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efi gdbstub crash - ccywork - 2018-09-25 09:41

Thanks everyone. I build ipxe like : make bin-x86_64-efi/ipxe.efi, but when I debug it with gdbstub serial, ipxe crash at line "__asm__ __volatile__ ( "int $3" )" in function gdbmach_breakpoint. What's wrong ? Does ipxe.efi can debug with gdbstub? If not ,how can I debug it?
Thanks you very much!