selftests/powerpc: Add a test of sigreturning to an unaligned address

sigreturn_vdso

sig_sc_double_restart

sigreturn_kernel

sigreturn_unaligned

# SPDX-License-Identifier: GPL-2.0

TEST_GEN_PROGS := signal signal_tm sigfuz sigreturn_vdso sig_sc_double_restart

TEST_GEN_PROGS += sigreturn_kernel

TEST_GEN_PROGS += sigreturn_unaligned

CFLAGS += -maltivec

$(OUTPUT)/signal_tm: CFLAGS += -mhtm

// SPDX-License-Identifier: GPL-2.0

/*

 * Test sigreturn to an unaligned address, ie. low 2 bits set.

 * Nothing bad should happen.

 * This was able to trigger warnings with CONFIG_PPC_RFI_SRR_DEBUG=y.

 */

#include <signal.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <ucontext.h>

#include <unistd.h>

#include "utils.h"

static void sigusr1_handler(int signo, siginfo_t *info, void *ptr)

{

	ucontext_t *uc = ptr;

	UCONTEXT_NIA(uc) |= 3;

}

static int test_sigreturn_unaligned(void)

{

	struct sigaction action;

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

	action.sa_sigaction = sigusr1_handler;

	action.sa_flags = SA_SIGINFO;

	FAIL_IF(sigaction(SIGUSR1, &action, NULL) == -1);

	raise(SIGUSR1);

	return 0;

}

int main(void)

{

	return test_harness(test_sigreturn_unaligned, "sigreturn_unaligned");

}