Import the librtld_db library. This is needed by userland DTrace.
This is not yet enabled in the build because I also need to import a new version of libproc. Sponsored by: The FreeBSD Foundation
This commit is contained in:
parent
0ccd4521f0
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14
lib/librtld_db/Makefile
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14
lib/librtld_db/Makefile
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@ -0,0 +1,14 @@
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# $FreeBSD$
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.include <bsd.own.mk>
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LIB= rtld_db
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SHLIB_MAJOR= 1
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MAN= librtld_db.3
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SRCS= rtld_db.c
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INCS= rtld_db.h
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CFLAGS+= -I${.CURDIR}
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.include <bsd.lib.mk>
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191
lib/librtld_db/librtld_db.3
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191
lib/librtld_db/librtld_db.3
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.\"-
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.\" Copyright (c) 2010 The FreeBSD Foundation
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.\" All rights reserved.
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.\"
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.\" This software was developed by Rui Paulo under sponsorship from
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.\" the FreeBSD Foundation.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
|
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
|
||||
.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd June 10, 2010
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.Dt LIBRTLD_DB 3
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.Os
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.Sh NAME
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.Nm librtld_db
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.Nd library for run-time linker debugging
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.Sh LIBRARY
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.Lb librtld_db
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.Sh SYNOPSIS
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.In rtld_db.h
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.Ft void
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.Fo rd_delete
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.Fa "rd_agent_t *rdap"
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.Fc
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.Ft char *
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.Fo rd_errstr
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.Fa "rd_err_e rderr"
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.Fc
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.Ft rd_err_e
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.Fo rd_event_addr
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.Fa "rd_agent_t *rdap, rd_notify_t *notify"
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.Fc
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.Ft rd_err_e
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.Fo rd_event_enable
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.Fa "rd_agent_t *rdap, int onoff"
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.Fc
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.Ft rd_err_e
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.Fo rd_event_getmsg
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.Fa "rd_agent_t *rdap, rd_event_msg_t *msg"
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.Fc
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.Ft rd_err_e
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.Fo rd_init
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.Fa "int version"
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.Fc
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.Ft typedef int
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.Fo rl_iter_f
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.Fa "const rd_loadobj_t *, void *"
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.Fc
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.Ft rd_err_e
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.Fo rd_loadobj_iter
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.Fa "rd_agent_t *rdap, rl_iter_f *cb, void *clnt_data"
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.Fc
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.Ft void
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.Fo rd_log
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.Fa "const int onoff"
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.Fc
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.Ft rd_agent_t *
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.Fo rd_new
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.Fa "struct proc_handle *php"
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.Fc
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.Ft rd_err_e
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.Fo rd_objpad_enable
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.Fa "rd_agent_t *rdap, size_t padsize"
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.Fc
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.Ft rd_err_e
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.Fo rd_plt_resolution
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.Fa "rd_agent_t *rdap, uintptr_t pc, struct proc *proc
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.Fa "uintptr_t plt_base, rd_plt_info_t *rpi"
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.Fc
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.Ft rd_err_e
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.Fo rd_reset
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.Fa "rd_agent_t *rdap"
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.Fc
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.Sh DESCRIPTION
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The
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.Nm librtld_db
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library provides a debugging interface to the run-time linker (rtld).
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This library must be used along with
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.Xr libproc 3 .
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.Pp
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Most library functions take a
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.Ft rd_agent_t
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argument.
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This argument is an opaque structure containing information associated with
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the current status of the agent.
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.Pp
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Before you start using
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.Nm
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you should call
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.Fn rd_init
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with the
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.Ft RD_VERSION
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argument.
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This initializes the library to the correct version your program was compiled
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with and provides proper ABI stability.
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.Pp
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What follows is a description of what each function.
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.Pp
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.Fn rd_new
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creates a new
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.Nm
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agent.
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The
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.Ft php
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argument should be the
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.Ft proc_handle
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you received from
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.Xr libproc 3 .
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.Pp
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.Fn rd_reset
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resets your previously created agent.
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.Pp
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.Fn rd_delete
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dealocates the resources associated with the agent.
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.Pp
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.Fn rd_errstr
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returns an error string describing the error present in
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.Ft rderr .
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.Pp
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.Fn rd_event_enable
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enables reporting of events.
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This function always returns RD_OK.
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.Pp
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.Fn rd_event_addr
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returns the event address in the
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.Ft event
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paramenter.
