> > Author: mmacy
> > Date: Sat Feb 23 21:14:00 2019
> > New Revision: 344487
> > URL: https://svnweb.freebsd.org/changeset/base/344487
> >
> > Log:
> > gcov support
> >
> > add gcov support and export results as files in debugfs
> >
> > Reviewed by: hps@
> > MFC after: 1 week
> > Sponsored by: iX Systems
> > Differential Revision: https://reviews.freebsd.org/D19260
And an additional nit, we can never becomre GPL free
if we continue to add GPL code to the system.
> >
> > Added:
> > head/sys/gnu/gcov/
> > head/sys/gnu/gcov/gcc_4_7.c (contents, props changed)
> > head/sys/gnu/gcov/gcov.h (contents, props changed)
> > head/sys/gnu/gcov/gcov_fs.c (contents, props changed)
> > head/sys/gnu/gcov/gcov_subr.c (contents, props changed)
> > Modified:
> > head/sys/conf/files
> > head/sys/conf/kern.mk
> > head/sys/conf/kern.post.mk
> > head/sys/conf/kern.pre.mk
> > head/sys/conf/kmod.mk
> > head/sys/conf/options
> >
> > Modified: head/sys/conf/files
> > ==============================================================================
> > --- head/sys/conf/files Sat Feb 23 21:04:48 2019 (r344486)
> > +++ head/sys/conf/files Sat Feb 23 21:14:00 2019 (r344487)
> > @@ -3726,6 +3726,11 @@ fs/cd9660/cd9660_util.c optional cd9660
> > fs/cd9660/cd9660_vfsops.c optional cd9660
> > fs/cd9660/cd9660_vnops.c optional cd9660
> > fs/cd9660/cd9660_iconv.c optional cd9660_iconv
> > +gnu/gcov/gcc_4_7.c optional gcov
> > +gnu/gcov/gcov_fs.c optional gcov lindebugfs \
> > + compile-with "${LINUXKPI_C}"
> > +gnu/gcov/gcov_subr.c optional gcov
> > +
> > kern/bus_if.m standard
> > kern/clock_if.m standard
> > kern/cpufreq_if.m standard
> > @@ -4473,6 +4478,12 @@ compat/linuxkpi/common/src/linux_slab.c
> > optional comp
> > compat/linuxkpi/common/src/linux_usb.c optional
> > compat_linuxkpi usb \
> > compile-with "${LINUXKPI_C}"
> > compat/linuxkpi/common/src/linux_work.c optional
> > compat_linuxkpi \
> > + compile-with "${LINUXKPI_C}"
> > +
> > +compat/linuxkpi/common/src/linux_seq_file.c optional
> > compat_linuxkpi | lindebugfs \
> > + compile-with "${LINUXKPI_C}"
> > +
> > +compat/lindebugfs/lindebugfs.c optional lindebugfs \
> > compile-with "${LINUXKPI_C}"
> >
> > # OpenFabrics Enterprise Distribution (Infiniband)
> >
> > Modified: head/sys/conf/kern.mk
> > ==============================================================================
> > --- head/sys/conf/kern.mk Sat Feb 23 21:04:48 2019 (r344486)
> > +++ head/sys/conf/kern.mk Sat Feb 23 21:14:00 2019 (r344487)
> > @@ -56,7 +56,7 @@ CWARNEXTRA?= -Wno-error=address
> > \
> > -Wno-error=maybe-uninitialized \
> > -Wno-error=overflow \
> > -Wno-error=sequence-point \
> > - -Wno-error=unused-but-set-variable
> > + -Wno-unused-but-set-variable
> > .if ${COMPILER_VERSION} >= 60100
> > CWARNEXTRA+= -Wno-error=misleading-indentation \
> > -Wno-error=nonnull-compare \
> >
> > Modified: head/sys/conf/kern.post.mk
> > ==============================================================================
> > --- head/sys/conf/kern.post.mk Sat Feb 23 21:04:48 2019
> > (r344486)
> > +++ head/sys/conf/kern.post.mk Sat Feb 23 21:14:00 2019
> > (r344487)
> > @@ -32,6 +32,10 @@ MKMODULESENV+= WITH_EXTRA_TCP_STACKS="${WITH_EXTRA_TCP
> > MKMODULESENV+= SAN_CFLAGS="${SAN_CFLAGS}"
> > .endif
> >
> > +.if defined(GCOV_CFLAGS)
> > +MKMODULESENV+= GCOV_CFLAGS="${GCOV_CFLAGS}"
> > +.endif
> > +
> > # Allow overriding the kernel debug directory, so kernel and user debug
> > may be
> > # installed in different directories. Setting it to "" restores the
> > historical
> > # behavior of installing debug files in the kernel directory.
