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8da3821b SR |
1 | #!/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 | # | |
d49f6aa7 LH |
9 | # 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. | |
8da3821b SR |
16 | # |
17 | # This is no easy feat. This script is called just after the original | |
18 | # object is compiled and before it is linked. | |
19 | # | |
d49f6aa7 LH |
20 | # 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. | |
25 | # | |
26 | # 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. | |
8da3821b | 33 | # |
8da3821b SR |
34 | # e.g. |
35 | # | |
31b6e76e | 36 | # .section ".sched.text", "ax" |
8da3821b | 37 | # [...] |
d49f6aa7 LH |
38 | # func1: |
39 | # [...] | |
40 | # call mcount (offset: 0x10) | |
41 | # [...] | |
42 | # ret | |
43 | # .globl fun2 | |
44 | # func2: (offset: 0x20) | |
45 | # [...] | |
8da3821b SR |
46 | # [...] |
47 | # ret | |
d49f6aa7 | 48 | # func3: |
8da3821b | 49 | # [...] |
d49f6aa7 | 50 | # call mcount (offset: 0x30) |
8da3821b SR |
51 | # [...] |
52 | # | |
53 | # Both relocation offsets for the mcounts in the above example will be | |
d49f6aa7 LH |
54 | # 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: | |
8da3821b SR |
56 | # |
57 | # .section __mcount_loc | |
d49f6aa7 LH |
58 | # .quad func2 - 0x10 |
59 | # .quad func2 + 0x10 | |
8da3821b | 60 | # |
d49f6aa7 | 61 | # We can then compile this tmp.s into tmp.o, and link it back to the original |
8da3821b SR |
62 | # object. |
63 | # | |
d49f6aa7 LH |
64 | # 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: | |
8da3821b | 67 | # |
31b6e76e | 68 | # .section ".sched.text", "ax" |
d49f6aa7 | 69 | # func1: |
8da3821b | 70 | # [...] |
d49f6aa7 | 71 | # call mcount (offset: 0x10) |
8da3821b SR |
72 | # [...] |
73 | # ret | |
d49f6aa7 | 74 | # func2: |
8da3821b | 75 | # [...] |
d49f6aa7 | 76 | # call mcount (offset: 0x20) |
8da3821b | 77 | # [...] |
d49f6aa7 | 78 | # .section "other.section" |
8da3821b SR |
79 | # |
80 | # If we make the tmp.s the same as above, when we link together with | |
d49f6aa7 | 81 | # the original object, we will end up with two symbols for func1: |
8da3821b | 82 | # one local, one global. After final compile, we will end up with |
d49f6aa7 LH |
83 | # an undefined reference to func1 or a wrong reference to another global |
84 | # func1 in other files. | |
8da3821b SR |
85 | # |
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 | |
d49f6aa7 | 88 | # file after it is linked together. To do this, we convert func1 |
8da3821b | 89 | # into a global symbol before linking tmp.o. Then after we link tmp.o |
d49f6aa7 LH |
90 | # 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. | |
8da3821b SR |
92 | # |
93 | # Here are the steps we take: | |
94 | # | |
306dcf47 | 95 | # 1) Record all the local and weak symbols by using 'nm' |
8da3821b SR |
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. | |
8da3821b SR |
105 | # 8) Link the object with the list object. |
106 | # 9) Move the result back to the original object. | |
8da3821b SR |
107 | # |
108 | ||
109 | use strict; | |
110 | ||
111 | my $P = $0; | |
112 | $P =~ s@.*/@@g; | |
113 | ||
114 | my $V = '0.1'; | |
115 | ||
e2d753fa | 116 | if ($#ARGV != 10) { |
b43f7093 | 117 | print "usage: $P arch bits objdump objcopy cc ld nm rm mv is_module inputfile\n"; |
8da3821b SR |
118 | print "version: $V\n"; |
119 | exit(1); | |
120 | } | |
121 | ||
dce9d18a | 122 | my ($arch, $bits, $objdump, $objcopy, $cc, |
18c167fd | 123 | $ld, $nm, $rm, $mv, $is_module, $inputfile) = @ARGV; |
8da3821b | 124 | |
25aac9dc | 125 | # This file refers to mcount and shouldn't be ftraced, so lets' ignore it |
bdd3b052 | 126 | if ($inputfile =~ m,kernel/trace/ftrace\.o$,) { |
25aac9dc SL |
127 | exit(0); |
128 | } | |
129 | ||
34698bcb SR |
130 | # Acceptable sections to record. |
131 | my %text_sections = ( | |
132 | ".text" => 1, | |
d144d5ee LW |
133 | ".sched.text" => 1, |
134 | ".spinlock.text" => 1, | |
