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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#
95# 1) Record all the local symbols by using 'nm'
96# 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 $V = '0.1';
115
Shaohua Li18c167f2009-01-12 10:00:51 +0800116if ($#ARGV < 7) {
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, $inputfile) = @ARGV;
Steven Rostedt8da38212008-08-14 15:45:07 -0400124
Shaohua Li25aac9d2009-01-09 11:29:40 +0800125# This file refers to mcount and shouldn't be ftraced, so lets' ignore it
126if ($inputfile eq "kernel/trace/ftrace.o") {
127 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;
Steven Rostedt42e007d2008-11-20 07:16:16 -0800155my $nm_regex; # Find the local functions (return function)
Steven Rostedt8da38212008-08-14 15:45:07 -0400156my $section_regex; # Find the start of a section
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400157my $function_regex; # Find the name of a function
158 # (return offset and func name)
Steven Rostedt8da38212008-08-14 15:45:07 -0400159my $mcount_regex; # Find the call site to mcount (return offset)
Matt Fleming3a3d04a2008-11-20 21:49:52 +0000160my $alignment; # The .align value to use for $mcount_section
Jim Radforde58918a2008-11-20 19:48:39 -0800161my $section_type; # Section header plus possible alignment command
Steven Rostedt8da38212008-08-14 15:45:07 -0400162
Steven Rostedtdce9d182008-10-23 09:32:57 -0400163if ($arch eq "x86") {
164 if ($bits == 64) {
165 $arch = "x86_64";
166 } else {
167 $arch = "i386";
168 }
169}
170
Steven Rostedtc204f722008-11-20 15:07:34 -0500171#
172# We base the defaults off of i386, the other archs may
173# feel free to change them in the below if statements.
174#
175$nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)";
176$section_regex = "Disassembly of section\\s+(\\S+):";
177$function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:";
178$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$";
Jim Radforde58918a2008-11-20 19:48:39 -0800179$section_type = '@progbits';
Steven Rostedtc204f722008-11-20 15:07:34 -0500180$type = ".long";
181
Steven Rostedt8da38212008-08-14 15:45:07 -0400182if ($arch eq "x86_64") {
Steven Rostedt8da38212008-08-14 15:45:07 -0400183 $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount([+-]0x[0-9a-zA-Z]+)?\$";
184 $type = ".quad";
Matt Fleming7d5222a2008-11-07 13:26:25 +0000185 $alignment = 8;
Steven Rostedtd74fcd12008-08-15 11:40:24 -0400186
187 # force flags for this arch
188 $ld .= " -m elf_x86_64";
189 $objdump .= " -M x86-64";
190 $objcopy .= " -O elf64-x86-64";
191 $cc .= " -m64";
192
Steven Rostedt8da38212008-08-14 15:45:07 -0400193} elsif ($arch eq "i386") {
Matt Fleming7d5222a2008-11-07 13:26:25 +0000194 $alignment = 4;
Steven Rostedtd74fcd12008-08-15 11:40:24 -0400195
196 # force flags for this arch
197 $ld .= " -m elf_i386";
198 $objdump .= " -M i386";
199 $objcopy .= " -O elf32-i386";
200 $cc .= " -m32";
201
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +0200202} elsif ($arch eq "s390" && $bits == 32) {
203 $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_390_32\\s+_mcount\$";
204 $alignment = 4;
205 $ld .= " -m elf_s390";
206 $cc .= " -m31";
207
208} elsif ($arch eq "s390" && $bits == 64) {
209 $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_390_(PC|PLT)32DBL\\s+_mcount\\+0x2\$";
210 $alignment = 8;
211 $type = ".quad";
212 $ld .= " -m elf64_s390";
213 $cc .= " -m64";
214
Matt Fleming0da85c02008-11-12 20:11:47 +0900215} elsif ($arch eq "sh") {
Matt Fleming3a3d04a2008-11-20 21:49:52 +0000216 $alignment = 2;
