1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <gtest/gtest.h>
18
19 #include <setjmp.h>
20 #include <stdlib.h>
21
TEST(setjmp,setjmp_smoke)22 TEST(setjmp, setjmp_smoke) {
23 int value;
24 jmp_buf jb;
25 if ((value = setjmp(jb)) == 0) {
26 longjmp(jb, 123);
27 FAIL(); // Unreachable.
28 } else {
29 ASSERT_EQ(123, value);
30 }
31 }
32
TEST(setjmp,_setjmp_smoke)33 TEST(setjmp, _setjmp_smoke) {
34 int value;
35 jmp_buf jb;
36 if ((value = _setjmp(jb)) == 0) {
37 _longjmp(jb, 456);
38 FAIL(); // Unreachable.
39 } else {
40 ASSERT_EQ(456, value);
41 }
42 }
43
TEST(setjmp,sigsetjmp_0_smoke)44 TEST(setjmp, sigsetjmp_0_smoke) {
45 int value;
46 sigjmp_buf jb;
47 if ((value = sigsetjmp(jb, 0)) == 0) {
48 siglongjmp(jb, 789);
49 FAIL(); // Unreachable.
50 } else {
51 ASSERT_EQ(789, value);
52 }
53 }
54
TEST(setjmp,sigsetjmp_1_smoke)55 TEST(setjmp, sigsetjmp_1_smoke) {
56 int value;
57 sigjmp_buf jb;
58 if ((value = sigsetjmp(jb, 0)) == 0) {
59 siglongjmp(jb, 0xabc);
60 FAIL(); // Unreachable.
61 } else {
62 ASSERT_EQ(0xabc, value);
63 }
64 }
65
66 // Two distinct signal sets, pipu
67 struct SigSets {
SigSetsSigSets68 SigSets() : one(MakeSigSet(0)), two(MakeSigSet(1)) {
69 }
70
MakeSigSetSigSets71 static sigset_t MakeSigSet(int offset) {
72 sigset_t ss;
73 sigemptyset(&ss);
74 sigaddset(&ss, SIGUSR1 + offset);
75 #if defined(__LP64__)
76 // For arm and x86, sigset_t was too small for the RT signals.
77 // For mips, sigset_t was large enough but jmp_buf wasn't.
78 sigaddset(&ss, SIGRTMIN + offset);
79 #endif
80 return ss;
81 }
82
83 sigset_t one;
84 sigset_t two;
85 sigset_t original;
86 };
87
AssertSigmaskEquals(const sigset_t & expected)88 void AssertSigmaskEquals(const sigset_t& expected) {
89 sigset_t actual;
90 sigprocmask(0 /* ignored */, NULL, &actual);
91 size_t end = sizeof(sigset_t) * 8;
92 for (size_t i = 1; i <= end; ++i) {
93 EXPECT_EQ(sigismember(&expected, i), sigismember(&actual, i)) << i;
94 }
95 }
96
TEST(setjmp,_setjmp_signal_mask)97 TEST(setjmp, _setjmp_signal_mask) {
98 // _setjmp/_longjmp do not save/restore the signal mask.
99 SigSets ss;
100 sigprocmask(SIG_SETMASK, &ss.one, &ss.original);
101 jmp_buf jb;
102 if (_setjmp(jb) == 0) {
103 sigprocmask(SIG_SETMASK, &ss.two, NULL);
104 _longjmp(jb, 1);
105 FAIL(); // Unreachable.
106 } else {
107 AssertSigmaskEquals(ss.two);
108 }
109 sigprocmask(SIG_SETMASK, &ss.original, NULL);
110 }
111
TEST(setjmp,setjmp_signal_mask)112 TEST(setjmp, setjmp_signal_mask) {
113 // setjmp/longjmp do save/restore the signal mask on bionic, but not on glibc.
114 // This is a BSD versus System V historical accident. POSIX leaves the
115 // behavior unspecified, so any code that cares needs to use sigsetjmp.
