Initial import

1 files changed, 562 insertions, 0 deletions

diff --git a/kernel/gcov/gcc_3_4.c b/kernel/gcov/gcc_3_4.c
new file mode 100644
index 000000000..27bc88a35
--- /dev/null
+++ b/kernel/gcov/gcc_3_4.c
@@ -0,0 +1,562 @@
+/*
+ *  This code provides functions to handle gcc's profiling data format
+ *  introduced with gcc 3.4. Future versions of gcc may change the gcov
+ *  format (as happened before), so all format-specific information needs
+ *  to be kept modular and easily exchangeable.
+ *
+ *  This file is based on gcc-internal definitions. Functions and data
+ *  structures are defined to be compatible with gcc counterparts.
+ *  For a better understanding, refer to gcc source: gcc/gcov-io.h.
+ *
+ *    Copyright IBM Corp. 2009
+ *    Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
+ *
+ *    Uses gcc-internal data definitions.
+ */
+
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/seq_file.h>
+#include <linux/vmalloc.h>
+#include "gcov.h"
+
+#define GCOV_COUNTERS		5
+
+static struct gcov_info *gcov_info_head;
+
+/**
+ * struct gcov_fn_info - profiling meta data per function
+ * @ident: object file-unique function identifier
+ * @checksum: function checksum
+ * @n_ctrs: number of values per counter type belonging to this function
+ *
+ * This data is generated by gcc during compilation and doesn't change
+ * at run-time.
+ */
+struct gcov_fn_info {
+	unsigned int ident;
+	unsigned int checksum;
+	unsigned int n_ctrs[0];
+};
+
+/**
+ * struct gcov_ctr_info - profiling data per counter type
+ * @num: number of counter values for this type
+ * @values: array of counter values for this type
+ * @merge: merge function for counter values of this type (unused)
+ *
+ * This data is generated by gcc during compilation and doesn't change
+ * at run-time with the exception of the values array.
+ */
+struct gcov_ctr_info {
+	unsigned int	num;
+	gcov_type	*values;
+	void		(*merge)(gcov_type *, unsigned int);
+};
+
+/**
+ * struct gcov_info - profiling data per object file
+ * @version: gcov version magic indicating the gcc version used for compilation
+ * @next: list head for a singly-linked list
+ * @stamp: time stamp
+ * @filename: name of the associated gcov data file
+ * @n_functions: number of instrumented functions
+ * @functions: function data
+ * @ctr_mask: mask specifying which counter types are active
+ * @counts: counter data per counter type
+ *
+ * This data is generated by gcc during compilation and doesn't change
+ * at run-time with the exception of the next pointer.
+ */
+struct gcov_info {
+	unsigned int			version;
+	struct gcov_info		*next;
+	unsigned int			stamp;
+	const char			*filename;
+	unsigned int			n_functions;
+	const struct gcov_fn_info	*functions;
+	unsigned int			ctr_mask;
+	struct gcov_ctr_info		counts[0];
+};
+
+/**
+ * gcov_info_filename - return info filename
+ * @info: profiling data set
+ */
+const char *gcov_info_filename(struct gcov_info *info)
+{
+	return info->filename;
+}
+
+/**
+ * gcov_info_version - return info version
+ * @info: profiling data set
+ */
+unsigned int gcov_info_version(struct gcov_info *info)
+{
+	return info->version;
+}
+
+/**
+ * gcov_info_next - return next profiling data set
+ * @info: profiling data set
+ *
+ * Returns next gcov_info following @info or first gcov_info in the chain if
+ * @info is %NULL.
+ */
+struct gcov_info *gcov_info_next(struct gcov_info *info)
+{
+	if (!info)
+		return gcov_info_head;
+
+	return info->next;
+}
+
+/**
+ * gcov_info_link - link/add profiling data set to the list
+ * @info: profiling data set
+ */
+void gcov_info_link(struct gcov_info *info)
+{
+	info->next = gcov_info_head;
+	gcov_info_head = info;
+}
+
+/**
+ * gcov_info_unlink - unlink/remove profiling data set from the list
+ * @prev: previous profiling data set
+ * @info: profiling data set
+ */
+void gcov_info_unlink(struct gcov_info *prev, struct gcov_info *info)
+{
+	if (prev)
+		prev->next = info->next;
+	else
+		gcov_info_head = info->next;
+}
+
+/* Symbolic links to be created for each profiling data file. */
+const struct gcov_link gcov_link[] = {
+	{ OBJ_TREE, "gcno" },	/* Link to .gcno file in $(objtree). */
+	{ 0, NULL},
+};
+
+/*
+ * Determine whether a counter is active. Based on gcc magic. Doesn't change
+ * at run-time.