Matt Fleming0da85c02008-11-12 20:11:47 +0900217
218 # force flags for this arch
219 $ld .= " -m shlelf_linux";
220 $objcopy .= " -O elf32-sh-linux";
221 $cc .= " -m32";
222
Steven Rostedt42e007d2008-11-20 07:16:16 -0800223} elsif ($arch eq "powerpc") {
224 $nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\.?\\S+)";
Steven Rostedt42e007d2008-11-20 07:16:16 -0800225 $function_regex = "^([0-9a-fA-F]+)\\s+<(\\.?.*?)>:";
226 $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s\\.?_mcount\$";
Steven Rostedtc204f722008-11-20 15:07:34 -0500227
Steven Rostedt42e007d2008-11-20 07:16:16 -0800228 if ($bits == 64) {
229 $type = ".quad";
Steven Rostedt42e007d2008-11-20 07:16:16 -0800230 }
231
Jim Radforde58918a2008-11-20 19:48:39 -0800232} elsif ($arch eq "arm") {
233 $alignment = 2;
234 $section_type = '%progbits';
235
Shaohua Li418071e2009-01-09 11:29:44 +0800236} elsif ($arch eq "ia64") {
237 $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$";
238 $type = "data8";
239
240 if ($is_module eq "0") {
241 $cc .= " -mconstant-gp";
242 }
David S. Miller9be12f92009-06-13 01:03:24 -0700243} elsif ($arch eq "sparc64") {
244 # In the objdump output there are giblets like:
245 # 0000000000000000 <igmp_net_exit-0x18>:
246 # As there's some data blobs that get emitted into the
247 # text section before the first instructions and the first
248 # real symbols. We don't want to match that, so to combat
249 # this we use '\w' so we'll match just plain symbol names,
250 # and not those that also include hex offsets inside of the
251 # '<>' brackets. Actually the generic function_regex setting
252 # could safely use this too.
253 $function_regex = "^([0-9a-fA-F]+)\\s+<(\\w*?)>:";
254
255 # Sparc64 calls '_mcount' instead of plain 'mcount'.
256 $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$";
257
258 $alignment = 8;
259 $type = ".xword";
260 $ld .= " -m elf64_sparc";
261 $cc .= " -m64";
262 $objcopy .= " -O elf64-sparc";
Steven Rostedt8da38212008-08-14 15:45:07 -0400263} else {
264 die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD";
265}
266
267my $text_found = 0;
268my $read_function = 0;
269my $opened = 0;
Steven Rostedt8da38212008-08-14 15:45:07 -0400270my $mcount_section = "__mcount_loc";
271
272my $dirname;
273my $filename;
274my $prefix;
275my $ext;
276
277if ($inputfile =~ m,^(.*)/([^/]*)$,) {
278 $dirname = $1;
279 $filename = $2;
280} else {
281 $dirname = ".";
282 $filename = $inputfile;
283}
284
285if ($filename =~ m,^(.*)(\.\S),) {
286 $prefix = $1;
287 $ext = $2;
288} else {
289 $prefix = $filename;
290 $ext = "";
291}
292
293my $mcount_s = $dirname . "/.tmp_mc_" . $prefix . ".s";
294my $mcount_o = $dirname . "/.tmp_mc_" . $prefix . ".o";
295
296#
Steven Rostedtf2f84582008-08-25 14:52:11 -0400297# --globalize-symbols came out in 2.17, we must test the version
298# of objcopy, and if it is less than 2.17, then we can not
299# record local functions.
300my $use_locals = 01;
301my $local_warn_once = 0;
302my $found_version = 0;
303
304open (IN, "$objcopy --version |") || die "error running $objcopy";
305while (<IN>) {
306 if (/objcopy.*\s(\d+)\.(\d+)/) {
307 my $major = $1;
308 my $minor = $2;
309
310 $found_version = 1;
311 if ($major < 2 ||
312 ($major == 2 && $minor < 17)) {
313 $use_locals = 0;
314 }
315 last;
316 }
317}
318close (IN);
319
320if (!$found_version) {
321 print STDERR "WARNING: could not find objcopy version.\n" .
322 "\tDisabling local function references.\n";
323}
324
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.
