ports/sysdeps/mips/mips64/__longjmp.c

   1 /* Copyright (C) 1992-2014 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <setjmp.h>
  20 #include <sgidefs.h>
  21 #include <stdlib.h>
  22
  23 #ifndef __GNUC__
  24   #error This file uses GNU C extensions; you must compile with GCC.
  25 #endif
  26
  27 void
  28 __longjmp (env_arg, val_arg)
  29      __jmp_buf env_arg;
  30      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 struct __jmp_buf_internal_tag *env asm ("a0");
  37   register int val asm ("a1");
  38 #ifdef CHECK_SP
  39   register long long sp asm ("$29");
  40   CHECK_SP (env[0].__sp, sp, long long);
  41 #endif
  42
  43 #ifdef __mips_hard_float
  44   /* Pull back the floating point callee-saved registers.  */
  45 #if _MIPS_SIM == _ABI64
  46   asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[0]));
  47   asm volatile ("l.d $f25, %0" : : "m" (env[0].__fpregs[1]));
  48   asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[2]));
  49   asm volatile ("l.d $f27, %0" : : "m" (env[0].__fpregs[3]));
  50   asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
  51   asm volatile ("l.d $f29, %0" : : "m" (env[0].__fpregs[5]));
  52   asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[6]));
  53   asm volatile ("l.d $f31, %0" : : "m" (env[0].__fpregs[7]));
  54 #else
  55   asm volatile ("l.d $f20, %0" : : "m" (env[0].__fpregs[0]));
  56   asm volatile ("l.d $f22, %0" : : "m" (env[0].__fpregs[1]));
  57   asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[2]));
  58   asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[3]));
  59   asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
  60   asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[5]));
  61 #endif
  62 #endif
  63
  64   /* Get the GP. */
  65   asm volatile ("ld $gp, %0" : : "m" (env[0].__gp));
  66
  67   /* Get the callee-saved registers.  */
  68   asm volatile ("ld $16, %0" : : "m" (env[0].__regs[0]));
  69   asm volatile ("ld $17, %0" : : "m" (env[0].__regs[1]));
  70   asm volatile ("ld $18, %0" : : "m" (env[0].__regs[2]));
  71   asm volatile ("ld $19, %0" : : "m" (env[0].__regs[3]));
  72   asm volatile ("ld $20, %0" : : "m" (env[0].__regs[4]));
  73   asm volatile ("ld $21, %0" : : "m" (env[0].__regs[5]));
  74   asm volatile ("ld $22, %0" : : "m" (env[0].__regs[6]));
  75   asm volatile ("ld $23, %0" : : "m" (env[0].__regs[7]));
  76
  77   /* Get the PC.  */
  78   asm volatile ("ld $31, %0" : : "m" (env[0].__pc));
  79
  80
  81   /* Restore the stack pointer and the FP.  They have to be restored
  82      last and in a single asm as gcc, depending on options used, may
  83      use either of them to access env.  */
  84   asm volatile ("ld $29, %0\n\t"
  85                 "ld $30, %1\n\t" : : "m" (env[0].__sp), "m" (env[0].__fp));
  86
  87 /* Give setjmp 1 if given a 0, or what they gave us if non-zero.  */
  88   if (val == 0)
  89     asm volatile ("dli $2, 1");
  90   else
  91     asm volatile ("move $2, %0" : : "r" (val));
  92
  93   asm volatile ("j $31");
  94
  95   /* Avoid `volatile function does return' warnings.  */
  96   for (;;);
  97 }