arch/c6x/include/asm/syscall.h

   1 /*
   2  * Copyright (C) 2011 Texas Instruments Incorporated
   3  * Author: Mark Salter <msalter@redhat.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #ifndef __ASM_C6X_SYSCALL_H
  12 #define __ASM_C6X_SYSCALL_H
  13
  14 #include <uapi/linux/audit.h>
  15 #include <linux/err.h>
  16 #include <linux/sched.h>
  17
  18 static inline int syscall_get_nr(struct task_struct *task,
  19                                  struct pt_regs *regs)
  20 {
  21         return regs->b0;
  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         return IS_ERR_VALUE(regs->a4) ? regs->a4 : 0;
  34 }
  35
  36 static inline long syscall_get_return_value(struct task_struct *task,
  37                                             struct pt_regs *regs)
  38 {
  39         return regs->a4;
  40 }
  41
  42 static inline void syscall_set_return_value(struct task_struct *task,
  43                                             struct pt_regs *regs,
  44                                             int error, long val)
  45 {
  46         regs->a4 = error ?: val;
  47 }
  48
  49 static inline void syscall_get_arguments(struct task_struct *task,
  50                                          struct pt_regs *regs,
  51                                          unsigned long *args)
  52 {
  53         *args++ = regs->a4;
  54         *args++ = regs->b4;
  55         *args++ = regs->a6;
  56         *args++ = regs->b6;
  57         *args++ = regs->a8;
  58         *args   = regs->b8;
  59 }
  60
  61 static inline void syscall_set_arguments(struct task_struct *task,
  62                                          struct pt_regs *regs,
  63                                          const unsigned long *args)
  64 {
  65         regs->a4 = *args++;
  66         regs->b4 = *args++;
  67         regs->a6 = *args++;
  68         regs->b6 = *args++;
  69         regs->a8 = *args++;
  70         regs->a9 = *args;
  71 }
  72
  73 static inline int syscall_get_arch(struct task_struct *task)
  74 {
  75         return IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
  76                 ? AUDIT_ARCH_C6XBE : AUDIT_ARCH_C6X;
  77 }
  78
  79 #endif /* __ASM_C6X_SYSCALLS_H */