Implement GCC code coverage analysis

In order to provide some insight on what code is executed during
coreboot's run time and how well our test scenarios work, this
adds code coverage support to coreboot's ram stage. This should
be easily adaptable for payloads, and maybe even romstage.

See http://gcc.gnu.org/onlinedocs/gcc/Gcov.html for
more information.

To instrument coreboot, select CONFIG_COVERAGE ("Code coverage
support") in Kconfig, and recompile coreboot. coreboot will then
store its code coverage information into CBMEM, if possible.
Then, run "cbmem -CV" as root on the target system running the
instrumented coreboot binary. This will create a whole bunch of
.gcda files that contain coverage information. Tar them up, copy
them to your build system machine, and untar them. Then you can
use your favorite coverage utility (gcov, lcov, ...) to visualize
code coverage.

For a sneak peak of what will expect you, please take a look
at http://www.coreboot.org/~stepan/coreboot-coverage/

Change-Id: Ib287d8309878a1f5c4be770c38b1bc0bb3aa6ec7
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/2052
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Martin Roth <martin@se-eng.com>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/Makefile.inc b/Makefile.inc
index a066e25..3731797 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -99,6 +99,9 @@
 ifeq ($(CONFIG_TRACE),y)
 ramstage-c-ccopts:= -finstrument-functions
 endif
+ifeq ($(CONFIG_COVERAGE),y)
+ramstage-c-ccopts+=-fprofile-arcs -ftest-coverage
+endif
 
 ifeq ($(CONFIG_USE_BLOBS),y)
 forgetthis:=$(shell git submodule update --init --checkout 3rdparty)
diff --git a/documentation/gcov.txt b/documentation/gcov.txt
new file mode 100644
index 0000000..795f827
--- /dev/null
+++ b/documentation/gcov.txt
@@ -0,0 +1,177 @@
+This patch contains our local modifications for gcov-io.h and libgcov.c.
+The file gcov-iov.h is taken from a gcc build (produced at compile
+time). The file gcov-io.c is unchanged.
+
+--- gcc-4.7.2/gcc/gcov-io.h	2011-12-04 10:27:19.000000000 -0800
++++ coreboot/src/lib/gcov-io.h	2013-01-09 15:29:19.000000000 -0800
+@@ -163,6 +163,24 @@
+ #ifndef GCC_GCOV_IO_H
+ #define GCC_GCOV_IO_H
+ 
++#ifdef __COREBOOT__
++#define GCOV_LINKAGE /* nothing */
++/* We need the definitions for
++    BITS_PER_UNIT and
++    LONG_LONG_TYPE_SIZE
++   They are defined in gcc/defaults.h and gcc/config/<arch_depend_files>
++   (like, gcc/config/i386/i386.h). And it can be overridden by setting
++   in build scripts. Here I hardcoded the value for x86. */
++#define BITS_PER_UNIT 8
++#define LONG_LONG_TYPE_SIZE 64
++
++/* There are many gcc_assertions. Set the vaule to 1 if we want a warning
++   message if the assertion fails.  */
++#ifndef ENABLE_ASSERT_CHECKING
++#define ENABLE_ASSERT_CHECKING 1
++#endif
++#endif /* __COREBOOT__ */
++
+ #if IN_LIBGCOV
+ /* About the target */
+ 
+@@ -232,7 +250,9 @@
+    is not also used in a DSO.  */
+ #if IN_LIBGCOV
+ 
++#ifndef __COREBOOT__
+ #include "tconfig.h"
++#endif /* __COREBOOT__ */
+ 
+ #define gcov_var __gcov_var
+ #define gcov_open __gcov_open
+@@ -455,8 +475,10 @@
+ /* Register a new object file module.  */
+ extern void __gcov_init (struct gcov_info *) ATTRIBUTE_HIDDEN;
+ 
++#ifndef __COREBOOT__
+ /* Called before fork, to avoid double counting.  */
+ extern void __gcov_flush (void) ATTRIBUTE_HIDDEN;
++#endif
+ 
+ /* The merge function that just sums the counters.  */
+ extern void __gcov_merge_add (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
+--- gcc-4.7.2/libgcc/libgcov.c	2012-01-11 10:50:21.000000000 -0800
++++ coreboot/src/lib/libgcov.c	2013-01-09 15:32:37.000000000 -0800
+@@ -25,12 +25,41 @@
+ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+ <http://www.gnu.org/licenses/>.  */
+ 
++#define __COREBOOT__
++#ifdef __COREBOOT__
++#include <stdlib.h>
++#include <string.h>
++#include <console/console.h>
++#include <assert.h>
++typedef s32 pid_t;
++#define gcc_assert(x) ASSERT(x)
++#define fprintf(file, x...) printk(BIOS_ERR, x)
++#define alloca(size)   __builtin_alloca (size)
++#include "gcov-glue.c"
++
++/* Define MACROs to be used by coreboot compilation.  */
++# define L_gcov
++# define L_gcov_interval_profiler
++# define L_gcov_pow2_profiler
++# define L_gcov_one_value_profiler
++# define L_gcov_indirect_call_profiler
++# define L_gcov_average_profiler
++# define L_gcov_ior_profiler
++
++# define HAVE_CC_TLS 0
++# define __GCOV_KERNEL__
++
++# define IN_LIBGCOV 1
++# define IN_GCOV 0
++#else /* __COREBOOT__ */
+ #include "tconfig.h"
+ #include "tsystem.h"
+ #include "coretypes.h"
+ #include "tm.h"
+ #include "libgcc_tm.h"
++#endif /* __COREBOOT__ */
+ 
++#ifndef __COREBOOT__
+ #if defined(inhibit_libc)
+ #define IN_LIBGCOV (-1)
+ #else
+@@ -41,6 +70,7 @@
+ #define GCOV_LINKAGE /* nothing */
+ #endif
+ #endif
++#endif /* __COREBOOT__ */
+ #include "gcov-io.h"
+ 
+ #if defined(inhibit_libc)
+@@ -68,12 +98,17 @@
+ 
+ #else
+ 
++#ifndef __COREBOOT__
+ #include <string.h>
+ #if GCOV_LOCKED
+ #include <fcntl.h>
+ #include <errno.h>
+ #include <sys/stat.h>
+ #endif
++#else
++void __gcov_merge_add(gcov_type *counters  __attribute__ ((unused)),
++			unsigned n_counters __attribute__ ((unused))) {}
++#endif /* __COREBOOT__ */
+ 
+ #ifdef L_gcov
+ #include "gcov-io.c"
+@@ -99,6 +134,10 @@
+ static int
+ create_file_directory (char *filename)
+ {
++#ifdef __COREBOOT__
++  (void) filename;
++  return 0;
++#else
+ #if !defined(TARGET_POSIX_IO) && !defined(_WIN32)
+   (void) filename;
+   return -1;
+@@ -137,6 +176,7 @@
+       };
+   return 0;
+ #endif
++#endif
+ }
+ 
+ static struct gcov_fn_buffer *
+@@ -279,7 +319,7 @@
+   struct gcov_ctr_summary *cs_ptr;
+   const struct gcov_ctr_info *ci_ptr;
+   unsigned t_ix;
+-  int f_ix;
++  int f_ix = 0;
+   gcov_unsigned_t c_num;
+   const char *gcov_prefix;
+   int gcov_prefix_strip = 0;
+@@ -329,6 +369,7 @@
+ 	}
+     }
+ 
++#ifndef __COREBOOT__
+   {
+     /* Check if the level of dirs to strip off specified. */
+     char *tmp = getenv("GCOV_PREFIX_STRIP");
+@@ -352,6 +393,7 @@
+ 	prefix_length--;
+     }
+   else
++#endif
+     prefix_length = 0;
+ 
+   /* If no prefix was specified and a prefix stip, then we assume
+@@ -696,8 +738,10 @@
+       if (filename_length > gcov_max_filename)
+         gcov_max_filename = filename_length;
+ 
++#ifndef __COREBOOT__
+       if (!gcov_list)
+ 	atexit (gcov_exit);
++#endif
+ 
+       info->next = gcov_list;
+       gcov_list = info;
diff --git a/src/Kconfig b/src/Kconfig
index 0a94ed8..2c97327 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -194,6 +194,15 @@
 	  coreboot build for such a board can override this manually, but
 	  this option serves as warning that it might fail.
 
+config COVERAGE
+	bool "Code coverage support"
+	depends on COMPILER_GCC
+	default n
+	help
+	  Add code coverage support for coreboot. This will store code
+	  coverage information in CBMEM for extraction from user space.
+	  If unsure, say N.
+
 endmenu
 
 source src/mainboard/Kconfig
@@ -868,6 +877,15 @@
 	  the 0xaaaabbbb is the actual function and 0xccccdddd is EIP
 	  of calling function. Please note some printk releated functions
 	  are omitted from trace to have good looking console dumps.
+
+config DEBUG_COVERAGE
+	bool "Debug code coverage"
+	default n
+	depends on COVERAGE
+	help
+	  If enabled, the code coverage hooks in coreboot will output some
+	  information about the coverage data that is dumped.
+
 endmenu
 
 # These probably belong somewhere else, but they are needed somewhere.
diff --git a/src/arch/armv7/Makefile.inc b/src/arch/armv7/Makefile.inc
index e86e135..4cb97a6 100644
--- a/src/arch/armv7/Makefile.inc
+++ b/src/arch/armv7/Makefile.inc
@@ -121,7 +121,7 @@
 ifeq ($(CONFIG_COMPILER_LLVM_CLANG),y)
 	$(LD) -m -m armelf_linux_eabi -r -o $@ --wrap __divdi3 --wrap __udivdi3 --wrap __moddi3 --wrap __umoddi3 --wrap __uidiv --wrap __do_div64 --start-group $(ramstage-objs) $(LIBGCC_FILE_NAME) --end-group
 else
-	$(CC) -nostdlib -r -o $@ -Wl,--start-group $(ramstage-objs) $(LIBGCC_FILE_NAME) -Wl,--end-group
+	$(CC) $(CFLAGS) -nostdlib -r -o $@ -Wl,--start-group $(ramstage-objs) $(LIBGCC_FILE_NAME) -Wl,--end-group
 endif
 
 ################################################################################
diff --git a/src/arch/armv7/coreboot_ram.ld b/src/arch/armv7/coreboot_ram.ld
index 57ddd03..329bce4 100644
--- a/src/arch/armv7/coreboot_ram.ld
+++ b/src/arch/armv7/coreboot_ram.ld
@@ -38,6 +38,14 @@
 		_etext = .;
 	}
 
+	.ctors : {
+		. = ALIGN(0x100);
+		__CTOR_LIST__ = .;
+		*(.ctors);
+		LONG(0);
+		__CTOR_END__ = .;
+	}
+
 	.rodata : {
 		_rodata = .;
 		. = ALIGN(4);
diff --git a/src/arch/x86/Makefile.inc b/src/arch/x86/Makefile.inc
index e84700e..ea86f8f 100644
--- a/src/arch/x86/Makefile.inc
+++ b/src/arch/x86/Makefile.inc
@@ -166,7 +166,7 @@
 ifeq ($(CONFIG_COMPILER_LLVM_CLANG),y)
 	$(LD) -m elf_i386 -r -o $@ --wrap __divdi3 --wrap __udivdi3 --wrap __moddi3 --wrap __umoddi3 --start-group $(ramstage-objs) $(LIBGCC_FILE_NAME) --end-group
 else
-	$(CC) -nostdlib -r -o $@ -Wl,--wrap,__divdi3 -Wl,--wrap,__udivdi3 -Wl,--wrap,__moddi3 -Wl,--wrap,__umoddi3 -Wl,--start-group $(ramstage-objs) $(LIBGCC_FILE_NAME) -Wl,--end-group
+	$(CC) $(CFLAGS) -nostdlib -r -o $@ -Wl,--wrap,__divdi3 -Wl,--wrap,__udivdi3 -Wl,--wrap,__moddi3 -Wl,--wrap,__umoddi3 -Wl,--start-group $(ramstage-objs) $(LIBGCC_FILE_NAME) -Wl,--end-group
 endif
 
 ################################################################################
diff --git a/src/arch/x86/boot/acpi.c b/src/arch/x86/boot/acpi.c
index 1d7dbf8..730e53e 100644
--- a/src/arch/x86/boot/acpi.c
+++ b/src/arch/x86/boot/acpi.c
@@ -36,6 +36,7 @@
 #if CONFIG_COLLECT_TIMESTAMPS
 #include <timestamp.h>
 #endif
+#include <coverage.h>
 
 /* FIXME: Kconfig doesn't support overridable defaults :-( */
 #ifndef CONFIG_HPET_MIN_TICKS
@@ -642,6 +643,9 @@
 		/* Call mainboard resume handler first, if defined. */
 		if (mainboard_suspend_resume)
 			mainboard_suspend_resume();
+#if CONFIG_COVERAGE
+		coverage_exit();
+#endif
 		post_code(POST_OS_RESUME);
 		acpi_jump_to_wakeup(wake_vec);
 	}
diff --git a/src/arch/x86/coreboot_ram.ld b/src/arch/x86/coreboot_ram.ld
index a87a0e7..7ce0367 100644
--- a/src/arch/x86/coreboot_ram.ld
+++ b/src/arch/x86/coreboot_ram.ld
@@ -39,6 +39,14 @@
 		_etext = .;
 	}
 
+	.ctors : {
+		. = ALIGN(0x100);
+		__CTOR_LIST__ = .;
+		*(.ctors);
+		LONG(0);
+		__CTOR_END__ = .;
+	}
+
 	.rodata : {
 		_rodata = .;
 		. = ALIGN(4);
diff --git a/src/include/cbmem.h b/src/include/cbmem.h
index 21efe77..08e913a 100644
--- a/src/include/cbmem.h
+++ b/src/include/cbmem.h
@@ -55,6 +55,7 @@
 #define CBMEM_ID_MRCDATA	0x4d524344
 #define CBMEM_ID_CONSOLE	0x434f4e53
 #define CBMEM_ID_ELOG		0x454c4f47
+#define CBMEM_ID_COVERAGE	0x47434f56
 #define CBMEM_ID_NONE		0x00000000
 
