X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=scripts%2Frecordmcount.pl;h=090d300d7394d1d890057633826ff5f6b5f03eaa;hb=0487683096decad0720dfaf80b9d28173d5f6662;hp=0b1dc9f9bb0682a65d9158f8fb44012ea05464b1;hpb=d144d5ee6a265823d39f75ecfed351a516295183;p=safe%2Fjmp%2Flinux-2.6 diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl index 0b1dc9f..090d300 100755 --- a/scripts/recordmcount.pl +++ b/scripts/recordmcount.pl @@ -26,7 +26,7 @@ # which will also be the location of that section after final link. # e.g. # -# .section ".text.sched" +# .section ".sched.text", "ax" # .globl my_func # my_func: # [...] @@ -39,7 +39,7 @@ # [...] # # Both relocation offsets for the mcounts in the above example will be -# offset from .text.sched. If we make another file called tmp.s with: +# offset from .sched.text. If we make another file called tmp.s with: # # .section __mcount_loc # .quad my_func + 0x5 @@ -51,13 +51,12 @@ # But this gets hard if my_func is not globl (a static function). # In such a case we have: # -# .section ".text.sched" +# .section ".sched.text", "ax" # my_func: # [...] # call mcount (offset: 0x5) # [...] # ret -# .globl my_func # other_func: # [...] # call mcount (offset: 0x1b) @@ -100,20 +99,26 @@ $P =~ s@.*/@@g; my $V = '0.1'; -if ($#ARGV < 6) { - print "usage: $P arch objdump objcopy cc ld nm rm mv inputfile\n"; +if ($#ARGV < 7) { + print "usage: $P arch bits objdump objcopy cc ld nm rm mv is_module inputfile\n"; print "version: $V\n"; exit(1); } my ($arch, $bits, $objdump, $objcopy, $cc, - $ld, $nm, $rm, $mv, $inputfile) = @ARGV; + $ld, $nm, $rm, $mv, $is_module, $inputfile) = @ARGV; + +# This file refers to mcount and shouldn't be ftraced, so lets' ignore it +if ($inputfile eq "kernel/trace/ftrace.o") { + exit(0); +} # Acceptable sections to record. my %text_sections = ( ".text" => 1, ".sched.text" => 1, ".spinlock.text" => 1, + ".irqentry.text" => 1, ); $objdump = "objdump" if ((length $objdump) == 0); @@ -179,6 +184,19 @@ if ($arch eq "x86_64") { $objcopy .= " -O elf32-i386"; $cc .= " -m32"; +} elsif ($arch eq "s390" && $bits == 32) { + $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_390_32\\s+_mcount\$"; + $alignment = 4; + $ld .= " -m elf_s390"; + $cc .= " -m31"; + +} elsif ($arch eq "s390" && $bits == 64) { + $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_390_(PC|PLT)32DBL\\s+_mcount\\+0x2\$"; + $alignment = 8; + $type = ".quad"; + $ld .= " -m elf64_s390"; + $cc .= " -m64"; + } elsif ($arch eq "sh") { $alignment = 2; @@ -200,6 +218,33 @@ if ($arch eq "x86_64") { $alignment = 2; $section_type = '%progbits'; +} elsif ($arch eq "ia64") { + $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$"; + $type = "data8"; + + if ($is_module eq "0") { + $cc .= " -mconstant-gp"; + } +} elsif ($arch eq "sparc64") { + # In the objdump output there are giblets like: + # 0000000000000000 : + # As there's some data blobs that get emitted into the + # text section before the first instructions and the first + # real symbols. We don't want to match that, so to combat + # this we use '\w' so we'll match just plain symbol names, + # and not those that also include hex offsets inside of the + # '<>' brackets. Actually the generic function_regex setting + # could safely use this too. + $function_regex = "^([0-9a-fA-F]+)\\s+<(\\w*?)>:"; + + # Sparc64 calls '_mcount' instead of plain 'mcount'. + $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$"; + + $alignment = 8; + $type = ".xword"; + $ld .= " -m elf64_sparc"; + $cc .= " -m64"; + $objcopy .= " -O elf64-sparc"; } else { die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD"; } @@ -262,7 +307,6 @@ if (!$found_version) { "\tDisabling local function references.\n"; } - # # Step 1: find all the local (static functions) and weak symbols. # 't' is local, 'w/W' is weak (we never use a weak function) @@ -330,13 +374,16 @@ sub update_funcs # # Step 2: find the sections and mcount call sites # -open(IN, "$objdump -dr $inputfile|") || die "error running $objdump"; +open(IN, "$objdump -hdr $inputfile|") || die "error running $objdump"; my $text; +my $read_headers = 1; + while () { # is it a section? if (/$section_regex/) { + $read_headers = 0; # Only record text sections that we know are safe if (defined($text_sections{$1})) { @@ -345,7 +392,7 @@ while () { $read_function = 0; } # print out any recorded offsets - update_funcs() if ($text_found); + update_funcs() if (defined($ref_func)); # reset all markers and arrays $text_found = 0; @@ -355,7 +402,6 @@ while () { # section found, now is this a start of a function? } elsif ($read_function && /$function_regex/) { $text_found = 1; - $offset = hex $1; $text = $2; # if this is either a local function or a weak function @@ -364,12 +410,30 @@ while () { if (!defined($locals{$text}) && !defined($weak{$text})) { $ref_func = $text; $read_function = 0; + $offset = hex $1; } else { # if we already have a function, and this is weak, skip it - if (!defined($ref_func) || !defined($weak{$text})) { + if (!defined($ref_func) && !defined($weak{$text}) && + # PPC64 can have symbols that start with .L and + # gcc considers these special. Don't use them! + $text !~ /^\.L/) { $ref_func = $text; + $offset = hex $1; } } + } elsif ($read_headers && /$mcount_section/) { + # + # Somehow the make process can execute this script on an + # object twice. If it does, we would duplicate the mcount + # section and it will cause the function tracer self test + # to fail. Check if the mcount section exists, and if it does, + # warn and exit. + # + print STDERR "ERROR: $mcount_section already in $inputfile\n" . + "\tThis may be an indication that your build is corrupted.\n" . + "\tDelete $inputfile and try again. If the same object file\n" . + "\tstill causes an issue, then disable CONFIG_DYNAMIC_FTRACE.\n"; + exit(-1); } # is this a call site to mcount? If so, record it to print later @@ -379,7 +443,7 @@ while () { } # dump out anymore offsets that may have been found -update_funcs() if ($text_found); +update_funcs() if (defined($ref_func)); # If we did not find any mcount callers, we are done (do nothing). if (!$opened) {