sys/arch/arm/include/profile.h

   1 /*      $NetBSD: profile.h,v 1.13 2013/11/30 21:07:59 joerg 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 #define PLTSYM
  43
  44 #if !defined(__ARM_EABI__)
  45 #define MCOUNT                                                          \
  46         __asm(".text");                                                 \
  47         __asm(".align   0");                                            \
  48         __asm(".arm");                                                  \
  49         __asm(".type    " MCOUNT_ASM_NAME ",%function");                \
  50         __asm(".global  " MCOUNT_ASM_NAME);                             \
  51         __asm(MCOUNT_ASM_NAME ":");                                     \
  52         /*                                                              \
  53          * Preserve registers that are trashed during mcount            \
  54          */                                                             \
  55         __asm("push     {r0-r3, ip, lr}");                              \
  56         /* Check what mode we're in.  EQ => 32, NE => 26 */             \
  57         __asm("teq      r0, r0");                                       \
  58         __asm("teq      pc, r15");                                      \
  59         /*                                                              \
  60          * find the return address for mcount,                          \
  61          * and the return address for mcount's caller.                  \
  62          *                                                              \
  63          * frompcindex = pc pushed by call into self.                   \
  64          */                                                             \
  65         __asm("moveq    r0, ip");                                       \
  66         __asm("bicne    r0, ip, #0xfc000003");                          \
  67         /*                                                              \
  68          * selfpc = pc pushed by mcount call                            \
  69          */                                                             \
  70         __asm("moveq    r1, lr");                                       \
  71         __asm("bicne    r1, lr, #0xfc000003");                          \
  72         /*                                                              \
  73          * Call the real mcount code                                    \
  74          */                                                             \
  75         __asm("bl       " ___STRING(_C_LABEL(_mcount)) PLTSYM);         \
  76         /*                                                              \
  77          * Restore registers that were trashed during mcount            \
  78          */                                                             \
  79         __asm("pop      {r0-r3, pc}");                                  \
  80         __asm(".size    " MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME);
  81 #else
  82 #define MCOUNT                                                          \
  83         __asm(".text");                                                 \
  84         __asm(".align   0");                                            \
  85         __asm(".arm");                                                  \
  86         __asm(".type    " MCOUNT_ASM_NAME ",%function");                \
  87         __asm(".global  " MCOUNT_ASM_NAME);                             \
  88         __asm(MCOUNT_ASM_NAME ":");                                     \
  89         __asm(".fnstart");                                              \
  90         __asm(".cfi_startproc");                                        \
  91         /*                                                              \
  92          * Preserve registers that are trashed during mcount            \
  93          */                                                             \
  94         __asm("push     {r0-r4, ip, lr}");                              \
  95         __asm(".save {r0-r4, lr}");                                     \
  96         __asm(".cfi_def_cfa_offset 24");                                \
  97         __asm(".cfi_offset 14, -4");                                    \
  98         __asm(".cfi_offset 4, -8");                                     \
  99         __asm(".cfi_offset 3, -12");                                    \
 100         __asm(".cfi_offset 2, -16");                                    \
 101         __asm(".cfi_offset 1, -20");                                    \
 102         __asm(".cfi_offset 0, -24");                                    \
 103         /*                                                              \
 104          * find the return address for mcount,                          \
 105          * and the return address for mcount's caller.                  \
 106          *                                                              \
 107          * frompcindex = pc pushed by call into self.                   \
 108          */                                                             \
 109         __asm("mov      r0, ip");                                       \
 110         /*                                                              \
 111          * selfpc = pc pushed by mcount call                            \
 112          */                                                             \
 113         __asm("mov      r1, lr");                                       \
 114         /*                                                              \
 115          * Call the real mcount code                                    \
 116          */                                                             \
 117         __asm("bl       " ___STRING(_C_LABEL(_mcount)) PLTSYM);         \
 118         /*                                                              \
 119          * Restore registers that were trashed during mcount            \
 120          */                                                             \
 121         __asm("pop      {r0-r4, lr, pc}");                              \
 122         __asm(".cfi_endproc");                                          \
 123         __asm(".fnend");                                                \
 124         __asm(".size    " MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME);
 125 #endif
 126
 127 #ifdef _KERNEL
 128 #ifdef __PROG26
 129 extern int int_off_save(void);
 130 extern void int_restore(int);
 131 #define MCOUNT_ENTER    (s = int_off_save())
 132 #define MCOUNT_EXIT     int_restore(s)
 133 #else
 134 #include <arm/cpufunc.h>
 135 /*
 136  * splhigh() and splx() are heavyweight, and call mcount().  Therefore
 137  * we disabled interrupts (IRQ, but not FIQ) directly on the CPU.
 138  *
 139  * We're lucky that the CPSR and 's' both happen to be 'int's.
 140  */
 141 #define MCOUNT_ENTER    s = __set_cpsr_c(0x0080, 0x0080);       /* kill IRQ */
 142 #define MCOUNT_EXIT     __set_cpsr_c(0xffffffff, s);    /* restore old value */
 143 #endif /* !acorn26 */
 144 #endif /* _KERNEL */