/*      $NetBSD: profile.h,v 1.21 2026/03/26 18:06:59 skrll Exp $       */

/*
 * Copyright (c) 2001 Ben Harris
 * Copyright (c) 1995-1996 Mark Brinicombe
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Mark Brinicombe.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#define _MCOUNT_DECL void _mcount

/*
 * Cannot implement mcount in C as GCC will trash the ip register when it
 * pushes a trapframe. Pity we cannot insert assembly before the function
 * prologue.
 */

#define PLTSYM

#if defined (_ARM_ARCH_4T)
# define RET            "bx     ip"
#else
# define RET            "mov    pc, ip"
#endif

#if defined(__ARM_DWARF_EH__)
#define _PROF_UNWINDER_SAVE     ""
#define _PROF_UNWINDER_START    ""
#define _PROF_UNWINDER_END      ""
#else
#define _PROF_UNWINDER_SAVE     ".save {r0-r3, lr}\n"
#define _PROF_UNWINDER_START    ".fnstart\n"
#define _PROF_UNWINDER_END      ".fnend\n"
#endif

#define MCOUNT_ASM_NAME "__gnu_mcount_nc"
#define MCOUNT                                                          \
        __asm(".text");                                                 \
        __asm(".align   0");                                            \
        __asm(".arm");                                                  \
        __asm(".type    " MCOUNT_ASM_NAME ",%function");                \
        __asm(".global  " MCOUNT_ASM_NAME);                             \
        __asm(MCOUNT_ASM_NAME ":");                                     \
        __asm(_PROF_UNWINDER_START);                                    \
        __asm(".cfi_startproc");                                        \
        /*                                                              \
         * Preserve registers that are trashed during mcount            \
         */                                                             \
        __asm("push     {r0-r3, lr}");                                  \
        __asm(_PROF_UNWINDER_SAVE);                                     \
        __asm(".cfi_def_cfa_offset 20");                                \
        __asm(".cfi_offset 14, -4");                                    \
        __asm(".cfi_offset 3, -8");                                     \
        __asm(".cfi_offset 2, -12");                                    \
        __asm(".cfi_offset 1, -16");                                    \
        __asm(".cfi_offset 0, -20");                                    \
        /*                                                              \
         * find the return address for mcount,                          \
         * and the return address for mcount's caller.                  \
         *                                                              \
         * frompcindex = pc pushed by call into self.                   \
         */                                                             \
        __asm("ldr      r0, [sp, #20]");                                \
        /*                                                              \
         * selfpc = pc pushed by mcount call                            \
         */                                                             \
        __asm("mov      r1, lr");                                       \
        /*                                                              \
         * Call the real mcount code                                    \
         */                                                             \
        __asm("bl       " ___STRING(_C_LABEL(_mcount)) PLTSYM);         \
        /*                                                              \
         * Restore registers that were trashed during mcount            \
         */                                                             \
        __asm("pop      {r0-r3, ip, lr}");                              \
        __asm(RET);                                                     \
        __asm(".cfi_endproc");                                          \
        __asm(".size    " MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME);

#ifdef _KERNEL
#include <arm/cpufunc.h>
/*
 * splhigh() and splx() are heavyweight, and call mcount().  Therefore
 * we disabled interrupts (IRQ, but not FIQ) directly on the CPU.
 *
 * We're lucky that the CPSR and 's' both happen to be 'int's.
 */
#define MCOUNT_ENTER    s = __set_cpsr_c(0x0080, 0x0080);       /* kill IRQ */
#define MCOUNT_EXIT     __set_cpsr_c(0xffffffff, s);    /* restore old value */
#endif /* _KERNEL */