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syscall.h

#ifndef __ASM_SPARC_SYSCALL_H
#define __ASM_SPARC_SYSCALL_H

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

/* The system call number is given by the user in %g1 */
static inline long syscall_get_nr(struct task_struct *task,
                          struct pt_regs *regs)
{
      int syscall_p = pt_regs_is_syscall(regs);

      return (syscall_p ? regs->u_regs[UREG_G1] : -1L);
}

static inline void syscall_rollback(struct task_struct *task,
                            struct pt_regs *regs)
{
      /* XXX This needs some thought.  On Sparc we don't
       * XXX save away the original %o0 value somewhere.
       * XXX Instead we hold it in register %l5 at the top
       * XXX level trap frame and pass this down to the signal
       * XXX dispatch code which is the only place that value
       * XXX ever was needed.
       */
}

#ifdef CONFIG_SPARC32
static inline bool syscall_has_error(struct pt_regs *regs)
{
      return (regs->psr & PSR_C) ? true : false;
}
static inline void syscall_set_error(struct pt_regs *regs)
{
      regs->psr |= PSR_C;
}
static inline void syscall_clear_error(struct pt_regs *regs)
{
      regs->psr &= ~PSR_C;
}
#else
static inline bool syscall_has_error(struct pt_regs *regs)
{
      return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
}
static inline void syscall_set_error(struct pt_regs *regs)
{
      regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
}
static inline void syscall_clear_error(struct pt_regs *regs)
{
      regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
}
#endif

static inline long syscall_get_error(struct task_struct *task,
                             struct pt_regs *regs)
{
      long val = regs->u_regs[UREG_I0];

      return (syscall_has_error(regs) ? -val : 0);
}

static inline long syscall_get_return_value(struct task_struct *task,
                                  struct pt_regs *regs)
{
      long val = regs->u_regs[UREG_I0];

      return val;
}

static inline void syscall_set_return_value(struct task_struct *task,
                                  struct pt_regs *regs,
                                  int error, long val)
{
      if (error) {
            syscall_set_error(regs);
            regs->u_regs[UREG_I0] = -error;
      } else {
            syscall_clear_error(regs);
            regs->u_regs[UREG_I0] = val;
      }
}

static inline void syscall_get_arguments(struct task_struct *task,
                               struct pt_regs *regs,
                               unsigned int i, unsigned int n,
                               unsigned long *args)
{
      int zero_extend = 0;
      unsigned int j;

#ifdef CONFIG_SPARC64
      if (test_tsk_thread_flag(task, TIF_32BIT))
            zero_extend = 1;
#endif

      for (j = 0; j < n; j++) {
            unsigned long val = regs->u_regs[UREG_I0 + i + j];

            if (zero_extend)
                  args[j] = (u32) val;
            else
                  args[j] = val;
      }
}

static inline void syscall_set_arguments(struct task_struct *task,
                               struct pt_regs *regs,
                               unsigned int i, unsigned int n,
                               const unsigned long *args)
{
      unsigned int j;

      for (j = 0; j < n; j++)
            regs->u_regs[UREG_I0 + i + j] = args[j];
}

#endif /* __ASM_SPARC_SYSCALL_H */

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