Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 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 | # |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 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. |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 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 | # |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 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. |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 25 | # |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 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. |
| 33 | # |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 34 | # e.g. |
| 35 | # |
Tim Abbott | 31b6e76 | 2009-04-30 20:06:11 -0400 | [diff] [blame] | 36 | # .section ".sched.text", "ax" |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 37 | # [...] |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 38 | # func1: |
| 39 | # [...] |
| 40 | # call mcount (offset: 0x10) |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 41 | # [...] |
| 42 | # ret |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 43 | # .globl fun2 |
| 44 | # func2: (offset: 0x20) |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 45 | # [...] |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 46 | # [...] |
| 47 | # ret |
| 48 | # func3: |
| 49 | # [...] |
| 50 | # call mcount (offset: 0x30) |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 51 | # [...] |
| 52 | # |
| 53 | # Both relocation offsets for the mcounts in the above example will be |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 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: |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 56 | # |
| 57 | # .section __mcount_loc |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 58 | # .quad func2 - 0x10 |
| 59 | # .quad func2 + 0x10 |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 60 | # |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 61 | # We can then compile this tmp.s into tmp.o, and link it back to the original |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 62 | # object. |
| 63 | # |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 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: |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 67 | # |
Tim Abbott | 31b6e76 | 2009-04-30 20:06:11 -0400 | [diff] [blame] | 68 | # .section ".sched.text", "ax" |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 69 | # func1: |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 70 | # [...] |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 71 | # call mcount (offset: 0x10) |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 72 | # [...] |
| 73 | # ret |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 74 | # func2: |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 75 | # [...] |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 76 | # call mcount (offset: 0x20) |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 77 | # [...] |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 78 | # .section "other.section" |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 79 | # |
| 80 | # If we make the tmp.s the same as above, when we link together with |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 81 | # the original object, we will end up with two symbols for func1: |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 82 | # one local, one global. After final compile, we will end up with |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 83 | # an undefined reference to func1 or a wrong reference to another global |