> >
> > Modified: head/sys/conf/kern.pre.mk
> > ==============================================================================
> > --- head/sys/conf/kern.pre.mk Sat Feb 23 21:04:48 2019
> > (r344486)
> > +++ head/sys/conf/kern.pre.mk Sat Feb 23 21:14:00 2019
> > (r344487)
> > @@ -130,6 +130,15 @@ SAN_CFLAGS+= -fsanitize-coverage=trace-pc
> >
> > CFLAGS+= ${SAN_CFLAGS}
> >
> > +GCOV_ENABLED!= grep GCOV opt_global.h || true ; echo
> > +.if !empty(GCOV_ENABLED)
> > +.if ${COMPILER_TYPE} == "gcc"
> > +GCOV_CFLAGS+= -fprofile-arcs -ftest-coverage
> > +.endif
> > +.endif
> > +
> > +CFLAGS+= ${GCOV_CFLAGS}
> > +
> > # Put configuration-specific C flags last (except for ${PROF}) so that they
> > # can override the others.
> > CFLAGS+= ${CONF_CFLAGS}
> >
> > Modified: head/sys/conf/kmod.mk
> > ==============================================================================
> > --- head/sys/conf/kmod.mk Sat Feb 23 21:04:48 2019 (r344486)
> > +++ head/sys/conf/kmod.mk Sat Feb 23 21:14:00 2019 (r344487)
> > @@ -380,6 +380,9 @@ ${_src}:
> > # Add the sanitizer C flags
> > CFLAGS+= ${SAN_CFLAGS}
> >
> > +# Add the gcov flags
> > +CFLAGS+= ${GCOV_CFLAGS}
> > +
> > # Respect configuration-specific C flags.
> > CFLAGS+= ${ARCH_FLAGS} ${CONF_CFLAGS}
> >
> >
> > Modified: head/sys/conf/options
> > ==============================================================================
> > --- head/sys/conf/options Sat Feb 23 21:04:48 2019 (r344486)
> > +++ head/sys/conf/options Sat Feb 23 21:14:00 2019 (r344487)
> > @@ -1013,3 +1013,7 @@ NVME_USE_NVD opt_nvme.h
> >
> > # amdsbwd options
> > AMDSBWD_DEBUG opt_amdsbwd.h
> > +
> > +# gcov support
> > +GCOV opt_global.h
> > +LINDEBUGFS
> >
> > Added: head/sys/gnu/gcov/gcc_4_7.c
> > ==============================================================================
> > --- /dev/null 00:00:00 1970 (empty, because file is newly added)
> > +++ head/sys/gnu/gcov/gcc_4_7.c Sat Feb 23 21:14:00 2019
> > (r344487)
> > @@ -0,0 +1,597 @@
> > +// SPDX-License-Identifier: GPL-2.0
>
> The open item on the SPDX only use needs to be dealt with on a repository
> of local tag to file location, etc. I still feel very uncorftable with
> most of that, especially given the GPL 2 itsel clearly says to place
> "this body of text" in your file. I do not know that you can modify that
> aspect of it and have it still be called gpl 2.0.
>
> > +/*
> > + * This code provides functions to handle gcc's profiling data format
> > + * introduced with gcc 4.7.
> > + *
> > + * This file is based heavily on gcc_3_4.c file.
> > + *
> > + * For a better understanding, refer to gcc source:
> > + * gcc/gcov-io.h
> > + * libgcc/libgcov.c
> > + *
> > + * Uses gcc-internal data definitions.
