(".global	" MCOUNT_ASM_NAME);			\
     55 	__asm(MCOUNT_ASM_NAME ":");					\
     56 	/*								\
     57 	 * Preserve registers that are trashed during mcount		\
     58 	 */								\
     59 	__asm("stmfd	sp!, {r0-r3, ip, lr}");				\
     60 	/* Check what mode we're in.  EQ => 32, NE => 26 */		\
     61 	__asm("teq	r0, r0");					\
     62 	__asm("teq	pc, r15");					\
     63 	/*								\
     64 	 * find the return address for mcount,				\
     65 	 * and the return address for mcount's caller.			\
     66 	 *								\
     67 	 * frompcindex = pc pushed by call into self.			\
     68 	 */								\
     69 	__asm("moveq	r0, ip");					\
     70 	__asm("bicne	r0, ip, #0xfc000003");	       			\
     71 	/*								\
     72 	 * selfpc = pc pushed by mcount call				\
     73 	 */								\
     74 	__asm("moveq	r1, lr");					\
     75 	__asm("bicne	r1, lr, #0xfc000003");				\
     76 	/*								\
     77 	 * Call the real mcount code					\
     78 	 */								\
     79 	__asm("bl	" ___STRING(_C_LABEL(_mcount)) PLTSYM);		\
     80 	/*								\
     81 	 * Restore registers that were trashed during mcount		\
     82 	 */								\
     83 	__asm("ldmfd	sp!, {r0-r3, lr, pc}");
     84 
     85 #ifdef _KERNEL
     86 #ifdef __PROG26
     87 extern int int_off_save(void);
     88 extern void int_restore(int);
     89 #define	MCOUNT_ENTER	(s = int_off_save())
     90 #define	MCOUNT_EXIT	int_restore(s)
     91 #else
     92 #include <arm/cpufunc.h>
     93 /*
     94  * splhigh() and splx() are heavyweight, and call mcount().  Therefore
     95  * we disabled interrupts (IRQ, but not FIQ) directly on the CPU.
     96  *
     97  * We're lucky that the CPSR and 's' both happen to be 'int's.
     98  */
     99 #define	MCOUNT_ENTER	s = __set_cpsr_c(0x0080, 0x0080);	/* kill IRQ */
    100 #define	MCOUNT_EXIT	__set_cpsr_c(0xffffffff, s);	/* restore old value */
    101 #endif /* !acorn26 */
    102 #endif /* _KERNEL */
    103