emul_unix.c

这个是LINUX下的GDB调度工具的源码

/*  This file is part of the program psim.

    Copyright (C) 1996-1998, Andrew Cagney <[e-mail]>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

    */


#ifndef _EMUL_UNIX_C_
#define _EMUL_UNIX_C_


/* Note: this module is called via a table.  There is no benefit in
   making it inline */

#include "emul_generic.h"
#include "emul_unix.h"

#ifdef HAVE_STRING_H
#include <string.h>
#else
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#endif

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#ifdef HAVE_SYS_TYPES_H
#include <sys/stat.h>
#else
#undef HAVE_STAT
#undef HAVE_LSTAT
#undef HAVE_FSTAT
#endif

#include <stdio.h>
#include <signal.h>
#include <errno.h>

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif

#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif

#ifndef HAVE_TERMIOS_STRUCTURE
#undef HAVE_SYS_TERMIOS_H
#undef HAVE_TCGETATTR
#else
#ifndef HAVE_SYS_TERMIOS_H
#undef HAVE_TERMIOS_STRUCTURE
#endif
#endif

#ifdef HAVE_TERMIOS_STRUCTURE
#include <sys/termios.h>

/* If we have TERMIOS, use that for the termio structure, since some systems
   don't like including both sys/termios.h and sys/termio.h at the same
   time.  */
#undef	HAVE_TERMIO_STRUCTURE
#undef	TCGETA
#undef	termio
#define termio termios
#endif

#ifndef HAVE_TERMIO_STRUCTURE
#undef HAVE_SYS_TERMIO_H
#else
#ifndef HAVE_SYS_TERMIO_H
#undef HAVE_TERMIO_STRUCTURE
#endif
#endif

#ifdef HAVE_TERMIO_STRUCTURE
#include <sys/termio.h>
#endif

#ifdef HAVE_GETRUSAGE
#ifndef HAVE_SYS_RESOURCE_H
#undef HAVE_GETRUSAGE
#endif
#endif

#ifdef HAVE_GETRUSAGE
#include <sys/resource.h>
int getrusage();
#endif

#if HAVE_DIRENT_H
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# if HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif
# if HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif
# if HAVE_NDIR_H
#  include <ndir.h>
# endif
#endif

#ifdef HAVE_UNISTD_H
#undef MAXPATHLEN		/* sys/param.h might define this also */
#include <unistd.h>
#endif

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

#if defined(BSD) && !defined(errno) && (BSD < 199306)	/* here BSD as just a bug */
extern int errno;
#endif

#ifndef STATIC_INLINE_EMUL_UNIX
#define STATIC_INLINE_EMUL_UNIX STATIC_INLINE
#endif

#ifndef PATH_MAX
#define PATH_MAX 1024
#endif

#ifndef EINVAL
#define EINVAL -1
#endif

/* UNIX's idea of what is needed to implement emulations */

struct _os_emul_data {
  device *vm;
  emul_syscall *syscalls;
};


/* Emulation of simple UNIX system calls that are common on all systems.  */

/* Structures that are common agmonst the UNIX varients */
struct unix_timeval {
  signed32 tv_sec;		/* seconds */
  signed32 tv_usec;		/* microseconds */
};

struct unix_timezone {
  signed32 tz_minuteswest;	/* minutes west of Greenwich */
  signed32 tz_dsttime;		/* type of dst correction */
};

#define	UNIX_RUSAGE_SELF	0
#define	UNIX_RUSAGE_CHILDREN	(-1)
#define UNIX_RUSAGE_BOTH	(-2)	/* sys_wait4() uses this */

struct	unix_rusage {
	struct unix_timeval ru_utime;	/* user time used */
	struct unix_timeval ru_stime;	/* system time used */
	signed32 ru_maxrss;		/* maximum resident set size */
	signed32 ru_ixrss;		/* integral shared memory size */
	signed32 ru_idrss;		/* integral unshared data size */
	signed32 ru_isrss;		/* integral unshared stack size */
	signed32 ru_minflt;		/* any page faults not requiring I/O */
	signed32 ru_majflt;		/* any page faults requiring I/O */
	signed32 ru_nswap;		/* swaps */
	signed32 ru_inblock;		/* block input operations */
	signed32 ru_oublock;		/* block output operations */
	signed32 ru_msgsnd;		/* messages sent */
	signed32 ru_msgrcv;		/* messages received */
	signed32 ru_nsignals;		/* signals received */
	signed32 ru_nvcsw;		/* voluntary context switches */
	signed32 ru_nivcsw;		/* involuntary " */
};