| 84 | # func1 in other files. |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 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 |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 88 | # file after it is linked together. To do this, we convert func1 |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 89 | # into a global symbol before linking tmp.o. Then after we link tmp.o |
Li Hong | d49f6aa | 2009-10-28 13:01:38 +0800 | [diff] [blame] | 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. |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 92 | # |
| 93 | # Here are the steps we take: |
| 94 | # |
Li Hong | 306dcf4 | 2009-10-28 13:06:19 +0800 | [diff] [blame] | 95 | # 1) Record all the local and weak symbols by using 'nm' |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 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 Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 105 | # 8) Link the object with the list object. |
| 106 | # 9) Move the result back to the original object. |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 107 | # |
| 108 | |
| 109 | use strict; |
| 110 | |
| 111 | my $P = $0; |
| 112 | $P =~ s@.*/@@g; |
| 113 | |
| 114 | my $V = '0.1'; |
| 115 | |
Wu Zhangjin | e6299d2 | 2009-11-20 20:34:31 +0800 | [diff] [blame] | 116 | if ($#ARGV != 11) { |
| 117 | print "usage: $P arch endian bits objdump objcopy cc ld nm rm mv is_module inputfile\n"; |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 118 | print "version: $V\n"; |
| 119 | exit(1); |
| 120 | } |
| 121 | |
Wu Zhangjin | e6299d2 | 2009-11-20 20:34:31 +0800 | [diff] [blame] | 122 | my ($arch, $endian, $bits, $objdump, $objcopy, $cc, |
Shaohua Li | 18c167f | 2009-01-12 10:00:51 +0800 | [diff] [blame] | 123 | $ld, $nm, $rm, $mv, $is_module, $inputfile) = @ARGV; |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 124 | |
Shaohua Li | 25aac9d | 2009-01-09 11:29:40 +0800 | [diff] [blame] | 125 | # This file refers to mcount and shouldn't be ftraced, so lets' ignore it |
Li Hong | bdd3b05 | 2009-10-28 13:03:32 +0800 | [diff] [blame] | 126 | if ($inputfile =~ m,kernel/trace/ftrace\.o$,) { |
Shaohua Li | 25aac9d | 2009-01-09 11:29:40 +0800 | [diff] [blame] | 127 | exit(0); |
| 128 | } |
| 129 | |
Steven Rostedt | 34698bc | 2008-10-23 09:32:58 -0400 | [diff] [blame] | 130 | # Acceptable sections to record. |
| 131 | my %text_sections = ( |
| 132 | ".text" => 1, |
Liming Wang | d144d5e | 2008-11-26 10:29:26 +0800 | [diff] [blame] | 133 | ".sched.text" => 1, |
| 134 | ".spinlock.text" => 1, |
Frederic Weisbecker | a0343e8 | 2008-12-09 23:53:16 +0100 | [diff] [blame] | 135 | ".irqentry.text" => 1, |
Jiri Olsa | 4d82894 | 2009-10-13 16:33:54 -0400 | [diff] [blame] | 136 | ".text.unlikely" => 1, |
Steven Rostedt | 34698bc | 2008-10-23 09:32:58 -0400 | [diff] [blame] | 137 | ); |
| 138 | |
Wolfram Sang | dfaa9e2 | 2010-01-05 21:41:22 +0100 | [diff] [blame] | 139 | # Note: we are nice to C-programmers here, thus we skip the '||='-idiom. |
| 140 | $objdump = 'objdump' if (!$objdump); |
| 141 | $objcopy = 'objcopy' if (!$objcopy); |
| 142 | $cc = 'gcc' if (!$cc); |
| 143 | $ld = 'ld' if (!$ld); |
| 144 | $nm = 'nm' if (!$nm); |
| 145 | $rm = 'rm' if (!$rm); |
| 146 | $mv = 'mv' if (!$mv); |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 147 | |
| 148 | #print STDERR "running: $P '$arch' '$objdump' '$objcopy' '$cc' '$ld' " . |
| 149 | # "'$nm' '$rm' '$mv' '$inputfile'\n"; |
| 150 | |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 151 | my %locals; # List of local (static) functions |
| 152 | my %weak; # List of weak functions |
| 153 | my %convert; # List of local functions used that needs conversion |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 154 | |
| 155 | my $type; |
Li Hong | 306dcf4 | 2009-10-28 13:06:19 +0800 | [diff] [blame] | 156 | my $local_regex; # Match a local function (return function) |
