newlib/libc/machine/crx/setjmp.S

   1  ##############################################################################
   2  # setjmp.S -- CRX setjmp routine                                             #
   3  #                                                                            #
   4  # Copyright (c) 2004 National Semiconductor Corporation                      #
   5  #                                                                            #
   6  # The authors hereby grant permission to use, copy, modify, distribute,      #
   7  # and license this software and its documentation for any purpose, provided  #
   8  # that existing copyright notices are retained in all copies and that this   #
   9  # notice is included verbatim in any distributions. No written agreement,    #
  10  # license, or royalty fee is required for any of the authorized uses.        #
  11  # Modifications to this software may be copyrighted by their authors         #
  12  # and need not follow the licensing terms described here, provided that      #
  13  # the new terms are clearly indicated on the first page of each file where   #
  14  # they apply.                                                                #
  15  #                                                                            #
  16  # C library -- setjmp, longjmp                                               #
  17  # longjmp(a,v)                                                               #
  18  # will generate a "return(v)"                                                #
  19  # from the last call to                                                      #
  20  # setjmp(a)                                                                  #
  21  # by restoring r7-ra, sp,                                                    #
  22  # and pc from 'a'                                                            #
  23  # and doing a return. (Makes sure that longjmp never returns 0).             #
  24  ##############################################################################
  25
  26         .text
  27         .file   "setjmp.s"
  28         .align 4
  29
  30         .globl _setjmp
  31         .align 4
  32 _setjmp:
  33         #r2: .blkw
  34         storm r2,{r7,r8,r9,r10,r11,r12,r13,r14}
  35         stord sp,0(r2)
  36         movd  $0,r0
  37         jump  ra
  38
  39         .globl _longjmp
  40 _longjmp:
  41         #r2: .blkw # pointer save area
  42         #r3: .blkw # ret vlaue
  43         loadm r2, {r7,r8,r9,r10,r11,r12,r13,ra}
  44         loadd 0(r2), sp
  45         movd r3, r0
  46         cmpd $0, r3
  47         bne end1
  48         movd $1, r0
  49 end1:
  50         jump ra
  51         .align 4