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
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019,2021 Arm Limited
* Original author: Dave Martin <Dave.Martin@arm.com>
*/
#include "system.h"
#include <stdbool.h>
#include <stddef.h>
#include <linux/errno.h>
#include <linux/auxvec.h>
#include <linux/signal.h>
#include <asm/sigcontext.h>
#include <asm/ucontext.h>
typedef struct ucontext ucontext_t;
#include "btitest.h"
#include "signal.h"
#define EXPECTED_TESTS 18
static volatile unsigned int test_num = 1;
static unsigned int test_passed;
static unsigned int test_failed;
static unsigned int test_skipped;
static void fdputs(int fd, const char *str)
{
size_t len = 0;
const char *p = str;
while (*p++)
++len;
write(fd, str, len);
}
static void putstr(const char *str)
{
fdputs(1, str);
}
static void putnum(unsigned int num)
{
char c;
if (num / 10)
putnum(num / 10);
c = '0' + (num % 10);
write(1, &c, 1);
}
#define puttestname(test_name, trampoline_name) do { \
putstr(test_name); \
putstr("/"); \
putstr(trampoline_name); \
} while (0)
void print_summary(void)
{
putstr("# Totals: pass:");
putnum(test_passed);
putstr(" fail:");
putnum(test_failed);
putstr(" xfail:0 xpass:0 skip:");
putnum(test_skipped);
putstr(" error:0\n");
}
static const char *volatile current_test_name;
static const char *volatile current_trampoline_name;
static volatile int sigill_expected, sigill_received;
static void handler(int n, siginfo_t *si __always_unused,
void *uc_ __always_unused)
{
ucontext_t *uc = uc_;
putstr("# \t[SIGILL in ");
puttestname(current_test_name, current_trampoline_name);
putstr(", BTYPE=");
write(1, &"00011011"[((uc->uc_mcontext.pstate & PSR_BTYPE_MASK)
>> PSR_BTYPE_SHIFT) * 2], 2);
if (!sigill_expected) {
putstr("]\n");
putstr("not ok ");
putnum(test_num);
putstr(" ");
puttestname(current_test_name, current_trampoline_name);
putstr("(unexpected SIGILL)\n");
print_summary();
exit(128 + n);
}
putstr(" (expected)]\n");
sigill_received = 1;
/* zap BTYPE so that resuming the faulting code will work */
uc->uc_mcontext.pstate &= ~PSR_BTYPE_MASK;
}
/* Does the system have BTI? */
static bool have_bti;
static void __do_test(void (*trampoline)(void (*)(void)),
void (*fn)(void),
const char *trampoline_name,
const char *name,
int expect_sigill)
{
/*
* Branch Target exceptions should only happen for BTI
* binaries running on a system with BTI:
*/
if (!BTI || !have_bti)
expect_sigill = 0;
sigill_expected = expect_sigill;
sigill_received = 0;
current_test_name = name;
current_trampoline_name = trampoline_name;
trampoline(fn);
if (expect_sigill && !sigill_received) {
putstr("not ok ");
test_failed++;
} else {
putstr("ok ");
test_passed++;
}
putnum(test_num++);
putstr(" ");
puttestname(name, trampoline_name);
putstr("\n");
}
#define do_test(expect_sigill_br_x0, \
expect_sigill_br_x16, \
expect_sigill_blr, \
name) \
do { \
__do_test(call_using_br_x0, name, "call_using_br_x0", #name, \
expect_sigill_br_x0); \
__do_test(call_using_br_x16, name, "call_using_br_x16", #name, \
expect_sigill_br_x16); \
__do_test(call_using_blr, name, "call_using_blr", #name, \
expect_sigill_blr); \
} while (0)
void start(int *argcp)
{
struct sigaction sa;
void *const *p;
const struct auxv_entry {
unsigned long type;
unsigned long val;
} *auxv;
unsigned long hwcap = 0, hwcap2 = 0;
putstr("TAP version 13\n");
putstr("1..");
putnum(EXPECTED_TESTS);
putstr("\n");
/* Gross hack for finding AT_HWCAP2 from the initial process stack: */
p = (void *const *)argcp + 1 + *argcp + 1; /* start of environment */
/* step over environment */
while (*p++)
;
for (auxv = (const struct auxv_entry *)p; auxv->type != AT_NULL; ++auxv) {
switch (auxv->type) {
case AT_HWCAP:
hwcap = auxv->val;
break;
case AT_HWCAP2:
hwcap2 = auxv->val;
break;
default:
break;
}
}
if (hwcap & HWCAP_PACA)
putstr("# HWCAP_PACA present\n");
else
putstr("# HWCAP_PACA not present\n");
if (hwcap2 & HWCAP2_BTI) {
putstr("# HWCAP2_BTI present\n");
if (!(hwcap & HWCAP_PACA))
putstr("# Bad hardware? Expect problems.\n");
have_bti = true;
} else {
putstr("# HWCAP2_BTI not present\n");
have_bti = false;
}
putstr("# Test binary");
if (!BTI)
putstr(" not");
putstr(" built for BTI\n");
sa.sa_handler = (sighandler_t)(void *)handler;
sa.sa_flags = SA_SIGINFO;
sigemptyset(&sa.sa_mask);
sigaction(SIGILL, &sa, NULL);
sigaddset(&sa.sa_mask, SIGILL);
sigprocmask(SIG_UNBLOCK, &sa.sa_mask, NULL);
do_test(1, 1, 1, nohint_func);
do_test(1, 1, 1, bti_none_func);
do_test(1, 0, 0, bti_c_func);
do_test(0, 0, 1, bti_j_func);
do_test(0, 0, 0, bti_jc_func);
do_test(1, 0, 0, paciasp_func);
print_summary();
if (test_num - 1 != EXPECTED_TESTS)
putstr("# WARNING - EXPECTED TEST COUNT WRONG\n");
if (test_failed)
exit(1);
else
exit(0);
}
|
