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phoenix |
//=============================================================================
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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 Red Hat, 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 version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// 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 along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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//
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-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
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// Date: 2000-11-5
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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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#ifdef CYGPKG_REDBOOT
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#include <pkgconf/redboot.h>
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#endif
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#if defined(CYGSEM_REDBOOT_BSP_SYSCALLS)
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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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extern CYG_ADDRWORD __do_syscall(CYG_ADDRWORD func, // syscall function number
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CYG_ADDRWORD arg1, CYG_ADDRWORD arg2, // up to four args.
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CYG_ADDRWORD arg3, CYG_ADDRWORD arg4,
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CYG_ADDRWORD *retval, // syscall return value
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CYG_ADDRWORD *sig); // signal to return (or 0)
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#define SYS_exit 1
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#define SYS_interrupt 1000
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int
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hal_syscall_handler(void)
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{
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CYG_ADDRWORD func, arg1, arg2, arg3, arg4;
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CYG_ADDRWORD err, sig;
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int retreg;
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target_register_t sr = get_register(REG_SR);
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if ((sr & CYGARC_SR_PM) == 0 || (sr & CYGARC_SR_BS) == 0) {
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// bank zero regs
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func = get_register(REG_B0R0);
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arg1 = get_register(REG_B0R1);
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arg2 = get_register(REG_B0R2);
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arg3 = get_register(REG_B0R3);
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arg4 = 0;
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retreg = REG_B0R0;
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} else {
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func = get_register(REG_B1R0);
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arg1 = get_register(REG_B1R1);
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arg2 = get_register(REG_B1R2);
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arg3 = get_register(REG_B1R3);
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retreg = REG_B1R0;
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}
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set_pc(get_pc()+2);
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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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put_register(retreg, err);
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return (int)sig;
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}
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return SIGTRAP;
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}
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#endif // CYGSEM_REDBOOT_BSP_SYSCALLS
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