1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Access to user system call parameters and results 4 * 5 * See asm-generic/syscall.h for function descriptions. 6 * 7 * Copyright (C) 2015 Mickaël Salaün <mic@digikod.net> 8 */ 9 10 #ifndef __UM_SYSCALL_GENERIC_H 11 #define __UM_SYSCALL_GENERIC_H 12 13 #include <asm/ptrace.h> 14 #include <linux/err.h> 15 #include <linux/sched.h> 16 #include <sysdep/ptrace.h> 17 18 static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) 19 { 20 21 return PT_REGS_SYSCALL_NR(regs); 22 } 23 24 static inline void syscall_rollback(struct task_struct *task, 25 struct pt_regs *regs) 26 { 27 /* do nothing */ 28 } 29 30 static inline long syscall_get_error(struct task_struct *task, 31 struct pt_regs *regs) 32 { 33 const long error = regs_return_value(regs); 34 35 return IS_ERR_VALUE(error) ? error : 0; 36 } 37 38 static inline long syscall_get_return_value(struct task_struct *task, 39 struct pt_regs *regs) 40 { 41 return regs_return_value(regs); 42 } 43 44 static inline void syscall_set_return_value(struct task_struct *task, 45 struct pt_regs *regs, 46 int error, long val) 47 { 48 PT_REGS_SET_SYSCALL_RETURN(regs, (long) error ?: val); 49 } 50 51 static inline void syscall_get_arguments(struct task_struct *task, 52 struct pt_regs *regs, 53 unsigned long *args) 54 { 55 const struct uml_pt_regs *r = ®s->regs; 56 57 *args++ = UPT_SYSCALL_ARG1(r); 58 *args++ = UPT_SYSCALL_ARG2(r); 59 *args++ = UPT_SYSCALL_ARG3(r); 60 *args++ = UPT_SYSCALL_ARG4(r); 61 *args++ = UPT_SYSCALL_ARG5(r); 62 *args = UPT_SYSCALL_ARG6(r); 63 } 64 65 /* See arch/x86/um/asm/syscall.h for syscall_get_arch() definition. */ 66 67 #endif /* __UM_SYSCALL_GENERIC_H */ 68