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1034 lines
36 KiB
Bash
Executable File
1034 lines
36 KiB
Bash
Executable File
#!/bin/sh
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# A Poor(but Free)'s Man dtrace
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#
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# Copyright (C) 2014-2016 Free Software Foundation, Inc.
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#
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# Contributed by Oracle, Inc.
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#
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# This file is part of GDB.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see
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# <http://www.gnu.org/licenses/>.
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# DISCLAIMER DISCLAIMER DISCLAIMER
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# This script is a test tool. As such it is in no way intended to
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# replace the "real" dtrace command for any practical purpose, apart
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# from testing the DTrace USDT probes support in GDB.
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# that said...
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#
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# pdtrace is a limited dtrace program, implementing a subset of its
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# functionality:
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#
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# - The generation of an ELF file containing an embedded dtrace
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# program. Equivalent to dtrace -G.
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#
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# - The generation of a header file with definitions for static
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# probes. Equivalent to dtrace -h.
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#
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# This allows to generate DTrace static probes without having to use
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# the user-level DTrace components. The generated objects are 100%
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# compatible with DTrace and can be traced by the dtrace kernel module
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# like if they were generated by dtrace.
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#
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# Some of the known limitations of this implementation are:
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# - The input d-script must describe one provider, and only one.
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# - The "probe " directives in the d-file must not include argument
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# names, just the types. Thus something like `char *' is valid, but
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# `char *name' is not.
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# - The command line options must precede other arguments, since the
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# script uses the (more) portable getopts.
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# - Each probe header in the d-script must be contained in
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# a single line.
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# - strip -K removes the debugging information from the input object
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# file.
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# - The supported target platforms are i[3456]86 and x86_64.
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#
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# Please keep this code as portable as possible. Restrict yourself to
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# POSIX sh.
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# This script uses the following external programs, defined in
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# variables. Some of them are substituted by autoconf.
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TR=tr
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NM=@NM_TRANSFORM_NAME@
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EGREP=egrep
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SED=sed
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CUT=cut
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READELF=@READELF_TRANSFORM_NAME@
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SORT=sort
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EXPR=expr
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WC=wc
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UNIQ=uniq
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HEAD=head
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SEQ=seq
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AS=@GAS_TRANSFORM_NAME@
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STRIP=@STRIP_TRANSFORM_NAME@
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TRUE=true
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# Sizes for several DOF structures, in bytes.
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#
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# See linux/dtrace/dof.h for the definition of the referred
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# structures.
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dof_hdrsize=64 # sizeof(dtrace_dof_hdr)
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dof_secsize=32 # sizeof(dtrace_dof_sect)
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dof_probesize=48 # sizeof(dtrace_dof_probe)
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dof_providersize=44 # sizeof(dtrace_dof_provider)
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# Types for the several DOF sections.
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#
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# See linux/dtrace/dof_defines.h for a complete list of section types
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# along with their values.
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dof_sect_type_strtab=8
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dof_sect_type_provider=15
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dof_sect_type_probes=16
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dof_sect_type_prargs=17
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dof_sect_type_proffs=18
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dof_sect_type_prenoffs=26
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### Functions
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# Write a message to the standard error output and exit with an error
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# status.
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#
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# Arguments:
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# $1 error message.
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f_panic()
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{
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echo "error: $1" 1>&2; exit 1
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}
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# Write a usage message to the standard output and exit with an error
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# status.
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f_usage()
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{
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printf "Usage: pdtrace [-32|-64] [-GhV] [-o output] [-s script] [ args ... ]\n\n"
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printf "\t-32 generate 32-bit ELF files\n"
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printf "\t-64 generate 64-bit ELF files\n\n"
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printf "\t-G generate an ELF file containing embedded dtrace program\n"
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printf "\t-h generate a header file with definitions for static probes\n"
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printf "\t-o set output file\n"
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printf "\t-s handle probes according to the specified D script\n"
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printf "\t-V report the DTrace API version implemented by the tool\n"
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exit 2
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}
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# Write a version message to the standard output and exit with a
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# successful status.
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f_version()
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{
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echo "pdtrace: Sun D 1.6.3"
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exit
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}
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# Add a new record to a list and return it.
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#
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# Arguments:
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# $1 is the list.
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# $2 is the new record
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f_add_record()
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{
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rec=$1
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test -n "$rec" && \
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{ rec=$(printf %s\\n "$rec"; echo x); rec=${rec%x}; }
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printf %s "$rec$2"
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}
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# Collect the providers and probes information from the input object
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# file.
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#
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# This function sets the values of the following global variables.
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# The values are structured in records, each record in a line. The
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# fields of each record are separated in some cases by white
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# characters and in other cases by colon (:) characters.
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#
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# The type codes in the line format descriptors are:
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# S: string, D: decimal number
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#
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# probes
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# Regular probes and is-enabled probes.
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# TYPE(S) PROVIDER(S) NAME(S) OFFSET(D) BASE(D) BASE_SYM(S)
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# base_probes
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# Base probes, i.e. probes sharing provider, name and container.
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# PROVIDER(S) NAME(S) BASE(D) BASE_SYM(S)
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# providers
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# List of providers.
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# PROVIDER(S)
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# All the offsets are expressed in bytes.
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#
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# Input globals:
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# objfile
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# Output globals:
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# probes, base_probes, providers
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probes=
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base_probes=
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providers=
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probes_args=
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f_collect_probes()
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{
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# Probe points are function calls to undefined functions featuring
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# distinct names for both normal probes and is-enabled probes.
