blob: 884776a6e01a2004d0ec972b62081bda7db2e693 [file] [log] [blame]
Steven Rostedt8da38212008-08-14 15:45:07 -04001#!/usr/bin/perl -w
2# (c) 2008, Steven Rostedt <srostedt@redhat.com>
3# Licensed under the terms of the GNU GPL License version 2
4#
5# recordmcount.pl - makes a section called __mcount_loc that holds
6# all the offsets to the calls to mcount.
7#
8#
Li Hongd49f6aa2009-10-28 13:01:38 +08009# What we want to end up with this is that each object file will have a
10# section called __mcount_loc that will hold the list of pointers to mcount
11# callers. After final linking, the vmlinux will have within .init.data the
12# list of all callers to mcount between __start_mcount_loc and __stop_mcount_loc.
13# Later on boot up, the kernel will read this list, save the locations and turn
14# them into nops. When tracing or profiling is later enabled, these locations
15# will then be converted back to pointers to some function.
Steven Rostedt8da38212008-08-14 15:45:07 -040016#
17# This is no easy feat. This script is called just after the original
18# object is compiled and before it is linked.
19#
Li Hongd49f6aa2009-10-28 13:01:38 +080020# When parse this object file using 'objdump', the references to the call
21# sites are offsets from the section that the call site is in. Hence, all
22# functions in a section that has a call site to mcount, will have the
23# offset from the beginning of the section and not the beginning of the
24# function.
Steven Rostedt8da38212008-08-14 15:45:07 -040025#
Li Hongd49f6aa2009-10-28 13:01:38 +080026# But where this section will reside finally in vmlinx is undetermined at
27# this point. So we can't use this kind of offsets to record the final
28# address of this call site.
29#
30# The trick is to change the call offset referring the start of a section to
31# referring a function symbol in this section. During the link step, 'ld' will
32# compute the final address according to the information we record.
33#
Steven Rostedt8da38212008-08-14 15:45:07 -040034# e.g.
35#
Tim Abbott31b6e762009-04-30 20:06:11 -040036# .section ".sched.text", "ax"
Steven Rostedt8da38212008-08-14 15:45:07 -040037# [...]
Li Hongd49f6aa2009-10-28 13:01:38 +080038# func1:
39# [...]
40# call mcount (offset: 0x10)
Steven Rostedt8da38212008-08-14 15:45:07 -040041# [...]
42# ret
Li Hongd49f6aa2009-10-28 13:01:38 +080043# .globl fun2
44# func2: (offset: 0x20)
Steven Rostedt8da38212008-08-14 15:45:07 -040045# [...]
Li Hongd49f6aa2009-10-28 13:01:38 +080046# [...]
47# ret
48# func3:
49# [...]
50# call mcount (offset: 0x30)
Steven Rostedt8da38212008-08-14 15:45:07 -040051# [...]
52#
53# Both relocation offsets for the mcounts in the above example will be
Li Hongd49f6aa2009-10-28 13:01:38 +080054# offset from .sched.text. If we choose global symbol func2 as a reference and
55# make another file called tmp.s with the new offsets:
Steven Rostedt8da38212008-08-14 15:45:07 -040056#
57# .section __mcount_loc
Li Hongd49f6aa2009-10-28 13:01:38 +080058# .quad func2 - 0x10
59# .quad func2 + 0x10
Steven Rostedt8da38212008-08-14 15:45:07 -040060#
Li Hongd49f6aa2009-10-28 13:01:38 +080061# We can then compile this tmp.s into tmp.o, and link it back to the original
Steven Rostedt8da38212008-08-14 15:45:07 -040062# object.
63#
Li Hongd49f6aa2009-10-28 13:01:38 +080064# In our algorithm, we will choose the first global function we meet in this
65# section as the reference. But this gets hard if there is no global functions
66# in this section. In such a case we have to select a local one. E.g. func1:
Steven Rostedt8da38212008-08-14 15:45:07 -040067#
Tim Abbott31b6e762009-04-30 20:06:11 -040068# .section ".sched.text", "ax"
Li Hongd49f6aa2009-10-28 13:01:38 +080069# func1:
Steven Rostedt8da38212008-08-14 15:45:07 -040070# [...]
Li Hongd49f6aa2009-10-28 13:01:38 +080071# call mcount (offset: 0x10)
Steven Rostedt8da38212008-08-14 15:45:07 -040072# [...]