> > + */
> > +
> > +
> > +#include <sys/cdefs.h>
> > +__FBSDID("$FreeBSD$");
> > +
> > +#include <sys/param.h>
> > +#include <sys/systm.h>
> > +#include <sys/types.h>
> > +#include <sys/systm.h>
> > +#include <sys/sbuf.h>
> > +#include <sys/malloc.h>
> > +#include <sys/module.h>
> > +#include <gnu/gcov/gcov.h>
> > +
> > +
> > +#if (__GNUC__ >= 7)
> > +#define GCOV_COUNTERS 9
> > +#elif (__GNUC__ > 5) || (__GNUC__ == 5 && __GNUC_MINOR__ >= 1)
> > +#define GCOV_COUNTERS 10
> > +#elif __GNUC__ == 4 && __GNUC_MINOR__ >= 9
> > +#define GCOV_COUNTERS 9
> > +#else
> > +#define GCOV_COUNTERS 8
> > +#endif
> > +
> > +#define GCOV_TAG_FUNCTION_LENGTH 3
> > +
> > +static struct gcov_info *gcov_info_head;
> > +
> > +/**
> > + * struct gcov_ctr_info - information about counters for a single function
> > + * @num: number of counter values for this type
> > + * @values: array of counter values for this type
> > + *
> > + * 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;
> > +};
> > +
> > +/**
> > + * struct gcov_fn_info - profiling meta data per function
> > + * @key: comdat key
> > + * @ident: unique ident of function
> > + * @lineno_checksum: function lineo_checksum
> > + * @cfg_checksum: function cfg checksum
> > + * @ctrs: instrumented counters
> > + *
> > + * This data is generated by gcc during compilation and doesn't change
> > + * at run-time.
> > + *
> > + * 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;
> > + unsigned int ident;
> > + unsigned int lineno_checksum;
> > + unsigned int cfg_checksum;
> > + struct gcov_ctr_info ctrs[0];
> > +};
> > +
> > +/**
> > + * 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: uniquifying time stamp
> > + * @filename: name of the associated gcov data file
> > + * @merge: merge functions (null for unused counter type)
> > + * @n_functions: number of instrumented functions
> > + * @functions: pointer to pointers to function information
> > + *
> > + * 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;
> > + void (*merge[GCOV_COUNTERS])(gcov_type *, unsigned int);
> > + unsigned int n_functions;
> > + struct gcov_fn_info **functions;
> > +};
> > +
> > +/**
> > + * 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. Doesn't change at run-time.
> > + */
> > +static int
> > +counter_active(struct gcov_info *info, unsigned int type)
> > +{
> > + return (info->merge[type] ? 1 : 0);
> > +}
> > +
> > +/* 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)
> > +{
> > + struct gcov_ctr_info *ci_ptr;
> > + unsigned int fi_idx;
> > + unsigned int ct_idx;
> > +
> > + for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
> > + ci_ptr = info->functions[fi_idx]->ctrs;
> > +
> > + for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
> > + if (!counter_active(info, ct_idx))
> > + continue;
> > +
> > + memset(ci_ptr->values, 0,
> > + sizeof(gcov_type) * ci_ptr->num);
> > + ci_ptr++;
> > + }
> > + }
> > +}
> > +
> > +/**
> > + * 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 *dst, struct gcov_info *src)
> > +{
> > + struct gcov_ctr_info *dci_ptr;
> > + struct gcov_ctr_info *sci_ptr;
> > + unsigned int fi_idx;
> > + unsigned int ct_idx;
> > + unsigned int val_idx;
> > +
> > + for (fi_idx = 0; fi_idx < src->n_functions; fi_idx++) {
> > + dci_ptr = dst->functions[fi_idx]->ctrs;
> > + sci_ptr = src->functions[fi_idx]->ctrs;
> > +
> > + for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
> > + if (!counter_active(src, ct_idx))
> > + continue;
> > +
> > + for (val_idx = 0; val_idx < sci_ptr->num; val_idx++)
> > + dci_ptr->values[val_idx] +=
> > + sci_ptr->values[val_idx];
> > +
> > + dci_ptr++;
> > + sci_ptr++;
> > + }
> > + }
> > +}
> > +
> > +/**
> > + * 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;
> > + struct gcov_ctr_info *dci_ptr; /* dst counter info */
