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Merge "Fix signal mask save/restore for x86-64."

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Elliott Hughes 2014-12-08 21:40:15 +00:00 committed by Gerrit Code Review
commit 515a2ea1d5
2 changed files with 40 additions and 32 deletions
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24
libc/arch-x86_64/bionic/setjmp.S
View file

@ -48,6 +48,7 @@
#define _JB_PC 7
#define _JB_SIGFLAG 8
#define _JB_SIGMASK 9
#define _JB_SIGMASK_RT 10 // sigprocmask will write here too.
ENTRY(setjmp)
movl $1,%esi
@ -62,18 +63,19 @@ END(_setjmp)
// int sigsetjmp(sigjmp_buf env, int save_signal_mask);
ENTRY(sigsetjmp)
// Record whether or not we're saving the signal mask.
movl %esi,(_JB_SIGFLAG * 8)(%rdi)
movl %esi,(_JB_SIGFLAG * 8)(%rdi)
// Do we need to save the signal mask?
testl %esi,%esi
jz 2f
// Save the signal mask.
pushq %rdi
xorq %rdi,%rdi
call PIC_PLT(sigblock)
popq %rdi
movq %rax,(_JB_SIGMASK * 8)(%rdi)
// Save current signal mask.
pushq %rdi // Push 'env'.
// The 'how' argument is ignored if new_mask is NULL.
xorq %rsi,%rsi // NULL.
leaq (_JB_SIGMASK * 8)(%rdi),%rdx // old_mask.
call PIC_PLT(sigprocmask)
popq %rdi // Pop 'env'.
2:
// Save the callee-save registers.
@ -97,12 +99,14 @@ ENTRY(siglongjmp)
pushq %rsi // Push 'value'.
// Do we need to restore the signal mask?
cmpl $0, (_JB_SIGFLAG * 8)(%rdi)
cmpl $0,(_JB_SIGFLAG * 8)(%rdi)
jz 2f
// Restore the signal mask.
movq (_JB_SIGMASK * 8)(%rdi),%rdi
call PIC_PLT(sigsetmask)
movq $2,%rdi // SIG_SETMASK.
leaq (_JB_SIGMASK * 8)(%r12),%rsi // new_mask.
xorq %rdx,%rdx // NULL.
call PIC_PLT(sigprocmask)
2:
popq %rax // Pop 'value'.