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PROBE_REGEX="(__dtrace_([a-zA-Z_]+)___([a-zA-Z_]+))"
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EPROBE_REGEX="(__dtraceenabled_([a-zA-Z_]+)___([a-zA-Z_]+))"
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while read type symbol provider name; do
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test -z "$type" && f_panic "No probe points found in $objfile"
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provider=$(printf %s $provider | $TR -s _)
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name=$(printf %s $name | $TR -s _)
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# Search the object file for relocations defined for the
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# probe symbols. Then calculate the base address of the
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# probe (along with the symbol associated with that base
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# address) and the offset of the probe point.
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for offset in $($READELF -W -r $objfile | $EGREP $symbol | $CUT -d' ' -f1)
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do
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# Figure out the base address for the probe. This is
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# done finding the function name in the text section of
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# the object file located above the probed point. But
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# note that the relocation is for the address operand of
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# the call instruction, so we have to subtract 1 to find
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# the real probed point.
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offset=$((0x$offset - 1))
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# The addresses of is-enabled probes must point to the
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# first NOP instruction in their patched instructions
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# sequences, so modify them (see f_patch_objfile for the
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# instruction sequences).
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if test "$type" = "e"; then
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if test "$objbits" -eq "32"; then
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offset=$((offset + 2))
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else # 64 bits
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offset=$((offset + 3))
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fi
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fi
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# Determine the base address of the probe and its
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# corresponding function name.
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funcs=$($NM -td $objfile | $EGREP "^[0-9]+ T " \
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| $CUT -d' ' -f1,3 | $SORT -n -r | $TR ' ' :)
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for fun in $funcs; do
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func_off=$(printf %s $fun | $CUT -d: -f1)
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func_sym=$(printf %s $fun | $CUT -d: -f2)
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# Note that `expr' is used to remove leading zeros
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# to avoid FUNC_OFF to be interpreted as an octal
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# number in arithmetic contexts.
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test "$func_off" -le "$offset" && \
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{ base=$($EXPR $func_off + 0); break; }
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done
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test -n "$base" || \
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f_panic "could not find base address for probe at $objfile($o)"
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# Emit the record for the probe.
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probes=$(f_add_record "$probes" \
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"$type $provider $name $(($offset - $base)) $base $func_sym")
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done
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done <<EOF
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$($NM $objfile | $EGREP " U $PROBE_REGEX" \
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| $SED -E -e "s/.*$PROBE_REGEX.*/p \1 \2 \3/";
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$NM $objfile | $EGREP " U $EPROBE_REGEX" \
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| $SED -E -e "s/.*$EPROBE_REGEX.*/e \1 \2 \3/")
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EOF
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# Build the list of providers and of base probes from the probes.
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while read type provider name offset base base_sym; do
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providers=$(f_add_record "$providers" "$provider")
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base_probes=$(f_add_record "$base_probes" "$provider $name $base $base_sym")
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done <<EOF
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$probes
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EOF
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providers=$(printf %s\\n "$providers" | $SORT | $UNIQ)
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base_probes=$(printf %s\\n "$base_probes" | $SORT | $UNIQ)
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}
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# Collect the argument counts and type strings for all the probes
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# described in the `probes' global variable. This is done by
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# inspecting the d-script file provided by the user.
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#
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# This function sets the values of the following global variables.
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# The values are structured in records, each record in a line. The
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# fields of each record are separated in some cases by white
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# characters and in other cases by colon (:) characters.
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#
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# The type codes in the line format descriptors are:
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# S: string, D: decimal number
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#
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# probes_args
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# Probes arguments.
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# PROVIDER(S):NAME(S):NARGS(D):ARG1(S):ARG2(S):...:ARGn(S)
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#
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# Input globals:
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# probes
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# Output globals:
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# probes_args
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# Arguments:
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# $1 is the d-script file from which to extract the arguments
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# information.
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f_collect_probes_args()
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{
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dscript=$1
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while read type provider name offset base base_sym; do
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# Process normal probes only. Is-enabled probes are not
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# described in the d-script file and they don't receive any
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# argument.
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test "$type" = "p" || continue
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# Names are mangled in d-script files to make it possible to
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# have underscore characters as part of the provider name and
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# probe name.
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m_provider=$(printf %s $provider | $SED -e 's/_/__/g')
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m_name=$(printf %s $name | $SED -e 's/_/__/g')
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# Ignore this probe if the d-script file does not describe its
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# provider.
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$EGREP -q "provider +$m_provider" $dscript || continue
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# Look for the line containing the description of the probe.
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# If we can't find it then ignore this probe.
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line=$($EGREP "^ *probe +$m_name *\(.*\);" $dscript)
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test -n "$line" || continue
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# Ok, extract the argument types from the probe prototype.
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# This is fragile as hell as it requires the prototype to be
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# in a single line.
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args=""; nargs=0; line=$(printf %s "$line" | $SED -e 's/.*(\(.*\)).*/\1/')
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set -f; IFS=,
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for arg in $line; do
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args="$args:$arg"
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nargs=$((nargs + 1))
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done
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set +f; unset IFS
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# Emit the record for the probe arguments.
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probes_args=$(f_add_record "$probes_args" "$provider:$name:$nargs$args")
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done <<EOF
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$probes
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EOF
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}
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# Functions to manipulate the global BCOUNT.
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BCOUNT=0
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f_incr_bcount()
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{
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BCOUNT=$((BCOUNT + $1))
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}
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f_align_bcount()
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{
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test $((BCOUNT % $1)) -eq 0 || BCOUNT=$((BCOUNT + ($1 - (BCOUNT % $1))))
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}
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# Generate a line of assembly code and add it to the asmprogram global
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# variable.