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At the moment we only report RD_NOTIFY_BPT events.
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.Pp
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.Fn rd_event_getmsg
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returns the message assoicated wit hthe latest event.
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At the moment only RD_POSTINIT events are supported.
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.Pp
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.Fn rd_loadobj_iter
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allows you to iterate over the program's loaded objects.
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.Ft cb
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is a callback of type
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.Fn rl_iter_f .
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.Sh RETURN VALUES
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Most functions return an
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.Ft rd_err_e
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type error.
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The error codes are described in the header file for this library.
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You can get the error string using
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.Fn rd_errstr .
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.Sh CAVEATS
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The functions
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.Fn rd_event_enable ,
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.Fn rd_log ,
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.Fn rd_objpad_enable
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and
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.Fn rd_plt_resolution
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are not yet implemented.
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.Sh SEE ALSO
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.Xr ld 1 ,
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.Xr ld-elf.so.1 1 ,
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.Xr ld.so 1 ,
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.Xr libproc 3 ,
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.Xr rtld 1
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.Sh HISTORY
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The
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.Nm librtld_db
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library first appeared in
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.Fx 9.0
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and was modeled after the same library present in the Solaris operating system.
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.Sh AUTHORS
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The
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.Nm librtld_db
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library and this manual page were written by
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.An Rui Paulo Aq rpaulo@FreeBSD.org
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under sponsorship from the FreeBSD Foundation.
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226
lib/librtld_db/rtld_db.c
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226
lib/librtld_db/rtld_db.c
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/*
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* Copyright (c) 2010 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Rui Paulo under sponsorship from the
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* FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* 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.
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||||
*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <machine/_inttypes.h>
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#include <sys/types.h>
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#include <sys/user.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <libproc.h>
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#include <libutil.h>
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#include "rtld_db.h"
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static int _librtld_db_debug = 0;
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#define DPRINTF(...) do { \
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if (_librtld_db_debug) { \
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fprintf(stderr, "librtld_db: DEBUG: "); \
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fprintf(stderr, __VA_ARGS__); \
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} \
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} while (0)
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void
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rd_delete(rd_agent_t *rdap)
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{
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free(rdap);
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}
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const char *
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rd_errstr(rd_err_e rderr)
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{
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switch (rderr) {
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case RD_ERR:
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return "generic error";
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case RD_OK:
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return "no error";
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case RD_NOCAPAB:
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return "capability not supported";
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case RD_DBERR:
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return "database error";
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case RD_NOBASE:
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return "NOBASE";
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case RD_NOMAPS:
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return "NOMAPS";
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default:
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return "unknown error";
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}
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}
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rd_err_e
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rd_event_addr(rd_agent_t *rdap, rd_event_e event __unused, rd_notify_t *notify)
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{
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DPRINTF("%s rdap %p notify %p\n", __func__, rdap, notify);
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notify->type = RD_NOTIFY_BPT;
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notify->u.bptaddr = rdap->rda_addr;
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return (RD_OK);
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}
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rd_err_e
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rd_event_enable(rd_agent_t *rdap __unused, int onoff)
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{
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DPRINTF("%s onoff %d\n", __func__, onoff);
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return (RD_OK);
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}
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rd_err_e
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rd_event_getmsg(rd_agent_t *rdap __unused, rd_event_msg_t *msg)
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{
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DPRINTF("%s\n", __func__);
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msg->type = RD_POSTINIT;
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msg->u.state = RD_CONSISTENT;
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return (RD_OK);
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}
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rd_err_e
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rd_init(int version)
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{
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char *debug = NULL;
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if (version == RD_VERSION) {
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debug = getenv("LIBRTLD_DB_DEBUG");
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_librtld_db_debug = debug ? atoi(debug) : 0;
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return (RD_OK);
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} else
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return (RD_NOCAPAB);
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}
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rd_err_e
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rd_loadobj_iter(rd_agent_t *rdap, rl_iter_f *cb, void *clnt_data)
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{
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int cnt, i, lastvn = 0;
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rd_loadobj_t rdl;
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struct kinfo_vmentry *kves, *kve;
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DPRINTF("%s\n", __func__);
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if ((kves = kinfo_getvmmap(proc_getpid(rdap->rda_php), &cnt)) == NULL) {
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warn("ERROR: kinfo_getvmmap() failed");
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return (RD_ERR);
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}
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for (i = 0; i < cnt; i++) {
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kve = kves + i;
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if (kve->kve_type == KVME_TYPE_VNODE)
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lastvn = i;
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memset(&rdl, 0, sizeof(rdl));
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/*
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* Map the kinfo_vmentry struct to the rd_loadobj structure.
