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lib: Base riscv64-mes-mescc support. 

* lib/riscv64-mes-mescc/setjmp.c: New file.
(setjmp, longjmp): Implement for RV64.
This commit is contained in:
W. J. van der Laan 2021-04-23 17:20:01 +00:00 committed by Janneke Nieuwenhuizen
parent 58fb0c78f2
commit 9d5613e0af
1 changed files with 47 additions and 0 deletions
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lib/riscv64-mes-mescc/setjmp.c Normal file
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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
* Copyright © 2021 W. J. van der Laan <laanwj@protonmail.com>
*
* This file is part of GNU Mes.
*
* GNU Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* GNU Mes 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include <setjmp.h>
#include <stdlib.h>
void
longjmp (jmp_buf env, int val)
{
val = val == 0 ? 1 : val;
asm ("ld_____%fp,0x10(%fp)"); // env*
asm ("ld_____%t0,0x8(%fp)"); // env.__pc
asm ("ld_____%sp,0x10(%fp)"); // env.__sp
asm ("ld_____%fp,0x0(%fp)"); // env.__bp
asm ("jr_____%t0");
// not reached
exit (42);
}
int
setjmp (__jmp_buf * env)
{
long *p = (long *) &env;
env[0].__bp = p[-2];
env[0].__pc = p[-1];
env[0].__sp = (long) &env;
return 0;
}