116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) International Business Machines Corp., 2008
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* Copyright (c) Paul Mackerras, IBM Corp., 2008
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* Copyright (c) 2018 Linux Test Project
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*/
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/*
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* Test little-endian mode switch system call. Requires a 64-bit
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* processor that supports little-endian mode,such as POWER6.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <elf.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include "tst_test.h"
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#if defined(__powerpc64__) || defined(__powerpc__)
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# ifndef PPC_FEATURE_TRUE_LE
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# define PPC_FEATURE_TRUE_LE 0x00000002
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# endif
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# define TST_NO_DEFAULT_MAIN
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/*
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* Make minimal call to 0x1ebe. If we get ENOSYS then syscall is not
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* available, likely because of:
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* commit 727f13616c45 ("powerpc: Disable the fast-endian switch syscall by default")
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* If we get any other outcome, including crashes with various signals,
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* then we assume syscall is available and carry on with the test.
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*/
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void check_le_switch_supported(void)
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{
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int status;
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if (SAFE_FORK() == 0) {
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syscall(0x1ebe);
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exit(errno);
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}
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SAFE_WAIT(&status);
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if (WIFSIGNALED(status)) {
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int sig = WTERMSIG(status);
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tst_res(TINFO, "check exited with sig %d", sig);
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} else if (WIFEXITED(status)) {
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int rc = WEXITSTATUS(status);
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tst_res(TINFO, "check exited with %d", rc);
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if (rc == ENOSYS)
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tst_brk(TCONF, "fast endian switch (0x1ebe) N/A");
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}
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}
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void test_le_switch(void)
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{
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int status;
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if (SAFE_FORK() == 0) {
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register int r0 asm("r0") = 0x1ebe;
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asm volatile ("sc; .long 0x02000044"
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: "=&r" (r0)
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: "0"(r0)
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: "cr0", "r9", "r10", "r11", "r12");
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exit(0);
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}
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SAFE_WAIT(&status);
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if (WIFSIGNALED(status)) {
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int sig = WTERMSIG(status);
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tst_res(TFAIL, "test exited with sig %d", sig);
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} else if (WIFEXITED(status)) {
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int rc = WEXITSTATUS(status);
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if (rc != 0)
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tst_res(TFAIL, "test exited with %d", rc);
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else
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tst_res(TPASS, "endian_switch() syscall tests passed");
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}
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}
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static void endian_test(void)
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{
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check_le_switch_supported();
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test_le_switch();
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}
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static struct tst_test test = {
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.test_all = endian_test,
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.min_kver = "2.6.26",
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.forks_child = 1,
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};
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int main4(int argc, char **argv, LTP_ATTRIBUTE_UNUSED char **envp,
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unsigned long *auxv)
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{
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for (; *auxv != AT_NULL && *auxv != AT_HWCAP; auxv += 2)
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;
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if (!(auxv[0] == AT_HWCAP && (auxv[1] & PPC_FEATURE_TRUE_LE)))
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tst_brk(TCONF, "Processor does not support little-endian mode");
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tst_run_tcases(argc, argv, &test);
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return 0;
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}
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#else /* defined (__powerpc64__) || (__powerpc__) */
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TST_TEST_TCONF("This system does not support running of switch() syscall");
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#endif
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