48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
/*-------------------------------------------------------------------------
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setjmp.c - source file for ANSI routines setjmp & longjmp
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Written By - Sandeep Dutta . sandeep.dutta@usa.net (1998)
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This library is free software; you can redistribute it and/or modify it
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under the terms of the GNU Library General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This 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
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GNU Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this program; if not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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In other words, you are welcome to use, share and improve this program.
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You are forbidden to forbid anyone else to use, share and improve
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what you give them. Help stamp out software-hoarding!
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-------------------------------------------------------------------------*/
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#include <8051.h>
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int longjmp (unsigned char *bp, int rv)
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{
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unsigned char lsp;
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lsp = *(bp+2);
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*((unsigned char data *) lsp) = *bp++;
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*((unsigned char data *) lsp - 1) = *bp;
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SP = lsp;
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return rv;
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}
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int setjmp (unsigned char *bp)
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{
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/* registers would have been saved on the
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stack anyway so we need to save SP
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and the return address */
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*bp++ = *((unsigned char data *) SP );
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*bp++ = *((unsigned char data *)SP - 1);
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*bp = SP;
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return 0;
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}
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