116 SigSets ss;
117 sigprocmask(SIG_SETMASK, &ss.one, &ss.original);
118 jmp_buf jb;
119 if (setjmp(jb) == 0) {
120 sigprocmask(SIG_SETMASK, &ss.two, NULL);
121 longjmp(jb, 1);
122 FAIL(); // Unreachable.
123 } else {
124 #if defined(__BIONIC__)
125 // bionic behaves like BSD and does save/restore the signal mask.
126 AssertSigmaskEquals(ss.one);
127 #else
128 // glibc behaves like System V and doesn't save/restore the signal mask.
129 AssertSigmaskEquals(ss.two);
130 #endif
131 }
132 sigprocmask(SIG_SETMASK, &ss.original, NULL);
133 }
134
TEST(setjmp,sigsetjmp_0_signal_mask)135 TEST(setjmp, sigsetjmp_0_signal_mask) {
136 // sigsetjmp(0)/siglongjmp do not save/restore the signal mask.
137 SigSets ss;
138 sigprocmask(SIG_SETMASK, &ss.one, &ss.original);
139 sigjmp_buf sjb;
140 if (sigsetjmp(sjb, 0) == 0) {
141 sigprocmask(SIG_SETMASK, &ss.two, NULL);
142 siglongjmp(sjb, 1);
143 FAIL(); // Unreachable.
144 } else {
145 AssertSigmaskEquals(ss.two);
146 }
147 sigprocmask(SIG_SETMASK, &ss.original, NULL);
148 }
149
TEST(setjmp,sigsetjmp_1_signal_mask)150 TEST(setjmp, sigsetjmp_1_signal_mask) {
151 // sigsetjmp(1)/siglongjmp does save/restore the signal mask.
152 SigSets ss;
153 sigprocmask(SIG_SETMASK, &ss.one, &ss.original);
154 sigjmp_buf sjb;
155 if (sigsetjmp(sjb, 1) == 0) {
156 sigprocmask(SIG_SETMASK, &ss.two, NULL);
157 siglongjmp(sjb, 1);
158 FAIL(); // Unreachable.
159 } else {
160 AssertSigmaskEquals(ss.one);
161 }
162 sigprocmask(SIG_SETMASK, &ss.original, NULL);
163 }
164
165 #if defined(__aarch64__)
166 #define SET_FREG(n, v) asm volatile("fmov d"#n ", "#v : : : "d"#n)
167 #define CLEAR_FREG(n) asm volatile("fmov d"#n ", xzr" : : : "d"#n)
168 #define SET_FREGS \
169 SET_FREG(8, 8.0); SET_FREG(9, 9.0); SET_FREG(10, 10.0); SET_FREG(11, 11.0); \
170 SET_FREG(12, 12.0); SET_FREG(13, 13.0); SET_FREG(14, 14.0); SET_FREG(15, 15.0);
171 #define CLEAR_FREGS \
172 CLEAR_FREG(8); CLEAR_FREG(9); CLEAR_FREG(10); CLEAR_FREG(11); \
173 CLEAR_FREG(12); CLEAR_FREG(13); CLEAR_FREG(14); CLEAR_FREG(15);
174 #define GET_FREG(n) ({ double _r; asm volatile("fmov %0, d"#n : "=r"(_r) : :); _r; })
175 #define CHECK_FREGS \
176 EXPECT_EQ(8.0, GET_FREG(8)); EXPECT_EQ(9.0, GET_FREG(9)); \
177 EXPECT_EQ(10.0, GET_FREG(10)); EXPECT_EQ(11.0, GET_FREG(11)); \
178 EXPECT_EQ(12.0, GET_FREG(12)); EXPECT_EQ(13.0, GET_FREG(13)); \
179 EXPECT_EQ(14.0, GET_FREG(14)); EXPECT_EQ(15.0, GET_FREG(15));
180 #elif defined(__arm__)
181 #define SET_FREG(n, v) \
182 ({ const double _v{v}; asm volatile("fcpyd d"#n ", %P0" : : "w"(_v) : "d"#n); })
