mes/lib/mini-linux-gcc.c

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/* -*-comment-start: "//";comment-end:""-*-
* Mes --- Maxwell Equations of Software
* Copyright © 2016,2017 Jan Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of Mes.
*
* 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.
*
* 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 Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#if !POSIX
void
exit (int code)
{
#if !__TINYC__
asm (
"mov %0,%%ebx\n\t"
"mov $1,%%eax\n\t"
"int $0x80\n\t"
: // no outputs "=" (r)
: "" (code)
);
#else // __TINYC__
asm (
"mov %0,%%ebx\n\t"
"mov $1,%%eax\n\t"
"int $128\n\t"
: // no outputs "=" (r)
: "Ir" (code)
);
#endif // __TINYC__
// not reached
exit (0);
}
int
write (int fd, char const* s, int n)
{
int r;
#if __GNUC__
asm (
"mov %1,%%ebx\n\t"
"mov %2,%%ecx\n\t"
"mov %3,%%edx\n\t"
"mov $0x04,%%eax\n\t"
"int $0x80\n\t"
"mov %%eax,%0\n\t"
: "=r" (r)
: "" (fd), "" (s), "" (n)
: "eax", "ebx", "ecx", "edx"
);
//syscall (SYS_write, fd, s, n));
#elif __TINYC__
asm (
"mov %1,%%ebx\n\t"
"mov %2,%%ecx\n\t"
"mov %3,%%edx\n\t"
"mov $4, %%eax\n\t"
"int $128\n\t"
"mov %%eax,%0\n\t"
: "=r" (r)
: "Ir" (fd), "Ir" (s), "Ir" (n)
: "eax", "ebx", "ecx"//, "edx"
);
#endif
return r;
}
#endif //!POSIX