 #ifndef __ASSEMBLER__
diff --git a/src/include/coverage.h b/src/include/coverage.h
new file mode 100644
index 0000000..e1c50c5
--- /dev/null
+++ b/src/include/coverage.h
@@ -0,0 +1,21 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2012 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
+ */
+
+void coverage_init(void);
+void coverage_exit(void);
diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc
index 6b3f0d8..6796448 100644
--- a/src/lib/Makefile.inc
+++ b/src/lib/Makefile.inc
@@ -70,6 +70,7 @@
 ramstage-$(CONFIG_BOOTSPLASH) += jpeg.c
 ramstage-$(CONFIG_TRACE) += trace.c
 ramstage-$(CONFIG_COLLECT_TIMESTAMPS) += timestamp.c
+ramstage-$(CONFIG_COVERAGE) += libgcov.c
 
 ramstage-$(CONFIG_CONSOLE_NE2K) += ne2k.c
 
diff --git a/src/lib/cbmem.c b/src/lib/cbmem.c
index 7378d8c..f270f5d 100644
--- a/src/lib/cbmem.c
+++ b/src/lib/cbmem.c
@@ -260,6 +260,8 @@
 		case CBMEM_ID_TIMESTAMP: printk(BIOS_DEBUG, "TIME STAMP "); break;
 		case CBMEM_ID_MRCDATA:	 printk(BIOS_DEBUG, "MRC DATA   "); break;
 		case CBMEM_ID_CONSOLE:   printk(BIOS_DEBUG, "CONSOLE    "); break;
+		case CBMEM_ID_ELOG:      printk(BIOS_DEBUG, "ELOG       "); break;
+		case CBMEM_ID_COVERAGE:  printk(BIOS_DEBUG, "COVERAGE   "); break;
 		default: printk(BIOS_DEBUG, "%08x ", cbmem_toc[i].id);
 		}
 		printk(BIOS_DEBUG, "%08llx ", cbmem_toc[i].base);
diff --git a/src/lib/gcov-glue.c b/src/lib/gcov-glue.c
new file mode 100644
index 0000000..7c069cb
--- /dev/null
+++ b/src/lib/gcov-glue.c
@@ -0,0 +1,153 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2012 Google, Inc.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
+ */
+
+#include <stdint.h>
+#include <cbmem.h>
+#include <coverage.h>
+
+typedef struct file {
+	uint32_t magic;
+	struct file *next;
+	char *filename;
+	char *data;
+	int offset;
+	int len;
+} FILE;
+
+#define SEEK_SET       0       /* Seek from beginning of file.  */
+
+#define DIR_SEPARATOR '/'
+#define IS_DIR_SEPARATOR(ch) ((ch) == DIR_SEPARATOR)
+#define HAS_DRIVE_SPEC(f) (0)
+
+#define COVERAGE_SIZE (32*1024)
+
+static FILE *current_file = NULL;
+static FILE *previous_file = NULL;
+
+static FILE *fopen(const char *path, const char *mode)
+{
+#if CONFIG_DEBUG_COVERAGE
+	printk(BIOS_DEBUG, "fopen %s with mode %s\n",
+		path, mode);
+#endif
+	if (!current_file) {
+		current_file = cbmem_add(CBMEM_ID_COVERAGE, 32*1024);
+	} else {
+		previous_file = current_file;
+		current_file = (FILE *)(ALIGN(((unsigned long)previous_file->data + previous_file->len), 16));
+	}
+
+	// TODO check if we're at the end of the CBMEM region (ENOMEM)
+	if (current_file) {
+		current_file->magic = 0x584d4153;
+		current_file->next = NULL;
+		if (previous_file)
+			previous_file->next = current_file;
+		current_file->filename = (char *)&current_file[1];
+		strcpy(current_file->filename, path);
+		current_file->data = (char *)ALIGN(((unsigned long)current_file->filename + strlen(path) + 1), 16);
+		current_file->offset = 0;
+		current_file->len = 0;
+	}
+
+	return current_file;
+}
+
+static int fclose(FILE *stream)
+{
+#if CONFIG_DEBUG_COVERAGE
+	printk(BIOS_DEBUG, "fclose %s\n", stream->filename);
+#endif
+	return 0;
+}
+
+static int fseek(FILE *stream, long offset, int whence)
+{
+	/* fseek should only be called with offset==0 and whence==SEEK_SET
+	 * to a freshly opened file. */
+	gcc_assert (offset == 0 && whence == SEEK_SET);
+#if CONFIG_DEBUG_COVERAGE
+	printk(BIOS_DEBUG, "fseek %s offset=%d whence=%d\n",
+		stream->filename, offset, whence);
+#endif
+	return 0;
+}
+
+static long ftell(FILE *stream)
+{
+	/* ftell should currently not be called */
+	gcc_assert(0);
+#if CONFIG_DEBUG_COVERAGE
+	printk(BIOS_DEBUG, "ftell %s\n", stream->filename);
+#endif
+	return 0;
+}
+
+static size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
+{
+#if CONFIG_DEBUG_COVERAGE
+	printk(BIOS_DEBUG, "fread: ptr=%p size=%zd nmemb=%zd FILE*=%p\n",
+		ptr, size, nmemb, stream);
+#endif
+	return 0;
+}
+
+static size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
+{
+#if CONFIG_DEBUG_COVERAGE
+	printk(BIOS_DEBUG, "fwrite: %zd * 0x%zd bytes to file %s\n",
+		nmemb, size, stream->filename);
+#endif
+	// TODO check if file is last opened file and fail otherwise.
+
+	memcpy(stream->data + stream->offset, ptr, size * nmemb);
+	stream->len += (nmemb * size) - (stream->len - stream->offset);
+	stream->offset += nmemb * size;
+	return nmemb;
+}
+
+static void setbuf(FILE *stream, char *buf)
+{
+	gcc_assert(buf == 0);
+}
+
+void coverage_init(void)
+{
+	extern long __CTOR_LIST__;
+	typedef void (*func_ptr)(void) ;
+	func_ptr *ctor = (func_ptr*) &__CTOR_LIST__;
+	if (ctor == NULL)
+		return;
+
+	for ( ; *ctor != (func_ptr) 0; ctor++) {
+		(*ctor)();
+	}
+}
+
+void __gcov_flush(void);
+void coverage_exit(void)
+{
+#if CONFIG_DEBUG_COVERAGE
+	printk(BIOS_DEBUG, "Syncing coverage data.\n");
+#endif
+	__gcov_flush();
+}
+
+
diff --git a/src/lib/gcov-io.c b/src/lib/gcov-io.c
new file mode 100644
index 0000000..37c1c3e
--- /dev/null
+++ b/src/lib/gcov-io.c
@@ -0,0 +1,552 @@
+/* File format for coverage information
+   Copyright (C) 1996, 1997, 1998, 2000, 2002, 2003, 2004, 2005, 2007,
+   2008  Free Software Foundation, Inc.
+   Contributed by Bob Manson <manson@cygnus.com>.
+   Completely remangled by Nathan Sidwell <nathan@codesourcery.com>.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/* Routines declared in gcov-io.h.  This file should be #included by
+   another source file, after having #included gcov-io.h.  */
+
+#if !IN_GCOV
+static void gcov_write_block (unsigned);
+static gcov_unsigned_t *gcov_write_words (unsigned);
+#endif
+static const gcov_unsigned_t *gcov_read_words (unsigned);
+#if !IN_LIBGCOV
+static void gcov_allocate (unsigned);
+#endif
+
+static inline gcov_unsigned_t from_file (gcov_unsigned_t value)
+{
+#if !IN_LIBGCOV
+  if (gcov_var.endian)
+    {
+      value = (value >> 16) | (value << 16);
+      value = ((value & 0xff00ff) << 8) | ((value >> 8) & 0xff00ff);
+    }
+#endif
+  return value;
+}
+
+/* Open a gcov file. NAME is the name of the file to open and MODE
+   indicates whether a new file should be created, or an existing file
+   opened. If MODE is >= 0 an existing file will be opened, if
+   possible, and if MODE is <= 0, a new file will be created. Use
+   MODE=0 to attempt to reopen an existing file and then fall back on
+   creating a new one.  If MODE < 0, the file will be opened in
+   read-only mode.  Otherwise it will be opened for modification.
+   Return zero on failure, >0 on opening an existing file and <0 on
+   creating a new one.  */
+
+GCOV_LINKAGE int
+#if IN_LIBGCOV
+gcov_open (const char *name)
+#else
+gcov_open (const char *name, int mode)
+#endif
+{
+#if IN_LIBGCOV
+  const int mode = 0;
+#endif
+#if GCOV_LOCKED
+  struct flock s_flock;
+  int fd;
+
+  s_flock.l_whence = SEEK_SET;
+  s_flock.l_start = 0;
+  s_flock.l_len = 0; /* Until EOF.  */
+  s_flock.l_pid = getpid ();
+#endif
+
+  gcc_assert (!gcov_var.file);
+  gcov_var.start = 0;
+  gcov_var.offset = gcov_var.length = 0;
+  gcov_var.overread = -1u;
+  gcov_var.error = 0;
+#if !IN_LIBGCOV
+  gcov_var.endian = 0;
+#endif
+#if GCOV_LOCKED
+  if (mode > 0)
+    {
+      /* Read-only mode - acquire a read-lock.  */
+      s_flock.l_type = F_RDLCK;
+      fd = open (name, O_RDONLY);
+    }
+  else
+    {
+      /* Write mode - acquire a write-lock.  */
+      s_flock.l_type = F_WRLCK;
+      fd = open (name, O_RDWR | O_CREAT, 0666);
+    }
+  if (fd < 0)
+    return 0;
+
+  while (fcntl (fd, F_SETLKW, &s_flock) && errno == EINTR)
+    continue;
+
+  gcov_var.file = fdopen (fd, (mode > 0) ? "rb" : "r+b");
+
+  if (!gcov_var.file)
+    {
+      close (fd);
+      return 0;
+    }
+
+  if (mode > 0)
+    gcov_var.mode = 1;
+  else if (mode == 0)
+    {
+      struct stat st;
+
+      if (fstat (fd, &st) < 0)
+	{
+	  fclose (gcov_var.file);
+	  gcov_var.file = 0;
+	  return 0;
+	}
+      if (st.st_size != 0)
+	gcov_var.mode = 1;
+      else
+	gcov_var.mode = mode * 2 + 1;
+    }
+  else
+    gcov_var.mode = mode * 2 + 1;
+#else
+  if (mode >= 0)
+    gcov_var.file = fopen (name, (mode > 0) ? "rb" : "r+b");
+
+  if (gcov_var.file)
+    gcov_var.mode = 1;
+  else if (mode <= 0)
+    {
+      gcov_var.file = fopen (name, "w+b");
+      if (gcov_var.file)
+	gcov_var.mode = mode * 2 + 1;
+    }
+  if (!gcov_var.file)
+    return 0;
+#endif
+
+  setbuf (gcov_var.file, (char *)0);
+
+  return 1;
+}
+
+/* Close the current gcov file. Flushes data to disk. Returns nonzero
+   on failure or error flag set.  */
+
+GCOV_LINKAGE int
+gcov_close (void)
+{
+  if (gcov_var.file)
+    {
+#if !IN_GCOV
+      if (gcov_var.offset && gcov_var.mode < 0)
+	gcov_write_block (gcov_var.offset);
+#endif
+      fclose (gcov_var.file);
+      gcov_var.file = 0;
+      gcov_var.length = 0;
+    }
+#if !IN_LIBGCOV
+  free (gcov_var.buffer);
+  gcov_var.alloc = 0;
+  gcov_var.buffer = 0;
+#endif
+  gcov_var.mode = 0;
+  return gcov_var.error;
+}
+
+#if !IN_LIBGCOV
+/* Check if MAGIC is EXPECTED. Use it to determine endianness of the
+   file. Returns +1 for same endian, -1 for other endian and zero for
+   not EXPECTED.  */
+
+GCOV_LINKAGE int
+gcov_magic (gcov_unsigned_t magic, gcov_unsigned_t expected)
+{
+  if (magic == expected)
+    return 1;
+  magic = (magic >> 16) | (magic << 16);
+  magic = ((magic & 0xff00ff) << 8) | ((magic >> 8) & 0xff00ff);
+  if (magic == expected)
+    {
+      gcov_var.endian = 1;
+      return -1;
+    }
+  return 0;
+}
+#endif
+
+#if !IN_LIBGCOV
+static void
+gcov_allocate (unsigned length)
+{
+  size_t new_size = gcov_var.alloc;
+
+  if (!new_size)
+    new_size = GCOV_BLOCK_SIZE;
+  new_size += length;
+  new_size *= 2;
+
+  gcov_var.alloc = new_size;
+  gcov_var.buffer = XRESIZEVAR (gcov_unsigned_t, gcov_var.buffer, new_size << 2);
+}
+#endif
+
+#if !IN_GCOV
+/* Write out the current block, if needs be.  */
+
+static void
+gcov_write_block (unsigned size)
+{
+  if (fwrite (gcov_var.buffer, size << 2, 1, gcov_var.file) != 1)
+    gcov_var.error = 1;
+  gcov_var.start += size;
+  gcov_var.offset -= size;
+}
+
+/* Allocate space to write BYTES bytes to the gcov file. Return a
+   pointer to those bytes, or NULL on failure.  */
+
+static gcov_unsigned_t *
+gcov_write_words (unsigned words)
+{
+  gcov_unsigned_t *result;
+
+  gcc_assert (gcov_var.mode < 0);
+#if IN_LIBGCOV
+  if (gcov_var.offset >= GCOV_BLOCK_SIZE)
+    {
+      gcov_write_block (GCOV_BLOCK_SIZE);
+      if (gcov_var.offset)
+	{
+	  gcc_assert (gcov_var.offset == 1);
+	  memcpy (gcov_var.buffer, gcov_var.buffer + GCOV_BLOCK_SIZE, 4);
+	}
+    }
+#else
+  if (gcov_var.offset + words > gcov_var.alloc)
+    gcov_allocate (gcov_var.offset + words);
+#endif
+  result = &gcov_var.buffer[gcov_var.offset];
+  gcov_var.offset += words;
+
+  return result;
+}
+
+/* Write unsigned VALUE to coverage file.  Sets error flag
