![]() Additional software breakpoints do not require additional hardware units in the processor, since instructions are replaced inside the code to indicate the breakpoint. Software breakpoints are different: The debugger modifies the program and replaces the breakpointed instruction with a special value. Hardware breakpoints do not require modification of the program code. ![]() ARM7, ARM9, and some devices implemented with the Cortex-M0+ cores have 2 breakpoint units (called 'watchpoint units' in ARM's documentation), allowing 2 hardware breakpoints to be set. In other words, the hardware dictates how many hardware breakpoints can be set simultaneously. ![]() Hardware breakpoints require a dedicated hardware unit for every breakpoint. There are basically 2 types of breakpoints in a computer system: Hardware breakpoints and software breakpoints.
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