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#
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# Arguments:
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# $1 string to generate in a line.
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asmprogram=
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f_gen_asm()
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{
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line=$(printf "\t$1")
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asmprogram=$(f_add_record "$asmprogram" "$line")
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}
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# Helper function to generate the assembly code of a DOF section
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# header.
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#
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# This function is used by `f_gen_dof_program'.
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#
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# Arguments:
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# $1 is the name of the described section.
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# $2 is the type of the described section.
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# $3 is the alignment of the described section.
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# $4 is the number of entities stored in the described section.
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# $5 is the offset in the DOF program of the described section.
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# $6 is the size of the described section, in bytes.
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f_gen_dof_sect_header()
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{
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f_gen_asm ""
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f_gen_asm "/* dtrace_dof_sect for the $1 section. */"
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f_gen_asm ".balign 8"
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f_gen_asm ".4byte $2\t/* uint32_t dofs_type */"
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f_gen_asm ".4byte $3\t/* uint32_t dofs_align */"
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# The DOF_SECF_LOAD flag is 1 => loadable section.
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f_gen_asm ".4byte 1\t/* uint32_t dofs_flags */"
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f_gen_asm ".4byte $4\t/* uint32_t dofs_entsize */"
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f_gen_asm ".8byte $5\t/* uint64_t dofs_offset */"
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f_gen_asm ".8byte $6\t/* uint64_t dofs_size */"
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}
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# Generate a DOF program and assembly it in the output file.
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#
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# The DOF program generated by this function has the following
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# structure:
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#
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# HEADER
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# STRTAB OFFTAB EOFFTAB [PROBES PROVIDER]...
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# STRTAB_SECT OFFTAB_SECT EOFFTAB_SECT ARGTAB_SECT [PROBES_SECT PROVIDER_SECT]...
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#
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# Input globals:
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# probes, base_probes, providers, probes_args, BCOUNT
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f_gen_dof_program()
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{
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###### Variables used to cache information needed later.
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# Number of section headers in the generated DOF program.
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dof_secnum=0
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# Offset of section headers in the generated DOF program, in bytes.
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dof_secoff=0
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# Sizes of the STRTAB, OFFTAB and EOFFTAB sections, in bytes.
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strtab_size=0
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offtab_size=0
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eofftab_size=0
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# Offsets of the STRTAB, OFFTAB EOFFTAB and PROBES sections in the
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# generated DOF program. In bytes.
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strtab_offset=0
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offtab_offset=0
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eofftab_offset=0
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argtab_offset=0
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probes_offset=0
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# Indexes of the section headers of the STRTAB, OFFTAB, EOFFTAB and
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# PROBES sections in the sections array.
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strtab_sect_index=0
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offtab_sect_index=0
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eofftab_sect_index=0
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argtab_sect_index=0
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probes_sect_index=0
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# First offsets and eoffsets of the base-probes.
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# Lines: PROVIDER(S) NAME(S) BASE(D) (DOF_OFFSET(D)|DOF_EOFFSET(D))
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probes_dof_offsets=
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probes_dof_eoffsets=
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# Offsets in the STRTAB section for the first type of base probes.
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# Record per line: PROVIDER(S) NAME(S) BASE(D) OFFSET(D)
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probes_dof_types=
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# Offsets of the provider names in the provider's STRTAB section.
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# Lines: PROVIDER(S) OFFSET(D)
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providers_dof_names=
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# Offsets of the base-probe names in the provider's STRTAB section.
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# Lines: PROVIDER(S) NAME(S) BASE(D) OFFSET(D)
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probes_dof_names=
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# Offsets of the provider sections in the DOF program.
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# Lines: PROVIDER(S) OFFSET(D)
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providers_offsets=
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###### Generation phase.
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# The header of the DOF program contains a `struct
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# dtrace_dof_hdr'. Record its size, but it is written at the end
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# of the function.
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f_incr_bcount $dof_hdrsize; f_align_bcount 8
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# The STRTAB section immediately follows the header. It contains
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# the following set of packed null-terminated strings:
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#
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# [PROVIDER [BASE_PROBE_NAME [BASE_PROBE_ARG_TYPE...]]...]...
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strtab_offset=$BCOUNT
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strtab_sect_index=$dof_secnum
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dof_secnum=$((dof_secnum + 1))
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f_gen_asm ""
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f_gen_asm "/* The STRTAB section. */"
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f_gen_asm ".balign 8"
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# Add the provider names.
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off=0
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while read provider; do
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strtab_size=$(($strtab_size + ${#prov} + 1))
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# Note the funny mangling...
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f_gen_asm ".asciz \"$(printf %s $provider | $TR _ -)\""
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providers_dof_names=$(f_add_record "$providers_dof_names" \
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"$provider $off")
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off=$(($off + ${#provider} + 1))
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# Add the base-probe names.
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while read p_provider name base base_sym; do
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test "$p_provider" = "$provider" || continue
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# And yes, more funny mangling...
