diff options
Diffstat (limited to 'kernel/gcov')
| -rw-r--r-- | kernel/gcov/Kconfig | 14 | ||||
| -rw-r--r-- | kernel/gcov/Makefile | 7 | ||||
| -rw-r--r-- | kernel/gcov/base.c | 136 | ||||
| -rw-r--r-- | kernel/gcov/clang.c | 393 | ||||
| -rw-r--r-- | kernel/gcov/fs.c | 192 | ||||
| -rw-r--r-- | kernel/gcov/gcc_3_4.c | 447 | ||||
| -rw-r--r-- | kernel/gcov/gcc_4_7.c | 436 | ||||
| -rw-r--r-- | kernel/gcov/gcc_base.c | 86 | ||||
| -rw-r--r-- | kernel/gcov/gcov.h | 85 |
9 files changed, 1157 insertions, 639 deletions
diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig index d4da55d1fb65..04f4ebdc3cf5 100644 --- a/kernel/gcov/Kconfig +++ b/kernel/gcov/Kconfig @@ -1,11 +1,13 @@ +# SPDX-License-Identifier: GPL-2.0-only menu "GCOV-based kernel profiling" config GCOV_KERNEL bool "Enable gcov-based kernel profiling" depends on DEBUG_FS - select CONSTRUCTORS if !UML + depends on !ARCH_WANTS_NO_INSTR || CC_HAS_NO_PROFILE_FN_ATTR + select CONSTRUCTORS default n - ---help--- + help This option enables gcov-based code profiling (e.g. for code coverage measurements). @@ -32,12 +34,16 @@ config GCOV_KERNEL Note that the debugfs filesystem has to be mounted to access profiling data. +config ARCH_HAS_GCOV_PROFILE_ALL + def_bool n + config GCOV_PROFILE_ALL bool "Profile entire Kernel" + depends on !COMPILE_TEST depends on GCOV_KERNEL - depends on SUPERH || S390 || X86 || PPC || MICROBLAZE + depends on ARCH_HAS_GCOV_PROFILE_ALL default n - ---help--- + help This options activates profiling for the entire kernel. If unsure, say N. diff --git a/kernel/gcov/Makefile b/kernel/gcov/Makefile index e97ca59e2520..ccd02afaeffb 100644 --- a/kernel/gcov/Makefile +++ b/kernel/gcov/Makefile @@ -1,3 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0 ccflags-y := -DSRCTREE='"$(srctree)"' -DOBJTREE='"$(objtree)"' -obj-$(CONFIG_GCOV_KERNEL) := base.o fs.o gcc_3_4.o +obj-y := base.o fs.o +obj-$(CONFIG_CC_IS_GCC) += gcc_base.o gcc_4_7.o +CFLAGS_gcc_base.o += -Wno-missing-prototypes -Wno-missing-declarations +obj-$(CONFIG_CC_IS_CLANG) += clang.o +CFLAGS_clang.o += -Wno-missing-prototypes -Wno-missing-declarations diff --git a/kernel/gcov/base.c b/kernel/gcov/base.c index 9b22d03cc581..073a3738c5e6 100644 --- a/kernel/gcov/base.c +++ b/kernel/gcov/base.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * This code maintains a list of active profiling data structures. * @@ -18,119 +19,108 @@ #include <linux/init.h> #include <linux/module.h> #include <linux/mutex.h> +#include <linux/sched.h> #include "gcov.h" -static struct gcov_info *gcov_info_head; -static int gcov_events_enabled; -static DEFINE_MUTEX(gcov_lock); +int gcov_events_enabled; +DEFINE_MUTEX(gcov_lock); -/* - * __gcov_init is called by gcc-generated constructor code for each object - * file compiled with -fprofile-arcs. +/** + * gcov_enable_events - enable event reporting through gcov_event() + * + * Turn on reporting of profiling data load/unload-events through the + * gcov_event() callback. Also replay all previous events once. This function + * is needed because some events are potentially generated too early for the + * callback implementation to handle them initially. */ -void __gcov_init(struct gcov_info *info) +void gcov_enable_events(void) { - static unsigned int gcov_version; + struct gcov_info *info = NULL; mutex_lock(&gcov_lock); - if (gcov_version == 0) { - gcov_version = info->version; - /* - * Printing gcc's version magic may prove useful for debugging - * incompatibility reports. - */ - pr_info("version magic: 0x%x\n", gcov_version); - } - /* - * Add new profiling data structure to list and inform event - * listener. - */ - info->next = gcov_info_head; - gcov_info_head = info; - if (gcov_events_enabled) + gcov_events_enabled = 1; + + /* Perform event callback for previously registered entries. */ + while ((info = gcov_info_next(info))) { gcov_event(GCOV_ADD, info); + cond_resched(); + } + mutex_unlock(&gcov_lock); } -EXPORT_SYMBOL(__gcov_init); -/* - * These functions may