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freebsd-dev/libexec/rtld-elf/debug.h

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Import the ELF dynamic linker. This is the ElfKit version with quite a few enhancements and bug fixes. There are still some known deficiencies, but it should be adequate to get us started with ELF. Submitted by: John Polstra <jdp@polstra.com>
1998-03-07 19:24:35 +00:00
/*-
libexec: adoption of SPDX licensing ID tags. Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
2017-11-27 15:25:02 +00:00
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
Import the ELF dynamic linker. This is the ElfKit version with quite a few enhancements and bug fixes. There are still some known deficiencies, but it should be adequate to get us started with ELF. Submitted by: John Polstra <jdp@polstra.com>
1998-03-07 19:24:35 +00:00
* Copyright 1996-1998 John D. Polstra.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
$Id$ -> $FreeBSD$
1999-08-28 00:22:10 +00:00
* $FreeBSD$
Import the ELF dynamic linker. This is the ElfKit version with quite a few enhancements and bug fixes. There are still some known deficiencies, but it should be adequate to get us started with ELF. Submitted by: John Polstra <jdp@polstra.com>
1998-03-07 19:24:35 +00:00
*/
/*
* Support for printing debugging messages.
*/
#ifndef DEBUG_H
#define DEBUG_H 1
Enable -Wformat checking for debug_printf().
1999-09-04 20:36:27 +00:00
#include <sys/cdefs.h>
Add a new function dllockinit() for registering thread locking functions to be used by the dynamic linker. This can be called by threads packages at start-up time. I will add the call to libc_r soon. Also add a default locking method that is used up until dllockinit() is called. The default method works by blocking SIGVTALRM, SIGPROF, and SIGALRM in critical sections. It is based on the observation that most user-space threads packages implement thread preemption with one of these signals (usually SIGVTALRM). The dynamic linker has never been reentrant, but it became less reentrant in revision 1.34 of "src/libexec/rtld-elf/rtld.c". Starting with that revision, multiple threads each doing lazy binding could interfere with each other. The usual symptom was that a symbol was falsely reported as undefined at start-up time. It was rare but not unseen. This commit fixes it.
1999-12-27 04:44:04 +00:00
#include <string.h>
Use rtld_putstr() instead of write() for the rtld msg() macro This removes an unnecessary libc dependency from rtld. See https://reviews.freebsd.org/D20663 for more details.
2019-06-26 15:43:26 +00:00
#include "rtld_printf.h"
Add a new function dllockinit() for registering thread locking functions to be used by the dynamic linker. This can be called by threads packages at start-up time. I will add the call to libc_r soon. Also add a default locking method that is used up until dllockinit() is called. The default method works by blocking SIGVTALRM, SIGPROF, and SIGALRM in critical sections. It is based on the observation that most user-space threads packages implement thread preemption with one of these signals (usually SIGVTALRM). The dynamic linker has never been reentrant, but it became less reentrant in revision 1.34 of "src/libexec/rtld-elf/rtld.c". Starting with that revision, multiple threads each doing lazy binding could interfere with each other. The usual symptom was that a symbol was falsely reported as undefined at start-up time. It was rare but not unseen. This commit fixes it.
1999-12-27 04:44:04 +00:00
ld-elf.so: make LD_DEBUG always functional. This causes some increase of the dynamic linker size, but benefits of avoiding compiling private copy or the linker when debugging is required. definitely worth it. The dbg() calls can be compiled out by defining LD_NO_DEBUG symbol. Sponsored by: The FreeBSD Foundation MFC after: 1 week
2019-04-14 18:04:53 +00:00
void debug_printf(const char *, ...) __printflike(1, 2);
Import the ELF dynamic linker. This is the ElfKit version with quite a few enhancements and bug fixes. There are still some known deficiencies, but it should be adequate to get us started with ELF. Submitted by: John Polstra <jdp@polstra.com>
1998-03-07 19:24:35 +00:00
extern int debug;
ld-elf.so: make LD_DEBUG always functional. This causes some increase of the dynamic linker size, but benefits of avoiding compiling private copy or the linker when debugging is required. definitely worth it. The dbg() calls can be compiled out by defining LD_NO_DEBUG symbol. Sponsored by: The FreeBSD Foundation MFC after: 1 week
2019-04-14 18:04:53 +00:00
#ifndef NO_LD_DEBUG
Use C99's varadic macro syntax instead of gcc's.