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f_gen_asm ".asciz \"$(printf %s $name | $TR _ -)\""
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probes_dof_names=$(f_add_record "$probes_dof_names" \
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"$p_provider $name $base $off")
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off=$(($off + ${#name} + 1))
|
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while read args; do
|
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a_provider=$(printf %s "$args" | $CUT -d: -f1)
|
|
a_name=$(printf %s "$args" | $CUT -d: -f2)
|
|
test "$a_provider" = "$p_provider" \
|
|
&& test "$a_name" = "$name" \
|
|
|| continue
|
|
|
|
probes_dof_types=$(f_add_record "$probes_dof_types" \
|
|
"$a_provider $name $base $off")
|
|
nargs=$(printf %s "$args" | $CUT -d: -f3)
|
|
for n in $($SEQ $nargs); do
|
|
arg=$(printf %s "$args" | $CUT -d: -f$(($n + 3)))
|
|
f_gen_asm ".asciz \"${arg}\""
|
|
off=$(($off + ${#arg} + 1))
|
|
done
|
|
done <<EOF
|
|
$probes_args
|
|
EOF
|
|
done <<EOF
|
|
$base_probes
|
|
EOF
|
|
done <<EOF
|
|
$providers
|
|
EOF
|
|
strtab_size=$off
|
|
f_incr_bcount $strtab_size; f_align_bcount 8
|
|
|
|
# The OFFTAB section contains a set of 32bit words, one per
|
|
# defined regular probe.
|
|
offtab_offset=$BCOUNT
|
|
offtab_sect_index=$dof_secnum
|
|
dof_secnum=$((dof_secnum + 1))
|
|
f_gen_asm ""
|
|
f_gen_asm "/* The OFFTAB section. */"
|
|
f_gen_asm ".balign 8"
|
|
off=0
|
|
while read type provider name offset base base_sym; do
|
|
test "$type" = "p" || continue
|
|
f_gen_asm ".4byte $offset\t/* probe ${provider}:${name} */"
|
|
probes_dof_offsets=$(f_add_record "$probes_dof_offsets" \
|
|
"$provider $name $base $off")
|
|
off=$(($off + 4))
|
|
done <<EOF
|
|
$probes
|
|
EOF
|
|
offtab_size=$off
|
|
f_incr_bcount $offtab_size; f_align_bcount 8
|
|
|
|
# The EOFFTAB section contains a set of 32bit words, one per
|
|
# defined is-enabled probe.
|
|
eofftab_offset=$BCOUNT
|
|
eofftab_sect_index=$dof_secnum
|
|
dof_secnum=$((dof_secnum + 1))
|
|
f_gen_asm ""
|
|
f_gen_asm "/* The EOFFTAB section. */"
|
|
f_gen_asm ".balign 8"
|
|
off=0
|
|
while read type provider name offset base base_sym; do
|
|
test "$type" = "e" || continue
|
|
f_gen_asm ".4byte $offset\t/* is-enabled probe ${provider}:${name} */"
|
|
probes_dof_eoffsets=$(f_add_record "$probes_dof_eoffsets" \
|
|
"$provider $name $base $off")
|
|
off=$(($off + 4))
|
|
done <<EOF
|
|
$probes
|
|
EOF
|
|
eofftab_size=$off
|
|
f_incr_bcount $eofftab_size; f_align_bcount 8
|
|
|
|
# The ARGTAB section is empty, but nonetheless has a section
|
|
# header, so record its section index here.
|
|
argtab_offset=0
|
|
argtab_sect_index=$dof_secnum
|
|
dof_secnum=$((dof_secnum + 1))
|
|
|
|
# Generate a pair of sections PROBES and PROVIDER for each
|
|
# provider.
|
|
while read prov; do
|
|
# The PROBES section contains an array of `struct
|
|
# dtrace_dof_probe'.
|
|
#
|
|
# A `dtrace_dof_probe' entry characterizes the collection of
|
|
# probes and is-enabled probes sharing the same provider, name and
|
|
# base address.
|
|
probes_sect_index=$dof_secnum
|
|
dof_secnum=$((dof_secnum + 1))
|
|
probes_offset=$BCOUNT
|
|
num_base_probes=$(printf %s\\n "$base_probes" | $WC -l)
|
|
while read provider name base base_sym; do
|
|
name_offset=$(printf %s\\n "$probes_dof_names" \
|
|
| $EGREP "^$provider $name " | $CUT -d' ' -f4)
|
|
|
|
num_offsets=$(printf %s\\n "$probes_dof_offsets" \
|
|
| $EGREP "^$provider $name [0-9]+ " | $WC -l)
|
|
|
|
first_offset=0
|
|
test "$num_offsets" -gt 0 && \
|
|
first_offset=$(printf %s\\n "$probes_dof_offsets" \
|
|
| $EGREP "^$provider $name " | $CUT -d' ' -f4 | $HEAD -1)
|
|
|
|
num_eoffsets=$(printf %s\\n "$probes_dof_eoffsets" \
|
|
| $EGREP "^$provider $name [0-9]+ " | $WC -l)
|
|
first_eoffset=0
|
|
test "$num_eoffsets" -gt 0 && \
|
|
first_eoffset=$(printf %s "$probes_dof_eoffsets" \
|
|
| $EGREP "^$provider $name " | $CUT -d' ' -f4 | $HEAD -1)