be referenced by gcc-generated profiling code but serve - * no function for kernel profiling. +/** + * store_gcov_u32 - 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. */ -void __gcov_flush(void) +size_t store_gcov_u32(void *buffer, size_t off, u32 v) { - /* Unused. */ -} -EXPORT_SYMBOL(__gcov_flush); + u32 *data; -void __gcov_merge_add(gcov_type *counters, unsigned int n_counters) -{ - /* Unused. */ -} -EXPORT_SYMBOL(__gcov_merge_add); - -void __gcov_merge_single(gcov_type *counters, unsigned int n_counters) -{ - /* Unused. */ -} -EXPORT_SYMBOL(__gcov_merge_single); + if (buffer) { + data = buffer + off; + *data = v; + } -void __gcov_merge_delta(gcov_type *counters, unsigned int n_counters) -{ - /* Unused. */ + return sizeof(*data); } -EXPORT_SYMBOL(__gcov_merge_delta); /** - * gcov_enable_events - enable event reporting through gcov_event() + * store_gcov_u64 - store 64 bit number in gcov format to buffer + * @buffer: target buffer or NULL + * @off: offset into the buffer + * @v: value to be stored * - * Turn on reporting of profiling data load/unload-events through the - * gcov_event() callback. Also replay all previous events once. This function - * is needed because some events are potentially generated too early for the - * callback implementation to handle them initially. + * 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. */ -void gcov_enable_events(void) +size_t store_gcov_u64(void *buffer, size_t off, u64 v) { - struct gcov_info *info; + u32 *data; - mutex_lock(&gcov_lock); - gcov_events_enabled = 1; - /* Perform event callback for previously registered entries. */ - for (info = gcov_info_head; info; info = info->next) - gcov_event(GCOV_ADD, info); - mutex_unlock(&gcov_lock); -} + if (buffer) { + data = buffer + off; -#ifdef CONFIG_MODULES -static inline int within(void *addr, void *start, unsigned long size) -{ - return ((addr >= start) && (addr < start + size)); + data[0] = (v & 0xffffffffUL); + data[1] = (v >> 32); + } + + return sizeof(*data) * 2; } +#ifdef CONFIG_MODULES /* Update list and generate events when modules are unloaded. */ static int gcov_module_notifier(struct notifier_block *nb, unsigned long event, void *data) { struct module *mod = data; - struct gcov_info *info; - struct gcov_info *prev; + struct gcov_info *info = NULL; + struct gcov_info *prev = NULL; if (event != MODULE_STATE_GOING) return NOTIFY_OK; mutex_lock(&gcov_lock); - prev = NULL; + /* Remove entries located in module from linked list. */ - for (info = gcov_info_head; info; info = info->next) { - if (within(info, mod->module_core, mod->core_size)) { - if (prev) - prev->next = info->next; - else - gcov_info_head = info->next; + while ((info = gcov_info_next(info))) { + if (gcov_info_within_module(info, mod)) { + gcov_info_unlink(prev, info); if (gcov_events_enabled) gcov_event(GCOV_REMOVE, info); } else prev = info; } + mutex_unlock(&gcov_lock); return NOTIFY_OK; diff --git a/kernel/gcov/clang.c b/kernel/gcov/clang.c new file mode 100644 index 000000000000..8b888a6193cc --- /dev/null +++ b/kernel/gcov/clang.c @@ -0,0 +1,393 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 Google, Inc. + * modified from kernel/gcov/gcc_4_7.c + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + * + * + * LLVM uses profiling data that's deliberately similar to GCC, but has a + * very different way of exporting that data. LLVM calls llvm_gcov_init() once + * per module, and provides a couple of callbacks that we can use to ask for + * more data. + * + * We care about the "writeout" callback, which in turn calls back into + * compiler-rt/this module to dump all the gathered coverage data to disk: + * + * llvm_gcda_start_file() + * llvm_gcda_emit_function() + * llvm_gcda_emit_arcs() + * llvm_gcda_emit_function() + * llvm_gcda_emit_arcs() + * [... repeats for each function ...] + * llvm_gcda_summary_info() + * llvm_gcda_end_file() + * + * This design is much more stateless and unstructured than gcc's, and is + * intended to run at process exit. This forces us to keep some local state + * about which module we're dealing with at the moment. On the other hand, it + * also means we don't depend as much on how LLVM represents profiling data + * internally. + * + * See LLVM's lib/Transforms/Instrumentation/GCOVProfiling.cpp for more + * details on how this works, particularly GCOVProfiler::emitProfileArcs(), + * GCOVProfiler::insertCounterWriteout(), and + * GCOVProfiler::insertFlush(). + */ + +#define pr_fmt(fmt) "gcov: " fmt + +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/printk.h> +#include <linux/ratelimit.