+ */
+static int counter_active(struct gcov_info *info, unsigned int type)
+{
+	return (1 << type) & info->ctr_mask;
+}
+
+/* Determine number of active counters. Based on gcc magic. */
+static unsigned int num_counter_active(struct gcov_info *info)
+{
+	unsigned int i;
+	unsigned int result = 0;
+
+	for (i = 0; i < GCOV_COUNTERS; i++) {
+		if (counter_active(info, i))
+			result++;
+	}
+	return result;
+}
+
+/**
+ * gcov_info_reset - reset profiling data to zero
+ * @info: profiling data set
+ */
+void gcov_info_reset(struct gcov_info *info)
+{
+	unsigned int active = num_counter_active(info);
+	unsigned int i;
+
+	for (i = 0; i < active; i++) {
+		memset(info->counts[i].values, 0,
+		       info->counts[i].num * sizeof(gcov_type));
+	}
+}
+
+/**
+ * gcov_info_is_compatible - check if profiling data can be added
+ * @info1: first profiling data set
+ * @info2: second profiling data set
+ *
+ * Returns non-zero if profiling data can be added, zero otherwise.
+ */
+int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info *info2)
+{
+	return (info1->stamp == info2->stamp);
+}
+
+/**
+ * gcov_info_add - add up profiling data
+ * @dest: profiling data set to which data is added
+ * @source: profiling data set which is added
+ *
+ * Adds profiling counts of @source to @dest.
+ */
+void gcov_info_add(struct gcov_info *dest, struct gcov_info *source)
+{
+	unsigned int i;
+	unsigned int j;
+
+	for (i = 0; i < num_counter_active(dest); i++) {
+		for (j = 0; j < dest->counts[i].num; j++) {
+			dest->counts[i].values[j] +=
+				source->counts[i].values[j];
+		}
+	}
+}
+
+/* Get size of function info entry. Based on gcc magic. */
+static size_t get_fn_size(struct gcov_info *info)
+{
+	size_t size;
+
+	size = sizeof(struct gcov_fn_info) + num_counter_active(info) *
+	       sizeof(unsigned int);
+	if (__alignof__(struct gcov_fn_info) > sizeof(unsigned int))
+		size = ALIGN(size, __alignof__(struct gcov_fn_info));
+	return size;
+}
+
+/* Get address of function info entry. Based on gcc magic. */
+static struct gcov_fn_info *get_fn_info(struct gcov_info *info, unsigned int fn)
+{
+	return (struct gcov_fn_info *)
+		((char *) info->functions + fn * get_fn_size(info));
+}
+
+/**
+ * gcov_info_dup - duplicate profiling data set
+ * @info: profiling data set to duplicate
+ *
+ * Return newly allocated duplicate on success, %NULL on error.
+ */
+struct gcov_info *gcov_info_dup(struct gcov_info *info)
+{
+	struct gcov_info *dup;
+	unsigned int i;
+	unsigned int active;
+
+	/* Duplicate gcov_info. */
+	active = num_counter_active(info);
+	dup = kzalloc(sizeof(struct gcov_info) +
+		      sizeof(struct gcov_ctr_info) * active, GFP_KERNEL);
+	if (!dup)
+		return NULL;
+	dup->version		= info->version;
+	dup->stamp		= info->stamp;
+	dup->n_functions	= info->n_functions;
+	dup->ctr_mask		= info->ctr_mask;
+	/* Duplicate filename. */
+	dup->filename		= kstrdup(info->filename, GFP_KERNEL);
+	if (!dup->filename)
+		goto err_free;
+	/* Duplicate table of functions. */
+	dup->functions = kmemdup(info->functions, info->n_functions *
+				 get_fn_size(info), GFP_KERNEL);
+	if (!dup->functions)
+		goto err_free;
+	/* Duplicate counter arrays. */
+	for (i = 0; i < active ; i++) {
+		struct gcov_ctr_info *ctr = &info->counts[i];
+		size_t size = ctr->num * sizeof(gcov_type);
+
+		dup->counts[i].num = ctr->num;
+		dup->counts[i].merge = ctr->merge;
+		dup->counts[i].values = vmalloc(size);
+		if (!dup->counts[i].values)
+			goto err_free;
+		memcpy(dup->counts[i].values, ctr->values, size);
+	}
+	return dup;
+
+err_free:
+	gcov_info_free(dup);
+	return NULL;
+}
+
+/**
+ * gcov_info_free - release memory for profiling data set duplicate
+ * @info: profiling data set duplicate to free
+ */
+void gcov_info_free(struct gcov_info *info)
+{
+	unsigned int active = num_counter_active(info);
+	unsigned int i;
+
+	for (i = 0; i < active ; i++)
+		vfree(info->counts[i].values);
+	kfree(info->functions);
+	kfree(info->filename);
+	kfree(info);
+}
+
+/**
+ * struct type_info - iterator helper array
+ * @ctr_type: counter type
+ * @offset: index of the first value of the current function for this type
+ *
+ * This array is needed to convert the in-memory data format into the in-file
+ * data format:
+ *
+ * In-memory:
+ *   for each counter type
+ *     for each function
+ *       values
+ *
+ * In-file:
+ *   for each function
+ *     for each counter type
+ *       values
+ *
+ * See gcc source gcc/gcov-io.h for more information on data organization.