| 157 | my $weak_regex; # Match a weak function (return function) |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 158 | my $section_regex; # Find the start of a section |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 159 | my $function_regex; # Find the name of a function |
| 160 | # (return offset and func name) |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 161 | my $mcount_regex; # Find the call site to mcount (return offset) |
Mike Frysinger | 465c6cc | 2010-08-06 03:26:24 -0400 | [diff] [blame] | 162 | my $mcount_adjust; # Address adjustment to mcount offset |
Matt Fleming | 3a3d04a | 2008-11-20 21:49:52 +0000 | [diff] [blame] | 163 | my $alignment; # The .align value to use for $mcount_section |
Jim Radford | e58918a | 2008-11-20 19:48:39 -0800 | [diff] [blame] | 164 | my $section_type; # Section header plus possible alignment command |
Li Hong | 7b7edc2 | 2009-10-28 13:04:21 +0800 | [diff] [blame] | 165 | my $can_use_local = 0; # If we can use local function references |
| 166 | |
Steven Rostedt | 638adb0 | 2009-11-17 10:48:25 -0500 | [diff] [blame] | 167 | # Shut up recordmcount if user has older objcopy |
| 168 | my $quiet_recordmcount = ".tmp_quiet_recordmcount"; |
| 169 | my $print_warning = 1; |
| 170 | $print_warning = 0 if ( -f $quiet_recordmcount); |
| 171 | |
Li Hong | 7b7edc2 | 2009-10-28 13:04:21 +0800 | [diff] [blame] | 172 | ## |
| 173 | # check_objcopy - whether objcopy supports --globalize-symbols |
| 174 | # |
| 175 | # --globalize-symbols came out in 2.17, we must test the version |
| 176 | # of objcopy, and if it is less than 2.17, then we can not |
| 177 | # record local functions. |
| 178 | sub check_objcopy |
| 179 | { |
| 180 | open (IN, "$objcopy --version |") or die "error running $objcopy"; |
| 181 | while (<IN>) { |
| 182 | if (/objcopy.*\s(\d+)\.(\d+)/) { |
| 183 | $can_use_local = 1 if ($1 > 2 || ($1 == 2 && $2 >= 17)); |
| 184 | last; |
| 185 | } |
| 186 | } |
| 187 | close (IN); |
| 188 | |
Steven Rostedt | 638adb0 | 2009-11-17 10:48:25 -0500 | [diff] [blame] | 189 | if (!$can_use_local && $print_warning) { |
Li Hong | 7b7edc2 | 2009-10-28 13:04:21 +0800 | [diff] [blame] | 190 | print STDERR "WARNING: could not find objcopy version or version " . |
| 191 | "is less than 2.17.\n" . |
Steven Rostedt | 638adb0 | 2009-11-17 10:48:25 -0500 | [diff] [blame] | 192 | "\tLocal function references are disabled.\n"; |
| 193 | open (QUIET, ">$quiet_recordmcount"); |
| 194 | printf QUIET "Disables the warning from recordmcount.pl\n"; |
| 195 | close QUIET; |
Li Hong | 7b7edc2 | 2009-10-28 13:04:21 +0800 | [diff] [blame] | 196 | } |
| 197 | } |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 198 | |
Jan Kiszka | b82a404 | 2010-01-11 11:31:44 +0100 | [diff] [blame] | 199 | if ($arch =~ /(x86(_64)?)|(i386)/) { |
Steven Rostedt | dce9d18 | 2008-10-23 09:32:57 -0400 | [diff] [blame] | 200 | if ($bits == 64) { |
| 201 | $arch = "x86_64"; |
| 202 | } else { |
| 203 | $arch = "i386"; |
| 204 | } |
| 205 | } |
| 206 | |
Steven Rostedt | c204f72 | 2008-11-20 15:07:34 -0500 | [diff] [blame] | 207 | # |
| 208 | # We base the defaults off of i386, the other archs may |
| 209 | # feel free to change them in the below if statements. |
| 210 | # |
Li Hong | 306dcf4 | 2009-10-28 13:06:19 +0800 | [diff] [blame] | 211 | $local_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)"; |
| 212 | $weak_regex = "^[0-9a-fA-F]+\\s+([wW])\\s+(\\S+)"; |
Steven Rostedt | c204f72 | 2008-11-20 15:07:34 -0500 | [diff] [blame] | 213 | $section_regex = "Disassembly of section\\s+(\\S+):"; |
| 214 | $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; |
| 215 | $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$"; |