+   appropriately.  */
+
+GCOV_LINKAGE void
+gcov_write_unsigned (gcov_unsigned_t value)
+{
+  gcov_unsigned_t *buffer = gcov_write_words (1);
+
+  buffer[0] = value;
+}
+
+/* Write counter VALUE to coverage file.  Sets error flag
+   appropriately.  */
+
+#if IN_LIBGCOV
+GCOV_LINKAGE void
+gcov_write_counter (gcov_type value)
+{
+  gcov_unsigned_t *buffer = gcov_write_words (2);
+
+  buffer[0] = (gcov_unsigned_t) value;
+  if (sizeof (value) > sizeof (gcov_unsigned_t))
+    buffer[1] = (gcov_unsigned_t) (value >> 32);
+  else
+    buffer[1] = 0;
+}
+#endif /* IN_LIBGCOV */
+
+#if !IN_LIBGCOV
+/* Write STRING to coverage file.  Sets error flag on file
+   error, overflow flag on overflow */
+
+GCOV_LINKAGE void
+gcov_write_string (const char *string)
+{
+  unsigned length = 0;
+  unsigned alloc = 0;
+  gcov_unsigned_t *buffer;
+
+  if (string)
+    {
+      length = strlen (string);
+      alloc = (length + 4) >> 2;
+    }
+
+  buffer = gcov_write_words (1 + alloc);
+
+  buffer[0] = alloc;
+  buffer[alloc] = 0;
+  memcpy (&buffer[1], string, length);
+}
+#endif
+
+#if !IN_LIBGCOV
+/* Write a tag TAG and reserve space for the record length. Return a
+   value to be used for gcov_write_length.  */
+
+GCOV_LINKAGE gcov_position_t
+gcov_write_tag (gcov_unsigned_t tag)
+{
+  gcov_position_t result = gcov_var.start + gcov_var.offset;
+  gcov_unsigned_t *buffer = gcov_write_words (2);
+
+  buffer[0] = tag;
+  buffer[1] = 0;
+
+  return result;
+}
+
+/* Write a record length using POSITION, which was returned by
+   gcov_write_tag.  The current file position is the end of the
+   record, and is restored before returning.  Returns nonzero on
+   overflow.  */
+
+GCOV_LINKAGE void
+gcov_write_length (gcov_position_t position)
+{
+  unsigned offset;
+  gcov_unsigned_t length;
+  gcov_unsigned_t *buffer;
+
+  gcc_assert (gcov_var.mode < 0);
+  gcc_assert (position + 2 <= gcov_var.start + gcov_var.offset);
+  gcc_assert (position >= gcov_var.start);
+  offset = position - gcov_var.start;
+  length = gcov_var.offset - offset - 2;
+  buffer = (gcov_unsigned_t *) &gcov_var.buffer[offset];
+  buffer[1] = length;
+  if (gcov_var.offset >= GCOV_BLOCK_SIZE)
+    gcov_write_block (gcov_var.offset);
+}
+
+#else /* IN_LIBGCOV */
+
+/* Write a tag TAG and length LENGTH.  */
+
+GCOV_LINKAGE void
+gcov_write_tag_length (gcov_unsigned_t tag, gcov_unsigned_t length)
+{
+  gcov_unsigned_t *buffer = gcov_write_words (2);
+
+  buffer[0] = tag;
+  buffer[1] = length;
+}
+
+/* Write a summary structure to the gcov file.  Return nonzero on
+   overflow.  */
+
+GCOV_LINKAGE void
+gcov_write_summary (gcov_unsigned_t tag, const struct gcov_summary *summary)
+{
+  unsigned ix;
+  const struct gcov_ctr_summary *csum;
+
+  gcov_write_tag_length (tag, GCOV_TAG_SUMMARY_LENGTH);
+  gcov_write_unsigned (summary->checksum);
+  for (csum = summary->ctrs, ix = GCOV_COUNTERS_SUMMABLE; ix--; csum++)
+    {
+      gcov_write_unsigned (csum->num);
+      gcov_write_unsigned (csum->runs);
+      gcov_write_counter (csum->sum_all);
+      gcov_write_counter (csum->run_max);
+      gcov_write_counter (csum->sum_max);
+    }
+}
+#endif /* IN_LIBGCOV */
+
+#endif /*!IN_GCOV */
+
+/* Return a pointer to read BYTES bytes from the gcov file. Returns
+   NULL on failure (read past EOF).  */
+
+static const gcov_unsigned_t *
+gcov_read_words (unsigned words)
+{
+  const gcov_unsigned_t *result;
+  unsigned excess = gcov_var.length - gcov_var.offset;
+
+  gcc_assert (gcov_var.mode > 0);
+  if (excess < words)
+    {
+      gcov_var.start += gcov_var.offset;
+#if IN_LIBGCOV
+      if (excess)
+	{
+	  gcc_assert (excess == 1);
+	  memcpy (gcov_var.buffer, gcov_var.buffer + gcov_var.offset, 4);
+	}
+#else
+      memmove (gcov_var.buffer, gcov_var.buffer + gcov_var.offset, excess * 4);
+#endif
+      gcov_var.offset = 0;
+      gcov_var.length = excess;
+#if IN_LIBGCOV
+      gcc_assert (!gcov_var.length || gcov_var.length == 1);
+      excess = GCOV_BLOCK_SIZE;
+#else
+      if (gcov_var.length + words > gcov_var.alloc)
+	gcov_allocate (gcov_var.length + words);
+      excess = gcov_var.alloc - gcov_var.length;
+#endif
+      excess = fread (gcov_var.buffer + gcov_var.length,
+		      1, excess << 2, gcov_var.file) >> 2;
+      gcov_var.length += excess;
+      if (gcov_var.length < words)
+	{
+	  gcov_var.overread += words - gcov_var.length;
+	  gcov_var.length = 0;
+	  return 0;
+	}
+    }
+  result = &gcov_var.buffer[gcov_var.offset];
+  gcov_var.offset += words;
+  return result;
+}
+
+/* Read unsigned value from a coverage file. Sets error flag on file
+   error, overflow flag on overflow */
+
+GCOV_LINKAGE gcov_unsigned_t
+gcov_read_unsigned (void)
+{
+  gcov_unsigned_t value;
+  const gcov_unsigned_t *buffer = gcov_read_words (1);
+
+  if (!buffer)
+    return 0;
+  value = from_file (buffer[0]);
+  return value;
+}
+
+/* Read counter value from a coverage file. Sets error flag on file
+   error, overflow flag on overflow */
+
+GCOV_LINKAGE gcov_type
+gcov_read_counter (void)
+{
+  gcov_type value;
+  const gcov_unsigned_t *buffer = gcov_read_words (2);
+
+  if (!buffer)
+    return 0;
+  value = from_file (buffer[0]);
+  if (sizeof (value) > sizeof (gcov_unsigned_t))
+    value |= ((gcov_type) from_file (buffer[1])) << 32;
+  else if (buffer[1])
+    gcov_var.error = -1;
+
+  return value;
+}
+
+/* Read string from coverage file. Returns a pointer to a static
+   buffer, or NULL on empty string. You must copy the string before
+   calling another gcov function.  */
+
+#if !IN_LIBGCOV
+GCOV_LINKAGE const char *
+gcov_read_string (void)
+{
+  unsigned length = gcov_read_unsigned ();
+
+  if (!length)
+    return 0;
+
+  return (const char *) gcov_read_words (length);
+}
+#endif
+
+GCOV_LINKAGE void
+gcov_read_summary (struct gcov_summary *summary)
+{
+  unsigned ix;
+  struct gcov_ctr_summary *csum;
+
+  summary->checksum = gcov_read_unsigned ();
+  for (csum = summary->ctrs, ix = GCOV_COUNTERS_SUMMABLE; ix--; csum++)
+    {
+      csum->num = gcov_read_unsigned ();
+      csum->runs = gcov_read_unsigned ();
+      csum->sum_all = gcov_read_counter ();
+      csum->run_max = gcov_read_counter ();
+      csum->sum_max = gcov_read_counter ();
+    }
+}
+
+#if !IN_LIBGCOV
+/* Reset to a known position.  BASE should have been obtained from
+   gcov_position, LENGTH should be a record length.  */
+
+GCOV_LINKAGE void
+gcov_sync (gcov_position_t base, gcov_unsigned_t length)
+{
+  gcc_assert (gcov_var.mode > 0);
+  base += length;
+  if (base - gcov_var.start <= gcov_var.length)
+    gcov_var.offset = base - gcov_var.start;
+  else
+    {
+      gcov_var.offset = gcov_var.length = 0;
+      fseek (gcov_var.file, base << 2, SEEK_SET);
+      gcov_var.start = ftell (gcov_var.file) >> 2;
+    }
+}
+#endif
+
+#if IN_LIBGCOV
+/* Move to a given position in a gcov file.  */
+
+GCOV_LINKAGE void
+gcov_seek (gcov_position_t base)
+{
+  gcc_assert (gcov_var.mode < 0);
+  if (gcov_var.offset)
+    gcov_write_block (gcov_var.offset);
+  fseek (gcov_var.file, base << 2, SEEK_SET);
+  gcov_var.start = ftell (gcov_var.file) >> 2;
+}
+#endif
+
+#if IN_GCOV > 0
+/* Return the modification time of the current gcov file.  */
+
+GCOV_LINKAGE time_t
+gcov_time (void)
+{
+  struct stat status;
+
+  if (fstat (fileno (gcov_var.file), &status))
+    return 0;
+  else
+    return status.st_mtime;
+}
+#endif /* IN_GCOV */
diff --git a/src/lib/gcov-io.h b/src/lib/gcov-io.h
new file mode 100644
index 0000000..4502bd6
--- /dev/null
+++ b/src/lib/gcov-io.h
@@ -0,0 +1,639 @@
+/* File format for coverage information
+   Copyright (C) 1996, 1997, 1998, 2000, 2002,
+   2003, 2004, 2005, 2008, 2009 Free Software Foundation, Inc.
+   Contributed by Bob Manson <manson@cygnus.com>.
+   Completely remangled by Nathan Sidwell <nathan@codesourcery.com>.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+
+/* Coverage information is held in two files.  A notes file, which is
+   generated by the compiler, and a data file, which is generated by
+   the program under test.  Both files use a similar structure.  We do
+   not attempt to make these files backwards compatible with previous
+   versions, as you only need coverage information when developing a
+   program.  We do hold version information, so that mismatches can be
+   detected, and we use a format that allows tools to skip information
+   they do not understand or are not interested in.
+
+   Numbers are recorded in the 32 bit unsigned binary form of the
+   endianness of the machine generating the file. 64 bit numbers are
+   stored as two 32 bit numbers, the low part first.  Strings are
+   padded with 1 to 4 NUL bytes, to bring the length up to a multiple
+   of 4. The number of 4 bytes is stored, followed by the padded
+   string. Zero length and NULL strings are simply stored as a length
+   of zero (they have no trailing NUL or padding).
+
+	int32:  byte3 byte2 byte1 byte0 | byte0 byte1 byte2 byte3
+	int64:  int32:low int32:high
+	string: int32:0 | int32:length char* char:0 padding
+	padding: | char:0 | char:0 char:0 | char:0 char:0 char:0
+	item: int32 | int64 | string
+
+   The basic format of the files is
+
+	file : int32:magic int32:version int32:stamp record*
+
+   The magic ident is different for the notes and the data files.  The
+   magic ident is used to determine the endianness of the file, when
+   reading.  The version is the same for both files and is derived
+   from gcc's version number. The stamp value is used to synchronize
+   note and data files and to synchronize merging within a data
+   file. It need not be an absolute time stamp, merely a ticker that
+   increments fast enough and cycles slow enough to distinguish
+   different compile/run/compile cycles.
+
+   Although the ident and version are formally 32 bit numbers, they
+   are derived from 4 character ASCII strings.  The version number
+   consists of the single character major version number, a two
+   character minor version number (leading zero for versions less than
+   10), and a single character indicating the status of the release.
+   That will be 'e' experimental, 'p' prerelease and 'r' for release.
+   Because, by good fortune, these are in alphabetical order, string
+   collating can be used to compare version strings.  Be aware that
+   the 'e' designation will (naturally) be unstable and might be
+   incompatible with itself.  For gcc 3.4 experimental, it would be
+   '304e' (0x33303465).  When the major version reaches 10, the
+   letters A-Z will be used.  Assuming minor increments releases every
+   6 months, we have to make a major increment every 50 years.
+   Assuming major increments releases every 5 years, we're ok for the
+   next 155 years -- good enough for me.
+
+   A record has a tag, length and variable amount of data.