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include "gcov.h" + +typedef void (*llvm_gcov_callback)(void); + +struct gcov_info { + struct list_head head; + + const char *filename; + unsigned int version; + u32 checksum; + + struct list_head functions; +}; + +struct gcov_fn_info { + struct list_head head; + + u32 ident; + u32 checksum; + u32 cfg_checksum; + + u32 num_counters; + u64 *counters; +}; + +static struct gcov_info *current_info; + +static LIST_HEAD(clang_gcov_list); + +void llvm_gcov_init(llvm_gcov_callback writeout, llvm_gcov_callback flush) +{ + struct gcov_info *info = kzalloc(sizeof(*info), GFP_KERNEL); + + if (!info) + return; + + INIT_LIST_HEAD(&info->head); + INIT_LIST_HEAD(&info->functions); + + mutex_lock(&gcov_lock); + + list_add_tail(&info->head, &clang_gcov_list); + current_info = info; + writeout(); + current_info = NULL; + if (gcov_events_enabled) + gcov_event(GCOV_ADD, info); + + mutex_unlock(&gcov_lock); +} +EXPORT_SYMBOL(llvm_gcov_init); + +void llvm_gcda_start_file(const char *orig_filename, u32 version, u32 checksum) +{ + current_info->filename = orig_filename; + current_info->version = version; + current_info->checksum = checksum; +} +EXPORT_SYMBOL(llvm_gcda_start_file); + +void llvm_gcda_emit_function(u32 ident, u32 func_checksum, u32 cfg_checksum) +{ + struct gcov_fn_info *info = kzalloc(sizeof(*info), GFP_KERNEL); + + if (!info) + return; + + INIT_LIST_HEAD(&info->head); + info->ident = ident; + info->checksum = func_checksum; + info->cfg_checksum = cfg_checksum; + list_add_tail(&info->head, ¤t_info->functions); +} +EXPORT_SYMBOL(llvm_gcda_emit_function); + +void llvm_gcda_emit_arcs(u32 num_counters, u64 *counters) +{ + struct gcov_fn_info *info = list_last_entry(¤t_info->functions, + struct gcov_fn_info, head); + + info->num_counters = num_counters; + info->counters = counters; +} +EXPORT_SYMBOL(llvm_gcda_emit_arcs); + +void llvm_gcda_summary_info(void) +{ +} +EXPORT_SYMBOL(llvm_gcda_summary_info); + +void llvm_gcda_end_file(void) +{ +} +EXPORT_SYMBOL(llvm_gcda_end_file); + +/** + * 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 list_first_entry_or_null(&clang_gcov_list, + struct gcov_info, head); + if (list_is_last(&info->head, &clang_gcov_list)) + return NULL; + return list_next_entry(info, head); +} + +/** + * gcov_info_link - link/add profiling data set to the list + * @info: profiling data set + */ +void gcov_info_link(struct gcov_info *info) +{ + list_add_tail(&info->head, &clang_gcov_list); +} + +/** + * 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) +{ + /* Generic code unlinks while iterating. */ + __list_del_entry(&info->head); +} + +/** + * gcov_info_within_module - check if a profiling data set belongs to a module + * @info: profiling data set + * @mod: module + * + * Returns true if profiling data belongs module, false otherwise. + */ +bool gcov_info_within_module(struct gcov_info *info, struct module *mod) +{ + return within_module((unsigned long)info->filename, mod); +} + +/* 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}, +}; + +/** + * gcov_info_reset - reset profiling data to zero + * @info: profiling data set + */ +void gcov_info_reset(struct gcov_info *info) +{ + struct gcov_fn_info *fn; + + list_for_each_entry(fn, &info->functions, head) + memset(fn->counters, 0, + sizeof(fn->counters[0]) * fn->num_counters); +} + +/** + * 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) +{ + struct gcov_fn_info *fn_ptr1 = list_first_entry_or_null( + &info1->functions, struct gcov_fn_info, head); + struct gcov_fn_info *fn_ptr2 = list_first_entry_or_null( + &info2->functions, struct gcov_fn_info, head); + + if (info1->checksum != info2->checksum) + return false; + if (!fn_ptr1) + return fn_ptr1 == fn_ptr2; + while (!list_is_last(&fn_ptr1->head, &info1->functions) && + !list_is_last(&fn_ptr2->head, &info2->functions)) { + if (fn_ptr1->checksum != fn_ptr2->checksum) + return false; + if (fn_ptr1->cfg_checksum != fn_ptr2->cfg_checksum) + return false; + fn_ptr1 = list_next_entry(fn_ptr1, head); + fn_ptr2 = list_next_entry(fn_ptr2, head); + } + return list_is_last(&fn_ptr1->head, &info1->functions) && + list_is_last(&fn_ptr2->head, &info2->functions); +} + +/** + * gcov_info_add - add up profiling data + * @dst: profiling data set to which data is added + * @src: profiling data set which is added + * + * Adds profiling counts of @src to @dst. + */ +void gcov_info_add(struct gcov_info *dst, struct gcov_info *src) +{ + struct gcov_fn_info *dfn_ptr; + struct gcov_fn_info *sfn_ptr = list_first_entry_or_null(&src->functions, + struct gcov_fn_info, head); + + list_for_each_entry(dfn_ptr, &dst->functions, head) { + u32 i; + + for (i = 0; i < sfn_ptr->num_counters; i++) + dfn_ptr->counters[i] += sfn_ptr->counters[i]; + + sfn_ptr = list_next_entry(sfn_ptr, head); + } +} + +static struct gcov_fn_info *gcov_fn_info_dup(struct gcov_fn_info *fn) +{ + size_t cv_size; /* counter values size */ + struct gcov_fn_info *fn_dup = kmemdup(fn, sizeof(*fn), + GFP_KERNEL); + if (!fn_dup) + return NULL; + INIT_LIST_HEAD(&fn_dup->head); + + cv_size = fn->num_counters * sizeof(fn->counters[0]); + fn_dup->counters = kvmalloc(cv_size, GFP_KERNEL); + if (!fn_dup->counters) { + kfree(fn_dup); + return NULL; + } + + memcpy(fn_dup->counters, fn->counters, cv_size); + + return fn_dup; +} + +/** + * 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_fn_info *fn; + + dup = kmemdup(info, sizeof(*dup), GFP_KERNEL); + if (!dup) + return NULL; + INIT_LIST_HEAD(&dup->head); + INIT_LIST_HEAD(&dup->functions); + dup->filename = kstrdup(info->filename, GFP_KERNEL); + if (!dup->filename) + goto err; + + list_for_each_entry(fn, &info->functions, head) { + struct gcov_fn_info *fn_dup = gcov_fn_info_dup(fn); + + if (!fn_dup) + goto err; + list_add_tail(&fn_dup->head, &dup->functions); + } + + return dup; + +err: + 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) +{ + struct gcov_fn_info *fn, *tmp; + + list_for_each_entry_safe(fn, tmp, &info->functions, head) { + kvfree(fn->counters); + list_del(&fn->head); + kfree(fn); + } + kfree(info->filename); + kfree(info); +} + +/** + * 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. + */ +size_t convert_to_gcda(char *buffer, struct gcov_info *info) +{ + struct gcov_fn_info *fi_ptr; + size_t pos = 0; + + /* File header. */ + pos += store_gcov_u32(buffer, pos, GCOV_DATA_MAGIC); + pos += store_gcov_u32(buffer, pos, info->version); + pos += store_gcov_u32(buffer, pos, info->checksum); + + list_for_each_entry(fi_ptr, &info->functions, head) { + u32 i; + + pos += store_gcov_u32(buffer, pos, GCOV_TAG_FUNCTION); + pos += store_gcov_u32(buffer, pos, 3); + pos += store_gcov_u32(buffer, pos, fi_ptr->ident); + pos += store_gcov_u32(buffer, pos, fi_ptr->checksum); + pos += store_gcov_u32(buffer, pos, fi_ptr->cfg_checksum); + pos += store_gcov_u32(buffer, pos, GCOV_TAG_COUNTER_BASE); + pos += store_gcov_u32(buffer, pos, fi_ptr->num_counters * 2); + for (i = 0; i < fi_ptr->num_counters; i++) + pos += store_gcov_u64(buffer, pos, fi_ptr->counters[i]); + } + + return pos; +} diff --git a/kernel/gcov/fs.c b/kernel/gcov/fs.c index 9bd0934f6c33..01520689b57c 100644 --- a/kernel/gcov/fs.c +++ b/kernel/gcov/fs.