Jim Radford | e58918a | 2008-11-20 19:48:39 -0800 | [diff] [blame] | 216 | $section_type = '@progbits'; |
Mike Frysinger | 465c6cc | 2010-08-06 03:26:24 -0400 | [diff] [blame] | 217 | $mcount_adjust = 0; |
Steven Rostedt | c204f72 | 2008-11-20 15:07:34 -0500 | [diff] [blame] | 218 | $type = ".long"; |
| 219 | |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 220 | if ($arch eq "x86_64") { |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 221 | $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount([+-]0x[0-9a-zA-Z]+)?\$"; |
| 222 | $type = ".quad"; |
Matt Fleming | 7d5222a | 2008-11-07 13:26:25 +0000 | [diff] [blame] | 223 | $alignment = 8; |
Steven Rostedt | d74fcd1 | 2008-08-15 11:40:24 -0400 | [diff] [blame] | 224 | |
| 225 | # force flags for this arch |
| 226 | $ld .= " -m elf_x86_64"; |
| 227 | $objdump .= " -M x86-64"; |
| 228 | $objcopy .= " -O elf64-x86-64"; |
| 229 | $cc .= " -m64"; |
| 230 | |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 231 | } elsif ($arch eq "i386") { |
Matt Fleming | 7d5222a | 2008-11-07 13:26:25 +0000 | [diff] [blame] | 232 | $alignment = 4; |
Steven Rostedt | d74fcd1 | 2008-08-15 11:40:24 -0400 | [diff] [blame] | 233 | |
| 234 | # force flags for this arch |
| 235 | $ld .= " -m elf_i386"; |
| 236 | $objdump .= " -M i386"; |
| 237 | $objcopy .= " -O elf32-i386"; |
| 238 | $cc .= " -m32"; |
| 239 | |
Heiko Carstens | dfd9f7a | 2009-06-12 10:26:44 +0200 | [diff] [blame] | 240 | } elsif ($arch eq "s390" && $bits == 32) { |
| 241 | $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_390_32\\s+_mcount\$"; |
| 242 | $alignment = 4; |
| 243 | $ld .= " -m elf_s390"; |
| 244 | $cc .= " -m31"; |
| 245 | |
| 246 | } elsif ($arch eq "s390" && $bits == 64) { |
| 247 | $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_390_(PC|PLT)32DBL\\s+_mcount\\+0x2\$"; |
| 248 | $alignment = 8; |
| 249 | $type = ".quad"; |
| 250 | $ld .= " -m elf64_s390"; |
| 251 | $cc .= " -m64"; |
| 252 | |
Matt Fleming | 0da85c0 | 2008-11-12 20:11:47 +0900 | [diff] [blame] | 253 | } elsif ($arch eq "sh") { |
Matt Fleming | 3a3d04a | 2008-11-20 21:49:52 +0000 | [diff] [blame] | 254 | $alignment = 2; |
Matt Fleming | 0da85c0 | 2008-11-12 20:11:47 +0900 | [diff] [blame] | 255 | |
| 256 | # force flags for this arch |
| 257 | $ld .= " -m shlelf_linux"; |
| 258 | $objcopy .= " -O elf32-sh-linux"; |
| 259 | $cc .= " -m32"; |
| 260 | |
Steven Rostedt | 42e007d | 2008-11-20 07:16:16 -0800 | [diff] [blame] | 261 | } elsif ($arch eq "powerpc") { |
Li Hong | 306dcf4 | 2009-10-28 13:06:19 +0800 | [diff] [blame] | 262 | $local_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\.?\\S+)"; |
Steven Rostedt | 42e007d | 2008-11-20 07:16:16 -0800 | [diff] [blame] | 263 | $function_regex = "^([0-9a-fA-F]+)\\s+<(\\.?.*?)>:"; |
| 264 | $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s\\.?_mcount\$"; |
Steven Rostedt | c204f72 | 2008-11-20 15:07:34 -0500 | [diff] [blame] | 265 | |
Steven Rostedt | 42e007d | 2008-11-20 07:16:16 -0800 | [diff] [blame] | 266 | if ($bits == 64) { |
| 267 | $type = ".quad"; |
Steven Rostedt | 42e007d | 2008-11-20 07:16:16 -0800 | [diff] [blame] | 268 | } |
| 269 | |
Jim Radford | e58918a | 2008-11-20 19:48:39 -0800 | [diff] [blame] | 270 | } elsif ($arch eq "arm") { |
| 271 | $alignment = 2; |
| 272 | $section_type = '%progbits'; |
Rabin Vincent | 3b6c223 | 2010-08-10 19:43:28 +0100 | [diff] [blame^] | 273 | $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_ARM_(CALL|PC24)" . |
| 274 | "\\s+(__gnu_mcount_nc|mcount)\$"; |
Jim Radford | e58918a | 2008-11-20 19:48:39 -0800 | [diff] [blame] | 275 | |
Shaohua Li | 418071e | 2009-01-09 11:29:44 +0800 | [diff] [blame] | 276 | } elsif ($arch eq "ia64") { |
| 277 | $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$"; |
| 278 | $type = "data8"; |
