/****************************************************************************
* arch/arm/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_ARM_INCLUDE_SYSCALL_H
#define __ARCH_ARM_INCLUDE_SYSCALL_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifndef __ASSEMBLY__
# include <stdint.h>
#endif
/****************************************************************************
* Pre-processor Prototypes
****************************************************************************/
#define SYS_syscall 0x00
#if defined(__thumb__) || defined(__thumb2__) || \
defined(__THUMB_AWARE__) || defined(__THUMB2_AWARE__)
# define SYS_smhcall 0xab
#else
# define SYS_smhcall 0x123456
#endif
/* 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 9
#else
# define CONFIG_SYS_RESERVED 5
#endif
/* Cortex-M system calls ****************************************************/
/* SYS call 1:
*
* void arm_fullcontextrestore(uint32_t *restoreregs) noreturn_function;
*/
#define SYS_restore_context (1)
/* SYS call 2:
*
* void arm_switchcontext(uint32_t **saveregs, uint32_t *restoreregs);
*/
#define SYS_switch_context (2)
#ifdef CONFIG_LIB_SYSCALL
/* SYS call 3:
*
* void arm_syscall_return(void);
*/
#define SYS_syscall_return (3)
#endif /* CONFIG_LIB_SYSCALL */
/* SYS call 4:
*
* void _assert(const char *filename, int linenum, const char *msg);
*/
#define SYS_assert_handler (4)
#ifndef CONFIG_BUILD_FLAT
/* SYS call 5:
*
* void up_task_start(main_t taskentry, int argc, char *argv[])
* noreturn_function;
*/
#define SYS_task_start (5)
/* SYS call 6:
*
* void up_pthread_start((pthread_startroutine_t startup,
* pthread_startroutine_t entrypt, pthread_addr_t arg)
* noreturn_function
*/
#define SYS_pthread_start (6)
/* SYS call 7:
*
* void signal_handler(_sa_sigaction_t sighand,
* int signo, siginfo_t *info,
* void *ucontext);
*/
#define SYS_signal_handler (7)
/* SYS call 8:
*
* void signal_handler_return(void);
*/
#define SYS_signal_handler_return (8)
#endif /* !CONFIG_BUILD_FLAT */
/****************************************************************************
* Public Types
****************************************************************************/
/****************************************************************************
* Inline functions
****************************************************************************/
#ifndef __ASSEMBLY__
/* SVC with SYS_ call number and no parameters */
#ifdef __ghs__
# define sys_call0(nbr) \
({ \
uintptr_t ret; \
__asm__ __volatile__ \
( \
"mov r0, %2\n\t" \
"svc %1\n\t" \
"mov %0, r0" \
: "=r"(ret) \
: "i"(SYS_syscall), "r"((uintptr_t)nbr) \
: "memory", "r0" \
); \
ret; \
})
#else
# define sys_call0(nbr) \
({ \
register uintptr_t reg0 __asm__("r0") = (uintptr_t)(nbr); \
__asm__ __volatile__ \
( \
"svc %1" \
: "=r"(reg0) \
: "i"(SYS_syscall), "r"(reg0) \
: "memory" \
); \
reg0; \
})
#endif
/* SVC with SYS_ call number and one parameter */
#ifdef __ghs__
# define sys_call1(nbr, parm1) \
({ \
uintptr_t ret; \
__asm__ __volatile__ \
( \
"mov r0, %2\n\t" \
"mov r1, %3\n\t" \
"svc %1\n\t" \
"mov %0, r0" \
: "=r"(ret) \
: "i"(SYS_syscall), "r"((uintptr_t)nbr), \
"r"((uintptr_t)parm1) \
: "memory", "r0", "r1" \
); \
ret; \
})
#else
# define sys_call1(nbr, parm1) \
({ \
register uintptr_t reg1 __asm__("r1") = (uintptr_t)(parm1); \
register uintptr_t reg0 __asm__("r0") = (uintptr_t)(nbr); \
__asm__ __volatile__ \
( \
"svc %1" \
: "=r"(reg0) \
: "i"(SYS_syscall), "r"(reg0), "r"(reg1) \
: "memory" \
); \
reg0; \
})
#endif
