/**************************************************************************** * 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 #ifndef __ASSEMBLY__ # include #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 8 #else # define CONFIG_SYS_RESERVED 4 #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 */ #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 */ /**************************************************************************** * 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__ # if defined(CONFIG_ARCH_ARMV6M) || \ defined(CONFIG_ARCH_ARMV7M) || \ defined(CONFIG_ARCH_ARMV8M) # 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 # if defined(CONFIG_ARCH_ARMV6M) || \ defined(CONFIG_ARCH_ARMV7M) || \ defined(CONFIG_ARCH_ARMV8M) # 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 /**************************************************************************** * 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 */