Fix TCL error in gdb.python/py-format-string.exp.

[deliverable/binutils-gdb.git] / sim / common / syscall.c

diff --git a/sim/common/syscall.c b/sim/common/syscall.c
index 04dc71e89718cf2f90ec63b8272387d68be3ecda..18128c74930c7a3ad9256fedb33ce0ea982ea60e 100644 (file)
--- a/sim/common/syscall.c
+++ b/sim/common/syscall.c
@@ -1,12 +1,12 @@
 /* Remote target system call support.
 /* Remote target system call support.

-   Copyright 1997, 1998, 2002, 2004 Free Software Foundation, Inc.
+   Copyright 1997-2020 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
    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
+   the Free Software Foundation; either version 3 of the License, or

    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,


@@ -15,8 +15,7 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    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.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

 
 /* This interface isn't intended to be specific to any particular kind
    of remote (hardware, simulator, whatever).  As such, support for it
 
 /* This interface isn't intended to be specific to any particular kind
    of remote (hardware, simulator, whatever).  As such, support for it


@@ -25,19 +24,20 @@
    supported.  */
 
 #ifdef HAVE_CONFIG_H
    supported.  */
 
 #ifdef HAVE_CONFIG_H

-#include "cconfig.h"
+#include "config.h"

 #endif
 #include "ansidecl.h"
 #include "libiberty.h"
 #endif
 #include "ansidecl.h"
 #include "libiberty.h"

-#ifdef ANSI_PROTOTYPES

 #include <stdarg.h>
 #include <stdarg.h>

-#else
-#include <varargs.h>
-#endif

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

+#ifdef HAVE_STRING_H
+#include <string.h>
+#elif defined (HAVE_STRINGS_H)
+#include <strings.h>
+#endif

 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif


@@ -68,16 +68,16 @@
 #define TWORD long
 #define TADDR unsigned long
 
 #define TWORD long
 #define TADDR unsigned long
 

+/* Path to be prepended to syscalls with absolute paths, and to be
+   chdir:ed at startup, if not empty.  */
+char *simulator_sysroot = "";
+

 /* 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.  */
 
 /* 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;
+int
+cb_get_string (host_callback *cb, CB_SYSCALL *sc, char *buf, int buflen,
+              TADDR addr)

 {
   char *p, *pend;
 
 {
   char *p, *pend;
 


@@ -88,7 +88,7 @@ get_string (cb, sc, buf, buflen, addr)
         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);
         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)
       if (count != 1)
        return EINVAL;
       if (*p == 0)


@@ -101,22 +101,36 @@ get_string (cb, sc, buf, buflen, addr)
 
 /* Utility of cb_syscall to fetch a path name.
    The buffer is malloc'd and the address is stored in BUFP.
 
 /* 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.
+   The result is that of get_string, but prepended with
+   simulator_sysroot if the string starts with '/'.

    If an error occurs, no buffer is left malloc'd.  */
 
 static int
    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;
+get_path (host_callback *cb, CB_SYSCALL *sc, TADDR addr, char **bufp)

 {
   char *buf = xmalloc (MAX_PATH_LEN);
   int result;
 {
   char *buf = xmalloc (MAX_PATH_LEN);
   int result;

+  int sysroot_len = strlen (simulator_sysroot);

 
 

-  result = get_string (cb, sc, buf, MAX_PATH_LEN, addr);
+  result = cb_get_string (cb, sc, buf, MAX_PATH_LEN - sysroot_len, addr);

   if (result == 0)
   if (result == 0)

-    *bufp = buf;
+    {
+      /* Prepend absolute paths with simulator_sysroot.  Relative paths
+        are supposed to be relative to a chdir within that path, but at
+        this point unknown where.  */
+      if (simulator_sysroot[0] != '\0' && *buf == '/')
+       {
+         /* Considering expected rareness of syscalls with absolute
+            file paths (compared to relative file paths and insn
+            execution), it does not seem worthwhile to rearrange things
+            to get rid of the string moves here; we'd need at least an
+            extra call to check the initial '/' in the path.  */
+         memmove (buf + sysroot_len, buf, sysroot_len);
+         memcpy (buf, simulator_sysroot, sysroot_len);
+       }
+
+      *bufp = buf;
+    }

   else
     free (buf);
   return result;
   else
     free (buf);
   return result;


@@ -125,9 +139,7 @@ get_path (cb, sc, addr, bufp)
 /* Perform a system call on behalf of the target.  */
 
 CB_RC
 /* Perform a system call on behalf of the target.  */
 
 CB_RC

-cb_syscall (cb, sc)
-     host_callback *cb;
-     CB_SYSCALL *sc;
+cb_syscall (host_callback *cb, CB_SYSCALL *sc)

 {
   TWORD result = 0, errcode = 0;
 
 {
   TWORD result = 0, errcode = 0;
 


@@ -228,7 +240,7 @@ cb_syscall (cb, sc)
 #endif /* wip */
 
     case CB_SYS_exit :
 #endif /* wip */
 
     case CB_SYS_exit :

-      /* Caller must catch and handle.  */
+      /* Caller must catch and handle; see sim_syscall as an example.  */

       break;
 
     case CB_SYS_open :
       break;
 
     case CB_SYS_open :