/* SVC with SYS_ call number and two parameters */
#ifdef __ghs__
# define sys_call2(nbr, parm1, parm2) \
({ \
uintptr_t ret; \
__asm__ __volatile__ \
( \
"mov r0, %2\n\t" \
"mov r1, %3\n\t" \
"mov r2, %4\n\t" \
"svc %1\n\t" \
"mov %0, r0" \
: "=r"(ret) \
: "i"(SYS_syscall), "r"((uintptr_t)nbr), \
"r"((uintptr_t)parm1), "r"((uintptr_t)parm2) \
: "memory", "r0", "r1", "r2" \
); \
ret; \
})
#else
# define sys_call2(nbr, parm1, parm2) \
({ \
register uintptr_t reg2 __asm__("r2") = (uintptr_t)(parm2); \
register uintptr_t reg1 __asm__("r1") = (uintptr_t)(parm1); \
register uintptr_t reg0 __asm__("r0") = (uintptr_t)(nbr); \
__asm__ __volatile__ \
( \
"svc %1" \
: "=r"(reg0) \
: "i"(SYS_syscall), "r"(reg0), "r"(reg1), "r"(reg2) \
: "memory" \
); \
reg0; \
})
#endif
/* SVC with SYS_ call number and three parameters */
#ifdef __ghs__
# define sys_call3(nbr, parm1, parm2, parm3) \
({ \
uintptr_t ret; \
__asm__ __volatile__ \
( \
"mov r0, %2\n\t" \
"mov r1, %3\n\t" \
"mov r2, %4\n\t" \
"mov r3, %5\n\t" \
"svc %1\n\t" \
"mov %0, r0" \
: "=r"(ret) \
: "i"(SYS_syscall), "r"((uintptr_t)nbr), "r"((uintptr_t)parm1), \
"r"((uintptr_t)parm2), "r"((uintptr_t)parm3) \
: "memory", "r0", "r1", "r2", "r3" \
); \
ret; \
})
#else
# define sys_call3(nbr, parm1, parm2, parm3) \
({ \
register uintptr_t reg3 __asm__("r3") = (uintptr_t)(parm3); \
register uintptr_t reg2 __asm__("r2") = (uintptr_t)(parm2); \
register uintptr_t reg1 __asm__("r1") = (uintptr_t)(parm1); \
register uintptr_t reg0 __asm__("r0") = (uintptr_t)(nbr); \
__asm__ __volatile__ \
( \
"svc %1" \
: "=r"(reg0) \
: "i"(SYS_syscall), "r"(reg0), "r"(reg1), "r"(reg2), "r"(reg3) \
: "memory" \
); \
reg0; \
})
#endif
/* SVC with SYS_ call number and four parameters */
#ifdef __ghs__
# define sys_call4(nbr, parm1, parm2, parm3, parm4) \
({ \
uintptr_t ret; \
__asm__ __volatile__ \
( \
"push {r4}\n\t" \
"mov r0, %2\n\t" \
"mov r1, %3\n\t" \
"mov r2, %4\n\t" \
"mov r3, %5\n\t" \
"mov r4, %6\n\t" \
"svc %1\n\t" \
"pop {r4}\n\t" \
"mov %0, r0" \
: "=r"(ret) \
: "i"(SYS_syscall), "r"((uintptr_t)nbr), "r"((uintptr_t)parm1), \
"r"((uintptr_t)parm2), "r"((uintptr_t)parm3), "r"((uintptr_t)parm4) \
: "memory", "r0", "r1", "r2", "r3" \
); \
ret; \
})
#else
# define sys_call4(nbr, parm1, parm2, parm3, parm4) \
({ \
register uintptr_t reg4 __asm__("r4") = (uintptr_t)(parm4); \
register uintptr_t reg3 __asm__("r3") = (uintptr_t)(parm3); \
register uintptr_t reg2 __asm__("r2") = (uintptr_t)(parm2); \
register uintptr_t reg1 __asm__("r1") = (uintptr_t)(parm1); \
register uintptr_t reg0 __asm__("r0") = (uintptr_t)(nbr); \
__asm__ __volatile__ \
( \
"svc %1" \
: "=r"(reg0) \
: "i"(SYS_syscall), "r"(reg0), "r"(reg1), "r"(reg2), \
"r"(reg3), "r"(reg4) \
: "memory" \
); \
reg0; \
})
#endif
/* SVC with SYS_ call number and five parameters */
#ifdef __ghs__
# define sys_call5(nbr, parm1, parm2, parm3, parm4, parm5) \
({ \
uintptr_t ret; \
__asm__ __volatile__ \
( \
"push {r3-r5}\n\t" \
"push {%7}\n\t" \
"push {%6}\n\t" \
"mov r0, %2\n\t" \
"mov r1, %3\n\t" \
"mov r2, %4\n\t" \
"mov r3, %5\n\t" \
"pop {r4-r5}\n\t" \
"svc %1\n\t" \
"pop {r3-r5}\n\t" \
"mov %0, r0" \
: "=r"(ret) \
: "i"(SYS_syscall), "r"((uintptr_t)nbr), "r"((uintptr_t)parm1), \
"r"((uintptr_t)parm2), "r"((uintptr_t)parm3), "r"((uintptr_t)parm4), \
"r"((uintptr_t)parm5) \
: "memory", "r0", "r1", "r2" \
); \
ret; \
})
#else
# define sys_call5(nbr, parm1, parm2, parm3, parm4, parm5) \
({ \
register uintptr_t reg5 __asm__("r5") = (uintptr_t)(parm5); \