|
|
|
|
num_args=$(printf %s "$probes_args" \
|
|
| $EGREP "^$provider:$name:" | $CUT -d: -f3 | $HEAD -1)
|
|
|
|
first_type=$(printf %s "$probes_dof_types" \
|
|
| $EGREP "^$provider $name $base " | $CUT -d' ' -f4 | $HEAD -1)
|
|
|
|
reloctype=R_X86_64_GLOB_DAT
|
|
test "$objbits" = "32" && reloctype=R_386_32
|
|
|
|
f_gen_asm ""
|
|
f_gen_asm "/* dtrace_dof_probe for ${provider}:${name} at ${base_sym} */"
|
|
f_gen_asm ".balign 8"
|
|
f_gen_asm ".reloc ., $reloctype, $base_sym + 0"
|
|
f_gen_asm ".8byte ${base}\t/* uint64_t dofpr_addr */"
|
|
f_gen_asm ".4byte 0\t/* uint32_t dofpr_func */"
|
|
f_gen_asm ".4byte $name_offset\t/* uint32_t dofpr_name */"
|
|
f_gen_asm ".4byte $first_type\t/* uint32_t dofpr_nargv */"
|
|
f_gen_asm ".4byte 0\t/* uint32_t dofpr_xargv */"
|
|
f_gen_asm ".4byte 0\t/* uint32_t dofpr_argidx */"
|
|
f_gen_asm ".4byte $(($first_offset/4))\t/* uint32_t dofpr_offidx */"
|
|
f_gen_asm ".byte $num_args\t/* uint8_t dofpr_nargc */"
|
|
f_gen_asm ".byte 0\t/* uint8_t dofpr_xargc */"
|
|
f_gen_asm ".2byte $num_offsets\t/* uint16_t dofpr_noffs */"
|
|
f_gen_asm ".4byte $(($first_eoffset/4))\t/* uint32_t dofpr_enoffidx */"
|
|
f_gen_asm ".2byte $num_eoffsets\t/* uint16_t dofpr_nenoffs */"
|
|
f_gen_asm ".2byte 0\t/* uint16_t dofpr_pad1 */"
|
|
f_gen_asm ".4byte 0\t/* uint16_t dofpr_pad2 */"
|
|
|
|
f_incr_bcount "$dof_probesize"
|
|
done <<EOF
|
|
$base_probes
|
|
EOF
|
|
|
|
# The PROVIDER section contains a `struct dtrace_dof_provider'
|
|
# instance describing the provider for the probes above.
|
|
dof_secnum=$((dof_secnum + 1))
|
|
providers_offsets=$(f_add_record "$providers_offsets" \
|
|
"$prov $BCOUNT")
|
|
# The dtrace_dof_provider.
|
|
provider_name_offset=$(printf %s "$providers_dof_names" \
|
|
| $EGREP "^$prov " | $CUT -d' ' -f2)
|
|
|
|
f_gen_asm ""
|
|
f_gen_asm "/* dtrace_dof_provider for $prov */"
|
|
f_gen_asm ".balign 8"
|
|
# Links to several DOF sections.
|
|
f_gen_asm ".4byte $strtab_sect_index\t/* uint32_t dofpv_strtab */"
|
|
f_gen_asm ".4byte $probes_sect_index\t/* uint32_t dofpv_probes */"
|
|
f_gen_asm ".4byte $argtab_sect_index\t/* uint32_t dofpv_prargs */"
|
|
f_gen_asm ".4byte $offtab_sect_index\t/* uint32_t dofpv_proffs */"
|
|
# Offset of the provider name into the STRTAB section.
|
|
f_gen_asm ".4byte $provider_name_offset\t/* uint32_t dofpv_name */"
|
|
# The rest of fields can be 0 for our modest purposes :)
|
|
f_gen_asm ".4byte 0\t/* uint32_t dofpv_provattr */"
|
|
f_gen_asm ".4byte 0\t/* uint32_t dofpv_modattr */"
|
|
f_gen_asm ".4byte 0\t/* uint32_t dofpv_funcattr */"
|
|
f_gen_asm ".4byte 0\t/* uint32_t dofpv_nameattr */"
|
|
f_gen_asm ".4byte 0\t/* uint32_t dofpv_argsattr */"
|
|
# But not this one, of course...
|
|
f_gen_asm ".4byte $eofftab_sect_index\t/* uint32_t dofpv_prenoffs */"
|
|
|
|
f_incr_bcount $dof_providersize
|
|
done<<EOF
|
|
$providers
|
|
EOF
|
|
f_align_bcount 8
|
|
|
|
# The section headers follow, one per section defined above.
|
|
dof_secoff=$BCOUNT
|
|
|
|
f_gen_dof_sect_header STRTAB \
|
|
$dof_sect_type_strtab \
|
|
1 1 $strtab_offset $strtab_size
|
|
f_incr_bcount $dof_secsize; f_align_bcount 8
|
|
|
|
f_gen_dof_sect_header OFFTAB \
|
|
$dof_sect_type_proffs \
|
|
4 4 $offtab_offset $offtab_size
|
|
f_incr_bcount $dof_secsize; f_align_bcount 8
|
|
|
|
f_gen_dof_sect_header EOFFTAB \
|
|
$dof_sect_type_prenoffs \
|
|
4 4 $eofftab_offset $eofftab_size
|
|
f_incr_bcount $dof_secsize; f_align_bcount 8
|
|
|
|
f_gen_dof_sect_header ARGTAB \
|
|
$dof_sect_type_prargs \
|
|
4 1 $argtab_offset 0
|
|
f_incr_bcount $dof_secsize; f_align_bcount 8
|
|
|
|
while read provider; do
|
|
provider_offset=$(printf %s "$providers_offsets" \
|
|
| $EGREP "^$provider " | $CUT -d' ' -f2)
|
|
num_base_probes=$(printf %s\\n "$base_probes" | $WC -l)
|
|
|
|
f_gen_dof_sect_header "$provider probes" \
|
|
$dof_sect_type_probes \
|
|
8 $dof_probesize $probes_offset \
|
|
$((num_base_probes * dof_probesize))
