sysdeps/mips/setjmp_aux.c

   1 /* Copyright (C) 1996, 1997, 2000, 2002, 2003 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    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 #ifdef __mips_hard_float
  31   /* Store the floating point callee-saved registers...  */
  32   asm volatile ("s.d $f20, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
  33   asm volatile ("s.d $f22, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[1]));
  34   asm volatile ("s.d $f24, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[2]));
  35   asm volatile ("s.d $f26, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[3]));
  36   asm volatile ("s.d $f28, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[4]));
  37   asm volatile ("s.d $f30, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[5]));
  38 #endif
  39
  40   /* .. and the PC;  */
  41   asm volatile ("sw $31, %0" : : "m" (env[0].__jmpbuf[0].__pc));
  42
  43   /* .. and the stack pointer;  */
  44   env[0].__jmpbuf[0].__sp = (void *) sp;
  45
  46   /* .. and the FP; it'll be in s8. */
  47   env[0].__jmpbuf[0].__fp = (void *) fp;
  48
  49   /* .. and the GP; */
  50   asm volatile ("sw $gp, %0" : : "m" (env[0].__jmpbuf[0].__gp));
  51
  52   /* .. and the callee-saved registers; */
  53   asm volatile ("sw $16, %0" : : "m" (env[0].__jmpbuf[0].__regs[0]));
  54   asm volatile ("sw $17, %0" : : "m" (env[0].__jmpbuf[0].__regs[1]));
  55   asm volatile ("sw $18, %0" : : "m" (env[0].__jmpbuf[0].__regs[2]));
  56   asm volatile ("sw $19, %0" : : "m" (env[0].__jmpbuf[0].__regs[3]));
  57   asm volatile ("sw $20, %0" : : "m" (env[0].__jmpbuf[0].__regs[4]));
  58   asm volatile ("sw $21, %0" : : "m" (env[0].__jmpbuf[0].__regs[5]));
  59   asm volatile ("sw $22, %0" : : "m" (env[0].__jmpbuf[0].__regs[6]));
  60   asm volatile ("sw $23, %0" : : "m" (env[0].__jmpbuf[0].__regs[7]));
  61
  62 #ifdef __mips_hard_float
  63   /* .. and finally get and reconstruct the floating point csr.  */
  64   asm ("cfc1 %0, $31" : "=r" (env[0].__jmpbuf[0].__fpc_csr));
  65 #endif
  66
  67   /* Save the signal mask if requested.  */
  68   return __sigjmp_save (env, savemask);
  69 }