a0343e82 | 135 | ".irqentry.text" => 1, |
4d828949 | 136 | ".text.unlikely" => 1, |
34698bcb SR |
137 | ); |
138 | ||
8da3821b SR |
139 | $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 | ||
8feff1ca SR |
150 | my %locals; # List of local (static) functions |
151 | my %weak; # List of weak functions | |
152 | my %convert; # List of local functions used that needs conversion | |
8da3821b SR |
153 | |
154 | my $type; | |
306dcf47 LH |
155 | my $local_regex; # Match a local function (return function) |
156 | my $weak_regex; # Match a weak function (return function) | |
8da3821b | 157 | my $section_regex; # Find the start of a section |
8feff1ca SR |
158 | my $function_regex; # Find the name of a function |
159 | # (return offset and func name) | |
8da3821b | 160 | my $mcount_regex; # Find the call site to mcount (return offset) |
3a3d04ae | 161 | my $alignment; # The .align value to use for $mcount_section |
e58918ab | 162 | my $section_type; # Section header plus possible alignment command |
7b7edc27 LH |
163 | my $can_use_local = 0; # If we can use local function references |
164 | ||
165 | ## | |
166 | # check_objcopy - whether objcopy supports --globalize-symbols | |
167 | # | |
168 | # --globalize-symbols came out in 2.17, we must test the version | |
169 | # of objcopy, and if it is less than 2.17, then we can not | |
170 | # record local functions. | |
171 | sub check_objcopy | |
172 | { | |
173 | open (IN, "$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 | } | |
8da3821b | 188 | |
dce9d18a SR |
189 | if ($arch eq "x86") { |
190 | if ($bits == 64) { | |
191 | $arch = "x86_64"; | |
192 | } else { | |
193 | $arch = "i386"; | |
194 | } | |
195 | } | |
196 | ||
c204f726 SR |
197 | # |
198 | # We base the defaults off of i386, the other archs may | |
199 | # feel free to change them in the below if statements. | |
200 | # | |
306dcf47 LH |
201 | $local_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)"; |
202 | $weak_regex = "^[0-9a-fA-F]+\\s+([wW])\\s+(\\S+)"; | |
c204f726 SR |
203 | $section_regex = "Disassembly of section\\s+(\\S+):"; |
204 | $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; | |
205 | $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$"; | |
e58918ab | 206 | $section_type = '@progbits'; |
c204f726 SR |
207 | $type = ".long"; |
208 | ||
8da3821b | 209 | if ($arch eq "x86_64") { |
8da3821b SR |
210 | $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount([+-]0x[0-9a-zA-Z]+)?\$"; |
211 | $type = ".quad"; | |
7d5222a6 | 212 | $alignment = 8; |
d74fcd1e SR |
213 | |
214 | # force flags for this arch | |
215 | $ld .= " -m elf_x86_64"; | |
216 | $objdump .= " -M x86-64"; | |
217 | $objcopy .= " -O elf64-x86-64"; | |
218 | $cc .= " -m64"; | |
219 | ||
8da3821b | 220 | } elsif ($arch eq "i386") { |
7d5222a6 | 221 | $alignment = 4; |
d74fcd1e SR |
222 | |
223 | # force flags for this arch | |
224 | $ld .= " -m elf_i386"; | |
225 | $objdump .= " -M i386"; | |
226 | $objcopy .= " -O elf32-i386"; | |
227 | $cc .= " -m32"; | |
228 | ||
dfd9f7ab HC |
229 | } elsif ($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 | $cc .= " -m64"; | |
241 | ||
0da85c09 | 242 | } elsif ($arch eq "sh") { |
3a3d04ae | 243 | $alignment = 2; |
0da85c09 MF |
244 | |
245 | # force flags for this arch | |
246 | $ld .= " -m shlelf_linux"; | |
247 | $objcopy .= " -O elf32-sh-linux"; | |
248 | $cc .= " -m32"; | |
249 | ||
42e007d0 | 250 | } elsif ($arch eq "powerpc") { |
306dcf47 | 251 | $local_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\.?\\S+)"; |
42e007d0 SR |
252 | $function_regex = "^([0-9a-fA-F]+)\\s+<(\\.?.*?)>:"; |
253 | $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s\\.?_mcount\$"; | |
c204f726 | 254 | |
42e007d0 SR |
255 | if ($bits == 64) { |
256 | $type = ".quad"; | |
42e007d0 SR |
257 | } |
258 | ||
e58918ab JR |
259 | } elsif ($arch eq "arm") { |
260 | $alignment = 2; | |
261 | $section_type = '%progbits'; | |
262 | ||
418071eb SL |
