Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 482 insertions, 0 deletions

diff --git a/sim/common/syscall.c b/sim/common/syscall.c
new file mode 100644
index 0000000..e0a3b88
--- /dev/null
+++ b/sim/common/syscall.c
@@ -0,0 +1,482 @@
+/* Remote target system call support.
+   Copyright 1997, 1998 Free Software Foundation, Inc.
+   Contributed by Cygnus Solutions.
+
+   This file is part of GDB.
+
+   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 GAS; see the file COPYING.  If not, write to the Free Software
+   Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* This interface isn't intended to be specific to any particular kind
+   of remote (hardware, simulator, whatever).  As such, support for it
+   (e.g. sim/common/callback.c) should *not* live in the simulator source
+   tree, nor should it live in the gdb source tree.  K&R C must be
+   supported.  */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include "ansidecl.h"
+#include "libiberty.h"
+#ifdef ANSI_PROTOTYPES
+#include <stdarg.h>
+#else
+#include <varargs.h>
+#endif
+#include <stdio.h>
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <errno.h>
+#include <fcntl.h>
+#include <time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "callback.h"
+#include "targ-vals.h"
+
+#ifndef ENOSYS
+#define ENOSYS EINVAL
+#endif
+#ifndef ENAMETOOLONG
+#define ENAMETOOLONG EINVAL
+#endif
+
+/* Maximum length of a path name.  */
+#ifndef MAX_PATH_LEN
+#define MAX_PATH_LEN 1024
+#endif
+
+/* When doing file read/writes, do this many bytes at a time.  */
+#define FILE_XFR_SIZE 4096
+
+/* FIXME: for now, need to consider target word size.  */
+#define TWORD long
+#define TADDR unsigned long
+
+/* Utility of cb_syscall to fetch a path name or other string from the target.
+   The result is 0 for success or a host errno value.  */
+
+static int
+get_string (cb, sc, buf, buflen, addr)
+     host_callback *cb;
+     CB_SYSCALL *sc;
+     char *buf;
+     int buflen;
+     TADDR addr;
+{
+  char *p, *pend;
+
+  for (p = buf, pend = buf + buflen; p < pend; ++p, ++addr)
+    {
+      /* No, it isn't expected that this would cause one transaction with
+	 the remote target for each byte.  The target could send the
+	 path name along with the syscall request, and cache the file
+	 name somewhere (or otherwise tweak this as desired).  */
+      unsigned int count = (*sc->read_mem) (cb, sc, addr, p, 1);
+				    
+      if (count != 1)
+	return EINVAL;
+      if (*p == 0)
+	break;
+    }
+  if (p == pend)
+    return ENAMETOOLONG;
+  return 0;
+}
+
+/* Utility of cb_syscall to fetch a path name.
+   The buffer is malloc'd and the address is stored in BUFP.
+   The result is that of get_string.
+   If an error occurs, no buffer is left malloc'd.  */
+
+static int
+get_path (cb, sc, addr, bufp)
+     host_callback *cb;
+     CB_SYSCALL *sc;
+     TADDR addr;
+     char **bufp;
+{
+  char *buf = xmalloc (MAX_PATH_LEN);
+  int result;
+
+  result = get_string (cb, sc, buf, MAX_PATH_LEN, addr);
+  if (result == 0)
+    *bufp = buf;
+  else
+    free (buf);
+  return result;
+}
+
+/* Perform a system call on behalf of the target.  */
+
+CB_RC
+cb_syscall (cb, sc)
+     host_callback *cb;
+     CB_SYSCALL *sc;
+{
+  TWORD result = 0, errcode = 0;
+
+  if (sc->magic != CB_SYSCALL_MAGIC)
+    abort ();
+
+  switch (cb_target_to_host_syscall (cb, sc->func))
+    {
+#if 0 /* FIXME: wip */
+    case CB_SYS_argvlen :
+      {
+	/* Compute how much space is required to store the argv,envp
+	   strings so that the program can allocate the space and then
+	   call SYS_argv to fetch the values.  */
+	int addr_size = cb->addr_size;
+	int argc,envc,arglen,envlen;
+	const char **argv = cb->init_argv;
+	const char **envp = cb->init_envp;
+
+	argc = arglen = 0;
+	if (argv)
+	  {
+	    for ( ; argv[argc]; ++argc)
