sys/arch/arm/include/profile.h

   1 /*      $NetBSD: profile.h,v 1.8 2008/08/29 19:08:29 matt 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 */