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    case SIGFPE:
        switch(siginf->si_code) {
        case FPE_INTDIV:
        case FPE_FLTDIV:
            rt_error(uc, "division by zero");
            break;
        default:
            rt_error(uc, "floating point exception");
            break;
        }
        break;
    case SIGBUS:
    case SIGSEGV:
        if (rt_bound_error_msg && *rt_bound_error_msg)
            rt_error(uc, *rt_bound_error_msg);
        else
            rt_error(uc, "dereferencing invalid pointer");
        break;
    case SIGILL:
        rt_error(uc, "illegal instruction");
        break;
    case SIGABRT:
        rt_error(uc, "abort() called");
        break;
    default:
        rt_error(uc, "caught signal %d", signum);
        break;
    }
    exit(255);
}

#ifndef SA_SIGINFO
# define SA_SIGINFO 0x00000004u
#endif

/* Generate a stack backtrace when a CPU exception occurs. */
static void set_exception_handler(void)
{
    struct sigaction sigact;
    /* install TCC signal handlers to print debug info on fatal
       runtime errors */
    sigact.sa_flags = SA_SIGINFO | SA_RESETHAND;
    sigact.sa_sigaction = sig_error;
    sigemptyset(&sigact.sa_mask);
    sigaction(SIGFPE, &sigact, NULL);
    sigaction(SIGILL, &sigact, NULL);
    sigaction(SIGSEGV, &sigact, NULL);
    sigaction(SIGBUS, &sigact, NULL);
    sigaction(SIGABRT, &sigact, NULL);
}

/* ------------------------------------------------------------- */
#ifdef __i386__

/* fix for glibc 2.1 */
#ifndef REG_EIP
#define REG_EIP EIP
#define REG_EBP EBP
#endif

/* return the PC at frame level 'level'. Return negative if not found */
static int rt_get_caller_pc(addr_t *paddr, ucontext_t *uc, int level)
{
    addr_t fp;
    int i;

    if (level == 0) {
#if defined(__APPLE__)
        *paddr = uc->uc_mcontext->__ss.__eip;
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
        *paddr = uc->uc_mcontext.mc_eip;
#elif defined(__dietlibc__)
        *paddr = uc->uc_mcontext.eip;
#else
        *paddr = uc->uc_mcontext.gregs[REG_EIP];
#endif
        return 0;
    } else {
#if defined(__APPLE__)
        fp = uc->uc_mcontext->__ss.__ebp;
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
        fp = uc->uc_mcontext.mc_ebp;
#elif defined(__dietlibc__)
        fp = uc->uc_mcontext.ebp;
#else
        fp = uc->uc_mcontext.gregs[REG_EBP];
#endif
        for(i=1;i<level;i++) {
            /* XXX: check address validity with program info */
            if (fp <= 0x1000 || fp >= 0xc0000000)
                return -1;
            fp = ((addr_t *)fp)[0];
        }
        *paddr = ((addr_t *)fp)[1];
        return 0;
    }
}

/* ------------------------------------------------------------- */
#elif defined(__x86_64__)

/* return the PC at frame level 'level'. Return negative if not found */
static int rt_get_caller_pc(addr_t *paddr, ucontext_t *uc, int level)
{
    addr_t fp;
    int i;

    if (level == 0) {
        /* XXX: only support linux */
#if defined(__APPLE__)
        *paddr = uc->uc_mcontext->__ss.__rip;
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) 
        *paddr = uc->uc_mcontext.mc_rip;
#else
        *paddr = uc->uc_mcontext.gregs[REG_RIP];
#endif
        return 0;
    } else {
#if defined(__APPLE__)
        fp = uc->uc_mcontext->__ss.__rbp;
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
        fp = uc->uc_mcontext.mc_rbp;
#else
        fp = uc->uc_mcontext.gregs[REG_RBP];
#endif
        for(i=1;i<level;i++) {
            /* XXX: check address validity with program info */
            if (fp <= 0x1000)
                return -1;
            fp = ((addr_t *)fp)[0];
        }
        *paddr = ((addr_t *)fp)[1];
        return 0;
    }
}

/* ------------------------------------------------------------- */
#elif defined(__arm__)

