arch/um/include/asm/syscall-generic.h

   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 = &regs->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 static inline void syscall_set_arguments(struct task_struct *task,
  66                                          struct pt_regs *regs,
  67                                          const unsigned long *args)
  68 {
  69         struct uml_pt_regs *r = &regs->regs;
  70
  71         UPT_SYSCALL_ARG1(r) = *args++;
  72         UPT_SYSCALL_ARG2(r) = *args++;
  73         UPT_SYSCALL_ARG3(r) = *args++;
  74         UPT_SYSCALL_ARG4(r) = *args++;
  75         UPT_SYSCALL_ARG5(r) = *args++;
  76         UPT_SYSCALL_ARG6(r) = *args;
  77 }
  78
  79 /* See arch/x86/um/asm/syscall.h for syscall_get_arch() definition. */
  80
  81 #endif  /* __UM_SYSCALL_GENERIC_H */