(ddd.info)Hardware-Assisted Breakpoints

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5.1.12 Hardware-Assisted Breakpoints
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Using GDB, a few more commands related to breakpoints can be invoked
through the debugger console:

`hbreak POSITION'
     Sets a hardware-assisted breakpoint at POSITION.  This command
     requires hardware support and some target hardware may not have
     this support.  The main purpose of this is EPROM/ROM code
     debugging, so you can set a breakpoint at an instruction without
     changing the instruction.

`thbreak POS'
     Set a temporary hardware-assisted breakpoint at POS.

   Note: Setting breakpoints, for details.