diff options
Diffstat (limited to 'ANDROID_3.4.5/scripts/recordmcount.pl')
| -rwxr-xr-x | ANDROID_3.4.5/scripts/recordmcount.pl | 599 |
1 files changed, 0 insertions, 599 deletions
diff --git a/ANDROID_3.4.5/scripts/recordmcount.pl b/ANDROID_3.4.5/scripts/recordmcount.pl deleted file mode 100755 index 858966ab..00000000 --- a/ANDROID_3.4.5/scripts/recordmcount.pl +++ /dev/null @@ -1,599 +0,0 @@ -#!/usr/bin/perl -w -# (c) 2008, Steven Rostedt <srostedt@redhat.com> -# Licensed under the terms of the GNU GPL License version 2 -# -# recordmcount.pl - makes a section called __mcount_loc that holds -# all the offsets to the calls to mcount. -# -# -# What we want to end up with this is that each object file will have a -# section called __mcount_loc that will hold the list of pointers to mcount -# callers. After final linking, the vmlinux will have within .init.data the -# list of all callers to mcount between __start_mcount_loc and __stop_mcount_loc. -# Later on boot up, the kernel will read this list, save the locations and turn -# them into nops. When tracing or profiling is later enabled, these locations -# will then be converted back to pointers to some function. -# -# This is no easy feat. This script is called just after the original -# object is compiled and before it is linked. -# -# When parse this object file using 'objdump', the references to the call -# sites are offsets from the section that the call site is in. Hence, all -# functions in a section that has a call site to mcount, will have the -# offset from the beginning of the section and not the beginning of the -# function. -# -# But where this section will reside finally in vmlinx is undetermined at -# this point. So we can't use this kind of offsets to record the final -# address of this call site. -# -# The trick is to change the call offset referring the start of a section to -# referring a function symbol in this section. During the link step, 'ld' will -# compute the final address according to the information we record. -# -# e.g. -# -# .section ".sched.text", "ax" -# [...] -# func1: -# [...] -# call mcount (offset: 0x10) -# [...] -# ret -# .globl fun2 -# func2: (offset: 0x20) -# [...] -# [...] -# ret -# func3: -# [...] -# call mcount (offset: 0x30) -# [...] -# -# Both relocation offsets for the mcounts in the above example will be -# offset from .sched.text. If we choose global symbol func2 as a reference and -# make another file called tmp.s with the new offsets: -# -# .section __mcount_loc -# .quad func2 - 0x10 -# .quad func2 + 0x10 -# -# We can then compile this tmp.s into tmp.o, and link it back to the original -# object. -# -# In our algorithm, we will choose the first global function we meet in this -# section as the reference. But this gets hard if there is no global functions -# in this section. In such a case we have to select a local one. E.g. func1: -# -# .section ".sched.text", "ax" -# func1: -# [...] -# call mcount (offset: 0x10) -# [...] -# ret -# func2: -# [...] -# call mcount (offset: 0x20) -# [...] -# .section "other.section" -# -# If we make the tmp.s the same as above, when we link together with -# the original object, we will end up with two symbols for func1: -# one local, one global. After final compile, we will end up with -# an undefined reference to func1 or a wrong reference to another global -# func1 in other files. -# -# Since local objects can reference local variables, we need to find -# a way to make tmp.o reference the local objects of the original object -# file after it is linked together. To do this, we convert func1 -# into a global symbol before linking tmp.o. Then after we link tmp.o -# we will only have a single symbol for func1 that is global. -# We can convert func1 back into a local symbol and we are done. -# -# Here are the steps we take: -# -# 1) Record all the local and weak symbols by using 'nm' -# 2) Use objdump to find all the call site offsets and sections for -# mcount. -# 3) Compile the list into its own object. -# 4) Do we have to deal with local functions? If not, go to step 8. -# 5) Make an object that converts these local functions to global symbols -# with objcopy. -# 6) Link together this new object with the list object. -# 7) Convert the local functions back to local symbols and rename -# the result as the original object. -# 8) Link the object with the list object. -# 9) Move the result back to the original object. -# - -use strict; - -my $P = $0; -$P =~ s@.