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nuttx/arch/risc-v/include/syscall.h
Petro Karashchenko 9b7f9867aa arch/risc-v: use STACK_FRAME_SIZE for in S-mode syscall asm 
Signed-off-by: Petro Karashchenko <petro.karashchenko@gmail.com>
2022-04-04 12:05:53 +08:00

370 lines
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C
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/****************************************************************************
* arch/risc-v/include/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_SYSCALL_H
#define __ARCH_RISCV_INCLUDE_SYSCALL_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <arch/arch.h>
#ifndef __ASSEMBLY__
# include <stdint.h>
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define SYS_syscall 0x00
/* Configuration ************************************************************/
/* This logic uses three system calls {0,1,2} for context switching and one
* for the syscall return. So a minimum of four syscall values must be
* reserved. If CONFIG_BUILD_FLAT isn't defined, then four more syscall
* values must be reserved.
*/
#ifndef CONFIG_BUILD_FLAT
# define CONFIG_SYS_RESERVED 8
#else
# define CONFIG_SYS_RESERVED 4
#endif
/* RV64GC system calls ******************************************************/
/* SYS call 1 and 2 are defined for internal use by the RISC-V port (see
* arch/risc-v/include/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).
*/
#define SYS_save_context (0)
/* SYS call 1:
*
* void riscv_fullcontextrestore(uintptr_t *restoreregs) noreturn_function;
*/
#define SYS_restore_context (1)
/* SYS call 2:
*
* void riscv_switchcontext(uintptr_t **saveregs, uintptr_t *restoreregs);
*/
#define SYS_switch_context (2)
#ifdef CONFIG_LIB_SYSCALL
/* SYS call 3:
*
* void riscv_syscall_return(void);
*/
#define SYS_syscall_return (3)
#endif /* CONFIG_LIB_SYSCALL */
#ifndef CONFIG_BUILD_FLAT
/* SYS call 4:
*
* void up_task_start(main_t taskentry, int argc, char *argv[])
* noreturn_function;
*/
#define SYS_task_start (4)
/* SYS call 5:
*
* void up_pthread_start(pthread_startroutine_t startup,
* pthread_startroutine_t entrypt, pthread_addr_t arg)
* noreturn_function
*/
#define SYS_pthread_start (5)
/* SYS call 6:
*
* void signal_handler(_sa_sigaction_t sighand, int signo,
* siginfo_t *info, void *ucontext);
*/
#define SYS_signal_handler (6)
/* SYS call 7:
*
* void signal_handler_return(void);
*/
#define SYS_signal_handler_return (7)
#endif /* !CONFIG_BUILD_FLAT */
#if defined (CONFIG_ARCH_USE_S_MODE) && defined (__KERNEL__)
# define ASM_SYS_CALL \
" addi sp, sp, -" STACK_FRAME_SIZE "\n" /* Make room */ \
REGSTORE " ra, 0(sp)\n" /* Save ra */ \
" jal ra, riscv_dispatch_syscall\n" /* Dispatch (modifies ra) */ \
REGLOAD " ra, 0(sp)\n" /* Restore ra */ \
" addi sp, sp, " STACK_FRAME_SIZE "\n" /* Restore sp */
#else
# define ASM_SYS_CALL \
"ecall"
#endif
/****************************************************************************
* 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
(
ASM_SYS_CALL
:: "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
(
ASM_SYS_CALL
:: "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
(
ASM_SYS_CALL
:: "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
(
ASM_SYS_CALL
:: "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
(
ASM_SYS_CALL
:: "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
(
ASM_SYS_CALL
:: "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
(
ASM_SYS_CALL
:: "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_SYSCALL_H */
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