how does gdb call functions?
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A great way to get more visibility here is to "sniff" GDB RSP on a remote target using a gdbstub. The REPL thing is great. I use it a lot on bare-metal ARM to the extent that my gdbstub can't do breakpoints, but emulates them just to do the C function call.
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You can use "set debug remote 1" for gdb to print out the RSP messages.
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