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

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/****************************************************************************
* arch/mips/include/mips32/syscall.h
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/* This file should never be included directed 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
/****************************************************************************
* Pro-processor Definitions
****************************************************************************/
#define SYS_syscall 0x00
/* Configuration ********************************************************************/
/* This logic uses three system calls {0,1,2} for context switching. The first three
* syscall values must be reserved.
*/
#ifdef CONFIG_NUTTX_KERNEL
# ifndef CONFIG_SYS_RESERVED
# error "CONFIG_SYS_RESERVED must be defined to the value 2"
# elif CONFIG_SYS_RESERVED != 2
# error "CONFIG_SYS_RESERVED must have the value 2"
# 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
* parmeters are passed in a0-a3. a0 is reserved for the syscall number leaving
* up to thre 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 1:
*
* void up_fullcontextrestore(uint32_t *restoreregs) __attribute__ ((noreturn));
*/
#define SYS_restore_context (1)
#define up_fullcontextrestore(restoreregs) \
(void)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) \
(void)sys_call2(SYS_switch_context, (uintptr_t)saveregs, (uintptr_t)restoreregs)
#endif /* __ASSEMBLY__ */
/****************************************************************************
* Public Types
****************************************************************************/
/****************************************************************************
* Inline functions
****************************************************************************/
#ifndef __ASSEMBLY__
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* 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.
*
****************************************************************************/
EXTERN uintptr_t sys_call0(unsigned int nbr);
/****************************************************************************
* Name: up_syscall1
*
* Description:
* System call SYS_ argument and one additional parameter.
*
****************************************************************************/
EXTERN uintptr_t sys_call1(unsigned int nbr, uintptr_t parm1);
/****************************************************************************
* Name: up_syscall2
*
* Description:
* System call SYS_ argument and two additional parameters.
*
****************************************************************************/
EXTERN 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.
*
****************************************************************************/
EXTERN 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 */
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