184 lines
3.9 KiB
C
184 lines
3.9 KiB
C
/* Copyright (C) 2005 David Decotigny
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Copyright (C) 2003 Thomas Petazzoni
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but 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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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USA.
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*/
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/**
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* @file crt.c
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*
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* The C RunTime environment for the basic support of SOS C user
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* programs
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*/
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#include <hwcore/swintr.h>
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#include <string.h>
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#include "crt.h"
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/**
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* Starter function !
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*/
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void _start() __attribute__((noreturn));
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void _start()
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{
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/* This starter function expects a main() function somewhere */
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extern int main();
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/* Reset the bss section */
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extern char _bbss, _ebss;
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memset(& _bbss, 0x0, (& _ebss) - (& _bbss));
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_sos_exit(main());
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}
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/*
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* By convention, the USER SOS programs always pass 4 arguments to the
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* kernel syscall handler: in eax/../edx. For less arguments, the
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* unused registers are filled with 0s. For more arguments, the 4th
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* syscall parameter gives the address of the array containing the
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* remaining arguments. In any case, eax corresponds to the syscall
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* IDentifier.
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*/
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inline
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int _sos_syscall3(int id,
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unsigned int arg1,
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unsigned int arg2,
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unsigned int arg3)
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{
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int ret;
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asm volatile("movl %1,%%eax \n"
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"movl %2,%%ebx \n"
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"movl %3,%%ecx \n"
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"movl %4,%%edx \n"
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"int %5\n"
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"movl %%eax, %0"
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:"=g"(ret)
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:"g"(id),"g"(arg1),"g"(arg2),"g"(arg3)
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,"i"(SOS_SWINTR_SOS_SYSCALL)
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:"eax","ebx","ecx","edx");
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return ret;
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}
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int _sos_syscall0(int id)
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{
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return _sos_syscall3(id, 0, 0, 0);
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}
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int _sos_syscall1(int id,
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unsigned int arg1)
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{
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return _sos_syscall3(id, arg1, 0, 0);
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}
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int _sos_syscall2(int id,
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unsigned int arg1,
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unsigned int arg2)
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{
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return _sos_syscall3(id, arg1, arg2, 0);
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}
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int _sos_syscall4(int id,
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unsigned int arg1,
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unsigned int arg2,
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unsigned int arg3,
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unsigned int arg4)
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{
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unsigned int args[] = { arg3, arg4 };
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return _sos_syscall3(id, arg1, arg2, (unsigned)args);
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}
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int _sos_syscall5(int id,
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unsigned int arg1,
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unsigned int arg2,
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unsigned int arg3,
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unsigned int arg4,
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unsigned int arg5)
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{
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unsigned int args[] = { arg3, arg4, arg5 };
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return _sos_syscall3(id, arg1, arg2, (unsigned)args);
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}
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int _sos_syscall6(int id,
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unsigned int arg1,
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unsigned int arg2,
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unsigned int arg3,
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unsigned int arg4,
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unsigned int arg5,
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unsigned int arg6)
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{
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unsigned int args[] = { arg3, arg4, arg5, arg6 };
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return _sos_syscall3(id, arg1, arg2, (unsigned)args);
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}
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int _sos_syscall7(int id,
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unsigned int arg1,
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unsigned int arg2,
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unsigned int arg3,
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unsigned int arg4,
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unsigned int arg5,
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unsigned int arg6,
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unsigned int arg7)
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{
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unsigned int args[] = { arg3, arg4, arg5, arg6, arg7 };
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return _sos_syscall3(id, arg1, arg2, (unsigned)args);
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}
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int _sos_syscall8(int id,
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unsigned int arg1,
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unsigned int arg2,
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unsigned int arg3,
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unsigned int arg4,
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unsigned int arg5,
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unsigned int arg6,
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unsigned int arg7,
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unsigned int arg8)
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{
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unsigned int args[] = { arg3, arg4, arg5, arg6, arg7, arg8 };
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return _sos_syscall3(id, arg1, arg2, (unsigned)args);
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}
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void _sos_exit(int status)
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{
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_sos_syscall1(SOS_SYSCALL_ID_EXIT, (unsigned)status);
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/* Never reached ! */
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for ( ; ; )
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;
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}
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int _sos_bochs_write(const char * str, unsigned length)
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{
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return _sos_syscall2(SOS_SYSCALL_ID_BOCHS_WRITE,
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(unsigned)str,
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length);
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}
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