mirror of
https://github.com/apache/nuttx.git
synced 2026-09-11 21:20:10 +00:00
190a2e306c
This removes 2 reserved system calls and replaces them with an ASM snippet. The result removes an unnecessary ecall from the process startup logic, as well as ensures the stacks are FULLY unwound when the user process starts. The logic is ported from ARM64.
345 lines
9.8 KiB
C
345 lines
9.8 KiB
C
/****************************************************************************
|
|
* 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>
|
|
|
|
#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 6
|
|
#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).
|
|
*/
|
|
|
|
/* 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)
|
|
|
|
#ifndef CONFIG_BUILD_FLAT
|
|
|
|
/* SYS call 4:
|
|
*
|
|
* void signal_handler(_sa_sigaction_t sighand, int signo,
|
|
* siginfo_t *info, void *ucontext);
|
|
*/
|
|
|
|
#define SYS_signal_handler (4)
|
|
|
|
/* SYS call 5:
|
|
*
|
|
* void signal_handler_return(void);
|
|
*/
|
|
|
|
#define SYS_signal_handler_return (5)
|
|
#endif /* !CONFIG_BUILD_FLAT */
|
|
|
|
/****************************************************************************
|
|
* Public Types
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Inline functions
|
|
****************************************************************************/
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
#ifdef __cplusplus
|
|
#define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
long smh_call(unsigned int nbr, void *parm);
|
|
|
|
#if defined(CONFIG_ARCH_USE_S_MODE) && defined(__KERNEL__)
|
|
uintptr_t sys_call0(unsigned int nbr);
|
|
uintptr_t sys_call1(unsigned int nbr, uintptr_t parm1);
|
|
uintptr_t sys_call2(unsigned int nbr, uintptr_t parm1, uintptr_t parm2);
|
|
uintptr_t sys_call3(unsigned int nbr, uintptr_t parm1, uintptr_t parm2,
|
|
uintptr_t parm3);
|
|
uintptr_t sys_call4(unsigned int nbr, uintptr_t parm1, uintptr_t parm2,
|
|
uintptr_t parm3, uintptr_t parm4);
|
|
uintptr_t sys_call5(unsigned int nbr, uintptr_t parm1, uintptr_t parm2,
|
|
uintptr_t parm3, uintptr_t parm4, uintptr_t parm5);
|
|
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);
|
|
#else
|
|
/****************************************************************************
|
|
* 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;
|
|
}
|
|
#endif
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* __ARCH_RISCV_INCLUDE_SYSCALL_H */
|