> > + struct gcov_ctr_info *sci_ptr; /* src counter info */
> > + unsigned int active;
> > + unsigned int fi_idx; /* function info idx */
> > + unsigned int ct_idx; /* counter type idx */
> > + size_t fi_size; /* function info size */
> > + size_t cv_size; /* counter values size */
> > +
> > + if ((dup = malloc(sizeof(*dup), M_GCOV, M_NOWAIT|M_ZERO)) == NULL)
> > + return (NULL);
> > + memcpy(dup, info, sizeof(*dup));
> > +
> > + dup->next = NULL;
> > + dup->filename = NULL;
> > + dup->functions = NULL;
> > +
> > + dup->filename = strdup_flags(info->filename, M_GCOV, M_NOWAIT);
> > + if (dup->filename == NULL)
> > + goto err_free;
> > +
> > + dup->functions = malloc(info->n_functions * sizeof(struct gcov_fn_info
> > *), M_GCOV, M_NOWAIT|M_ZERO);
> > + if (dup->functions == NULL)
> > + goto err_free;
> > + active = num_counter_active(info);
> > + fi_size = sizeof(struct gcov_fn_info);
> > + fi_size += sizeof(struct gcov_ctr_info) * active;
> > +
> > + for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
> > + dup->functions[fi_idx] = malloc(fi_size, M_GCOV,
> > M_NOWAIT|M_ZERO);
> > + if (!dup->functions[fi_idx])
> > + goto err_free;
> > +
> > + *(dup->functions[fi_idx]) = *(info->functions[fi_idx]);
> > +
> > + sci_ptr = info->functions[fi_idx]->ctrs;
> > + dci_ptr = dup->functions[fi_idx]->ctrs;
> > +
> > + for (ct_idx = 0; ct_idx < active; ct_idx++) {
> > +
> > + cv_size = sizeof(gcov_type) * sci_ptr->num;
> > +
> > + dci_ptr->values = malloc(cv_size, M_GCOV, M_NOWAIT);
> > +
> > + if (!dci_ptr->values)
> > + goto err_free;
> > +
> > + dci_ptr->num = sci_ptr->num;
> > + memcpy(dci_ptr->values, sci_ptr->values, cv_size);
> > +
> > + sci_ptr++;
> > + dci_ptr++;
> > + }
> > + }
> > +
> > + 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;
> > + unsigned int fi_idx;
> > + unsigned int ct_idx;
> > + struct gcov_ctr_info *ci_ptr;
> > +
> > + if (!info->functions)
> > + goto free_info;
> > +
> > + active = num_counter_active(info);
> > +
> > + for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
> > + if (!info->functions[fi_idx])
> > + continue;
> > +
> > + ci_ptr = info->functions[fi_idx]->ctrs;
> > +
> > + for (ct_idx = 0; ct_idx < active; ct_idx++, ci_ptr++)
> > + free(ci_ptr->values, M_GCOV);
> > +
> > + free(info->functions[fi_idx], M_GCOV);
> > + }
> > +
> > +free_info:
> > + free(info->functions, M_GCOV);
> > + free(__DECONST(char *, info->filename), M_GCOV);
> > + free(info, M_GCOV);
> > + }
> > +
> > +#define ITER_STRIDE PAGE_SIZE
> > +
> > +/**
> > + * struct gcov_iterator - specifies current file position in logical
> > records
> > + * @info: associated profiling data
> > + * @buffer: buffer containing file data
> > + * @size: size of buffer
> > + * @pos: current position in file
> > + */
> > +struct gcov_iterator {
> > + struct gcov_info *info;
> > + caddr_t buffer;
> > + size_t size;
> > + off_t pos;
> > +};
> > +
> > +/**
> > + * store_gcov_uint32 - store 32 bit number in gcov format to buffer
> > + * @buffer: target buffer or NULL
> > + * @off: offset into the buffer
> > + * @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. Returns the number of bytes stored. If @buffer is %NULL, doesn't
> > + * store anything.
> > + */
> > +static size_t
> > +store_gcov_uint32(void *buffer, size_t off, uint32_t v)
> > +{
> > + uint32_t *data;
> > +
> > + if (buffer) {
> > + data = (void*)((caddr_t)buffer + off);
> > + *data = v;
> > + }
> > +
> > + return sizeof(*data);
> > +}
> > +
> > +/**
> > + * store_gcov_uint64 - store 64 bit number in gcov format to buffer
> > + * @buffer: target buffer or NULL
> > + * @off: offset into the buffer
> > + * @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. Returns the number of bytes stored. If @buffer is %NULL, doesn't
> > store
> > + * anything.