+	      arglen += strlen (argv[argc]) + 1;
+	  }
+	envc = envlen = 0;
+	if (envp)
+	  {
+	    for ( ; envp[envc]; ++envc)
+	      envlen += strlen (envp[envc]) + 1;
+	  }
+	result = arglen + envlen;
+	break;
+      }
+
+    case CB_SYS_argv :
+      {
+	/* Pointer to target's buffer.  */
+	TADDR tbuf = sc->arg1;
+	/* Buffer size.  */
+	int bufsize = sc->arg2;
+	/* Q is the target address of where all the strings go.  */
+	TADDR q;
+	int word_size = cb->word_size;
+	int i,argc,envc,len;
+	const char **argv = cb->init_argv;
+	const char **envp = cb->init_envp;
+
+	argc = 0;
+	if (argv)
+	  {
+	    for ( ; argv[argc]; ++argc)
+	      {
+		int len = strlen (argv[argc]);
+		int written = (*sc->write_mem) (cb, sc, tbuf, argv[argc], len + 1);
+		if (written != len)
+		  {
+		    result = -1;
+		    errcode = EINVAL;
+		    goto FinishSyscall;
+		  }
+		tbuf = len + 1;
+	      }
+	  }
+	if ((*sc->write_mem) (cb, sc, tbuf, "", 1) != 1)
+	  {
+	    result = -1;
+	    errcode = EINVAL;
+	    goto FinishSyscall;
+	  }
+	tbuf++;
+	envc = 0;
+	if (envp)
+	  {
+	    for ( ; envp[envc]; ++envc)
+	      {
+		int len = strlen (envp[envc]);
+		int written = (*sc->write_mem) (cb, sc, tbuf, envp[envc], len + 1);
+		if (written != len)
+		  {
+		    result = -1;
+		    errcode = EINVAL;
+		    goto FinishSyscall;
+		  }
+		tbuf = len + 1;
+	      }
+	  }
+	if ((*sc->write_mem) (cb, sc, tbuf, "", 1) != 1)
+	  {
+	    result = -1;
+	    errcode = EINVAL;
+	    goto FinishSyscall;
+	  }
+	result = argc;
+	sc->result2 = envc;
+	break;
+      }
+#endif /* wip */
+
+    case CB_SYS_exit :
+      /* Caller must catch and handle.  */
+      break;
+
+    case CB_SYS_open :
+      {
+	char *path;
+
+	errcode = get_path (cb, sc, sc->arg1, &path);
+	if (errcode != 0)
+	  {
+	    result = -1;
+	    goto FinishSyscall;
+	  }
+	result = (*cb->open) (cb, path, sc->arg2 /*, sc->arg3*/);
+	free (path);
+	if (result < 0)
+	  goto ErrorFinish;
+      }
+      break;
+
+    case CB_SYS_close :
+      result = (*cb->close) (cb, sc->arg1);
+      if (result < 0)
+	goto ErrorFinish;
+      break;
+
+    case CB_SYS_read :
+      {
+	/* ??? Perfect handling of error conditions may require only one
+	   call to cb->read.  One can't assume all the data is
+	   contiguously stored in host memory so that would require
+	   malloc'ing/free'ing the space.  Maybe later.  */
+	char buf[FILE_XFR_SIZE];
+	int fd = sc->arg1;
+	TADDR addr = sc->arg2;
+	size_t count = sc->arg3;
+	size_t bytes_read = 0;
+	int bytes_written;
+
+	while (count > 0)
+	  {
+	    if (fd == 0)
+	      result = (int) (*cb->read_stdin) (cb, buf,
+						(count < FILE_XFR_SIZE
+						 ? count : FILE_XFR_SIZE));
+	    else
+	      result = (int) (*cb->read) (cb, fd, buf,
+					  (count < FILE_XFR_SIZE
+					   ? count : FILE_XFR_SIZE));
+	    if (result == -1)
+	      goto ErrorFinish;
+	    if (result == 0)	/* EOF */
+	      break;
+	    bytes_written = (*sc->write_mem) (cb, sc, addr, buf, result);
+	    if (bytes_written != result)
+	      {
+		result = -1;
+		errcode = EINVAL;
+		goto FinishSyscall;
+	      }
+	    bytes_read += result;
+	    count -= result;
+	    addr += result;
+	    /* If this is a short read, don't go back for more */
+	    if (result != FILE_XFR_SIZE)
+	      break;
+	  }
+	result = bytes_read;
+      }
+      break;
+
+    case CB_SYS_write :
+      {
+	/* ??? Perfect handling of error conditions may require only one
+	   call to cb->write.  One can't assume all the data is
+	   contiguously stored in host memory so that would require
+	   malloc'ing/free'ing the space.  Maybe later.  */
+	char buf[FILE_XFR_SIZE];
+	int fd = sc->arg1;
+	TADDR addr = sc->arg2;
+	size_t count = sc->arg3;
+	int bytes_read;
+	size_t bytes_written = 0;
+
+	while (count > 0)
+	  {
