include/asm/syscall-generic.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  * Access to user system call parameters and results
0004  *
0005  * See asm-generic/syscall.h for function descriptions.
0006  *
0007  * Copyright (C) 2015 Mickaël Salaün <mic@digikod.net>
0008  */
0009
0010 #ifndef __UM_SYSCALL_GENERIC_H
0011 #define __UM_SYSCALL_GENERIC_H
0012
0013 #include <asm/ptrace.h>
0014 #include <linux/err.h>
0015 #include <linux/sched.h>
0016 #include <sysdep/ptrace.h>
0017
0018 static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
0019 {
0020
0021     return PT_REGS_SYSCALL_NR(regs);
0022 }
0023
0024 static inline void syscall_rollback(struct task_struct *task,
0025                     struct pt_regs *regs)
0026 {
0027     /* do nothing */
0028 }
0029
0030 static inline long syscall_get_error(struct task_struct *task,
0031                      struct pt_regs *regs)
0032 {
0033     const long error = regs_return_value(regs);
0034
0035     return IS_ERR_VALUE(error) ? error : 0;
0036 }
0037
0038 static inline long syscall_get_return_value(struct task_struct *task,
0039                         struct pt_regs *regs)
0040 {
0041     return regs_return_value(regs);
0042 }
0043
0044 static inline void syscall_set_return_value(struct task_struct *task,
0045                         struct pt_regs *regs,
0046                         int error, long val)
0047 {
0048     PT_REGS_SET_SYSCALL_RETURN(regs, (long) error ?: val);
0049 }
0050
0051 static inline void syscall_get_arguments(struct task_struct *task,
0052                      struct pt_regs *regs,
0053                      unsigned long *args)
0054 {
0055     const struct uml_pt_regs *r = &regs->regs;
0056
0057     *args++ = UPT_SYSCALL_ARG1(r);
0058     *args++ = UPT_SYSCALL_ARG2(r);
0059     *args++ = UPT_SYSCALL_ARG3(r);
0060     *args++ = UPT_SYSCALL_ARG4(r);
0061     *args++ = UPT_SYSCALL_ARG5(r);
0062     *args   = UPT_SYSCALL_ARG6(r);
0063 }
0064
0065 /* See arch/x86/um/asm/syscall.h for syscall_get_arch() definition. */
0066
0067 #endif  /* __UM_SYSCALL_GENERIC_H */