+
+	record: header data
+	header: int32:tag int32:length
+	data: item*
+
+   Records are not nested, but there is a record hierarchy.  Tag
+   numbers reflect this hierarchy.  Tags are unique across note and
+   data files.  Some record types have a varying amount of data.  The
+   LENGTH is the number of 4bytes that follow and is usually used to
+   determine how much data.  The tag value is split into 4 8-bit
+   fields, one for each of four possible levels.  The most significant
+   is allocated first.  Unused levels are zero.  Active levels are
+   odd-valued, so that the LSB of the level is one.  A sub-level
+   incorporates the values of its superlevels.  This formatting allows
+   you to determine the tag hierarchy, without understanding the tags
+   themselves, and is similar to the standard section numbering used
+   in technical documents.  Level values [1..3f] are used for common
+   tags, values [41..9f] for the notes file and [a1..ff] for the data
+   file.
+
+   The basic block graph file contains the following records
+	note: unit function-graph*
+	unit: header int32:checksum string:source
+	function-graph: announce_function basic_blocks {arcs | lines}*
+	announce_function: header int32:ident
+		int32:lineno_checksum int32:cfg_checksum
+		string:name string:source int32:lineno
+	basic_block: header int32:flags*
+	arcs: header int32:block_no arc*
+	arc:  int32:dest_block int32:flags
+        lines: header int32:block_no line*
+               int32:0 string:NULL
+	line:  int32:line_no | int32:0 string:filename
+
+   The BASIC_BLOCK record holds per-bb flags.  The number of blocks
+   can be inferred from its data length.  There is one ARCS record per
+   basic block.  The number of arcs from a bb is implicit from the
+   data length.  It enumerates the destination bb and per-arc flags.
+   There is one LINES record per basic block, it enumerates the source
+   lines which belong to that basic block.  Source file names are
+   introduced by a line number of 0, following lines are from the new
+   source file.  The initial source file for the function is NULL, but
+   the current source file should be remembered from one LINES record
+   to the next.  The end of a block is indicated by an empty filename
+   - this does not reset the current source file.  Note there is no
+   ordering of the ARCS and LINES records: they may be in any order,
+   interleaved in any manner.  The current filename follows the order
+   the LINES records are stored in the file, *not* the ordering of the
+   blocks they are for.
+
+   The data file contains the following records.
+        data: {unit summary:object summary:program* function-data*}*
+	unit: header int32:checksum
+        function-data:	announce_function present counts
+	announce_function: header int32:ident
+		int32:lineno_checksum int32:cfg_checksum
+	present: header int32:present
+	counts: header int64:count*
+	summary: int32:checksum {count-summary}GCOV_COUNTERS_SUMMABLE
+	count-summary:	int32:num int32:runs int64:sum
+			int64:max int64:sum_max
+
+   The ANNOUNCE_FUNCTION record is the same as that in the note file,
+   but without the source location.  The COUNTS gives the
+   counter values for instrumented features.  The about the whole
+   program.  The checksum is used for whole program summaries, and
+   disambiguates different programs which include the same
+   instrumented object file.  There may be several program summaries,
+   each with a unique checksum.  The object summary's checksum is
+   zero.  Note that the data file might contain information from
+   several runs concatenated, or the data might be merged.
+
+   This file is included by both the compiler, gcov tools and the
+   runtime support library libgcov. IN_LIBGCOV and IN_GCOV are used to
+   distinguish which case is which.  If IN_LIBGCOV is nonzero,
+   libgcov is being built. If IN_GCOV is nonzero, the gcov tools are
+   being built. Otherwise the compiler is being built. IN_GCOV may be
+   positive or negative. If positive, we are compiling a tool that
+   requires additional functions (see the code for knowledge of what
+   those functions are).  */
+
+#ifndef GCC_GCOV_IO_H
+#define GCC_GCOV_IO_H
+
+#ifdef __COREBOOT__
+#define GCOV_LINKAGE /* nothing */
+/* We need the definitions for
+    BITS_PER_UNIT and
+    LONG_LONG_TYPE_SIZE
+   They are defined in gcc/defaults.h and gcc/config/<arch_depend_files>
+   (like, gcc/config/i386/i386.h). And it can be overridden by setting
+   in build scripts. Here I hardcoded the value for x86. */
+#define BITS_PER_UNIT 8
+#define LONG_LONG_TYPE_SIZE 64
+
+/* There are many gcc_assertions. Set the vaule to 1 if we want a warning
+   message if the assertion fails.  */
+#ifndef ENABLE_ASSERT_CHECKING
+#define ENABLE_ASSERT_CHECKING 1
+#endif
+#endif /* __COREBOOT__ */
+
+#if IN_LIBGCOV
+/* About the target */
+
+#if BITS_PER_UNIT == 8
+typedef unsigned gcov_unsigned_t __attribute__ ((mode (SI)));
+typedef unsigned gcov_position_t __attribute__ ((mode (SI)));
+#if LONG_LONG_TYPE_SIZE > 32
+typedef signed gcov_type __attribute__ ((mode (DI)));
+#else
+typedef signed gcov_type __attribute__ ((mode (SI)));
+#endif
+#else
+#if BITS_PER_UNIT == 16
+typedef unsigned gcov_unsigned_t __attribute__ ((mode (HI)));
+typedef unsigned gcov_position_t __attribute__ ((mode (HI)));
+#if LONG_LONG_TYPE_SIZE > 32
+typedef signed gcov_type __attribute__ ((mode (SI)));
+#else
+typedef signed gcov_type __attribute__ ((mode (HI)));
+#endif
+#else
+typedef unsigned gcov_unsigned_t __attribute__ ((mode (QI)));
+typedef unsigned gcov_position_t __attribute__ ((mode (QI)));
+#if LONG_LONG_TYPE_SIZE > 32
+typedef signed gcov_type __attribute__ ((mode (HI)));
+#else
+typedef signed gcov_type __attribute__ ((mode (QI)));
+#endif
+#endif
+#endif
+
+
+#if defined (TARGET_POSIX_IO)
+#define GCOV_LOCKED 1
+#else
+#define GCOV_LOCKED 0
+#endif
+
+#else /* !IN_LIBGCOV */
+/* About the host */
+
+typedef unsigned gcov_unsigned_t;
+typedef unsigned gcov_position_t;
+/* gcov_type is typedef'd elsewhere for the compiler */
+#if IN_GCOV
+#define GCOV_LINKAGE static
+typedef HOST_WIDEST_INT gcov_type;
+#if IN_GCOV > 0
+#include <sys/types.h>
+#endif
+#else /*!IN_GCOV */
+#define GCOV_TYPE_SIZE (LONG_LONG_TYPE_SIZE > 32 ? 64 : 32)
+#endif
+
+#if defined (HOST_HAS_F_SETLKW)
+#define GCOV_LOCKED 1
+#else
+#define GCOV_LOCKED 0
+#endif
+
+#endif /* !IN_LIBGCOV */
+
+/* In gcov we want function linkage to be static.  In the compiler we want
+   it extern, so that they can be accessed from elsewhere.  In libgcov we
+   need these functions to be extern, so prefix them with __gcov.  In
+   libgcov they must also be hidden so that the instance in the executable
+   is not also used in a DSO.  */
+#if IN_LIBGCOV
+
+#ifndef __COREBOOT__
+#include "tconfig.h"
+#endif /* __COREBOOT__ */
+
+#define gcov_var __gcov_var
+#define gcov_open __gcov_open
+#define gcov_close __gcov_close
+#define gcov_write_tag_length __gcov_write_tag_length
+#define gcov_position __gcov_position
+#define gcov_seek __gcov_seek
+#define gcov_rewrite __gcov_rewrite
+#define gcov_is_error __gcov_is_error
+#define gcov_write_unsigned __gcov_write_unsigned
+#define gcov_write_counter __gcov_write_counter
+#define gcov_write_summary __gcov_write_summary
+#define gcov_read_unsigned __gcov_read_unsigned
+#define gcov_read_counter __gcov_read_counter
+#define gcov_read_summary __gcov_read_summary
+
+/* Poison these, so they don't accidentally slip in.  */
+#pragma GCC poison gcov_write_string gcov_write_tag gcov_write_length
+#pragma GCC poison gcov_read_string gcov_sync gcov_time gcov_magic
+
+#ifdef HAVE_GAS_HIDDEN
+#define ATTRIBUTE_HIDDEN  __attribute__ ((__visibility__ ("hidden")))
+#else
+#define ATTRIBUTE_HIDDEN
+#endif
+
+#else
+
+#define ATTRIBUTE_HIDDEN
+
+#endif
+
+#ifndef GCOV_LINKAGE
+#define GCOV_LINKAGE extern
+#endif
+
+/* File suffixes.  */
+#define GCOV_DATA_SUFFIX ".gcda"
+#define GCOV_NOTE_SUFFIX ".gcno"
+
+/* File magic. Must not be palindromes.  */
+#define GCOV_DATA_MAGIC ((gcov_unsigned_t)0x67636461) /* "gcda" */
+#define GCOV_NOTE_MAGIC ((gcov_unsigned_t)0x67636e6f) /* "gcno" */
+
+/* gcov-iov.h is automatically generated by the makefile from
+   version.c, it looks like
+	#define GCOV_VERSION ((gcov_unsigned_t)0x89abcdef)
+*/
+#include "gcov-iov.h"
+
+/* Convert a magic or version number to a 4 character string.  */
+#define GCOV_UNSIGNED2STRING(ARRAY,VALUE)	\
+  ((ARRAY)[0] = (char)((VALUE) >> 24),		\
+   (ARRAY)[1] = (char)((VALUE) >> 16),		\
+   (ARRAY)[2] = (char)((VALUE) >> 8),		\
+   (ARRAY)[3] = (char)((VALUE) >> 0))
+
+/* The record tags.  Values [1..3f] are for tags which may be in either
+   file.  Values [41..9f] for those in the note file and [a1..ff] for
+   the data file.  The tag value zero is used as an explicit end of
+   file marker -- it is not required to be present.  */
+
+#define GCOV_TAG_FUNCTION	 ((gcov_unsigned_t)0x01000000)
+#define GCOV_TAG_FUNCTION_LENGTH (3)
+#define GCOV_TAG_BLOCKS		 ((gcov_unsigned_t)0x01410000)
+#define GCOV_TAG_BLOCKS_LENGTH(NUM) (NUM)
+#define GCOV_TAG_BLOCKS_NUM(LENGTH) (LENGTH)
+#define GCOV_TAG_ARCS		 ((gcov_unsigned_t)0x01430000)
+#define GCOV_TAG_ARCS_LENGTH(NUM)  (1 + (NUM) * 2)
+#define GCOV_TAG_ARCS_NUM(LENGTH)  (((LENGTH) - 1) / 2)
+#define GCOV_TAG_LINES		 ((gcov_unsigned_t)0x01450000)
+#define GCOV_TAG_COUNTER_BASE 	 ((gcov_unsigned_t)0x01a10000)
+#define GCOV_TAG_COUNTER_LENGTH(NUM) ((NUM) * 2)
+#define GCOV_TAG_COUNTER_NUM(LENGTH) ((LENGTH) / 2)
+#define GCOV_TAG_OBJECT_SUMMARY  ((gcov_unsigned_t)0xa1000000) /* Obsolete */
+#define GCOV_TAG_PROGRAM_SUMMARY ((gcov_unsigned_t)0xa3000000)
+#define GCOV_TAG_SUMMARY_LENGTH  \
+	(1 + GCOV_COUNTERS_SUMMABLE * (2 + 3 * 2))
+
+/* Counters that are collected.  */
+#define GCOV_COUNTER_ARCS 	0  /* Arc transitions.  */
+#define GCOV_COUNTERS_SUMMABLE	1  /* Counters which can be
+				      summaried.  */
+#define GCOV_FIRST_VALUE_COUNTER 1 /* The first of counters used for value
+				      profiling.  They must form a consecutive
+				      interval and their order must match
+				      the order of HIST_TYPEs in
+				      value-prof.h.  */
+#define GCOV_COUNTER_V_INTERVAL	1  /* Histogram of value inside an interval.  */
+#define GCOV_COUNTER_V_POW2	2  /* Histogram of exact power2 logarithm
+				      of a value.  */
+#define GCOV_COUNTER_V_SINGLE	3  /* The most common value of expression.  */
+#define GCOV_COUNTER_V_DELTA	4  /* The most common difference between
+				      consecutive values of expression.  */
+
+#define GCOV_COUNTER_V_INDIR	5  /* The most common indirect address */
+#define GCOV_COUNTER_AVERAGE	6  /* Compute average value passed to the
+				      counter.  */
+#define GCOV_COUNTER_IOR	7  /* IOR of the all values passed to
+				      counter.  */
