| 1 | /* $NetBSD: profile.h,v 1.18.42.1 2026/04/02 19:12:03 martin 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 PLTSYM |
| 42 | |
| 43 | #if defined (_ARM_ARCH_4T) |
| 44 | # define RET "bx ip" |
| 45 | #else |
| 46 | # define RET "mov pc, ip" |
| 47 | #endif |
| 48 | |
| 49 | #if defined(__ARM_DWARF_EH__) |
| 50 | #define _PROF_UNWINDER_SAVE "" |
| 51 | #define _PROF_UNWINDER_START "" |
| 52 | #define _PROF_UNWINDER_END "" |
| 53 | #else |
| 54 | #define _PROF_UNWINDER_SAVE ".save {r0-r3, lr}\n" |
| 55 | #define _PROF_UNWINDER_START ".fnstart\n" |
| 56 | #define _PROF_UNWINDER_END ".fnend\n" |
| 57 | #endif |
| 58 | |
| 59 | #define MCOUNT_ASM_NAME "__gnu_mcount_nc" |
| 60 | #define MCOUNT \ |
| 61 | __asm(".text"); \ |
| 62 | __asm(".align 0"); \ |
| 63 | __asm(".arm"); \ |
| 64 | __asm(".type " MCOUNT_ASM_NAME ",%function"); \ |
| 65 | __asm(".global " MCOUNT_ASM_NAME); \ |
| 66 | __asm(MCOUNT_ASM_NAME ":"); \ |
| 67 | __asm(_PROF_UNWINDER_START); \ |
| 68 | __asm(".cfi_startproc"); \ |
| 69 | /* \ |
| 70 | * Preserve registers that are trashed during mcount \ |
| 71 | */ \ |
| 72 | __asm("push {r0-r3, lr}"); \ |
| 73 | __asm(_PROF_UNWINDER_SAVE); \ |
| 74 | __asm(".cfi_def_cfa_offset 20"); \ |
| 75 | __asm(".cfi_offset 14, -4"); \ |
| 76 | __asm(".cfi_offset 3, -8"); \ |
| 77 | __asm(".cfi_offset 2, -12"); \ |
| 78 | __asm(".cfi_offset 1, -16"); \ |
| 79 | __asm(".cfi_offset 0, -20"); \ |
| 80 | /* \ |
| 81 | * find the return address for mcount, \ |
| 82 | * and the return address for mcount's caller. \ |
| 83 | * \ |
| 84 | * frompcindex = pc pushed by call into self. \ |
| 85 | */ \ |
| 86 | __asm("ldr r0, [sp, #20]"); \ |
| 87 | /* \ |
| 88 | * selfpc = pc pushed by mcount call \ |
| 89 | */ \ |
| 90 | __asm("mov r1, lr"); \ |
| 91 | /* \ |
| 92 | * Call the real mcount code \ |
| 93 | */ \ |
| 94 | __asm("bl " ___STRING(_C_LABEL(_mcount)) PLTSYM); \ |
| 95 | /* \ |
| 96 | * Restore registers that were trashed during mcount \ |
| 97 | */ \ |
| 98 | __asm("pop {r0-r3, ip, lr}"); \ |
| 99 | __asm(RET); \ |
| 100 | __asm(".cfi_endproc"); \ |
| 101 | __asm(".size " MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME); |
| 102 | |
| 103 | #ifdef _KERNEL |
| 104 | #include <arm/cpufunc.h> |
| 105 | /* |
| 106 | * splhigh() and splx() are heavyweight, and call mcount(). Therefore |
| 107 | * we disabled interrupts (IRQ, but not FIQ) directly on the CPU. |
| 108 | * |
| 109 | * We're lucky that the CPSR and 's' both happen to be 'int's. |
| 110 | */ |
| 111 | #define MCOUNT_ENTER s = __set_cpsr_c(0x0080, 0x0080); /* kill IRQ */ |
| 112 | #define MCOUNT_EXIT __set_cpsr_c(0xffffffff, s); /* restore old value */ |
| 113 | #endif /* _KERNEL */ |