68 lines
1.7 KiB
C
68 lines
1.7 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 © 2016,2017,2018,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.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 <errno.h>
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#include <linux/x86_64/syscall.h>
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// *INDENT-OFF*
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static long
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__sys_call_internal (long sys_call)
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{
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long r;
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asm (
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"mov %1,%%rax\n\t"
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"syscall \n\t"
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"mov %%rax,%0\n\t"
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: "=r" (r)
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: "rm" (sys_call)
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: "rax"
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);
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return r;
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}
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static long
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__sys_call2_internal (long sys_call, long one, long two)
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{
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long r;
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asm (
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"mov %1,%%rax\n\t"
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"mov %2,%%rdi\n\t"
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"mov %3,%%rsi\n\t"
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"syscall \n\t"
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"mov %%rax,%0\n\t"
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: "=r" (r)
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: "rm" (sys_call), "rm" (one), "rm" (two)
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: "rax", "rdi", "rsi"
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);
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return r;
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}
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// *INDENT-ON*
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/* Return < 0 on error (errno-like value from kernel), or 0 on success */
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int
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__raise (int signum)
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{
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long pid = __sys_call_internal (SYS_getpid);
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if (pid < 0)
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return pid;
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else
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return __sys_call2_internal (SYS_kill, pid, signum);
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}
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