1178476Sjb/* 2178476Sjb * CDDL HEADER START 3178476Sjb * 4178476Sjb * The contents of this file are subject to the terms of the 5178476Sjb * Common Development and Distribution License (the "License"). 6178476Sjb * You may not use this file except in compliance with the License. 7178476Sjb * 8178476Sjb * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9178476Sjb * or http://www.opensolaris.org/os/licensing. 10178476Sjb * See the License for the specific language governing permissions 11178476Sjb * and limitations under the License. 12178476Sjb * 13178476Sjb * When distributing Covered Code, include this CDDL HEADER in each 14178476Sjb * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15178476Sjb * If applicable, add the following below this CDDL HEADER, with the 16178476Sjb * fields enclosed by brackets "[]" replaced with your own identifying 17178476Sjb * information: Portions Copyright [yyyy] [name of copyright owner] 18178476Sjb * 19178476Sjb * CDDL HEADER END 20178476Sjb */ 21178476Sjb 22178476Sjb/* 23178476Sjb * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24178476Sjb * Use is subject to license terms. 25178476Sjb */ 26178476Sjb 27178476Sjb#pragma ident "%Z%%M% %I% %E% SMI" 28178476Sjb 29178476Sjb#include <stdint.h> 30178476Sjb#include <stdlib.h> 31178476Sjb#include <strings.h> 32178476Sjb 33178476Sjbint 34178476Sjbbaz(void) 35178476Sjb{ 36178476Sjb return (8); 37178476Sjb} 38178476Sjb 39178476Sjbstatic int 40178476Sjbfoo(void) 41178476Sjb{ 42178476Sjb /* 43178476Sjb * In order to assure that our helper is properly employed to identify 44178476Sjb * the frame, we're going to trampoline through data. 45178476Sjb */ 46178476Sjb uint8_t instr[] = { 47178476Sjb 0x55, /* pushl %ebp */ 48178476Sjb 0x8b, 0xec, /* movl %esp, %ebp */ 49178476Sjb 0xe8, 0x0, 0x0, 0x0, 0x0, /* call baz */ 50178476Sjb 0x8b, 0xe5, /* movl %ebp, %esp */ 51178476Sjb 0x5d, /* popl %ebp */ 52178476Sjb 0xc3 /* ret */ 53178476Sjb }; 54178476Sjb uint8_t *fp = malloc(sizeof (instr)); 55178476Sjb 56178476Sjb /* 57178476Sjb * Do our little relocation dance. 58178476Sjb */ 59178476Sjb *((int *)&instr[4]) = (uintptr_t)baz - (uintptr_t)&fp[8]; 60178476Sjb 61178476Sjb /* 62178476Sjb * Copy the code to the heap (it's a pain to build in ON with an 63178476Sjb * executable stack). 64178476Sjb */ 65178476Sjb bcopy(instr, fp, sizeof (instr)); 66178476Sjb 67178476Sjb (*(int (*)(void))fp)(); 68178476Sjb 69178476Sjb free(fp); 70178476Sjb 71178476Sjb return (0); 72178476Sjb} 73178476Sjb 74178476Sjbint 75178476Sjbmain(int argc, char **argv) 76178476Sjb{ 77178476Sjb for (;;) { 78178476Sjb foo(); 79178476Sjb } 80178476Sjb 81178476Sjb return (0); 82178476Sjb} 83