syscall.h

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/*
 * Copyright (c) 2019 Carlo Caione <ccaione@baylibre.com>
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_ARCH_ARM64_SYSCALL_H_
#define ZEPHYR_INCLUDE_ARCH_ARM64_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/arm64/lib_helpers.h>
#include <arch/arm64/tpidrro_el0.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 uint64_t ret __asm__("x0") = arg1;
        register uint64_t r1 __asm__("x1") = arg2;
        register uint64_t r2 __asm__("x2") = arg3;
        register uint64_t r3 __asm__("x3") = arg4;
        register uint64_t r4 __asm__("x4") = arg5;
        register uint64_t r5 __asm__("x5") = arg6;
        register uint64_t r8 __asm__("x8") = 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" (r8)
                         : "memory");
 
        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 uint64_t ret __asm__("x0") = arg1;
        register uint64_t r1 __asm__("x1") = arg2;
        register uint64_t r2 __asm__("x2") = arg3;
        register uint64_t r3 __asm__("x3") = arg4;
        register uint64_t r4 __asm__("x4") = arg5;
        register uint64_t r8 __asm__("x8") = 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" (r8)
                         : "memory");
 
        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 uint64_t ret __asm__("x0") = arg1;
        register uint64_t r1 __asm__("x1") = arg2;
        register uint64_t r2 __asm__("x2") = arg3;
        register uint64_t r3 __asm__("x3") = arg4;
        register uint64_t r8 __asm__("x8") = call_id;
 
        __asm__ volatile("svc %[svid]\n"
                         : "=r"(ret)
                         : [svid] "i" (_SVC_CALL_SYSTEM_CALL),
                           "r" (ret), "r" (r1), "r" (r2), "r" (r3),
                           "r" (r8)
                         : "memory");
 
        return ret;
}
 
static inline uintptr_t arch_syscall_invoke3(uintptr_t arg1, uintptr_t arg2,
                                             uintptr_t arg3,
                                             uintptr_t call_id)
{
        register uint64_t ret __asm__("x0") = arg1;
        register uint64_t r1 __asm__("x1") = arg2;
        register uint64_t r2 __asm__("x2") = arg3;
        register uint64_t r8 __asm__("x8") = call_id;
 
        __asm__ volatile("svc %[svid]\n"
                         : "=r"(ret)
                         : [svid] "i" (_SVC_CALL_SYSTEM_CALL),
                           "r" (ret), "r" (r1), "r" (r2), "r" (r8)
                         : "memory");
 
        return ret;
}
 
static inline uintptr_t arch_syscall_invoke2(uintptr_t arg1, uintptr_t arg2,
                                             uintptr_t call_id)
{
        register uint64_t ret __asm__("x0") = arg1;
        register uint64_t r1 __asm__("x1") = arg2;
        register uint64_t r8 __asm__("x8") = call_id;
 
        __asm__ volatile("svc %[svid]\n"
                         : "=r"(ret)
                         : [svid] "i" (_SVC_CALL_SYSTEM_CALL),
                           "r" (ret), "r" (r1), "r" (r8)
                         : "memory");
 
        return ret;
}
 
static inline uintptr_t arch_syscall_invoke1(uintptr_t arg1,
                                             uintptr_t call_id)
{
        register uint64_t ret __asm__("x0") = arg1;
        register uint64_t r8 __asm__("x8") = call_id;
 
        __asm__ volatile("svc %[svid]\n"
                         : "=r"(ret)
                         : [svid] "i" (_SVC_CALL_SYSTEM_CALL),
                           "r" (ret), "r" (r8)
                         : "memory");
        return ret;
}
 
static inline uintptr_t arch_syscall_invoke0(uintptr_t call_id)
{
        register uint64_t ret __asm__("x0");
        register uint64_t r8 __asm__("x8") = call_id;
 
        __asm__ volatile("svc %[svid]\n"
                         : "=r"(ret)
                         : [svid] "i" (_SVC_CALL_SYSTEM_CALL),
                           "r" (ret), "r" (r8)
                         : "memory");
 
        return ret;
}
 
static inline bool arch_is_user_context(void)
{
        return (read_tpidrro_el0() & TPIDRROEL0_IN_EL0) != 0;
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* _ASMLANGUAGE */
#endif /* CONFIG_USERSPACE */
 
#endif /* ZEPHYR_INCLUDE_ARCH_ARM64_SYSCALL_H_ */