327# 't' is local, 'w/W' is weak (we never use a weak function)
Steven Rostedt8da38212008-08-14 15:45:07 -0400328#
329open (IN, "$nm $inputfile|") || die "error running $nm";
330while (<IN>) {
Steven Rostedt42e007d2008-11-20 07:16:16 -0800331 if (/$nm_regex/) {
Steven Rostedt8da38212008-08-14 15:45:07 -0400332 $locals{$1} = 1;
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400333 } elsif (/^[0-9a-fA-F]+\s+([wW])\s+(\S+)/) {
334 $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 $offset = 0; # offset of ref_func to section beginning
342
343##
344# update_funcs - print out the current mcount callers
345#
346# Go through the list of offsets to callers and write them to
347# the output file in a format that can be read by an assembler.
348#
349sub update_funcs
350{
351 return if ($#offsets < 0);
352
353 defined($ref_func) || die "No function to reference";
354
355 # A section only had a weak function, to represent it.
356 # Unfortunately, a weak function may be overwritten by another
357 # function of the same name, making all these offsets incorrect.
358 # To be safe, we simply print a warning and bail.
359 if (defined $weak{$ref_func}) {
360 print STDERR
361 "$inputfile: WARNING: referencing weak function" .
362 " $ref_func for mcount\n";
363 return;
364 }
365
366 # is this function static? If so, note this fact.
367 if (defined $locals{$ref_func}) {
Steven Rostedtf2f84582008-08-25 14:52:11 -0400368
369 # only use locals if objcopy supports globalize-symbols
370 if (!$use_locals) {
Steven Rostedtf2f84582008-08-25 14:52:11 -0400371 return;
372 }
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400373 $convert{$ref_func} = 1;
374 }
375
376 # Loop through all the mcount caller offsets and print a reference
377 # to the caller based from the ref_func.
378 for (my $i=0; $i <= $#offsets; $i++) {
379 if (!$opened) {
380 open(FILE, ">$mcount_s") || die "can't create $mcount_s\n";
381 $opened = 1;
Jim Radforde58918a2008-11-20 19:48:39 -0800382 print FILE "\t.section $mcount_section,\"a\",$section_type\n";
Steven Rostedt42e007d2008-11-20 07:16:16 -0800383 print FILE "\t.align $alignment\n" if (defined($alignment));
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400384 }
385 printf FILE "\t%s %s + %d\n", $type, $ref_func, $offsets[$i] - $offset;
386 }
387}
388
Steven Rostedt8da38212008-08-14 15:45:07 -0400389#
390# Step 2: find the sections and mcount call sites
391#
Steven Rostedtb43f7092009-01-16 23:18:31 -0500392open(IN, "$objdump -hdr $inputfile|") || die "error running $objdump";
Steven Rostedt8da38212008-08-14 15:45:07 -0400393
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400394my $text;
395
Steven Rostedtb43f7092009-01-16 23:18:31 -0500396my $read_headers = 1;
397
Steven Rostedt8da38212008-08-14 15:45:07 -0400398while (<IN>) {
399 # is it a section?
400 if (/$section_regex/) {
Steven Rostedtb43f7092009-01-16 23:18:31 -0500401 $read_headers = 0;
Steven Rostedt34698bc2008-10-23 09:32:58 -0400402
403 # Only record text sections that we know are safe
404 if (defined($text_sections{$1})) {
405 $read_function = 1;
406 } else {
407 $read_function = 0;
408 }
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400409 # print out any recorded offsets
Steven Rostedt7dbdee22009-08-06 19:53:18 -0400410 update_funcs() if (defined($ref_func));
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400411
412 # reset all markers and arrays
Steven Rostedt8da38212008-08-14 15:45:07 -0400413 $text_found = 0;
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400414 undef($ref_func);
415 undef(@offsets);
416
Steven Rostedt8da38212008-08-14 15:45:07 -0400417 # section found, now is this a start of a function?
