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Annotation of sys/arch/arm/include/profile.h, Revision 1.1.1.1

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 */