> > + */
> > +
> > +static size_t
> > +store_gcov_uint64(void *buffer, size_t off, uint64_t v)
> > +{
> > + uint32_t *data;
> > +
> > + if (buffer) {
> > + data = (void*)((caddr_t)buffer + off);
> > +
> > + data[0] = (v & 0xffffffffUL);
> > + data[1] = (v >> 32);
> > + }
> > +
> > + return sizeof(*data) * 2;
> > +}
> > +
> > +/**
> > + * convert_to_gcda - convert profiling data set to gcda file format
> > + * @buffer: the buffer to store file data or %NULL if no data should be
> > stored
> > + * @info: profiling data set to be converted
> > + *
> > + * Returns the number of bytes that were/would have been stored into the
> > buffer.
> > + */
> > +static size_t
> > +convert_to_gcda(char *buffer, struct gcov_info *info)
> > +{
> > + struct gcov_fn_info *fi_ptr;
> > + struct gcov_ctr_info *ci_ptr;
> > + unsigned int fi_idx;
> > + unsigned int ct_idx;
> > + unsigned int cv_idx;
> > + size_t pos = 0;
> > +
> > + /* File header. */
> > + pos += store_gcov_uint32(buffer, pos, GCOV_DATA_MAGIC);
> > + pos += store_gcov_uint32(buffer, pos, info->version);
> > + pos += store_gcov_uint32(buffer, pos, info->stamp);
> > +
> > + for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) {
> > + fi_ptr = info->functions[fi_idx];
> > +
> > + /* Function record. */
> > + pos += store_gcov_uint32(buffer, pos, GCOV_TAG_FUNCTION);
> > + pos += store_gcov_uint32(buffer, pos, GCOV_TAG_FUNCTION_LENGTH);
> > + pos += store_gcov_uint32(buffer, pos, fi_ptr->ident);
> > + pos += store_gcov_uint32(buffer, pos, fi_ptr->lineno_checksum);
> > + pos += store_gcov_uint32(buffer, pos, fi_ptr->cfg_checksum);
> > +
> > + ci_ptr = fi_ptr->ctrs;
> > +
> > + for (ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++) {
> > + if (!counter_active(info, ct_idx))
> > + continue;
> > +
> > + /* Counter record. */
> > + pos += store_gcov_uint32(buffer, pos,
> > + GCOV_TAG_FOR_COUNTER(ct_idx));
> > + pos += store_gcov_uint32(buffer, pos, ci_ptr->num * 2);
> > +
> > + for (cv_idx = 0; cv_idx < ci_ptr->num; cv_idx++) {
> > + pos += store_gcov_uint64(buffer, pos,
> > + ci_ptr->values[cv_idx]);
> > + }
> > +
> > + ci_ptr++;
> > + }
> > + }
> > +
> > + return (pos);
> > +}
> > +
> > +/**
> > + * 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 = malloc(sizeof(struct gcov_iterator), M_GCOV, M_NOWAIT|M_ZERO);
> > + if (iter == NULL)
> > + goto err_free;
> > +
> > + iter->info = info;
> > + /* Dry-run to get the actual buffer size. */
> > + iter->size = convert_to_gcda(NULL, info);
> > + iter->buffer = malloc(iter->size, M_GCOV, M_NOWAIT);
> > + if (!iter->buffer)
> > + goto err_free;
> > +
> > + convert_to_gcda(iter->buffer, info);
> > +
> > + return iter;
> > +
> > +err_free:
> > + free(iter, M_GCOV);
> > + return (NULL);
> > +}
> > +
> > +
> > +/**
> > + * gcov_iter_get_info - return profiling data set for given file iterator
> > + * @iter: file iterator
> > + */
> > +void
> > +gcov_iter_free(struct gcov_iterator *iter)
> > +{
> > + free(iter->buffer, M_GCOV);
> > + free(iter, M_GCOV);
> > +}
> > +
> > +/**
> > + * 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)
> > +{
> > + iter->pos = 0;
> > +}
> > +
> > +/**
> > + * 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)
> > +{
> > + if (iter->pos < iter->size)
> > + iter->pos += ITER_STRIDE;
> > +
> > + if (iter->pos >= iter->size)
> > + return (EINVAL);
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * 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 sbuf *sbuf)
> > +{
> > + size_t len;
> > +
> > + if (iter->pos >= iter->size)
> > + return (EINVAL);
> > +
> > + len = ITER_STRIDE;
> > + if (iter->pos + len > iter->size)
> > + len = iter->size - iter->pos;
> > +
> > + sbuf_bcat(sbuf, iter->buffer + iter->pos, len);
> > +
> > + return (0);
> > +}
> >
> > Added: head/sys/gnu/gcov/gcov.h
> > ==============================================================================
> > --- /dev/null 00:00:00 1970 (empty, because file is newly added)
> > +++ head/sys/gnu/gcov/gcov.h Sat Feb 23 21:14:00 2019
> > (r344487)
> > @@ -0,0 +1,99 @@
> > +/*-
> > + * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
> > + *
> > + * Copyright (c) 2019, Matthew Macy <mm...@freebsd.org>
> > + *
> > + * Redistribution and use in source and binary forms, with or without
> > + * modification, are permitted provided that the following conditions
> > + * are met:
> > + * 1. Redistributions of source code must retain the above copyright
> > + * notice, this list of conditions and the following disclaimer.
