From 7d5222a6afa4e429f55df8c086adb747837cbdf5 Mon Sep 17 00:00:00 2001 From: Matt Fleming Date: Fri, 7 Nov 2008 13:26:25 +0000 Subject: ftrace: align __mcount_loc sections Impact: add alignment option for recordmcount.pl script Align the __mcount_loc sections so that architectures with strict alignment requirements need not worry about performing unaligned accesses. This fixes an issue where I was seeing unaligned accesses, which are not supported on our architecture (the results of an unaligned access are undefined). Signed-off-by: Matt Fleming Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar --- scripts/recordmcount.pl | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'scripts/recordmcount.pl') diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl index 6b9fe3eb836..eeac71c87c6 100755 --- a/scripts/recordmcount.pl +++ b/scripts/recordmcount.pl @@ -134,6 +134,7 @@ my $section_regex; # Find the start of a section my $function_regex; # Find the name of a function # (return offset and func name) my $mcount_regex; # Find the call site to mcount (return offset) +my $alignment; # The .align value to use for $mcount_section if ($arch eq "x86") { if ($bits == 64) { @@ -148,6 +149,7 @@ if ($arch eq "x86_64") { $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount([+-]0x[0-9a-zA-Z]+)?\$"; $type = ".quad"; + $alignment = 8; # force flags for this arch $ld .= " -m elf_x86_64"; @@ -160,6 +162,7 @@ if ($arch eq "x86_64") { $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$"; $type = ".long"; + $alignment = 4; # force flags for this arch $ld .= " -m elf_i386"; @@ -288,6 +291,7 @@ sub update_funcs open(FILE, ">$mcount_s") || die "can't create $mcount_s\n"; $opened = 1; print FILE "\t.section $mcount_section,\"a\",\@progbits\n"; + print FILE "\t.align $alignment\n"; } printf FILE "\t%s %s + %d\n", $type, $ref_func, $offsets[$i] - $offset; } -- cgit v1.2.3-70-g09d2 From 0da85c09b44bfea07e63ed5324aabc7cfc8a889a Mon Sep 17 00:00:00 2001 From: Matt Fleming Date: Wed, 12 Nov 2008 20:11:47 +0900 Subject: sh: dynamic ftrace support. First cut at dynamic ftrace support. [ Steven Rostedt - only updated the recordmcount.pl file. There are updates for PowerPC that will conflict with this, and we need to base off of these changes. ] Signed-off-by: Matt Fleming Signed-off-by: Paul Mundt Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar --- scripts/recordmcount.pl | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'scripts/recordmcount.pl') diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl index eeac71c87c6..9f75438f65e 100755 --- a/scripts/recordmcount.pl +++ b/scripts/recordmcount.pl @@ -170,6 +170,17 @@ if ($arch eq "x86_64") { $objcopy .= " -O elf32-i386"; $cc .= " -m32"; +} elsif ($arch eq "sh") { + $section_regex = "Disassembly of section\\s+(\\S+):"; + $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; + $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$"; + $type = ".long"; + + # force flags for this arch + $ld .= " -m shlelf_linux"; + $objcopy .= " -O elf32-sh-linux"; + $cc .= " -m32"; + } else { die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD"; } -- cgit v1.2.3-70-g09d2 From 42e007d0400155fbc12c5344c808889e6ae33d32 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Thu, 20 Nov 2008 07:16:16 -0800 Subject: ftrace: add support for powerpc to recordmcount.pl script Impact: Add PowerPC port to recordmcount.pl script This patch updates the recordmcount.pl script to process PowerPC. Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar --- scripts/recordmcount.pl | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) (limited to 'scripts/recordmcount.pl') diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl index 9f75438f65e..7ec032e3c3f 100755 --- a/scripts/recordmcount.pl +++ b/scripts/recordmcount.pl @@ -130,6 +130,7 @@ my %weak; # List of weak functions my %convert; # List of local functions used that needs conversion my $type; +my $nm_regex; # Find the local functions (return function) my $section_regex; # Find the start of a section my $function_regex; # Find the name of a function # (return offset and func name) @@ -145,6 +146,7 @@ if ($arch eq "x86") { } if ($arch eq "x86_64") { + $nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)"; $section_regex = "Disassembly of section\\s+(\\S+):"; $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount([+-]0x[0-9a-zA-Z]+)?\$"; @@ -158,6 +160,7 @@ if ($arch eq "x86_64") { $cc .= " -m64"; } elsif ($arch eq "i386") { + $nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)"; $section_regex = "Disassembly of section\\s+(\\S+):"; $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$"; @@ -171,6 +174,7 @@ if ($arch eq "x86_64") { $cc .= " -m32"; } elsif ($arch eq "sh") { + $nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)"; $section_regex = "Disassembly of section\\s+(\\S+):"; $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$"; @@ -181,6 +185,17 @@ if ($arch eq "x86_64") { $objcopy .= " -O elf32-sh-linux"; $cc .= " -m32"; +} elsif ($arch eq "powerpc") { + $nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\.?\\S+)"; + $section_regex = "Disassembly of section\\s+(\\S+):"; + $function_regex = "^([0-9a-fA-F]+)\\s+<(\\.?.*?)>:"; + $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s\\.?_mcount\$"; + if ($bits == 64) { + $type = ".quad"; + } else { + $type = ".long"; + } + } else { die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD"; } @@ -250,7 +265,7 @@ if (!$found_version) { # open (IN, "$nm $inputfile|") || die "error running $nm"; while () { - if (/^[0-9a-fA-F]+\s+t\s+(\S+)/) { + if (/$nm_regex/) { $locals{$1} = 1; } elsif (/^[0-9a-fA-F]+\s+([wW])\s+(\S+)/) { $weak{$2} = $1; @@ -302,7 +317,7 @@ sub update_funcs open(FILE, ">$mcount_s") || die "can't create $mcount_s\n"; $opened = 1; print FILE "\t.section $mcount_section,\"a\",\@progbits\n"; - print FILE "\t.align $alignment\n"; + print FILE "\t.align $alignment\n" if (defined($alignment)); } printf FILE "\t%s %s + %d\n", $type, $ref_func, $offsets[$i] - $offset; } -- cgit v1.2.3-70-g09d2 From c204f7264c7de85aecd3638dc8fe07aba6d1fff5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Thu, 20 Nov 2008 15:07:34 -0500 Subject: ftrace: create default variables for archs in recordmcount.pl Impact: cleanup of recordmcount.pl Now that more architectures are being ported to the MCOUNT_RECORD method, there is no reason to have each declare their own arch specific variable if most of them share the same value. This patch creates a set of default values for the arch specific variables based off of i386. Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar --- scripts/recordmcount.pl | 27 +++++++++++---------------- 1 file changed, 11 insertions(+), 16 deletions(-) (limited to 'scripts/recordmcount.pl') diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl index 7ec032e3c3f..c5c58ac90c0 100755 --- a/scripts/recordmcount.pl +++ b/scripts/recordmcount.pl @@ -145,10 +145,17 @@ if ($arch eq "x86") { } } +# +# We base the defaults off of i386, the other archs may +# feel free to change them in the below if statements. +# +$nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)"; +$section_regex = "Disassembly of section\\s+(\\S+):"; +$function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; +$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$"; +$type = ".long"; + if ($arch eq "x86_64") { - $nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)"; - $section_regex = "Disassembly of section\\s+(\\S+):"; - $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount([+-]0x[0-9a-zA-Z]+)?\$"; $type = ".quad"; $alignment = 8; @@ -160,11 +167,6 @@ if ($arch eq "x86_64") { $cc .