freebsd-dev/sys/gnu/gcov/gcov_subr.c
Matt Macy 5426539c71 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
2019-02-23 21:14:00 +00:00

170 lines
4.2 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2019, Matthew Macy <mmacy@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.
*
*/
#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 <gnu/gcov/gcov.h>
#include <sys/queue.h>
#include "linker_if.h"
static void gcov_invoke_ctors(void);
static int gcov_ctors_done;
int gcov_events_enabled;
static int
gcov_stats_reset_sysctl(SYSCTL_HANDLER_ARGS)
{
int error, v;
v = 0;
error = sysctl_handle_int(oidp, &v, 0, req);
if (error)
return (error);
if (req->newptr == NULL)
return (error);
if (v == 0)
return (0);
gcov_stats_reset();
return (0);
}
static int
gcov_stats_enable_sysctl(SYSCTL_HANDLER_ARGS)
{
int error, v;
v = gcov_events_enabled;
error = sysctl_handle_int(oidp, &v, v, req);
if (error)
return (error);
if (req->newptr == NULL)
return (error);
if (v == gcov_events_enabled)
return (0);
//gcov_events_reset();
gcov_events_enabled = !!v;
if (!gcov_ctors_done)
gcov_invoke_ctors();
if (gcov_events_enabled)
gcov_enable_events();
return (0);
}
int
within_module(vm_offset_t addr, module_t mod)
{
linker_file_t link_info;
vm_offset_t mod_addr;
size_t mod_size;
link_info = module_file(mod);
mod_addr = (vm_offset_t)link_info->address;
mod_size = link_info->size;
if (addr >= mod_addr && addr < mod_addr + mod_size)
return (1);
return (0);
}
#define GCOV_PREFIX "_GLOBAL__sub_I_65535_0_"
static int
gcov_invoke_ctor(const char *name, void *arg)
{
void (*ctor)(void);
c_linker_sym_t sym;
linker_symval_t symval;
linker_file_t lf;
if (strstr(name, GCOV_PREFIX) == NULL)
return (0);
lf = arg;
LINKER_LOOKUP_SYMBOL(lf, name, &sym);
LINKER_SYMBOL_VALUES(lf, sym, &symval);
ctor = (void *)symval.value;
ctor();
return (0);
}
static int
gcov_invoke_lf_ctors(linker_file_t lf, void *arg __unused)
{
printf("%s processing file: %s\n", __func__, lf->filename);
LINKER_EACH_FUNCTION_NAME(lf, gcov_invoke_ctor, lf);
return (0);
}
static void
gcov_invoke_ctors(void)
{
gcov_fs_init();
linker_file_foreach(gcov_invoke_lf_ctors, NULL);
gcov_ctors_done = 1;
}
static int
gcov_init(void *arg __unused)
{
EVENTHANDLER_REGISTER(module_unload, gcov_module_unload, NULL, 0);
gcov_enable_events();
return (0);
}
SYSINIT(gcov_init, SI_SUB_EVENTHANDLER, SI_ORDER_ANY, gcov_init, NULL);
static SYSCTL_NODE(_debug, OID_AUTO, gcov, CTLFLAG_RD, NULL,
"gcov code coverage");
SYSCTL_PROC(_debug_gcov, OID_AUTO, reset, CTLTYPE_INT | CTLFLAG_RW,
NULL, 0, gcov_stats_reset_sysctl, "I", "Reset all profiling counts");
SYSCTL_PROC(_debug_gcov, OID_AUTO, enable, CTLTYPE_INT | CTLFLAG_RW,
NULL, 0, gcov_stats_enable_sysctl, "I", "Enable code coverage");