iOS sysent structures

sysent.h

typedef int32_t sy_call_t(struct extern_proc *, void *, int *);
typedef void    sy_munge_t(const void *, void *);

//https://github.com/de7ec7ed/vertigo_applications/blob/493e4c6472fea33432d8f8c3a6819119e26c16f8/ios/krnldr/inc/kern.h
struct sysent50 {                   // system call table
    int16_t     sy_narg;            // number of args
    int8_t      sy_resv;            // reserved
    int8_t      sy_flags;           // flags
    sy_call_t   *sy_call;           // implementing function
    sy_munge_t  *sy_arg_munge32;    // system call arguments munger for 32-bit process
    sy_munge_t  *sy_arg_munge64;    // system call arguments munger for 64-bit process
    int32_t     sy_return_type;     // system call return types
    uint16_t    sy_arg_bytes;       // total size of arguments in bytes for 32-bit system calls
};

struct sysent60 {         /* system call table */
    sy_call_t       *sy_call;       /* implementing function */
    sy_munge_t      *sy_arg_munge32; /* system call arguments munger for 32-bit process */
    sy_munge_t      *sy_arg_munge64; /* system call arguments munger for 64-bit process */
    int32_t         sy_return_type; /* system call return types */
    uint16_t        sy_arg_bytes;   /* Total size of arguments in bytes for
                                     * 32-bit system calls
                                     */
    uint16_t        unknown;
    int16_t         sy_narg;        /* number of args */
    int8_t          sy_resv;        /* reserved  */
    int8_t          sy_flags;       /* flags */
};

//https://github.com/opensource-apple/xnu/blob/10.9/bsd/sys/sysent.h#L41
struct sysent70 {     /* system call table */
    sy_call_t   *sy_call;   /* implementing function */
    sy_munge_t  *sy_arg_munge32; /* system call arguments munger for 32-bit process */
    sy_munge_t  *sy_arg_munge64; /* system call arguments munger for 64-bit process */
    int32_t     sy_return_type; /* system call return types */
    int16_t     sy_narg;    /* number of args */
    uint16_t    sy_arg_bytes;   /* Total size of arguments in bytes for
                     * 32-bit system calls
                     */
};

//https://github.com/opensource-apple/xnu/blob/10.10/bsd/sys/sysent.h#L43
struct sysent80 {     /* system call table */
    sy_call_t   *sy_call;   /* implementing function */
#if CONFIG_REQUIRES_U32_MUNGING  // default is off.
    sy_munge_t  *sy_arg_munge32; /* system call arguments munger for 32-bit process */
#endif
    int32_t     sy_return_type; /* system call return types */
    int16_t     sy_narg;    /* number of args */
    uint16_t    sy_arg_bytes;   /* Total size of arguments in bytes for
                     * 32-bit system calls
                     */
};