|
|
f_incr_bcount $dof_secsize; f_align_bcount 8
|
|
|
|
f_gen_dof_sect_header "$provider provider" \
|
|
$dof_sect_type_provider \
|
|
8 1 $provider_offset $dof_providersize
|
|
f_incr_bcount $dof_secsize; f_align_bcount 8
|
|
done <<EOF
|
|
$providers
|
|
EOF
|
|
|
|
# Finally, cook the header.
|
|
asmbody="$asmprogram"
|
|
asmprogram=""
|
|
f_gen_asm "/* File generated by pdtrace. */"
|
|
f_gen_asm ""
|
|
|
|
f_gen_asm ".section .SUNW_dof,\"a\",\"progbits\""
|
|
f_gen_asm ".globl __SUNW_dof"
|
|
f_gen_asm ".hidden __SUNW_dof"
|
|
f_gen_asm ".size __SUNW_dof, ${BCOUNT}"
|
|
f_gen_asm ".type __SUNW_dof, @object"
|
|
f_gen_asm "__SUNW_dof:"
|
|
|
|
f_gen_asm ""
|
|
f_gen_asm "/* dtrace_dof_hdr */"
|
|
f_gen_asm ".balign 8"
|
|
f_gen_asm ".byte 0x7f, 'D, 'O, 'F\t/* dofh_ident[0..3] */"
|
|
f_gen_asm ".byte 2\t\t/* model: 1=ILP32, 2=LP64 */"
|
|
f_gen_asm ".byte 1\t\t/* encoding: 1: little-endian, 2: big-endian */"
|
|
f_gen_asm ".byte 2\t\t/* DOF version: 1 or 2. Latest is 2 */"
|
|
f_gen_asm ".byte 2\t\t/* DIF version: 1 or 2. Latest is 2 */"
|
|
f_gen_asm ".byte 8\t\t/* number of DIF integer registers */"
|
|
f_gen_asm ".byte 8\t\t/* number of DIF tuple registers */"
|
|
f_gen_asm ".byte 0, 0\t\t/* dofh_ident[10..11] */"
|
|
f_gen_asm ".4byte 0\t\t/* dofh_ident[12..15] */"
|
|
f_gen_asm ".4byte 0\t/* uint32_t dofh_flags */" # See Limitations above.
|
|
f_gen_asm ".4byte ${dof_hdrsize}\t/* uint32_t dofh_hdrsize */"
|
|
f_gen_asm ".4byte ${dof_secsize}\t/* uint32_t dofh_secsize */"
|
|
f_gen_asm ".4byte ${dof_secnum}\t/* uint32_t dofh_secnum */"
|
|
f_gen_asm ".8byte ${dof_secoff}\t/* uint64_t dofh_secoff */"
|
|
f_gen_asm ".8byte ${BCOUNT}\t/* uint64_t dofh_loadsz */"
|
|
f_gen_asm ".8byte ${BCOUNT}\t/* uint64_t dofh_filesz */"
|
|
f_gen_asm ".8byte 0\t/* uint64_t dofh_pad */"
|
|
f_gen_asm ""
|
|
|
|
# Ok, now assembly the program in OFILE
|
|
echo "$asmprogram$asmbody" | $AS -$objbits -o $ofile
|
|
|
|
# Next step is to change the sh_type of the ".SUNW_dof" section
|
|
# headers to 0x6ffffff4 (SHT_SUNW_dof).
|
|
#
|
|
# Note that this code relies in the fact that readelf will list
|
|
# the sections ordered in the same order than the section headers
|
|
# in the section header table of the file.
|
|
elfinfo=$($READELF -a $ofile)
|
|
|
|
# Mind the endianness.
|
|
if printf %s "$elfinfo" | $EGREP -q "little endian"; then
|
|
sht_sunw_dof=$(printf %s%s%s%s \\364 \\377 \\377 \\157)
|
|
else
|
|
sht_sunw_dof=$(printf %s%s%s%s \\157 \\377 \\377 \\364)
|
|
fi
|
|
|
|
shdr_start=$(printf %s "$elfinfo" \
|
|
| $EGREP "^[ \t]*Start of section headers:" \
|
|
| $SED -E -e 's/.*headers:[ \t]*([0-9]+).*/\1/')
|
|
test -n "$shdr_start" \
|
|
|| f_panic "could not extract the start of shdr from $ofile"
|
|
|
|
shdr_num_entries=$(printf %s "$elfinfo" \
|
|
| $EGREP "^[ \t]*Size of section headers:" \
|
|
| $SED -E -e 's/.*headers:[ \t]*([0-9]+).*/\1/')
|
|
test -n "$shdr_num_entries" \
|
|
|| f_panic "could not extract the number of shdr entries from $ofile"
|
|
|
|
shdr_entry_size=$(printf %s "$elfinfo" \
|
|
| $EGREP "^[ \t]*Size of section headers:" \
|
|
| $SED -E -e 's/.*headers:[ \t]*([0-9]+).*/\1/')
|
|
test -n "$shdr_entry_size" \
|
|
|| f_panic "could not fetch the size of section headers from $ofile"
|
|
|
|
while read line; do
|
|
data=$(printf %s "$line" \
|
|
| $SED -E -e 's/.*\[(.*)\][ \t]+([a-zA-Z_.]+).*/\1:\2/')
|
|
num=$(printf %s "$data" | $CUT -d: -f1)
|
|
name=$(printf %s "$data" | $CUT -d: -f2)