418 } elsif ($read_function && /$function_regex/) {
Steven Rostedt8da38212008-08-14 15:45:07 -0400419 $text_found = 1;
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400420 $text = $2;
421
422 # if this is either a local function or a weak function
423 # keep looking for functions that are global that
424 # we can use safely.
425 if (!defined($locals{$text}) && !defined($weak{$text})) {
426 $ref_func = $text;
427 $read_function = 0;
Matt Flemingbd171d52009-07-23 17:16:15 +0100428 $offset = hex $1;
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400429 } else {
430 # if we already have a function, and this is weak, skip it
Steven Rostedt3f6e9682009-08-05 22:00:14 -0400431 if (!defined($ref_func) && !defined($weak{$text}) &&
432 # PPC64 can have symbols that start with .L and
433 # gcc considers these special. Don't use them!
434 $text !~ /^\.L/) {
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400435 $ref_func = $text;
Matt Flemingbd171d52009-07-23 17:16:15 +0100436 $offset = hex $1;
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400437 }
Steven Rostedt8da38212008-08-14 15:45:07 -0400438 }
Steven Rostedtb43f7092009-01-16 23:18:31 -0500439 } elsif ($read_headers && /$mcount_section/) {
440 #
441 # Somehow the make process can execute this script on an
442 # object twice. If it does, we would duplicate the mcount
443 # section and it will cause the function tracer self test
444 # to fail. Check if the mcount section exists, and if it does,
445 # warn and exit.
446 #
447 print STDERR "ERROR: $mcount_section already in $inputfile\n" .
448 "\tThis may be an indication that your build is corrupted.\n" .
449 "\tDelete $inputfile and try again. If the same object file\n" .
450 "\tstill causes an issue, then disable CONFIG_DYNAMIC_FTRACE.\n";
451 exit(-1);
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400452 }
453
454 # is this a call site to mcount? If so, record it to print later
455 if ($text_found && /$mcount_regex/) {
456 $offsets[$#offsets + 1] = hex $1;
Steven Rostedt8da38212008-08-14 15:45:07 -0400457 }
458}
459
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400460# dump out anymore offsets that may have been found
Steven Rostedt7dbdee22009-08-06 19:53:18 -0400461update_funcs() if (defined($ref_func));
Steven Rostedt8feff1c2008-08-20 10:07:35 -0400462
Steven Rostedt8da38212008-08-14 15:45:07 -0400463# If we did not find any mcount callers, we are done (do nothing).
464if (!$opened) {
465 exit(0);
466}
467
468close(FILE);
469
470#
471# Step 3: Compile the file that holds the list of call sites to mcount.
472#
473`$cc -o $mcount_o -c $mcount_s`;
474
475my @converts = keys %convert;
476
477#
478# Step 4: Do we have sections that started with local functions?
479#
480if ($#converts >= 0) {
481 my $globallist = "";
482 my $locallist = "";
483
484 foreach my $con (@converts) {
485 $globallist .= " --globalize-symbol $con";
486 $locallist .= " --localize-symbol $con";
487 }
488
489 my $globalobj = $dirname . "/.tmp_gl_" . $filename;
490 my $globalmix = $dirname . "/.tmp_mx_" . $filename;
491
492 #
493 # Step 5: set up each local function as a global
494 #
495 `$objcopy $globallist $inputfile $globalobj`;
496
497 #
498 # Step 6: Link the global version to our list.
499 #
500 `$ld -r $globalobj $mcount_o -o $globalmix`;
501
502 #
503 # Step 7: Convert the local functions back into local symbols
504 #
505 `$objcopy $locallist $globalmix $inputfile`;
506
507 # Remove the temp files
508 `$rm $globalobj $globalmix`;
509
510} else {
511
512 my $mix = $dirname . "/.tmp_mx_" . $filename;
513
514 #
515 # Step 8: Link the object with our list of call sites object.
516 #
517 `$ld -r $inputfile $mcount_o -o $mix`;
518
519 #
520 # Step 9: Move the result back to the original object.
521 #
522 `$mv $mix $inputfile`;
523}
524
525# Clean up the temp files
526`$rm $mcount_o $mcount_s`;
527
528exit(0);