63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
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/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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* Copyright © 2019,2020 Danny Milosavljevic <dannym@scratchpost.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <setjmp.h>
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#include <stdlib.h>
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void
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__attribute__ ((noinline))
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longjmp (jmp_buf env, int val)
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{
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// *INDENT-OFF*
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asm (
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"mov r0, %0\n\t"
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"mov r1, %1\n\t"
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"cmp r1, #0\n\t"
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"moveq r1, #1\n\t" /* returning 0 is not allowed, even when the user wanted to. */
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"ldr r13, [r0], #4\n\t" /* stack pointer (sp) */
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"ldr r14, [r0], #4\n\t" /* link register (lr) */
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"ldmia r0!, {r4, r5, r6, r7, r8, r9, r10, r11}\n\t"
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// TODO: If using VFP, vldmia r0!, {d8-d15}
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"mov r0, r1\n\t"
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:
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: "r" (env), "r" (val));
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// *INDENT-ON*
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// not reached
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}
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int
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__attribute__ ((noinline))
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setjmp (jmp_buf env)
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{
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// *INDENT-OFF*
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asm (
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"mov r0, %0\n\t"
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"str r13, [r0], #4\n\t" /* stack pointer (sp) */
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"str r14, [r0], #4\n\t" /* link register (lr) */
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"stmia r0!, {r4, r5, r6, r7, r8, r9, r10, r11}\n\t"
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// TODO: If using VFP, vstmia r0!, {d8-d15}
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:
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: "r" (env)
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: "r0");
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// *INDENT-ON*
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return 0;
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}
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