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  #include <sgidefs.h>
      20  
      21  /* This function is only called via the assembly language routine
      22     __sigsetjmp, which arranges to pass in the stack pointer and the frame
      23     pointer.  We do things this way because it's difficult to reliably
      24     access them in C.  */
      25  
      26  /* Stack protection is disabled to avoid changing s0 (or any other
      27     caller-save register) before storing it to environment.
      28     See BZ #22624.  */
      29  
      30  int
      31  inhibit_stack_protector
      32  __sigsetjmp_aux (jmp_buf env, int savemask, long long sp, long long fp,
      33  		 long long gp)
      34  {
      35  #ifdef __mips_hard_float
      36    /* Store the floating point callee-saved registers...  */
      37  #if _MIPS_SIM == _ABI64
      38    asm volatile ("s.d $f24, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
      39    asm volatile ("s.d $f25, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[1]));
      40    asm volatile ("s.d $f26, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[2]));
      41    asm volatile ("s.d $f27, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[3]));
      42    asm volatile ("s.d $f28, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[4]));
      43    asm volatile ("s.d $f29, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[5]));
      44    asm volatile ("s.d $f30, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[6]));
      45    asm volatile ("s.d $f31, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[7]));
      46  #else
      47    asm volatile ("s.d $f20, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
      48    asm volatile ("s.d $f22, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[1]));
      49    asm volatile ("s.d $f24, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[2]));
      50    asm volatile ("s.d $f26, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[3]));
      51    asm volatile ("s.d $f28, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[4]));
      52    asm volatile ("s.d $f30, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[5]));
      53  #endif
      54  #endif
      55  
      56    /* .. and the PC;  */
      57    asm volatile ("sd $31, %0" : : "m" (env[0].__jmpbuf[0].__pc));
      58  
      59    /* .. and the stack pointer;  */
      60    env[0].__jmpbuf[0].__sp = sp;
      61  
      62    /* .. and the FP; it'll be in s8. */
      63    env[0].__jmpbuf[0].__fp = fp;
      64  
      65    /* .. and the GP; */
      66    env[0].__jmpbuf[0].__gp = gp;
      67  
      68    /* .. and the callee-saved registers; */
      69    asm volatile ("sd $16, %0" : : "m" (env[0].__jmpbuf[0].__regs[0]));
      70    asm volatile ("sd $17, %0" : : "m" (env[0].__jmpbuf[0].__regs[1]));
      71    asm volatile ("sd $18, %0" : : "m" (env[0].__jmpbuf[0].__regs[2]));
      72    asm volatile ("sd $19, %0" : : "m" (env[0].__jmpbuf[0].__regs[3]));
      73    asm volatile ("sd $20, %0" : : "m" (env[0].__jmpbuf[0].__regs[4]));
      74    asm volatile ("sd $21, %0" : : "m" (env[0].__jmpbuf[0].__regs[5]));
      75    asm volatile ("sd $22, %0" : : "m" (env[0].__jmpbuf[0].__regs[6]));
      76    asm volatile ("sd $23, %0" : : "m" (env[0].__jmpbuf[0].__regs[7]));
      77  
      78    /* Save the signal mask if requested.  */
      79    return __sigjmp_save (env, savemask);
      80  }