263 | } elsif ($arch eq "ia64") { |
264 | $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$"; | |
265 | $type = "data8"; | |
266 | ||
267 | if ($is_module eq "0") { | |
268 | $cc .= " -mconstant-gp"; | |
269 | } | |
9be12f9b DM |
270 | } elsif ($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"; | |
8da3821b SR |
290 | } else { |
291 | die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD"; | |
292 | } | |
293 | ||
294 | my $text_found = 0; | |
295 | my $read_function = 0; | |
296 | my $opened = 0; | |
8da3821b SR |
297 | my $mcount_section = "__mcount_loc"; |
298 | ||
299 | my $dirname; | |
300 | my $filename; | |
301 | my $prefix; | |
302 | my $ext; | |
303 | ||
304 | if ($inputfile =~ m,^(.*)/([^/]*)$,) { | |
305 | $dirname = $1; | |
306 | $filename = $2; | |
307 | } else { | |
308 | $dirname = "."; | |
309 | $filename = $inputfile; | |
310 | } | |
311 | ||
312 | if ($filename =~ m,^(.*)(\.\S),) { | |
313 | $prefix = $1; | |
314 | $ext = $2; | |
315 | } else { | |
316 | $prefix = $filename; | |
317 | $ext = ""; | |
318 | } | |
319 | ||
320 | my $mcount_s = $dirname . "/.tmp_mc_" . $prefix . ".s"; | |
321 | my $mcount_o = $dirname . "/.tmp_mc_" . $prefix . ".o"; | |
322 | ||
7b7edc27 | 323 | check_objcopy(); |
f2f8458e | 324 | |
8da3821b | 325 | # |
8feff1ca | 326 | # Step 1: find all the local (static functions) and weak symbols. |
306dcf47 | 327 | # 't' is local, 'w/W' is weak |
8da3821b SR |
328 | # |
329 | open (IN, "$nm $inputfile|") || die "error running $nm"; | |
330 | while (<IN>) { | |
306dcf47 | 331 | if (/$local_regex/) { |
8da3821b | 332 | $locals{$1} = 1; |
306dcf47 | 333 | } elsif (/$weak_regex/) { |
8feff1ca | 334 | $weak{$2} = $1; |
8da3821b SR |
335 | } |
336 | } | |
337 | close(IN); | |
338 | ||
8feff1ca SR |
339 | my @offsets; # Array of offsets of mcount callers |
340 | my $ref_func; # reference function to use for offsets | |
341 | my $offset = 0; # offset of ref_func to section beginning | |
342 | ||
343 | ## | |
344 | # update_funcs - print out the current mcount callers | |
345 | # | |
346 | # Go through the list of offsets to callers and write them to | |
347 | # the output file in a format that can be read by an assembler. | |
348 | # | |
349 | sub update_funcs | |
350 | { | |
351 | return if ($#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}) { | |
f2f8458e SR |
368 | |
369 | # only use locals if objcopy supports globalize-symbols | |
7b7edc27 | 370 | if (!$can_use_local) { |
f2f8458e SR |
371 | return; |
372 | } | |
8feff1ca SR |
373 | $convert{$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; | |
e58918ab | 382 | print FILE "\t.section $mcount_section,\"a\",$section_type\n"; |
42e007d0 | 383 | print FILE "\t.align $alignment\n" if (defined($alignment)); |
8feff1ca SR |
384 | } |
385 | printf FILE "\t%s %s + %d\n", $type, $ref_func, $offsets[$i] - $offset; | |
386 | } | |
387 | } | |
388 | ||
8da3821b SR |
389 | # |
390 | # Step 2: find the sections and mcount call sites | |
391 | # | |
b43f7093 | 392 | open(IN, "$objdump -hdr $inputfile|") || die "error running $objdump"; |
8da3821b | 393 | |
8feff1ca SR |
394 | my $text; |
395 | ||
db24c7dc LH |
396 | |
397 | # read headers first | |
b43f7093 SR |
398 | my $read_headers = 1; |
399 | ||
8da3821b | 400 | while (<IN>) { |
db24c7dc LH |
401 | |
402 | if ($read_headers && /$mcount_section/) { | |
403 | # | |
404 | # Somehow the make process can execute this script on an | |
405 | # object twice. If it does, we would duplicate the mcount | |
406 | # section and it will cause the function tracer self test | |
407 | # to fail. Check if the mcount section exists, and if it does, | |
408 | # warn and exit. | |
409 | # | |
410 | print STDERR "ERROR: $mcount_section already in $inputfile\n" . | |
411 | "\tThis may be an indication that your build is corrupted.\n" . | |
412 | "\tDelete $inputfile and try again. If the same object file\n" . | |
413 | "\tstill causes an issue, then disable CONFIG_DYNAMIC_FTRACE.\n"; | |