> > + * 2. Redistributions in binary form must reproduce the above copyright
> > + * notice, this list of conditions and the following disclaimer in the
> > + * documentation and/or other materials provided with the distribution.
> > + *
> > + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
> > + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
> > + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
> > PURPOSE
> > + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
> > + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
> > CONSEQUENTIAL
> > + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
> > + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
> > + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
> > STRICT
> > + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
> > WAY
> > + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
> > + * SUCH DAMAGE.
> > + *
> > + * $FreeBSD$
> > + *
> > + */
> > +
> > +#ifndef _SYS_GCOV_H_
> > +#define _SYS_GCOV_H_
> > +
> > +MALLOC_DECLARE(M_GCOV);
> > +
> > +/*
> > + * Profiling data types used for gcc 3.4 and above - these are defined by
> > + * gcc and need to be kept as close to the original definition as possible
> > to
> > + * remain compatible.
> > + */
> > +#define GCOV_DATA_MAGIC ((unsigned int) 0x67636461)
> > +#define GCOV_TAG_FUNCTION ((unsigned int) 0x01000000)
> > +#define GCOV_TAG_COUNTER_BASE ((unsigned int) 0x01a10000)
> > +#define GCOV_TAG_FOR_COUNTER(count)
> > \
> > + (GCOV_TAG_COUNTER_BASE + ((unsigned int) (count) << 17))
> > +
> > +typedef uint64_t gcov_type;
> > +
> > +/* Opaque gcov_info. The gcov structures can change as for example in gcc
> > 4.7 so
> > + * we cannot use full definition here and they need to be placed in gcc
> > specific
> > + * implementation of gcov. This also means no direct access to the members
> > in
> > + * generic code and usage of the interface below.*/
> > +struct gcov_info;
> > +
> > +/* Interface to access gcov_info data */
> > +const char *gcov_info_filename(struct gcov_info *info);
> > +unsigned int gcov_info_version(struct gcov_info *info);
> > +struct gcov_info *gcov_info_next(struct gcov_info *info);
> > +void gcov_info_link(struct gcov_info *info);
> > +void gcov_info_unlink(struct gcov_info *prev, struct gcov_info *info);
> > +
> > +/* Base interface. */
> > +enum gcov_action {
> > + GCOV_ADD,
> > + GCOV_REMOVE,
> > +};
> > +
> > +/* Iterator control. */
> > +struct gcov_iterator;
> > +
> > +struct gcov_iterator *gcov_iter_new(struct gcov_info *info);
> > +void gcov_iter_free(struct gcov_iterator *iter);
> > +void gcov_iter_start(struct gcov_iterator *iter);
> > +int gcov_iter_next(struct gcov_iterator *iter);
> > +int gcov_iter_write(struct gcov_iterator *iter, struct sbuf *sbuf);
> > +struct gcov_info *gcov_iter_get_info(struct gcov_iterator *iter);
> > +
> > +/* gcov_info control. */
> > +void gcov_info_reset(struct gcov_info *info);
> > +int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info
> > *info2);
> > +void gcov_info_add(struct gcov_info *dest, struct gcov_info *source);
> > +struct gcov_info *gcov_info_dup(struct gcov_info *info);
> > +void gcov_info_free(struct gcov_info *info);
> > +void gcov_stats_reset(void);
> > +void gcov_enable_events(void);
> > +void gcov_module_unload(void *, module_t);
> > +void gcov_fs_init(void);
> > +
> > +int within_module(vm_offset_t addr, module_t mod);
> > +
> > +struct gcov_link {
> > + enum {
> > + OBJ_TREE,
> > + SRC_TREE,
> > + } dir;
> > + const char *ext;
> > +};
> > +extern const struct gcov_link gcov_link[];
> > +#endif
> >
> > Added: head/sys/gnu/gcov/gcov_fs.c
> > ==============================================================================
> > --- /dev/null 00:00:00 1970 (empty, because file is newly added)
> > +++ head/sys/gnu/gcov/gcov_fs.c Sat Feb 23 21:14:00 2019
> > (r344487)
> > @@ -0,0 +1,945 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * This code exports profiling data as debugfs files to userspace.