|
|
if test "$name" = ".SUNW_dof"; then
|
|
# Patch the new sh_type in the proper entry of the section
|
|
# header table.
|
|
printf "$sht_sunw_dof" \
|
|
| dd of=$ofile conv=notrunc count=4 ibs=1 bs=1 \
|
|
seek=$((shdr_start + (shdr_entry_size * num) + 4)) \
|
|
2> /dev/null
|
|
break
|
|
fi
|
|
done <<EOF
|
|
$(printf %s "$elfinfo" | $EGREP "^[ \t]*\[[0-9 ]+\].*[A-Z]+.*PROGBITS")
|
|
EOF
|
|
|
|
}
|
|
|
|
# Patch the probed points in the given object file, replacing the
|
|
# function calls with NOPs.
|
|
#
|
|
# The probed points in the input object files are function calls.
|
|
# This function replaces these function calls by some other
|
|
# instruction sequences. Which replacement to use depends on several
|
|
# factors, as documented below.
|
|
#
|
|
# Arguments:
|
|
# $1 is the object file to patch.
|
|
|
|
f_patch_objfile()
|
|
{
|
|
objfile=$1
|
|
|
|
# Several x86_64 instruction opcodes, in octal.
|
|
x86_op_nop=$(printf \\220)
|
|
x86_op_ret=$(printf \\303)
|
|
x86_op_call=$(printf \\350)
|
|
x86_op_jmp32=$(printf \\351)
|
|
x86_op_rex_rax=$(printf \\110)
|
|
x86_op_xor_eax_0=$(printf \\063)
|
|
x86_op_xor_eax_1=$(printf \\300)
|
|
|
|
# Figure out the file offset of the text section in the object
|
|
# file.
|
|
text_off=0x$(objdump -j .text -h $objfile \
|
|
| grep \.text | $TR -s ' ' | $CUT -d' ' -f 7)
|
|
|
|
while read type provider name offset base base_sym; do
|
|
# Calculate the offset of the probed point in the object file.
|
|
# Note that the `offset' of is-enabled probes is tweaked in
|
|
# `f_collect_probes" to point ahead the patching point.
|
|
probe_off=$((text_off + base + offset))
|
|
if test "$type" = "e"; then
|
|
if test "$objbits" -eq "32"; then
|
|
probe_off=$((probe_off - 2))
|
|
else # 64 bits
|
|
probe_off=$((probe_off - 3))
|
|
fi
|
|
fi
|
|
|
|
# The probed point can be either a CALL instruction or a JMP
|
|
# instruction (a tail call). This has an impact on the
|
|
# patching sequence. Fetch the first byte at the probed point
|
|
# and do the right thing.
|
|
nopret="$x86_op_nop"
|
|
byte=$(dd if=$objfile count=1 ibs=1 bs=1 skip=$probe_off 2> /dev/null)
|
|
test "$byte" = "$x86_op_jmp32" && nopret="$x86_op_ret"
|
|
|
|
# Determine the patching sequence. It depends on the type of
|
|
# probe at hand (regular or is-enabled) and also if
|
|
# manipulating a 32bit or 64bit binary.
|
|
patchseq=
|
|
case $type in
|
|
p) patchseq=$(printf %s%s%s%s%s \
|
|
"$nopret" \
|
|
"$x86_op_nop" \
|
|
"$x86_op_nop" \
|
|
"$x86_op_nop" \
|
|
"$x86_op_nop")
|
|
;;
|
|
e) test "$objbits" -eq 64 && \
|
|
patchseq=$(printf %s%s%s%s%s \
|
|
"$x86_op_rex_rax" \
|
|
"$x86_op_xor_eax_0" \
|
|
"$x86_op_xor_eax_1" \
|
|
"$nopret" \
|
|
"$x86_op_nop")
|
|
test "$objbits" -eq 32 && \
|
|
patchseq=$(printf %s%s%s%s%s \
|
|
"$x86_op_xor_eax_0" \
|
|
"$x86_op_xor_eax_1" \
|
|
"$nopret" \
|
|
"$x86_op_nop" \
|
|
"$x86_op_nop")
|
|
;;
|
|
*) f_panic "internal error: wrong probe type $type";;
|
|
esac
|
|
|
|
# Patch!
|
|
printf %s "$patchseq" \
|
|
| dd of=$objfile conv=notrunc count=5 ibs=1 bs=1 seek=$probe_off 2> /dev/null
|
|
done <<EOF
|
|
$probes
|
|
EOF
|
|
|
|
# Finally, we have to remove the __dtrace_* and __dtraceenabled_*
|
|
# symbols from the object file, along with their respective
|
|
# relocations.
|
|
#
|
|
# Note that the most obvious call:
|
|
# strip -v -N whatever -w foo.o
|
|
# will not work:
|
|
# strip: not stripping symbol `whatever' because it is named in a relocation
|
|
#
|
|
# Fortunately using `-K !whatever' instead tricks strip to do the
|
|
# right thing, but this is black magic and may eventually stop
|
|
# working...
|
|
$STRIP -K '!__dtrace_*' -w $objfile
|
|
$STRIP -K '!__dtraceenabled_*' -w $objfile
|
|
}
|
|
|
|
# Read the input .d file and print a header file with macros to
|
|
# invoke the probes defined in it.
|
|
|
|
f_gen_header_file()
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{
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guard=$(basename $ofile | $TR - _ | $CUT -d. -f1 | $TR a-z A-Z)
|
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printf "/*\n * Generated by pdtrace.\n */\n\n"
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|
|
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printf "#ifndef _${guard}_H\n"
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printf "#define _${guard}_H\n\n"
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|
|
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printf "#include <unistd.h>\n"
|
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printf "#include <inttypes.h>\n"
|
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printf \\n\\n
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|
|
|
printf "#ifdef __cplusplus\nextern \"C\" {\n#endif\n"
|
|
|
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printf "#define _DTRACE_VERSION 1\n\n"
|
|
|
|
provider=$(cat $dfile | $EGREP "^ *provider +([a-zA-Z_]+)" \
|
|
| $SED -E -e 's/^ *provider +([a-zA-Z]+).*/\1/')
|
|
test -z "$provider" \
|
|
&& f_panic "unable to parse the provider name from $dfile."