| 279 | |
| 280 | if ($is_module eq "0") { |
| 281 | $cc .= " -mconstant-gp"; |
| 282 | } |
David S. Miller | 9be12f9 | 2009-06-13 01:03:24 -0700 | [diff] [blame] | 283 | } elsif ($arch eq "sparc64") { |
| 284 | # In the objdump output there are giblets like: |
| 285 | # 0000000000000000 <igmp_net_exit-0x18>: |
| 286 | # As there's some data blobs that get emitted into the |
| 287 | # text section before the first instructions and the first |
| 288 | # real symbols. We don't want to match that, so to combat |
| 289 | # this we use '\w' so we'll match just plain symbol names, |
| 290 | # and not those that also include hex offsets inside of the |
| 291 | # '<>' brackets. Actually the generic function_regex setting |
| 292 | # could safely use this too. |
| 293 | $function_regex = "^([0-9a-fA-F]+)\\s+<(\\w*?)>:"; |
| 294 | |
| 295 | # Sparc64 calls '_mcount' instead of plain 'mcount'. |
| 296 | $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$"; |
| 297 | |
| 298 | $alignment = 8; |
| 299 | $type = ".xword"; |
| 300 | $ld .= " -m elf64_sparc"; |
| 301 | $cc .= " -m64"; |
| 302 | $objcopy .= " -O elf64-sparc"; |
Wu Zhangjin | 538f195 | 2009-11-20 20:34:32 +0800 | [diff] [blame] | 303 | } elsif ($arch eq "mips") { |
| 304 | # To enable module support, we need to enable the -mlong-calls option |
| 305 | # of gcc for module, after using this option, we can not get the real |
| 306 | # offset of the calling to _mcount, but the offset of the lui |
| 307 | # instruction or the addiu one. herein, we record the address of the |
| 308 | # first one, and then we can replace this instruction by a branch |
| 309 | # instruction to jump over the profiling function to filter the |
| 310 | # indicated functions, or swith back to the lui instruction to trace |
| 311 | # them, which means dynamic tracing. |
| 312 | # |
| 313 | # c: 3c030000 lui v1,0x0 |
| 314 | # c: R_MIPS_HI16 _mcount |
| 315 | # c: R_MIPS_NONE *ABS* |
| 316 | # c: R_MIPS_NONE *ABS* |
| 317 | # 10: 64630000 daddiu v1,v1,0 |
| 318 | # 10: R_MIPS_LO16 _mcount |
| 319 | # 10: R_MIPS_NONE *ABS* |
| 320 | # 10: R_MIPS_NONE *ABS* |
| 321 | # 14: 03e0082d move at,ra |
| 322 | # 18: 0060f809 jalr v1 |
| 323 | # |
| 324 | # for the kernel: |
| 325 | # |
| 326 | # 10: 03e0082d move at,ra |
| 327 | # 14: 0c000000 jal 0 <loongson_halt> |
| 328 | # 14: R_MIPS_26 _mcount |
| 329 | # 14: R_MIPS_NONE *ABS* |
| 330 | # 14: R_MIPS_NONE *ABS* |
| 331 | # 18: 00020021 nop |
| 332 | if ($is_module eq "0") { |
David Daney | a484e54 | 2010-07-09 14:52:05 -0700 | [diff] [blame] | 333 | $mcount_regex = "^\\s*([0-9a-fA-F]+): R_MIPS_26\\s+_mcount\$"; |
Wu Zhangjin | 538f195 | 2009-11-20 20:34:32 +0800 | [diff] [blame] | 334 | } else { |
| 335 | $mcount_regex = "^\\s*([0-9a-fA-F]+): R_MIPS_HI16\\s+_mcount\$"; |
| 336 | } |
| 337 | $objdump .= " -Melf-trad".$endian."mips "; |
| 338 | |
| 339 | if ($endian eq "big") { |
| 340 | $endian = " -EB "; |
| 341 | $ld .= " -melf".$bits."btsmip"; |
| 342 | } else { |
| 343 | $endian = " -EL "; |
| 344 | $ld .= " -melf".$bits."ltsmip"; |
| 345 | } |
| 346 | |
| 347 | $cc .= " -mno-abicalls -fno-pic -mabi=" . $bits . $endian; |
| 348 | $ld .= $endian; |
| 349 | |
| 350 | if ($bits == 64) { |
| 351 | $function_regex = |
| 352 | "^([0-9a-fA-F]+)\\s+<(.|[^\$]L.*?|\$[^L].*?|[^\$][^L].*?)>:"; |
| 353 | $type = ".dword"; |
| 354 | } |
Michal Simek | 7d241ff | 2009-12-10 14:15:44 +0100 | [diff] [blame] | 355 | } elsif ($arch eq "microblaze") { |
| 356 | # Microblaze calls '_mcount' instead of plain 'mcount'. |
| 357 | $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$"; |
Mike Frysinger | 465c6cc | 2010-08-06 03:26:24 -0400 | [diff] [blame] | 358 | } elsif ($arch eq "blackfin") { |
| 359 | $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s__mcount\$"; |
