nuttx/arch/mips/include/mips32/syscall.h

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/****************************************************************************
* arch/mips/include/mips32/syscall.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.
*
****************************************************************************/
/* This file should never be included directly but, rather, only indirectly
* through include/syscall.h or include/sys/sycall.h
*/
#ifndef __ARCH_MIPS_INCLUDE_MIPS32_SYSCALL_H
#define __ARCH_MIPS_INCLUDE_MIPS32_SYSCALL_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifndef __ASSEMBLY__
# include <stdint.h>
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define SYS_syscall 0x00
/* Configuration ************************************************************/
/* SYS call 1 and 2 are defined for internal use by the PIC32MX port (see
* arch/mips/include/mips32/syscall.h). In addition, SYS call 3 is the
* return from a SYS call in kernel mode. The first four syscall values
* must, therefore, be reserved (0 is not used).
*/
2014-04-14 00:22:22 +02:00
#ifdef CONFIG_BUILD_KERNEL
# ifndef CONFIG_SYS_RESERVED
# error "CONFIG_SYS_RESERVED must be defined to the value 4"
# elif CONFIG_SYS_RESERVED != 4
# error "CONFIG_SYS_RESERVED must have the value 4"
# endif
#endif
/* sys_call macros **********************************************************/
/* System calls with 3 parameters and fewer are handled by sys_call0
* (sys_call1, sys_call2, and sys_call3 are aliases for sys_call0).
* This is because the parameters are passed in a0-a3. a0 is reserved for
* the syscall number leaving up to three additional parameters that can be
* passed in registers. The remainder would have to be pushed onto the
* stack.
*
* Instead, these macros are provided which handle parameters four, five and
* six in a non-standard way: The use s0 ($7), s1 ($8), and s2 ($9) to pass
* the additional parameters.
*/
#ifndef __ASSEMBLY__
/* System call SYS_ argument and four additional parameters. */
#define sys_call4(nbr,parm1,parm2,parm3,parm4) __extension__({ \
uintptr_t __result; \
__asm__ __volatile__ (\
"\tmove $4, %0\n" \
"\tmove $5, %1\n" \
"\tmove $6, %2\n" \
"\tmove $7, %3\n" \
"\tmove $8, %4\n" \
"\la $12, sys_call3\n" \
"\jalr $12, $31\n" \
"\tmove %5, $r2\n" \
: "=r" (nbr) "=r" (parm1) "=r" (parm2) "=r" (parm3) "=r" (parm4) \
: " "r"(__result)\
: "memory"\
); \
__result; \
})
/* System call SYS_ argument and five additional parameters. */
#define sys_call5(nbr,parm1,parm2,parm3,parm4,parm5) __extension__({ \
uintptr_t __result; \
__asm__ __volatile__ (\
"\tmove $4, %0\n" \
"\tmove $5, %1\n" \
"\tmove $6, %2\n" \
"\tmove $7, %3\n" \
"\tmove $8, %4\n" \
"\tmove $9, %5\n" \
"\la $12, sys_call3\n" \
"\jalr $12, $31\n" \
"\tmove %6, $r2\n" \
: "=r" (nbr) "=r" (parm1) "=r" (parm2) "=r" (parm3) "=r" (parm4) "=r" (parm5) \
: " "r"(__result)\
: "memory"\
); \
__result; \
})
/* System call SYS_ argument and six additional parameters. */
#define sys_call5(nbr,parm1,parm2,parm3,parm4,parm5,parm6) __extension__({ \
uintptr_t __result; \
__asm__ __volatile__ (\
"\tmove $4, %0\n" \
"\tmove $5, %1\n" \
"\tmove $6, %2\n" \
"\tmove $7, %3\n" \
"\tmove $8, %4\n" \
"\tmove $9, %5\n" \
"\tmove $10, %5\n" \
"\la $12, sys_call3\n" \
"\jalr $12, $31\n" \
"\tmove %6, $r2\n" \
: "=r" (nbr) "=r" (parm1) "=r" (parm2) "=r" (parm3) "=r" (parm4) "=r" (parm5) \
: " "r"(__result)\
: "memory"\
); \
__result; \
})
/* Context switching system calls *******************************************/
/* SYS call 0: (not used) */
/* SYS call 1:
*
* void up_fullcontextrestore(uint32_t *restoreregs) noreturn_function;
*/
#define SYS_restore_context (1)
#define up_fullcontextrestore(restoreregs) \
sys_call1(SYS_restore_context, (uintptr_t)restoreregs)
/* SYS call 2:
*
* void up_switchcontext(uint32_t *saveregs, uint32_t *restoreregs);
*/
#define SYS_switch_context (2)
#define up_switchcontext(saveregs, restoreregs) \
sys_call2(SYS_switch_context, (uintptr_t)saveregs, (uintptr_t)restoreregs)
#ifdef CONFIG_BUILD_KERNEL
/* SYS call 3:
*
* void up_syscall_return(void);
*/
#define SYS_syscall_return (3)
#define up_syscall_return() (void)sys_call0(SYS_syscall_return)
#endif
#endif /* __ASSEMBLY__ */
/****************************************************************************
* Public Types
****************************************************************************/
/****************************************************************************
* Inline functions
****************************************************************************/
#ifndef __ASSEMBLY__
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/****************************************************************************
* Name: up_syscall0
*
* Description:
* System call SYS_ argument and no additional parameters.
*
****************************************************************************/
uintptr_t sys_call0(unsigned int nbr);
/****************************************************************************
* Name: up_syscall1
*
* Description:
* System call SYS_ argument and one additional parameter.
*
****************************************************************************/
uintptr_t sys_call1(unsigned int nbr, uintptr_t parm1);
/****************************************************************************
* Name: up_syscall2
*
* Description:
* System call SYS_ argument and two additional parameters.
*
****************************************************************************/
uintptr_t sys_call2(unsigned int nbr, uintptr_t parm1, uintptr_t parm2);
/****************************************************************************
* Name: up_syscall3
*
* Description:
* System call SYS_ argument and three additional parameters.
*
****************************************************************************/
uintptr_t sys_call3(unsigned int nbr, uintptr_t parm1, uintptr_t parm2,
uintptr_t parm3);
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_MIPS_INCLUDE_MIPS32_SYSCALL_H */