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/* Define the machine-dependent type `jmp_buf'. Alpha version. Copyright (C) 1992,1997,2003,2005,2006 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 Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _BITS_SETJMP_H #define _BITS_SETJMP_H 1 #if !defined _SETJMP_H && !defined _PTHREAD_H # error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead." #endif /* 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. */ typedef long int __jmp_buf[17]; #endif /* bits/setjmp.h */ |