| 360 | $mcount_adjust = -4; |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 361 | } else { |
| 362 | die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD"; |
| 363 | } |
| 364 | |
| 365 | my $text_found = 0; |
| 366 | my $read_function = 0; |
| 367 | my $opened = 0; |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 368 | my $mcount_section = "__mcount_loc"; |
| 369 | |
| 370 | my $dirname; |
| 371 | my $filename; |
| 372 | my $prefix; |
| 373 | my $ext; |
| 374 | |
| 375 | if ($inputfile =~ m,^(.*)/([^/]*)$,) { |
| 376 | $dirname = $1; |
| 377 | $filename = $2; |
| 378 | } else { |
| 379 | $dirname = "."; |
| 380 | $filename = $inputfile; |
| 381 | } |
| 382 | |
| 383 | if ($filename =~ m,^(.*)(\.\S),) { |
| 384 | $prefix = $1; |
| 385 | $ext = $2; |
| 386 | } else { |
| 387 | $prefix = $filename; |
| 388 | $ext = ""; |
| 389 | } |
| 390 | |
| 391 | my $mcount_s = $dirname . "/.tmp_mc_" . $prefix . ".s"; |
| 392 | my $mcount_o = $dirname . "/.tmp_mc_" . $prefix . ".o"; |
| 393 | |
Li Hong | 7b7edc2 | 2009-10-28 13:04:21 +0800 | [diff] [blame] | 394 | check_objcopy(); |
Steven Rostedt | f2f8458 | 2008-08-25 14:52:11 -0400 | [diff] [blame] | 395 | |
Steven Rostedt | f2f8458 | 2008-08-25 14:52:11 -0400 | [diff] [blame] | 396 | # |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 397 | # Step 1: find all the local (static functions) and weak symbols. |
Li Hong | 306dcf4 | 2009-10-28 13:06:19 +0800 | [diff] [blame] | 398 | # 't' is local, 'w/W' is weak |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 399 | # |
| 400 | open (IN, "$nm $inputfile|") || die "error running $nm"; |
| 401 | while (<IN>) { |
Li Hong | 306dcf4 | 2009-10-28 13:06:19 +0800 | [diff] [blame] | 402 | if (/$local_regex/) { |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 403 | $locals{$1} = 1; |
Li Hong | 306dcf4 | 2009-10-28 13:06:19 +0800 | [diff] [blame] | 404 | } elsif (/$weak_regex/) { |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 405 | $weak{$2} = $1; |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 406 | } |
| 407 | } |
| 408 | close(IN); |
| 409 | |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 410 | my @offsets; # Array of offsets of mcount callers |
| 411 | my $ref_func; # reference function to use for offsets |
| 412 | my $offset = 0; # offset of ref_func to section beginning |
| 413 | |
| 414 | ## |
| 415 | # update_funcs - print out the current mcount callers |
| 416 | # |
| 417 | # Go through the list of offsets to callers and write them to |
| 418 | # the output file in a format that can be read by an assembler. |
| 419 | # |
| 420 | sub update_funcs |
| 421 | { |
Li Hong | 6092858 | 2009-10-28 13:07:03 +0800 | [diff] [blame] | 422 | return unless ($ref_func and @offsets); |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 423 | |
Li Hong | c4b8ac2 | 2009-10-28 13:07:43 +0800 | [diff] [blame] | 424 | # Sanity check on weak function. A weak function may be overwritten by |
| 425 | # another function of the same name, making all these offsets incorrect. |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 426 | if (defined $weak{$ref_func}) { |
Li Hong | c4b8ac2 | 2009-10-28 13:07:43 +0800 | [diff] [blame] | 427 | die "$inputfile: ERROR: referencing weak function" . |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 428 | " $ref_func for mcount\n"; |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 429 | } |
| 430 | |
| 431 | # is this function static? If so, note this fact. |
| 432 | if (defined $locals{$ref_func}) { |
Steven Rostedt | f2f8458 | 2008-08-25 14:52:11 -0400 | [diff] [blame] | 433 | |
| 434 | # only use locals if objcopy supports globalize-symbols |
Li Hong | 7b7edc2 | 2009-10-28 13:04:21 +0800 | [diff] [blame] | 435 | if (!$can_use_local) { |
