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_set_nr(struct task_struct *task, 32 struct pt_regs *regs, 33 int sysno) 34 { 35 regs->a7 = sysno; 36 } 37 38 static inline void syscall_rollback(struct task_struct *task, 39 struct pt_regs *regs) 40 { 41 regs->a0 = regs->orig_a0; 42 } 43 44 static inline long syscall_get_error(struct task_struct *task, 45 struct pt_regs *regs) 46 { 47 unsigned long error = regs->a0; 48 49 return IS_ERR_VALUE(error) ? error : 0; 50 } 51 52 static inline long syscall_get_return_value(struct task_struct *task, 53 struct pt_regs *regs) 54 { 55 return regs->a0; 56 } 57 58 static inline void syscall_set_return_value(struct task_struct *task, 59 struct pt_regs *regs, 60 int error, long val) 61 { 62 regs->a0 = (long) error ?: val; 63 } 64 65 static inline void syscall_get_arguments(struct task_struct *task, 66 struct pt_regs *regs, 67 unsigned long *args) 68 { 69 args[0] = regs->orig_a0; 70 args++; 71 memcpy(args, ®s->a1, 5 * sizeof(args[0])); 72 } 73 74 static inline void syscall_set_arguments(struct task_struct *task, 75 struct pt_regs *regs, 76 const unsigned long *args) 77 { 78 regs->orig_a0 = args[0]; 79 args++; 80 memcpy(®s->a1, args, 5 * sizeof(regs->a1)); 81 } 82 83 static inline int syscall_get_arch(struct task_struct *task) 84 { 85 #ifdef CONFIG_64BIT 86 return AUDIT_ARCH_RISCV64; 87 #else 88 return AUDIT_ARCH_RISCV32; 89 #endif 90 } 91 92 #endif /* _ASM_RISCV_SYSCALL_H */ 93