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xtensa: Implement simcall

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YAMAMOTO Takashi 2020-03-12 16:07:38 +09:00 committed by Xiang Xiao
parent 7774cdd7aa
commit c18d7dc434
2 changed files with 149 additions and 0 deletions
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89
arch/xtensa/include/simcall.h Normal file
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/****************************************************************************
* arch/xtensa/include/simcall.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
#ifndef __ARCH_XTENSA_INCLUDE_SIMCALL_H
#define __ARCH_XTENSA_INCLUDE_SIMCALL_H
/****************************************************************************
* Included Files
****************************************************************************/
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define SIMCALL_SYS_READ 3
#define SIMCALL_SYS_WRITE 4
#define SIMCALL_SYS_OPEN 5
#define SIMCALL_SYS_CLOSE 6
#define SIMCALL_SYS_LSEEK 19
/* fcntl O_xxx constants for simcall.
*
* Someone with the official spec should fix this and qemu.
* I made this CONFIG_HOST_xxx dependant because:
* - the qemu implementation just pass them to the host OS
* - I don't have an official documentation.
* - I build NuttX and run qemu on the same host.
* I know this is wrong. But it works for me.
*/
#if CONFIG_HOST_MACOS
#define SIMCALL_O_RDONLY 0x0000
#define SIMCALL_O_WRONLY 0x0001
#define SIMCALL_O_RDWR 0x0003
#define SIMCALL_O_ACCMODE 0x0003
#define SIMCALL_O_APPEND 0x0008
#define SIMCALL_O_CREAT 0x0200
#define SIMCALL_O_TRUNC 0x0400
#define SIMCALL_O_EXCL 0x0800
#else
/* Assume Linux */
#define SIMCALL_O_RDONLY 0x0000
#define SIMCALL_O_WRONLY 0x0001
#define SIMCALL_O_RDWR 0x0002
#define SIMCALL_O_ACCMODE 0x0003
#define SIMCALL_O_APPEND 0x0400
#define SIMCALL_O_CREAT 0x0040
#define SIMCALL_O_TRUNC 0x0200
#define SIMCALL_O_EXCL 0x0080
#endif
/****************************************************************************
* Public Types
****************************************************************************/
/****************************************************************************
* Inline functions
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
int simcall(int nr, int param1, int param2, int param3, int *errp);
#endif /* __ARCH_XTENSA_INCLUDE_SIMCALL_H */

60
arch/xtensa/src/common/xtensa_simcall.S Normal file
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/****************************************************************************
* arch/xtensa/src/common/xtensa_simcall.S
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include "xtensa_abi.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: simcall
*
* Description:
* Execute a SIMCALL instruction
*
* Entry Conditions:
* A2 - SIMCALL number
* A3..A5 - SIMCALL arguments
* A6 - the pointer to store errno
*
****************************************************************************/
.global simcall
.type simcall, @function
simcall:
ENTRY0
simcall
/* A2 - return value
* A3 - errno
*/
s32i a3, a6, 0 /* store errno */
RET0