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * This code exports profiling data as debugfs files to userspace. * @@ -25,6 +26,7 @@ #include <linux/slab.h> #include <linux/mutex.h> #include <linux/seq_file.h> +#include <linux/mm.h> #include "gcov.h" /** @@ -57,13 +59,12 @@ struct gcov_node { struct dentry *dentry; struct dentry **links; int num_loaded; - char name[0]; + char name[]; }; static const char objtree[] = OBJTREE; static const char srctree[] = SRCTREE; static struct gcov_node root_node; -static struct dentry *reset_dentry; static LIST_HEAD(all_head); static DEFINE_MUTEX(node_lock); @@ -74,8 +75,8 @@ static int __init gcov_persist_setup(char *str) { unsigned long val; - if (strict_strtoul(str, 0, &val)) { - pr_warning("invalid gcov_persist parameter '%s'\n", str); + if (kstrtoul(str, 0, &val)) { + pr_warn("invalid gcov_persist parameter '%s'\n", str); return 0; } gcov_persist = val; @@ -85,6 +86,115 @@ static int __init gcov_persist_setup(char *str) } __setup("gcov_persist=", gcov_persist_setup); +#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; + size_t size; + loff_t pos; + char buffer[] __counted_by(size); +}; + +/** + * gcov_iter_new - allocate and initialize profiling data iterator + * @info: profiling data set to be iterated + * + * Return file iterator on success, %NULL otherwise. + */ +static struct gcov_iterator *gcov_iter_new(struct gcov_info *info) +{ + struct gcov_iterator *iter; + size_t size; + + /* Dry-run to get the actual buffer size. */ + size = convert_to_gcda(NULL, info); + + iter = kvmalloc(struct_size(iter, buffer, size), GFP_KERNEL); + if (!iter) + return NULL; + + iter->info = info; + iter->size = size; + convert_to_gcda(iter->buffer, info); + + return iter; +} + + +/** + * gcov_iter_free - free iterator data + * @iter: file iterator + */ +static void gcov_iter_free(struct gcov_iterator *iter) +{ + kvfree(iter); +} + +/** + * gcov_iter_get_info - return profiling data set for given file iterator + * @iter: file iterator + */ +static 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 + */ +static 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. + */ +static 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. + */ +static int gcov_iter_write(struct gcov_iterator *iter, struct seq_file *seq) +{ + size_t len; + + if (iter->pos >= iter->size) + return -EINVAL; + + len = ITER_STRIDE; + if (iter->pos + len > iter->size) + len = iter->size - iter->pos; + + seq_write(seq, iter->buffer + iter->pos, len); + + return 0; +} + /* * seq_file.start() implementation for gcov data files. Note that the * gcov_iterator interface is designed to be more restrictive than seq_file @@ -108,9 +218,9 @@ static void *gcov_seq_next(struct seq_file *seq, void *data, loff_t *pos) { struct gcov_iterator *iter = data; + (*pos)++; if (gcov_iter_next(iter)) return NULL; - (*pos)++; return iter; } @@ -242,7 +352,7 @@ static struct gcov_node *get_node_by_name(const char *name) list_for_each_entry(node, &all_head, all) { info = get_node_info(node); - if (info && (strcmp(info->filename, name) == 0)) + if (info && (strcmp(gcov_info_filename(info), name) == 0)) return node; } @@ -279,7 +389,7 @@ static ssize_t gcov_seq_write(struct file *file, const char __user *addr, seq = file->private_data; info = gcov_iter_get_info(seq->private); mutex_lock(&node_lock); - node = get_node_by_name(info->filename); + node = get_node_by_name(gcov_info_filename(info)); if (node) { /* Reset counts or remove node for unloaded modules. */ if (node->num_loaded == 0) @@ -365,7 +475,7 @@ static const char *deskew(const char *basename) */ static void add_links(struct gcov_node *node, struct dentry *parent) { - char *basename; + const char *basename; char *target; int num; int i; @@ -376,18 +486,16 @@ static void add_links(struct gcov_node *node, struct dentry *parent) if (!node->links) return; for (i = 0; i < num; i++) { - target = get_link_target(get_node_info(node)->filename, - &gcov_link[i]); + target = get_link_target( + gcov_info_filename(get_node_info(node)), + &gcov_link[i]); if (!target) goto out_err; - basename = strrchr(target, '/'); - if (!basename) + basename = kbasename(target); + if (basename == target) goto