5426539c71
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
170 lines
4.2 KiB
C
170 lines
4.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2019, Matthew Macy <mmacy@freebsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <sys/param.h>
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#include <sys/sbuf.h>
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#include <sys/queue.h>
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#include <sys/linker.h>
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#include <sys/module.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/syslog.h>
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#include <sys/proc.h>
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#include <sys/sched.h>
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#include <sys/syslog.h>
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#include <sys/sysctl.h>
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#include <gnu/gcov/gcov.h>
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#include <sys/queue.h>
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#include "linker_if.h"
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static void gcov_invoke_ctors(void);
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static int gcov_ctors_done;
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int gcov_events_enabled;
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static int
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gcov_stats_reset_sysctl(SYSCTL_HANDLER_ARGS)
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{
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int error, v;
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v = 0;
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error = sysctl_handle_int(oidp, &v, 0, req);
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if (error)
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return (error);
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if (req->newptr == NULL)
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return (error);
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if (v == 0)
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return (0);
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gcov_stats_reset();
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return (0);
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}
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static int
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gcov_stats_enable_sysctl(SYSCTL_HANDLER_ARGS)
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{
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int error, v;
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v = gcov_events_enabled;
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error = sysctl_handle_int(oidp, &v, v, req);
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if (error)
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return (error);
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if (req->newptr == NULL)
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return (error);
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if (v == gcov_events_enabled)
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return (0);
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//gcov_events_reset();
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gcov_events_enabled = !!v;
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if (!gcov_ctors_done)
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gcov_invoke_ctors();
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if (gcov_events_enabled)
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gcov_enable_events();
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return (0);
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}
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int
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within_module(vm_offset_t addr, module_t mod)
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{
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linker_file_t link_info;
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vm_offset_t mod_addr;
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size_t mod_size;
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link_info = module_file(mod);
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mod_addr = (vm_offset_t)link_info->address;
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mod_size = link_info->size;
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if (addr >= mod_addr && addr < mod_addr + mod_size)
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return (1);
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return (0);
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}
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#define GCOV_PREFIX "_GLOBAL__sub_I_65535_0_"
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static int
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gcov_invoke_ctor(const char *name, void *arg)
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{
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void (*ctor)(void);
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c_linker_sym_t sym;
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linker_symval_t symval;
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linker_file_t lf;
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if (strstr(name, GCOV_PREFIX) == NULL)
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return (0);
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lf = arg;
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LINKER_LOOKUP_SYMBOL(lf, name, &sym);
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LINKER_SYMBOL_VALUES(lf, sym, &symval);
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ctor = (void *)symval.value;
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ctor();
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return (0);
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}
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static int
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gcov_invoke_lf_ctors(linker_file_t lf, void *arg __unused)
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{
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printf("%s processing file: %s\n", __func__, lf->filename);
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LINKER_EACH_FUNCTION_NAME(lf, gcov_invoke_ctor, lf);
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return (0);
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}
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static void
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gcov_invoke_ctors(void)
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{
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gcov_fs_init();
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linker_file_foreach(gcov_invoke_lf_ctors, NULL);
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gcov_ctors_done = 1;
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}
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static int
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gcov_init(void *arg __unused)
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{
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EVENTHANDLER_REGISTER(module_unload, gcov_module_unload, NULL, 0);
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gcov_enable_events();
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return (0);
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}
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SYSINIT(gcov_init, SI_SUB_EVENTHANDLER, SI_ORDER_ANY, gcov_init, NULL);
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static SYSCTL_NODE(_debug, OID_AUTO, gcov, CTLFLAG_RD, NULL,
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"gcov code coverage");
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SYSCTL_PROC(_debug_gcov, OID_AUTO, reset, CTLTYPE_INT | CTLFLAG_RW,
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NULL, 0, gcov_stats_reset_sysctl, "I", "Reset all profiling counts");
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SYSCTL_PROC(_debug_gcov, OID_AUTO, enable, CTLTYPE_INT | CTLFLAG_RW,
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NULL, 0, gcov_stats_enable_sysctl, "I", "Enable code coverage");
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