sysdeps/mips/mips64/__longjmp.c

   1 /* Copyright (C) 1992, 1995, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Brendan Kehoe (brendan@zen.org).
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <setjmp.h>
  21 #include <stdlib.h>
  22
  23 #undef __longjmp
  24
  25 #ifndef __GNUC__
  26   #error This file uses GNU C extensions; you must compile with GCC.
  27 #endif
  28
  29 void
  30 __longjmp (env, val_arg)
  31      __jmp_buf env;
  32      int val_arg;
  33 {
  34   /* gcc 1.39.19 miscompiled the longjmp routine (as it did setjmp before
  35      the hack around it); force it to use $a1 for the longjmp value.
  36      Without this it saves $a1 in a register which gets clobbered
  37      along the way.  */
  38   register int val asm ("a1");
  39
  40   /* Pull back the floating point callee-saved registers.  */
  41   asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[0]));
  42   asm volatile ("l.d $f25, %0" : : "m" (env[0].__fpregs[1]));
  43   asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[2]));
  44   asm volatile ("l.d $f27, %0" : : "m" (env[0].__fpregs[3]));
  45   asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
  46   asm volatile ("l.d $f29, %0" : : "m" (env[0].__fpregs[5]));
  47   asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[6]));
  48   asm volatile ("l.d $f31, %0" : : "m" (env[0].__fpregs[7]));
  49
  50   /* Restore the stack pointer.  */
  51   asm volatile ("ld $29, %0" : : "m" (env[0].__sp));
  52
  53   /* Get and reconstruct the floating point csr.  */
  54   asm volatile ("lw $2, %0" : : "m" (env[0].__fpc_csr));
  55   asm volatile ("ctc1 $2, $31");
  56
  57   /* Get the FP.  */
  58   asm volatile ("ld $30, %0" : : "m" (env[0].__fp));
  59
  60   /* Get the GP. */
  61   asm volatile ("ld $gp, %0" : : "m" (env[0].__gp));
  62
  63   /* Get the callee-saved registers.  */
  64   asm volatile ("ld $16, %0" : : "m" (env[0].__regs[0]));
  65   asm volatile ("ld $17, %0" : : "m" (env[0].__regs[1]));
  66   asm volatile ("ld $18, %0" : : "m" (env[0].__regs[2]));
  67   asm volatile ("ld $19, %0" : : "m" (env[0].__regs[3]));
  68   asm volatile ("ld $20, %0" : : "m" (env[0].__regs[4]));
  69   asm volatile ("ld $21, %0" : : "m" (env[0].__regs[5]));
  70   asm volatile ("ld $22, %0" : : "m" (env[0].__regs[6]));
  71   asm volatile ("ld $23, %0" : : "m" (env[0].__regs[7]));
  72
  73   /* Get the PC.  */
  74   asm volatile ("ld $31, %0" : : "m" (env[0].__pc));
  75
  76   /* Give setjmp 1 if given a 0, or what they gave us if non-zero.  */
  77   if (val == 0)
  78     asm volatile ("dli $2, 1");
  79   else
  80     asm volatile ("move $2, %0" : : "r" (val));
  81
  82   asm volatile ("j $31");
  83
  84   abort ();
  85 }