1 /* Define the machine-dependent type `jmp_buf'. Alpha version.
2 Copyright (C) 1992, 1997 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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 /* The previous bits/setjmp.h had __jmp_buf defined as a structure.
21 We use an array of 'long int' instead, to make writing the
22 assembler easier. Naturally, user code should not depend on
23 either representation. */
27 * $0 is the return value (va);
28 * $1-$8, $22-$25, $28 are call-used (t0-t7, t8-t11, at);
29 * $9-$14 we save here (s0-s5);
30 * $15 is the FP and we save it here (fp or s6);
31 * $16-$21 are input arguments (call-used) (a0-a5);
32 * $26 is the return PC and we save it here (ra);
33 * $27 is the procedure value (i.e., the address of __setjmp) (pv or t12);
34 * $29 is the global pointer, which the caller will reconstruct
35 * from the return address restored in $26 (gp);
36 * $30 is the stack pointer and we save it here (sp);
37 * $31 is always zero (zero).
39 * Floating-point registers:
40 * $f0 is the floating return value;
41 * $f1, $f10-$f15, $f22-$f30 are call-used;
42 * $f2-$f9 we save here;
43 * $f16-$21 are input args (call-used);
44 * $f31 is always zero.
46 * Note that even on Alpha hardware that does not have an FPU (there
47 * isn't such a thing currently) it is required to implement the FP
51 #if defined(__USE_MISC) || defined(__ASSEMBLY__)
72 typedef long int __jmp_buf[17];