89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* Mes --- Maxwell Equations of Software
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* Copyright © 2016,2017 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of Mes.
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*
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* 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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* 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 Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define SYS_exit "0x01"
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#define SYS_write "0x04"
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void
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_exit (int code)
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{
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#if !__TINYC__
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asm (
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"mov $"SYS_exit",%%eax\n\t"
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"mov %0,%%ebx\n\t"
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"int $0x80\n\t"
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: // no outputs "=" (r)
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: "" (code)
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);
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#else // __TINYC__
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asm (
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"mov $"SYS_exit",%%eax\n\t"
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"mov %0,%%ebx\n\t"
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"int $128\n\t"
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: // no outputs "=" (r)
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: "Ir" (code)
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);
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#endif // __TINYC__
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// not reached
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_exit (0);
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}
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void (*__call_at_exit) (void);
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void
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exit (int code)
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{
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if (__call_at_exit)
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(*__call_at_exit) ();
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_exit (code);
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}
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ssize_t
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write (int filedes, void const *buffer, size_t size)
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{
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int r;
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#if __GNUC__
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asm (
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"mov $"SYS_write",%%eax\n\t"
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"mov %1,%%ebx\n\t"
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"mov %2,%%ecx\n\t"
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"mov %3,%%edx\n\t"
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"int $0x80\n\t"
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"mov %%eax,%0\n\t"
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: "=r" (r)
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: "" (filedes), "" (buffer), "" (size)
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: "eax", "ebx", "ecx", "edx"
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);
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#elif __TINYC__
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asm (
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"mov $"SYS_write",%%eax\n\t"
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"mov %1,%%ebx\n\t"
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"mov %2,%%ecx\n\t"
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"mov %3,%%edx\n\t"
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"int $128\n\t"
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"mov %%eax,%0\n\t"
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: "=r" (r)
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: "Ir" (filedes), "Ir" (buffer), "Ir" (size)
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: "eax", "ebx", "ecx"//, "edx"
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);
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#endif
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return r;
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}
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