static void
do_unix_exit(os_emul_data *emul,
	     unsigned call,
	     const int arg0,
	     cpu *processor,
	     unsigned_word cia)
{
  int status = (int)cpu_registers(processor)->gpr[arg0];
  if (WITH_TRACE && ppc_trace[trace_os_emul])
    printf_filtered ("%d)\n", status);

  cpu_halt(processor, cia, was_exited, status);
}


static void
do_unix_read(os_emul_data *emul,
	     unsigned call,
	     const int arg0,
	     cpu *processor,
	     unsigned_word cia)
{
  void *scratch_buffer;
  int d = (int)cpu_registers(processor)->gpr[arg0];
  unsigned_word buf = cpu_registers(processor)->gpr[arg0+1];
  int nbytes = cpu_registers(processor)->gpr[arg0+2];
  int status;

  if (WITH_TRACE && ppc_trace[trace_os_emul])
    printf_filtered ("%d, 0x%lx, %d", d, (long)buf, nbytes);

  /* get a tempoary bufer */
  scratch_buffer = zalloc(nbytes);

  /* check if buffer exists by reading it */
  emul_read_buffer(scratch_buffer, buf, nbytes, processor, cia);

  /* read */
  status = read (d, scratch_buffer, nbytes);

  emul_write_status(processor, status, errno);
  if (status > 0)
    emul_write_buffer(scratch_buffer, buf, status, processor, cia);

  zfree(scratch_buffer);
}


static void
do_unix_write(os_emul_data *emul,
	      unsigned call,
	      const int arg0,
	      cpu *processor,
	      unsigned_word cia)
{
  void *scratch_buffer = NULL;
  int d = (int)cpu_registers(processor)->gpr[arg0];
  unsigned_word buf = cpu_registers(processor)->gpr[arg0+1];
  int nbytes = cpu_registers(processor)->gpr[arg0+2];
  int status;

  if (WITH_TRACE && ppc_trace[trace_os_emul])
    printf_filtered ("%d, 0x%lx, %d", d, (long)buf, nbytes);

  /* get a tempoary bufer */
  scratch_buffer = zalloc(nbytes); /* FIXME - nbytes == 0 */

  /* copy in */
  emul_read_buffer(scratch_buffer, buf, nbytes,
		   processor, cia);

  /* write */
  status = write(d, scratch_buffer, nbytes);
  emul_write_status(processor, status, errno);
  zfree(scratch_buffer);

  flush_stdoutput();
}


static void
do_unix_open(os_emul_data *emul,
	     unsigned call,
	     const int arg0,
	     cpu *processor,
	     unsigned_word cia)
{
  unsigned_word path_addr = cpu_registers(processor)->gpr[arg0];
  char path_buf[PATH_MAX];
  char *path = emul_read_string(path_buf, path_addr, PATH_MAX, processor, cia);
  int flags = (int)cpu_registers(processor)->gpr[arg0+1];
  int mode = (int)cpu_registers(processor)->gpr[arg0+2];
  int status;

  if (WITH_TRACE && ppc_trace[trace_os_emul])
    printf_filtered ("0x%lx [%s], 0x%x, 0x%x", (long)path_addr, path, flags, mode);

  status = open(path, flags, mode);
  emul_write_status(processor, status, errno);
}


static void
do_unix_close(os_emul_data *emul,
	      unsigned call,
	      const int arg0,
	      cpu *processor,
	      unsigned_word cia)
{
  int d = (int)cpu_registers(processor)->gpr[arg0];
  int status;

  if (WITH_TRACE && ppc_trace[trace_os_emul])
    printf_filtered ("%d", d);

  status = close(d);
  emul_write_status(processor, status, errno);
}


static void
do_unix_break(os_emul_data *emul,
	      unsigned call,
	      const int arg0,
	      cpu *processor,
	      unsigned_word cia)
{
  /* just pass this onto the `vm' device */
  unsigned_word new_break = cpu_registers(processor)->gpr[arg0];
  int status;

  if (WITH_TRACE && ppc_trace[trace_os_emul])
    printf_filtered ("0x%lx", (long)cpu_registers(processor)->gpr[arg0]);

  status = device_ioctl(emul->vm,
			processor,
			cia,
			device_ioctl_break,
			new_break); /*ioctl-data*/

