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83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
/* Define the machine-dependent type `jmp_buf'. Alpha version.
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Copyright (C) 1992, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _SETJMP_H
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# error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead."
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#endif
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/* The previous bits/setjmp.h had __jmp_buf defined as a structure.
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We use an array of 'long int' instead, to make writing the
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assembler easier. Naturally, user code should not depend on
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either representation. */
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/*
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* Integer registers:
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* $0 is the return value (va);
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* $1-$8, $22-$25, $28 are call-used (t0-t7, t8-t11, at);
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* $9-$14 we save here (s0-s5);
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* $15 is the FP and we save it here (fp or s6);
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* $16-$21 are input arguments (call-used) (a0-a5);
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* $26 is the return PC and we save it here (ra);
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* $27 is the procedure value (i.e., the address of __setjmp) (pv or t12);
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* $29 is the global pointer, which the caller will reconstruct
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* from the return address restored in $26 (gp);
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* $30 is the stack pointer and we save it here (sp);
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* $31 is always zero (zero).
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*
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* Floating-point registers:
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* $f0 is the floating return value;
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* $f1, $f10-$f15, $f22-$f30 are call-used;
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* $f2-$f9 we save here;
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* $f16-$21 are input args (call-used);
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* $f31 is always zero.
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*
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* Note that even on Alpha hardware that does not have an FPU (there
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* isn't such a thing currently) it is required to implement the FP
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* registers.
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*/
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#if defined __USE_MISC || defined __ASSEMBLY__
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# define JB_S0 0
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# define JB_S1 1
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# define JB_S2 2
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# define JB_S3 3
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# define JB_S4 4
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# define JB_S5 5
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# define JB_PC 6
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# define JB_FP 7
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# define JB_SP 8
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# define JB_F2 9
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# define JB_F3 10
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# define JB_F4 11
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# define JB_F5 12
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# define JB_F6 13
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# define JB_F7 14
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# define JB_F8 15
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# define JB_F9 16
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#endif
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#ifndef __ASSEMBLY__
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typedef long int __jmp_buf[17];
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/* Test if longjmp to JMPBUF would unwind the frame containing a local
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variable at ADDRESS. */
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#define _JMPBUF_UNWINDS(_jmpbuf, _address) \
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((void *)(_address) < (void *)((_jmpbuf)[JB_SP]))
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#endif
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