1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved. 4 * Copyright 2010 Tilera Corporation. All Rights Reserved. 5 * Copyright 2015 Regents of the University of California, Berkeley 6 * 7 * See asm-generic/syscall.h for descriptions of what we must do here. 8 */ 9 10 #ifndef _ASM_RISCV_SYSCALL_H 11 #define _ASM_RISCV_SYSCALL_H 12 13 #include <uapi/linux/audit.h> 14 #include <linux/sched.h> 15 #include <linux/err.h> 16 17 /* The array of function pointers for syscalls. */ 18 extern void * const sys_call_table[]; 19 extern void * const compat_sys_call_table[]; 20 21 /* 22 * Only the low 32 bits of orig_r0 are meaningful, so we return int. 23 * This importantly ignores the high bits on 64-bit, so comparisons 24 * sign-extend the low 32 bits. 25 */ 26 static inline int syscall_get_nr(struct task_struct *task, 27 struct pt_regs *regs) 28 { 29 return regs->a7; 30 } 31 32 static inline void syscall_rollback(struct task_struct *task, 33 struct pt_regs *regs) 34 { 35 regs->a0 = regs->orig_a0; 36 } 37 38 static inline long syscall_get_error(struct task_struct *task, 39 struct pt_regs *regs) 40 { 41 unsigned long error = regs->a0; 42 43 return IS_ERR_VALUE(error) ? error : 0; 44 } 45 46 static inline long syscall_get_return_value(struct task_struct *task, 47 struct pt_regs *regs) 48 { 49 return regs->a0; 50 } 51 52 static inline void syscall_set_return_value(struct task_struct *task, 53 struct pt_regs *regs, 54 int error, long val) 55 { 56 regs->a0 = (long) error ?: val; 57 } 58 59 static inline void syscall_get_arguments(struct task_struct *task, 60 struct pt_regs *regs, 61 unsigned long *args) 62 { 63 args[0] = regs->orig_a0; 64 args++; 65 memcpy(args, ®s->a1, 5 * sizeof(args[0])); 66 } 67 68 static inline int syscall_get_arch(struct task_struct *task) 69 { 70 #ifdef CONFIG_64BIT 71 return AUDIT_ARCH_RISCV64; 72 #else 73 return AUDIT_ARCH_RISCV32; 74 #endif 75 } 76 77 asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t); 78 #endif /* _ASM_RISCV_SYSCALL_H */ 79