1 /* Define the machine-dependent type `jmp_buf'. Alpha version. 2 Copyright (C) 1992-2022 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 */ 62