sysdeps/mips/mips64/__longjmp.c

   1 /* Copyright (C) 1992, 1995, 1997, 2000, 2003, 2004
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Brendan Kehoe (brendan@zen.org).
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <setjmp.h>
  22 #include <sgidefs.h>
  23 #include <stdlib.h>
  24
  25 #undef __longjmp
  26
  27 #ifndef __GNUC__
  28   #error This file uses GNU C extensions; you must compile with GCC.
  29 #endif
  30
  31 void
  32 __longjmp (env, val_arg)
  33      __jmp_buf env;
  34      int val_arg;
  35 {
  36   /* gcc 1.39.19 miscompiled the longjmp routine (as it did setjmp before
  37      the hack around it); force it to use $a1 for the longjmp value.
  38      Without this it saves $a1 in a register which gets clobbered
  39      along the way.  */
  40   register int val asm ("a1");
  41
  42 #ifdef __mips_hard_float
  43   /* Pull back the floating point callee-saved registers.  */
  44 #if _MIPS_SIM == _ABI64
  45   asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[0]));
  46   asm volatile ("l.d $f25, %0" : : "m" (env[0].__fpregs[1]));
  47   asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[2]));
  48   asm volatile ("l.d $f27, %0" : : "m" (env[0].__fpregs[3]));
  49   asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
  50   asm volatile ("l.d $f29, %0" : : "m" (env[0].__fpregs[5]));
  51   asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[6]));
  52   asm volatile ("l.d $f31, %0" : : "m" (env[0].__fpregs[7]));
  53 #else
  54   asm volatile ("l.d $f20, %0" : : "m" (env[0].__fpregs[0]));
  55   asm volatile ("l.d $f22, %0" : : "m" (env[0].__fpregs[1]));
  56   asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[2]));
  57   asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[3]));
  58   asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
  59   asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[5]));
  60 #endif
  61
  62   /* Get and reconstruct the floating point csr.  */
  63   asm volatile ("lw $2, %0" : : "m" (env[0].__fpc_csr));
  64   asm volatile ("ctc1 $2, $31");
  65 #endif
  66
  67   /* Get the GP. */
  68   asm volatile ("ld $gp, %0" : : "m" (env[0].__gp));
  69
  70   /* Get the callee-saved registers.  */
  71   asm volatile ("ld $16, %0" : : "m" (env[0].__regs[0]));
  72   asm volatile ("ld $17, %0" : : "m" (env[0].__regs[1]));
  73   asm volatile ("ld $18, %0" : : "m" (env[0].__regs[2]));
  74   asm volatile ("ld $19, %0" : : "m" (env[0].__regs[3]));
  75   asm volatile ("ld $20, %0" : : "m" (env[0].__regs[4]));
  76   asm volatile ("ld $21, %0" : : "m" (env[0].__regs[5]));
  77   asm volatile ("ld $22, %0" : : "m" (env[0].__regs[6]));
  78   asm volatile ("ld $23, %0" : : "m" (env[0].__regs[7]));
  79
  80   /* Get the PC.  */
  81   asm volatile ("ld $31, %0" : : "m" (env[0].__pc));
  82
  83
  84   /* Restore the stack pointer and the FP.  They have to be restored
  85      last and in a single asm as gcc, depending on options used, may
  86      use either of them to access env.  */
  87   asm volatile ("ld $29, %0\n\t"
  88                 "ld $30, %1\n\t" : : "m" (env[0].__sp), "m" (env[0].__fp));
  89
  90 /* Give setjmp 1 if given a 0, or what they gave us if non-zero.  */
  91   if (val == 0)
  92     asm volatile ("dli $2, 1");
  93   else
  94     asm volatile ("move $2, %0" : : "r" (val));
  95
  96   asm volatile ("j $31");
  97
  98   /* Avoid `volatile function does return' warnings.  */
  99   for (;;);
 100 }