> > + *
> > + * Copyright IBM Corp. 2009
> > + * Author(s): Peter Oberparleiter <ober...@linux.vnet.ibm.com>
> > + *
> > + * Uses gcc-internal data definitions.
> > + * Based on the gcov-kernel patch by:
> > + * Hubertus Franke <fran...@us.ibm.com>
> > + * Nigel Hinds <nhi...@us.ibm.com>
> > + * Rajan Ravindran <raja...@us.ibm.com>
> > + * Peter Oberparleiter <ober...@linux.vnet.ibm.com>
> > + * Paul Larson
> > + * Yi CDL Yang
> > + */
> > +
> > +
> > +#include <sys/cdefs.h>
> > +__FBSDID("$FreeBSD$");
> > +
> > +#include <sys/types.h>
> > +#include <sys/systm.h>
> > +#include <sys/param.h>
> > +#include <sys/sbuf.h>
> > +
> > +#include <sys/queue.h>
> > +#include <sys/linker.h>
> > +#include <sys/module.h>
> > +#include <sys/eventhandler.h>
> > +#include <sys/kernel.h>
> > +#include <sys/malloc.h>
> > +#include <sys/syslog.h>
> > +#include <sys/proc.h>
> > +#include <sys/sched.h>
> > +#include <sys/syslog.h>
> > +#include <sys/sysctl.h>
> > +#include <linux/debugfs.h>
> > +
> > +#include <gnu/gcov/gcov.h>
> > +#include <sys/queue.h>
> > +
> > +extern int gcov_events_enabled;
> > +static int gcov_persist;
> > +static struct mtx gcov_mtx;
> > +MTX_SYSINIT(gcov_init, &gcov_mtx, "gcov_mtx", MTX_DEF);
> > +MALLOC_DEFINE(M_GCOV, "gcov", "gcov");
> > +
> > +void __gcov_init(struct gcov_info *info);
> > +void __gcov_flush(void);
> > +void __gcov_merge_add(gcov_type *counters, unsigned int n_counters);
> > +void __gcov_merge_single(gcov_type *counters, unsigned int n_counters);
> > +void __gcov_merge_delta(gcov_type *counters, unsigned int n_counters);
> > +void __gcov_merge_ior(gcov_type *counters, unsigned int n_counters);
> > +void __gcov_merge_time_profile(gcov_type *counters, unsigned int
> > n_counters);
> > +void __gcov_merge_icall_topn(gcov_type *counters, unsigned int n_counters);
> > +void __gcov_exit(void);
> > +
> > +static void gcov_event(enum gcov_action action, struct gcov_info *info);
> > +
> > +
> > +/*
> > + * Private copy taken from libc
> > + */
> > +static char *
> > +(basename)(char *path)
> > +{
> > + char *ptr;
> > +
> > + /*
> > + * If path is a null pointer or points to an empty string,
> > + * basename() shall return a pointer to the string ".".