  emul_write_status(processor, 0, status);
}

#ifndef HAVE_ACCESS
#define do_unix_access 0
#else
static void
do_unix_access(os_emul_data *emul,
	       unsigned call,
	       const int arg0,
	       cpu *processor,
	       unsigned_word cia)
{
  unsigned_word path_addr = cpu_registers(processor)->gpr[arg0];
  char path_buf[PATH_MAX];
  char *path = emul_read_string(path_buf, path_addr, PATH_MAX, processor, cia);
  int mode = (int)cpu_registers(processor)->gpr[arg0+1];
  int status;

  if (WITH_TRACE && ppc_trace[trace_os_emul])
    printf_filtered ("0x%lx [%s], 0x%x [0%o]", (long)path_addr, path, mode, mode);

  status = access(path, mode);
  emul_write_status(processor, status, errno);
}
#endif

#ifndef HAVE_GETPID
#define do_unix_getpid 0
#else
static void
do_unix_getpid(os_emul_data *emul,
	       unsigned call,
	       const int arg0,
	       cpu *processor,
	       unsigned_word cia)
{
  pid_t status = getpid();
  emul_write_status(processor, (int)status, errno);
}
#endif

#ifndef HAVE_GETPPID
#define do_unix_getppid 0
#else
static void
do_unix_getppid(os_emul_data *emul,
		unsigned call,
		const int arg0,
		cpu *processor,
		unsigned_word cia)
{
  pid_t status = getppid();
  emul_write_status(processor, (int)status, errno);
}
#endif

#if !defined(HAVE_GETPID) || !defined(HAVE_GETPPID)
#define do_unix_getpid2 0
#else
static void
do_unix_getpid2(os_emul_data *emul,
		unsigned call,
		const int arg0,
		cpu *processor,
		unsigned_word cia)
{
  int pid  = (int)getpid();
  int ppid = (int)getppid();
  emul_write2_status(processor, pid, ppid, errno);
}
#endif

#if !defined(HAVE_GETUID) || !defined(HAVE_GETEUID)
#define do_unix_getuid2 0
#else
static void
do_unix_getuid2(os_emul_data *emul,
		unsigned call,
		const int arg0,
		cpu *processor,
		unsigned_word cia)
{
  uid_t uid  = getuid();
  uid_t euid = geteuid();
  emul_write2_status(processor, (int)uid, (int)euid, errno);
}
#endif

#ifndef HAVE_GETUID
#define do_unix_getuid 0
#else
static void
do_unix_getuid(os_emul_data *emul,
	       unsigned call,
	       const int arg0,
	       cpu *processor,
	       unsigned_word cia)
{
  uid_t status = getuid();
  emul_write_status(processor, (int)status, errno);
}
#endif

#ifndef HAVE_GETEUID
#define do_unix_geteuid 0
#else
static void
do_unix_geteuid(os_emul_data *emul,
		unsigned call,
		const int arg0,
		cpu *processor,
		unsigned_word cia)
{
  uid_t status = geteuid();
  emul_write_status(processor, (int)status, errno);
}
#endif

#if 0
#ifndef HAVE_KILL
#define do_unix_kill 0
#else
static void
do_unix_kill(os_emul_data *emul,
	     unsigned call,
	     const int arg0,
	     cpu *processor,
	     unsigned_word cia)
{
  pid_t pid = cpu_registers(processor)->gpr[arg0];
  int sig = cpu_registers(processor)->gpr[arg0+1];

  if (WITH_TRACE && ppc_trace[trace_os_emul])
    printf_filtered ("%d, %d", (int)pid, sig);

  printf_filtered("SYS_kill at 0x%lx - more to this than just being killed\n",
		  (long)cia);

  cpu_halt(processor, cia, was_signalled, sig);
}
#endif
#endif

#ifndef HAVE_DUP
#define do_unix_dup 0
#else
static void
do_unix_dup(os_emul_data *emul,
	    unsigned call,
	    const int arg0,
	    cpu *processor,
	    unsigned_word cia)
{
  int oldd = cpu_registers(processor)->gpr[arg0];
  int status = dup(oldd);
  int err = errno;

  if (WITH_TRACE && ppc_trace[trace_os_emul])
    printf_filtered ("%d", oldd);

  emul_write_status(processor, status, err);
}
#endif

#ifndef HAVE_DUP2
#define do_unix_dup2 0
#else