out_err; - basename++; node->links[i] = debugfs_create_symlink(deskew(basename), parent, target); - if (!node->links[i]) - goto out_err; kfree(target); } @@ -449,11 +557,6 @@ static struct gcov_node *new_node(struct gcov_node *parent, parent->dentry, node, &gcov_data_fops); } else node->dentry = debugfs_create_dir(node->name, parent->dentry); - if (!node->dentry) { - pr_warning("could not create file\n"); - kfree(node); - return NULL; - } if (info) add_links(node, parent->dentry); list_add(&node->list, &parent->children); @@ -463,7 +566,7 @@ static struct gcov_node *new_node(struct gcov_node *parent, err_nomem: kfree(node); - pr_warning("out of memory\n"); + pr_warn("out of memory\n"); return NULL; } @@ -576,7 +679,7 @@ static void add_node(struct gcov_info *info) struct gcov_node *parent; struct gcov_node *node; - filename = kstrdup(info->filename, GFP_KERNEL); + filename = kstrdup(gcov_info_filename(info), GFP_KERNEL); if (!filename) return; parent = &root_node; @@ -630,8 +733,8 @@ static void add_info(struct gcov_node *node, struct gcov_info *info) */ loaded_info = kcalloc(num + 1, sizeof(struct gcov_info *), GFP_KERNEL); if (!loaded_info) { - pr_warning("could not add '%s' (out of memory)\n", - info->filename); + pr_warn("could not add '%s' (out of memory)\n", + gcov_info_filename(info)); return; } memcpy(loaded_info, node->loaded_info, @@ -644,8 +747,9 @@ static void add_info(struct gcov_node *node, struct gcov_info *info) * data set replaces the copy of the last one. */ if (!gcov_info_is_compatible(node->unloaded_info, info)) { - pr_warning("discarding saved data for %s " - "(incompatible version)\n", info->filename); + pr_warn("discarding saved data for %s " + "(incompatible version)\n", + gcov_info_filename(info)); gcov_info_free(node->unloaded_info); node->unloaded_info = NULL; } @@ -655,8 +759,8 @@ static void add_info(struct gcov_node *node, struct gcov_info *info) * The initial one takes precedence. */ if (!gcov_info_is_compatible(node->loaded_info[0], info)) { - pr_warning("could not add '%s' (incompatible " - "version)\n", info->filename); + pr_warn("could not add '%s' (incompatible " + "version)\n", gcov_info_filename(info)); kfree(loaded_info); return; } @@ -691,8 +795,9 @@ static void save_info(struct gcov_node *node, struct gcov_info *info) else { node->unloaded_info = gcov_info_dup(info); if (!node->unloaded_info) { - pr_warning("could not save data for '%s' " - "(out of memory)\n", info->filename); + pr_warn("could not save data for '%s' " + "(out of memory)\n", + gcov_info_filename(info)); } } } @@ -707,8 +812,8 @@ static void remove_info(struct gcov_node *node, struct gcov_info *info) i = get_info_index(node, info); if (i < 0) { - pr_warning("could not remove '%s' (not found)\n", - info->filename); + pr_warn("could not remove '%s' (not found)\n", + gcov_info_filename(info)); return; } if (gcov_persist) @@ -735,7 +840,7 @@ void gcov_event(enum gcov_action action, struct gcov_info *info) struct gcov_node *node; mutex_lock(&node_lock); - node = get_node_by_name(info->filename); + node = get_node_by_name(gcov_info_filename(info)); switch (action) { case GCOV_ADD: if (node) @@ -747,8 +852,8 @@ void gcov_event(enum gcov_action action, struct gcov_info *info) if (node) remove_info(node, info); else { - pr_warning("could not remove '%s' (not found)\n", - info->filename); + pr_warn("could not remove '%s' (not found)\n", + gcov_info_filename(info)); } break; } @@ -758,33 +863,20 @@ void gcov_event(enum gcov_action action, struct gcov_info *info) /* Create debugfs entries. */ static __init int gcov_fs_init(void) { - int rc = -EIO; - init_node(&root_node, NULL, NULL, NULL); /* * /sys/kernel/debug/gcov will be parent for the reset control file * and all profiling files. */ root_node.dentry = debugfs_create_dir("gcov", NULL); - if (!root_node.dentry) - goto err_remove; /* * Create reset file which resets all profiling counts when written * to. */ - reset_dentry = debugfs_create_file("reset", 