[PATCH 1/4] SPU add *dir functions

[Patrick Mansfield <patmans at us dot ibm dot com>]

Add SPU support for opendir, closedir, readdir, rewinddir, seekdir and
telldir mainly via assist calls.

We have to maintain a a copy of a struct dirent in SPU LS, and pass a
pointer to it for the readir() result: a set of static DIR entries are
used that includes a struct dirent, so only a small number of opendirs are
allowed.

newlib ChangeLog:

2007-09-20 Patrick Mansfield <patmans@us.ibm.com>
	* libc/machine/spu/sys/dirent.h: New file, add prototypes and SPU
	specific struct and typedef.

libgloss ChangeLog:

2007-09-20 Patrick Mansfield <patmans@us.ibm.com>
	* spu/dirfuncs.c: New file, holds the opendir, closedir, readdir,
	rewinddir, seekdir and telldir implementations. These are grouped
	in one file so that we do not need a separate file for the struct
	dirent and DIR allocation code.
	* spu/jsre.h: Add JSRE_OPENDIR and other dir opcodes.
	* spu/Makefile.in: Add dirfuncs.o.

Index: quilt/libgloss/spu/Makefile.in
===================================================================
--- quilt.orig/libgloss/spu/Makefile.in
+++ quilt/libgloss/spu/Makefile.in
@@ -55,7 +55,7 @@ OBJCOPY = `t='$(program_transform_name)'
 
 # object files needed
 OBJS = \
-	access.o chdir.o chmod.o chown.o close.o conv_stat.o dup.o \
+	access.o chdir.o chmod.o chown.o close.o conv_stat.o dirfuncs.o dup.o \
 	dup2.o exit.o fchdir.o fchmod.o fchown.o fdatasync.o fstat.o \
 	fsync.o ftruncate.o getcwd.o getpagesize.o getpid.o \
 	gettimeofday.o isatty.o kill.o lchown.o link.o lockf.o lseek.o \
Index: quilt/libgloss/spu/jsre.h
===================================================================
--- quilt.orig/libgloss/spu/jsre.h
+++ quilt/libgloss/spu/jsre.h
@@ -78,6 +78,12 @@ Author: Andreas Neukoetter (ti95neuk@de.
 #define JSRE_TRUNCATE 52
 #define JSRE_MKSTEMP 53
 #define JSRE_MKTEMP 54
+#define JSRE_OPENDIR 55
+#define JSRE_CLOSEDIR 56
+#define JSRE_READDIR 57
+#define JSRE_REWINDDIR 58
+#define JSRE_SEEKDIR 59
+#define JSRE_TELLDIR 60
 