73# ret
Li Hongd49f6aa2009-10-28 13:01:38 +080074# func2:
Steven Rostedt8da38212008-08-14 15:45:07 -040075# [...]
Li Hongd49f6aa2009-10-28 13:01:38 +080076# call mcount (offset: 0x20)
Steven Rostedt8da38212008-08-14 15:45:07 -040077# [...]
Li Hongd49f6aa2009-10-28 13:01:38 +080078# .section "other.section"
Steven Rostedt8da38212008-08-14 15:45:07 -040079#
80# If we make the tmp.s the same as above, when we link together with
Li Hongd49f6aa2009-10-28 13:01:38 +080081# the original object, we will end up with two symbols for func1:
Steven Rostedt8da38212008-08-14 15:45:07 -040082# one local, one global. After final compile, we will end up with
Li Hongd49f6aa2009-10-28 13:01:38 +080083# an undefined reference to func1 or a wrong reference to another global
84# func1 in other files.
Steven Rostedt8da38212008-08-14 15:45:07 -040085#
86# Since local objects can reference local variables, we need to find
87# a way to make tmp.o reference the local objects of the original object
Li Hongd49f6aa2009-10-28 13:01:38 +080088# file after it is linked together. To do this, we convert func1
Steven Rostedt8da38212008-08-14 15:45:07 -040089# into a global symbol before linking tmp.o. Then after we link tmp.o
Li Hongd49f6aa2009-10-28 13:01:38 +080090# we will only have a single symbol for func1 that is global.
91# We can convert func1 back into a local symbol and we are done.
Steven Rostedt8da38212008-08-14 15:45:07 -040092#
93# Here are the steps we take:
94#
Li Hong306dcf42009-10-28 13:06:19 +080095# 1) Record all the local and weak symbols by using 'nm'
Steven Rostedt8da38212008-08-14 15:45:07 -040096# 2) Use objdump to find all the call site offsets and sections for
97# mcount.
98# 3) Compile the list into its own object.
99# 4) Do we have to deal with local functions? If not, go to step 8.
100# 5) Make an object that converts these local functions to global symbols
101# with objcopy.
102# 6) Link together this new object with the list object.
103# 7) Convert the local functions back to local symbols and rename
104# the result as the original object.
Steven Rostedt8da38212008-08-14 15:45:07 -0400105# 8) Link the object with the list object.
106# 9) Move the result back to the original object.
Steven Rostedt8da38212008-08-14 15:45:07 -0400107#
108
109use strict;
110
111my $P = $0;
112$P =~ s@.*/@@g;
113
114my $V = '0.1';
115
Li Honge2d753f2009-10-27 14:57:33 +0800116if ($#ARGV != 10) {
Steven Rostedtb43f7092009-01-16 23:18:31 -0500117 print "usage: $P arch bits objdump objcopy cc ld nm rm mv is_module inputfile\n";
Steven Rostedt8da38212008-08-14 15:45:07 -0400118 print "version: $V\n";
119 exit(1);
120}
121
Steven Rostedtdce9d182008-10-23 09:32:57 -0400122my ($arch, $bits, $objdump, $objcopy, $cc,
Shaohua Li18c167f2009-01-12 10:00:51 +0800123 $ld, $nm, $rm, $mv, $is_module, $inputfile) = @ARGV;
Steven Rostedt8da38212008-08-14 15:45:07 -0400124
Shaohua Li25aac9d2009-01-09 11:29:40 +0800125# This file refers to mcount and shouldn't be ftraced, so lets' ignore it
Li Hongbdd3b052009-10-28 13:03:32 +0800126if ($inputfile =~ m,kernel/trace/ftrace\.o$,) {
Shaohua Li25aac9d2009-01-09 11:29:40 +0800127 exit(0);
128}
129
Steven Rostedt34698bc2008-10-23 09:32:58 -0400130# Acceptable sections to record.