+#define GCOV_LAST_VALUE_COUNTER 7  /* The last of counters used for value
+				      profiling.  */
+#define GCOV_COUNTERS		8
+
+/* Number of counters used for value profiling.  */
+#define GCOV_N_VALUE_COUNTERS \
+  (GCOV_LAST_VALUE_COUNTER - GCOV_FIRST_VALUE_COUNTER + 1)
+
+  /* A list of human readable names of the counters */
+#define GCOV_COUNTER_NAMES	{"arcs", "interval", "pow2", "single", \
+				 "delta", "indirect_call", "average", "ior"}
+
+  /* Names of merge functions for counters.  */
+#define GCOV_MERGE_FUNCTIONS	{"__gcov_merge_add",	\
+				 "__gcov_merge_add",	\
+				 "__gcov_merge_add",	\
+				 "__gcov_merge_single",	\
+				 "__gcov_merge_delta",  \
+				 "__gcov_merge_single", \
+				 "__gcov_merge_add",	\
+				 "__gcov_merge_ior"}
+
+/* Convert a counter index to a tag.  */
+#define GCOV_TAG_FOR_COUNTER(COUNT)				\
+	(GCOV_TAG_COUNTER_BASE + ((gcov_unsigned_t)(COUNT) << 17))
+/* Convert a tag to a counter.  */
+#define GCOV_COUNTER_FOR_TAG(TAG)					\
+	((unsigned)(((TAG) - GCOV_TAG_COUNTER_BASE) >> 17))
+/* Check whether a tag is a counter tag.  */
+#define GCOV_TAG_IS_COUNTER(TAG)				\
+	(!((TAG) & 0xFFFF) && GCOV_COUNTER_FOR_TAG (TAG) < GCOV_COUNTERS)
+
+/* The tag level mask has 1's in the position of the inner levels, &
+   the lsb of the current level, and zero on the current and outer
+   levels.  */
+#define GCOV_TAG_MASK(TAG) (((TAG) - 1) ^ (TAG))
+
+/* Return nonzero if SUB is an immediate subtag of TAG.  */
+#define GCOV_TAG_IS_SUBTAG(TAG,SUB)				\
+	(GCOV_TAG_MASK (TAG) >> 8 == GCOV_TAG_MASK (SUB) 	\
+	 && !(((SUB) ^ (TAG)) & ~GCOV_TAG_MASK(TAG)))
+
+/* Return nonzero if SUB is at a sublevel to TAG.  */
+#define GCOV_TAG_IS_SUBLEVEL(TAG,SUB)				\
+	(GCOV_TAG_MASK (TAG) > GCOV_TAG_MASK (SUB))
+
+/* Basic block flags.  */
+#define GCOV_BLOCK_UNEXPECTED	(1 << 1)
+
+/* Arc flags.  */
+#define GCOV_ARC_ON_TREE 	(1 << 0)
+#define GCOV_ARC_FAKE		(1 << 1)
+#define GCOV_ARC_FALLTHROUGH	(1 << 2)
+
+/* Structured records.  */
+
+/* Cumulative counter data.  */
+struct gcov_ctr_summary
+{
+  gcov_unsigned_t num;		/* number of counters.  */
+  gcov_unsigned_t runs;		/* number of program runs */
+  gcov_type sum_all;		/* sum of all counters accumulated.  */
+  gcov_type run_max;		/* maximum value on a single run.  */
+  gcov_type sum_max;    	/* sum of individual run max values.  */
+};
+
+/* Object & program summary record.  */
+struct gcov_summary
+{
+  gcov_unsigned_t checksum;	/* checksum of program */
+  struct gcov_ctr_summary ctrs[GCOV_COUNTERS_SUMMABLE];
+};
+
+/* Structures embedded in coveraged program.  The structures generated
+   by write_profile must match these.  */
+
+#if IN_LIBGCOV
+/* Information about counters for a single function.  */
+struct gcov_ctr_info
+{
+  gcov_unsigned_t num;		/* number of counters.  */
+  gcov_type *values;		/* their values.  */
+};
+
+/* Information about a single function.  This uses the trailing array
+   idiom. The number of counters is determined from the merge pointer
+   array in gcov_info.  The key is used to detect which of a set of
+   comdat functions was selected -- it points to the gcov_info object
+   of the object file containing the selected comdat function.  */
+
+struct gcov_fn_info
+{
+  const struct gcov_info *key;		/* comdat key */
+  gcov_unsigned_t ident;		/* unique ident of function */
+  gcov_unsigned_t lineno_checksum;	/* function lineo_checksum */
+  gcov_unsigned_t cfg_checksum;		/* function cfg checksum */
+  struct gcov_ctr_info ctrs[0];		/* instrumented counters */
+};
+
+/* Type of function used to merge counters.  */
+typedef void (*gcov_merge_fn) (gcov_type *, gcov_unsigned_t);
+
+/* Information about a single object file.  */
+struct gcov_info
+{
+  gcov_unsigned_t version;	/* expected version number */
+  struct gcov_info *next;	/* link to next, used by libgcov */
+
+  gcov_unsigned_t stamp;	/* uniquifying time stamp */
+  const char *filename;		/* output file name */
+
+  gcov_merge_fn merge[GCOV_COUNTERS];  /* merge functions (null for
+					  unused) */
+
+  unsigned n_functions;		/* number of functions */
+  const struct gcov_fn_info *const *functions; /* pointer to pointers
+					          to function information  */
+};
+
+/* Register a new object file module.  */
+extern void __gcov_init (struct gcov_info *) ATTRIBUTE_HIDDEN;
+
+#ifndef __COREBOOT__
+/* Called before fork, to avoid double counting.  */
+extern void __gcov_flush (void) ATTRIBUTE_HIDDEN;
+#endif
+
+/* The merge function that just sums the counters.  */
+extern void __gcov_merge_add (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
+
+/* The merge function to choose the most common value.  */
+extern void __gcov_merge_single (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
+
+/* The merge function to choose the most common difference between
+   consecutive values.  */
+extern void __gcov_merge_delta (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
+
+/* The merge function that just ors the counters together.  */
+extern void __gcov_merge_ior (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
+
+/* The profiler functions.  */
+extern void __gcov_interval_profiler (gcov_type *, gcov_type, int, unsigned);
+extern void __gcov_pow2_profiler (gcov_type *, gcov_type);
+extern void __gcov_one_value_profiler (gcov_type *, gcov_type);
+extern void __gcov_indirect_call_profiler (gcov_type *, gcov_type, void *, void *);
+extern void __gcov_average_profiler (gcov_type *, gcov_type);
+extern void __gcov_ior_profiler (gcov_type *, gcov_type);
+
+#ifndef inhibit_libc
+/* The wrappers around some library functions..  */
+extern pid_t __gcov_fork (void) ATTRIBUTE_HIDDEN;
+extern int __gcov_execl (const char *, char *, ...) ATTRIBUTE_HIDDEN;
+extern int __gcov_execlp (const char *, char *, ...) ATTRIBUTE_HIDDEN;
+extern int __gcov_execle (const char *, char *, ...) ATTRIBUTE_HIDDEN;
+extern int __gcov_execv (const char *, char *const []) ATTRIBUTE_HIDDEN;
+extern int __gcov_execvp (const char *, char *const []) ATTRIBUTE_HIDDEN;
+extern int __gcov_execve (const char *, char  *const [], char *const [])
+  ATTRIBUTE_HIDDEN;
+#endif
+
+#endif /* IN_LIBGCOV */
+
+#if IN_LIBGCOV >= 0
+
+/* Optimum number of gcov_unsigned_t's read from or written to disk.  */
+#define GCOV_BLOCK_SIZE (1 << 10)
+
+GCOV_LINKAGE struct gcov_var
+{
+  FILE *file;
+  gcov_position_t start;	/* Position of first byte of block */
+  unsigned offset;		/* Read/write position within the block.  */
+  unsigned length;		/* Read limit in the block.  */
+  unsigned overread;		/* Number of words overread.  */
+  int error;			/* < 0 overflow, > 0 disk error.  */
+  int mode;	                /* < 0 writing, > 0 reading */
+#if IN_LIBGCOV
+  /* Holds one block plus 4 bytes, thus all coverage reads & writes
+     fit within this buffer and we always can transfer GCOV_BLOCK_SIZE
+     to and from the disk. libgcov never backtracks and only writes 4
+     or 8 byte objects.  */
+  gcov_unsigned_t buffer[GCOV_BLOCK_SIZE + 1];
+#else
+  int endian;			/* Swap endianness.  */
+  /* Holds a variable length block, as the compiler can write
+     strings and needs to backtrack.  */
+  size_t alloc;
+  gcov_unsigned_t *buffer;
+#endif
+} gcov_var ATTRIBUTE_HIDDEN;
+
+/* Functions for reading and writing gcov files. In libgcov you can
+   open the file for reading then writing. Elsewhere you can open the
+   file either for reading or for writing. When reading a file you may
+   use the gcov_read_* functions, gcov_sync, gcov_position, &
+   gcov_error. When writing a file you may use the gcov_write
+   functions, gcov_seek & gcov_error. When a file is to be rewritten
+   you use the functions for reading, then gcov_rewrite then the
+   functions for writing.  Your file may become corrupted if you break
+   these invariants.  */
+#if IN_LIBGCOV
+GCOV_LINKAGE int gcov_open (const char */*name*/) ATTRIBUTE_HIDDEN;
+#else
+GCOV_LINKAGE int gcov_open (const char */*name*/, int /*direction*/);
+GCOV_LINKAGE int gcov_magic (gcov_unsigned_t, gcov_unsigned_t);
+#endif
+GCOV_LINKAGE int gcov_close (void) ATTRIBUTE_HIDDEN;
+
+/* Available everywhere.  */
+static gcov_position_t gcov_position (void);
+static int gcov_is_error (void);
+
+GCOV_LINKAGE gcov_unsigned_t gcov_read_unsigned (void) ATTRIBUTE_HIDDEN;
+GCOV_LINKAGE gcov_type gcov_read_counter (void) ATTRIBUTE_HIDDEN;
+GCOV_LINKAGE void gcov_read_summary (struct gcov_summary *) ATTRIBUTE_HIDDEN;
+
+#if IN_LIBGCOV
+/* Available only in libgcov */
+GCOV_LINKAGE void gcov_write_counter (gcov_type) ATTRIBUTE_HIDDEN;
+GCOV_LINKAGE void gcov_write_tag_length (gcov_unsigned_t, gcov_unsigned_t)
+    ATTRIBUTE_HIDDEN;
+GCOV_LINKAGE void gcov_write_summary (gcov_unsigned_t /*tag*/,
+				      const struct gcov_summary *)
+    ATTRIBUTE_HIDDEN;
+static void gcov_rewrite (void);
+GCOV_LINKAGE void gcov_seek (gcov_position_t /*position*/) ATTRIBUTE_HIDDEN;
+#else
+/* Available outside libgcov */
+GCOV_LINKAGE const char *gcov_read_string (void);
+GCOV_LINKAGE void gcov_sync (gcov_position_t /*base*/,
+			     gcov_unsigned_t /*length */);
+#endif
+
+#if !IN_GCOV
+/* Available outside gcov */
+GCOV_LINKAGE void gcov_write_unsigned (gcov_unsigned_t) ATTRIBUTE_HIDDEN;
+#endif
+
+#if !IN_GCOV && !IN_LIBGCOV
+/* Available only in compiler */
+GCOV_LINKAGE void gcov_write_string (const char *);
+GCOV_LINKAGE gcov_position_t gcov_write_tag (gcov_unsigned_t);
+GCOV_LINKAGE void gcov_write_length (gcov_position_t /*position*/);
+#endif
+
+#if IN_GCOV > 0
+/* Available in gcov */
+GCOV_LINKAGE time_t gcov_time (void);
+#endif
+
+/* Save the current position in the gcov file.  */
+
+static inline gcov_position_t
+gcov_position (void)
+{
+  gcc_assert (gcov_var.mode > 0);
+  return gcov_var.start + gcov_var.offset;
+}
+
+/* Return nonzero if the error flag is set.  */
+
+static inline int
+gcov_is_error (void)
+{
+  return gcov_var.file ? gcov_var.error : 1;
+}
+
+#if IN_LIBGCOV
+/* Move to beginning of file and initialize for writing.  */
+
+static inline void
+gcov_rewrite (void)
+{
+  gcc_assert (gcov_var.mode > 0);
+  gcov_var.mode = -1;
+  gcov_var.start = 0;
+  gcov_var.offset = 0;
+  fseek (gcov_var.file, 0L, SEEK_SET);
+}
+#endif
+
+#endif /* IN_LIBGCOV >= 0 */
+
+#endif /* GCC_GCOV_IO_H */
diff --git a/src/lib/gcov-iov.h b/src/lib/gcov-iov.h
new file mode 100644
index 0000000..09951fbb
--- /dev/null
+++ b/src/lib/gcov-iov.h
@@ -0,0 +1,4 @@
+/* Generated automatically by the program `build/gcov-iov'
+   from `4.7.2 (4 7) and  (*)'.  */
+
+#define GCOV_VERSION ((gcov_unsigned_t)0x3430372a)  /* 407* */
diff --git a/src/lib/hardwaremain.c b/src/lib/hardwaremain.c
index 206e82b..eed243a 100644
--- a/src/lib/hardwaremain.c
+++ b/src/lib/hardwaremain.c
@@ -42,6 +42,7 @@
 #if CONFIG_WRITE_HIGH_TABLES
 #include <cbmem.h>
 #endif
+#include <coverage.h>
 #include <timestamp.h>
 