@@ -269,7 +281,7 @@ cb_syscall (cb, sc)
 
        while (count > 0)
          {
 
        while (count > 0)
          {

-           if (fd == 0)
+           if (cb_is_stdin (cb, fd))

              result = (int) (*cb->read_stdin) (cb, buf,
                                                (count < FILE_XFR_SIZE
                                                 ? count : FILE_XFR_SIZE));
              result = (int) (*cb->read_stdin) (cb, buf,
                                                (count < FILE_XFR_SIZE
                                                 ? count : FILE_XFR_SIZE));


@@ -322,12 +334,12 @@ cb_syscall (cb, sc)
                errcode = EINVAL;
                goto FinishSyscall;
              }
                errcode = EINVAL;
                goto FinishSyscall;
              }

-           if (fd == 1)
+           if (cb_is_stdout (cb, fd))

              {
                result = (int) (*cb->write_stdout) (cb, buf, bytes_read);
                (*cb->flush_stdout) (cb);
              }
              {
                result = (int) (*cb->write_stdout) (cb, buf, bytes_read);
                (*cb->flush_stdout) (cb);
              }

-           else if (fd == 2)
+           else if (cb_is_stderr (cb, fd))

              {
                result = (int) (*cb->write_stderr) (cb, buf, bytes_read);
                (*cb->flush_stderr) (cb);
              {
                result = (int) (*cb->write_stderr) (cb, buf, bytes_read);
                (*cb->flush_stderr) (cb);


@@ -373,6 +385,63 @@ cb_syscall (cb, sc)
       }
       break;
 
       }
       break;
 

+    case CB_SYS_truncate :
+      {
+       char *path;
+       long len = sc->arg2;
+
+       errcode = get_path (cb, sc, sc->arg1, &path);
+       if (errcode != 0)
+         {
+           result = -1;
+           errcode = EFAULT;
+           goto FinishSyscall;
+         }
+       result = (*cb->truncate) (cb, path, len);
+       free (path);
+       if (result < 0)
+         goto ErrorFinish;
+      }
+      break;
+
+    case CB_SYS_ftruncate :
+      {
+       int fd = sc->arg1;
+       long len = sc->arg2;
+
+       result = (*cb->ftruncate) (cb, fd, len);
+       if (result < 0)
+         goto ErrorFinish;
+      }
+      break;
+
+    case CB_SYS_rename :
+      {
+       char *path1, *path2;
+
+       errcode = get_path (cb, sc, sc->arg1, &path1);
+       if (errcode != 0)
+         {
+           result = -1;
+           errcode = EFAULT;
+           goto FinishSyscall;
+         }
+       errcode = get_path (cb, sc, sc->arg2, &path2);
+       if (errcode != 0)
+         {
+           result = -1;
+           errcode = EFAULT;
+           free (path1);
+           goto FinishSyscall;
+         }
+       result = (*cb->rename) (cb, path1, path2);
+       free (path1);
+       free (path2);
+       if (result < 0)
+         goto ErrorFinish;
+      }
+      break;
+

     case CB_SYS_stat :
       {
        char *path,*buf;
     case CB_SYS_stat :
       {
        char *path,*buf;


@@ -386,7 +455,7 @@ cb_syscall (cb, sc)
            result = -1;
            goto FinishSyscall;
          }
            result = -1;
            goto FinishSyscall;
          }

-       result = (*cb->stat) (cb, path, &statbuf);
+       result = (*cb->to_stat) (cb, path, &statbuf);

        free (path);
        if (result < 0)
          goto ErrorFinish;
        free (path);
        if (result < 0)
          goto ErrorFinish;


@@ -419,7 +488,7 @@ cb_syscall (cb, sc)
        struct stat statbuf;
        TADDR addr = sc->arg2;
 
        struct stat statbuf;
        TADDR addr = sc->arg2;
 

-       result = (*cb->fstat) (cb, sc->arg1, &statbuf);
+       result = (*cb->to_fstat) (cb, sc->arg1, &statbuf);

        if (result < 0)
          goto ErrorFinish;
        buflen = cb_host_to_target_stat (cb, NULL, NULL);
        if (result < 0)
          goto ErrorFinish;
        buflen = cb_host_to_target_stat (cb, NULL, NULL);


@@ -444,6 +513,77 @@ cb_syscall (cb, sc)
       }
       break;
 
       }
       break;
 

+    case CB_SYS_lstat :
+      {
+       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->to_lstat) (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.
+              Unfortunately, it's hard to test this case, so there's no
+              test-case for this execution path.  */
+           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_pipe :
+      {
+       int p[2];
+       char *target_p = xcalloc (1, cb->target_sizeof_int * 2);
+
+       result = (*cb->pipe) (cb, p);
+       if (result != 0)
+         goto ErrorFinish;
+
+       cb_store_target_endian (cb, target_p, cb->target_sizeof_int, p[0]);
+       cb_store_target_endian (cb, target_p + cb->target_sizeof_int,
+                               cb->target_sizeof_int, p[1]);
+       if ((*sc->write_mem) (cb, sc, sc->arg1, target_p,
+                             cb->target_sizeof_int * 2)
+           != cb->target_sizeof_int * 2)
+         {
+           /* Close the pipe fd:s.  */
+           (*cb->close) (cb, p[0]);
+           (*cb->close) (cb, p[1]);
+           errcode = EFAULT;
+           result = -1;
+         }
+
+       free (target_p);
+      }
+      break;
+

     case CB_SYS_time :
       {
        /* FIXME: May wish to change CB_SYS_time to something else.
     case CB_SYS_time :
       {
        /* FIXME: May wish to change CB_SYS_time to something else.