> > + */
> > + if (path == NULL || *path == '\0')
> > + return (__DECONST(char *, "."));
> > +
> > + /* Find end of last pathname component and null terminate it. */
> > + ptr = path + strlen(path);
> > + while (ptr > path + 1 && *(ptr - 1) == '/')
> > + --ptr;
> > + *ptr-- = '\0';
> > +
> > + /* Find beginning of last pathname component. */
> > + while (ptr > path && *(ptr - 1) != '/')
> > + --ptr;
> > + return (ptr);
> > +}
> > +
> > +/*
> > + * __gcov_init is called by gcc-generated constructor code for each object
> > + * file compiled with -fprofile-arcs.
> > + */
> > +void
> > +__gcov_init(struct gcov_info *info)
> > +{
> > + static unsigned int gcov_version;
> > +
> > + mtx_lock(&gcov_mtx);
> > + if (gcov_version == 0) {
> > + gcov_version = gcov_info_version(info);
> > + /*
> > + * Printing gcc's version magic may prove useful for debugging
> > + * incompatibility reports.
> > + */
> > + log(LOG_INFO, "version magic: 0x%x\n", gcov_version);
> > + }
> > + /*
> > + * Add new profiling data structure to list and inform event
> > + * listener.
> > + */
> > + gcov_info_link(info);
> > + if (gcov_events_enabled)
> > + gcov_event(GCOV_ADD, info);
> > + mtx_unlock(&gcov_mtx);
> > +}
> > +
> > +/*
> > + * These functions may be referenced by gcc-generated profiling code but
> > serve
> > + * no function for kernel profiling.
> > + */
> > +void
> > +__gcov_flush(void)
> > +{
> > + /* Unused. */
> > +}
> > +
> > +void
> > +__gcov_merge_add(gcov_type *counters, unsigned int n_counters)
> > +{
> > + /* Unused. */
> > +}
> > +
> > +void
> > +__gcov_merge_single(gcov_type *counters, unsigned int n_counters)
> > +{
> > + /* Unused. */
> > +}
> > +
> > +void
> > +__gcov_merge_delta(gcov_type *counters, unsigned int n_counters)
> > +{
> > + /* Unused. */
> > +}
> > +
> > +void
> > +__gcov_merge_ior(gcov_type *counters, unsigned int n_counters)
> > +{
> > + /* Unused. */
> > +}
> > +
> > +void
> > +__gcov_merge_time_profile(gcov_type *counters, unsigned int n_counters)
> > +{
> > + /* Unused. */
> > +}
> > +
> > +void
> > +__gcov_merge_icall_topn(gcov_type *counters, unsigned int n_counters)
> > +{
> > + /* Unused. */
> > +}
> > +
> > +void
> > +__gcov_exit(void)
> > +{
> > + /* Unused. */
> > +}
> > +
> > +
> > +/**
> > + * struct gcov_node - represents a debugfs entry
> > + * @entry: list entry for parent's child node list
> > + * @children: child nodes
> > + * @all_entry: list entry for list of all nodes
> > + * @parent: parent node
> > + * @loaded_info: array of pointers to profiling data sets for loaded object
> > + * files.
> > + * @num_loaded: number of profiling data sets for loaded object files.
> > + * @unloaded_info: accumulated copy of profiling data sets for unloaded
> > + * object files. Used only when gcov_persist=1.
> > + * @dentry: main debugfs entry, either a directory or data file
> > + * @links: associated symbolic links
> > + * @name: data file basename
> > + *
> > + * struct gcov_node represents an entity within the gcov/ subdirectory
> > + * of debugfs. There are directory and data file nodes. The latter
> > represent
> > + * the actual synthesized data file plus any associated symbolic links
> > which
> > + * are needed by the gcov tool to work correctly.
> > + */
> > +struct gcov_node {
> > + LIST_ENTRY(gcov_node) children_entry;
> > + LIST_ENTRY(gcov_node) all_entry;
> > + struct {
> > + struct gcov_node *lh_first;
> > + } children;
> > + struct gcov_node *parent;
> > + struct gcov_info **loaded_info;
> > + struct gcov_info *unloaded_info;
> > + struct dentry *dentry;
> > + struct dentry **links;
> > + int num_loaded;
> > + char name[0];
> > +};
> > +
> >
> > *** DIFF OUTPUT TRUNCATED AT 1000 LINES ***
> >
> >
>
> --
> Rod Grimes rgri...@freebsd.org
>
>
--
Rod Grimes rgri...@freebsd.org
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