gdbsupport/x86-xstate.h

/* Common code for x86 XSAVE extended state.

   Copyright (C) 2010-2021 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef COMMON_X86_XSTATE_H
#define COMMON_X86_XSTATE_H

/* The extended state feature bits.  */
#define X86_XSTATE_X87		(1ULL << 0)
#define X86_XSTATE_SSE		(1ULL << 1)
#define X86_XSTATE_AVX		(1ULL << 2)
#define X86_XSTATE_BNDREGS	(1ULL << 3)
#define X86_XSTATE_BNDCFG	(1ULL << 4)
#define X86_XSTATE_MPX		(X86_XSTATE_BNDREGS | X86_XSTATE_BNDCFG)

/* AVX 512 adds three feature bits.  All three must be enabled.  */
#define X86_XSTATE_K		(1ULL << 5)
#define X86_XSTATE_ZMM_H	(1ULL << 6)
#define X86_XSTATE_ZMM		(1ULL << 7)
#define X86_XSTATE_AVX512	(X86_XSTATE_K | X86_XSTATE_ZMM_H \
				 | X86_XSTATE_ZMM)

#define X86_XSTATE_PKRU		(1ULL << 9)

/* Supported mask and size of the extended state.  */
#define X86_XSTATE_X87_MASK	X86_XSTATE_X87
#define X86_XSTATE_SSE_MASK	(X86_XSTATE_X87 | X86_XSTATE_SSE)
#define X86_XSTATE_AVX_MASK	(X86_XSTATE_SSE_MASK | X86_XSTATE_AVX)
#define X86_XSTATE_MPX_MASK	(X86_XSTATE_SSE_MASK | X86_XSTATE_MPX)
#define X86_XSTATE_AVX_MPX_MASK	(X86_XSTATE_AVX_MASK | X86_XSTATE_MPX)
#define X86_XSTATE_AVX_AVX512_MASK	(X86_XSTATE_AVX_MASK | X86_XSTATE_AVX512)
#define X86_XSTATE_AVX_MPX_AVX512_PKU_MASK 	(X86_XSTATE_AVX_MPX_MASK\
					| X86_XSTATE_AVX512 | X86_XSTATE_PKRU)

#define X86_XSTATE_ALL_MASK		(X86_XSTATE_AVX_MPX_AVX512_PKU_MASK)


#define X86_XSTATE_SSE_SIZE	576
#define X86_XSTATE_AVX_SIZE	832
#define X86_XSTATE_BNDREGS_SIZE	1024
#define X86_XSTATE_BNDCFG_SIZE	1088
#define X86_XSTATE_AVX512_SIZE	2688
#define X86_XSTATE_PKRU_SIZE	2696
#define X86_XSTATE_MAX_SIZE	2696


/* In case one of the MPX XCR0 bits is set we consider we have MPX.  */
#define HAS_MPX(XCR0) (((XCR0) & X86_XSTATE_MPX) != 0)
#define HAS_AVX(XCR0) (((XCR0) & X86_XSTATE_AVX) != 0)
#define HAS_AVX512(XCR0) (((XCR0) & X86_XSTATE_AVX512) != 0)
#define HAS_PKRU(XCR0) (((XCR0) & X86_XSTATE_PKRU) != 0)

/* Get I386 XSAVE extended state size.  */
#define X86_XSTATE_SIZE(XCR0) \
    (HAS_PKRU (XCR0) ? X86_XSTATE_PKRU_SIZE : \
     (HAS_AVX512 (XCR0) ? X86_XSTATE_AVX512_SIZE : \
      (HAS_MPX (XCR0) ? X86_XSTATE_BNDCFG_SIZE : \
       (HAS_AVX (XCR0) ? X86_XSTATE_AVX_SIZE : X86_XSTATE_SSE_SIZE))))

/* Initial value for fctrl register, as defined in the X86 manual, and
   confirmed in the (Linux) kernel source.  When the x87 floating point
   feature is not enabled in an inferior we use this as the value of the
   fcrtl register.  */

#define I387_FCTRL_INIT_VAL 0x037f

/* Initial value for mxcsr register.  When the avx and sse floating point
   features are not enabled in an inferior we use this as the value of the
   mxcsr register.  */

#define I387_MXCSR_INIT_VAL 0x1f80

#endif /* COMMON_X86_XSTATE_H */