+	    int bytes_to_read = count < FILE_XFR_SIZE ? count : FILE_XFR_SIZE;
+	    bytes_read = (*sc->read_mem) (cb, sc, addr, buf, bytes_to_read);
+	    if (bytes_read != bytes_to_read)
+	      {
+		result = -1;
+		errcode = EINVAL;
+		goto FinishSyscall;
+	      }
+	    if (fd == 1)
+	      {
+		result = (int) (*cb->write_stdout) (cb, buf, bytes_read);
+		(*cb->flush_stdout) (cb);
+	      }
+	    else if (fd == 2)
+	      {
+		result = (int) (*cb->write_stderr) (cb, buf, bytes_read);
+		(*cb->flush_stderr) (cb);
+	      }
+	    else
+	      result = (int) (*cb->write) (cb, fd, buf, bytes_read);
+	    if (result == -1)
+	      goto ErrorFinish;
+	    bytes_written += result;
+	    count -= result;
+	    addr += result;
+	  }
+	result = bytes_written;
+      }
+      break;
+
+    case CB_SYS_lseek :
+      {
+	int fd = sc->arg1;
+	unsigned long offset = sc->arg2;
+	int whence = sc->arg3;
+
+	result = (*cb->lseek) (cb, fd, offset, whence);
+	if (result < 0)
+	  goto ErrorFinish;
+      }
+      break;
+
+    case CB_SYS_unlink :
+      {
+	char *path;
+
+	errcode = get_path (cb, sc, sc->arg1, &path);
+	if (errcode != 0)
+	  {
+	    result = -1;
+	    goto FinishSyscall;
+	  }
+	result = (*cb->unlink) (cb, path);
+	free (path);
+	if (result < 0)
+	  goto ErrorFinish;
+      }
+      break;
+
+    case CB_SYS_stat :
+      {
+	char *path,*buf;
+	int buflen;
+	struct stat statbuf;
+	TADDR addr = sc->arg2;
+
+	errcode = get_path (cb, sc, sc->arg1, &path);
+	if (errcode != 0)
+	  {
+	    result = -1;
+	    goto FinishSyscall;
+	  }
+	result = (*cb->stat) (cb, path, &statbuf);
+	free (path);
+	if (result < 0)
+	  goto ErrorFinish;
+	buflen = cb_host_to_target_stat (cb, NULL, NULL);
+	buf = xmalloc (buflen);
+	if (cb_host_to_target_stat (cb, &statbuf, buf) != buflen)
+	  {
+	    /* The translation failed.  This is due to an internal
+	       host program error, not the target's fault.  */
+	    free (buf);
+	    errcode = ENOSYS;
+	    result = -1;
+	    goto FinishSyscall;
+	  }
+	if ((*sc->write_mem) (cb, sc, addr, buf, buflen) != buflen)
+	  {
+	    free (buf);
+	    errcode = EINVAL;
+	    result = -1;
+	    goto FinishSyscall;
+	  }
+	free (buf);
+      }
+      break;
+
+    case CB_SYS_fstat :
+      {
+	char *buf;
+	int buflen;
+	struct stat statbuf;
+	TADDR addr = sc->arg2;
+
+	result = (*cb->fstat) (cb, sc->arg1, &statbuf);
+	if (result < 0)
+	  goto ErrorFinish;
+	buflen = cb_host_to_target_stat (cb, NULL, NULL);
+	buf = xmalloc (buflen);
+	if (cb_host_to_target_stat (cb, &statbuf, buf) != buflen)
+	  {
+	    /* The translation failed.  This is due to an internal
+	       host program error, not the target's fault.  */
+	    free (buf);
+	    errcode = ENOSYS;
+	    result = -1;
+	    goto FinishSyscall;
+	  }
+	if ((*sc->write_mem) (cb, sc, addr, buf, buflen) != buflen)
+	  {
+	    free (buf);
+	    errcode = EINVAL;
+	    result = -1;
+	    goto FinishSyscall;
+	  }
+	free (buf);
+      }
+      break;
+
+    case CB_SYS_time :
+      {
+	/* FIXME: May wish to change CB_SYS_time to something else.
+	   We might also want gettimeofday or times, but if system calls
+	   can be built on others, we can keep the number we have to support
+	   here down.  */
+	time_t t = (*cb->time) (cb, (time_t *) 0);
+	result = t;
+	/* It is up to target code to process the argument to time().  */
+      }
+      break;
+
+    case CB_SYS_chdir :
+    case CB_SYS_chmod :
+    case CB_SYS_utime :
+      /* fall through for now */
+
+    default :
+      result = -1;
+      errcode = ENOSYS;
+      break;
+    }
+
+ FinishSyscall:
+  sc->result = result;
+  if (errcode == 0)
+    sc->errcode = 0;
+  else
+    sc->errcode = cb_host_to_target_errno (cb, errcode);
+  return CB_RC_OK;
+
+ ErrorFinish:
+  sc->result = result;
+  sc->errcode = (*cb->get_errno) (cb);
+  return CB_RC_OK;
+}