1  /* Copyright (C) 1992-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the 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     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library.  If not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <setjmp.h>
      19  #include <sgidefs.h>
      20  #include <stdlib.h>
      21  
      22  #ifndef	__GNUC__
      23    #error This file uses GNU C extensions; you must compile with GCC.
      24  #endif
      25  
      26  void
      27  __longjmp (__jmp_buf env_arg, int val_arg)
      28  {
      29    /* gcc 1.39.19 miscompiled the longjmp routine (as it did setjmp before
      30       the hack around it); force it to use $a1 for the longjmp value.
      31       Without this it saves $a1 in a register which gets clobbered
      32       along the way.  */
      33    register struct __jmp_buf_internal_tag *env asm ("a0");
      34    register int val asm ("a1");
      35  #ifdef CHECK_SP
      36    register long long sp asm ("$29");
      37    CHECK_SP (env[0].__sp, sp, long long);
      38  #endif
      39  
      40  #ifdef __mips_hard_float
      41    /* Pull back the floating point callee-saved registers.  */
      42  #if _MIPS_SIM == _ABI64
      43    asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[0]));
      44    asm volatile ("l.d $f25, %0" : : "m" (env[0].__fpregs[1]));
      45    asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[2]));
      46    asm volatile ("l.d $f27, %0" : : "m" (env[0].__fpregs[3]));
      47    asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
      48    asm volatile ("l.d $f29, %0" : : "m" (env[0].__fpregs[5]));
      49    asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[6]));
      50    asm volatile ("l.d $f31, %0" : : "m" (env[0].__fpregs[7]));
      51  #else
      52    asm volatile ("l.d $f20, %0" : : "m" (env[0].__fpregs[0]));
      53    asm volatile ("l.d $f22, %0" : : "m" (env[0].__fpregs[1]));
      54    asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[2]));
      55    asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[3]));
      56    asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
      57    asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[5]));
      58  #endif
      59  #endif
      60  
      61    /* Get the GP. */
      62    asm volatile ("ld $gp, %0" : : "m" (env[0].__gp));
      63  
      64    /* Get the callee-saved registers.  */
      65    asm volatile ("ld $16, %0" : : "m" (env[0].__regs[0]));
      66    asm volatile ("ld $17, %0" : : "m" (env[0].__regs[1]));
      67    asm volatile ("ld $18, %0" : : "m" (env[0].__regs[2]));
      68    asm volatile ("ld $19, %0" : : "m" (env[0].__regs[3]));
      69    asm volatile ("ld $20, %0" : : "m" (env[0].__regs[4]));
      70    asm volatile ("ld $21, %0" : : "m" (env[0].__regs[5]));
      71    asm volatile ("ld $22, %0" : : "m" (env[0].__regs[6]));
      72    asm volatile ("ld $23, %0" : : "m" (env[0].__regs[7]));
      73  
      74    /* Get the PC.  */
      75    asm volatile ("ld $31, %0" : : "m" (env[0].__pc));
      76  
      77  
      78    /* Restore the stack pointer and the FP.  They have to be restored
      79       last and in a single asm as gcc, depending on options used, may
      80       use either of them to access env.  */
      81    asm volatile ("ld $29, %0\n\t"
      82  		"ld $30, %1\n\t" : : "m" (env[0].__sp), "m" (env[0].__fp));
      83  
      84  /* Give setjmp 1 if given a 0, or what they gave us if non-zero.  */
      85    if (val == 0)
      86      asm volatile ("dli $2, 1");
      87    else
      88      asm volatile ("move $2, %0" : : "r" (val));
      89  
      90    asm volatile ("j $31");
      91  
      92    /* Avoid `volatile function does return' warnings.  */
      93    for (;;);
      94  }