aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/alpha/bits/setjmp.h
blob: 9aa30463d646980a250b6b4ff9037272b4df2ef9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
/* Define the machine-dependent type `jmp_buf'.  Alpha version.
   Copyright (C) 1992, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/* The previous bits/setjmp.h had __jmp_buf defined as a structure.
   We use an array of 'long int' instead, to make writing the
   assembler easier. Naturally, user code should not depend on
   either representation. */

/*
 * Integer registers:
 *    $0 is the return value (va);
 *    $1-$8, $22-$25, $28 are call-used (t0-t7, t8-t11, at);
 *    $9-$14 we save here (s0-s5);
 *    $15 is the FP and we save it here (fp or s6);
 *    $16-$21 are input arguments (call-used) (a0-a5);
 *    $26 is the return PC and we save it here (ra);
 *    $27 is the procedure value (i.e., the address of __setjmp) (pv or t12);
 *    $29 is the global pointer, which the caller will reconstruct
 *        from the return address restored in $26 (gp);
 *    $30 is the stack pointer and we save it here (sp);
 *    $31 is always zero (zero).
 *
 * Floating-point registers:
 *    $f0 is the floating return value;
 *    $f1, $f10-$f15, $f22-$f30 are call-used;
 *    $f2-$f9 we save here;
 *    $f16-$21 are input args (call-used);
 *    $f31 is always zero.
 *
 * Note that even on Alpha hardware that does not have an FPU (there
 * isn't such a thing currently) it is required to implement the FP
 * registers.
 */

#if defined(__USE_MISC) || defined(__ASSEMBLY__)
#define JB_S0  0
#define JB_S1  1
#define JB_S2  2
#define JB_S3  3
#define JB_S4  4
#define JB_S5  5
#define JB_PC  6
#define JB_FP  7
#define JB_SP  8
#define JB_F2  9
#define JB_F3  10
#define JB_F4  11
#define JB_F5  12
#define JB_F6  13
#define JB_F7  14
#define JB_F8  15
#define JB_F9  16
#endif

#ifndef __ASSEMBLY__
typedef long int __jmp_buf[17];
#endif