= " -m64"; } elsif ($arch eq "i386") { - $nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)"; - $section_regex = "Disassembly of section\\s+(\\S+):"; - $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; - $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$"; - $type = ".long"; $alignment = 4; # force flags for this arch @@ -174,11 +176,6 @@ if ($arch eq "x86_64") { $cc .= " -m32"; } elsif ($arch eq "sh") { - $nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)"; - $section_regex = "Disassembly of section\\s+(\\S+):"; - $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; - $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$"; - $type = ".long"; # force flags for this arch $ld .= " -m shlelf_linux"; @@ -187,13 +184,11 @@ if ($arch eq "x86_64") { } elsif ($arch eq "powerpc") { $nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\.?\\S+)"; - $section_regex = "Disassembly of section\\s+(\\S+):"; $function_regex = "^([0-9a-fA-F]+)\\s+<(\\.?.*?)>:"; $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s\\.?_mcount\$"; + if ($bits == 64) { $type = ".quad"; - } else { - $type = ".long"; } } else { -- cgit v1.2.3-70-g09d2 From 3a3d04aed05add2247ea2ba5da5f90dba4062f3f Mon Sep 17 00:00:00 2001 From: Matt Fleming Date: Thu, 20 Nov 2008 21:49:52 +0000 Subject: ftrace: specify $alignment for sh architecture Impact: extend scripts/recordmcount.pl with default alignment for SH Set $alignment=2 for the sh architecture so that a ".align 2" directive will be emitted for all __mcount_loc sections. Fix a whitspace error while I'm here (converted spaces to tabs). Signed-off-by: Matt Fleming Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar --- scripts/recordmcount.pl | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'scripts/recordmcount.pl') diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl index c5c58ac90c0..03b6af1388e 100755 --- a/scripts/recordmcount.pl +++ b/scripts/recordmcount.pl @@ -135,7 +135,7 @@ my $section_regex; # Find the start of a section my $function_regex; # Find the name of a function # (return offset and func name) my $mcount_regex; # Find the call site to mcount (return offset) -my $alignment; # The .align value to use for $mcount_section +my $alignment; # The .align value to use for $mcount_section if ($arch eq "x86") { if ($bits == 64) { @@ -176,6 +176,7 @@ if ($arch eq "x86_64") { $cc .= " -m32"; } elsif ($arch eq "sh") { + $alignment = 2; # force flags for this arch $ld .= " -m shlelf_linux"; -- cgit v1.2.3-70-g09d2 From e58918ab9d4cd375f6d842e6d88cf4d7a55cbfcc Mon Sep 17 00:00:00 2001 From: Jim Radford Date: Thu, 20 Nov 2008 19:48:39 -0800 Subject: ftrace: scripts/recordmcount.pl support for ARM Impact: extend scripts/recordmcount.pl to ARM Arm uses %progbits instead of @progbits and requires only 4 byte alignment. [ Thanks to Sam Ravnborg for mentioning that ARM uses %progbits ] Signed-off-by: Jim Radford Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar --- scripts/recordmcount.pl | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'scripts/recordmcount.pl') diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl index 03b6af1388e..0197e2f6b54 100755 --- a/scripts/recordmcount.pl +++ b/scripts/recordmcount.pl @@ -136,6 +136,7 @@ my $function_regex; # Find the name of a function # (return offset and func name) my $mcount_regex; # Find the call site to mcount (return offset) my $alignment; # The .align value to use for $mcount_section +my $section_type; # Section header plus possible alignment command if ($arch eq "x86") { if ($bits == 64) { @@ -153,6 +154,7 @@ $nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)"; $section_regex = "Disassembly of section\\s+(\\S+):"; $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$"; +$section_type = '@progbits'; $type = ".long"; if ($arch eq "x86_64") { @@ -192,6 +194,10 @@ if ($arch eq "x86_64") { $type = ".quad"; } +} elsif ($arch eq "arm") { + $alignment = 2; + $section_type = '%progbits'; + } else { die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD"; } @@ -312,7 +318,7 @@ sub update_funcs if (!