sysdeps/mips/setjmp_aux.c

   1 /* Copyright (C) 1996, 1997 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <setjmp.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 int
  28 __sigsetjmp_aux (jmp_buf env, int savemask, int sp, int fp)
  29 {
  30   /* Store the floating point callee-saved registers...  */
  31   asm volatile ("s.d $f20, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
  32   asm volatile ("s.d $f22, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[1]));
  33   asm volatile ("s.d $f24, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[2]));
  34   asm volatile ("s.d $f26, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[3]));
  35   asm volatile ("s.d $f28, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[4]));
  36   asm volatile ("s.d $f30, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[5]));
  37
  38   /* .. and the PC;  */
  39   asm volatile ("sw $31, %0" : : "m" (env[0].__jmpbuf[0].__pc));
  40
  41   /* .. and the stack pointer;  */
  42   env[0].__jmpbuf[0].__sp = sp;
  43
  44   /* .. and the FP; it'll be in s8. */
  45   env[0].__jmpbuf[0].__fp = fp;
  46
  47   /* .. and the GP; */
  48   asm volatile ("sw $gp, %0" : : "m" (env[0].__jmpbuf[0].__gp));
  49
  50   /* .. and the callee-saved registers; */
  51   asm volatile ("sw $16, %0" : : "m" (env[0].__jmpbuf[0].__regs[0]));
  52   asm volatile ("sw $17, %0" : : "m" (env[0].__jmpbuf[0].__regs[1]));
  53   asm volatile ("sw $18, %0" : : "m" (env[0].__jmpbuf[0].__regs[2]));
  54   asm volatile ("sw $19, %0" : : "m" (env[0].__jmpbuf[0].__regs[3]));
  55   asm volatile ("sw $20, %0" : : "m" (env[0].__jmpbuf[0].__regs[4]));
  56   asm volatile ("sw $21, %0" : : "m" (env[0].__jmpbuf[0].__regs[5]));
  57   asm volatile ("sw $22, %0" : : "m" (env[0].__jmpbuf[0].__regs[6]));
  58   asm volatile ("sw $23, %0" : : "m" (env[0].__jmpbuf[0].__regs[7]));
  59
  60   /* .. and finally get and reconstruct the floating point csr.  */
  61   asm ("cfc1 %0, $31" : "=r" (env[0].__jmpbuf[0].__fpc_csr));
  62
  63   /* Save the signal mask if requested.  */
  64   return __sigjmp_save (env, savemask);
  65 }