[PATCH 3/8] SPU add getcwd support mainly via an assist call

[Jeff Johnston]

Patch checked in.

-- Jeff J.

Patrick Mansfield wrote:
> Add spu getcwd support, mainly via an assist call.
> 
> libgloss ChangeLog:
> 
> 2007-06-18 Patrick Mansfield <patmans@us.ibm.com>
> 
> 	* spu/jsre.h: Add JSRE_GETCWD.
> 	* spu/getcwd.c: New file, implement getcwd with help from an
> 	assist call.
> 	* spu/Makefile.in: Add getcwd.
> 
> Index: quilt/libgloss/spu/Makefile.in
> ===================================================================
> --- quilt.orig/libgloss/spu/Makefile.in
> +++ quilt/libgloss/spu/Makefile.in
> @@ -56,7 +56,7 @@ OBJCOPY = `t='$(program_transform_name)'
>  # object files needed
>  OBJS = \
>  	access.o chdir.o chmod.o chown.o close.o dup.o exit.o fchdir.o \
> -	fchmod.o fchown.o fstat.o ftruncate.o getpagesize.o getpid.o \
> +	fchmod.o fchown.o fstat.o ftruncate.o getcwd.o getpagesize.o getpid.o \
>  	gettimeofday.o isatty.o kill.o lchown.o lseek.o mkdir.o \
>  	mknod.o nanosleep.o open.o read.o rmdir.o sbrk.o stat.o syscalls.o \
>  	unlink.o write.o
> Index: quilt/libgloss/spu/getcwd.c
> ===================================================================
> --- /dev/null
> +++ quilt/libgloss/spu/getcwd.c
> @@ -0,0 +1,109 @@
> +/*
> +  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.
> +*/
> +
> +#include <stdlib.h>
> +#include <unistd.h>
> +#include <errno.h>
> +#include "jsre.h"
> +
> +#define ALLOC_BASE  64
> +#define ALLOC_INCR  64
> +
> +typedef struct
> +{
> +  unsigned int buf;
> +  unsigned int pad0[3];
> +  unsigned int size;
> +  unsigned int pad1[3];
> +} syscall_getcwd_t;
> +
> +char *
> +getcwd (char *buf, size_t size)
> +{
> +  syscall_getcwd_t sys;
> +  int retry_alloc, local_alloc;
> +  char *newbuf;
> +  char *res;
> +
> +  /*
> +   * Do not let the ppu side allocate memory, since it has to be used on
> +   * the SPU (must be in LS), and it can't easily be freed on the spu
> +   * side. So check for NULL buf, handle allocations here, and only call
> +   * the assist call with a non-NULL buf.
> +   */
> +  retry_alloc = 0;
> +  local_alloc = 0;
> +  if (!buf) {
> +    local_alloc = 1;
> +    if (size == 0) {
> +      retry_alloc = 1;
> +      size = ALLOC_BASE;
> +    }
> +    buf = malloc (size);
> +    if (!buf) {
> +      /*
> +       * Leave errno as set by malloc.
> +       */
> +      return NULL;
> +    }
> +  }
> +
> +  /*
> +   * Let the assist call check for error cases, specifically let it handle
> +   * non-NULL buf and size of zero.
> +   */
> +
> +  sys.buf = (unsigned int) buf;
> +  sys.size = (unsigned int) size;
> +  res = (char*) __send_to_ppe (JSRE_POSIX1_SIGNALCODE, JSRE_GETCWD, &sys);
> +
> +  while (!res && retry_alloc && errno == ERANGE) {
> +    size += ALLOC_INCR;
> +    newbuf = realloc (buf, size);
> +    if (!newbuf) {
> +      free (buf);
> +      return NULL;
> +    }
> +    buf = newbuf;
> +
> +    sys.buf = (unsigned int) buf;
> +    sys.size = (unsigned int) size;
> +    res = (char*) __send_to_ppe (JSRE_POSIX1_SIGNALCODE, JSRE_GETCWD, &sys);
> +  }
> +
> +  if (!res && local_alloc) {
> +    free (buf);
> +  }
> +
> +  return res;
> +}
> Index: quilt/libgloss/spu/jsre.h
> ===================================================================
> --- quilt.orig/libgloss/spu/jsre.h
> +++ quilt/libgloss/spu/jsre.h
> @@ -62,6 +62,7 @@ Author: Andreas Neukoetter (ti95neuk@de.
>  #define JSRE_CHOWN 40
>  #define JSRE_FCHOWN 41
>  #define JSRE_LCHOWN 42
> +#define JSRE_GETCWD 43
>  
>  typedef struct {
>      unsigned int dev;