$opened) { open(FILE, ">$mcount_s") || die "can't create $mcount_s\n"; $opened = 1; - print FILE "\t.section $mcount_section,\"a\",\@progbits\n"; + print FILE "\t.section $mcount_section,\"a\",$section_type\n"; print FILE "\t.align $alignment\n" if (defined($alignment)); } printf FILE "\t%s %s + %d\n", $type, $ref_func, $offsets[$i] - $offset; -- cgit v1.2.3-70-g09d2 From d144d5ee6a265823d39f75ecfed351a516295183 Mon Sep 17 00:00:00 2001 From: Liming Wang Date: Wed, 26 Nov 2008 10:29:26 +0800 Subject: ftrace: adding other non-leaving .text sections Impact: widen the scope of recordmcount.pl Besides .text section, there are three .text sections that won't be freed after kernel booting. They are: .sched.text, .spinlock.text and .kprobes.text, which contain functions we can trace. But the last section ".kprobes.text" is particular, which has been marked as "notrace", we ignore it. Thus we add other two sections. Signed-off-by: Liming Wang Acked-by: Steven Rostedt Signed-off-by: Ingo Molnar --- scripts/recordmcount.pl | 2 ++ 1 file changed, 2 insertions(+) (limited to 'scripts/recordmcount.pl') diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl index 0197e2f6b54..0b1dc9f9bb0 100755 --- a/scripts/recordmcount.pl +++ b/scripts/recordmcount.pl @@ -112,6 +112,8 @@ my ($arch, $bits, $objdump, $objcopy, $cc, # Acceptable sections to record. my %text_sections = ( ".text" => 1, + ".sched.text" => 1, + ".spinlock.text" => 1, ); $objdump = "objdump" if ((length $objdump) == 0); -- cgit v1.2.3-70-g09d2 From a0343e823184070f55364d8359f832dcb33c57c7 Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Tue, 9 Dec 2008 23:53:16 +0100 Subject: tracing/function-graph-tracer: add a new .irqentry.text section Impact: let the function-graph-tracer be aware of the irq entrypoints Add a new .irqentry.text section to store the irq entrypoints functions inside the same section. This way, the tracer will be able to signal an interrupts triggering on output by recognizing these entrypoints. Also, make this section recordable for dynamic tracing. Signed-off-by: Frederic Weisbecker Signed-off-by: Ingo Molnar --- arch/x86/kernel/vmlinux_64.lds.S | 1 + include/asm-generic/vmlinux.lds.h | 10 ++++++++++ scripts/recordmcount.pl | 1 + 3 files changed, 12 insertions(+) (limited to 'scripts/recordmcount.pl') diff --git a/arch/x86/kernel/vmlinux_64.lds.S b/arch/x86/kernel/vmlinux_64.lds.S index 46e05447405..1a614c0e6be 100644 --- a/arch/x86/kernel/vmlinux_64.lds.S +++ b/arch/x86/kernel/vmlinux_64.lds.S @@ -35,6 +35,7 @@ SECTIONS SCHED_TEXT LOCK_TEXT KPROBES_TEXT + IRQENTRY_TEXT *(.fixup) *(.gnu.warning) _etext = .; /* End of text section */ diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index eba835a2c2c..c61fab1dd2f 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -288,6 +288,16 @@ *(.kprobes.text) \ VMLINUX_SYMBOL(__kprobes_text_end) = .; +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +#define IRQENTRY_TEXT \ + ALIGN_FUNCTION(); \ + VMLINUX_SYMBOL(__irqentry_text_start) = .; \ + *(.irqentry.text) \ + VMLINUX_SYMBOL(__irqentry_text_end) = .; +#else +#define IRQENTRY_TEXT +#endif + /* Section used for early init (in .S files) */ #define HEAD_TEXT *(.head.text) diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl index 0b1dc9f9bb0..fe831412bea 100755 --- a/scripts/recordmcount.pl +++ b/scripts/recordmcount.pl @@ -114,6 +114,7 @@ my %text_sections = ( ".text" => 1, ".sched.text" => 1, ".spinlock.text" => 1, + ".irqentry.text" => 1, ); $objdump = "objdump" if ((length $objdump) == 0); -- cgit v1.2.3-70-g09d2