48
tests/setjmp_test.cpp
View file

@ -63,17 +63,29 @@ TEST(setjmp, sigsetjmp_1_smoke) {
}
}
static sigset_t SigSetOf(int signal) {
static sigset_t SigSetOf(int signal, int rt_signal = 0) {
sigset_t ss;
sigemptyset(&ss);
sigaddset(&ss, signal);
if (rt_signal != 0) {
sigaddset(&ss, rt_signal);
}
return ss;
}
void AssertSigmaskEquals(const sigset_t& expected) {
sigset_t actual;
sigprocmask(0 /* ignored */, NULL, &actual);
size_t end = sizeof(sigset_t) * 8;
for (size_t i = 1; i <= end; ++i) {
EXPECT_EQ(sigismember(&expected, i), sigismember(&actual, i)) << i;
}
}
TEST(setjmp, _setjmp_signal_mask) {
// _setjmp/_longjmp do not save/restore the signal mask.
sigset_t ss1(SigSetOf(SIGUSR1));
sigset_t ss2(SigSetOf(SIGUSR2));
sigset_t ss1(SigSetOf(SIGUSR1, SIGRTMIN + 8));
sigset_t ss2(SigSetOf(SIGUSR2, SIGRTMIN + 9));
sigset_t original_set;
sigprocmask(SIG_SETMASK, &ss1, &original_set);
jmp_buf jb;
@ -82,9 +94,7 @@ TEST(setjmp, _setjmp_signal_mask) {
_longjmp(jb, 1);
FAIL(); // Unreachable.
} else {
sigset_t ss;
sigprocmask(SIG_SETMASK, NULL, &ss);
EXPECT_TRUE(sigismember(&ss, SIGUSR2));
AssertSigmaskEquals(ss2);
}
sigprocmask(SIG_SETMASK, &original_set, NULL);
}
@ -93,8 +103,8 @@ TEST(setjmp, setjmp_signal_mask) {
// setjmp/longjmp do save/restore the signal mask on bionic, but not on glibc.
// This is a BSD versus System V historical accident. POSIX leaves the
// behavior unspecified, so any code that cares needs to use sigsetjmp.
sigset_t ss1(SigSetOf(SIGUSR1));
sigset_t ss2(SigSetOf(SIGUSR2));
sigset_t ss1(SigSetOf(SIGUSR1, SIGRTMIN + 8));
sigset_t ss2(SigSetOf(SIGUSR2, SIGRTMIN + 9));
sigset_t original_set;
sigprocmask(SIG_SETMASK, &ss1, &original_set);
jmp_buf jb;
@ -103,14 +113,12 @@ TEST(setjmp, setjmp_signal_mask) {
longjmp(jb, 1);
FAIL(); // Unreachable.
} else {
sigset_t ss;
sigprocmask(SIG_SETMASK, NULL, &ss);
#if defined(__BIONIC__)
// bionic behaves like BSD and does save/restore the signal mask.
EXPECT_TRUE(sigismember(&ss, SIGUSR1));
AssertSigmaskEquals(ss1);
#else
// glibc behaves like System V and doesn't save/restore the signal mask.
EXPECT_TRUE(sigismember(&ss, SIGUSR2));
AssertSigmaskEquals(ss2);
#endif
}
sigprocmask(SIG_SETMASK, &original_set, NULL);
@ -118,8 +126,8 @@ TEST(setjmp, setjmp_signal_mask) {
TEST(setjmp, sigsetjmp_0_signal_mask) {
// sigsetjmp(0)/siglongjmp do not save/restore the signal mask.
sigset_t ss1(SigSetOf(SIGUSR1));
sigset_t ss2(SigSetOf(SIGUSR2));
sigset_t ss1(SigSetOf(SIGUSR1, SIGRTMIN + 8));
sigset_t ss2(SigSetOf(SIGUSR2, SIGRTMIN + 9));
sigset_t original_set;
sigprocmask(SIG_SETMASK, &ss1, &original_set);
sigjmp_buf sjb;
@ -128,17 +136,15 @@ TEST(setjmp, sigsetjmp_0_signal_mask) {
siglongjmp(sjb, 1);
FAIL(); // Unreachable.
} else {
sigset_t ss;
sigprocmask(SIG_SETMASK, NULL, &ss);
EXPECT_TRUE(sigismember(&ss, SIGUSR2));
AssertSigmaskEquals(ss2);
}
sigprocmask(SIG_SETMASK, &original_set, NULL);
}
TEST(setjmp, sigsetjmp_1_signal_mask) {
// sigsetjmp(1)/siglongjmp does save/restore the signal mask.
sigset_t ss1(SigSetOf(SIGUSR1));
sigset_t ss2(SigSetOf(SIGUSR2));
sigset_t ss1(SigSetOf(SIGUSR1, SIGRTMIN + 8));
sigset_t ss2(SigSetOf(SIGUSR2, SIGRTMIN + 9));
sigset_t original_set;
sigprocmask(SIG_SETMASK, &ss1, &original_set);
sigjmp_buf sjb;
@ -147,9 +153,7 @@ TEST(setjmp, sigsetjmp_1_signal_mask) {
siglongjmp(sjb, 1);
FAIL(); // Unreachable.
} else {
sigset_t ss;
sigprocmask(SIG_SETMASK, NULL, &ss);
EXPECT_TRUE(sigismember(&ss, SIGUSR1));
AssertSigmaskEquals(ss1);
}
sigprocmask(SIG_SETMASK, &original_set, NULL);
}