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Commit 43750880 authored by Chris Smart's avatar Chris Smart Committed by Michael Ellerman
Browse files

selftests/powerpc: Test unaligned copy and paste 



Test that an ISA 3.0 compliant machine performing an unaligned copy,
copy_first, paste or paste_last is sent a SIGBUS.

Signed-off-by: default avatarChris Smart <chris@distroguy.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent ae26b36f

tools/testing/selftests/powerpc/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -12,7 +12,8 @@ CFLAGS := -Wall -O2 -Wall -Werror -DGIT_VERSION='"$(GIT_VERSION)"' -I$(CURDIR) $ 


export CFLAGS



SUB_DIRS = benchmarks 		\

SUB_DIRS = alignment		\

	   benchmarks		\

	   copyloops		\

	   context_switch	\

	   dscr			\

tools/testing/selftests/powerpc/alignment/.gitignore

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copy_unaligned

copy_first_unaligned

paste_unaligned

paste_last_unaligned

copy_paste_unaligned_common

tools/testing/selftests/powerpc/alignment/Makefile

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TEST_PROGS := copy_unaligned copy_first_unaligned paste_unaligned paste_last_unaligned



all: $(TEST_PROGS)



$(TEST_PROGS): ../harness.c ../utils.c copy_paste_unaligned_common.c



include ../../lib.mk



clean:

	rm -f $(TEST_PROGS)

tools/testing/selftests/powerpc/alignment/copy_first_unaligned.c

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/*

 * Copyright 2016, Chris Smart, IBM Corporation.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 *

 * Calls to copy_first which are not 128-byte aligned should be

 * caught and sent a SIGBUS.

 *

 */



#include <string.h>

#include <unistd.h>

#include "utils.h"

#include "instructions.h"

#include "copy_paste_unaligned_common.h"



unsigned int expected_instruction = PPC_INST_COPY_FIRST;

unsigned int instruction_mask = 0xfc2007fe;



int test_copy_first_unaligned(void)

{

	/* Only run this test on a P9 or later */

	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_00));



	/* Register our signal handler with SIGBUS */

	setup_signal_handler();



	/* +1 makes buf unaligned */

	copy_first(cacheline_buf+1);



	/* We should not get here */

	return 1;

}



int main(int argc, char *argv[])

{

	return test_harness(test_copy_first_unaligned, "test_copy_first_unaligned");

}

tools/testing/selftests/powerpc/alignment/copy_paste_unaligned_common.c

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/*

 * Copyright 2016, Chris Smart, IBM Corporation.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 *

 * Common code for copy, copy_first, paste and paste_last unaligned

 * tests.

 *

 */



#include <signal.h>

#include <string.h>

#include <unistd.h>

#include "utils.h"

#include "instructions.h"

#include "copy_paste_unaligned_common.h"



unsigned int expected_instruction;

unsigned int instruction_mask;



char cacheline_buf[128] __cacheline_aligned;



void signal_action_handler(int signal_num, siginfo_t *info, void *ptr)

{

	ucontext_t *ctx = ptr;

#if defined(__powerpc64__)

	unsigned int *pc = (unsigned int *)ctx->uc_mcontext.gp_regs[PT_NIP];

#else

	unsigned int *pc = (unsigned int *)ctx->uc_mcontext.uc_regs->gregs[PT_NIP];

#endif



	/*

	 * Check that the signal was on the correct instruction, using a

	 * mask because the compiler assigns the register at RB.

	 */

	if ((*pc & instruction_mask) == expected_instruction)

		_exit(0); /* We hit the right instruction */



	_exit(1);

}



void setup_signal_handler(void)

{

	struct sigaction signal_action;



	memset(&signal_action, 0, sizeof(signal_action));

	signal_action.sa_sigaction = signal_action_handler;

	signal_action.sa_flags = SA_SIGINFO;

	sigaction(SIGBUS, &signal_action, NULL);

}