74 lines
2.0 KiB
ArmAsm
74 lines
2.0 KiB
ArmAsm
/* Copyright (c) 2012, 2013 Red Hat, Inc. All rights reserved.
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This copyrighted material is made available to anyone wishing to use, modify,
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copy, or redistribute it subject to the terms and conditions of the BSD
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License. This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY expressed or implied, including the implied warranties
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. A copy of this license
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is available at http://www.opensource.org/licenses. Any Red Hat trademarks that
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are incorporated in the source code or documentation are not subject to the BSD
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License and may only be used or replicated with the express permission of
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Red Hat, Inc.
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*/
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/* Be wary: the lower N bits of the *address* of the function
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determines the syscall used by the simulator. Thus, the addresses
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listed here depend on the syscall numbers in ../syscalls.h. */
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/* As per the MSP430x200 Family Users Guide, section 1.5, "An
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instruction fetch from the address range 0x0000 - 0x01FF will reset
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the device." We take advantage of that to do syscalls in the
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simulator, by trying to execute specific addresses in that range
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and letting the simulator catch them while simulating the CALL
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instruction. In theory, this is an operation that the physical
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hardware will never attempt to do, so it won't interfere with the
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simulation's accuracy (i.e. we aren't abusing holes in the opcode
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map, for example). */
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#include "../syscall.h"
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#include "memmodel.h"
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.macro sc,a
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sc2 \a,\a
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.endm
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.macro sc2,name,num
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.weak \name
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.global \name
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\name = 0x180 + \num
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.endm
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#define SC(n) sc2 n,SYS_##n
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sc2 _exit,SYS_exit
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SC (exit)
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SC (open)
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SC (close)
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SC (read)
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/* SC (write)*/
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SC (fstat)
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SC (lseek)
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SC (kill)
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.weak isatty
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.global isatty
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isatty:
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.weak _isatty
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.global _isatty
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_isatty:
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MOV #1,R12
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ret_
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.weak getpid
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.global getpid
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getpid:
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MOV #42,R12
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ret_
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.weak gettimeofday
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.global gettimeofday
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gettimeofday:
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MOV #0,R12
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ret_
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.size gettimeofday , . - gettimeofday
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