124 lines
3.5 KiB
ArmAsm
124 lines
3.5 KiB
ArmAsm
/*
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* Lattice Mico32 system calls.
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* Contributed by Jon Beniston <jon@beniston.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <syscall.h>
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/*
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* System call convention (as implemented in simulator:
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* - System call number in register r8
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* - Return value in r1 and r2 (only if 64-bit value)
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* - errno in r3
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*/
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.extern errno
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.global _write
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_write:
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mvi r8, SYS_write
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scall
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mvhi r4, hi(errno)
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ori r4, r4, lo(errno)
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sw (r4+0), r3
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ret
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.global _read
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_read:
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mvi r8, SYS_read
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scall
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mvhi r4, hi(errno)
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ori r4, r4, lo(errno)
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sw (r4+0), r3
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ret
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.global _open
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_open:
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mvi r8, SYS_open
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scall
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mvhi r4, hi(errno)
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ori r4, r4, lo(errno)
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sw (r4+0), r3
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ret
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.global _close
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_close:
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mvi r8, SYS_close
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scall
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mvhi r4, hi(errno)
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ori r4, r4, lo(errno)
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sw (r4+0), r3
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ret
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.global _lseek
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_lseek:
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mvi r8, SYS_lseek
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scall
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mvhi r4, hi(errno)
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ori r4, r4, lo(errno)
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sw (r4+0), r3
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ret
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.global _fstat
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_fstat:
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mvi r8, SYS_fstat
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scall
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mvhi r4, hi(errno)
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ori r4, r4, lo(errno)
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sw (r4+0), r3
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ret
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.global _stat
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_stat:
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mvi r8, SYS_stat
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scall
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mvhi r4, hi(errno)
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ori r4, r4, lo(errno)
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sw (r4+0), r3
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ret
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.global _link
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_link:
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mvi r8, SYS_link
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scall
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mvhi r4, hi(errno)
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ori r4, r4, lo(errno)
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sw (r4+0), r3
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ret
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.global _unlink
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_unlink:
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mvi r8, SYS_unlink
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scall
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mvhi r4, hi(errno)
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ori r4, r4, lo(errno)
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sw (r4+0), r3
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ret
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.global _exit
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_exit:
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/* This call doesn't return */
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mvi r8, SYS_exit
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scall
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