131my %text_sections = (
132 ".text" => 1,
Liming Wangd144d5e2008-11-26 10:29:26 +0800133 ".sched.text" => 1,
134 ".spinlock.text" => 1,
Frederic Weisbeckera0343e82008-12-09 23:53:16 +0100135 ".irqentry.text" => 1,
Jiri Olsa4d828942009-10-13 16:33:54 -0400136 ".text.unlikely" => 1,
Steven Rostedt34698bc2008-10-23 09:32:58 -0400137);
138
Steven Rostedt8da38212008-08-14 15:45:07 -0400139$objdump = "objdump" if ((length $objdump) == 0);
140$objcopy = "objcopy" if ((length $objcopy) == 0);
141$cc = "gcc" if ((length $cc) == 0);
142$ld = "ld" if ((length $ld) == 0);
143$nm = "nm" if ((length $nm) == 0);
144$rm = "rm" if ((length $rm) == 0);
145$mv = "mv" if ((length $mv) == 0);
146
147#print STDERR "running: $P '$arch' '$objdump' '$objcopy' '$cc' '$ld' " .
148# "'$nm' '$rm' '$mv' '$inputfile'\n";
149
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400150my %locals; # List of local (static) functions
151my %weak; # List of weak functions
152my %convert; # List of local functions used that needs conversion
Steven Rostedt8da38212008-08-14 15:45:07 -0400153
154my $type;
Li Hong306dcf42009-10-28 13:06:19 +0800155my $local_regex; # Match a local function (return function)
156my $weak_regex; # Match a weak function (return function)
Steven Rostedt8da38212008-08-14 15:45:07 -0400157my $section_regex; # Find the start of a section
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400158my $function_regex; # Find the name of a function
159 # (return offset and func name)
Steven Rostedt8da38212008-08-14 15:45:07 -0400160my $mcount_regex; # Find the call site to mcount (return offset)
Matt Fleming3a3d04a2008-11-20 21:49:52 +0000161my $alignment; # The .align value to use for $mcount_section
Jim Radforde58918a2008-11-20 19:48:39 -0800162my $section_type; # Section header plus possible alignment command
Li Hong7b7edc22009-10-28 13:04:21 +0800163my $can_use_local = 0; # If we can use local function references
164
165##
166# check_objcopy - whether objcopy supports --globalize-symbols
167#
168# --globalize-symbols came out in 2.17, we must test the version
169# of objcopy, and if it is less than 2.17, then we can not
170# record local functions.
171sub check_objcopy
172{
173 open (IN, "$objcopy --version |") or die "error running $objcopy";
174 while (<IN>) {
175 if (/objcopy.*\s(\d+)\.(\d+)/) {
176 $can_use_local = 1 if ($1 > 2 || ($1 == 2 && $2 >= 17));
177 last;
178 }
179 }
180 close (IN);
181
182 if (!$can_use_local) {
183 print STDERR "WARNING: could not find objcopy version or version " .
184 "is less than 2.17.\n" .
185 "\tLocal function references is disabled.\n";
186 }
187}
Steven Rostedt8da38212008-08-14 15:45:07 -0400188
Steven Rostedtdce9d182008-10-23 09:32:57 -0400189if ($arch eq "x86") {
190 if ($bits == 64) {
191 $arch = "x86_64";
192 } else {
193 $arch = "i386";
194 }
195}
196
Steven Rostedtc204f722008-11-20 15:07:34 -0500197#
198# We base the defaults off of i386, the other archs may
199# feel free to change them in the below if statements.
200#
Li Hong306dcf42009-10-28 13:06:19 +0800201$local_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)";
202$weak_regex = "^[0-9a-fA-F]+\\s+([wW])\\s+(\\S+)";
Steven Rostedtc204f722008-11-20 15:07:34 -0500203$section_regex = "Disassembly of section\\s+(\\S+):";
204$function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:";
205$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$";
Jim Radforde58918a2008-11-20 19:48:39 -0800206$section_type = '@progbits';
Steven Rostedtc204f722008-11-20 15:07:34 -0500207$type = ".long";
208
Steven Rostedt8da38212008-08-14 15:45:07 -0400209if ($arch eq "x86_64") {
Steven Rostedt8da38212008-08-14 15:45:07 -0400210 $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount([+-]0x[0-9a-zA-Z]+)?\$";
211 $type = ".quad";
Matt Fleming7d5222a2008-11-07 13:26:25 +0000212 $alignment = 8;
Steven Rostedtd74fcd12008-08-15 11:40:24 -0400213
214 # force flags for this arch
215 $ld .= " -m elf_x86_64";
216 $objdump .= " -M x86-64";
217 $objcopy .= " -O elf64-x86-64";