register uintptr_t reg4 __asm__("r4") = (uintptr_t)(parm4); \
register uintptr_t reg3 __asm__("r3") = (uintptr_t)(parm3); \
register uintptr_t reg2 __asm__("r2") = (uintptr_t)(parm2); \
register uintptr_t reg1 __asm__("r1") = (uintptr_t)(parm1); \
register uintptr_t reg0 __asm__("r0") = (uintptr_t)(nbr); \
__asm__ __volatile__ \
( \
"svc %1" \
: "=r"(reg0) \
: "i"(SYS_syscall), "r"(reg0), "r"(reg1), "r"(reg2), \
"r"(reg3), "r"(reg4), "r"(reg5) \
: "memory" \
); \
reg0; \
})
#endif
/* SVC with SYS_ call number and six parameters */
#ifdef __ghs__
# define sys_call6(nbr, parm1, parm2, parm3, parm4, parm5, parm6) \
({ \
uintptr_t ret; \
__asm__ __volatile__ \
( \
"push {r2-r6}\n\t" \
"push {%8}\n\t" \
"push {%7}\n\t" \
"push {%6}\n\t" \
"push {%5}\n\t" \
"mov r0, %2\n\t" \
"mov r1, %3\n\t" \
"mov r2, %4\n\t" \
"pop {r3-r6}\n\t" \
"svc %1\n\t" \
"pop {r2-r6}\n\t" \
"mov %0, r0" \
: "=r"(ret) \
: "i"(SYS_syscall), "r"((uintptr_t)nbr), "r"((uintptr_t)parm1), \
"r"((uintptr_t)parm2), "r"((uintptr_t)parm3), "r"((uintptr_t)parm4), \
"r"((uintptr_t)parm5), "r"((uintptr_t)parm6) \
: "memory", "r0", "r1" \
); \
ret; \
})
#else
# define sys_call6(nbr, parm1, parm2, parm3, parm4, parm5, parm6) \
({ \
register uintptr_t reg6 __asm__("r6") = (uintptr_t)(parm6); \
register uintptr_t reg5 __asm__("r5") = (uintptr_t)(parm5); \
register uintptr_t reg4 __asm__("r4") = (uintptr_t)(parm4); \
register uintptr_t reg3 __asm__("r3") = (uintptr_t)(parm3); \
register uintptr_t reg2 __asm__("r2") = (uintptr_t)(parm2); \
register uintptr_t reg1 __asm__("r1") = (uintptr_t)(parm1); \
register uintptr_t reg0 __asm__("r0") = (uintptr_t)(nbr); \
__asm__ __volatile__ \
( \
"svc %1" \
: "=r"(reg0) \
: "i"(SYS_syscall), "r"(reg0), "r"(reg1), "r"(reg2), \
"r"(reg3), "r"(reg4), "r"(reg5), "r"(reg6) \
: "memory" \
); \
reg0; \
})
#endif
/* semihosting(SMH) call with call number and one parameter */
#ifdef __ghs__
# ifdef CONFIG_ARCH_ARM_M
# define smh_call(nbr, parm1) \
({ \
uintptr_t ret; \
__asm__ __volatile__ \
( \
"mov r0, %2\n\t" \
"mov r1, %3\n\t" \
"bkpt %1\n\t" \
"mov %0, r0" \
: "=r"(ret) \
: "i"(SYS_smhcall), "r"((uintptr_t)nbr), "r"((uintptr_t)parm1) \
: "memory", "r0", "r1" \
); \
ret; \
})
# else
# define smh_call(nbr, parm1) \
({ \
uintptr_t ret; \
__asm__ __volatile__ \
( \
"mov r0, %2\n\t" \
"mov r1, %3\n\t" \
"svc %1\n\t" \
"mov %0, r0" \
: "=r"(ret) \
: "i"(SYS_smhcall), "r"((uintptr_t)nbr), "r"((uintptr_t)parm1) \
: "memory", "r0", "r1" \
); \
ret; \
})
# endif
#else
# ifdef CONFIG_ARCH_ARM_M
# define smh_call(nbr, parm1) \
({ \
register uintptr_t reg1 __asm__("r1") = (uintptr_t)(parm1); \
register uintptr_t reg0 __asm__("r0") = (uintptr_t)(nbr); \
__asm__ __volatile__ \
( \
"bkpt %1" \
: "=r"(reg0) \
: "i"(SYS_smhcall), "r"(reg0), "r"(reg1) \
: "memory" \
); \
reg0; \
})
# else
# define smh_call(nbr, parm1) \
({ \
register uintptr_t reg1 __asm__("r1") = (uintptr_t)(parm1); \
register uintptr_t reg0 __asm__("r0") = (uintptr_t)(nbr); \
__asm__ __volatile__ \
( \
"svc %1" \
: "=r"(reg0) \
: "i"(SYS_smhcall), "r"(reg0), "r"(reg1) \
: "memory" \
); \
reg0; \
})
# endif
#endif
/****************************************************************************
* Name: up_assert
****************************************************************************/
#define up_assert(filename, linenum, msg) \
sys_call3(SYS_assert_handler, (uintptr_t)filename, \
(uintptr_t)linenum, (uintptr_t)msg);
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_ARM_INCLUDE_SYSCALL_H */