selftests/powerpc: Add test for forking inside transaction

tm-signal-msr-resv

tm-signal-stack

tm-vmxcopy

tm-fork

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

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

all: $(TEST_PROGS)

/*

 * Copyright 2015, Michael Neuling, IBM Corp.

 * Licensed under GPLv2.

 *

 * Edited: Rashmica Gupta, Nov 2015

 *

 * This test does a fork syscall inside a transaction. Basic sniff test

 * to see if we can enter the kernel during a transaction.

 */

#include <errno.h>

#include <inttypes.h>

#include <pthread.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include "utils.h"

#include "tm.h"

int test_fork(void)

{

	SKIP_IF(!have_htm());

	asm __volatile__(

		"tbegin.;"

		"blt    1f; "

		"li     0, 2;"  /* fork syscall */

		"sc  ;"

		"tend.;"

		"1: ;"

		: : : "memory", "r0");

	/* If we reach here, we've passed.  Otherwise we've probably crashed

	 * the kernel */

	return 0;

}

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

{

	return test_harness(test_fork, "tm_fork");

}