Steven Rostedt | f2f8458 | 2008-08-25 14:52:11 -0400 | [diff] [blame] | 436 | return; |
| 437 | } |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 438 | $convert{$ref_func} = 1; |
| 439 | } |
| 440 | |
| 441 | # Loop through all the mcount caller offsets and print a reference |
| 442 | # to the caller based from the ref_func. |
Wolfram Sang | dc4f884 | 2010-01-05 19:27:51 +0100 | [diff] [blame] | 443 | if (!$opened) { |
| 444 | open(FILE, ">$mcount_s") || die "can't create $mcount_s\n"; |
| 445 | $opened = 1; |
| 446 | print FILE "\t.section $mcount_section,\"a\",$section_type\n"; |
| 447 | print FILE "\t.align $alignment\n" if (defined($alignment)); |
| 448 | } |
| 449 | foreach my $cur_offset (@offsets) { |
| 450 | printf FILE "\t%s %s + %d\n", $type, $ref_func, $cur_offset - $offset; |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 451 | } |
| 452 | } |
| 453 | |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 454 | # |
| 455 | # Step 2: find the sections and mcount call sites |
| 456 | # |
Steven Rostedt | b43f709 | 2009-01-16 23:18:31 -0500 | [diff] [blame] | 457 | open(IN, "$objdump -hdr $inputfile|") || die "error running $objdump"; |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 458 | |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 459 | my $text; |
| 460 | |
Li Hong | db24c7d | 2009-10-28 13:05:23 +0800 | [diff] [blame] | 461 | |
| 462 | # read headers first |
Steven Rostedt | b43f709 | 2009-01-16 23:18:31 -0500 | [diff] [blame] | 463 | my $read_headers = 1; |
| 464 | |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 465 | while (<IN>) { |
Li Hong | db24c7d | 2009-10-28 13:05:23 +0800 | [diff] [blame] | 466 | |
| 467 | if ($read_headers && /$mcount_section/) { |
| 468 | # |
| 469 | # Somehow the make process can execute this script on an |
| 470 | # object twice. If it does, we would duplicate the mcount |
| 471 | # section and it will cause the function tracer self test |
| 472 | # to fail. Check if the mcount section exists, and if it does, |
| 473 | # warn and exit. |
| 474 | # |
| 475 | print STDERR "ERROR: $mcount_section already in $inputfile\n" . |
| 476 | "\tThis may be an indication that your build is corrupted.\n" . |
| 477 | "\tDelete $inputfile and try again. If the same object file\n" . |
| 478 | "\tstill causes an issue, then disable CONFIG_DYNAMIC_FTRACE.\n"; |
| 479 | exit(-1); |
| 480 | } |
| 481 | |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 482 | # is it a section? |
| 483 | if (/$section_regex/) { |
Steven Rostedt | b43f709 | 2009-01-16 23:18:31 -0500 | [diff] [blame] | 484 | $read_headers = 0; |
Steven Rostedt | 34698bc | 2008-10-23 09:32:58 -0400 | [diff] [blame] | 485 | |
| 486 | # Only record text sections that we know are safe |
Wolfram Sang | dfaa9e2 | 2010-01-05 21:41:22 +0100 | [diff] [blame] | 487 | $read_function = defined($text_sections{$1}); |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 488 | # print out any recorded offsets |
Li Hong | 6092858 | 2009-10-28 13:07:03 +0800 | [diff] [blame] | 489 | update_funcs(); |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 490 | |
| 491 | # reset all markers and arrays |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 492 | $text_found = 0; |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 493 | undef($ref_func); |
| 494 | undef(@offsets); |
| 495 | |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 496 | # section found, now is this a start of a function? |
| 497 | } elsif ($read_function && /$function_regex/) { |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 498 | $text_found = 1; |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 499 | $text = $2; |
| 500 | |
