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      1 /* AArch64 asm definitions.
      2    Copyright (C) 2023-2024 Free Software Foundation, Inc.
      3 
      4    This file is part of GCC.
      5 
      6    GCC is free software; you can redistribute it and/or modify it
      7    under the terms of the GNU General Public License as published
      8    by the Free Software Foundation; either version 3, or (at your
      9    option) any later version.
     10 
     11    GCC is distributed in the hope that it will be useful, but WITHOUT
     12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
     13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
     14    License for more details.
     15 
     16    Under Section 7 of GPL version 3, you are granted additional
     17    permissions described in the GCC Runtime Library Exception, version
     18    3.1, as published by the Free Software Foundation.
     19 
     20    You should have received a copy of the GNU General Public License and
     21    a copy of the GCC Runtime Library Exception along with this program;
     22    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     23    <http://www.gnu.org/licenses/>.  */
     24 
     25 #include "auto-target.h"
     26 
     27 #define L(label) .L ## label
     28 
     29 /* Marking variant PCS symbol references is important for PLT calls
     30    otherwise it is for documenting the PCS in the symbol table.  */
     31 #ifdef HAVE_AS_VARIANT_PCS
     32 # define variant_pcs(name) .variant_pcs name
     33 #else
     34 # define variant_pcs(name)
     35 #endif
     36 
     37 /* GNU_PROPERTY_AARCH64_* macros from elf.h for use in asm code.  */
     38 #define FEATURE_1_AND 0xc0000000
     39 #define FEATURE_1_BTI 1
     40 #define FEATURE_1_PAC 2
     41 
     42 /* Supported features based on the code generation options.  */
     43 #if defined(__ARM_FEATURE_BTI_DEFAULT)
     44 # define BTI_FLAG FEATURE_1_BTI
     45 # define BTI_C hint	34
     46 #else
     47 # define BTI_FLAG 0
     48 # define BTI_C
     49 #endif
     50 
     51 #if __ARM_FEATURE_PAC_DEFAULT & 3
     52 # define PAC_FLAG FEATURE_1_PAC
     53 # define PACIASP hint	25; .cfi_window_save
     54 # define AUTIASP hint	29; .cfi_window_save
     55 #else
     56 # define PAC_FLAG 0
     57 # define PACIASP
     58 # define AUTIASP
     59 #endif
     60 
     61 #ifdef __ELF__
     62 #define HIDDEN(name) .hidden name
     63 #define SYMBOL_SIZE(name) .size name, .-name
     64 #define SYMBOL_TYPE(name, _type) .type name, _type
     65 #else
     66 #define HIDDEN(name)
     67 #define SYMBOL_SIZE(name)
     68 #define SYMBOL_TYPE(name, _type)
     69 #endif
     70 
     71 /* Add a NT_GNU_PROPERTY_TYPE_0 note.  */
     72 #define GNU_PROPERTY(type, value)	\
     73   .section .note.gnu.property, "a";	\
     74   .p2align 3;				\
     75   .word 4;				\
     76   .word 16;				\
     77   .word 5;				\
     78   .asciz "GNU";				\
     79   .word type;				\
     80   .word 4;				\
     81   .word value;				\
     82   .word 0;				\
     83   .previous
     84 
     85 #if defined(__linux__) || defined(__FreeBSD__)
     86 /* Do not require executable stack.  */
     87 .section .note.GNU-stack, "", %progbits
     88 .previous
     89 
     90 /* Add GNU property note if built with branch protection.  */
     91 # if (BTI_FLAG|PAC_FLAG) != 0
     92 GNU_PROPERTY (FEATURE_1_AND, BTI_FLAG|PAC_FLAG)
     93 # endif
     94 #endif
     95 
     96 #define ENTRY_ALIGN(name, align) \
     97   .global name;		\
     98   SYMBOL_TYPE(name, %function);		\
     99   .balign align;	\
    100   name:			\
    101   .cfi_startproc;	\
    102   BTI_C
    103 
    104 #define ENTRY(name) ENTRY_ALIGN(name, 16)
    105 
    106 #define END(name) \
    107   .cfi_endproc;		\
    108   SYMBOL_SIZE(name)
    109