1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) International Business Machines Corp., 2008
* Copyright (c) Paul Mackerras, IBM Corp., 2008
* Copyright (c) 2018-2023 Linux Test Project
*/
/*
* Test little-endian mode switch system call. Requires a 64-bit
* processor that supports little-endian mode,such as POWER6.
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <elf.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "tst_test.h"
#if defined(__powerpc64__) || defined(__powerpc__)
# ifndef PPC_FEATURE_TRUE_LE
# define PPC_FEATURE_TRUE_LE 0x00000002
# endif
# ifdef HAVE_GETAUXVAL
# include <sys/auxv.h>
/*
* Make minimal call to 0x1ebe. If we get ENOSYS then syscall is not
* available, likely because of:
* commit 727f13616c45 ("powerpc: Disable the fast-endian switch syscall by default")
* If we get any other outcome, including crashes with various signals,
* then we assume syscall is available and carry on with the test.
*/
void check_le_switch_supported(void)
{
int status;
if (SAFE_FORK() == 0) {
syscall(0x1ebe);
exit(errno);
}
if (!(getauxval(AT_HWCAP) & PPC_FEATURE_TRUE_LE))
tst_brk(TCONF, "Processor does not support little-endian mode");
SAFE_WAIT(&status);
if (WIFSIGNALED(status)) {
int sig = WTERMSIG(status);
tst_res(TINFO, "check exited with sig %d", sig);
} else if (WIFEXITED(status)) {
int rc = WEXITSTATUS(status);
tst_res(TINFO, "check exited with %d", rc);
if (rc == ENOSYS)
tst_brk(TCONF, "fast endian switch (0x1ebe) N/A");
}
}
void test_le_switch(void)
{
int status;
if (SAFE_FORK() == 0) {
register int r0 asm("r0") = 0x1ebe;
asm volatile ("sc; .long 0x02000044"
: "=&r" (r0)
: "0"(r0)
: "cr0", "r9", "r10", "r11", "r12");
exit(0);
}
SAFE_WAIT(&status);
if (WIFSIGNALED(status)) {
int sig = WTERMSIG(status);
tst_res(TFAIL, "test exited with sig %d", sig);
} else if (WIFEXITED(status)) {
int rc = WEXITSTATUS(status);
if (rc != 0)
tst_res(TFAIL, "test exited with %d", rc);
else
tst_res(TPASS, "endian_switch() syscall tests passed");
}
}
static void endian_test(void)
{
check_le_switch_supported();
test_le_switch();
}
static struct tst_test test = {
.test_all = endian_test,
.forks_child = 1,
};
# else
TST_TEST_TCONF("Toolchain does not have <sys/auxv.h>");
# endif /* HAVE_GETAUXVAL */
#else /* defined (__powerpc64__) || (__powerpc__) */
TST_TEST_TCONF("This system does not support running of switch() syscall");
#endif
|