183 #define SET_FREGS \
184 SET_FREG(8, 8); SET_FREG(9, 9); SET_FREG(10, 10); SET_FREG(11, 11); \
185 SET_FREG(12, 12); SET_FREG(13, 13); SET_FREG(14, 14); SET_FREG(15, 15);
186 #define CLEAR_FREGS \
187 SET_FREG(8, 0); SET_FREG(9, 0); SET_FREG(10, 0); SET_FREG(11, 0); \
188 SET_FREG(12, 0); SET_FREG(13, 0); SET_FREG(14, 0); SET_FREG(15, 0);
189 #define GET_FREG(n) ({ double _r; asm volatile("fcpyd %P0, d"#n : "=w"(_r) : :); _r;})
190 #define CHECK_FREGS \
191 EXPECT_EQ(8.0, GET_FREG(8)); EXPECT_EQ(9.0, GET_FREG(9)); \
192 EXPECT_EQ(10.0, GET_FREG(10)); EXPECT_EQ(11.0, GET_FREG(11)); \
193 EXPECT_EQ(12.0, GET_FREG(12)); EXPECT_EQ(13.0, GET_FREG(13)); \
194 EXPECT_EQ(14.0, GET_FREG(14)); EXPECT_EQ(15.0, GET_FREG(15));
195 #else
196 /* The other architectures don't save/restore fp registers. */
197 #define SET_FREGS
198 #define CLEAR_FREGS
199 #define CHECK_FREGS
200 #endif
201
TEST(setjmp,setjmp_fp_registers)202 TEST(setjmp, setjmp_fp_registers) {
203 int value;
204 jmp_buf jb;
205 SET_FREGS;
206 if ((value = setjmp(jb)) == 0) {
207 CLEAR_FREGS;
208 longjmp(jb, 123);
209 FAIL(); // Unreachable.
210 } else {
211 ASSERT_EQ(123, value);
212 CHECK_FREGS;
213 }
214 }
215
216 #if defined(__arm__)
217 #define __JB_SIGFLAG 0
218 #elif defined(__aarch64__)
219 #define __JB_SIGFLAG 0
220 #elif defined(__i386__)
221 #define __JB_SIGFLAG 7
222 #elif defined(__x86_64)
223 #define __JB_SIGFLAG 8
224 #elif defined(__mips__) && defined(__LP64__)
225 #define __JB_SIGFLAG 1
226 #elif defined(__mips__)
227 #define __JB_SIGFLAG 2
228 #endif
229
TEST(setjmp,setjmp_cookie)230 TEST(setjmp, setjmp_cookie) {
231 jmp_buf jb;
232 int value = setjmp(jb);
233 ASSERT_EQ(0, value);
234
235 #if defined(__mips__) && !defined(__LP64__)
236 // round address to 8-byte boundry
237 uintptr_t jb_aligned = reinterpret_cast<uintptr_t>(jb) & ~7L;
238 long* sigflag = reinterpret_cast<long*>(jb_aligned) + __JB_SIGFLAG;
239 #else
240 long* sigflag = reinterpret_cast<long*>(jb) + __JB_SIGFLAG;
241 #endif
242
243 // Make sure there's actually a cookie.
244 EXPECT_NE(0, *sigflag & ~1);
245
246 // Wipe it out
247 *sigflag &= 1;
248 EXPECT_DEATH(longjmp(jb, 0), "");
249 }
250
TEST(setjmp,setjmp_cookie_checksum)251 TEST(setjmp, setjmp_cookie_checksum) {
252 jmp_buf jb;
253 int value = setjmp(jb);
254
255 if (value == 0) {
256 // Flip a bit.
257 reinterpret_cast<long*>(jb)[0] ^= 1;
258
259 EXPECT_DEATH(longjmp(jb, 1), "checksum mismatch");
260 } else {
261 fprintf(stderr, "setjmp_cookie_checksum: longjmp succeeded?");
262 }
263 }
264