/* return the PC at frame level 'level'. Return negative if not found */
static int rt_get_caller_pc(addr_t *paddr, ucontext_t *uc, int level)
{
    addr_t fp, sp;
    int i;

    if (level == 0) {
        /* XXX: only supports linux */
#if defined(__linux__)
        *paddr = uc->uc_mcontext.arm_pc;
#else
        return -1;
#endif
        return 0;
    } else {
#if defined(__linux__)
        fp = uc->uc_mcontext.arm_fp;
        sp = uc->uc_mcontext.arm_sp;
        if (sp < 0x1000)
            sp = 0x1000;
#else
        return -1;
#endif
        /* XXX: specific to tinycc stack frames */
        if (fp < sp + 12 || fp & 3)
            return -1;
        for(i = 1; i < level; i++) {
            sp = ((addr_t *)fp)[-2];
            if (sp < fp || sp - fp > 16 || sp & 3)
                return -1;
            fp = ((addr_t *)fp)[-3];
            if (fp <= sp || fp - sp < 12 || fp & 3)
                return -1;
        }
        /* XXX: check address validity with program info */
        *paddr = ((addr_t *)fp)[-1];
        return 0;
    }
}

/* ------------------------------------------------------------- */
#else

#warning add arch specific rt_get_caller_pc()
static int rt_get_caller_pc(addr_t *paddr, ucontext_t *uc, int level)
{
    return -1;
}

#endif /* !__i386__ */

/* ------------------------------------------------------------- */
#else /* WIN32 */

static long __stdcall cpu_exception_handler(EXCEPTION_POINTERS *ex_info)
{
    EXCEPTION_RECORD *er = ex_info->ExceptionRecord;
    CONTEXT *uc = ex_info->ContextRecord;
    switch (er->ExceptionCode) {
    case EXCEPTION_ACCESS_VIOLATION:
        if (rt_bound_error_msg && *rt_bound_error_msg)
            rt_error(uc, *rt_bound_error_msg);
        else
	    rt_error(uc, "access violation");
        break;
    case EXCEPTION_STACK_OVERFLOW:
        rt_error(uc, "stack overflow");
        break;
    case EXCEPTION_INT_DIVIDE_BY_ZERO:
        rt_error(uc, "division by zero");
        break;
    default:
        rt_error(uc, "exception caught");
        break;
    }
    return EXCEPTION_EXECUTE_HANDLER;
}

/* Generate a stack backtrace when a CPU exception occurs. */
static void set_exception_handler(void)
{
    SetUnhandledExceptionFilter(cpu_exception_handler);
}

#ifdef _WIN64
static void win64_add_function_table(TCCState *s1)
{
    RtlAddFunctionTable(
        (RUNTIME_FUNCTION*)s1->uw_pdata->sh_addr,
        s1->uw_pdata->data_offset / sizeof (RUNTIME_FUNCTION),
        text_section->sh_addr
        );
}
#endif

/* return the PC at frame level 'level'. Return non zero if not found */
static int rt_get_caller_pc(addr_t *paddr, CONTEXT *uc, int level)
{
    addr_t fp, pc;
    int i;
#ifdef _WIN64
    pc = uc->Rip;
    fp = uc->Rbp;
#else
    pc = uc->Eip;
    fp = uc->Ebp;
#endif
    if (level > 0) {
        for(i=1;i<level;i++) {
	    /* XXX: check address validity with program info */
	    if (fp <= 0x1000 || fp >= 0xc0000000)
		return -1;
	    fp = ((addr_t*)fp)[0];
	}
        pc = ((addr_t*)fp)[1];
    }
    *paddr = pc;
    return 0;
}

#endif /* _WIN32 */
#endif /* CONFIG_TCC_BACKTRACE */
/* ------------------------------------------------------------- */
#ifdef CONFIG_TCC_STATIC

/* dummy function for profiling */
ST_FUNC void *dlopen(const char *filename, int flag)
{
    return NULL;
}

ST_FUNC void dlclose(void *p)
{
}

ST_FUNC const char *dlerror(void)
{
    return "error";
}

typedef struct TCCSyms {
    char *str;
    void *ptr;
} TCCSyms;


/* add the symbol you want here if no dynamic linking is done */
static TCCSyms tcc_syms[] = {
#if !defined(CONFIG_TCCBOOT)
#define TCCSYM(a) { #a, &a, },
    TCCSYM(printf)
    TCCSYM(fprintf)
    TCCSYM(fopen)
    TCCSYM(fclose)
#undef TCCSYM
#endif