Throw C++ Exception in Android signal handler

gcc option: -fexceptions -fnon-call-exceptions -lgnustl_static


sighandler.cpp

#include <asm/sigcontext.h>
struct ucontext {
unsigned long  uc_flags;
struct ucontext  *uc_link;
stack_t  uc_stack;
struct sigcontext uc_mcontext;
sigset_t  uc_sigmask; /* mask last for extensibility */
};

static void throwCppException() {
    throw 1;
}

static void sig_handler(int sig, siginfo_t *si, void *unused) {
ucontext* uc = (ucontext*)unused;
#ifdef __thumb__
uc->uc_mcontext.arm_lr = (uc->uc_mcontext.arm_pc + 2) | 1;
uc->uc_mcontext.arm_pc = (int)(void*)throwCppException;
#elif defined __arm__
uc->uc_mcontext.arm_lr = (uc->uc_mcontext.arm_pc + 4);
uc->uc_mcontext.arm_pc = (int)(void*)throwCppException;
#elif defined(__i386__) || defined(__x86_64__)
(!!! Not Implemented !!!)
#endif
// just return. do not throw in sig_handler directly;
return;
}

void catch_signal_test() {
    struct sigaction sa;
    struct sigaction newAction, orgAction;

    sigemptyset(&newAction.sa_mask);
    newAction.sa_sigaction = sig_handler;
    newAction.sa_flags = SA_RESTART | SA_SIGINFO;
    sigaction(SIGSEGV, &newAction, &orgAction);

    // for Test
    try {
         volatile int* null_p = 0;
         *null_p = 1;
    }
    catch (int a) {
         ALOGD("Exception catched!!");
    }
}