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Annotation of sys/arch/arm/include/profile.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: profile.h,v 1.1 2004/02/01 05:09:49 drahn Exp $       */
        !             2: /*     $NetBSD: profile.h,v 1.5 2002/03/24 15:49:40 bjh21 Exp $        */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 2001 Ben Harris
        !             6:  * Copyright (c) 1995-1996 Mark Brinicombe
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by Mark Brinicombe.
        !            19:  * 4. The name of the author may not be used to endorse or promote products
        !            20:  *    derived from this software without specific prior written permission.
        !            21:  *
        !            22:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            23:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            24:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            25:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            26:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            27:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            28:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            29:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            30:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            31:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            32:  */
        !            33:
        !            34: #define        _MCOUNT_DECL void _mcount
        !            35:
        !            36: /*
        !            37:  * Cannot implement mcount in C as GCC will trash the ip register when it
        !            38:  * pushes a trapframe. Pity we cannot insert assembly before the function
        !            39:  * prologue.
        !            40:  */
        !            41:
        !            42: #ifdef __ELF__
        !            43: #define MCOUNT_ASM_NAME "__mcount"
        !            44: #ifdef PIC
        !            45: #define        PLTSYM          "(PLT)"
        !            46: #endif
        !            47: #else
        !            48: #define MCOUNT_ASM_NAME "mcount"
        !            49: #endif
        !            50:
        !            51: #ifndef PLTSYM
        !            52: #define        PLTSYM
        !            53: #endif
        !            54:
        !            55: #define        MCOUNT                                                          \
        !            56:        __asm__(".text");                                               \
        !            57:        __asm__(".align 0");                                            \
        !            58:        __asm__(".type  " MCOUNT_ASM_NAME ",%function");                \
        !            59:        __asm__(".global        " MCOUNT_ASM_NAME);                     \
        !            60:        __asm__(MCOUNT_ASM_NAME ":");                                   \
        !            61:        /*                                                              \
        !            62:         * Preserve registers that are trashed during mcount            \
        !            63:         */                                                             \
        !            64:        __asm__("stmfd  sp!, {r0-r3, ip, lr}");                         \
        !            65:        /* Check what mode we're in.  EQ => 32, NE => 26 */             \
        !            66:        __asm__("teq    r0, r0");                                       \
        !            67:        __asm__("teq    pc, r15");                                      \
        !            68:        /*                                                              \
        !            69:         * find the return address for mcount,                          \
        !            70:         * and the return address for mcount's caller.                  \
        !            71:         *                                                              \
        !            72:         * frompcindex = pc pushed by call into self.                   \
        !            73:         */                                                             \
        !            74:        __asm__("moveq  r0, ip");                                       \
        !            75:        __asm__("bicne  r0, ip, #0xfc000003");                          \
        !            76:        /*                                                              \
        !            77:         * selfpc = pc pushed by mcount call                            \
        !            78:         */                                                             \
        !            79:        __asm__("moveq  r1, lr");                                       \
        !            80:        __asm__("bicne  r1, lr, #0xfc000003");                          \
        !            81:        /*                                                              \
        !            82:         * Call the real mcount code                                    \
        !            83:         */                                                             \
        !            84:        __asm__("bl     " __STRING(_mcount) PLTSYM);            \
        !            85:        /*                                                              \
        !            86:         * Restore registers that were trashed during mcount            \
        !            87:         */                                                             \
        !            88:        __asm__("ldmfd  sp!, {r0-r3, lr, pc}");
        !            89:
        !            90: #ifdef _KERNEL
        !            91: #ifdef __PROG26
        !            92: extern int int_off_save(void);
        !            93: extern void int_restore(int);
        !            94: #define        MCOUNT_ENTER    (s = int_off_save())
        !            95: #define        MCOUNT_EXIT     int_restore(s)
        !            96: #else
        !            97: #include <arm/cpufunc.h>
        !            98: /*
        !            99:  * splhigh() and splx() are heavyweight, and call mcount().  Therefore
        !           100:  * we disabled interrupts (IRQ, but not FIQ) directly on the CPU.
        !           101:  *
        !           102:  * We're lucky that the CPSR and 's' both happen to be 'int's.
        !           103:  */
        !           104: #define        MCOUNT_ENTER    s = __set_cpsr_c(0x0080, 0x0080);       /* kill IRQ */
        !           105: #define        MCOUNT_EXIT     __set_cpsr_c(0xffffffff, s);    /* restore old value */
        !           106: #endif /* !acorn26 */
        !           107: #endif /* _KERNEL */