0600, root_node.dentry, - NULL, &gcov_reset_fops); - if (!reset_dentry) - goto err_remove; + debugfs_create_file("reset", 0600, root_node.dentry, NULL, + &gcov_reset_fops); /* Replay previous events to get our fs hierarchy up-to-date. */ gcov_enable_events(); return 0; - -err_remove: - pr_err("init failed\n"); - if (root_node.dentry) - debugfs_remove(root_node.dentry); - - return rc; } device_initcall(gcov_fs_init); diff --git a/kernel/gcov/gcc_3_4.c b/kernel/gcov/gcc_3_4.c deleted file mode 100644 index ae5bb4260033..000000000000 --- a/kernel/gcov/gcc_3_4.c +++ /dev/null @@ -1,447 +0,0 @@ -/* - * 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" - -/* 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; -} diff --git a/kernel/gcov/gcc_4_7.c b/kernel/gcov/gcc_4_7.c new file mode 100644 index 000000000000..ffde93d051a4 --- /dev/null +++ b/kernel/gcov/gcc_4_7.c @@ -0,0 +1,436 @@ +// SPDX-License-Identifier: 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 <linux/errno.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/mm.h> +#include "gcov.h" + +#if (__GNUC__ >= 15) +#define GCOV_COUNTERS 10 +#elif (__GNUC__ >= 14) +#define GCOV_COUNTERS 9 +#elif (__GNUC__ >= 10) +#define GCOV_COUNTERS 8 +#else +#define GCOV_COUNTERS 9 +#endif + +#define GCOV_TAG_FUNCTION_LENGTH 3 + +/* Since GCC 12.1 sizes are in BYTES and not in WORDS (4B). */ +#if (__GNUC__ >= 12) +#define GCOV_UNIT_SIZE 4 +#else +#define GCOV_UNIT_SIZE 1 +#endif + +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[]; +}; + +/** + * 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 + * @checksum: unique object checksum + * @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; + /* Since GCC 12.1 a checksum field is added. */ +#if (__GNUC__ >= 12) + unsigned int checksum; +#endif + 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; +} + +/** + * gcov_info_within_module - check if a profiling data set belongs to a module + * @info: profiling data set + * @mod: module + * + * Returns true if profiling data belongs module, false otherwise. + */ +bool gcov_info_within_module(struct gcov_info *info, struct module *mod) +{ + return within_module((unsigned long)info, mod); +} + +/* 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 + * @dst: profiling data set to which data is added + * @src: profiling data set which is added + * + * Adds profiling counts of @src to @dst. + */ +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 */ + + dup = kmemdup(info, sizeof(*dup), GFP_KERNEL); + if (!dup) + return NULL; + + dup->next = NULL; + dup->filename = NULL; + dup->functions = NULL; + + dup->filename = kstrdup(info->filename, GFP_KERNEL); + if (!dup->filename) + goto err_free; + + dup->functions = kcalloc(info->n_functions, + sizeof(struct gcov_fn_info *), GFP_KERNEL); + if (!dup->functions) + 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] = kzalloc(fi_size, GFP_KERNEL); + 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 = kvmalloc(cv_size, GFP_KERNEL); + + 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++) + kvfree(ci_ptr->values); + + kfree(info->functions[fi_idx]); + } + +free_info: + kfree(info->functions); + kfree(info->filename); + kfree(info); +} + +/** + * 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. + */ +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_u32(buffer, pos, GCOV_DATA_MAGIC); + pos += store_gcov_u32(buffer, pos, info->version); + pos += store_gcov_u32(buffer, pos, info->stamp); + +#if (__GNUC__ >= 12) + /* Use zero as checksum of the compilation unit. */ + pos += store_gcov_u32(buffer, pos, 0); +#endif + + for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) { + fi_ptr = info->functions[fi_idx]; + + /* Function record. */ + pos += store_gcov_u32(buffer, pos, GCOV_TAG_FUNCTION); + pos += store_gcov_u32(buffer, pos, + GCOV_TAG_FUNCTION_LENGTH * GCOV_UNIT_SIZE); + pos += store_gcov_u32(buffer, pos, fi_ptr->ident); + pos += store_gcov_u32(buffer, pos, fi_ptr->lineno_checksum); + pos += store_gcov_u32(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_u32(buffer, pos, + GCOV_TAG_FOR_COUNTER(ct_idx)); + pos += store_gcov_u32(buffer, pos, + ci_ptr->num * 2 * GCOV_UNIT_SIZE); + + for (cv_idx = 0; cv_idx < ci_ptr->num; cv_idx++) { + pos += store_gcov_u64(buffer, pos, + ci_ptr->values[cv_idx]); + } + + ci_ptr++; + } + } + + return pos; +} diff --git a/kernel/gcov/gcc_base.c b/kernel/gcov/gcc_base.c new file mode 100644 index 000000000000..3cf736b9f880 --- /dev/null +++ b/kernel/gcov/gcc_base.c @@ -0,0 +1,86 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/export.h> +#include <linux/kernel.h> +#include <linux/mutex.h> +#include "gcov.h" + +/* + * __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; + + mutex_lock(&gcov_lock); + if (gcov_version == 0) { + gcov_version = gcov_info_version(info); + /* + * Printing gcc's version magic may prove useful for debugging + * incompatibility reports. + */ + pr_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); + mutex_unlock(&gcov_lock); +} +EXPORT_SYMBOL(__gcov_init); + +/* + * These functions may be referenced by gcc-generated profiling code but serve + * no function for kernel profiling. + */ +void __gcov_flush(void) +{ + /* Unused. */ +} +EXPORT_SYMBOL(__gcov_flush); + +void __gcov_merge_add(gcov_type *counters, unsigned int n_counters) +{ + /* Unused. */ +} +EXPORT_SYMBOL(__gcov_merge_add); + +void __gcov_merge_single(gcov_type *counters, unsigned int n_counters) +{ + /* Unused. */ +} +EXPORT_SYMBOL(__gcov_merge_single); + +void __gcov_merge_delta(gcov_type *counters, unsigned int n_counters) +{ + /* Unused. */ +} +EXPORT_SYMBOL(__gcov_merge_delta); + +void __gcov_merge_ior(gcov_type *counters, unsigned int n_counters) +{ + /* Unused. */ +} +EXPORT_SYMBOL(__gcov_merge_ior); + +void __gcov_merge_time_profile(gcov_type *counters, unsigned int n_counters) +{ + /* Unused. */ +} +EXPORT_SYMBOL(__gcov_merge_time_profile); + +void __gcov_merge_icall_topn(gcov_type *counters, unsigned int n_counters) +{ + /* Unused. */ +} +EXPORT_SYMBOL(__gcov_merge_icall_topn); + +void __gcov_exit(void) +{ + /* Unused. */ +} +EXPORT_SYMBOL(__gcov_exit); diff --git a/kernel/gcov/gcov.h b/kernel/gcov/gcov.h index 060073ebf7a6..912b8ea01d33 100644 --- a/kernel/gcov/gcov.h +++ b/kernel/gcov/gcov.h @@ -1,3 +1,4 @@ +/* SPDX-License-Identifier: GPL-2.0 */ /* * Profiling infrastructure declarations. * @@ -14,6 +15,7 @@ #ifndef GCOV_H #define GCOV_H GCOV_H +#include <linux/module.h> #include <linux/types.h> /* @@ -21,7 +23,6 @@ * gcc and need to be kept as close to the original definition as possible to * remain compatible. */ -#define GCOV_COUNTERS 5 #define GCOV_DATA_MAGIC ((unsigned int) 0x67636461) #define GCOV_TAG_FUNCTION ((unsigned int) 0x01000000) #define GCOV_TAG_COUNTER_BASE ((unsigned int) 0x01a10000) @@ -34,60 +35,20 @@ typedef long gcov_type; typedef long long gcov_type; #endif -/** - * 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); -}; +/* 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; -/** - * 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]; -}; +/* 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); +bool gcov_info_within_module(struct gcov_info *info, struct module *mod); +size_t convert_to_gcda(char *buffer, struct gcov_info *info); /* Base interface. */ enum gcov_action { @@ -98,16 +59,9 @@ enum gcov_action { void gcov_event(enum gcov_action action, struct gcov_info *info); void gcov_enable_events(void); -/* Iterator control. */ -struct seq_file; -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 seq_file *seq); -struct gcov_info *gcov_iter_get_info(struct gcov_iterator *iter); +/* writing helpers */ +size_t store_gcov_u32(void *buffer, size_t off, u32 v); +size_t store_gcov_u64(void *buffer, size_t off, u64 v); /* gcov_info control. */ void gcov_info_reset(struct gcov_info *info); @@ -125,4 +79,7 @@ struct gcov_link { }; extern const struct gcov_link gcov_link[]; +extern int gcov_events_enabled; +extern struct mutex gcov_lock; + #endif /* GCOV_H */ |