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syscall.h

#ifndef __ASM_MICROBLAZE_SYSCALL_H
#define __ASM_MICROBLAZE_SYSCALL_H

#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/ptrace.h>

/* The system call number is given by the user in R12 */
static inline long syscall_get_nr(struct task_struct *task,
                          struct pt_regs *regs)
{
      return regs->r12;
}

static inline void syscall_rollback(struct task_struct *task,
                            struct pt_regs *regs)
{
      /* TODO.  */
}

static inline long syscall_get_error(struct task_struct *task,
                             struct pt_regs *regs)
{
      return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0;
}

static inline long syscall_get_return_value(struct task_struct *task,
                                  struct pt_regs *regs)
{
      return regs->r3;
}

static inline void syscall_set_return_value(struct task_struct *task,
                                  struct pt_regs *regs,
                                  int error, long val)
{
      if (error)
            regs->r3 = -error;
      else
            regs->r3 = val;
}

static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs,
                                            unsigned int n)
{
      switch (n) {
      case 5: return regs->r10;
      case 4: return regs->r9;
      case 3: return regs->r8;
      case 2: return regs->r7;
      case 1: return regs->r6;
      case 0: return regs->r5;
      default:
            BUG();
      }
      return ~0;
}

static inline void microblaze_set_syscall_arg(struct pt_regs *regs,
                                    unsigned int n,
                                    unsigned long val)
{
      switch (n) {
      case 5:
            regs->r10 = val;
      case 4:
            regs->r9 = val;
      case 3:
            regs->r8 = val;
      case 2:
            regs->r7 = val;
      case 1:
            regs->r6 = val;
      case 0:
            regs->r5 = val;
      default:
            BUG();
      }
}

static inline void syscall_get_arguments(struct task_struct *task,
                               struct pt_regs *regs,
                               unsigned int i, unsigned int n,
                               unsigned long *args)
{
      while (n--)
            *args++ = microblaze_get_syscall_arg(regs, i++);
}

static inline void syscall_set_arguments(struct task_struct *task,
                               struct pt_regs *regs,
                               unsigned int i, unsigned int n,
                               const unsigned long *args)
{
      while (n--)
            microblaze_set_syscall_arg(regs, i++, *args++);
}

#endif /* __ASM_MICROBLAZE_SYSCALL_H */

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