 /**
@@ -62,6 +63,10 @@
 	timestamp_stash(TS_START_RAMSTAGE);
 	post_code(POST_ENTRY_RAMSTAGE);
 
+#if CONFIG_COVERAGE
+	coverage_init();
+#endif
+
 	/* console_init() MUST PRECEDE ALL printk()! */
 	console_init();
 
diff --git a/src/lib/libgcov.c b/src/lib/libgcov.c
new file mode 100644
index 0000000..4adf75e
--- /dev/null
+++ b/src/lib/libgcov.c
@@ -0,0 +1,1157 @@
+/* Routines required for instrumenting a program.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
+   2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009, 2010, 2011
+   Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#define __COREBOOT__
+#ifdef __COREBOOT__
+#include <stdlib.h>
+#include <string.h>
+#include <console/console.h>
+#include <assert.h>
+typedef s32 pid_t;
+#define gcc_assert(x) ASSERT(x)
+#define fprintf(file, x...) printk(BIOS_ERR, x)
+#define alloca(size)   __builtin_alloca (size)
+#include "gcov-glue.c"
+
+/* Define MACROs to be used by coreboot compilation.  */
+# define L_gcov
+# define L_gcov_interval_profiler
+# define L_gcov_pow2_profiler
+# define L_gcov_one_value_profiler
+# define L_gcov_indirect_call_profiler
+# define L_gcov_average_profiler
+# define L_gcov_ior_profiler
+
+# define HAVE_CC_TLS 0
+# define __GCOV_KERNEL__
+
+# define IN_LIBGCOV 1
+# define IN_GCOV 0
+#else /* __COREBOOT__ */
+#include "tconfig.h"
+#include "tsystem.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "libgcc_tm.h"
+#endif /* __COREBOOT__ */
+
+#ifndef __COREBOOT__
+#if defined(inhibit_libc)
+#define IN_LIBGCOV (-1)
+#else
+#undef NULL /* Avoid errors if stdio.h and our stddef.h mismatch.  */
+#include <stdio.h>
+#define IN_LIBGCOV 1
+#if defined(L_gcov)
+#define GCOV_LINKAGE /* nothing */
+#endif
+#endif
+#endif /* __COREBOOT__ */
+#include "gcov-io.h"
+
+#if defined(inhibit_libc)
+/* If libc and its header files are not available, provide dummy functions.  */
+
+#ifdef L_gcov
+void __gcov_init (struct gcov_info *p __attribute__ ((unused))) {}
+void __gcov_flush (void) {}
+#endif
+
+#ifdef L_gcov_merge_add
+void __gcov_merge_add (gcov_type *counters  __attribute__ ((unused)),
+		       unsigned n_counters __attribute__ ((unused))) {}
+#endif
+
+#ifdef L_gcov_merge_single
+void __gcov_merge_single (gcov_type *counters  __attribute__ ((unused)),
+			  unsigned n_counters __attribute__ ((unused))) {}
+#endif
+
+#ifdef L_gcov_merge_delta
+void __gcov_merge_delta (gcov_type *counters  __attribute__ ((unused)),
+			 unsigned n_counters __attribute__ ((unused))) {}
+#endif
+
+#else
+
+#ifndef __COREBOOT__
+#include <string.h>
+#if GCOV_LOCKED
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/stat.h>
+#endif
+#else
+void __gcov_merge_add(gcov_type *counters  __attribute__ ((unused)),
+			unsigned n_counters __attribute__ ((unused))) {}
+#endif /* __COREBOOT__ */
+
+#ifdef L_gcov
+#include "gcov-io.c"
+
+struct gcov_fn_buffer
+{
+  struct gcov_fn_buffer *next;
+  unsigned fn_ix;
+  struct gcov_fn_info info;
+  /* note gcov_fn_info ends in a trailing array.  */
+};
+
+/* Chain of per-object gcov structures.  */
+static struct gcov_info *gcov_list;
+
+/* Size of the longest file name. */
+static size_t gcov_max_filename = 0;
+
+/* Make sure path component of the given FILENAME exists, create
+   missing directories. FILENAME must be writable.
+   Returns zero on success, or -1 if an error occurred.  */
+
+static int
+create_file_directory (char *filename)
+{
+#ifdef __COREBOOT__
+  (void) filename;
+  return 0;
+#else
+#if !defined(TARGET_POSIX_IO) && !defined(_WIN32)
+  (void) filename;
+  return -1;
+#else
+  char *s;
+
+  s = filename;
+
+  if (HAS_DRIVE_SPEC(s))
+    s += 2;
+  if (IS_DIR_SEPARATOR(*s))
+    ++s;
+  for (; *s != '\0'; s++)
+    if (IS_DIR_SEPARATOR(*s))
+      {
+        char sep = *s;
+	*s  = '\0';
+
+        /* Try to make directory if it doesn't already exist.  */
+        if (access (filename, F_OK) == -1
+#ifdef TARGET_POSIX_IO
+            && mkdir (filename, 0755) == -1
+#else
+            && mkdir (filename) == -1
+#endif
+            /* The directory might have been made by another process.  */
+	    && errno != EEXIST)
+	  {
+            fprintf (stderr, "profiling:%s:Cannot create directory\n",
+		     filename);
+            *s = sep;
+	    return -1;
+	  };
+
+	*s = sep;
+      };
+  return 0;
+#endif
+#endif
+}
+
+static struct gcov_fn_buffer *
+free_fn_data (const struct gcov_info *gi_ptr, struct gcov_fn_buffer *buffer,
+	      unsigned limit)
+{
+  struct gcov_fn_buffer *next;
+  unsigned ix, n_ctr = 0;
+
+  if (!buffer)
+    return 0;
+  next = buffer->next;
+
+  for (ix = 0; ix != limit; ix++)
+    if (gi_ptr->merge[ix])
+      free (buffer->info.ctrs[n_ctr++].values);
+  free (buffer);
+  return next;
+}
+
+static struct gcov_fn_buffer **
+buffer_fn_data (const char *filename, const struct gcov_info *gi_ptr,
+		struct gcov_fn_buffer **end_ptr, unsigned fn_ix)
+{
+  unsigned n_ctrs = 0, ix = 0;
+  struct gcov_fn_buffer *fn_buffer;
+  unsigned len;
+
+  for (ix = GCOV_COUNTERS; ix--;)
+    if (gi_ptr->merge[ix])
+      n_ctrs++;
+
+  len = sizeof (*fn_buffer) + sizeof (fn_buffer->info.ctrs[0]) * n_ctrs;
+  fn_buffer = (struct gcov_fn_buffer *)malloc (len);
+
+  if (!fn_buffer)
+    goto fail;
+
+  fn_buffer->next = 0;
+  fn_buffer->fn_ix = fn_ix;
+  fn_buffer->info.ident = gcov_read_unsigned ();
+  fn_buffer->info.lineno_checksum = gcov_read_unsigned ();
+  fn_buffer->info.cfg_checksum = gcov_read_unsigned ();
+
+  for (n_ctrs = ix = 0; ix != GCOV_COUNTERS; ix++)
+    {
+      gcov_unsigned_t length;
+      gcov_type *values;
+
+      if (!gi_ptr->merge[ix])
+	continue;
+
+      if (gcov_read_unsigned () != GCOV_TAG_FOR_COUNTER (ix))
+	{
+	  len = 0;
+	  goto fail;
+	}
+
+      length = GCOV_TAG_COUNTER_NUM (gcov_read_unsigned ());
+      len = length * sizeof (gcov_type);
+      values = (gcov_type *)malloc (len);
+      if (!values)
+	goto fail;
+
+      fn_buffer->info.ctrs[n_ctrs].num = length;
+      fn_buffer->info.ctrs[n_ctrs].values = values;
+
+      while (length--)
+	*values++ = gcov_read_counter ();
+      n_ctrs++;
+    }
+
+  *end_ptr = fn_buffer;
+  return &fn_buffer->next;
+
+fail:
+  fprintf (stderr, "profiling:%s:Function %u %s %u \n", filename, fn_ix,
+	   len ? "cannot allocate" : "counter mismatch", len ? len : ix);
+
+  return (struct gcov_fn_buffer **)free_fn_data (gi_ptr, fn_buffer, ix);
+}
+
+/* Add an unsigned value to the current crc */
+
+static gcov_unsigned_t
+crc32_unsigned (gcov_unsigned_t crc32, gcov_unsigned_t value)
+{
+  unsigned ix;
+
+  for (ix = 32; ix--; value <<= 1)
+    {
+      unsigned feedback;
+
+      feedback = (value ^ crc32) & 0x80000000 ? 0x04c11db7 : 0;
+      crc32 <<= 1;
+      crc32 ^= feedback;
+    }
+
+  return crc32;
+}
+
+/* Check if VERSION of the info block PTR matches libgcov one.
+   Return 1 on success, or zero in case of versions mismatch.
+   If FILENAME is not NULL, its value used for reporting purposes
+   instead of value from the info block.  */
+
+static int
+gcov_version (struct gcov_info *ptr, gcov_unsigned_t version,
+	      const char *filename)
+{
+  if (version != GCOV_VERSION)
+    {
+      char v[4], e[4];
+
+      GCOV_UNSIGNED2STRING (v, version);
+      GCOV_UNSIGNED2STRING (e, GCOV_VERSION);
+
+      fprintf (stderr,
+	       "profiling:%s:Version mismatch - expected %.4s got %.4s\n",
+	       filename? filename : ptr->filename, e, v);
+      return 0;
+    }
+  return 1;
+}
+
+/* Dump the coverage counts. We merge with existing counts when
+   possible, to avoid growing the .da files ad infinitum. We use this
+   program's checksum to make sure we only accumulate whole program
+   statistics to the correct summary. An object file might be embedded
+   in two separate programs, and we must keep the two program
+   summaries separate.  */
+
+static void
+gcov_exit (void)
+{
+  struct gcov_info *gi_ptr;
+  const struct gcov_fn_info *gfi_ptr;
+  struct gcov_summary this_prg; /* summary for program.  */
+  struct gcov_summary all_prg;  /* summary for all instances of program.  */
+  struct gcov_ctr_summary *cs_ptr;
+  const struct gcov_ctr_info *ci_ptr;
+  unsigned t_ix;
+  int f_ix = 0;
+  gcov_unsigned_t c_num;
+  const char *gcov_prefix;
+  int gcov_prefix_strip = 0;
+  size_t prefix_length;
+  char *gi_filename, *gi_filename_up;
+  gcov_unsigned_t crc32 = 0;
+
+  memset (&all_prg, 0, sizeof (all_prg));
+  /* Find the totals for this execution.  */
+  memset (&this_prg, 0, sizeof (this_prg));
+  for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)
+    {
+      crc32 = crc32_unsigned (crc32, gi_ptr->stamp);
+      crc32 = crc32_unsigned (crc32, gi_ptr->n_functions);
+ 
+      for (f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions; f_ix++)
+	{
+	  gfi_ptr = gi_ptr->functions[f_ix];
+
+	  if (gfi_ptr && gfi_ptr->key != gi_ptr)
+	    gfi_ptr = 0;
+
+	  crc32 = crc32_unsigned (crc32, gfi_ptr ? gfi_ptr->cfg_checksum : 0);
+	  crc32 = crc32_unsigned (crc32,
+				  gfi_ptr ? gfi_ptr->lineno_checksum : 0);
+	  if (!gfi_ptr)
+	    continue;
+
+	  ci_ptr = gfi_ptr->ctrs;
+	  for (t_ix = 0; t_ix != GCOV_COUNTERS_SUMMABLE; t_ix++)
+	    {
+	      if (!gi_ptr->merge[t_ix])
+		continue;
+
+	      cs_ptr = &this_prg.ctrs[t_ix];
+	      cs_ptr->num += ci_ptr->num;
+	      crc32 = crc32_unsigned (crc32, ci_ptr->num);
+
+	      for (c_num = 0; c_num < ci_ptr->num; c_num++)
+		{
+		  cs_ptr->sum_all += ci_ptr->values[c_num];
+		  if (cs_ptr->run_max < ci_ptr->values[c_num])
+		    cs_ptr->run_max = ci_ptr->values[c_num];
+		}
+	      ci_ptr++;
+	    }
+	}
+    }
+
+#ifndef __COREBOOT__
+  {
+    /* Check if the level of dirs to strip off specified. */
+    char *tmp = getenv("GCOV_PREFIX_STRIP");
+    if (tmp)
+      {
+	gcov_prefix_strip = atoi (tmp);
+	/* Do not consider negative values. */
+	if (gcov_prefix_strip < 0)
+	  gcov_prefix_strip = 0;
+      }
+  }
+
+  /* Get file name relocation prefix.  Non-absolute values are ignored. */
+  gcov_prefix = getenv("GCOV_PREFIX");
+  if (gcov_prefix)
+    {
+      prefix_length = strlen(gcov_prefix);
+
+      /* Remove an unnecessary trailing '/' */
+      if (IS_DIR_SEPARATOR (gcov_prefix[prefix_length - 1]))
+	prefix_length--;
+    }
+  else
+#endif
+    prefix_length = 0;
+
+  /* If no prefix was specified and a prefix stip, then we assume
+     relative.  */
+  if (gcov_prefix_strip != 0 && prefix_length == 0)
+    {
+      gcov_prefix = ".";
+      prefix_length = 1;
+    }
+  /* Allocate and initialize the filename scratch space plus one.  */
+  gi_filename = (char *) alloca (prefix_length + gcov_max_filename + 2);
+  if (prefix_length)
+    memcpy (gi_filename, gcov_prefix, prefix_length);
+  gi_filename_up = gi_filename + prefix_length;
+
+  /* Now merge each file.  */
+  for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)
+    {
+      unsigned n_counts;
+      struct gcov_summary prg; /* summary for this object over all
+				  program.  */
+      struct gcov_ctr_summary *cs_prg, *cs_tprg, *cs_all;
+      int error = 0;
+      gcov_unsigned_t tag, length;
+      gcov_position_t summary_pos = 0;
+      gcov_position_t eof_pos = 0;
+      const char *fname, *s;
+      struct gcov_fn_buffer *fn_buffer = 0;
+      struct gcov_fn_buffer **fn_tail = &fn_buffer;
+
+      fname = gi_ptr->filename;
+
+      /* Avoid to add multiple drive letters into combined path.  */
+      if (prefix_length != 0 && HAS_DRIVE_SPEC(fname))
+        fname += 2;
+
+      /* Build relocated filename, stripping off leading
+         directories from the initial filename if requested. */
+      if (gcov_prefix_strip > 0)
+        {
+          int level = 0;
+          s = fname;
+          if (IS_DIR_SEPARATOR(*s))
+            ++s;
+
+          /* Skip selected directory levels. */
+	  for (; (*s != '\0') && (level < gcov_prefix_strip); s++)
+	    if (IS_DIR_SEPARATOR(*s))
+	      {
+		fname = s;
+		level++;
+	      }
+        }
+
+      /* Update complete filename with stripped original. */
+      if (prefix_length != 0 && !IS_DIR_SEPARATOR (*fname))
+        {
+          /* If prefix is given, add directory separator.  */
+	  strcpy (gi_filename_up, "/");
+	  strcpy (gi_filename_up + 1, fname);
+	}
+      else
+        strcpy (gi_filename_up, fname);
+
+      if (!gcov_open (gi_filename))
+	{
+	  /* Open failed likely due to missed directory.
+	     Create directory and retry to open file. */
+          if (create_file_directory (gi_filename))
+	    {
+	      fprintf (stderr, "profiling:%s:Skip\n", gi_filename);
+	      continue;
+	    }
+	  if (!gcov_open (gi_filename))
+	    {
+              fprintf (stderr, "profiling:%s:Cannot open\n", gi_filename);
+	      continue;
+	    }
+	}
+
+      tag = gcov_read_unsigned ();
+      if (tag)
+	{
+	  /* Merge data from file.  */
+	  if (tag != GCOV_DATA_MAGIC)
+	    {
+	      fprintf (stderr, "profiling:%s:Not a gcov data file\n",
+		       gi_filename);
+	      goto read_fatal;
+	    }
+	  length = gcov_read_unsigned ();
+	  if (!gcov_version (gi_ptr, length, gi_filename))
+	    goto read_fatal;
+
+	  length = gcov_read_unsigned ();
+	  if (length != gi_ptr->stamp)
+	    /* Read from a different compilation. Overwrite the file.  */
+	    goto rewrite;
+
+	  /* Look for program summary.  */
+	  for (f_ix = 0;;)
+	    {
+	      struct gcov_summary tmp;
+
+	      eof_pos = gcov_position ();
+	      tag = gcov_read_unsigned ();
+	      if (tag != GCOV_TAG_PROGRAM_SUMMARY)
+		break;
+
+	      f_ix--;
+	      length = gcov_read_unsigned ();
+	      if (length != GCOV_TAG_SUMMARY_LENGTH)
+		goto read_mismatch;
+	      gcov_read_summary (&tmp);
+	      if ((error = gcov_is_error ()))
+		goto read_error;
+	      if (summary_pos || tmp.checksum != crc32)
+		goto next_summary;
+
+	      for (t_ix = 0; t_ix != GCOV_COUNTERS_SUMMABLE; t_ix++)
+		if (tmp.ctrs[t_ix].num != this_prg.ctrs[t_ix].num)
+		  goto next_summary;
+	      prg = tmp;
+	      summary_pos = eof_pos;
+
+	    next_summary:;
+	    }
+
+	  /* Merge execution counts for each function.  */
+	  for (f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions;
+	       f_ix++, tag = gcov_read_unsigned ())
+	    {
+	      gfi_ptr = gi_ptr->functions[f_ix];
+
+	      if (tag != GCOV_TAG_FUNCTION)
+		goto read_mismatch;
+
+	      length = gcov_read_unsigned ();
+	      if (!length)
+		/* This function did not appear in the other program.
+		   We have nothing to merge.  */
+		continue;
+
+	      if (length != GCOV_TAG_FUNCTION_LENGTH)
+		goto read_mismatch;
+
+	      if (!gfi_ptr || gfi_ptr->key != gi_ptr)
+		{
+		  /* This function appears in the other program.  We
+		     need to buffer the information in order to write
+		     it back out -- we'll be inserting data before
+		     this point, so cannot simply keep the data in the
+		     file.  */
+		  fn_tail = buffer_fn_data (gi_filename,
+					    gi_ptr, fn_tail, f_ix);
+		  if (!fn_tail)
+		    goto read_mismatch;
+		  continue;
+		}
+
+	      length = gcov_read_unsigned ();
+	      if (length != gfi_ptr->ident)
+		goto read_mismatch;
+
+	      length = gcov_read_unsigned ();
+	      if (length != gfi_ptr->lineno_checksum)
+		goto read_mismatch;
+
+	      length = gcov_read_unsigned ();
+	      if (length != gfi_ptr->cfg_checksum)
+		goto read_mismatch;
+
+	      ci_ptr = gfi_ptr->ctrs;
+	      for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++)
+		{
+		  gcov_merge_fn merge = gi_ptr->merge[t_ix];
+
+		  if (!merge)
+		    continue;
+
+		  tag = gcov_read_unsigned ();
+		  length = gcov_read_unsigned ();
