1 /* $NetBSD: profile.h,v 1.12 2013/09/12 15:36:17 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 #ifdef __PIC__ 43 #define PLTSYM "(PLT)" 44 #endif 45 46 #ifndef PLTSYM 47 #define PLTSYM 48 #endif 49 50 #if !defined(__ARM_EABI__) 51 #define MCOUNT \ 52 __asm(".text"); \ 53 __asm(".align 0"); \ 54 __asm(".arm"); \ 55 __asm(".type " MCOUNT_ASM_NAME ",%function"); \ 56 __asm(".global " MCOUNT_ASM_NAME); \ 57 __asm(MCOUNT_ASM_NAME ":"); \ 58 /* \ 59 * Preserve registers that are trashed during mcount \ 60 */ \ 61 __asm("push {r0-r3, ip, lr}"); \ 62 /* Check what mode we're in. EQ => 32, NE => 26 */ \ 63 __asm("teq r0, r0"); \ 64 __asm("teq pc, r15"); \ 65 /* \ 66 * find the return address for mcount, \ 67 * and the return address for mcount's caller. \ 68 * \ 69 * frompcindex = pc pushed by call into self. \ 70 */ \ 71 __asm("moveq r0, ip"); \ 72 __asm("bicne r0, ip, #0xfc000003"); \ 73 /* \ 74 * selfpc = pc pushed by mcount call \ 75 */ \ 76 __asm("moveq r1, lr"); \ 77 __asm("bicne r1, lr, #0xfc000003"); \ 78 /* \ 79 * Call the real mcount code \ 80 */ \ 81 __asm("bl " ___STRING(_C_LABEL(_mcount)) PLTSYM); \ 82 /* \ 83 * Restore registers that were trashed during mcount \ 84 */ \ 85 __asm("pop {r0-r3, pc}"); \ 86 __asm(".size " MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME); 87 #else 88 #define MCOUNT \ 89 __asm(".text"); \ 90 __asm(".align 0"); \ 91 __asm(".arm"); \ 92 __asm(".type " MCOUNT_ASM_NAME ",%function"); \ 93 __asm(".global " MCOUNT_ASM_NAME); \ 94 __asm(MCOUNT_ASM_NAME ":"); \ 95 __asm(".fnstart"); \ 96 __asm(".cfi_startproc"); \ 97 /* \ 98 * Preserve registers that are trashed during mcount \ 99 */ \ 100 __asm("push {r0-r4, ip, lr}"); \ 101 __asm(".save {r0-r4, lr}"); \ 102 __asm(".cfi_def_cfa_offset 24"); \ 103 __asm(".cfi_offset 14, -4"); \ 104 __asm(".cfi_offset 4, -8"); \ 105 __asm(".cfi_offset 3, -12"); \ 106 __asm(".cfi_offset 2, -16"); \ 107 __asm(".cfi_offset 1, -20"); \ 108 __asm(".cfi_offset 0, -24"); \ 109 /* \ 110 * find the return address for mcount, \ 111 * and the return address for mcount's caller. \ 112 * \ 113 * frompcindex = pc pushed by call into self. \ 114 */ \ 115 __asm("mov r0, ip"); \ 116 /* \ 117 * selfpc = pc pushed by mcount call \ 118 */ \ 119 __asm("mov r1, lr"); \ 120 /* \ 121 * Call the real mcount code \ 122 */ \ 123 __asm("bl " ___STRING(_C_LABEL(_mcount)) PLTSYM); \ 124 /* \ 125 * Restore registers that were trashed during mcount \ 126 */ \ 127 __asm("pop {r0-r4, lr, pc}"); \ 128 __asm(".cfi_endproc"); \ 129 __asm(".fnend"); \ 130 __asm(".size " MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME); 131 #endif 132 133 #ifdef _KERNEL 134 #ifdef __PROG26 135 extern int int_off_save(void); 136 extern void int_restore(int); 137 #define MCOUNT_ENTER (s = int_off_save()) 138 #define MCOUNT_EXIT int_restore(s) 139 #else 140 #include <arm/cpufunc.h> 141 /* 142 * splhigh() and splx() are heavyweight, and call mcount(). Therefore 143 * we disabled interrupts (IRQ, but not FIQ) directly on the CPU. 144 * 145 * We're lucky that the CPSR and 's' both happen to be 'int's. 146 */ 147 #define MCOUNT_ENTER s = __set_cpsr_c(0x0080, 0x0080); /* kill IRQ */ 148 #define MCOUNT_EXIT __set_cpsr_c(0xffffffff, s); /* restore old value */ 149 #endif /* !acorn26 */ 150 #endif /* _KERNEL */ 151