+ */
+struct type_info {
+	int ctr_type;
+	unsigned int offset;
+};
+
+/**
+ * struct gcov_iterator - specifies current file position in logical records
+ * @info: associated profiling data
+ * @record: record type
+ * @function: function number
+ * @type: counter type
+ * @count: index into values array
+ * @num_types: number of counter types
+ * @type_info: helper array to get values-array offset for current function
+ */
+struct gcov_iterator {
+	struct gcov_info *info;
+
+	int record;
+	unsigned int function;
+	unsigned int type;
+	unsigned int count;
+
+	int num_types;
+	struct type_info type_info[0];
+};
+
+static struct gcov_fn_info *get_func(struct gcov_iterator *iter)
+{
+	return get_fn_info(iter->info, iter->function);
+}
+
+static struct type_info *get_type(struct gcov_iterator *iter)
+{
+	return &iter->type_info[iter->type];
+}
+
+/**
+ * gcov_iter_new - allocate and initialize profiling data iterator
+ * @info: profiling data set to be iterated
+ *
+ * Return file iterator on success, %NULL otherwise.
+ */
+struct gcov_iterator *gcov_iter_new(struct gcov_info *info)
+{
+	struct gcov_iterator *iter;
+
+	iter = kzalloc(sizeof(struct gcov_iterator) +
+		       num_counter_active(info) * sizeof(struct type_info),
+		       GFP_KERNEL);
+	if (iter)
+		iter->info = info;
+
+	return iter;
+}
+
+/**
+ * gcov_iter_free - release memory for iterator
+ * @iter: file iterator to free
+ */
+void gcov_iter_free(struct gcov_iterator *iter)
+{
+	kfree(iter);
+}
+
+/**
+ * gcov_iter_get_info - return profiling data set for given file iterator
+ * @iter: file iterator
+ */
+struct gcov_info *gcov_iter_get_info(struct gcov_iterator *iter)
+{
+	return iter->info;
+}
+
+/**
+ * gcov_iter_start - reset file iterator to starting position
+ * @iter: file iterator
+ */
+void gcov_iter_start(struct gcov_iterator *iter)
+{
+	int i;
+
+	iter->record = 0;
+	iter->function = 0;
+	iter->type = 0;
+	iter->count = 0;
+	iter->num_types = 0;
+	for (i = 0; i < GCOV_COUNTERS; i++) {
+		if (counter_active(iter->info, i)) {
+			iter->type_info[iter->num_types].ctr_type = i;
+			iter->type_info[iter->num_types++].offset = 0;
+		}
+	}
+}
+
+/* Mapping of logical record number to actual file content. */
+#define RECORD_FILE_MAGIC	0
+#define RECORD_GCOV_VERSION	1
+#define RECORD_TIME_STAMP	2
+#define RECORD_FUNCTION_TAG	3
+#define RECORD_FUNCTON_TAG_LEN	4
+#define RECORD_FUNCTION_IDENT	5
+#define RECORD_FUNCTION_CHECK	6
+#define RECORD_COUNT_TAG	7
+#define RECORD_COUNT_LEN	8
+#define RECORD_COUNT		9
+
+/**
+ * gcov_iter_next - advance file iterator to next logical record
+ * @iter: file iterator
+ *
+ * Return zero if new position is valid, non-zero if iterator has reached end.
