diff packages/hal/arm/arch/current/src/hal_syscall.c @ 136:a9ac27ec7abc ecos-sw-2000-11-17

Merge from eCos master repository on 2000-11-17-18:24:25-GMT
author jlarmour
date Fri, 17 Nov 2000 23:16:43 +0000
parents
children e0c0827131d1
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new file mode 100644
--- /dev/null
+++ b/packages/hal/arm/arch/current/src/hal_syscall.c
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+//=============================================================================
+//
+//      hal_syscall.c
+//
+//      
+//
+//=============================================================================
+//####COPYRIGHTBEGIN####
+//                                                                          
+// -------------------------------------------                              
+// The contents of this file are subject to the Red Hat eCos Public License 
+// Version 1.1 (the "License"); you may not use this file except in         
+// compliance with the License.  You may obtain a copy of the License at    
+// http://www.redhat.com/                                                   
+//                                                                          
+// Software distributed under the License is distributed on an "AS IS"      
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
+// License for the specific language governing rights and limitations under 
+// the License.                                                             
+//                                                                          
+// The Original Code is eCos - Embedded Configurable Operating System,      
+// released September 30, 1998.                                             
+//                                                                          
+// The Initial Developer of the Original Code is Red Hat.                   
+// Portions created by Red Hat are                                          
+// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
+// All Rights Reserved.                                                     
+// -------------------------------------------                              
+//                                                                          
+//####COPYRIGHTEND####
+//=============================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):   msalter
+// Contributors:msalter
+// Date:        2000-11-5
+// Purpose:     
+// Description: 
+//              
+//              
+//
+//####DESCRIPTIONEND####
+//
+//=============================================================================
+
+#include <pkgconf/hal.h>
+
+#ifdef CYGPKG_REDBOOT
+#include <pkgconf/redboot.h>
+#endif
+
+#if defined(CYGSEM_REDBOOT_BSP_SYSCALLS)
+
+#include <cyg/hal/hal_stub.h>           // Our header
+#include <cyg/hal/hal_arch.h>           // HAL_BREAKINST
+#include <cyg/hal/hal_cache.h>          // HAL_xCACHE_x
+#include <cyg/hal/hal_intr.h>           // interrupt disable/restore
+
+#include <cyg/hal/hal_if.h>             // ROM calling interface
+#include <cyg/hal/hal_misc.h>           // Helper functions
+
+extern int __do_syscall(int func,		// syscall function number
+			long arg1, long arg2,	// up to four args.
+			long arg3, long arg4,
+			int *retval);		// syscall return value
+
+#define	SYS_exit	1
+#define SYS_interrupt   1000
+
+int
+hal_syscall_handler(void)
+{
+    int func, arg1, arg2, arg3, arg4;
+    int err;
+
+#if 0
+    union arm_insn inst;
+
+    // What is the instruction we were executing
+    //
+    inst.word = *(unsigned long *)(regs->_pc - ARM_INST_SIZE);
+
+    // Not a syscall.  Don't handle it
+    if ((inst.swi.rsv1 != SWI_RSV1_VALUE) || (inst.swi.swi_number != SYSCALL_SWI))
+        return 0;
+#endif
+
+    func = get_register(R0);
+    arg1 = get_register(R1);
+    arg2 = get_register(R2);
+    arg3 = get_register(R3);
+    arg4 = *(unsigned int *)(get_register(SP) + 4);
+
+    if ((get_register(PS) & CPSR_MODE_BITS) == CPSR_SUPERVISOR_MODE)
+	put_register(PC, get_register(IP));
+    else
+	put_register(PC, get_register(LR));
+
+    if (func == SYS_exit) {
+	// We want to stop in exit so that the user may poke around
+	//  to see why his app exited.
+        return SIGTRAP;
+    }
+
+    if (func == SYS_interrupt) {
+	//  A console interrupt landed us here.
+	//  Invoke the debug agent so as to cause a SIGINT.
+        return SIGINT;
+    }
+
+    if (__do_syscall(func, arg1, arg2, arg3, arg4, &err)) {
+        put_register(R0, err);
+	return 0;
+    }
+
+    return SIGTRAP;
+}
+
+#endif // CYGSEM_REDBOOT_BSP_SYSCALLS