0x00000000 Divide By Zero Error
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code, especially for embedded systems, which may not be able to recover easily. The following shows how to catch division by zero errors in:integer division(software) floating point divisionand also shows divide by zero error sql how to identify which line of your source code caused the error.Integer division divide by zero error java Integer division by zero throws a signal by default, so you must either:re-implement__rt_raise()to deal with the signal in
Divide By Zero Error Encountered
a thread-safe mannerre-implement__aeabi_idiv0so that division by zero returns some standard result (such as 0) rather than raising a signal.Integer division is implemented by calling the C library functions__aeabi_idivand__aeabi_uidiv. These check for
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divison by zero. If integer division by zero is detected, a branch to__aeabi_idiv0is made. So to trap the division by zero, all you need to do is place a breakpoint on__aeabi_idiv0.N.B. As a result of changes from the ABI for the ARM Architecture,__rt_div0is now called__aeabi_idiv0,__rt_sdivis now called__aeabi_idivand__rt_udivis now called__aeabi_uidiv.These aeabi functions such as__aeabi_idiv0are documented in the Run-time ABI for the ARM Architecture.This can divide by zero error encountered in stored procedure be found at: http://www.arm.com/products/DevTools/ABI.htmlN.B. These names could change in a future release.On entry into__aeabi_idiv0, the Link Register (LR,R14) will contain the address of the instruction _after_ the call to the__aeabi_uidivdivision routine in your application code. Therefore, to identify the offending line in your source code, you can simply look up the line of C code in the debugger at that address given by LR.If you need to examine parameters, etc, and save them for post-mortem debugging, you can trap__aeabi_idiv0. You can intervene in all calls to__aeabi_idiv0by using the$Super$$ and $Sub$$mechanism. This is documented in chapter 4 of theLinker and Utilities Guide of your tools(e.g. ADS or RVDS).$Super$$__aeabi_idiv0identifies the original unpatched function__aeabi_idiv0(). Use this to call the original function directly.$Sub$$__aeabi_idiv0- identifies the new function that will be called instead of the original function__aeabi_idiv0(). Use this to add processing before or after the original function.Example:extern void $Super$$__aeabi_idiv0(void);/* this function will be called instead of the original __aeabi_idiv0() */void $Sub$$__aeabi_idiv0(){ // insert code to process a divide by zero ... // call the original __aeabi_idiv0 function $Super$$__aeabi_idiv0();}An alternative place to intercept divide by zero is in__rt_raise(). As docu
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pause(), and others for signal interaction. ANSI C signals use the APIs raise(), signal(), and abort() for signal interaction. Many other systems, by default, generate a POSIX signal whenever a http://as400bks.rochester.ibm.com/iseries/v5r2/ic2924/info/apis/concep31.htm software or hardware exception occurs (such as using a pointer that is not valid, or an error caused by dividing by zero), and on those systems, a POSIX signal may be equivalent and indistinguishable from an ANSI C signal. If the signal is not handled, this results in the termination of the process. OS/400 does not generate a signal for these divide by hardware or software problems, but instead, generates an exception message. The exception message moves up the call stack, allowing each stack frame (function on the stack or invocation entry) a chance to handle the exception. Each function invocation may choose whether or not to handle the exception. If the exception is not handled, the message continues to the next stack frame. divide by zero When the exception message reaches certain boundaries on the call stack (such as a main() entry point, usually called control boundaries), certain events take place. These events include changing the exception to a different type, terminating the process, terminating the activation group, or terminating the thread. If an exception that is not handled occurs in a secondary thread and moves all the way to the first invocation in the thread without being handled, the resulting action is to terminate the thread. During this movement, if the exception hits a control boundary and is not handled, it may terminate the process. The integrated language environment (ILE) C was present on the system before the POSIX signals implementation. Therefore, the ILE C uses the robust iSeries exception model to implement ANSI C signals (raise(), signal(), abort()). The ILE C also provides the generation of an ANSI C signal when it detects a hardware exception. Thus, using the signal() API, you can monitor and handle hardware exceptions. A signal is never automatically generated for an exception message. iSeries hardware and software exceptions cannot