|
|
u_provider=$(printf %s "$provider" | $TR a-z A-Z | $TR -s _)
|
|
|
|
cat $dfile | $EGREP "^ *probe +[a-zA-Z_]+ *\(.*\);" | \
|
|
while read line; do
|
|
# Extract the probe name.
|
|
name=$(printf %s "$line" \
|
|
| $SED -E -e 's/^ *probe +([a-zA-Z_]+).*/\1/')
|
|
u_name=$(printf %s "$name" | $TR a-z A-Z | $TR -s _)
|
|
|
|
# Generate an arg1,arg2,...,argN line for the probe.
|
|
args=""; nargs=0; aline=$(printf %s "$line" | $SED -e 's/.*(\(.*\)).*/\1/')
|
|
set -f; IFS=,
|
|
for arg in $aline; do
|
|
args="${args}arg${nargs},"
|
|
nargs=$((nargs + 1))
|
|
done
|
|
set +f; unset IFS
|
|
args=${args%,}
|
|
|
|
echo "#if _DTRACE_VERSION"
|
|
echo ""
|
|
|
|
# Emit the macros for the probe.
|
|
echo "#define ${u_provider}_${u_name}($args) \\"
|
|
echo " __dtrace_${provider}___${name}($args)"
|
|
echo "#define ${u_provider}_${u_name}_ENABLED() \\"
|
|
echo " __dtraceenabled_${provider}___${name}()"
|
|
|
|
# Emit the extern definitions for the probe dummy
|
|
# functions.
|
|
echo ""
|
|
printf %s\\n "$line" \
|
|
| $SED -E -e "s/^ *probe +/extern void __dtrace_${provider}___/"
|
|
echo "extern int __dtraceenabled_${provider}___${name}(void);"
|
|
|
|
|
|
printf "\n#else\n"
|
|
|
|
# Emit empty macros for the probe
|
|
echo "#define ${u_provider}_${u_name}($args)"
|
|
echo "#define ${u_provider}_${u_name}_ENABLED() (0)"
|
|
|
|
printf "\n#endif /* _DTRACE_VERSION */\n"
|
|
done
|
|
|
|
printf "#ifdef __cplusplus\n}\n#endif\n\n"
|
|
printf "#endif /* _${guard}_H */\n"
|
|
}
|
|
|
|
### Main program.
|
|
|
|
# Process command line arguments.
|
|
|
|
test "$#" -eq "0" && f_usage
|
|
|
|
genelf=0
|
|
genheader=0
|
|
objbits=64
|
|
ofile=
|
|
dfile=
|
|
while getopts VG3264hs:o: name; do
|
|
case $name in
|
|
V) f_version;;
|
|
s) dfile="$OPTARG";
|
|
test -f "$dfile" || f_panic "cannot read $dfile";;
|
|
o) ofile="$OPTARG";;
|
|
G) genelf=1;;
|
|
h) genheader=1;;
|
|
# Note the trick to support -32
|
|
3) objbits=666;;
|
|
2) test "$objbits" -eq 666 || f_usage; objbits=32;;
|
|
# Likewise for -64
|
|
6) objbits=777;;
|
|
4) test "$objbits" -eq 777 || f_usage; objbits=64;;
|
|
?) f_usage;;
|
|
esac
|
|
done
|
|
shift $(($OPTIND - 1))
|
|
|
|
test "$objbits" -eq "32" || test "$objbits" -eq "64" \
|
|
|| f_usage
|
|
|
|
test $((genelf + genheader)) -gt 1 && \
|
|
{ echo "Please use either -G or -h."; f_usage; }
|
|
|
|
test -n "$dfile" || { echo "Please specify a .d file with -s."; exit 2; }
|
|
|
|
if test "$genelf" -gt 0; then
|
|
# In this mode there must be a remaining argument: the name of the
|
|
# object file to inspect for probed points.
|
|
test "$#" -ne "1" && f_usage
|
|
test -f "$1" || f_panic "cannot read $1"
|
|
objfile=$1
|
|
|
|
# Collect probe information from the input object file and the
|
|
# d-script.
|
|
f_collect_probes $objfile
|
|
f_collect_probes_args $dfile
|
|
|
|
# Generate the assembly code and assemble the DOF program in
|
|
# OFILE. Then patch OBJFILE to remove the dummy probe calls.
|
|
f_gen_dof_program
|
|
f_patch_objfile $objfile
|
|
fi
|
|
|
|
if test "$genheader" -gt 0; then
|
|
test -n "$ofile" || { echo "Please specify an output file with -o."; exit 2; }
|
|
|
|
# In this mode no extra arguments shall be present.
|
|
test "$#" -ne "0" && f_usage
|
|
|
|
f_gen_header_file > $ofile
|
|
fi
|
|
|
|
# pdtrace ends here.
|