+		  if (tag != GCOV_TAG_FOR_COUNTER (t_ix)
+		      || length != GCOV_TAG_COUNTER_LENGTH (ci_ptr->num))
+		    goto read_mismatch;
+		  (*merge) (ci_ptr->values, ci_ptr->num);
+		  ci_ptr++;
+		}
+	      if ((error = gcov_is_error ()))
+		goto read_error;
+	    }
+
+	  if (tag)
+	    {
+	    read_mismatch:;
+	      fprintf (stderr, "profiling:%s:Merge mismatch for %s %u\n",
+		       gi_filename, f_ix >= 0 ? "function" : "summary",
+		       f_ix < 0 ? -1 - f_ix : f_ix);
+	      goto read_fatal;
+	    }
+	}
+      goto rewrite;
+
+    read_error:;
+      fprintf (stderr, "profiling:%s:%s merging\n", gi_filename,
+	       error < 0 ? "Overflow": "Error");
+
+      goto read_fatal;
+
+    rewrite:;
+      gcov_rewrite ();
+      if (!summary_pos)
+	{
+	  memset (&prg, 0, sizeof (prg));
+	  summary_pos = eof_pos;
+	}
+
+      /* Merge the summaries.  */
+      for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++)
+	{
+	  cs_prg = &prg.ctrs[t_ix];
+	  cs_tprg = &this_prg.ctrs[t_ix];
+	  cs_all = &all_prg.ctrs[t_ix];
+
+	  if (gi_ptr->merge[t_ix])
+	    {
+	      if (!cs_prg->runs++)
+		cs_prg->num = cs_tprg->num;
+	      cs_prg->sum_all += cs_tprg->sum_all;
+	      if (cs_prg->run_max < cs_tprg->run_max)
+		cs_prg->run_max = cs_tprg->run_max;
+	      cs_prg->sum_max += cs_tprg->run_max;
+	    }
+	  else if (cs_prg->runs)
+	    goto read_mismatch;
+
+	  if (!cs_all->runs && cs_prg->runs)
+	    memcpy (cs_all, cs_prg, sizeof (*cs_all));
+	  else if (!all_prg.checksum
+		   && (!GCOV_LOCKED || cs_all->runs == cs_prg->runs)
+		   && memcmp (cs_all, cs_prg, sizeof (*cs_all)))
+	    {
+	      fprintf (stderr, "profiling:%s:Invocation mismatch - some data files may have been removed%s\n",
+		       gi_filename, GCOV_LOCKED
+		       ? "" : " or concurrently updated without locking support");
+	      all_prg.checksum = ~0u;
+	    }
+	}
+
+      prg.checksum = crc32;
+
+      /* Write out the data.  */
+      if (!eof_pos)
+	{
+	  gcov_write_tag_length (GCOV_DATA_MAGIC, GCOV_VERSION);
+	  gcov_write_unsigned (gi_ptr->stamp);
+	}
+
+      if (summary_pos)
+	gcov_seek (summary_pos);
+
+      /* Generate whole program statistics.  */
+      gcov_write_summary (GCOV_TAG_PROGRAM_SUMMARY, &prg);
+
+      if (summary_pos < eof_pos)
+	gcov_seek (eof_pos);
+
+      /* Write execution counts for each function.  */
+      for (f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions; f_ix++)
+	{
+	  unsigned buffered = 0;
+
+	  if (fn_buffer && fn_buffer->fn_ix == (unsigned)f_ix)
+	    {
+	      /* Buffered data from another program.  */
+	      buffered = 1;
+	      gfi_ptr = &fn_buffer->info;
+	      length = GCOV_TAG_FUNCTION_LENGTH;
+	    }
+	  else
+	    {
+	      gfi_ptr = gi_ptr->functions[f_ix];
+	      if (gfi_ptr && gfi_ptr->key == gi_ptr)
+		length = GCOV_TAG_FUNCTION_LENGTH;
+	      else
+		length = 0;
+	    }
+
+	  gcov_write_tag_length (GCOV_TAG_FUNCTION, length);
+	  if (!length)
+	    continue;
+
+	  gcov_write_unsigned (gfi_ptr->ident);
+	  gcov_write_unsigned (gfi_ptr->lineno_checksum);
+	  gcov_write_unsigned (gfi_ptr->cfg_checksum);
+
+	  ci_ptr = gfi_ptr->ctrs;
+	  for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++)
+	    {
+	      if (!gi_ptr->merge[t_ix])
+		continue;
+
+	      n_counts = ci_ptr->num;
+	      gcov_write_tag_length (GCOV_TAG_FOR_COUNTER (t_ix),
+				     GCOV_TAG_COUNTER_LENGTH (n_counts));
+	      gcov_type *c_ptr = ci_ptr->values;
+	      while (n_counts--)
+		gcov_write_counter (*c_ptr++);
+	      ci_ptr++;
+	    }
+	  if (buffered)
+	    fn_buffer = free_fn_data (gi_ptr, fn_buffer, GCOV_COUNTERS);
+	}
+
+      gcov_write_unsigned (0);
+
+    read_fatal:;
+      while (fn_buffer)
+	fn_buffer = free_fn_data (gi_ptr, fn_buffer, GCOV_COUNTERS);
+
+      if ((error = gcov_close ()))
+	  fprintf (stderr, error  < 0 ?
+		   "profiling:%s:Overflow writing\n" :
+		   "profiling:%s:Error writing\n",
+		   gi_filename);
+    }
+}
+
+/* Add a new object file onto the bb chain.  Invoked automatically
+   when running an object file's global ctors.  */
+
+void
+__gcov_init (struct gcov_info *info)
+{
+  if (!info->version || !info->n_functions)
+    return;
+  if (gcov_version (info, info->version, 0))
+    {
+      size_t filename_length = strlen(info->filename);
+
+      /* Refresh the longest file name information */
+      if (filename_length > gcov_max_filename)
+        gcov_max_filename = filename_length;
+
+#ifndef __COREBOOT__
+      if (!gcov_list)
+	atexit (gcov_exit);
+#endif
+
+      info->next = gcov_list;
+      gcov_list = info;
+    }
+  info->version = 0;
+}
+
+/* Called before fork or exec - write out profile information gathered so
+   far and reset it to zero.  This avoids duplication or loss of the
+   profile information gathered so far.  */
+
+void
+__gcov_flush (void)
+{
+  const struct gcov_info *gi_ptr;
+
+  gcov_exit ();
+  for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)
+    {
+      unsigned f_ix;
+
+      for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++)
+	{
+	  unsigned t_ix;
+	  const struct gcov_fn_info *gfi_ptr = gi_ptr->functions[f_ix];
+
+	  if (!gfi_ptr || gfi_ptr->key != gi_ptr)
+	    continue;
+	  const struct gcov_ctr_info *ci_ptr = gfi_ptr->ctrs;
+	  for (t_ix = 0; t_ix != GCOV_COUNTERS; t_ix++)
+	    {
+	      if (!gi_ptr->merge[t_ix])
+		continue;
+
+	      memset (ci_ptr->values, 0, sizeof (gcov_type) * ci_ptr->num);
+	      ci_ptr++;
+	    }
+	}
+    }
+}
+
+#endif /* L_gcov */
+
+#ifdef L_gcov_merge_add
+/* The profile merging function that just adds the counters.  It is given
+   an array COUNTERS of N_COUNTERS old counters and it reads the same number
+   of counters from the gcov file.  */
+void
+__gcov_merge_add (gcov_type *counters, unsigned n_counters)
+{
+  for (; n_counters; counters++, n_counters--)
+    *counters += gcov_read_counter ();
+}
+#endif /* L_gcov_merge_add */
+
+#ifdef L_gcov_merge_ior
+/* The profile merging function that just adds the counters.  It is given
+   an array COUNTERS of N_COUNTERS old counters and it reads the same number
+   of counters from the gcov file.  */
+void
+__gcov_merge_ior (gcov_type *counters, unsigned n_counters)
+{
+  for (; n_counters; counters++, n_counters--)
+    *counters |= gcov_read_counter ();
+}
+#endif
+
+#ifdef L_gcov_merge_single
+/* The profile merging function for choosing the most common value.
+   It is given an array COUNTERS of N_COUNTERS old counters and it
+   reads the same number of counters from the gcov file.  The counters
+   are split into 3-tuples where the members of the tuple have
+   meanings:
+  
+   -- the stored candidate on the most common value of the measured entity
+   -- counter
+   -- total number of evaluations of the value  */
+void
+__gcov_merge_single (gcov_type *counters, unsigned n_counters)
+{
+  unsigned i, n_measures;
+  gcov_type value, counter, all;
+
+  gcc_assert (!(n_counters % 3));
+  n_measures = n_counters / 3;
+  for (i = 0; i < n_measures; i++, counters += 3)
+    {
+      value = gcov_read_counter ();
+      counter = gcov_read_counter ();
+      all = gcov_read_counter ();
+
+      if (counters[0] == value)
+	counters[1] += counter;
+      else if (counter > counters[1])
+	{
+	  counters[0] = value;
+	  counters[1] = counter - counters[1];
+	}
+      else
+	counters[1] -= counter;
+      counters[2] += all;
+    }
+}
+#endif /* L_gcov_merge_single */
+
+#ifdef L_gcov_merge_delta
+/* The profile merging function for choosing the most common
+   difference between two consecutive evaluations of the value.  It is
+   given an array COUNTERS of N_COUNTERS old counters and it reads the
+   same number of counters from the gcov file.  The counters are split
+   into 4-tuples where the members of the tuple have meanings:
+
+   -- the last value of the measured entity
+   -- the stored candidate on the most common difference
+   -- counter
+   -- total number of evaluations of the value  */
+void
+__gcov_merge_delta (gcov_type *counters, unsigned n_counters)
+{
+  unsigned i, n_measures;
+  gcov_type value, counter, all;
+
+  gcc_assert (!(n_counters % 4));
+  n_measures = n_counters / 4;
+  for (i = 0; i < n_measures; i++, counters += 4)
+    {
+      /* last = */ gcov_read_counter ();
+      value = gcov_read_counter ();
+      counter = gcov_read_counter ();
+      all = gcov_read_counter ();
+
+      if (counters[1] == value)
+	counters[2] += counter;
+      else if (counter > counters[2])
+	{
+	  counters[1] = value;
+	  counters[2] = counter - counters[2];
+	}
+      else
+	counters[2] -= counter;
+      counters[3] += all;
+    }
+}
+#endif /* L_gcov_merge_delta */
+
+#ifdef L_gcov_interval_profiler
+/* If VALUE is in interval <START, START + STEPS - 1>, then increases the
+   corresponding counter in COUNTERS.  If the VALUE is above or below
+   the interval, COUNTERS[STEPS] or COUNTERS[STEPS + 1] is increased
+   instead.  */
+
+void
+__gcov_interval_profiler (gcov_type *counters, gcov_type value,
+			  int start, unsigned steps)
+{
+  gcov_type delta = value - start;
+  if (delta < 0)
+    counters[steps + 1]++;
+  else if (delta >= steps)
+    counters[steps]++;
+  else
+    counters[delta]++;
+}
+#endif
+
+#ifdef L_gcov_pow2_profiler
+/* If VALUE is a power of two, COUNTERS[1] is incremented.  Otherwise
+   COUNTERS[0] is incremented.  */
+
+void
+__gcov_pow2_profiler (gcov_type *counters, gcov_type value)
+{
+  if (value & (value - 1))
+    counters[0]++;
+  else
+    counters[1]++;
+}
+#endif
+
+/* Tries to determine the most common value among its inputs.  Checks if the
+   value stored in COUNTERS[0] matches VALUE.  If this is the case, COUNTERS[1]
+   is incremented.  If this is not the case and COUNTERS[1] is not zero,
+   COUNTERS[1] is decremented.  Otherwise COUNTERS[1] is set to one and
+   VALUE is stored to COUNTERS[0].  This algorithm guarantees that if this
+   function is called more than 50% of the time with one value, this value
+   will be in COUNTERS[0] in the end.
+
+   In any case, COUNTERS[2] is incremented.  */
+
+static inline void
+__gcov_one_value_profiler_body (gcov_type *counters, gcov_type value)
+{
+  if (value == counters[0])
+    counters[1]++;
+  else if (counters[1] == 0)
+    {
+      counters[1] = 1;
+      counters[0] = value;
+    }
+  else
+    counters[1]--;
+  counters[2]++;
+}
+
+#ifdef L_gcov_one_value_profiler
+void
+__gcov_one_value_profiler (gcov_type *counters, gcov_type value)
+{
+  __gcov_one_value_profiler_body (counters, value);
+}
+#endif
+
+#ifdef L_gcov_indirect_call_profiler
+
+/* By default, the C++ compiler will use function addresses in the
+   vtable entries.  Setting TARGET_VTABLE_USES_DESCRIPTORS to nonzero
+   tells the compiler to use function descriptors instead.  The value
+   of this macro says how many words wide the descriptor is (normally 2),
+   but it may be dependent on target flags.  Since we do not have access
+   to the target flags here we just check to see if it is set and use
+   that to set VTABLE_USES_DESCRIPTORS to 0 or 1.
+
+   It is assumed that the address of a function descriptor may be treated
+   as a pointer to a function.  */
+
+#ifdef TARGET_VTABLE_USES_DESCRIPTORS
+#define VTABLE_USES_DESCRIPTORS 1
+#else
+#define VTABLE_USES_DESCRIPTORS 0
+#endif
+
+/* Tries to determine the most common value among its inputs. */
+void
+__gcov_indirect_call_profiler (gcov_type* counter, gcov_type value,
+			       void* cur_func, void* callee_func)
+{
+  /* If the C++ virtual tables contain function descriptors then one
+     function may have multiple descriptors and we need to dereference
+     the descriptors to see if they point to the same function.  */
+  if (cur_func == callee_func
+      || (VTABLE_USES_DESCRIPTORS && callee_func
+	  && *(void **) cur_func == *(void **) callee_func))
+    __gcov_one_value_profiler_body (counter, value);
+}
+#endif
+
+
+#ifdef L_gcov_average_profiler
+/* Increase corresponding COUNTER by VALUE.  FIXME: Perhaps we want
+   to saturate up.  */
+
+void
+__gcov_average_profiler (gcov_type *counters, gcov_type value)
+{
+  counters[0] += value;
+  counters[1] ++;
+}
+#endif
+
+#ifdef L_gcov_ior_profiler
+/* Increase corresponding COUNTER by VALUE.  FIXME: Perhaps we want
+   to saturate up.  */
+
+void
+__gcov_ior_profiler (gcov_type *counters, gcov_type value)
+{
+  *counters |= value;
+}
+#endif
+
+#ifdef L_gcov_fork
+/* A wrapper for the fork function.  Flushes the accumulated profiling data, so
+   that they are not counted twice.  */
+
+pid_t
+__gcov_fork (void)
+{
+  __gcov_flush ();
+  return fork ();
+}
+#endif
+
+#ifdef L_gcov_execl
+/* A wrapper for the execl function.  Flushes the accumulated profiling data, so
+   that they are not lost.  */
+
+int
+__gcov_execl (const char *path, char *arg, ...)
+{
+  va_list ap, aq;
+  unsigned i, length;
+  char **args;
+
+  __gcov_flush ();
+
+  va_start (ap, arg);
+  va_copy (aq, ap);
+
+  length = 2;
+  while (va_arg (ap, char *))
+    length++;
+  va_end (ap);
+
+  args = (char **) alloca (length * sizeof (void *));
+  args[0] = arg;
+  for (i = 1; i < length; i++)
+    args[i] = va_arg (aq, char *);
+  va_end (aq);
+
+  return execv (path, args);
+}
+#endif
+
+#ifdef L_gcov_execlp
+/* A wrapper for the execlp function.  Flushes the accumulated profiling data, so
+   that they are not lost.  */
+
+int
+__gcov_execlp (const char *path, char *arg, ...)
+{
+  va_list ap, aq;
+  unsigned i, length;
+  char **args;
+
+  __gcov_flush ();
+
+  va_start (ap, arg);
+  va_copy (aq, ap);
+
+  length = 2;
+  while (va_arg (ap, char *))
+    length++;
+  va_end (ap);
+
+  args = (char **) alloca (length * sizeof (void *));
+  args[0] = arg;
+  for (i = 1; i < length; i++)
+    args[i] = va_arg (aq, char *);
+  va_end (aq);
+
+  return execvp (path, args);
+}
+#endif
+
+#ifdef L_gcov_execle
+/* A wrapper for the execle function.  Flushes the accumulated profiling data, so
+   that they are not lost.  */
+
+int
+__gcov_execle (const char *path, char *arg, ...)
+{
+  va_list ap, aq;
+  unsigned i, length;
+  char **args;
+  char **envp;
+
+  __gcov_flush ();
+
+  va_start (ap, arg);
+  va_copy (aq, ap);
+
+  length = 2;
+  while (va_arg (ap, char *))
+    length++;
+  va_end (ap);
+
+  args = (char **) alloca (length * sizeof (void *));
+  args[0] = arg;
+  for (i = 1; i < length; i++)
+    args[i] = va_arg (aq, char *);
+  envp = va_arg (aq, char **);
+  va_end (aq);
+
+  return execve (path, args, envp);
+}
+#endif
+
+#ifdef L_gcov_execv
+/* A wrapper for the execv function.  Flushes the accumulated profiling data, so
+   that they are not lost.  */
+
+int
+__gcov_execv (const char *path, char *const argv[])
+{
+  __gcov_flush ();
+  return execv (path, argv);
+}
+#endif
+
+#ifdef L_gcov_execvp
+/* A wrapper for the execvp function.  Flushes the accumulated profiling data, so
+   that they are not lost.  */
+
+int
+__gcov_execvp (const char *path, char *const argv[])
+{
+  __gcov_flush ();
+  return execvp (path, argv);
+}
+#endif
+
+#ifdef L_gcov_execve
+/* A wrapper for the execve function.  Flushes the accumulated profiling data, so
+   that they are not lost.  */
+
+int
+__gcov_execve (const char *path, char *const argv[], char *const envp[])
+{
+  __gcov_flush ();
+  return execve (path, argv, envp);
+}
+#endif
+#endif /* inhibit_libc */
diff --git a/src/lib/selfboot.c b/src/lib/selfboot.c
index 2556a14..c5fb62a 100644
--- a/src/lib/selfboot.c
+++ b/src/lib/selfboot.c
@@ -32,6 +32,7 @@
 #if CONFIG_COLLECT_TIMESTAMPS
 #include <timestamp.h>
 #endif
+#include <coverage.h>
 
