dtrace_data.c revision e127a3e717f822eb855235fa3bd08235b2cf533d
/*
* 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 <sys/types.h>
/*
* In order to let the DTrace fasttrap provider trace processes before libc
* is initialized, we place this structure in the thread pointer register.
* This is communicated to the kernel (in the elfexec() function) by
* placing the address of this structure in the PT_SUNWDTRACE program
* header with the -zdtrace_data=<object> option to ld(1).
*
* Besides DTrace use, the initialization sequence carried out for the
* PT_SUNWDTRACE data is an essential step required for the correct
* initialization of any process. Therefore, PT_SUNWDTRACE data must
* exist in any interpretor available on Solaris.
*
* ld.so.1 is the standard interpretor on all Solaris platforms. However,
* for ABI compliance, 32-bit executables are able to identify libc.so.1
* as their interpretor. Therefore, this data file is used to build all
* instances of ld.so.1, and the 32-bit versions of libc.so.1. Note,
* although libc.so.1 can act as an interpretor for 32-bit applications,
* libc.so.1 only provides a bootstrap mechanism to load and jump to
* ld.so.1.
*
* The fields of the program header are set as follows:
* p_type: PT_SUNWDTRACE
* p_vaddr: address of dtrace_data
* p_memsz: size of dtrace_data
* p_flags: flags of segment dtrace_data is assigned to
* p_paddr: <reserved>
* p_filesz: <reserved>
* p_offset: <reserved>
* p_align: <reserved>
*
* See the comment in fasttrap.h for information on how to safely change
* this data structure and the other places that need to be kept in sync.
*/
#if defined(__sparc)
#pragma align 64(dtrace_data)
uint32_t dtrace_data[32] = {
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0x9de04000, /* save %g1, %g0, %sp */
0x81e80000, /* restore %g0, %g0, %g0 */
0x91d0203a, /* ta 0x3a */
0x81ca0000, /* return %o0 */
0, 0, /* self pointer (must be zero) */
0, 0,
0, 0, 0, 0, 0, 0, 0, 0
};
#elif defined(__amd64)
#pragma align 64(dtrace_data)
uint8_t dtrace_data[64] = {
0, 0, 0, 0, 0, 0, 0, 0, /* self pointer (must be zero) */
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0
};
#elif defined(__i386)
#pragma align 64(dtrace_data)
uint8_t dtrace_data[64] = {
0, 0, 0, 0, /* self pointer (must be zero) */
0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0
};
#else
#error "unknown ISA"
#endif