1  /* ELF program property for x86 ISA level.
       2     Copyright (C) 2020-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     In addition to the permissions in the GNU Lesser General Public
      11     License, the Free Software Foundation gives you unlimited
      12     permission to link the compiled version of this file with other
      13     programs, and to distribute those programs without any restriction
      14     coming from the use of this file.  (The Lesser General Public
      15     License restrictions do apply in other respects; for example, they
      16     cover modification of the file, and distribution when not linked
      17     into another program.)
      18  
      19     The GNU C Library is distributed in the hope that it will be useful,
      20     but WITHOUT ANY WARRANTY; without even the implied warranty of
      21     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      22     Lesser General Public License for more details.
      23  
      24     You should have received a copy of the GNU Lesser General Public
      25     License along with the GNU C Library; if not, see
      26     <https://www.gnu.org/licenses/>.  */
      27  
      28  #include <elf.h>
      29  #include <sysdeps/x86/isa-level.h>
      30  /* ELF program property for x86 ISA level.  */
      31  #ifdef INCLUDE_X86_ISA_LEVEL
      32  # if MINIMUM_X86_ISA_LEVEL >= 1
      33  /* NB: ISAs, excluding MMX, in x86-64 ISA level baseline are used.  */
      34  #  define ISA_BASELINE	GNU_PROPERTY_X86_ISA_1_BASELINE
      35  # else
      36  #  define ISA_BASELINE	0
      37  # endif
      38  
      39  # if MINIMUM_X86_ISA_LEVEL >= 2
      40  /* NB: ISAs in x86-64 ISA level v2 are used.  */
      41  #  define ISA_V2	GNU_PROPERTY_X86_ISA_1_V2
      42  # else
      43  #  define ISA_V2	0
      44  # endif
      45  
      46  # if MINIMUM_X86_ISA_LEVEL >= 3
      47  /* NB: ISAs in x86-64 ISA level v3 are used.  */
      48  #  define ISA_V3	GNU_PROPERTY_X86_ISA_1_V3
      49  # else
      50  #  define ISA_V3	0
      51  # endif
      52  
      53  # if MINIMUM_X86_ISA_LEVEL >= 4
      54  /* NB: ISAs in x86-64 ISA level v4 are used.  */
      55  #  define ISA_V4	GNU_PROPERTY_X86_ISA_1_V4
      56  # else
      57  #  define ISA_V4	0
      58  # endif
      59  
      60  # ifndef ISA_LEVEL
      61  #  define ISA_LEVEL (ISA_BASELINE | ISA_V2 | ISA_V3 | ISA_V4)
      62  # endif
      63  
      64  # if ISA_LEVEL
      65  #  ifdef __LP64__
      66  #   define PROPERTY_ALIGN 3
      67  #  else
      68  #   define PROPERTY_ALIGN 2
      69  #  endif
      70  
      71  #  define note_stringify(arg) note_stringify_1(arg)
      72  #  define note_stringify_1(arg) #arg
      73  
      74  asm(".pushsection \".note.gnu.property\",\"a\",@note\n"
      75  "	.p2align " note_stringify (PROPERTY_ALIGN)
      76  	/* name length.  */
      77  "\n	.long 1f - 0f\n"
      78  	/* data length.  */
      79  "	.long 4f - 1f\n"
      80  	/* note type: NT_GNU_PROPERTY_TYPE_0.  */
      81  "	.long " note_stringify (NT_GNU_PROPERTY_TYPE_0)
      82  	/* vendor name.  */
      83  "\n0:	.asciz \"GNU\"\n"
      84  "1:	.p2align " note_stringify (PROPERTY_ALIGN)
      85  	/* pr_type: GNU_PROPERTY_X86_ISA_1_NEEDED.  */
      86  "\n	.long " note_stringify (GNU_PROPERTY_X86_ISA_1_NEEDED)
      87  	/* pr_datasz.  */
      88  "\n	.long 3f - 2f\n"
      89  	/* GNU_PROPERTY_X86_ISA_1_V[234].  */
      90  "2:\n	 .long " note_stringify (ISA_LEVEL)
      91  "\n3:\n	.p2align " note_stringify (PROPERTY_ALIGN)
      92  "\n4:\n .popsection");
      93  # endif /* ISA_LEVEL */
      94  #endif /* INCLUDE_X86_ISA_LEVEL */