diff options
Diffstat (limited to 'cddl/contrib/opensolaris/cmd/dtrace/test/tst/i386/ustack/tst.helper.c')
-rw-r--r-- | cddl/contrib/opensolaris/cmd/dtrace/test/tst/i386/ustack/tst.helper.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/i386/ustack/tst.helper.c b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/i386/ustack/tst.helper.c new file mode 100644 index 0000000..69ab6a8 --- /dev/null +++ b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/i386/ustack/tst.helper.c @@ -0,0 +1,82 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ + +/* + * Copyright 2007 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#pragma ident "%Z%%M% %I% %E% SMI" + +#include <stdint.h> +#include <stdlib.h> +#include <strings.h> + +int +baz(void) +{ + return (8); +} + +static int +foo(void) +{ + /* + * In order to assure that our helper is properly employed to identify + * the frame, we're going to trampoline through data. + */ + uint8_t instr[] = { + 0x55, /* pushl %ebp */ + 0x8b, 0xec, /* movl %esp, %ebp */ + 0xe8, 0x0, 0x0, 0x0, 0x0, /* call baz */ + 0x8b, 0xe5, /* movl %ebp, %esp */ + 0x5d, /* popl %ebp */ + 0xc3 /* ret */ + }; + uint8_t *fp = malloc(sizeof (instr)); + + /* + * Do our little relocation dance. + */ + *((int *)&instr[4]) = (uintptr_t)baz - (uintptr_t)&fp[8]; + + /* + * Copy the code to the heap (it's a pain to build in ON with an + * executable stack). + */ + bcopy(instr, fp, sizeof (instr)); + + (*(int (*)(void))fp)(); + + free(fp); + + return (0); +} + +int +main(int argc, char **argv) +{ + for (;;) { + foo(); + } + + return (0); +} |