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Examining parameters when integer division-by-zero errors occur in C code
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| Home > Compiler Coding Practices > Examining parameters when integer division-by-zero errors occur in C code | |||
If you want to examine parameters and save them for postmortem
debugging, you can trap __aeabi_idiv0. You
can intervene in all calls to __aeabi_idiv0 by
using the $Super$$ and $Sub$$ mechanism.
To examine parameters when integer division-by-zero occurs:
Prefix
__aeabi_idiv0()with$Super$$to identify the original unpatched function__aeabi_idiv0().Use
__aeabi_idiv0()prefixed with$Super$$to call the original function directly.Prefix
__aeabi_idiv0()with$Sub$$to identify the new function to be called in place of the original version of__aeabi_idiv0().Use
__aeabi_idiv0()prefixed with$Sub$$to add processing before or after the original function__aeabi_idiv0().
ExampleExample 15 illustrates
the use of the $Super$$ and $Sub$$ mechanism
to intercept __aeabi_div0.
Example 15. Intercepting __aeabi_div0 using $Super$$ and $Sub$$
extern void $Super$$__aeabi_idiv0(void);
/* this function is called instead of the original __aeabi_idiv0() */
void $Sub$$__aeabi_idiv0()
{
// insert code to process a divide by zero
...
// call the original __aeabi_idiv0 function
$Super$$__aeabi_idiv0();
}
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