ARM Compiler toolchain v4.1 for µVision Using the Compiler

Compiler Coding Practices
5.52 About trapping integer division-by-zero errors with __aeabi_idiv0()
Integer division-by-zero errors can be trapped with the C library helper function
__aeabi_idiv0() so that division by zero returns some standard result, for example zero.
Integer division is implemented in code through the C library helper functions __aeabi_idiv()
and __aeabi_uidiv(). Both functions check for division by zero.
When integer division by zero is detected, a branch to __aeabi_idiv0() is made. To trap the
division by zero, therefore, you only have to place a breakpoint on __aeabi_idiv0().
5.52.1 See also
Concepts
• Integer division-by-zero errors in C code on page 5-67
• About trapping integer division-by-zero errors with __rt_raise() on page 5-69.
Other information
• Run-time ABI for the ARM Architecture,
http://infocenter.arm.com/help/topic/com.arm.doc.ihi0043-/index.html.
ARM DUI 0375C Copyright © 2007-2008, 2011 ARM. All rights reserved. 5-68
ID061811
Non-Confidential