linux/include/asm-mips/prctl.h

/*
 * IRIX prctl interface
 *
 * The IRIX kernel maps a page at PRDA_ADDRESS with the
 * contents of prda and fills it the bits on prda_sys.
 */

#ifndef __PRCTL_H__
#define __PRCTL_H__

#define PRDA_ADDRESS 0x200000L
#define PRDA ((struct prda *) PRDA_ADDRESS)

struct prda_sys {
	pid_t t_pid;
        u32   t_hint;
        u32   t_dlactseq;
        u32   t_fpflags;
        u32   t_prid;		/* processor type, $prid CP0 register */
        u32   t_dlendseq;
        u64   t_unused1[5];
        pid_t t_rpid;
        s32   t_resched;
        u32   t_unused[8];
        u32   t_cpu;		/* current/last cpu */

	/* FIXME: The signal information, not supported by Linux now */
	u32   t_flags;		/* if true, then the sigprocmask is in userspace */
	u32   t_sigprocmask [1]; /* the sigprocmask */
};

struct prda {
	char fill [0xe00];
	struct prda_sys prda_sys;
};

#define t_sys           prda_sys

ptrdiff_t prctl (int op, int v1, int v2);

#endif