 struct jsre_stat {
     unsigned int dev;
Index: quilt/newlib/libc/machine/spu/sys/dirent.h
===================================================================
--- /dev/null
+++ quilt/newlib/libc/machine/spu/sys/dirent.h
@@ -0,0 +1,57 @@
+/*
+  Copyright 2007
+  International Business Machines Corporation,
+  Sony Computer Entertainment, Incorporated,
+  Toshiba Corporation,
+
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice,
+  this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+    * Neither the names of the copyright holders nor the names of their
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+  PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+  OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+#ifndef _SYS_DIRENT_H
+#define _SYS_DIRENT_H
+
+#define MAXNAMLEN	255
+
+struct dirent {
+  ino_t  d_ino;
+  char   d_name[MAXNAMLEN + 1];
+};
+
+typedef struct {
+  unsigned long long ppc_dir;
+  /*
+   * Allow one readdir for each opendir, and store the data here.
+   */
+  struct dirent dirent;
+} DIR;
+
+DIR *opendir(const char *);
+int closedir(DIR *);
+struct dirent *readdir (DIR *);
+void rewinddir(DIR *);
+void seekdir(DIR *dir, off_t offset);
+off_t telldir(DIR *dir);
+#endif
Index: quilt/libgloss/spu/dirfuncs.c
===================================================================
--- /dev/null
+++ quilt/libgloss/spu/dirfuncs.c
@@ -0,0 +1,167 @@
+/*
+  Copyright 2007
+  International Business Machines Corporation,
+  Sony Computer Entertainment, Incorporated,
+  Toshiba Corporation,
+
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice,
+  this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+    * Neither the names of the copyright holders nor the names of their
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+  PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+  OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/*
+ * Put all of the dir functions in one file here, since it is not useful
+ * to use opendir without readdir, and then we can put the handling of the
+ * struct dirent here too.
+ */
+
+#include <stdint.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <errno.h>
+#include "jsre.h"
+
+/*
+ * The SPU DIR includes space for one dirent, and is 256 + 4 bytes in
+ * size, so keep this small.
+ */
+#define SPE_OPENDIR_MAX 4
+
+static DIR spe_dir[SPE_OPENDIR_MAX]; /* zero by default */
+
+typedef struct {
+  unsigned int name;
+  unsigned int pad0[3];
+} syscall_opendir_t;
+
+DIR *
+opendir (const char *name)
+{
+  DIR *dir;
+  int ppc_dir, i;
+  syscall_opendir_t sys;
+
+  sys.name = (unsigned int) name;
+  for (i = 0; i < SPE_OPENDIR_MAX; i++) {
+    if (!spe_dir[i].ppc_dir) {
+      dir = &spe_dir[i];
+      __send_to_ppe (JSRE_POSIX1_SIGNALCODE, JSRE_OPENDIR, &sys);
+      /*
+       * Pull 64 bits out of the result.
+       */
+      dir->ppc_dir = ((uint64_t*)&sys)[0];
+      if (!dir->ppc_dir) {
+        dir = NULL;
+      }
+      return dir;
+    }
+  }
+
+  errno = EMFILE;
+  return NULL;
+}
+
+int
+closedir (DIR *dir)
+{
+  int rc, i;
+  uint64_t ppc_dir;
+
+  if (dir) {
+    /*
+     * Don't pass &dir->ppc_dir to __send_to_ppe, since it would be
+     * overwritten by the assist call.
+     */
+    ppc_dir = dir->ppc_dir;
+    rc = __send_to_ppe (JSRE_POSIX1_SIGNALCODE, JSRE_CLOSEDIR, &ppc_dir);
+
+    /*
+     * Try to release the dir even if the closedir failed.
+     */
+    for (i = 0; i < SPE_OPENDIR_MAX; i++) {
+      if (spe_dir[i].ppc_dir == dir->ppc_dir) {
+        spe_dir[i].ppc_dir = 0;
+      }
+    }
+  } else {
+    /*
+     * Gracefully handle NULL, but not other invalid dir values.
+     */
+    rc = -1;
+    errno = EBADF;
+  }
+  return rc;
+}
+
+typedef struct {
+  uint64_t ppc_dir;
+  unsigned int pad0[2];
+  unsigned int dirent;
+  unsigned int pad1[3];
+} syscall_readdir_t;
+
+struct dirent *
+readdir (DIR *dir)
+{
+  syscall_readdir_t sys;
+
+  sys.ppc_dir = dir->ppc_dir;
+  sys.dirent = (unsigned int) &dir->dirent;
+  return (struct dirent *) __send_to_ppe (JSRE_POSIX1_SIGNALCODE,
+                                         JSRE_READDIR, &sys);
+}
+
+void
+rewinddir (DIR *dir)
+{
+  uint64_t ppc_dir = dir->ppc_dir;
+
+  __send_to_ppe (JSRE_POSIX1_SIGNALCODE, JSRE_REWINDDIR, &ppc_dir);
+}
+
+typedef struct {
+  uint64_t ppc_dir;
+  unsigned int pad0[2];
+  unsigned int offset;
+  unsigned int pad1[3];
+} syscall_seekdir_t;
+
+void
+seekdir (DIR *dir, off_t offset)
+{
+  syscall_seekdir_t sys;
+
+  sys.ppc_dir = dir->ppc_dir;
+  sys.offset = offset;
+  __send_to_ppe (JSRE_POSIX1_SIGNALCODE, JSRE_SEEKDIR, &sys);
+}
+
+off_t
+telldir (DIR *dir)
+{
+  uint64_t ppc_dir = dir->ppc_dir;
+
+  __send_to_ppe (JSRE_POSIX1_SIGNALCODE, JSRE_TELLDIR, &ppc_dir);
+}