libitm/config/aarch64/sjlj.S

   1 /* Copyright (C) 2014-2024 Free Software Foundation, Inc.
   2    Contributed by Richard Henderson <rth@redhat.com>.
   3
   4    This file is part of the GNU Transactional Memory Library (libitm).
   5
   6    Libitm is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
  12    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14    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 "asmcfi.h"
  26
  27 #define BTI_C   hint    34
  28 #define PACIASP hint    25
  29 #define AUTIASP hint    29
  30 #define PACIBSP hint    27
  31 #define AUTIBSP hint    31
  32
  33 #if defined(HAVE_AS_CFI_PSEUDO_OP) && defined(__GCC_HAVE_DWARF2_CFI_ASM)
  34 # define cfi_window_save .cfi_window_save
  35 # define cfi_b_key_frame .cfi_b_key_frame
  36 #else
  37 # define cfi_window_save
  38 # define cfi_b_key_frame
  39 #endif
  40
  41 #if __ARM_FEATURE_PAC_DEFAULT & 1
  42 # define CFI_PAC_TOGGLE cfi_window_save
  43 # define CFI_PAC_KEY
  44 # define PAC_AND_BTI    PACIASP
  45 # define AUT    AUTIASP
  46 #elif __ARM_FEATURE_PAC_DEFAULT & 2
  47 # define CFI_PAC_TOGGLE cfi_window_save
  48 # define CFI_PAC_KEY    cfi_b_key_frame
  49 # define PAC_AND_BTI    PACIBSP
  50 # define AUT    AUTIBSP
  51 #else
  52 # define CFI_PAC_TOGGLE
  53 # define CFI_PAC_KEY
  54 # define PAC_AND_BTI    BTI_C
  55 # define AUT
  56 #endif
  57
  58         .text
  59         .align  2
  60         .global _ITM_beginTransaction
  61         .type   _ITM_beginTransaction, %function
  62
  63 _ITM_beginTransaction:
  64         cfi_startproc
  65         CFI_PAC_KEY
  66         PAC_AND_BTI
  67         CFI_PAC_TOGGLE
  68         mov     x1, sp
  69         stp     x29, x30, [sp, -11*16]!
  70         cfi_adjust_cfa_offset(11*16)
  71         cfi_rel_offset(x29, 0)
  72         cfi_rel_offset(x30, 8)
  73         mov     x29, sp
  74         stp     x19, x20, [sp, 1*16]
  75         stp     x21, x22, [sp, 2*16]
  76         stp     x23, x24, [sp, 3*16]
  77         stp     x25, x26, [sp, 4*16]
  78         stp     x27, x28, [sp, 5*16]
  79         stp     d8, d9,   [sp, 6*16]
  80         stp     d10, d11, [sp, 7*16]
  81         stp     d12, d13, [sp, 8*16]
  82         stp     d14, d15, [sp, 9*16]
  83         str     x1, [sp, 10*16]
  84
  85         /* Invoke GTM_begin_transaction with the struct we just built.  */
  86         mov     x1, sp
  87         bl      GTM_begin_transaction
  88
  89         /* Return; we don't need to restore any of the call-saved regs.  */
  90         ldp     x29, x30, [sp], 11*16
  91         cfi_adjust_cfa_offset(-11*16)
  92         cfi_restore(x29)
  93         cfi_restore(x30)
  94         AUT
  95         CFI_PAC_TOGGLE
  96         ret
  97         cfi_endproc
  98         .size   _ITM_beginTransaction, . - _ITM_beginTransaction
  99
 100         .align  2
 101         .global GTM_longjmp
 102         .hidden GTM_longjmp
 103         .type   GTM_longjmp, %function
 104
 105 GTM_longjmp:
 106         /* The first parameter becomes the return value (x0).
 107            The third parameter is ignored for now.  */
 108         cfi_startproc
 109         CFI_PAC_KEY
 110         BTI_C
 111         ldp     x19, x20, [x1, 1*16]
 112         ldp     x21, x22, [x1, 2*16]
 113         ldp     x23, x24, [x1, 3*16]
 114         ldp     x25, x26, [x1, 4*16]
 115         ldp     x27, x28, [x1, 5*16]
 116         ldp     d8, d9,   [x1, 6*16]
 117         ldp     d10, d11, [x1, 7*16]
 118         ldp     d12, d13, [x1, 8*16]
 119         ldp     d14, d15, [x1, 9*16]
 120         ldr     x3, [x1, 10*16]
 121         ldp     x29, x30, [x1]
 122         cfi_def_cfa(x1, 0)
 123         CFI_PAC_TOGGLE
 124         mov     sp, x3
 125         AUT
 126         CFI_PAC_TOGGLE
 127         br      x30
 128         cfi_endproc
 129         .size   GTM_longjmp, . - GTM_longjmp
 130
 131 /* GNU_PROPERTY_AARCH64_* macros from elf.h for use in asm code.  */
 132 #define FEATURE_1_AND 0xc0000000
 133 #define FEATURE_1_BTI 1
 134 #define FEATURE_1_PAC 2
 135
 136 /* Supported features based on the code generation options.  */
 137 #if defined(__ARM_FEATURE_BTI_DEFAULT)
 138 # define BTI_FLAG FEATURE_1_BTI
 139 #else
 140 # define BTI_FLAG 0
 141 #endif
 142
 143 #if __ARM_FEATURE_PAC_DEFAULT & 3
 144 # define PAC_FLAG FEATURE_1_PAC
 145 #else
 146 # define PAC_FLAG 0
 147 #endif
 148
 149 /* Add a NT_GNU_PROPERTY_TYPE_0 note.  */
 150 #define GNU_PROPERTY(type, value)       \
 151   .section .note.gnu.property, "a";     \
 152   .p2align 3;                           \
 153   .word 4;                              \
 154   .word 16;                             \
 155   .word 5;                              \
 156   .asciz "GNU";                         \
 157   .word type;                           \
 158   .word 4;                              \
 159   .word value;                          \
 160   .word 0;
 161
 162 #if defined(__linux__) || defined(__FreeBSD__)
 163 .section .note.GNU-stack, "", %progbits
 164
 165 /* Add GNU property note if built with branch protection.  */
 166 # if (BTI_FLAG|PAC_FLAG) != 0
 167 GNU_PROPERTY (FEATURE_1_AND, BTI_FLAG|PAC_FLAG)
 168 # endif
 169 #endif