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 *sys_call_table[]; 19 20 /* 21 * Only the low 32 bits of orig_r0 are meaningful, so we return int. 22 * This importantly ignores the high bits on 64-bit, so comparisons 23 * sign-extend the low 32 bits. 24 */ 25 static inline int syscall_get_nr(struct task_struct *task, 26 struct pt_regs *regs) 27 { 28 return regs->a7; 29 } 30 31 static inline void syscall_rollback(struct task_struct *task, 32 struct pt_regs *regs) 33 { 34 regs->a0 = regs->orig_a0; 35 } 36 37 static inline long syscall_get_error(struct task_struct *task, 38 struct pt_regs *regs) 39 { 40 unsigned long error = regs->a0; 41 42 return IS_ERR_VALUE(error) ? error : 0; 43 } 44 45 static inline long syscall_get_return_value(struct task_struct *task, 46 struct pt_regs *regs) 47 { 48 return regs->a0; 49 } 50 51 static inline void syscall_set_return_value(struct task_struct *task, 52 struct pt_regs *regs, 53 int error, long val) 54 { 55 regs->a0 = (long) error ?: val; 56 } 57 58 static inline void syscall_get_arguments(struct task_struct *task, 59 struct pt_regs *regs, 60 unsigned long *args) 61 { 62 args[0] = regs->orig_a0; 63 args++; 64 memcpy(args, ®s->a1, 5 * sizeof(args[0])); 65 } 66 67 static inline void syscall_set_arguments(struct task_struct *task, 68 struct pt_regs *regs, 69 const unsigned long *args) 70 { 71 regs->orig_a0 = args[0]; 72 args++; 73 memcpy(®s->a1, args, 5 * sizeof(regs->a1)); 74 } 75 76 static inline int syscall_get_arch(struct task_struct *task) 77 { 78 #ifdef CONFIG_64BIT 79 return AUDIT_ARCH_RISCV64; 80 #else 81 return AUDIT_ARCH_RISCV32; 82 #endif 83 } 84 85 #endif /* _ASM_RISCV_SYSCALL_H */ 86