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786 |
skrzyp |
//=============================================================================
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//
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// hal_syscall.c
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//
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//
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//
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//=============================================================================
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// ####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later
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// version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// 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 eCos; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// As a special exception, if other files instantiate templates or use
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// macros or inline functions from this file, or you compile this file
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// and link it with other works to produce a work based on this file,
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// this file does not by itself cause the resulting work to be covered by
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// the GNU General Public License. However the source code for this file
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// must still be made available in accordance with section (3) of the GNU
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// General Public License v2.
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//
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// This exception does not invalidate any other reasons why a work based
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// on this file might be covered by the GNU General Public License.
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// -------------------------------------------
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// ####ECOSGPLCOPYRIGHTEND####
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//=============================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): msalter
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// Contributors:msalter, jskov, nickg
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// Date: 2002-02-28
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// Purpose:
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// Description:
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//
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//
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//
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//####DESCRIPTIONEND####
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//
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//=============================================================================
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#include <pkgconf/hal.h>
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#include <cyg/hal/hal_stub.h> // Our header
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#include <cyg/hal/hal_arch.h> // HAL_BREAKINST
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#include <cyg/hal/hal_cache.h> // HAL_xCACHE_x
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#include <cyg/hal/hal_intr.h> // interrupt disable/restore
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#include <cyg/hal/hal_if.h> // ROM calling interface
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#include <cyg/hal/hal_misc.h> // Helper functions
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#include <redboot.h>
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extern int __do_syscall(int func, // syscall function number
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long arg1, long arg2, // up to four args.
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long arg3, long arg4,
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int *retval, // syscall return value
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int *sig); // signal to return (or 0)
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#define _shnewlib_SYS_exit 1
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#define _shnewlib_SYS_fork 2
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#define _shnewlib_SYS_read 3
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#define _shnewlib_SYS_write 4
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#define _shnewlib_SYS_open 5
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#define _shnewlib_SYS_close 6
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#define _shnewlib_SYS_wait4 7
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#define _shnewlib_SYS_creat 8
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#define _shnewlib_SYS_link 9
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#define _shnewlib_SYS_unlink 10
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#define _shnewlib_SYS_execv 11
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#define _shnewlib_SYS_chdir 12
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#define _shnewlib_SYS_mknod 14
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#define _shnewlib_SYS_chmod 15
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#define _shnewlib_SYS_chown 16
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#define _shnewlib_SYS_lseek 19
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#define _shnewlib_SYS_getpid 20
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#define _shnewlib_SYS_isatty 21
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#define _shnewlib_SYS_fstat 22
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#define _shnewlib_SYS_time 23
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#define _shnewlib_SYS_ARG 24
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#define _shnewlib_SYS_stat 38
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#define _shnewlib_SYS_pipe 42
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#define _shnewlib_SYS_execve 59
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#define _shnewlib_SYS_argc 172 /* == 0xAC, for Argument Count :-) */
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#define _shnewlib_SYS_argnlen 173
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#define _shnewlib_SYS_argn 174
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#define _shnewlib_SYS_utime 201 /* not really a system call */
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#define _shnewlib_SYS_wait 202 /* nor is this */
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int
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hal_syscall_handler(void)
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{
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int func, arg1, arg2, arg3, arg4;
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int err, sig;
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func = get_register(R4);
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arg1 = get_register(R5);
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arg2 = get_register(R6);
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arg3 = get_register(R7);
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arg4 = *(unsigned int *)(get_register(SP));
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switch (func) {
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case _shnewlib_SYS_exit:
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func = SYS_exit;
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break;
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case _shnewlib_SYS_read:
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func = SYS_read;
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break;
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case _shnewlib_SYS_write:
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func = SYS_write;
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break;
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case _shnewlib_SYS_open:
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func = SYS_open;
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break;
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case _shnewlib_SYS_close:
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func = SYS_close;
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break;
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case _shnewlib_SYS_lseek:
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func = SYS_lseek;
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break;
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case _shnewlib_SYS_unlink:
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func = SYS_unlink;
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break;
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case _shnewlib_SYS_getpid:
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func = SYS_getpid;
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break;
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case _shnewlib_SYS_fstat:
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func = SYS_fstat;
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break;
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case _shnewlib_SYS_chdir:
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func = SYS_chdir;
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break;
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case _shnewlib_SYS_stat:
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func = SYS_stat;
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break;
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case _shnewlib_SYS_chmod:
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func = SYS_chmod;
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break;
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case _shnewlib_SYS_time:
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func = SYS_time;
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break;
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case _shnewlib_SYS_isatty:
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func = SYS_isatty;
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break;
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case _shnewlib_SYS_utime:
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func = SYS_utime;
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case _shnewlib_SYS_argc:
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put_register( R0, 0 );
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put_register( R1, 0 );
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return 0;
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default:
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return SIGTRAP;
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}
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if (func == SYS_interrupt) {
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// A console interrupt landed us here.
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// Invoke the debug agent so as to cause a SIGINT.
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return SIGINT;
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}
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if (__do_syscall(func, arg1, arg2, arg3, arg4, &err, &sig)) {
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// R0 is normally result register, but newlib's trap
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// code looks in R1 for the return value
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put_register(R1, err);
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return sig;
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}
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return SIGTRAP;
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}
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