1  /* Copyright (C) 1996-2023 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  
      20  /* This function is only called via the assembly language routine
      21     __sigsetjmp, which arranges to pass in the stack pointer and the frame
      22     pointer.  We do things this way because it's difficult to reliably
      23     access them in C.  */
      24  
      25  /* Stack protection is disabled to avoid changing s0 (or any other
      26     caller-save register) before storing it to environment.
      27     See BZ #22624.  */
      28  
      29  int __attribute__ ((nomips16))
      30  inhibit_stack_protector
      31  __sigsetjmp_aux (jmp_buf env, int savemask, int sp, int fp)
      32  {
      33  #ifdef __mips_hard_float
      34    /* Store the floating point callee-saved registers...  */
      35    asm volatile ("s.d $f20, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
      36    asm volatile ("s.d $f22, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[1]));
      37    asm volatile ("s.d $f24, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[2]));
      38    asm volatile ("s.d $f26, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[3]));
      39    asm volatile ("s.d $f28, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[4]));
      40    asm volatile ("s.d $f30, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[5]));
      41  #endif
      42  
      43    /* .. and the PC;  */
      44    asm volatile ("sw $31, %0" : : "m" (env[0].__jmpbuf[0].__pc));
      45  
      46    /* .. and the stack pointer;  */
      47    env[0].__jmpbuf[0].__sp = (void *) sp;
      48  
      49    /* .. and the FP; it'll be in s8. */
      50    env[0].__jmpbuf[0].__fp = (void *) fp;
      51  
      52    /* .. and the GP; */
      53    asm volatile ("sw $gp, %0" : : "m" (env[0].__jmpbuf[0].__gp));
      54  
      55    /* .. and the callee-saved registers; */
      56    asm volatile ("sw $16, %0" : : "m" (env[0].__jmpbuf[0].__regs[0]));
      57    asm volatile ("sw $17, %0" : : "m" (env[0].__jmpbuf[0].__regs[1]));
      58    asm volatile ("sw $18, %0" : : "m" (env[0].__jmpbuf[0].__regs[2]));
      59    asm volatile ("sw $19, %0" : : "m" (env[0].__jmpbuf[0].__regs[3]));
      60    asm volatile ("sw $20, %0" : : "m" (env[0].__jmpbuf[0].__regs[4]));
      61    asm volatile ("sw $21, %0" : : "m" (env[0].__jmpbuf[0].__regs[5]));
      62    asm volatile ("sw $22, %0" : : "m" (env[0].__jmpbuf[0].__regs[6]));
      63    asm volatile ("sw $23, %0" : : "m" (env[0].__jmpbuf[0].__regs[7]));
      64  
      65    /* Save the signal mask if requested.  */
      66    return __sigjmp_save (env, savemask);
      67  }