249 lines
7.2 KiB
C
249 lines
7.2 KiB
C
/****************************************************************************
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* arch/arm/include/armv7-m/syscall.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* This file should never be included directly but, rather, only indirectly
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* through include/syscall.h or include/sys/sycall.h
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*/
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#ifndef __ARCH_ARM_INCLUDE_ARMV7_M_SYSCALL_H
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#define __ARCH_ARM_INCLUDE_ARMV7_M_SYSCALL_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifndef __ASSEMBLY__
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# include <stdint.h>
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#endif
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/****************************************************************************
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* Pre-processor Prototypes
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****************************************************************************/
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/* This is the value used as the argument to the SVC instruction. It is not
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* used.
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*/
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#define SYS_syscall 0x00
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#define SYS_smhcall 0xab
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/* The SYS_signal_handler_return is executed here... its value is not always
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* available in this context and so is assumed to be 7.
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*/
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#ifndef SYS_signal_handler_return
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# define SYS_signal_handler_return (7)
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#elif SYS_signal_handler_return != 7
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# error "SYS_signal_handler_return was assumed to be 7"
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Inline functions
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****************************************************************************/
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#ifndef __ASSEMBLY__
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/* SVC call with SYS_ call number and no parameters */
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static inline uintptr_t sys_call0(unsigned int nbr)
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{
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register long reg0 __asm__("r0") = (long)(nbr);
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__asm__ __volatile__
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(
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"svc %1"
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: "=r"(reg0)
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: "i"(SYS_syscall), "r"(reg0)
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: "memory"
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);
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return reg0;
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}
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/* SVC call with SYS_ call number and one parameter */
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static inline uintptr_t sys_call1(unsigned int nbr, uintptr_t parm1)
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{
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register long reg0 __asm__("r0") = (long)(nbr);
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register long reg1 __asm__("r1") = (long)(parm1);
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__asm__ __volatile__
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(
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"svc %1"
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: "=r"(reg0)
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: "i"(SYS_syscall), "r"(reg0), "r"(reg1)
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: "memory"
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);
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return reg0;
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}
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/* SVC call with SYS_ call number and two parameters */
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static inline uintptr_t sys_call2(unsigned int nbr, uintptr_t parm1,
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uintptr_t parm2)
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{
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register long reg0 __asm__("r0") = (long)(nbr);
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register long reg2 __asm__("r2") = (long)(parm2);
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register long reg1 __asm__("r1") = (long)(parm1);
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__asm__ __volatile__
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(
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"svc %1"
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: "=r"(reg0)
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: "i"(SYS_syscall), "r"(reg0), "r"(reg1), "r"(reg2)
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: "memory"
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);
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return reg0;
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}
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/* SVC call with SYS_ call number and three parameters */
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static inline uintptr_t sys_call4(unsigned int nbr, uintptr_t parm1,
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uintptr_t parm2, uintptr_t parm3,
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uintptr_t parm4);
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static inline uintptr_t sys_call3(unsigned int nbr, uintptr_t parm1,
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uintptr_t parm2, uintptr_t parm3)
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{
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return sys_call4(nbr, parm1, parm2, parm3, 0);
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}
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/* SVC call with SYS_ call number and four parameters.
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*
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* NOTE the nonstandard parameter passing: parm4 is in R4
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*/
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static inline uintptr_t sys_call4(unsigned int nbr, uintptr_t parm1,
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uintptr_t parm2, uintptr_t parm3,
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uintptr_t parm4)
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{
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register long reg0 __asm__("r0") = (long)(nbr);
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register long reg4 __asm__("r4") = (long)(parm4);
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register long reg3 __asm__("r3") = (long)(parm3);
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register long reg2 __asm__("r2") = (long)(parm2);
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register long reg1 __asm__("r1") = (long)(parm1);
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__asm__ __volatile__
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(
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"svc %1"
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: "=r"(reg0)
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: "i"(SYS_syscall), "r"(reg0), "r"(reg1), "r"(reg2),
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"r"(reg3), "r"(reg4)
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: "memory"
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);
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return reg0;
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}
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/* SVC call with SYS_ call number and five parameters.
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*
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* NOTE the nonstandard parameter passing: parm4 and parm5 are in R4 and R5
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*/
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static inline uintptr_t sys_call6(unsigned int nbr, uintptr_t parm1,
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uintptr_t parm2, uintptr_t parm3,
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uintptr_t parm4, uintptr_t parm5,
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uintptr_t parm6);
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static inline uintptr_t sys_call5(unsigned int nbr, uintptr_t parm1,
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uintptr_t parm2, uintptr_t parm3,
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uintptr_t parm4, uintptr_t parm5)
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{
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return sys_call6(nbr, parm1, parm2, parm3, parm4, parm5, 0);
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}
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/* SVC call with SYS_ call number and six parameters.
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*
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* NOTE the nonstandard parameter passing: parm4-parm6 are in R4-R6
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*/
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static inline uintptr_t sys_call6(unsigned int nbr, uintptr_t parm1,
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uintptr_t parm2, uintptr_t parm3,
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uintptr_t parm4, uintptr_t parm5,
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uintptr_t parm6)
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{
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register long reg0 __asm__("r0") = (long)(nbr);
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register long reg6 __asm__("r6") = (long)(parm6);
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register long reg5 __asm__("r5") = (long)(parm5);
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register long reg4 __asm__("r4") = (long)(parm4);
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register long reg3 __asm__("r3") = (long)(parm3);
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register long reg2 __asm__("r2") = (long)(parm2);
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register long reg1 __asm__("r1") = (long)(parm1);
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__asm__ __volatile__
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(
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"svc %1"
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: "=r"(reg0)
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: "i"(SYS_syscall), "r"(reg0), "r"(reg1), "r"(reg2),
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"r"(reg3), "r"(reg4), "r"(reg5), "r"(reg6)
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: "memory"
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);
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return reg0;
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}
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/* semihosting(SMH) call with call number and one parameter */
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static inline long smh_call(unsigned int nbr, void *parm)
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{
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register long reg0 __asm__("r0") = (long)(nbr);
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register long reg1 __asm__("r1") = (long)(parm);
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__asm__ __volatile__
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(
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"bkpt %1"
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: "=r"(reg0)
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: "i"(SYS_smhcall), "r"(reg0), "r"(reg1)
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: "memory"
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);
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return reg0;
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}
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __ARCH_ARM_INCLUDE_ARMV7_M_SYSCALL_H */
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