sysdeps/mips/mips64/setjmp_aux.c

   1 /* Copyright (C) 1996-2019 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
  22 /* This function is only called via the assembly language routine
  23    __sigsetjmp, which arranges to pass in the stack pointer and the frame
  24    pointer.  We do things this way because it's difficult to reliably
  25    access them in C.  */
  26
  27 /* Stack protection is disabled to avoid changing s0 (or any other
  28    caller-save register) before storing it to environment.
  29    See BZ #22624.  */
  30
  31 int
  32 inhibit_stack_protector
  33 __sigsetjmp_aux (jmp_buf env, int savemask, long long sp, long long fp,
  34                  long long gp)
  35 {
  36 #ifdef __mips_hard_float
  37   /* Store the floating point callee-saved registers...  */
  38 #if _MIPS_SIM == _ABI64
  39   asm volatile ("s.d $f24, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
  40   asm volatile ("s.d $f25, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[1]));
  41   asm volatile ("s.d $f26, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[2]));
  42   asm volatile ("s.d $f27, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[3]));
  43   asm volatile ("s.d $f28, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[4]));
  44   asm volatile ("s.d $f29, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[5]));
  45   asm volatile ("s.d $f30, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[6]));
  46   asm volatile ("s.d $f31, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[7]));
  47 #else
  48   asm volatile ("s.d $f20, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
  49   asm volatile ("s.d $f22, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[1]));
  50   asm volatile ("s.d $f24, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[2]));
  51   asm volatile ("s.d $f26, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[3]));
  52   asm volatile ("s.d $f28, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[4]));
  53   asm volatile ("s.d $f30, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[5]));
  54 #endif
  55 #endif
  56
  57   /* .. and the PC;  */
  58   asm volatile ("sd $31, %0" : : "m" (env[0].__jmpbuf[0].__pc));
  59
  60   /* .. and the stack pointer;  */
  61   env[0].__jmpbuf[0].__sp = sp;
  62
  63   /* .. and the FP; it'll be in s8. */
  64   env[0].__jmpbuf[0].__fp = fp;
  65
  66   /* .. and the GP; */
  67   env[0].__jmpbuf[0].__gp = gp;
  68
  69   /* .. and the callee-saved registers; */
  70   asm volatile ("sd $16, %0" : : "m" (env[0].__jmpbuf[0].__regs[0]));
  71   asm volatile ("sd $17, %0" : : "m" (env[0].__jmpbuf[0].__regs[1]));
  72   asm volatile ("sd $18, %0" : : "m" (env[0].__jmpbuf[0].__regs[2]));
  73   asm volatile ("sd $19, %0" : : "m" (env[0].__jmpbuf[0].__regs[3]));
  74   asm volatile ("sd $20, %0" : : "m" (env[0].__jmpbuf[0].__regs[4]));
  75   asm volatile ("sd $21, %0" : : "m" (env[0].__jmpbuf[0].__regs[5]));
  76   asm volatile ("sd $22, %0" : : "m" (env[0].__jmpbuf[0].__regs[6]));
  77   asm volatile ("sd $23, %0" : : "m" (env[0].__jmpbuf[0].__regs[7]));
  78
  79   /* Save the signal mask if requested.  */
  80   return __sigjmp_save (env, savemask);
  81 }