*/@@g; - -my $V = '0.1'; - -if ($#ARGV != 11) { - print "usage: $P arch endian bits objdump objcopy cc ld nm rm mv is_module inputfile\n"; - print "version: $V\n"; - exit(1); -} - -my ($arch, $endian, $bits, $objdump, $objcopy, $cc, - $ld, $nm, $rm, $mv, $is_module, $inputfile) = @ARGV; - -# This file refers to mcount and shouldn't be ftraced, so lets' ignore it -if ($inputfile =~ m,kernel/trace/ftrace\.o$,) { - exit(0); -} - -# Acceptable sections to record. -my %text_sections = ( - ".text" => 1, - ".ref.text" => 1, - ".sched.text" => 1, - ".spinlock.text" => 1, - ".irqentry.text" => 1, - ".kprobes.text" => 1, - ".text.unlikely" => 1, -); - -# Note: we are nice to C-programmers here, thus we skip the '||='-idiom. -$objdump = 'objdump' if (!$objdump); -$objcopy = 'objcopy' if (!$objcopy); -$cc = 'gcc' if (!$cc); -$ld = 'ld' if (!$ld); -$nm = 'nm' if (!$nm); -$rm = 'rm' if (!$rm); -$mv = 'mv' if (!$mv); - -#print STDERR "running: $P '$arch' '$objdump' '$objcopy' '$cc' '$ld' " . -# "'$nm' '$rm' '$mv' '$inputfile'\n"; - -my %locals; # List of local (static) functions -my %weak; # List of weak functions -my %convert; # List of local functions used that needs conversion - -my $type; -my $local_regex; # Match a local function (return function) -my $weak_regex; # Match a weak function (return function) -my $section_regex; # Find the start of a section -my $function_regex; # Find the name of a function - # (return offset and func name) -my $mcount_regex; # Find the call site to mcount (return offset) -my $mcount_adjust; # Address adjustment to mcount offset -my $alignment; # The .align value to use for $mcount_section -my $section_type; # Section header plus possible alignment command -my $can_use_local = 0; # If we can use local function references - -# Shut up recordmcount if user has older objcopy -my $quiet_recordmcount = ".tmp_quiet_recordmcount"; -my $print_warning = 1; -$print_warning = 0 if ( -f $quiet_recordmcount); - -## -# check_objcopy - whether objcopy supports --globalize-symbols -# -# --globalize-symbols came out in 2.17, we must test the version -# of objcopy, and if it is less than 2.17, then we can not -# record local functions. -sub check_objcopy -{ - open (IN, "$objcopy --version |") or die "error running $objcopy"; - while (<IN>) { - if (/objcopy.*\s(\d+)\.(\d+)/) { - $can_use_local = 1 if ($1 > 2 || ($1 == 2 && $2 >= 17)); - last; - } - } - close (IN); - - if (!$can_use_local && $print_warning) { - print STDERR "WARNING: could not find objcopy version or version " . - "is less than 2.17.\n" . - "\tLocal function references are disabled.\n"; - open (QUIET, ">$quiet_recordmcount"); - printf QUIET "Disables the warning from recordmcount.pl\n"; - close QUIET; - } -} - -if ($arch =~ /(x86(_64)?)|(i386)/) { - if ($bits == 64) { - $arch = "x86_64"; - } else { - $arch = "i386"; - } -} - -# -# We base the defaults off of i386, the other archs may -# feel free to change them in the below if statements. -# -$local_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)"; -$weak_regex = "^[0-9a-fA-F]+\\s+([wW])\\s+(\\S+)"; -$section_regex = "Disassembly of section\\s+(\\S+):"; -$function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; -$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$"; -$section_type = '@progbits'; -$mcount_adjust = 0; -$type = ".long"; - -if ($arch eq "x86_64") { - $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount([+-]0x[0-9a-zA-Z]+)?\$"; - $type = ".quad"; - $alignment = 8; - $mcount_adjust = -1; - - # force flags for this arch - $ld .= " -m elf_x86_64"; - $objdump .= " -M x86-64"; - $objcopy .= " -O elf64-x86-64"; - $cc .= " -m64"; - -} elsif ($arch eq "i386") { - $alignment = 4; - $mcount_adjust = -1; - - # force flags for this arch - $ld .= " -m elf_i386"; - $objdump .= " -M i386"; - $objcopy .= " -O elf32-i386"; - $cc .= " -m32"; - -} elsif ($arch eq "s390" && $bits == 32) { - $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_390_32\\s+_mcount\$"; - $mcount_adjust = -4; - $alignment = 4; - $ld .= " -m elf_s390"; - $cc .= " -m31"; - -} elsif ($arch eq "s390" && $bits == 64) { - $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_390_(PC|PLT)32DBL\\s+_mcount\\+0x2\$"; - $mcount_adjust = -8; - $alignment = 8; - $type = ".quad"; - $ld .= " -m elf64_s390"; - $cc .= " -m64"; - -} elsif ($arch eq "sh") { - $alignment = 2; - - # force flags for this arch - $ld .= " -m shlelf_linux"; - $objcopy .= " -O elf32-sh-linux"; - $cc .= " -m32"; - -} elsif ($arch eq "powerpc") { - $local_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\.?