FreeBSD/Linux Kernel Cross Reference
sys/cddl/dev/kinst/amd64/kinst_isa.h

     /*
      * SPDX-License-Identifier: CDDL 1.0
      *
      * Copyright 2022 Christos Margiolis <christos@FreeBSD.org>
      * Copyright 2022 Mark Johnston <markj@FreeBSD.org>
      */
     
     #ifndef _KINST_ISA_H_
     #define _KINST_ISA_H_
    
    #include <sys/types.h>
    
    #define KINST_PATCHVAL          0xcc
    
    /*
     * Each trampoline is 32 bytes long and contains [instruction, jmp]. Since we
     * have 2 instructions stored in the trampoline, and each of them can take up
     * to 16 bytes, 32 bytes is enough to cover even the worst case scenario.
     */
    #define KINST_TRAMP_SIZE        32
    #define KINST_TRAMPCHUNK_SIZE   PAGE_SIZE
    
    /*
     * Fill the trampolines with breakpoint instructions so that the kernel will
     * crash cleanly if things somehow go wrong.
     */
    #define KINST_TRAMP_INIT(t, s)  memset((t), KINST_PATCHVAL, (s))
    
    typedef uint8_t kinst_patchval_t;
    
    struct kinst_probe_md {
            int                     flags;
            int                     instlen;        /* original instr len */
            int                     tinstlen;       /* trampoline instr len */
            uint8_t                 template[16];   /* copied into thread tramps */
            int                     dispoff;        /* offset of rip displacement */
    
            /* operands to "call" instruction branch target */
            int                     reg1;
            int                     reg2;
            int                     scale;
            int64_t                 disp;
    };
    
    #endif /* _KINST_ISA_H_ */

Cache object: a3731c9cf4e2e3349abf70ddaf660a70