63 lines
2.4 KiB
C
63 lines
2.4 KiB
C
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#if defined(__ANDROID__)
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#include <signal.h>
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extern int __real_sigaction(int signum, const struct sigaction *action, struct sigaction *old_action);
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// Workaround a bug on Krait CPUs where a signal handler would not properly transition from thumb to non-thumb.
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// Note: The workaround has a flaw if multiple signal handlers are used, then the last sigaction call overwrites wrapped_signal_handlers value.
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// Since it's only needed for ARM 32 bit, don't perform this workaround on other architectures
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// Note: Previously this workaround (when used for all CPU architectures) caused a test failure in unity repo:
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// - Tests\Unity.IntegrationTests\Android\AndroidCrashHandler.cs
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// Since the test was using multiple signal handlers to validate that handlers are correcty invoked when registered before and after Unity runtime initialization
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#if defined(__arm__)
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#define SIGMAX 64
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static void (*wrapped_signal_handlers[SIGMAX]) (int, siginfo_t *, void *);
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static void signal_handler(int signum, siginfo_t* siginfo, void* sigcontext)
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{
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if (wrapped_signal_handlers[signum])
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wrapped_signal_handlers[signum](signum, siginfo, sigcontext);
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}
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__attribute__((used)) int __wrap_sigaction(int signum, const struct sigaction *action, struct sigaction *old_action)
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{
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struct sigaction wrapper_action_data;
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struct sigaction* wrapper_action = NULL;
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if (signum >= SIGMAX)
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return __real_sigaction(signum, action, old_action);
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// patch sig action with our thumb compiled dispatcher
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if (action)
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{
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wrapper_action = &wrapper_action_data;
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memcpy(wrapper_action, action, sizeof(*action));
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wrapper_action->sa_sigaction = signal_handler;
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}
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// install handler (abort on error)
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if (__real_sigaction(signum, wrapper_action, old_action) == -1)
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return -1;
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// hide any previously installed wrapper
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if (old_action && old_action->sa_sigaction == signal_handler)
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old_action->sa_sigaction = wrapped_signal_handlers[signum];
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// add action to dispatch table
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if (action)
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wrapped_signal_handlers[signum] = action->sa_sigaction;
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return 0;
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}
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#undef SIGMAX
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#else
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__attribute__((used)) int __wrap_sigaction(int signum, const struct sigaction *action, struct sigaction *old_action)
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{
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return __real_sigaction(signum, action, old_action);
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}
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#endif
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#endif /* __ANDROID__ */
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