218 $cc .= " -m64";
219
Steven Rostedt8da38212008-08-14 15:45:07 -0400220} elsif ($arch eq "i386") {
Matt Fleming7d5222a2008-11-07 13:26:25 +0000221 $alignment = 4;
Steven Rostedtd74fcd12008-08-15 11:40:24 -0400222
223 # force flags for this arch
224 $ld .= " -m elf_i386";
225 $objdump .= " -M i386";
226 $objcopy .= " -O elf32-i386";
227 $cc .= " -m32";
228
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +0200229} elsif ($arch eq "s390" && $bits == 32) {
230 $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_390_32\\s+_mcount\$";
231 $alignment = 4;
232 $ld .= " -m elf_s390";
233 $cc .= " -m31";
234
235} elsif ($arch eq "s390" && $bits == 64) {
236 $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_390_(PC|PLT)32DBL\\s+_mcount\\+0x2\$";
237 $alignment = 8;
238 $type = ".quad";
239 $ld .= " -m elf64_s390";
240 $cc .= " -m64";
241
Matt Fleming0da85c02008-11-12 20:11:47 +0900242} elsif ($arch eq "sh") {
Matt Fleming3a3d04a2008-11-20 21:49:52 +0000243 $alignment = 2;
Matt Fleming0da85c02008-11-12 20:11:47 +0900244
245 # force flags for this arch
246 $ld .= " -m shlelf_linux";
247 $objcopy .= " -O elf32-sh-linux";
248 $cc .= " -m32";
249
Steven Rostedt42e007d2008-11-20 07:16:16 -0800250} elsif ($arch eq "powerpc") {
Li Hong306dcf42009-10-28 13:06:19 +0800251 $local_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\.?\\S+)";
Steven Rostedt42e007d2008-11-20 07:16:16 -0800252 $function_regex = "^([0-9a-fA-F]+)\\s+<(\\.?.*?)>:";
253 $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s\\.?_mcount\$";
Steven Rostedtc204f722008-11-20 15:07:34 -0500254
Steven Rostedt42e007d2008-11-20 07:16:16 -0800255 if ($bits == 64) {
256 $type = ".quad";
Steven Rostedt42e007d2008-11-20 07:16:16 -0800257 }
258
Jim Radforde58918a2008-11-20 19:48:39 -0800259} elsif ($arch eq "arm") {
260 $alignment = 2;
261 $section_type = '%progbits';
262
Shaohua Li418071e2009-01-09 11:29:44 +0800263} elsif ($arch eq "ia64") {
264 $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$";
265 $type = "data8";
266
267 if ($is_module eq "0") {
268 $cc .= " -mconstant-gp";
269 }
David S. Miller9be12f92009-06-13 01:03:24 -0700270} elsif ($arch eq "sparc64") {
271 # In the objdump output there are giblets like:
272 # 0000000000000000 <igmp_net_exit-0x18>:
273 # As there's some data blobs that get emitted into the
274 # text section before the first instructions and the first
275 # real symbols. We don't want to match that, so to combat
276 # this we use '\w' so we'll match just plain symbol names,
277 # and not those that also include hex offsets inside of the
278 # '<>' brackets. Actually the generic function_regex setting
279 # could safely use this too.
280 $function_regex = "^([0-9a-fA-F]+)\\s+<(\\w*?)>:";
281
282 # Sparc64 calls '_mcount' instead of plain 'mcount'.
283 $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$";
284
285 $alignment = 8;
286 $type = ".xword";
287 $ld .= " -m elf64_sparc";
288 $cc .= " -m64";
289 $objcopy .= " -O elf64-sparc";
Steven Rostedt8da38212008-08-14 15:45:07 -0400290} else {
291 die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD";
292}
293
294my $text_found = 0;
295my $read_function = 0;
296my $opened = 0;
Steven Rostedt8da38212008-08-14 15:45:07 -0400297my $mcount_section = "__mcount_loc";
298
299my $dirname;
300my $filename;
301my $prefix;
302my $ext;
303
304if ($inputfile =~ m,^(.*)/([^/]*)$,) {
305 $dirname = $1;
306 $filename = $2;
307} else {
308 $dirname = ".";
309 $filename = $inputfile;
310}
311
312if ($filename =~ m,^(.*)(\.\S),) {
313 $prefix = $1;
314 $ext = $2;
315} else {
316 $prefix = $filename;
317 $ext = "";
318}
319
320my $mcount_s = $dirname . "/.tmp_mc_" . $prefix . ".s";
321my $mcount_o = $dirname . "/.tmp_mc_" . $prefix . ".o";
322
Li Hong7b7edc22009-10-28 13:04:21 +0800323check_objcopy();
Steven Rostedtf2f84582008-08-25 14:52:11 -0400324
Steven Rostedtf2f84582008-08-25 14:52:11 -0400325#
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400326# Step 1: find all the local (static functions) and weak symbols.