| 501 | # if this is either a local function or a weak function |
| 502 | # keep looking for functions that are global that |
| 503 | # we can use safely. |
| 504 | if (!defined($locals{$text}) && !defined($weak{$text})) { |
| 505 | $ref_func = $text; |
| 506 | $read_function = 0; |
Matt Fleming | bd171d5 | 2009-07-23 17:16:15 +0100 | [diff] [blame] | 507 | $offset = hex $1; |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 508 | } else { |
| 509 | # if we already have a function, and this is weak, skip it |
Steven Rostedt | 3f6e968 | 2009-08-05 22:00:14 -0400 | [diff] [blame] | 510 | if (!defined($ref_func) && !defined($weak{$text}) && |
| 511 | # PPC64 can have symbols that start with .L and |
| 512 | # gcc considers these special. Don't use them! |
| 513 | $text !~ /^\.L/) { |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 514 | $ref_func = $text; |
Matt Fleming | bd171d5 | 2009-07-23 17:16:15 +0100 | [diff] [blame] | 515 | $offset = hex $1; |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 516 | } |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 517 | } |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 518 | } |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 519 | # is this a call site to mcount? If so, record it to print later |
| 520 | if ($text_found && /$mcount_regex/) { |
Mike Frysinger | 465c6cc | 2010-08-06 03:26:24 -0400 | [diff] [blame] | 521 | push(@offsets, (hex $1) + $mcount_adjust); |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 522 | } |
| 523 | } |
| 524 | |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 525 | # dump out anymore offsets that may have been found |
Li Hong | 6092858 | 2009-10-28 13:07:03 +0800 | [diff] [blame] | 526 | update_funcs(); |
Steven Rostedt | 8feff1c | 2008-08-20 10:07:35 -0400 | [diff] [blame] | 527 | |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 528 | # If we did not find any mcount callers, we are done (do nothing). |
| 529 | if (!$opened) { |
| 530 | exit(0); |
| 531 | } |
| 532 | |
| 533 | close(FILE); |
| 534 | |
| 535 | # |
| 536 | # Step 3: Compile the file that holds the list of call sites to mcount. |
| 537 | # |
| 538 | `$cc -o $mcount_o -c $mcount_s`; |
| 539 | |
| 540 | my @converts = keys %convert; |
| 541 | |
| 542 | # |
| 543 | # Step 4: Do we have sections that started with local functions? |
| 544 | # |
| 545 | if ($#converts >= 0) { |
| 546 | my $globallist = ""; |
| 547 | my $locallist = ""; |
| 548 | |
| 549 | foreach my $con (@converts) { |
| 550 | $globallist .= " --globalize-symbol $con"; |
| 551 | $locallist .= " --localize-symbol $con"; |
| 552 | } |
| 553 | |
| 554 | my $globalobj = $dirname . "/.tmp_gl_" . $filename; |
| 555 | my $globalmix = $dirname . "/.tmp_mx_" . $filename; |
| 556 | |
| 557 | # |
| 558 | # Step 5: set up each local function as a global |
| 559 | # |
| 560 | `$objcopy $globallist $inputfile $globalobj`; |
| 561 | |
| 562 | # |
| 563 | # Step 6: Link the global version to our list. |
| 564 | # |
| 565 | `$ld -r $globalobj $mcount_o -o $globalmix`; |
| 566 | |
| 567 | # |
| 568 | # Step 7: Convert the local functions back into local symbols |
| 569 | # |
| 570 | `$objcopy $locallist $globalmix $inputfile`; |
| 571 | |
| 572 | # Remove the temp files |
| 573 | `$rm $globalobj $globalmix`; |
| 574 | |
| 575 | } else { |
| 576 | |
| 577 | my $mix = $dirname . "/.tmp_mx_" . $filename; |
| 578 | |
| 579 | # |
| 580 | # Step 8: Link the object with our list of call sites object. |
| 581 | # |
| 582 | `$ld -r $inputfile $mcount_o -o $mix`; |
| 583 | |
| 584 | # |
| 585 | # Step 9: Move the result back to the original object. |
| 586 | # |
| 587 | `$mv $mix $inputfile`; |
| 588 | } |
| 589 | |
| 590 | # Clean up the temp files |
| 591 | `$rm $mcount_o $mcount_s`; |
| 592 | |
| 593 | exit(0); |