mes/lib/arm-mes-gcc/setjmp.c

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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 © 2019,2020 Danny Milosavljevic <dannym@scratchpost.org>
*
* 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
__attribute__ ((noinline))
longjmp (jmp_buf env, int val)
{
// *INDENT-OFF*
asm (
"mov r0, %0\n\t"
"mov r1, %1\n\t"
"cmp r1, #0\n\t"
"moveq r1, #1\n\t" /* returning 0 is not allowed, even when the user wanted to. */
"ldr r13, [r0], #4\n\t" /* stack pointer (sp) */
"ldr r14, [r0], #4\n\t" /* link register (lr) */
"ldmia r0!, {r4, r5, r6, r7, r8, r9, r10, r11}\n\t"
// TODO: If using VFP, vldmia r0!, {d8-d15}
"mov r0, r1\n\t"
:
: "r" (env), "r" (val));
// *INDENT-ON*
// not reached
}
int
__attribute__ ((noinline))
setjmp (jmp_buf env)
{
// *INDENT-OFF*
asm (
"mov r0, %0\n\t"
"str r13, [r0], #4\n\t" /* stack pointer (sp) */
"str r14, [r0], #4\n\t" /* link register (lr) */
"stmia r0!, {r4, r5, r6, r7, r8, r9, r10, r11}\n\t"
// TODO: If using VFP, vstmia r0!, {d8-d15}
:
: "r" (env)
: "r0");
// *INDENT-ON*
return 0;
}