sysdeps/mips/setjmp_aux.c

   1 /* Copyright (C) 1992, 1994, 1995 Free Software Foundation, Inc.
   2    Contributed by Brendan Kehoe (brendan@zen.org).
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <setjmp.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 int
  27 __sigsetjmp_aux (jmp_buf env, int savemask, int sp, int fp)
  28 {
  29   /* Store the floating point callee-saved registers...  */
  30   asm volatile ("s.d $f20, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
  31   asm volatile ("s.d $f22, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[1]));
  32   asm volatile ("s.d $f24, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[2]));
  33   asm volatile ("s.d $f26, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[3]));
  34   asm volatile ("s.d $f28, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[4]));
  35   asm volatile ("s.d $f30, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[5]));
  36
  37   /* .. and the PC;  */
  38   asm volatile ("sw $31, %0" : : "m" (env[0].__jmpbuf[0].__pc));
  39
  40   /* .. and the stack pointer;  */
  41   env[0].__jmpbuf[0].__sp = sp;
  42
  43   /* .. and the FP; it'll be in s8. */
  44   env[0].__jmpbuf[0].__fp = fp;
  45
  46   /* .. and the GP; */
  47   asm volatile ("sw $gp, %0" : : "m" (env[0].__jmpbuf[0].__gp));
  48
  49   /* .. and the callee-saved registers; */
  50   asm volatile ("sw $16, %0" : : "m" (env[0].__jmpbuf[0].__regs[0]));
  51   asm volatile ("sw $17, %0" : : "m" (env[0].__jmpbuf[0].__regs[1]));
  52   asm volatile ("sw $18, %0" : : "m" (env[0].__jmpbuf[0].__regs[2]));
  53   asm volatile ("sw $19, %0" : : "m" (env[0].__jmpbuf[0].__regs[3]));
  54   asm volatile ("sw $20, %0" : : "m" (env[0].__jmpbuf[0].__regs[4]));
  55   asm volatile ("sw $21, %0" : : "m" (env[0].__jmpbuf[0].__regs[5]));
  56   asm volatile ("sw $22, %0" : : "m" (env[0].__jmpbuf[0].__regs[6]));
  57   asm volatile ("sw $23, %0" : : "m" (env[0].__jmpbuf[0].__regs[7]));
  58
  59   /* .. and finally get and reconstruct the floating point csr.  */
  60   asm ("cfc1 %0, $31" : "=r" (env[0].__jmpbuf[0].__fpc_csr));
  61
  62   /* Save the signal mask if requested.  */
  63   return __sigjmp_save (env, savemask);
  64 }