2006-03-28 18:26:47 +00:00
#define dbg(...) debug_printf(__VA_ARGS__)
Import the ELF dynamic linker. This is the ElfKit version with quite a few enhancements and bug fixes. There are still some known deficiencies, but it should be adequate to get us started with ELF. Submitted by: John Polstra <jdp@polstra.com>
1998-03-07 19:24:35 +00:00
#else
Use C99's varadic macro syntax instead of gcc's.
2006-03-28 18:26:47 +00:00
#define dbg(...) ((void) 0)
Import the ELF dynamic linker. This is the ElfKit version with quite a few enhancements and bug fixes. There are still some known deficiencies, but it should be adequate to get us started with ELF. Submitted by: John Polstra <jdp@polstra.com>
1998-03-07 19:24:35 +00:00
#endif
Add initial support for compiling a special 32 bit version of ld-elf.so.1 on 64 bit systems. Most of this involves using alternate paths, environment variables and diagnostic messages. The build glue is seperate.
2004-03-21 01:21:26 +00:00
#ifndef COMPAT_32BIT
#define _MYNAME "ld-elf.so.1"
#else
#define _MYNAME "ld-elf32.so.1"
#endif
Add a new function dllockinit() for registering thread locking functions to be used by the dynamic linker. This can be called by threads packages at start-up time. I will add the call to libc_r soon. Also add a default locking method that is used up until dllockinit() is called. The default method works by blocking SIGVTALRM, SIGPROF, and SIGALRM in critical sections. It is based on the observation that most user-space threads packages implement thread preemption with one of these signals (usually SIGVTALRM). The dynamic linker has never been reentrant, but it became less reentrant in revision 1.34 of "src/libexec/rtld-elf/rtld.c". Starting with that revision, multiple threads each doing lazy binding could interfere with each other. The usual symptom was that a symbol was falsely reported as undefined at start-up time. It was rare but not unseen. This commit fixes it.
1999-12-27 04:44:04 +00:00
#define assert(cond) ((cond) ? (void) 0 : \
Add initial support for compiling a special 32 bit version of ld-elf.so.1 on 64 bit systems. Most of this involves using alternate paths, environment variables and diagnostic messages. The build glue is seperate.
2004-03-21 01:21:26 +00:00
(msg(_MYNAME ": assert failed: " __FILE__ ":" \
Add a new function dllockinit() for registering thread locking functions to be used by the dynamic linker. This can be called by threads packages at start-up time. I will add the call to libc_r soon. Also add a default locking method that is used up until dllockinit() is called. The default method works by blocking SIGVTALRM, SIGPROF, and SIGALRM in critical sections. It is based on the observation that most user-space threads packages implement thread preemption with one of these signals (usually SIGVTALRM). The dynamic linker has never been reentrant, but it became less reentrant in revision 1.34 of "src/libexec/rtld-elf/rtld.c". Starting with that revision, multiple threads each doing lazy binding could interfere with each other. The usual symptom was that a symbol was falsely reported as undefined at start-up time. It was rare but not unseen. This commit fixes it.
1999-12-27 04:44:04 +00:00
__XSTRING(__LINE__) "\n"), abort()))
Use rtld_putstr() instead of write() for the rtld msg() macro This removes an unnecessary libc dependency from rtld. See https://reviews.freebsd.org/D20663 for more details.
2019-06-26 15:43:26 +00:00
#define msg(s) rtld_putstr(s)
Add initial support for compiling a special 32 bit version of ld-elf.so.1 on 64 bit systems. Most of this involves using alternate paths, environment variables and diagnostic messages. The build glue is seperate.
2004-03-21 01:21:26 +00:00
#define trace() msg(_MYNAME ": " __XSTRING(__LINE__) "\n")
Add a new function dllockinit() for registering thread locking functions to be used by the dynamic linker. This can be called by threads packages at start-up time. I will add the call to libc_r soon. Also add a default locking method that is used up until dllockinit() is called. The default method works by blocking SIGVTALRM, SIGPROF, and SIGALRM in critical sections. It is based on the observation that most user-space threads packages implement thread preemption with one of these signals (usually SIGVTALRM). The dynamic linker has never been reentrant, but it became less reentrant in revision 1.34 of "src/libexec/rtld-elf/rtld.c". Starting with that revision, multiple threads each doing lazy binding could interfere with each other. The usual symptom was that a symbol was falsely reported as undefined at start-up time. It was rare but not unseen. This commit fixes it.
1999-12-27 04:44:04 +00:00
Import the ELF dynamic linker. This is the ElfKit version with quite a few enhancements and bug fixes. There are still some known deficiencies, but it should be adequate to get us started with ELF. Submitted by: John Polstra <jdp@polstra.com>
1998-03-07 19:24:35 +00:00
#endif /* DEBUG_H */
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