\\S+)"; - $function_regex = "^([0-9a-fA-F]+)\\s+<(\\.?.*?)>:"; - $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s\\.?_mcount\$"; - - if ($bits == 64) { - $type = ".quad"; - } - -} elsif ($arch eq "arm") { - $alignment = 2; - $section_type = '%progbits'; - $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_ARM_(CALL|PC24|THM_CALL)" . - "\\s+(__gnu_mcount_nc|mcount)\$"; - -} elsif ($arch eq "ia64") { - $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$"; - $type = "data8"; - - if ($is_module eq "0") { - $cc .= " -mconstant-gp"; - } -} elsif ($arch eq "sparc64") { - # In the objdump output there are giblets like: - # 0000000000000000 <igmp_net_exit-0x18>: - # As there's some data blobs that get emitted into the - # text section before the first instructions and the first - # real symbols. We don't want to match that, so to combat - # this we use '\w' so we'll match just plain symbol names, - # and not those that also include hex offsets inside of the - # '<>' brackets. Actually the generic function_regex setting - # could safely use this too. - $function_regex = "^([0-9a-fA-F]+)\\s+<(\\w*?)>:"; - - # Sparc64 calls '_mcount' instead of plain 'mcount'. - $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$"; - - $alignment = 8; - $type = ".xword"; - $ld .= " -m elf64_sparc"; - $cc .= " -m64"; - $objcopy .= " -O elf64-sparc"; -} elsif ($arch eq "mips") { - # To enable module support, we need to enable the -mlong-calls option - # of gcc for module, after using this option, we can not get the real - # offset of the calling to _mcount, but the offset of the lui - # instruction or the addiu one. herein, we record the address of the - # first one, and then we can replace this instruction by a branch - # instruction to jump over the profiling function to filter the - # indicated functions, or swith back to the lui instruction to trace - # them, which means dynamic tracing. - # - # c: 3c030000 lui v1,0x0 - # c: R_MIPS_HI16 _mcount - # c: R_MIPS_NONE *ABS* - # c: R_MIPS_NONE *ABS* - # 10: 64630000 daddiu v1,v1,0 - # 10: R_MIPS_LO16 _mcount - # 10: R_MIPS_NONE *ABS* - # 10: R_MIPS_NONE *ABS* - # 14: 03e0082d move at,ra - # 18: 0060f809 jalr v1 - # - # for the kernel: - # - # 10: 03e0082d move at,ra - # 14: 0c000000 jal 0 <loongson_halt> - # 14: R_MIPS_26 _mcount - # 14: R_MIPS_NONE *ABS* - # 14: R_MIPS_NONE *ABS* - # 18: 00020021 nop - if ($is_module eq "0") { - $mcount_regex = "^\\s*([0-9a-fA-F]+): R_MIPS_26\\s+_mcount\$"; - } else { - $mcount_regex = "^\\s*([0-9a-fA-F]+): R_MIPS_HI16\\s+_mcount\$"; - } - $objdump .= " -Melf-trad".$endian."mips "; - - if ($endian eq "big") { - $endian = " -EB "; - $ld .= " -melf".$bits."btsmip"; - } else { - $endian = " -EL "; - $ld .= " -melf".$bits."ltsmip"; - } - - $cc .= " -mno-abicalls -fno-pic -mabi=" . $bits . $endian; - $ld .= $endian; - - if ($bits == 64) { - $function_regex = - "^([0-9a-fA-F]+)\\s+<(.|[^\$]L.*?|\$[^L].*?|[^\$][^L].*?)>:"; - $type = ".dword"; - } -} elsif ($arch eq "microblaze") { - # Microblaze calls '_mcount' instead of plain 'mcount'. - $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$"; -} elsif ($arch eq "blackfin") { - $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s__mcount\$"; - $mcount_adjust = -4; -} else { - die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD"; -} - -my $text_found = 0; -my $read_function = 0; -my $opened = 0; -my $mcount_section = "__mcount_loc"; - -my $dirname; -my $filename; -my $prefix; -my $ext; - -if ($inputfile =~ m,^(.*)/([^/]*)$,) { - $dirname = $1; - $filename = $2; -} else { - $dirname = "."; - $filename = $inputfile; -} - -if ($filename =~ m,^(.*)(\.\S),) { - $prefix = $1; - $ext = $2; -} else { - $prefix = $filename; - $ext = ""; -} - -my $mcount_s = $dirname . "/.tmp_mc_" . $prefix . ".s"; -my $mcount_o = $dirname . "/.tmp_mc_" . $prefix . ".o"; - -check_objcopy(); - -# -# Step 1: find all the local (static functions) and weak symbols. -# 't' is local, 'w/W' is weak -# -open (IN, "$nm $inputfile|") || die "error running $nm"; -while (<IN>) { - if (/$local_regex/) { - $locals{$1} = 1; - } elsif (/$weak_regex/) { - $weak{$2} = $1; - } -} -close(IN); - -my @offsets; # Array of offsets of mcount callers -my $ref_func; # reference function to use for offsets -my $offset = 0; # offset of ref_func to section beginning - -## -# update_funcs - print out the current mcount callers -# -# Go through the list of offsets to callers and write them to -# the output file in a format that can be read by an assembler. -# -sub update_funcs -{ - return unless ($ref_func and @offsets); - - # Sanity check on weak function. A weak function may be overwritten by - # another function of the same name, making all these offsets incorrect. - if (defined $weak{$ref_func}) { - die "$inputfile: ERROR: referencing weak function" . - " $ref_func for mcount\n"; - } - - # is this function static? If so, note this fact. - if (defined $locals{$ref_func}) { - - # only use locals if objcopy supports globalize-symbols - if (!