Li Hong306dcf42009-10-28 13:06:19 +0800327# 't' is local, 'w/W' is weak
Steven Rostedt8da38212008-08-14 15:45:07 -0400328#
329open (IN, "$nm $inputfile|") || die "error running $nm";
330while (<IN>) {
Li Hong306dcf42009-10-28 13:06:19 +0800331 if (/$local_regex/) {
Steven Rostedt8da38212008-08-14 15:45:07 -0400332 $locals{$1} = 1;
Li Hong306dcf42009-10-28 13:06:19 +0800333 } elsif (/$weak_regex/) {
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400334 $weak{$2} = $1;
Steven Rostedt8da38212008-08-14 15:45:07 -0400335 }
336}
337close(IN);
338
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400339my @offsets; # Array of offsets of mcount callers
340my $ref_func; # reference function to use for offsets
341my $offset = 0; # offset of ref_func to section beginning
342
343##
344# update_funcs - print out the current mcount callers
345#
346# Go through the list of offsets to callers and write them to
347# the output file in a format that can be read by an assembler.
348#
349sub update_funcs
350{
Li Hong60928582009-10-28 13:07:03 +0800351 return unless ($ref_func and @offsets);
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400352
353 # A section only had a weak function, to represent it.
354 # Unfortunately, a weak function may be overwritten by another
355 # function of the same name, making all these offsets incorrect.
356 # To be safe, we simply print a warning and bail.
357 if (defined $weak{$ref_func}) {
358 print STDERR
359 "$inputfile: WARNING: referencing weak function" .
360 " $ref_func for mcount\n";
361 return;
362 }
363
364 # is this function static? If so, note this fact.
365 if (defined $locals{$ref_func}) {
Steven Rostedtf2f84582008-08-25 14:52:11 -0400366
367 # only use locals if objcopy supports globalize-symbols
Li Hong7b7edc22009-10-28 13:04:21 +0800368 if (!$can_use_local) {
Steven Rostedtf2f84582008-08-25 14:52:11 -0400369 return;
370 }
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400371 $convert{$ref_func} = 1;
372 }
373
374 # Loop through all the mcount caller offsets and print a reference
375 # to the caller based from the ref_func.
376 for (my $i=0; $i <= $#offsets; $i++) {
377 if (!$opened) {
378 open(FILE, ">$mcount_s") || die "can't create $mcount_s\n";
379 $opened = 1;
Jim Radforde58918a2008-11-20 19:48:39 -0800380 print FILE "\t.section $mcount_section,\"a\",$section_type\n";
Steven Rostedt42e007d2008-11-20 07:16:16 -0800381 print FILE "\t.align $alignment\n" if (defined($alignment));
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400382 }
383 printf FILE "\t%s %s + %d\n", $type, $ref_func, $offsets[$i] - $offset;
384 }
385}
386
Steven Rostedt8da38212008-08-14 15:45:07 -0400387#
388# Step 2: find the sections and mcount call sites
389#
Steven Rostedtb43f7092009-01-16 23:18:31 -0500390open(IN, "$objdump -hdr $inputfile|") || die "error running $objdump";
Steven Rostedt8da38212008-08-14 15:45:07 -0400391
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400392my $text;
393
Li Hongdb24c7d2009-10-28 13:05:23 +0800394
395# read headers first
Steven Rostedtb43f7092009-01-16 23:18:31 -0500396my $read_headers = 1;
397
Steven Rostedt8da38212008-08-14 15:45:07 -0400398while (<IN>) {
Li Hongdb24c7d2009-10-28 13:05:23 +0800399
400 if ($read_headers && /$mcount_section/) {
401 #
402 # Somehow the make process can execute this script on an
403 # object twice. If it does, we would duplicate the mcount
404 # section and it will cause the function tracer self test
405 # to fail. Check if the mcount section exists, and if it does,
406 # warn and exit.
407 #
408 print STDERR "ERROR: $mcount_section already in $inputfile\n" .
409 "\tThis may be an indication that your build is corrupted.\n" .
410 "\tDelete $inputfile and try again. If the same object file\n" .