+ */
+int gcov_iter_next(struct gcov_iterator *iter)
+{
+	switch (iter->record) {
+	case RECORD_FILE_MAGIC:
+	case RECORD_GCOV_VERSION:
+	case RECORD_FUNCTION_TAG:
+	case RECORD_FUNCTON_TAG_LEN:
+	case RECORD_FUNCTION_IDENT:
+	case RECORD_COUNT_TAG:
+		/* Advance to next record */
+		iter->record++;
+		break;
+	case RECORD_COUNT:
+		/* Advance to next count */
+		iter->count++;
+		/* fall through */
+	case RECORD_COUNT_LEN:
+		if (iter->count < get_func(iter)->n_ctrs[iter->type]) {
+			iter->record = 9;
+			break;
+		}
+		/* Advance to next counter type */
+		get_type(iter)->offset += iter->count;
+		iter->count = 0;
+		iter->type++;
+		/* fall through */
+	case RECORD_FUNCTION_CHECK:
+		if (iter->type < iter->num_types) {
+			iter->record = 7;
+			break;
+		}
+		/* Advance to next function */
+		iter->type = 0;
+		iter->function++;
+		/* fall through */
+	case RECORD_TIME_STAMP:
+		if (iter->function < iter->info->n_functions)
+			iter->record = 3;
+		else
+			iter->record = -1;
+		break;
+	}
+	/* Check for EOF. */
+	if (iter->record == -1)
+		return -EINVAL;
+	else
+		return 0;
+}
+
+/**
+ * seq_write_gcov_u32 - write 32 bit number in gcov format to seq_file
+ * @seq: seq_file handle
+ * @v: value to be stored
+ *
+ * Number format defined by gcc: numbers are recorded in the 32 bit
+ * unsigned binary form of the endianness of the machine generating the
+ * file.
+ */
+static int seq_write_gcov_u32(struct seq_file *seq, u32 v)
+{
+	return seq_write(seq, &v, sizeof(v));
+}
+
+/**
+ * seq_write_gcov_u64 - write 64 bit number in gcov format to seq_file
+ * @seq: seq_file handle
+ * @v: value to be stored
+ *
+ * Number format defined by gcc: 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.
+ */
+static int seq_write_gcov_u64(struct seq_file *seq, u64 v)
+{
+	u32 data[2];
+
+	data[0] = (v & 0xffffffffUL);
+	data[1] = (v >> 32);
+	return seq_write(seq, data, sizeof(data));
+}
+
+/**
+ * gcov_iter_write - write data for current pos to seq_file
+ * @iter: file iterator
+ * @seq: seq_file handle
+ *
+ * Return zero on success, non-zero otherwise.
+ */
+int gcov_iter_write(struct gcov_iterator *iter, struct seq_file *seq)
+{
+	int rc = -EINVAL;
+
+	switch (iter->record) {
+	case RECORD_FILE_MAGIC:
+		rc = seq_write_gcov_u32(seq, GCOV_DATA_MAGIC);
+		break;
+	case RECORD_GCOV_VERSION:
+		rc = seq_write_gcov_u32(seq, iter->info->version);
+		break;
+	case RECORD_TIME_STAMP:
+		rc = seq_write_gcov_u32(seq, iter->info->stamp);
+		break;
+	case RECORD_FUNCTION_TAG:
+		rc = seq_write_gcov_u32(seq, GCOV_TAG_FUNCTION);
+		break;
+	case RECORD_FUNCTON_TAG_LEN:
+		rc = seq_write_gcov_u32(seq, 2);
+		break;
+	case RECORD_FUNCTION_IDENT:
+		rc = seq_write_gcov_u32(seq, get_func(iter)->ident);
+		break;
+	case RECORD_FUNCTION_CHECK:
+		rc = seq_write_gcov_u32(seq, get_func(iter)->checksum);
+		break;
+	case RECORD_COUNT_TAG:
+		rc = seq_write_gcov_u32(seq,
+			GCOV_TAG_FOR_COUNTER(get_type(iter)->ctr_type));
+		break;
+	case RECORD_COUNT_LEN:
+		rc = seq_write_gcov_u32(seq,
+				get_func(iter)->n_ctrs[iter->type] * 2);
+		break;
+	case RECORD_COUNT:
+		rc = seq_write_gcov_u64(seq,
+			iter->info->counts[iter->type].
+				values[iter->count + get_type(iter)->offset]);
+		break;
+	}
+	return rc;
+}