1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #include <stdint.h> 28 #include <stdlib.h> 29 #include <strings.h> 30 31 int 32 baz(void) 33 { 34 return (8); 35 } 36 37 static int 38 foo(void) 39 { 40 /* 41 * In order to assure that our helper is properly employed to identify 42 * the frame, we're going to trampoline through data. 43 */ 44 uint32_t instr[] = { 45 0x9de3bfa0, /* save %sp, -0x60, %sp */ 46 0x40000000, /* call baz */ 47 0x01000000, /* nop */ 48 0x81c7e008, /* ret */ 49 0x81e80000 /* restore */ 50 }; 51 uint32_t *fp = malloc(sizeof (instr)); 52 53 /* 54 * Do our little relocation dance. 55 */ 56 instr[1] |= ((uintptr_t)baz - (uintptr_t)&fp[1]) >> 2; 57 58 /* 59 * Copy the code to the heap (it's a pain to build in ON with an 60 * executable stack). 61 */ 62 bcopy(instr, fp, sizeof (instr)); 63 64 (*(int (*)(void))fp)(); 65 66 free(fp); 67 68 return (0); 69 } 70 71 int 72 main(int argc, char **argv) 73 { 74 for (;;) { 75 foo(); 76 } 77 78 return (0); 79 } 80