readme_privatecode

vxworks下的一些DEMO程序风常丰富的内容

FILE LIST -
             privateCode.c

DESCRIPTION -
             initData - allocate memory and make it non-writable
	     This routine initializes the data and should be called only once.

	     dataModify - modify data
	     To modify the data, tasks must call this routine, 
             passing a pointer to the new data. 
             This routine makes the memory writable, modifies
	     the data, and sets the memory back to nonwritable. 
		 
	     If a task tries to read the memory, it is successful; however,
	     if it tries to modify the data outside of dataModify(), a bus
	     error occurs.

	     To test from the shell use:
	     -> initData
	     -> sp dataModify
	     -> d pData
	     -> bfill (pData, 1024, 'X')

RUNNING DEMO -
	     Place the privateCode.c in your <Tornado> dir. Depending
	     on the target you have, define the CPU in your compile
	     line and use the Makefile in the BSP dir. to compile.

TESTED ON -   Host/Target : Solaris 2.5.1 / mv177
	      VxWorks     : 5.3.1

EXAMPLE COMPILE LINE -
	      make privateCode.o

%make privateCode.o
cc68k -B/petaluma1/mayur/tor101-ppc/host/sun4-solaris2/lib/gcc-lib/ 
-m68040 -ansi -nostdinc -O2 -fvolatile -fno-builtin -Wall -I/h   -I. 
-I/petaluma1/mayur/tor101-ppc/target/config/all 
-I/petaluma1/mayur/tor101-ppc/target/h 
-I/petaluma1/mayur/tor101-ppc/target/src/config 
-I/petaluma1/mayur/tor101-ppc/target/src/drv -DCPU=MC68060     -c privateCode.c

OUTPUTS/LOGFILE -

On VxWorks target:
==================

-> ld <privateCode.o
value = 675736 = 0xa4f98

-> sp dataModify
task spawned: id = f9fe5c, name = u1
value = 16383580 = 0xf9fe5c
-> d pData
00fa0000:  0000 0000 0000 0000 0003 ae54 0003 ae54   *...........T...T*
00fa0010:  0003 ae54 0003 ae54 0003 ae54 0003 ae54   *...T...T...T...T*
00fa0020:  0003 ae54 0004 1280 0003 ae54 0005 11b8   *...T.......T....*
00fa0030:  0003 ae54 0003 ae54 0003 ae54 0003 aea2   *...T...T...T....*
00fa0040:  0003 aea2 0003 aea2 0003 aea2 0003 aea2   *................*
00fa0050:  0003 aea2 0003 aea2 0003 aea2 0003 aea2   *................*
00fa0060:  0003 aea2 0003 aea2 0003 aea2 0003 aea2   *................*
00fa0070:  0003 aea2 0003 aea2 0003 aea2 0003 aea2   *................*
00fa0080:  0003 ae54 0003 ae54 0004 1244 0003 ae54   *...T...T...D...T*
00fa0090:  0003 ae54 0003 ae54 0003 ae54 0003 ae54   *...T...T...T...T*
00fa00a0:  0003 ae54 0003 ae54 0003 ae54 0003 ae54   *...T...T...T...T*
00fa00b0:  0003 ae54 0003 ae54 0003 ae54 0003 ae54   *...T...T...T...T*
00fa00c0:  0003 ae54 0003 ae54 0003 ae54 0005 11a0   *...T...T...T....*
00fa00d0:  0003 ae54 0005 1198 0003 ae54 0005 11c0   *...T.......T....*
00fa00e0:  0003 ae54 0003 ae54 0003 ae54 0003 ae54   *...T...T...T...T*
00fa00f0:  0005 11c8 0004 fb50 0003 ae54 0003 ae54   *.......P...T...T*
value = 0 = 0x0
-> bfill (pData, 1024, 'X')

Exception number 2: Task: 0xf92cb8 (t9) 

Access Fault/Bus Error
Status Register     : 0x3000
Program Counter     : 0x3ea0
Effective Address   : 0xf98000
2b2b6    _vxTaskEntry   +10 : _wdbFuncCallLibInit (fffcec, 400, 58, 0, 0, 0, 0, 0, 0, 0)
226a8    _wdbFuncCallLibInit+dc : _bfill ([f98000, 400, 58, 0, 0, 0])
value = 0 = 0x0

The Output on Console:
======================
Access Fault
Program Counter: 0x00003ea0
Status Register: 0x3000
Access Address : 0x00f98000
Fault Status   : 0x00850080
Task: 0xf92cb8 "t9"