| /* |
| * Copyright (c) 2018 Linaro Limited. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /** |
| * @file |
| * @brief ARM specific syscall header |
| * |
| * This header contains the ARM specific syscall interface. It is |
| * included by the syscall interface architecture-abstraction header |
| * (include/arch/syscall.h) |
| */ |
| |
| #ifndef ZEPHYR_INCLUDE_ARCH_ARM_AARCH32_SYSCALL_H_ |
| #define ZEPHYR_INCLUDE_ARCH_ARM_AARCH32_SYSCALL_H_ |
| |
| #define _SVC_CALL_CONTEXT_SWITCH 0 |
| #define _SVC_CALL_IRQ_OFFLOAD 1 |
| #define _SVC_CALL_RUNTIME_EXCEPT 2 |
| #define _SVC_CALL_SYSTEM_CALL 3 |
| |
| #ifdef CONFIG_USERSPACE |
| #ifndef _ASMLANGUAGE |
| |
| #include <zephyr/types.h> |
| #include <stdbool.h> |
| #include <arch/arm/aarch32/cortex_m/cmsis.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| |
| /* Syscall invocation macros. arm-specific machine constraints used to ensure |
| * args land in the proper registers. |
| */ |
| static inline uintptr_t arch_syscall_invoke6(uintptr_t arg1, uintptr_t arg2, |
| uintptr_t arg3, uintptr_t arg4, |
| uintptr_t arg5, uintptr_t arg6, |
| uintptr_t call_id) |
| { |
| register u32_t ret __asm__("r0") = arg1; |
| register u32_t r1 __asm__("r1") = arg2; |
| register u32_t r2 __asm__("r2") = arg3; |
| register u32_t r3 __asm__("r3") = arg4; |
| register u32_t r4 __asm__("r4") = arg5; |
| register u32_t r5 __asm__("r5") = arg6; |
| register u32_t r6 __asm__("r6") = call_id; |
| |
| __asm__ volatile("svc %[svid]\n" |
| : "=r"(ret) |
| : [svid] "i" (_SVC_CALL_SYSTEM_CALL), |
| "r" (ret), "r" (r1), "r" (r2), "r" (r3), |
| "r" (r4), "r" (r5), "r" (r6) |
| : "r8", "memory", "ip"); |
| |
| return ret; |
| } |
| |
| static inline uintptr_t arch_syscall_invoke5(uintptr_t arg1, uintptr_t arg2, |
| uintptr_t arg3, uintptr_t arg4, |
| uintptr_t arg5, |
| uintptr_t call_id) |
| { |
| register u32_t ret __asm__("r0") = arg1; |
| register u32_t r1 __asm__("r1") = arg2; |
| register u32_t r2 __asm__("r2") = arg3; |
| register u32_t r3 __asm__("r3") = arg4; |
| register u32_t r4 __asm__("r4") = arg5; |
| register u32_t r6 __asm__("r6") = call_id; |
| |
| __asm__ volatile("svc %[svid]\n" |
| : "=r"(ret) |
| : [svid] "i" (_SVC_CALL_SYSTEM_CALL), |
| "r" (ret), "r" (r1), "r" (r2), "r" (r3), |
| "r" (r4), "r" (r6) |
| : "r8", "memory", "ip"); |
| |
| return ret; |
| } |
| |
| static inline uintptr_t arch_syscall_invoke4(uintptr_t arg1, uintptr_t arg2, |
| uintptr_t arg3, uintptr_t arg4, |
| uintptr_t call_id) |
| { |
| register u32_t ret __asm__("r0") = arg1; |
| register u32_t r1 __asm__("r1") = arg2; |
| register u32_t r2 __asm__("r2") = arg3; |
| register u32_t r3 __asm__("r3") = arg4; |
| register u32_t r6 __asm__("r6") = call_id; |
| |
| __asm__ volatile("svc %[svid]\n" |
| : "=r"(ret) |
| : [svid] "i" (_SVC_CALL_SYSTEM_CALL), |
| "r" (ret), "r" (r1), "r" (r2), "r" (r3), |
| "r" (r6) |
| : "r8", "memory", "ip"); |
| |
| return ret; |
| } |
| |
| static inline uintptr_t arch_syscall_invoke3(uintptr_t arg1, uintptr_t arg2, |
| uintptr_t arg3, |
| uintptr_t call_id) |
| { |
| register u32_t ret __asm__("r0") = arg1; |
| register u32_t r1 __asm__("r1") = arg2; |
| register u32_t r2 __asm__("r2") = arg3; |
| register u32_t r6 __asm__("r6") = call_id; |
| |
| __asm__ volatile("svc %[svid]\n" |
| : "=r"(ret) |
| : [svid] "i" (_SVC_CALL_SYSTEM_CALL), |
| "r" (ret), "r" (r1), "r" (r2), "r" (r6) |
| : "r8", "memory", "r3", "ip"); |
| |
| return ret; |
| } |
| |
| static inline uintptr_t arch_syscall_invoke2(uintptr_t arg1, uintptr_t arg2, |
| uintptr_t call_id) |
| { |
| register u32_t ret __asm__("r0") = arg1; |
| register u32_t r1 __asm__("r1") = arg2; |
| register u32_t r6 __asm__("r6") = call_id; |
| |
| __asm__ volatile("svc %[svid]\n" |
| : "=r"(ret) |
| : [svid] "i" (_SVC_CALL_SYSTEM_CALL), |
| "r" (ret), "r" (r1), "r" (r6) |
| : "r8", "memory", "r2", "r3", "ip"); |
| |
| return ret; |
| } |
| |
| static inline uintptr_t arch_syscall_invoke1(uintptr_t arg1, |
| uintptr_t call_id) |
| { |
| register u32_t ret __asm__("r0") = arg1; |
| register u32_t r6 __asm__("r6") = call_id; |
| |
| __asm__ volatile("svc %[svid]\n" |
| : "=r"(ret) |
| : [svid] "i" (_SVC_CALL_SYSTEM_CALL), |
| "r" (ret), "r" (r6) |
| : "r8", "memory", "r1", "r2", "r3", "ip"); |
| return ret; |
| } |
| |
| static inline uintptr_t arch_syscall_invoke0(uintptr_t call_id) |
| { |
| register u32_t ret __asm__("r0"); |
| register u32_t r6 __asm__("r6") = call_id; |
| |
| __asm__ volatile("svc %[svid]\n" |
| : "=r"(ret) |
| : [svid] "i" (_SVC_CALL_SYSTEM_CALL), |
| "r" (ret), "r" (r6) |
| : "r8", "memory", "r1", "r2", "r3", "ip"); |
| |
| return ret; |
| } |
| |
| static inline bool arch_is_user_context(void) |
| { |
| u32_t value; |
| |
| /* check for handler mode */ |
| __asm__ volatile("mrs %0, IPSR\n\t" : "=r"(value)); |
| if (value) { |
| return false; |
| } |
| |
| /* if not handler mode, return mode information */ |
| __asm__ volatile("mrs %0, CONTROL\n\t" : "=r"(value)); |
| return (value & CONTROL_nPRIV_Msk) ? true : false; |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _ASMLANGUAGE */ |
| #endif /* CONFIG_USERSPACE */ |
| #endif /* ZEPHYR_INCLUDE_ARCH_ARM_AARCH32_SYSCALL_H_ */ |