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selftests/powerpc: Test unaligned copy and paste

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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: Chris Smart <chris@distroguy.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Chris Smart 2016-06-17 09:34:47 +10:00 committed by Michael Ellerman
parent ae26b36f80
commit 4375088072
10 changed files with 332 additions and 1 deletions
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3
tools/testing/selftests/powerpc/Makefile
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@ -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 \

5
tools/testing/selftests/powerpc/alignment/.gitignore vendored Normal file
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@ -0,0 +1,5 @@
copy_unaligned
copy_first_unaligned
paste_unaligned
paste_last_unaligned
copy_paste_unaligned_common

10
tools/testing/selftests/powerpc/alignment/Makefile Normal file
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@ -0,0 +1,10 @@
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)

41
tools/testing/selftests/powerpc/alignment/copy_first_unaligned.c Normal file
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@ -0,0 +1,41 @@
/*
* 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");
}

53
tools/testing/selftests/powerpc/alignment/copy_paste_unaligned_common.c Normal file
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@ -0,0 +1,53 @@
/*
* 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);
}

26
tools/testing/selftests/powerpc/alignment/copy_paste_unaligned_common.h Normal file
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@ -0,0 +1,26 @@
/*
* 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.
*
* Declarations for common code for copy, copy_first, paste and
* paste_last unaligned tests.
*
*/
#ifndef _SELFTESTS_POWERPC_COPY_PASTE_H
#define _SELFTESTS_POWERPC_COPY_PASTE_H
#include <signal.h>
int main(int argc, char *argv[]);
void signal_action_handler(int signal_num, siginfo_t *info, void *ptr);
void setup_signal_handler(void);
extern char cacheline_buf[128] __cacheline_aligned;
extern unsigned int expected_instruction;
extern unsigned int instruction_mask;
#endif /* _SELFTESTS_POWERPC_COPY_PASTE_H */

41
tools/testing/selftests/powerpc/alignment/copy_unaligned.c Normal file
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@ -0,0 +1,41 @@
/*
* 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 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;
unsigned int instruction_mask = 0xfc0007fe;
int test_copy_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(cacheline_buf+1);
/* We should not get here */
return 1;
}
int main(int argc, char *argv[])
{
return test_harness(test_copy_unaligned, "test_copy_unaligned");
}

43
tools/testing/selftests/powerpc/alignment/paste_last_unaligned.c Normal file
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@ -0,0 +1,43 @@
/*
* 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 paste_last 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_PASTE_LAST;
unsigned int instruction_mask = 0xfc2007ff;
int test_paste_last_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();
copy(cacheline_buf);
/* +1 makes buf unaligned */
paste_last(cacheline_buf+1);
/* We should not get here */
return 1;
}
int main(int argc, char *argv[])
{
return test_harness(test_paste_last_unaligned, "test_paste_last_unaligned");
}

43
tools/testing/selftests/powerpc/alignment/paste_unaligned.c Normal file
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@ -0,0 +1,43 @@
/*
* 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 paste 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_PASTE;
unsigned int instruction_mask = 0xfc0007fe;
int test_paste_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();
copy(cacheline_buf);
/* +1 makes buf unaligned */
paste(cacheline_buf+1);
/* We should not get here */
return 1;
}
int main(int argc, char *argv[])
{
return test_harness(test_paste_unaligned, "test_paste_unaligned");
}

68
tools/testing/selftests/powerpc/instructions.h Normal file
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@ -0,0 +1,68 @@
#ifndef _SELFTESTS_POWERPC_INSTRUCTIONS_H
#define _SELFTESTS_POWERPC_INSTRUCTIONS_H
#include <stdio.h>
#include <stdlib.h>
/* This defines the "copy" instruction from Power ISA 3.0 Book II, section 4.4. */
#define __COPY(RA, RB, L) \
(0x7c00060c | (RA) << (31-15) | (RB) << (31-20) | (L) << (31-10))
#define COPY(RA, RB, L) \
.long __COPY((RA), (RB), (L))
static inline void copy(void *i)
{
asm volatile(str(COPY(0, %0, 0))";"
:
: "b" (i)
: "memory"
);
}
static inline void copy_first(void *i)
{
asm volatile(str(COPY(0, %0, 1))";"
:
: "b" (i)
: "memory"
);
}
/* This defines the "paste" instruction from Power ISA 3.0 Book II, section 4.4. */
#define __PASTE(RA, RB, L, RC) \
(0x7c00070c | (RA) << (31-15) | (RB) << (31-20) | (L) << (31-10) | (RC) << (31-31))
#define PASTE(RA, RB, L, RC) \
.long __PASTE((RA), (RB), (L), (RC))
static inline int paste(void *i)
{
int cr;
asm volatile(str(PASTE(0, %1, 0, 0))";"
"mfcr %0;"
: "=r" (cr)
: "b" (i)
: "memory"
);
return cr;
}
static inline int paste_last(void *i)
{
int cr;
asm volatile(str(PASTE(0, %1, 1, 1))";"
"mfcr %0;"
: "=r" (cr)
: "b" (i)
: "memory"
);
return cr;
}
#define PPC_INST_COPY __COPY(0, 0, 0)
#define PPC_INST_COPY_FIRST __COPY(0, 0, 1)
#define PPC_INST_PASTE __PASTE(0, 0, 0, 0)
#define PPC_INST_PASTE_LAST __PASTE(0, 0, 1, 1)
#endif /* _SELFTESTS_POWERPC_INSTRUCTIONS_H */