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Rev 3168 Rev 4345
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    ipl_t user_mode = current_status_reg_read() &
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    ipl_t user_mode = current_status_reg_read() &
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        (~STATUS_REG_MODE_MASK | USER_MODE);
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        (~STATUS_REG_MODE_MASK | USER_MODE);
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    /* set user mode, set registers, jump */
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    /* set user mode, set registers, jump */
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    asm volatile (
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    asm volatile (
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        "mov sp, %0         \n"
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        "mov sp, %[ustate]\n"
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        "msr spsr_c, %1         \n"
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        "msr spsr_c, %[user_mode]\n"
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        "ldmfd sp!, {r0-r12, sp, lr}^   \n"
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        "ldmfd sp!, {r0-r12, sp, lr}^\n"
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        "ldmfd sp!, {pc}^\n"
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        "ldmfd sp!, {pc}^\n"
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        :
 - 
 
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        : "r" (&ustate), "r" (user_mode)
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        :: [ustate] "r" (&ustate), [user_mode] "r" (user_mode)
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    );
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    );
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    /* unreachable */
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    /* unreachable */
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    while(1)
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    while(1)
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        ;
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        ;