module/lua/setjmp/setjmp_aarch64.S

   1 /*-
   2  * Copyright (c) 2014 Andrew Turner
   3  * Copyright (c) 2014-2015 The FreeBSD Foundation
   4  * All rights reserved.
   5  *
   6  * Portions of this software were developed by Andrew Turner
   7  * under sponsorship from the FreeBSD Foundation
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  */
  31
  32
  33 #ifdef __aarch64__
  34
  35 #define ENTRY(sym) \
  36         .text; \
  37         .globl  sym; \
  38         .balign 2; \
  39         .type   sym,#function; \
  40 sym:
  41
  42 #define END(sym) \
  43         .size   sym, . - sym
  44
  45
  46 ENTRY(setjmp)
  47         /* Store the stack pointer */
  48         mov     x8, sp
  49         str     x8, [x0], #8
  50
  51         /* Store the general purpose registers and lr */
  52         stp     x19, x20, [x0], #16
  53         stp     x21, x22, [x0], #16
  54         stp     x23, x24, [x0], #16
  55         stp     x25, x26, [x0], #16
  56         stp     x27, x28, [x0], #16
  57         stp     x29, x30, [x0], #16
  58
  59         /* Return value */
  60         mov     x0, #0
  61         ret
  62 END(setjmp)
  63
  64 ENTRY(longjmp)
  65         /* Restore the stack pointer */
  66         ldr     x8, [x0], #8
  67         mov     sp, x8
  68
  69         /* Restore the general purpose registers and lr */
  70         ldp     x19, x20, [x0], #16
  71         ldp     x21, x22, [x0], #16
  72         ldp     x23, x24, [x0], #16
  73         ldp     x25, x26, [x0], #16
  74         ldp     x27, x28, [x0], #16
  75         ldp     x29, x30, [x0], #16
  76
  77         /* Load the return value */
  78         mov     x0, x1
  79         ret
  80 END(longjmp)
  81
  82 #ifdef __ELF__
  83 .section .note.GNU-stack,"",%progbits
  84 #endif
  85
  86 #endif /* __aarch64__ */