259 lines
8.3 KiB
C
259 lines
8.3 KiB
C
/****************************************************************************
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* arch/mips/include/mips32/syscall.h
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*
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* Copyright (C) 2011-2013, 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/* This file should never be included directly but, rather, only indirectly
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* through include/syscall.h or include/sys/sycall.h
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*/
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#ifndef __ARCH_MIPS_INCLUDE_MIPS32_SYSCALL_H
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#define __ARCH_MIPS_INCLUDE_MIPS32_SYSCALL_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifndef __ASSEMBLY__
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# include <stdint.h>
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#endif
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define SYS_syscall 0x00
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/* Configuration ************************************************************/
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/* SYS call 1 and 2 are defined for internal use by the PIC32MX port (see
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* arch/mips/include/mips32/syscall.h). In addition, SYS call 3 is the
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* return from a SYS call in kernel mode. The first four syscall values must,
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* therefore, be reserved (0 is not used).
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*/
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#ifdef CONFIG_BUILD_KERNEL
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# ifndef CONFIG_SYS_RESERVED
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# error "CONFIG_SYS_RESERVED must be defined to the value 4"
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# elif CONFIG_SYS_RESERVED != 4
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# error "CONFIG_SYS_RESERVED must have the value 4"
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# endif
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#endif
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/* sys_call macros **********************************************************/
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/* System calls with 3 parameters and fewer are handled by sys_call0
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* (sys_call1, sys_call2, and sys_call3 are aliases for sys_call0).
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* This is because the parameters are passed in a0-a3. a0 is reserved for
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* the syscall number leaving up to three additional parameters that can be
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* passed in registers. The remainder would have to be pushed onto the stack.
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*
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* Instead, these macros are provided which handle parameters four, five and
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* six in a non-standard way: The use s0 ($7), s1 ($8), and s2 ($9) to pass
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* the additional parameters.
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*/
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#ifndef __ASSEMBLY__
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/* System call SYS_ argument and four additional parameters. */
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#define sys_call4(nbr,parm1,parm2,parm3,parm4) __extension__({ \
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uintptr_t __result; \
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__asm__ __volatile__ (\
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"\tmove $4, %0\n" \
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"\tmove $5, %1\n" \
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"\tmove $6, %2\n" \
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"\tmove $7, %3\n" \
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"\tmove $8, %4\n" \
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"\la $12, sys_call3\n" \
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"\jalr $12, $31\n" \
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"\tmove %5, $r2\n" \
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: "=r" (nbr) "=r" (parm1) "=r" (parm2) "=r" (parm3) "=r" (parm4) \
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: " "r"(__result)\
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: "memory"\
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); \
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__result; \
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})
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/* System call SYS_ argument and five additional parameters. */
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#define sys_call5(nbr,parm1,parm2,parm3,parm4,parm5) __extension__({ \
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uintptr_t __result; \
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__asm__ __volatile__ (\
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"\tmove $4, %0\n" \
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"\tmove $5, %1\n" \
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"\tmove $6, %2\n" \
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"\tmove $7, %3\n" \
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"\tmove $8, %4\n" \
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"\tmove $9, %5\n" \
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"\la $12, sys_call3\n" \
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"\jalr $12, $31\n" \
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"\tmove %6, $r2\n" \
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: "=r" (nbr) "=r" (parm1) "=r" (parm2) "=r" (parm3) "=r" (parm4) "=r" (parm5) \
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: " "r"(__result)\
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: "memory"\
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); \
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__result; \
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})
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/* System call SYS_ argument and six additional parameters. */
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#define sys_call5(nbr,parm1,parm2,parm3,parm4,parm5,parm6) __extension__({ \
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uintptr_t __result; \
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__asm__ __volatile__ (\
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"\tmove $4, %0\n" \
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"\tmove $5, %1\n" \
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"\tmove $6, %2\n" \
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"\tmove $7, %3\n" \
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"\tmove $8, %4\n" \
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"\tmove $9, %5\n" \
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"\tmove $10, %5\n" \
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"\la $12, sys_call3\n" \
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"\jalr $12, $31\n" \
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"\tmove %6, $r2\n" \
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: "=r" (nbr) "=r" (parm1) "=r" (parm2) "=r" (parm3) "=r" (parm4) "=r" (parm5) \
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: " "r"(__result)\
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: "memory"\
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); \
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__result; \
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})
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/* Context switching system calls *******************************************/
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/* SYS call 0: (not used) */
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/* SYS call 1:
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*
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* void up_fullcontextrestore(uint32_t *restoreregs) noreturn_function;
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*/
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#define SYS_restore_context (1)
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#define up_fullcontextrestore(restoreregs) \
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sys_call1(SYS_restore_context, (uintptr_t)restoreregs)
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/* SYS call 2:
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*
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* void up_switchcontext(uint32_t *saveregs, uint32_t *restoreregs);
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*/
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#define SYS_switch_context (2)
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#define up_switchcontext(saveregs, restoreregs) \
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sys_call2(SYS_switch_context, (uintptr_t)saveregs, (uintptr_t)restoreregs)
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#ifdef CONFIG_BUILD_KERNEL
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/* SYS call 3:
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*
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* void up_syscall_return(void);
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*/
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#define SYS_syscall_return (3)
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#define up_syscall_return() (void)sys_call0(SYS_syscall_return)
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#endif
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#endif /* __ASSEMBLY__ */
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Inline functions
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****************************************************************************/
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#ifndef __ASSEMBLY__
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Name: up_syscall0
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*
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* Description:
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* System call SYS_ argument and no additional parameters.
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*
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****************************************************************************/
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uintptr_t sys_call0(unsigned int nbr);
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/****************************************************************************
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* Name: up_syscall1
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*
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* Description:
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* System call SYS_ argument and one additional parameter.
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*
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****************************************************************************/
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uintptr_t sys_call1(unsigned int nbr, uintptr_t parm1);
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/****************************************************************************
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* Name: up_syscall2
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*
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* Description:
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* System call SYS_ argument and two additional parameters.
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*
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****************************************************************************/
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uintptr_t sys_call2(unsigned int nbr, uintptr_t parm1, uintptr_t parm2);
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/****************************************************************************
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* Name: up_syscall3
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*
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* Description:
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* System call SYS_ argument and three additional parameters.
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*
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****************************************************************************/
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uintptr_t sys_call3(unsigned int nbr, uintptr_t parm1, uintptr_t parm2,
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uintptr_t parm3);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __ARCH_MIPS_INCLUDE_MIPS32_SYSCALL_H */
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