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nuttx/arch/risc-v/include/rv64gc/syscall.h
hotislandn b4b175cb7f arch:rv64:add memory clobber to inline asm for syscall. 
Signed-off-by: hotislandn <hotislandn@hotmail.com>
2021-04-03 00:54:23 -05:00

350 lines
9.7 KiB
C
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/****************************************************************************
* arch/risc-v/include/rv64gc/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_RISCV_INCLUDE_RV64GC_SYSCALL_H
#define __ARCH_RISCV_INCLUDE_RV64GC_SYSCALL_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifndef __ASSEMBLY__
# include <stdint.h>
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define SYS_syscall 0x00
/* The SYS_signal_handler_return is executed here... its value is not always
* available in this context and so is assumed to be 7.
*/
#ifndef SYS_signal_handler_return
# define SYS_signal_handler_return (7)
#elif SYS_signal_handler_return != 7
# error "SYS_signal_handler_return was assumed to be 7"
#endif
/* Configuration ************************************************************/
/* SYS call 1 and 2 are defined for internal use by the RISC-V port (see
* arch/risc-v/include/rv64gc/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).
*/
#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 **********************************************************/
#ifndef __ASSEMBLY__
/* Context switching system calls *******************************************/
/* SYS call 0:
*
* int riscv_saveusercontext(uint64_t *saveregs);
*
* Return:
* 0: Normal Return
* 1: Context Switch Return
*/
#define SYS_save_context (0)
#define riscv_saveusercontext(saveregs) \
(int)sys_call1(SYS_save_context, (uintptr_t)saveregs)
/* SYS call 1:
*
* void riscv_fullcontextrestore(uint32_t *restoreregs) noreturn_function;
*/
#define SYS_restore_context (1)
#define riscv_fullcontextrestore(restoreregs) \
sys_call1(SYS_restore_context, (uintptr_t)restoreregs)
/* SYS call 2:
*
* void riscv_switchcontext(uint32_t *saveregs, uint32_t *restoreregs);
*/
#define SYS_switch_context (2)
#define riscv_switchcontext(saveregs, restoreregs) \
sys_call2(SYS_switch_context, (uintptr_t)saveregs, (uintptr_t)restoreregs)
#ifdef CONFIG_BUILD_KERNEL
/* SYS call 3:
*
* void riscv_syscall_return(void);
*/
#define SYS_syscall_return (3)
#define riscv_syscall_return() 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: sys_call0
*
* Description:
* System call SYS_ argument and no additional parameters.
*
****************************************************************************/
static inline uintptr_t sys_call0(unsigned int nbr)
{
register long r0 asm("a0") = (long)(nbr);
asm volatile
(
"ecall"
:: "r"(r0)
: "memory"
);
asm volatile("nop" : "=r"(r0));
return r0;
}
/****************************************************************************
* Name: sys_call1
*
* Description:
* System call SYS_ argument and one additional parameter.
*
****************************************************************************/
static inline uintptr_t sys_call1(unsigned int nbr, uintptr_t parm1)
{
register long r0 asm("a0") = (long)(nbr);
register long r1 asm("a1") = (long)(parm1);
asm volatile
(
"ecall"
:: "r"(r0), "r"(r1)
: "memory"
);
asm volatile("nop" : "=r"(r0));
return r0;
}
/****************************************************************************
* Name: sys_call2
*
* Description:
* System call SYS_ argument and two additional parameters.
*
****************************************************************************/
static inline uintptr_t sys_call2(unsigned int nbr, uintptr_t parm1,
uintptr_t parm2)
{
register long r0 asm("a0") = (long)(nbr);
register long r1 asm("a1") = (long)(parm1);
register long r2 asm("a2") = (long)(parm2);
asm volatile
(
"ecall"
:: "r"(r0), "r"(r1), "r"(r2)
: "memory"
);
asm volatile("nop" : "=r"(r0));
return r0;
}
/****************************************************************************
* Name: sys_call3
*
* Description:
* System call SYS_ argument and three additional parameters.
*
****************************************************************************/
static inline uintptr_t sys_call3(unsigned int nbr, uintptr_t parm1,
uintptr_t parm2, uintptr_t parm3)
{
register long r0 asm("a0") = (long)(nbr);
register long r1 asm("a1") = (long)(parm1);
register long r2 asm("a2") = (long)(parm2);
register long r3 asm("a3") = (long)(parm3);
asm volatile
(
"ecall"
:: "r"(r0), "r"(r1), "r"(r2), "r"(r3)
: "memory"
);
asm volatile("nop" : "=r"(r0));
return r0;
}
/****************************************************************************
* Name: sys_call4
*
* Description:
* System call SYS_ argument and four additional parameters.
*
****************************************************************************/
static inline uintptr_t sys_call4(unsigned int nbr, uintptr_t parm1,
uintptr_t parm2, uintptr_t parm3,
uintptr_t parm4)
{
register long r0 asm("a0") = (long)(nbr);
register long r1 asm("a1") = (long)(parm1);
register long r2 asm("a2") = (long)(parm2);
register long r3 asm("a3") = (long)(parm3);
register long r4 asm("a4") = (long)(parm4);
asm volatile
(
"ecall"
:: "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4)
: "memory"
);
asm volatile("nop" : "=r"(r0));
return r0;
}
/****************************************************************************
* Name: sys_call5
*
* Description:
* System call SYS_ argument and five additional parameters.
*
****************************************************************************/
static inline uintptr_t sys_call5(unsigned int nbr, uintptr_t parm1,
uintptr_t parm2, uintptr_t parm3,
uintptr_t parm4, uintptr_t parm5)
{
register long r0 asm("a0") = (long)(nbr);
register long r1 asm("a1") = (long)(parm1);
register long r2 asm("a2") = (long)(parm2);
register long r3 asm("a3") = (long)(parm3);
register long r4 asm("a4") = (long)(parm4);
register long r5 asm("a5") = (long)(parm5);
asm volatile
(
"ecall"
:: "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r5)
: "memory"
);
asm volatile("nop" : "=r"(r0));
return r0;
}
/****************************************************************************
* Name: sys_call6
*
* Description:
* System call SYS_ argument and six additional parameters.
*
****************************************************************************/
static inline uintptr_t sys_call6(unsigned int nbr, uintptr_t parm1,
uintptr_t parm2, uintptr_t parm3,
uintptr_t parm4, uintptr_t parm5,
uintptr_t parm6)
{
register long r0 asm("a0") = (long)(nbr);
register long r1 asm("a1") = (long)(parm1);
register long r2 asm("a2") = (long)(parm2);
register long r3 asm("a3") = (long)(parm3);
register long r4 asm("a4") = (long)(parm4);
register long r5 asm("a5") = (long)(parm5);
register long r6 asm("a6") = (long)(parm6);
asm volatile
(
"ecall"
:: "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r5), "r"(r6)
: "memory"
);
asm volatile("nop" : "=r"(r0));
return r0;
}
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_RISCV_INCLUDE_RV64GC_SYSCALL_H */
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