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[glibc.git] / sysdeps / mips / setjmp_aux.c
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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).
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.
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.
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. */
20 #include <setjmp.h>
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. */
27 int
28 __sigsetjmp_aux (jmp_buf env, int savemask, int sp, int fp)
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]));
38 /* .. and the PC; */
39 asm volatile ("sw $31, %0" : : "m" (env[0].__jmpbuf[0].__pc));
41 /* .. and the stack pointer; */
42 env[0].__jmpbuf[0].__sp = sp;
44 /* .. and the FP; it'll be in s8. */
45 env[0].__jmpbuf[0].__fp = fp;
47 /* .. and the GP; */
48 asm volatile ("sw $gp, %0" : : "m" (env[0].__jmpbuf[0].__gp));
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]));
60 /* .. and finally get and reconstruct the floating point csr. */
61 asm ("cfc1 %0, $31" : "=r" (env[0].__jmpbuf[0].__fpc_csr));
63 /* Save the signal mask if requested. */
64 return __sigjmp_save (env, savemask);