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*/
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rdl.rdl_saddr = kve->kve_start;
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rdl.rdl_eaddr = kve->kve_end;
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rdl.rdl_offset = kve->kve_offset;
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if (kve->kve_protection & KVME_PROT_READ)
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rdl.rdl_prot |= RD_RDL_R;
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if (kve->kve_protection & KVME_PROT_WRITE)
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rdl.rdl_prot |= RD_RDL_W;
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if (kve->kve_protection & KVME_PROT_EXEC)
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rdl.rdl_prot |= RD_RDL_X;
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strlcpy(rdl.rdl_path, kves[lastvn].kve_path,
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sizeof(rdl.rdl_path));
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(*cb)(&rdl, clnt_data);
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}
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free(kves);
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return (RD_OK);
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}
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void
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rd_log(const int onoff)
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{
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DPRINTF("%s\n", __func__);
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(void)onoff;
|
||||
}
|
||||
|
||||
rd_agent_t *
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rd_new(struct proc_handle *php)
|
||||
{
|
||||
rd_agent_t *rdap;
|
||||
|
||||
rdap = malloc(sizeof(rd_agent_t));
|
||||
if (rdap) {
|
||||
memset(rdap, 0, sizeof(rd_agent_t));
|
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rdap->rda_php = php;
|
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rd_reset(rdap);
|
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}
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|
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return (rdap);
|
||||
}
|
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|
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rd_err_e
|
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rd_objpad_enable(rd_agent_t *rdap, size_t padsize)
|
||||
{
|
||||
DPRINTF("%s\n", __func__);
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||||
|
||||
(void)rdap;
|
||||
(void)padsize;
|
||||
|
||||
return (RD_ERR);
|
||||
}
|
||||
|
||||
rd_err_e
|
||||
rd_plt_resolution(rd_agent_t *rdap, uintptr_t pc, struct proc *proc,
|
||||
uintptr_t plt_base, rd_plt_info_t *rpi)
|
||||
{
|
||||
DPRINTF("%s\n", __func__);
|
||||
|
||||
(void)rdap;
|
||||
(void)pc;
|
||||
(void)proc;
|
||||
(void)plt_base;
|
||||
(void)rpi;
|
||||
|
||||
return (RD_ERR);
|
||||
}
|
||||
|
||||
rd_err_e
|
||||
rd_reset(rd_agent_t *rdap)
|
||||
{
|
||||
GElf_Sym sym;
|
||||
|
||||
if (proc_name2sym(rdap->rda_php, "ld-elf.so.1", "r_debug_state",
|
||||
&sym) < 0)
|
||||
return (RD_ERR);
|
||||
DPRINTF("found r_debug_state at 0x%lx\n", (unsigned long)sym.st_value);
|
||||
rdap->rda_addr = sym.st_value;
|
||||
|
||||
return (RD_OK);
|
||||
}
|
150
lib/librtld_db/rtld_db.h
Normal file
150
lib/librtld_db/rtld_db.h
Normal file
@ -0,0 +1,150 @@
|
||||
/*
|
||||
* Copyright (c) 2010 The FreeBSD Foundation
|
||||
* All rights reserved.
|
||||
*
|
||||
* This software was developed by Rui Paulo under sponsorship from the
|
||||
* FreeBSD Foundation.
