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1 | /* Define the machine-dependent type `jmp_buf'. Alpha version. | |
2 | Copyright (C) 1992-2019 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
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, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #ifndef _BITS_SETJMP_H | |
20 | #define _BITS_SETJMP_H 1 | |
21 | ||
22 | #if !defined _SETJMP_H && !defined _PTHREAD_H | |
23 | # error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead." | |
24 | #endif | |
25 | ||
26 | /* The previous bits/setjmp.h had __jmp_buf defined as a structure. | |
27 | We use an array of 'long int' instead, to make writing the | |
28 | assembler easier. Naturally, user code should not depend on | |
29 | either representation. */ | |
30 | ||
31 | /* | |
32 | * Integer registers: | |
33 | * $0 is the return value (va); | |
34 | * $1-$8, $22-$25, $28 are call-used (t0-t7, t8-t11, at); | |
35 | * $9-$14 we save here (s0-s5); | |
36 | * $15 is the FP and we save it here (fp or s6); | |
37 | * $16-$21 are input arguments (call-used) (a0-a5); | |
38 | * $26 is the return PC and we save it here (ra); | |
39 | * $27 is the procedure value (i.e., the address of __setjmp) (pv or t12); | |
40 | * $29 is the global pointer, which the caller will reconstruct | |
41 | * from the return address restored in $26 (gp); | |
42 | * $30 is the stack pointer and we save it here (sp); | |
43 | * $31 is always zero (zero). | |
44 | * | |
45 | * Floating-point registers: | |
46 | * $f0 is the floating return value; | |
47 | * $f1, $f10-$f15, $f22-$f30 are call-used; | |
48 | * $f2-$f9 we save here; | |
49 | * $f16-$21 are input args (call-used); | |
50 | * $f31 is always zero. | |
51 | * | |
52 | * Note that even on Alpha hardware that does not have an FPU (there | |
53 | * isn't such a thing currently) it is required to implement the FP | |
54 | * registers. | |
55 | */ | |
56 | ||
57 | #ifndef __ASSEMBLY__ | |
58 | typedef long int __jmp_buf[17]; | |
59 | #endif | |
60 | ||
61 | #endif /* bits/setjmp.h */ |