411 "\tstill causes an issue, then disable CONFIG_DYNAMIC_FTRACE.\n";
412 exit(-1);
413 }
414
Steven Rostedt8da38212008-08-14 15:45:07 -0400415 # is it a section?
416 if (/$section_regex/) {
Steven Rostedtb43f7092009-01-16 23:18:31 -0500417 $read_headers = 0;
Steven Rostedt34698bc2008-10-23 09:32:58 -0400418
419 # Only record text sections that we know are safe
420 if (defined($text_sections{$1})) {
421 $read_function = 1;
422 } else {
423 $read_function = 0;
424 }
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400425 # print out any recorded offsets
Li Hong60928582009-10-28 13:07:03 +0800426 update_funcs();
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400427
428 # reset all markers and arrays
Steven Rostedt8da38212008-08-14 15:45:07 -0400429 $text_found = 0;
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400430 undef($ref_func);
431 undef(@offsets);
432
Steven Rostedt8da38212008-08-14 15:45:07 -0400433 # section found, now is this a start of a function?
434 } elsif ($read_function && /$function_regex/) {
Steven Rostedt8da38212008-08-14 15:45:07 -0400435 $text_found = 1;
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400436 $text = $2;
437
438 # if this is either a local function or a weak function
439 # keep looking for functions that are global that
440 # we can use safely.
441 if (!defined($locals{$text}) && !defined($weak{$text})) {
442 $ref_func = $text;
443 $read_function = 0;
Matt Flemingbd171d52009-07-23 17:16:15 +0100444 $offset = hex $1;
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400445 } else {
446 # if we already have a function, and this is weak, skip it
Steven Rostedt3f6e9682009-08-05 22:00:14 -0400447 if (!defined($ref_func) && !defined($weak{$text}) &&
448 # PPC64 can have symbols that start with .L and
449 # gcc considers these special. Don't use them!
450 $text !~ /^\.L/) {
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400451 $ref_func = $text;
Matt Flemingbd171d52009-07-23 17:16:15 +0100452 $offset = hex $1;
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400453 }
Steven Rostedt8da38212008-08-14 15:45:07 -0400454 }
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400455 }
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400456 # is this a call site to mcount? If so, record it to print later
457 if ($text_found && /$mcount_regex/) {
458 $offsets[$#offsets + 1] = hex $1;
Steven Rostedt8da38212008-08-14 15:45:07 -0400459 }
460}
461
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400462# dump out anymore offsets that may have been found
Li Hong60928582009-10-28 13:07:03 +0800463update_funcs();
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400464
Steven Rostedt8da38212008-08-14 15:45:07 -0400465# If we did not find any mcount callers, we are done (do nothing).
466if (!$opened) {
467 exit(0);
468}
469
470close(FILE);
471
472#
473# Step 3: Compile the file that holds the list of call sites to mcount.
474#
475`$cc -o $mcount_o -c $mcount_s`;
476
477my @converts = keys %convert;
478
479#
480# Step 4: Do we have sections that started with local functions?
481#
482if ($#converts >= 0) {
483 my $globallist = "";
484 my $locallist = "";
485
486 foreach my $con (@converts) {
487 $globallist .= " --globalize-symbol $con";
488 $locallist .= " --localize-symbol $con";
489 }
490
491 my $globalobj = $dirname . "/.tmp_gl_" . $filename;
492 my $globalmix = $dirname . "/.tmp_mx_" . $filename;
493
494 #
495 # Step 5: set up each local function as a global
496 #
497 `$objcopy $globallist $inputfile $globalobj`;
498
499 #
500 # Step 6: Link the global version to our list.
501 #
502 `$ld -r $globalobj $mcount_o -o $globalmix`;
503
504 #
505 # Step 7: Convert the local functions back into local symbols
506 #
507 `$objcopy $locallist $globalmix $inputfile`;
508
509 # Remove the temp files
510 `$rm $globalobj $globalmix`;
511
512} else {
513
514 my $mix = $dirname . "/.tmp_mx_" . $filename;
515
516 #
517 # Step 8: Link the object with our list of call sites object.
518 #
519 `$ld -r $inputfile $mcount_o -o $mix`;
520
521 #
522 # Step 9: Move the result back to the original object.
523 #
524 `$mv $mix $inputfile`;
525}
526
527# Clean up the temp files
528`$rm $mcount_o $mcount_s`;
529
530exit(0);