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How do I do the equivalent of an x86 software interrupt:
asm( "int $3" ) on an ARM processor (specifically a Cortex A8) to generate an event that will break execution under gdb?
786
Set breakpoints in source code To set a breakpoint in source code: Click in the far left margin next to a line of code. You can also select the line and press F9, select Debug > Toggle Breakpoint, or right-click and select Breakpoint > Insert breakpoint.
Setting breakpoints. Breakpoints are set with the break command (abbreviated b ). The debugger convenience variable `$bpnum' records the number of the breakpoint you've set most recently; see section Convenience variables, for a discussion of what you can do with convenience variables.
Software breakpoints stop your program when execution reaches a specific address. Software breakpoints are implemented by the debugger replacing the instruction at the breakpoint address with a special instruction.
Software breakpoints, on the other hand, are implemented by your debugger. They work by patching the code you are trying to execute with an instruction that triggers a debug event in some fashion.
Software breakpoints put an instruction in RAM that is executed like a TRAP when your program reaches that address. While hardware breakpoints use a register of the CPU to implement the breakpoint itself. That is why the hardware breakpoints are much faster.
To set breakpoints, type "break [filename]:[linenumber]". For example, if you wanted to set a breakpoint at line 55 of main. cpp, you would type "break main. cpp:55".
In software development, a breakpoint is an intentional stopping or pausing place in a program, put in place for debugging purposes. It is also sometimes simply referred to as a pause.
Using arm-none-eabi-gdb.exe cross compiler, this works great for me (thanks to Igor's answer):
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