$can_use_local) { - return; - } - $convert{$ref_func} = 1; - } - - # Loop through all the mcount caller offsets and print a reference - # to the caller based from the ref_func. - if (!$opened) { - open(FILE, ">$mcount_s") || die "can't create $mcount_s\n"; - $opened = 1; - print FILE "\t.section $mcount_section,\"a\",$section_type\n"; - print FILE "\t.align $alignment\n" if (defined($alignment)); - } - foreach my $cur_offset (@offsets) { - printf FILE "\t%s %s + %d\n", $type, $ref_func, $cur_offset - $offset; - } -} - -# -# Step 2: find the sections and mcount call sites -# -open(IN, "$objdump -hdr $inputfile|") || die "error running $objdump"; - -my $text; - - -# read headers first -my $read_headers = 1; - -while (<IN>) { - - if ($read_headers && /$mcount_section/) { - # - # Somehow the make process can execute this script on an - # object twice. If it does, we would duplicate the mcount - # section and it will cause the function tracer self test - # to fail. Check if the mcount section exists, and if it does, - # warn and exit. - # - print STDERR "ERROR: $mcount_section already in $inputfile\n" . - "\tThis may be an indication that your build is corrupted.\n" . - "\tDelete $inputfile and try again. If the same object file\n" . - "\tstill causes an issue, then disable CONFIG_DYNAMIC_FTRACE.\n"; - exit(-1); - } - - # is it a section? - if (/$section_regex/) { - $read_headers = 0; - - # Only record text sections that we know are safe - $read_function = defined($text_sections{$1}); - # print out any recorded offsets - update_funcs(); - - # reset all markers and arrays - $text_found = 0; - undef($ref_func); - undef(@offsets); - - # section found, now is this a start of a function? - } elsif ($read_function && /$function_regex/) { - $text_found = 1; - $text = $2; - - # if this is either a local function or a weak function - # keep looking for functions that are global that - # we can use safely. - if (!defined($locals{$text}) && !defined($weak{$text})) { - $ref_func = $text; - $read_function = 0; - $offset = hex $1; - } else { - # if we already have a function, and this is weak, skip it - if (!defined($ref_func) && !defined($weak{$text}) && - # PPC64 can have symbols that start with .L and - # gcc considers these special. Don't use them! - $text !~ /^\.L/) { - $ref_func = $text; - $offset = hex $1; - } - } - } - # is this a call site to mcount? If so, record it to print later - if ($text_found && /$mcount_regex/) { - push(@offsets, (hex $1) + $mcount_adjust); - } -} - -# dump out anymore offsets that may have been found -update_funcs(); - -# If we did not find any mcount callers, we are done (do nothing). -if (!$opened) { - exit(0); -} - -close(FILE); - -# -# Step 3: Compile the file that holds the list of call sites to mcount. -# -`$cc -o $mcount_o -c $mcount_s`; - -my @converts = keys %convert; - -# -# Step 4: Do we have sections that started with local functions? -# -if ($#converts >= 0) { - my $globallist = ""; - my $locallist = ""; - - foreach my $con (@converts) { - $globallist .= " --globalize-symbol $con"; - $locallist .= " --localize-symbol $con"; - } - - my $globalobj = $dirname . "/.tmp_gl_" . $filename; - my $globalmix = $dirname . "/.tmp_mx_" . $filename; - - # - # Step 5: set up each local function as a global - # - `$objcopy $globallist $inputfile $globalobj`; - - # - # Step 6: Link the global version to our list. - # - `$ld -r $globalobj $mcount_o -o $globalmix`; - - # - # Step 7: Convert the local functions back into local symbols - # - `$objcopy $locallist $globalmix $inputfile`; - - # Remove the temp files - `$rm $globalobj $globalmix`; - -} else { - - my $mix = $dirname . "/.tmp_mx_" . $filename; - - # - # Step 8: Link the object with our list of call sites object. - # - `$ld -r $inputfile $mcount_o -o $mix`; - - # - # Step 9: Move the result back to the original object. - # - `$mv $mix $inputfile`; -} - -# Clean up the temp files -`$rm $mcount_o $mcount_s`; - -exit(0); |