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, unsigned int i,
  51                                          unsigned int n, unsigned long *args)
  52 {
  53         switch (i) {
  54         case 0:
  55                 if (!n--)
  56                         break;
  57                 *args++ = regs->a4;
  58         case 1:
  59                 if (!n--)
  60                         break;
  61                 *args++ = regs->b4;
  62         case 2:
  63                 if (!n--)
  64                         break;
  65                 *args++ = regs->a6;
  66         case 3:
  67                 if (!n--)
  68                         break;
  69                 *args++ = regs->b6;
  70         case 4:
  71                 if (!n--)
  72                         break;
  73                 *args++ = regs->a8;
  74         case 5:
  75                 if (!n--)
  76                         break;
  77                 *args++ = regs->b8;
  78         case 6:
  79                 if (!n--)
  80                         break;
  81         default:
  82                 BUG();
  83         }
  84 }
  85
  86 static inline void syscall_set_arguments(struct task_struct *task,
  87                                          struct pt_regs *regs,
  88                                          unsigned int i, unsigned int n,
  89                                          const unsigned long *args)
  90 {
  91         switch (i) {
  92         case 0:
  93                 if (!n--)
  94                         break;
  95                 regs->a4 = *args++;
  96         case 1:
  97                 if (!n--)
  98                         break;
  99                 regs->b4 = *args++;
 100         case 2:
 101                 if (!n--)
 102                         break;
 103                 regs->a6 = *args++;
 104         case 3:
 105                 if (!n--)
 106                         break;
 107                 regs->b6 = *args++;
 108         case 4:
 109                 if (!n--)
 110                         break;
 111                 regs->a8 = *args++;
 112         case 5:
 113                 if (!n--)
 114                         break;
 115                 regs->a9 = *args++;
 116         case 6:
 117                 if (!n)
 118                         break;
 119         default:
 120                 BUG();
 121         }
 122 }
 123
 124 static inline int syscall_get_arch(struct task_struct *task)
 125 {
 126         return IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
 127                 ? AUDIT_ARCH_C6XBE : AUDIT_ARCH_C6X;
 128 }
 129
 130 #endif /* __ASM_C6X_SYSCALLS_H */