// SPDX-License-Identifier: GPL-2.0

  /*
   * Copyright (C) 2004 PathScale, Inc

   * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)

   */
  
  #include <errno.h>
  #include <string.h>
  #include <sys/ptrace.h>

  #include <sysdep/ptrace.h>
  #include <sysdep/ptrace_user.h>
  #include <registers.h>

  int save_registers(int pid, struct uml_pt_regs *regs)

  {
  	int err;

  	err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp);

  	if (err < 0)

  		return -errno;
  	return 0;

  }

  int restore_registers(int pid, struct uml_pt_regs *regs)

  {
  	int err;

  	err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp);

  	if (err < 0)

  		return -errno;
  	return 0;

  }

  /* This is set once at boot time and not changed thereafter */
  
  static unsigned long exec_regs[MAX_REG_NR];

  static unsigned long exec_fp_regs[FP_SIZE];

  int init_registers(int pid)

  {
  	int err;
  
  	err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);

  	if (err < 0)
  		return -errno;

  
  	arch_init_registers(pid);

  	get_fp_registers(pid, exec_fp_regs);

  	return 0;

  }

  void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)

  {
  	memcpy(regs, exec_regs, sizeof(exec_regs));

  
  	if (fp_regs)
  		memcpy(fp_regs, exec_fp_regs, sizeof(exec_fp_regs));

  }