|
||||
*
|
||||
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
|
||||
*
|
||||
* $FreeBSD$
|
||||
*/
|
||||
|
||||
#ifndef _RTLD_DB_H_
|
||||
#define _RTLD_DB_H_
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/cdefs.h>
|
||||
#include <sys/types.h>
|
||||
|
||||
|
||||
#define RD_VERSION 1
|
||||
|
||||
typedef enum {
|
||||
RD_OK,
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||||
RD_ERR,
|
||||
RD_DBERR,
|
||||
RD_NOCAPAB,
|
||||
RD_NODYNAM,
|
||||
RD_NOBASE,
|
||||
RD_NOMAPS
|
||||
} rd_err_e;
|
||||
|
||||
typedef struct rd_agent {
|
||||
struct proc_handle *rda_php;
|
||||
uintptr_t rda_addr; /* address of r_debug_state */
|
||||
} rd_agent_t;
|
||||
|
||||
typedef struct rd_loadobj {
|
||||
uintptr_t rdl_saddr; /* start address */
|
||||
uintptr_t rdl_eaddr; /* end address */
|
||||
uint32_t rdl_offset;
|
||||
uint8_t rdl_prot;
|
||||
#define RD_RDL_R 0x01
|
||||
#define RD_RDL_W 0x02
|
||||
#define RD_RDL_X 0x04
|
||||
enum {
|
||||
RDL_TYPE_NONE = 0,
|
||||
RDL_TYPE_DEF,
|
||||
RDL_TYPE_VNODE,
|
||||
RDL_TYPE_SWAP,
|
||||
RDL_TYPE_DEV,
|
||||
/* XXX some types missing */
|
||||
RDL_TYPE_UNKNOWN = 255
|
||||
} rdl_type;
|
||||
unsigned char rdl_path[PATH_MAX];
|
||||
} rd_loadobj_t;
|
||||
|
||||
typedef enum {
|
||||
RD_NONE = 0,
|
||||
RD_PREINIT,
|
||||
RD_POSTINIT,
|
||||
RD_DLACTIVITY
|
||||
} rd_event_e;
|
||||
|
||||
typedef enum {
|
||||
RD_NOTIFY_BPT,
|
||||
RD_NOTIFY_AUTOBPT,
|
||||
RD_NOTIFY_SYSCALL
|
||||
} rd_notify_e;
|
||||
|
||||
typedef struct rd_notify {
|
||||
rd_notify_e type;
|
||||
union {
|
||||
uintptr_t bptaddr;
|
||||
long syscallno;
|
||||
} u;
|
||||
} rd_notify_t;
|
||||
|
||||
typedef enum {
|
||||
RD_NOSTATE = 0,
|
||||
RD_CONSISTENT,
|
||||
RD_ADD,
|
||||
RD_DELETE
|
||||
} rd_state_e;
|
||||
|
||||
typedef struct rd_event_msg {
|
||||
rd_event_e type;
|
||||
union {
|
||||
rd_state_e state;
|
||||
} u;
|
||||
} rd_event_msg_t;
|
||||
|
||||
typedef enum {
|
||||
RD_RESOLVE_NONE,
|
||||
RD_RESOLVE_STEP,
|
||||
RD_RESOLVE_TARGET,
|
||||
RD_RESOLVE_TARGET_STEP
|
||||
} rd_skip_e;
|
||||
|
||||
typedef struct rd_plt_info {
|
||||
rd_skip_e pi_skip_method;
|
||||
long pi_nstep;
|
||||
uintptr_t pi_target;
|
||||
uintptr_t pi_baddr;
|
||||
unsigned int pi_flags;
|
||||
} rd_plt_info_t;
|
||||
|
||||
#define RD_FLG_PI_PLTBOUND 0x0001
|
||||
|
||||
__BEGIN_DECLS
|
||||
|
||||
struct proc_handle;
|
||||
void rd_delete(rd_agent_t *);
|
||||
const char *rd_errstr(rd_err_e);
|
||||
rd_err_e rd_event_addr(rd_agent_t *, rd_event_e, rd_notify_t *);
|
||||
rd_err_e rd_event_enable(rd_agent_t *, int);
|
||||
rd_err_e rd_event_getmsg(rd_agent_t *, rd_event_msg_t *);
|
||||
rd_err_e rd_init(int);
|
||||
typedef int rl_iter_f(const rd_loadobj_t *, void *);
|
||||
rd_err_e rd_loadobj_iter(rd_agent_t *, rl_iter_f *, void *);
|
||||
void rd_log(const int);
|
||||
rd_agent_t *rd_new(struct proc_handle *);
|
||||
rd_err_e rd_objpad_enable(rd_agent_t *, size_t);
|
||||
struct proc;
|
||||
rd_err_e rd_plt_resolution(rd_agent_t *, uintptr_t, struct proc *,
|
||||
uintptr_t, rd_plt_info_t *);
|
||||
rd_err_e rd_reset(rd_agent_t *);
|
||||
|
||||
__END_DECLS
|
||||
|
||||
#endif /* _RTLD_DB_H_ */
|
Loading…
Reference in New Issue
Block a user