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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>
This commit is contained in:
Stefan Reinauer 2012-12-18 16:23:28 -08:00 committed by Ronald G. Minnich
parent 6e21f43008
commit d37ab454d4
20 changed files with 2888 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Makefile.inc
View File

@ -99,6 +99,9 @@ romstage-S-ccopts:=-D__PRE_RAM__
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)

177
documentation/gcov.txt Normal file
View File

@ -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;

18
src/Kconfig
View File

@ -194,6 +194,15 @@ config REQUIRES_BLOB
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 @@ config TRACE
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.

2
src/arch/armv7/Makefile.inc
View File

@ -121,7 +121,7 @@ $(objgenerated)/coreboot_ram.o: $$(ramstage-objs) $(LIBGCC_FILE_NAME)
ifeq ($(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
################################################################################

8
src/arch/armv7/coreboot_ram.ld
View File

@ -38,6 +38,14 @@ SECTIONS
_etext = .;
}
.ctors : {
. = ALIGN(0x100);
__CTOR_LIST__ = .;
*(.ctors);
LONG(0);
__CTOR_END__ = .;
}
.rodata : {
_rodata = .;
. = ALIGN(4);

2
src/arch/x86/Makefile.inc
View File

@ -166,7 +166,7 @@ $(objgenerated)/coreboot_ram.o: $$(ramstage-objs) $(LIBGCC_FILE_NAME)
ifeq ($(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
################################################################################

4
src/arch/x86/boot/acpi.c
View File

@ -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 @@ void suspend_resume(void)
/* 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);
}

8
src/arch/x86/coreboot_ram.ld
View File

@ -39,6 +39,14 @@ SECTIONS
_etext = .;
}
.ctors : {
. = ALIGN(0x100);
__CTOR_LIST__ = .;
*(.ctors);
LONG(0);
__CTOR_END__ = .;
}
.rodata : {
_rodata = .;
. = ALIGN(4);

1
src/include/cbmem.h
View File

@ -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__

21
src/include/coverage.h Normal file
View File

@ -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);

1
src/lib/Makefile.inc
View File

@ -70,6 +70,7 @@ ramstage-$(CONFIG_USBDEBUG) += usbdebug.c
ramstage-$(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

2
src/lib/cbmem.c
View File

@ -260,6 +260,8 @@ void cbmem_list(void)
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);

153
src/lib/gcov-glue.c Normal file
View File

@ -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();
}

552
src/lib/gcov-io.c Normal file
View File

@ -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 */

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src/lib/gcov-io.h Normal file
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/* 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 */

4
src/lib/gcov-iov.h Normal file
View File

@ -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* */

5
src/lib/hardwaremain.c
View File

@ -42,6 +42,7 @@ it with the version available from LANL.
#if CONFIG_WRITE_HIGH_TABLES
#include <cbmem.h>
#endif
#include <coverage.h>
#include <timestamp.h>
/**
@ -62,6 +63,10 @@ void hardwaremain(int boot_complete)
timestamp_stash(TS_START_RAMSTAGE);
post_code(POST_ENTRY_RAMSTAGE);
#if CONFIG_COVERAGE
coverage_init();
#endif
/* console_init() MUST PRECEDE ALL printk()! */
console_init();

1157
src/lib/libgcov.c Normal file
View File

File diff suppressed because it is too large Load Diff

4
src/lib/selfboot.c
View File

@ -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 @@ int selfboot(struct lb_memory *mem, struct cbfs_payload *payload)
#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.

136
util/cbmem/cbmem.c
View File

@ -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 @@ static void *map_memory(u64 physical)
/* 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 *map_memory(u64 physical)
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 @@ struct cbmem_entry {
uint64_t size;
};
void dump_cbmem_toc(void)
static void dump_cbmem_toc(void)
{
int i;
uint64_t start;
@ -374,7 +381,7 @@ void dump_cbmem_toc(void)
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 @@ void dump_cbmem_toc(void)
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 @@ void dump_cbmem_toc(void)
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 @@ void print_version(void)
"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 main(int argc, char** argv)
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 @@ int main(int argc, char** argv)
{"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 @@ int main(int argc, char** argv)
if (print_console)
dump_console();
if (print_coverage)
dump_coverage();
if (print_list)
dump_cbmem_toc();