 /* Maximum physical address we can use for the coreboot bounce buffer. */
 #ifndef MAX_ADDR
@@ -518,6 +519,9 @@
 #if CONFIG_COLLECT_TIMESTAMPS
 	timestamp_add_now(TS_SELFBOOT_JUMP);
 #endif
+#if CONFIG_COVERAGE
+	coverage_exit();
+#endif
 
 	/* Before we go off to run the payload, see if
 	 * we stayed within our bounds.
diff --git a/util/cbmem/cbmem.c b/util/cbmem/cbmem.c
index a777a8f..bc6bd6b 100644
--- a/util/cbmem/cbmem.c
+++ b/util/cbmem/cbmem.c
@@ -27,6 +27,8 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/mman.h>
+#include <libgen.h>
+#include <assert.h>
 
 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
 #define MAP_BYTES (1024*1024)
@@ -82,7 +84,7 @@
 	/* Mapped memory must be aligned to page size */
 	p = physical & ~(page - 1);
 
-	debug("Mapping 1MB of physical memory at %zx.\n", p);
+	debug("Mapping 1MB of physical memory at 0x%zx.\n", p);
 
 	v = mmap(NULL, MAP_BYTES, PROT_READ, MAP_SHARED, fd, p);
 
@@ -103,8 +105,13 @@
 
 static void unmap_memory(void)
 {
+	if (mapped_virtual == NULL) {
+		fprintf(stderr, "Error unmapping memory\n");
+		return;
+	}
 	debug("Unmapping 1MB of virtual memory at %p.\n", mapped_virtual);
 	munmap(mapped_virtual, MAP_BYTES);
+	mapped_virtual = NULL;
 }
 
 /*
@@ -347,7 +354,7 @@
 	uint64_t size;
 };
 
-void dump_cbmem_toc(void)
+static void dump_cbmem_toc(void)
 {
 	int i;
 	uint64_t start;
@@ -374,7 +381,7 @@
 		case CBMEM_ID_GDT:       printf("GDT         "); break;
 		case CBMEM_ID_ACPI:      printf("ACPI        "); break;
 		case CBMEM_ID_ACPI_GNVS: printf("ACPI GNVS   "); break;
-		case CBMEM_ID_CBTABLE:   printf("COREBOOTE   "); break;
+		case CBMEM_ID_CBTABLE:   printf("COREBOOT    "); break;
 		case CBMEM_ID_PIRQ:      printf("IRQ TABLE   "); break;
 		case CBMEM_ID_MPTABLE:   printf("SMP TABLE   "); break;
 		case CBMEM_ID_RESUME:    printf("ACPI RESUME "); break;
@@ -384,6 +391,7 @@
 		case CBMEM_ID_MRCDATA:   printf("MRC DATA    "); break;
 		case CBMEM_ID_CONSOLE:   printf("CONSOLE     "); break;
 		case CBMEM_ID_ELOG:      printf("ELOG        "); break;
+		case CBMEM_ID_COVERAGE:  printf("COVERAGE    "); break;
 		default:                 printf("%08x    ",
 						entries[i].id); break;
 		}
@@ -393,7 +401,111 @@
 	unmap_memory();
 }
 
-void print_version(void)
+#define COVERAGE_MAGIC 0x584d4153
+struct file {
+	uint32_t magic;
+	uint32_t next;
+	uint32_t filename;
+	uint32_t data;
+	int offset;
+	int len;
+};
+
+static int mkpath(char *path, mode_t mode)
+{
+	assert (path && *path);
+	char *p;
+	for (p = strchr(path+1, '/'); p; p = strchr(p + 1, '/')) {
+		*p = '\0';
+		if (mkdir(path, mode) == -1) {
+			if (errno != EEXIST) {
+				*p = '/';
+				return -1;
+			}
+		}
+		*p = '/';
+	}
+	return 0;
+}
+
+static void dump_coverage(void)
+{
+	int i, found = 0;
+	uint64_t start;
+	struct cbmem_entry *entries;
+	void *coverage;
+	unsigned long phys_offset;
+#define phys_to_virt(x) ((void *)(unsigned long)(x) + phys_offset)
+
+	if (cbmem.type != LB_MEM_TABLE) {
+		fprintf(stderr, "No coreboot table area found!\n");
+		return;
+	}
+
+	start = unpack_lb64(cbmem.start);
+
+	entries = (struct cbmem_entry *)map_memory(start);
+
+	for (i=0; i<MAX_CBMEM_ENTRIES; i++) {
+		if (entries[i].magic != CBMEM_MAGIC)
+			break;
+		if (entries[i].id == CBMEM_ID_COVERAGE) {
+			found = 1;
+			break;
+		}
+	}
+
+	if (!found) {
+		unmap_memory();
+		fprintf(stderr, "No coverage information found in"
+			" CBMEM area.\n");
+		return;
+	}
+
+	start = entries[i].base;
+	unmap_memory();
+	/* Map coverage area */
+	coverage = map_memory(start);
+	phys_offset = (unsigned long)coverage - (unsigned long)start;
+
+	printf("Dumping coverage data...\n");
+
+	struct file *file = (struct file *)coverage;
+	while (file && file->magic == COVERAGE_MAGIC) {
+		FILE *f;
+		char *filename;
+
+		debug(" -> %s\n", (char *)phys_to_virt(file->filename));
+		filename = strdup((char *)phys_to_virt(file->filename));
+		if (mkpath(filename, 0755) == -1) {
+			perror("Directory for coverage data could "
+				"not be created");
+			exit(1);
+		}
+		f = fopen(filename, "wb");
+		if (!f) {
+			printf("Could not open %s: %s\n",
+				filename, strerror(errno));
+			exit(1);
+		}
+		if (fwrite((void *)phys_to_virt(file->data),
+						file->len, 1, f) != 1) {
+			printf("Could not write to %s: %s\n",
+				filename, strerror(errno));
+			exit(1);
+		}
+		fclose(f);
+		free(filename);
+
+		if (file->next)
+			file = (struct file *)phys_to_virt(file->next);
+		else
+			file = NULL;
+	}
+	unmap_memory();
+}
+
+static void print_version(void)
 {
 	printf("cbmem v%s -- ", CBMEM_VERSION);
 	printf("Copyright (C) 2012 The ChromiumOS Authors.  All rights reserved.\n\n");
@@ -409,11 +521,12 @@
     "along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\n");
 }
 
-void print_usage(const char *name)
+static void print_usage(const char *name)
 {
-	printf("usage: %s [-vh?]\n", name);
+	printf("usage: %s [-cCltVvh?]\n", name);
 	printf("\n"
 	     "   -c | --console:                   print cbmem console\n"
+	     "   -C | --coverage:                  dump coverage information\n"
 	     "   -l | --list:                      print cbmem table of contents\n"
 	     "   -t | --timestamps:                print timestamp information\n"
 	     "   -V | --verbose:                   verbose (debugging) output\n"
@@ -430,12 +543,14 @@
 
 	int print_defaults = 1;
 	int print_console = 0;
+	int print_coverage = 0;
 	int print_list = 0;
 	int print_timestamps = 0;
 
 	int opt, option_index = 0;
 	static struct option long_options[] = {
 		{"console", 0, 0, 'c'},
+		{"coverage", 0, 0, 'C'},
 		{"list", 0, 0, 'l'},
 		{"timestamps", 0, 0, 't'},
 		{"verbose", 0, 0, 'V'},
@@ -443,13 +558,17 @@
 		{"help", 0, 0, 'h'},
 		{0, 0, 0, 0}
 	};
-	while ((opt = getopt_long(argc, argv, "cltVvh?",
+	while ((opt = getopt_long(argc, argv, "cCltVvh?",
 				  long_options, &option_index)) != EOF) {
 		switch (opt) {
 		case 'c':
 			print_console = 1;
 			print_defaults = 0;
 			break;
+		case 'C':
+			print_coverage = 1;
+			print_defaults = 0;
+			break;
 		case 'l':
 			print_list = 1;
 			print_defaults = 0;
@@ -490,6 +609,9 @@
 	if (print_console)
 		dump_console();
 
+	if (print_coverage)
+		dump_coverage();
+
 	if (print_list)
 		dump_cbmem_toc();