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Commit a431b946 authored by Cyril Bur's avatar Cyril Bur Committed by Michael Ellerman
Browse files

selftests/powerpc: exec() with suspended transaction 



Perform an exec() class syscall with a suspended transaction.

This is a test for the bug we fixed in 8e96a87c ("powerpc/tm: Always
reclaim in start_thread() for exec() class syscalls").

Signed-off-by: default avatarCyril Bur <cyrilbur@gmail.com>
[mpe: Fix build errors, use a single binary for the test]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent dd570237

tools/testing/selftests/powerpc/tm/.gitignore

+1 −0
Original line number Diff line number Diff line
@@ -6,3 +6,4 @@ tm-vmxcopy 
tm-fork

tm-tar

tm-tmspr

tm-exec

tools/testing/selftests/powerpc/tm/Makefile

+5 −2
Original line number Diff line number Diff line 
TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack tm-vmxcopy tm-fork tm-tar tm-tmspr

TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack \

	tm-vmxcopy tm-fork tm-tar tm-tmspr tm-exec tm-execed



all: $(TEST_PROGS)



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



CFLAGS += -mhtm



tm-syscall: tm-syscall-asm.S

tm-syscall: CFLAGS += -mhtm -I../../../../../usr/include

tm-syscall: CFLAGS += -I../../../../../usr/include

tm-tmspr: CFLAGS += -pthread



include ../../lib.mk

tools/testing/selftests/powerpc/tm/tm-exec.c

0 → 100644
+70 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2016, Cyril Bur, IBM Corp.

 *

 * 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.

 *

 * Syscalls can be performed provided the transactions are suspended.

 * The exec() class of syscall is unique as a new process is loaded.

 *

 * It makes little sense for after an exec() call for the previously

 * suspended transaction to still exist.

 */



#define _GNU_SOURCE

#include <errno.h>

#include <inttypes.h>

#include <libgen.h>

#include <pthread.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>



#include "utils.h"

#include "tm.h"



static char *path;



static int test_exec(void)

{

	SKIP_IF(!have_htm());



	asm __volatile__(

		"tbegin.;"

		"blt    1f; "

		"tsuspend.;"

		"1: ;"

		: : : "memory");



	execl(path, "tm-exec", "--child", NULL);



	/* Shouldn't get here */

	perror("execl() failed");

	return 1;

}



static int after_exec(void)

{

	asm __volatile__(

		"tbegin.;"

		"blt    1f;"

		"tsuspend.;"

		"1: ;"

		: : : "memory");



	FAIL_IF(failure_is_nesting());

	return 0;

}



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

{

	path = argv[0];



	if (argc > 1 && strcmp(argv[1], "--child") == 0)

		return after_exec();



	return test_harness(test_exec, "tm_exec");

}

tools/testing/selftests/powerpc/tm/tm-syscall.c

+0 −15
Original line number Diff line number Diff line
@@ -27,21 +27,6 @@ unsigned retries = 0; 
#define TEST_DURATION 10 /* seconds */

#define TM_RETRIES 100



long failure_code(void)

{

	return __builtin_get_texasru() >> 24;

}



bool failure_is_persistent(void)

{

	return (failure_code() & TM_CAUSE_PERSISTENT) == TM_CAUSE_PERSISTENT;

}



bool failure_is_syscall(void)

{

	return (failure_code() & TM_CAUSE_SYSCALL) == TM_CAUSE_SYSCALL;

}



pid_t getppid_tm(bool suspend)

{

	int i;

tools/testing/selftests/powerpc/tm/tm.h

+22 −1
Original line number Diff line number Diff line
@@ -6,8 +6,9 @@ 
#ifndef _SELFTESTS_POWERPC_TM_TM_H

#define _SELFTESTS_POWERPC_TM_TM_H



#include <stdbool.h>

#include <asm/tm.h>

#include <asm/cputable.h>

#include <stdbool.h>



#include "../utils.h"
@@ -31,4 +32,24 @@ static inline bool have_htm_nosc(void) 
#endif

}



static inline long failure_code(void)

{

	return __builtin_get_texasru() >> 24;

}



static inline bool failure_is_persistent(void)

{

	return (failure_code() & TM_CAUSE_PERSISTENT) == TM_CAUSE_PERSISTENT;

}



static inline bool failure_is_syscall(void)

{

	return (failure_code() & TM_CAUSE_SYSCALL) == TM_CAUSE_SYSCALL;

}



static inline bool failure_is_nesting(void)

{

	return (__builtin_get_texasru() & 0x400000);

}



#endif /* _SELFTESTS_POWERPC_TM_TM_H */