sysdeps/mips/__longjmp.c

   1 /* Copyright (C) 1992, 1995 Free Software Foundation, Inc.
   2    Contributed by Brendan Kehoe (brendan@zen.org).
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  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 DEFUN(__longjmp, (env, val_arg), __jmp_buf env AND int val_arg)
  31 {
  32   /* gcc 1.39.19 miscompiled the longjmp routine (as it did setjmp before
  33      the hack around it); force it to use $a1 for the longjmp value.
  34      Without this it saves $a1 in a register which gets clobbered
  35      along the way.  */
  36   register int val asm ("a1");
  37
  38   /* Pull back the floating point callee-saved registers.  */
  39   asm volatile ("l.d $f20, %0" : : "m" (env[0].__fpregs[0]));
  40   asm volatile ("l.d $f22, %0" : : "m" (env[0].__fpregs[1]));
  41   asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[2]));
  42   asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[3]));
  43   asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
  44   asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[5]));
  45
  46   /* Restore the stack pointer.  */
  47   asm volatile ("lw $29, %0" : : "m" (env[0].__sp));
  48
  49   /* Get and reconstruct the floating point csr.  */
  50   asm volatile ("lw $2, %0" : : "m" (env[0].__fpc_csr));
  51   asm volatile ("ctc1 $2, $31");
  52
  53   /* Get the FP.  */
  54   asm volatile ("lw $30, %0" : : "m" (env[0].__fp));
  55
  56   /* Get the GP. */
  57   asm volatile ("lw $gp, %0" : : "m" (env[0].__gp));
  58
  59   /* Get the callee-saved registers.  */
  60   asm volatile ("lw $16, %0" : : "m" (env[0].__regs[0]));
  61   asm volatile ("lw $17, %0" : : "m" (env[0].__regs[1]));
  62   asm volatile ("lw $18, %0" : : "m" (env[0].__regs[2]));
  63   asm volatile ("lw $19, %0" : : "m" (env[0].__regs[3]));
  64   asm volatile ("lw $20, %0" : : "m" (env[0].__regs[4]));
  65   asm volatile ("lw $21, %0" : : "m" (env[0].__regs[5]));
  66   asm volatile ("lw $22, %0" : : "m" (env[0].__regs[6]));
  67   asm volatile ("lw $23, %0" : : "m" (env[0].__regs[7]));
  68
  69   /* Get the PC.  */
  70   asm volatile ("lw $31, %0" : : "m" (env[0].__pc));
  71
  72   /* Give setjmp 1 if given a 0, or what they gave us if non-zero.  */
  73   if (val == 0)
  74     asm volatile ("li $2, 1");
  75   else
  76     asm volatile ("move $2, %0" : : "r" (val));
  77
  78   asm volatile ("j $31");
  79
  80   abort ();
  81 }