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100 lines
5.3 KiB
C
100 lines
5.3 KiB
C
// SPDX-License-Identifier: LGPL-3.0-or-later
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/**
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* \file bgp/vm_optab.h
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*
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* Computed goto table for GNUC optimized BGP VM execution loop.
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*
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* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
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* \author Lorenzo Cogotti
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*
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* File defines a GNUC-specific computed goto table.
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*
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* It can be used as an alternative to a regular switch to
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* accelerate the BGP filtering engine execution loop (Bgp_VmExec()).
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*
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* Constraints:
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* - Array length: 256 (8-bit OPCODE width)
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* - Label address MUST follow the convention EX_<OPCODE NAME> (e.g. EX_NOP, EX_EXCT)
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* - Any unused OPCODE MUST be set to EX_SIGILL
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*
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* Operations on the computed goto table are defined in: bgp/vm_gccdef.h
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*
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* \see [GCC Documentation](https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html)
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*
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* \warning KEEP TABLE IN SYNC WITH OPCODES IN: bgp/vm.h
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*/
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wpedantic"
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#pragma GCC diagnostic ignored "-Woverride-init"
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static void *const bgp_vmOpTab[256] = {
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// Following clears everything else in the array to SIGILL,
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// 8 instructions per line (256 &&EX_SIGILL)
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
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// Following initializes valid OPCODEs
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[BGP_VMOP_NOP] = &&EX_NOP,
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[BGP_VMOP_LOAD] = &&EX_LOAD,
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[BGP_VMOP_LOADU] = &&EX_LOADU,
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[BGP_VMOP_LOADN] = &&EX_LOADN,
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[BGP_VMOP_LOADK] = &&EX_LOADK,
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[BGP_VMOP_CALL] = &&EX_CALL,
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[BGP_VMOP_BLK] = &&EX_BLK,
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[BGP_VMOP_ENDBLK] = &&EX_ENDBLK,
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[BGP_VMOP_TAG] = &&EX_TAG,
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[BGP_VMOP_NOT] = &&EX_NOT,
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[BGP_VMOP_CFAIL] = &&EX_CFAIL,
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[BGP_VMOP_CPASS] = &&EX_CPASS,
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[BGP_VMOP_ORFAIL] = &&EX_ORFAIL,
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[BGP_VMOP_ORPASS] = &&EX_ORPASS,
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[BGP_VMOP_JZ] = &&EX_JZ,
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[BGP_VMOP_JNZ] = &&EX_JNZ,
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[BGP_VMOP_CHKT] = &&EX_CHKT,
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[BGP_VMOP_CHKA] = &&EX_CHKA,
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[BGP_VMOP_EXCT] = &&EX_EXCT,
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[BGP_VMOP_SUPN] = &&EX_SUPN,
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[BGP_VMOP_SUBN] = &&EX_SUBN,
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[BGP_VMOP_RELT] = &&EX_RELT,
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[BGP_VMOP_ASMTCH] = &&EX_ASMTCH,
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[BGP_VMOP_COMTCH] = &&EX_COMTCH,
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[BGP_VMOP_ACOMTC] = &&EX_ACOMTC,
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[BGP_VMOP_END] = &&EX_END
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};
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#pragma GCC diagnostic pop
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