414 | exit(-1); | |
415 | } | |
416 | ||
8da3821b SR |
417 | # is it a section? |
418 | if (/$section_regex/) { | |
b43f7093 | 419 | $read_headers = 0; |
34698bcb SR |
420 | |
421 | # Only record text sections that we know are safe | |
422 | if (defined($text_sections{$1})) { | |
423 | $read_function = 1; | |
424 | } else { | |
425 | $read_function = 0; | |
426 | } | |
8feff1ca | 427 | # print out any recorded offsets |
7dbdee2e | 428 | update_funcs() if (defined($ref_func)); |
8feff1ca SR |
429 | |
430 | # reset all markers and arrays | |
8da3821b | 431 | $text_found = 0; |
8feff1ca SR |
432 | undef($ref_func); |
433 | undef(@offsets); | |
434 | ||
8da3821b SR |
435 | # section found, now is this a start of a function? |
436 | } elsif ($read_function && /$function_regex/) { | |
8da3821b | 437 | $text_found = 1; |
8feff1ca SR |
438 | $text = $2; |
439 | ||
440 | # if this is either a local function or a weak function | |
441 | # keep looking for functions that are global that | |
442 | # we can use safely. | |
443 | if (!defined($locals{$text}) && !defined($weak{$text})) { | |
444 | $ref_func = $text; | |
445 | $read_function = 0; | |
bd171d5f | 446 | $offset = hex $1; |
8feff1ca SR |
447 | } else { |
448 | # if we already have a function, and this is weak, skip it | |
3f6e968e SR |
449 | if (!defined($ref_func) && !defined($weak{$text}) && |
450 | # PPC64 can have symbols that start with .L and | |
451 | # gcc considers these special. Don't use them! | |
452 | $text !~ /^\.L/) { | |
8feff1ca | 453 | $ref_func = $text; |
bd171d5f | 454 | $offset = hex $1; |
8feff1ca | 455 | } |
8da3821b | 456 | } |
8feff1ca | 457 | } |
8feff1ca SR |
458 | # is this a call site to mcount? If so, record it to print later |
459 | if ($text_found && /$mcount_regex/) { | |
460 | $offsets[$#offsets + 1] = hex $1; | |
8da3821b SR |
461 | } |
462 | } | |
463 | ||
8feff1ca | 464 | # dump out anymore offsets that may have been found |
7dbdee2e | 465 | update_funcs() if (defined($ref_func)); |
8feff1ca | 466 | |
8da3821b SR |
467 | # If we did not find any mcount callers, we are done (do nothing). |
468 | if (!$opened) { | |
469 | exit(0); | |
470 | } | |
471 | ||
472 | close(FILE); | |
473 | ||
474 | # | |
475 | # Step 3: Compile the file that holds the list of call sites to mcount. | |
476 | # | |
477 | `$cc -o $mcount_o -c $mcount_s`; | |
478 | ||
479 | my @converts = keys %convert; | |
480 | ||
481 | # | |
482 | # Step 4: Do we have sections that started with local functions? | |
483 | # | |
484 | if ($#converts >= 0) { | |
485 | my $globallist = ""; | |
486 | my $locallist = ""; | |
487 | ||
488 | foreach my $con (@converts) { | |
489 | $globallist .= " --globalize-symbol $con"; | |
490 | $locallist .= " --localize-symbol $con"; | |
491 | } | |
492 | ||
493 | my $globalobj = $dirname . "/.tmp_gl_" . $filename; | |
494 | my $globalmix = $dirname . "/.tmp_mx_" . $filename; | |
495 | ||
496 | # | |
497 | # Step 5: set up each local function as a global | |
498 | # | |
499 | `$objcopy $globallist $inputfile $globalobj`; | |
500 | ||
501 | # | |
502 | # Step 6: Link the global version to our list. | |
503 | # | |
504 | `$ld -r $globalobj $mcount_o -o $globalmix`; | |
505 | ||
506 | # | |
507 | # Step 7: Convert the local functions back into local symbols | |
508 | # | |
509 | `$objcopy $locallist $globalmix $inputfile`; | |
510 | ||
511 | # Remove the temp files | |
512 | `$rm $globalobj $globalmix`; | |
513 | ||
514 | } else { | |
515 | ||
516 | my $mix = $dirname . "/.tmp_mx_" . $filename; | |
517 | ||
518 | # | |
519 | # Step 8: Link the object with our list of call sites object. | |
520 | # | |
521 | `$ld -r $inputfile $mcount_o -o $mix`; | |
522 | ||
523 | # | |
524 | # Step 9: Move the result back to the original object. | |
525 | # | |
526 | `$mv $mix $inputfile`; | |
527 | } | |
528 | ||
529 | # Clean up the temp files | |
530 | `$rm $mcount_o $mcount_s`; | |
531 | ||
532 | exit(0); |