524553f56d
This will allow multiple consumers of the coverage data to be compiled into the kernel together. The only requirement is only one can be registered at a given point in time, however it is expected they will only register when the coverage data is needed. A new kernel conflig option COVERAGE is added. This will allow kcov to become a module that can be loaded as needed, or compiled into the kernel. While here clean up the #include style a little. Reviewed by: kib Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D18955
238 lines
6.3 KiB
C
238 lines
6.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 2018 The FreeBSD Foundation. All rights reserved.
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* Copyright (C) 2018, 2019 Andrew Turner
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*
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* This software was developed by Mitchell Horne under sponsorship of
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* the FreeBSD Foundation.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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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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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/coverage.h>
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#include <machine/atomic.h>
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void __sanitizer_cov_trace_pc(void);
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void __sanitizer_cov_trace_cmp1(uint8_t, uint8_t);
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void __sanitizer_cov_trace_cmp2(uint16_t, uint16_t);
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void __sanitizer_cov_trace_cmp4(uint32_t, uint32_t);
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void __sanitizer_cov_trace_cmp8(uint64_t, uint64_t);
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void __sanitizer_cov_trace_const_cmp1(uint8_t, uint8_t);
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void __sanitizer_cov_trace_const_cmp2(uint16_t, uint16_t);
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void __sanitizer_cov_trace_const_cmp4(uint32_t, uint32_t);
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void __sanitizer_cov_trace_const_cmp8(uint64_t, uint64_t);
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void __sanitizer_cov_trace_switch(uint64_t, uint64_t *);
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static cov_trace_pc_t cov_trace_pc;
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static cov_trace_cmp_t cov_trace_cmp;
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void
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cov_register_pc(cov_trace_pc_t trace_pc)
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{
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atomic_store_ptr(&cov_trace_pc, trace_pc);
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}
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void
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cov_unregister_pc(void)
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{
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atomic_store_ptr(&cov_trace_pc, NULL);
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}
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void
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cov_register_cmp(cov_trace_cmp_t trace_cmp)
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{
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atomic_store_ptr(&cov_trace_cmp, trace_cmp);
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}
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void
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cov_unregister_cmp(void)
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{
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atomic_store_ptr(&cov_trace_cmp, NULL);
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}
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/*
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* Main entry point. A call to this function will be inserted
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* at every edge, and if coverage is enabled for the thread
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* this function will add the PC to the buffer.
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*/
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void
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__sanitizer_cov_trace_pc(void)
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{
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cov_trace_pc_t trace_pc;
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trace_pc = (cov_trace_pc_t)atomic_load_ptr(&cov_trace_pc);
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if (trace_pc != NULL)
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trace_pc((uint64_t)__builtin_return_address(0));
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}
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/*
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* Comparison entry points. When the kernel performs a comparison
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* operation the compiler inserts a call to one of the following
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* functions to record the operation.
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*/
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void
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__sanitizer_cov_trace_cmp1(uint8_t arg1, uint8_t arg2)
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{
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cov_trace_cmp_t trace_cmp;
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trace_cmp = (cov_trace_cmp_t)atomic_load_ptr(&cov_trace_cmp);
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if (trace_cmp != NULL)
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trace_cmp(COV_CMP_SIZE(0), arg1, arg2,
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(uint64_t)__builtin_return_address(0));
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}
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void
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__sanitizer_cov_trace_cmp2(uint16_t arg1, uint16_t arg2)
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{
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cov_trace_cmp_t trace_cmp;
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trace_cmp = (cov_trace_cmp_t)atomic_load_ptr(&cov_trace_cmp);
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if (trace_cmp != NULL)
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trace_cmp(COV_CMP_SIZE(1), arg1, arg2,
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(uint64_t)__builtin_return_address(0));
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}
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void
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__sanitizer_cov_trace_cmp4(uint32_t arg1, uint32_t arg2)
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{
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cov_trace_cmp_t trace_cmp;
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trace_cmp = (cov_trace_cmp_t)atomic_load_ptr(&cov_trace_cmp);
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if (trace_cmp != NULL)
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trace_cmp(COV_CMP_SIZE(2), arg1, arg2,
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(uint64_t)__builtin_return_address(0));
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}
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void
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__sanitizer_cov_trace_cmp8(uint64_t arg1, uint64_t arg2)
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{
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cov_trace_cmp_t trace_cmp;
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trace_cmp = (cov_trace_cmp_t)atomic_load_ptr(&cov_trace_cmp);
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if (trace_cmp != NULL)
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trace_cmp(COV_CMP_SIZE(3), arg1, arg2,
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(uint64_t)__builtin_return_address(0));
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}
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void
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__sanitizer_cov_trace_const_cmp1(uint8_t arg1, uint8_t arg2)
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{
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cov_trace_cmp_t trace_cmp;
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trace_cmp = (cov_trace_cmp_t)atomic_load_ptr(&cov_trace_cmp);
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if (trace_cmp != NULL)
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trace_cmp(COV_CMP_SIZE(0) | COV_CMP_CONST, arg1, arg2,
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(uint64_t)__builtin_return_address(0));
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}
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void
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__sanitizer_cov_trace_const_cmp2(uint16_t arg1, uint16_t arg2)
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{
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cov_trace_cmp_t trace_cmp;
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trace_cmp = (cov_trace_cmp_t)atomic_load_ptr(&cov_trace_cmp);
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if (trace_cmp != NULL)
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trace_cmp(COV_CMP_SIZE(1) | COV_CMP_CONST, arg1, arg2,
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(uint64_t)__builtin_return_address(0));
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}
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void
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__sanitizer_cov_trace_const_cmp4(uint32_t arg1, uint32_t arg2)
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{
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cov_trace_cmp_t trace_cmp;
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trace_cmp = (cov_trace_cmp_t)atomic_load_ptr(&cov_trace_cmp);
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if (trace_cmp != NULL)
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trace_cmp(COV_CMP_SIZE(2) | COV_CMP_CONST, arg1, arg2,
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(uint64_t)__builtin_return_address(0));
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}
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void
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__sanitizer_cov_trace_const_cmp8(uint64_t arg1, uint64_t arg2)
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{
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cov_trace_cmp_t trace_cmp;
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trace_cmp = (cov_trace_cmp_t)atomic_load_ptr(&cov_trace_cmp);
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if (trace_cmp != NULL)
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trace_cmp(COV_CMP_SIZE(3) | COV_CMP_CONST, arg1, arg2,
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(uint64_t)__builtin_return_address(0));
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}
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/*
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* val is the switch operand
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* cases[0] is the number of case constants
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* cases[1] is the size of val in bits
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* cases[2..n] are the case constants
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*/
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void
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__sanitizer_cov_trace_switch(uint64_t val, uint64_t *cases)
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{
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uint64_t i, count, ret, type;
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cov_trace_cmp_t trace_cmp;
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trace_cmp = (cov_trace_cmp_t)atomic_load_ptr(&cov_trace_cmp);
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if (trace_cmp == NULL)
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return;
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count = cases[0];
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ret = (uint64_t)__builtin_return_address(0);
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switch (cases[1]) {
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case 8:
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type = COV_CMP_SIZE(0);
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break;
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case 16:
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type = COV_CMP_SIZE(1);
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break;
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case 32:
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type = COV_CMP_SIZE(2);
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break;
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case 64:
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type = COV_CMP_SIZE(3);
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break;
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default:
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return;
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}
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val |= COV_CMP_CONST;
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for (i = 0; i < count; i++)
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if (!trace_cmp(type, val, cases[i + 2], ret))
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return;
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}
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