syscall.h

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/*
 * Copyright (c) 2018 Linaro Limited.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_ARCH_ARC_SYSCALL_H_
#define ZEPHYR_INCLUDE_ARCH_ARC_SYSCALL_H_
 
#define _TRAP_S_CALL_RUNTIME_EXCEPT             2
#define _TRAP_S_CALL_SYSTEM_CALL                3
 
#ifdef CONFIG_USERSPACE
#ifndef _ASMLANGUAGE
 
#include <zephyr/types.h>
#include <stdbool.h>
 
#ifdef CONFIG_ISA_ARCV2
#include <zephyr/arch/arc/v2/aux_regs.h>
#endif
 
#ifdef __cplusplus
extern "C" {
#endif
/* Syscall invocation macros. arc-specific machine constraints used to ensure
 * args land in the proper registers. Currently, they are all stub functions
 * just for enabling CONFIG_USERSPACE on arc w/o errors.
 */
 
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 uint32_t ret __asm__("r0") = arg1;
        register uint32_t r1 __asm__("r1") = arg2;
        register uint32_t r2 __asm__("r2") = arg3;
        register uint32_t r3 __asm__("r3") = arg4;
        register uint32_t r4 __asm__("r4") = arg5;
        register uint32_t r5 __asm__("r5") = arg6;
        register uint32_t r6 __asm__("r6") = call_id;
 
        compiler_barrier();
 
        __asm__ volatile(
                         "trap_s %[trap_s_id]\n"
                         : "=r"(ret)
                         : [trap_s_id] "i" (_TRAP_S_CALL_SYSTEM_CALL),
                           "r" (ret), "r" (r1), "r" (r2), "r" (r3),
                           "r" (r4), "r" (r5), "r" (r6));
 
        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 uint32_t ret __asm__("r0") = arg1;
        register uint32_t r1 __asm__("r1") = arg2;
        register uint32_t r2 __asm__("r2") = arg3;
        register uint32_t r3 __asm__("r3") = arg4;
        register uint32_t r4 __asm__("r4") = arg5;
        register uint32_t r6 __asm__("r6") = call_id;
 
        compiler_barrier();
 
        __asm__ volatile(
                         "trap_s %[trap_s_id]\n"
                         : "=r"(ret)
                         : [trap_s_id] "i" (_TRAP_S_CALL_SYSTEM_CALL),
                           "r" (ret), "r" (r1), "r" (r2), "r" (r3),
                           "r" (r4), "r" (r6));
 
        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 uint32_t ret __asm__("r0") = arg1;
        register uint32_t r1 __asm__("r1") = arg2;
        register uint32_t r2 __asm__("r2") = arg3;
        register uint32_t r3 __asm__("r3") = arg4;
        register uint32_t r6 __asm__("r6") = call_id;
 
        compiler_barrier();
 
        __asm__ volatile(
                         "trap_s %[trap_s_id]\n"
                         : "=r"(ret)
                         : [trap_s_id] "i" (_TRAP_S_CALL_SYSTEM_CALL),
                           "r" (ret), "r" (r1), "r" (r2), "r" (r3),
                           "r" (r6));
 
        return ret;
}
 
static inline uintptr_t arch_syscall_invoke3(uintptr_t arg1, uintptr_t arg2,
                                             uintptr_t arg3,
                                             uintptr_t call_id)
{
        register uint32_t ret __asm__("r0") = arg1;
        register uint32_t r1 __asm__("r1") = arg2;
        register uint32_t r2 __asm__("r2") = arg3;
        register uint32_t r6 __asm__("r6") = call_id;
 
        compiler_barrier();
 
        __asm__ volatile(
                         "trap_s %[trap_s_id]\n"
                         : "=r"(ret)
                         : [trap_s_id] "i" (_TRAP_S_CALL_SYSTEM_CALL),
                           "r" (ret), "r" (r1), "r" (r2), "r" (r6));
 
        return ret;
}
 
static inline uintptr_t arch_syscall_invoke2(uintptr_t arg1, uintptr_t arg2,
                                             uintptr_t call_id)
{
        register uint32_t ret __asm__("r0") = arg1;
        register uint32_t r1 __asm__("r1") = arg2;
        register uint32_t r6 __asm__("r6") = call_id;
 
        compiler_barrier();
 
        __asm__ volatile(
                         "trap_s %[trap_s_id]\n"
                         : "=r"(ret)
                         : [trap_s_id] "i" (_TRAP_S_CALL_SYSTEM_CALL),
                           "r" (ret), "r" (r1), "r" (r6));
 
        return ret;
}
 
static inline uintptr_t arch_syscall_invoke1(uintptr_t arg1, uintptr_t call_id)
{
        register uint32_t ret __asm__("r0") = arg1;
        register uint32_t r6 __asm__("r6") = call_id;
 
        compiler_barrier();
 
        __asm__ volatile(
                         "trap_s %[trap_s_id]\n"
                         : "=r"(ret)
                         : [trap_s_id] "i" (_TRAP_S_CALL_SYSTEM_CALL),
                           "r" (ret), "r" (r6));
 
        return ret;
}
 
static inline uintptr_t arch_syscall_invoke0(uintptr_t call_id)
{
        register uint32_t ret __asm__("r0");
        register uint32_t r6 __asm__("r6") = call_id;
 
        compiler_barrier();
 
        __asm__ volatile(
                         "trap_s %[trap_s_id]\n"
                         : "=r"(ret)
                         : [trap_s_id] "i" (_TRAP_S_CALL_SYSTEM_CALL),
                           "r" (ret), "r" (r6));
 
        return ret;
}
 
static inline bool arch_is_user_context(void)
{
        uint32_t status;
 
        compiler_barrier();
 
        __asm__ volatile("lr %0, [%[status32]]\n"
                         : "=r"(status)
                         : [status32] "i" (_ARC_V2_STATUS32));
 
        return !(status & _ARC_V2_STATUS32_US) ? true : false;
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* _ASMLANGUAGE */
#endif /* CONFIG_USERSPACE */
#endif /* ZEPHYR_INCLUDE_ARCH_ARC_SYSCALL_H_ */