Bugzilla Bug 298674: initial checkin of the RISC OS port contributed by

Peter Naulls <peter@chocky.org>. r=wtc.
Modified files: configure configure.in _pth.h prosdep.h prlink.c
                prmem.c unix.c uxrng.c prsystem.c ptio.c ptthread.c
Added files: _riscos.cfg _riscos.h riscos.c

13 files changed, 544 insertions, 32 deletions

diff --git a/configure b/configure
index 461f38cf..a335d56c 100755
--- a/configure
+++ b/configure
@@ -4407,6 +4407,26 @@ EOF
     PR_MD_CSRCS=qnx.c
     ;;
 
+*-riscos*)
+    cat >> confdefs.h <<\EOF
+#define XP_UNIX 1
+EOF
+
+    cat >> confdefs.h <<\EOF
+#define RISCOS 1
+EOF
+
+    cat >> confdefs.h <<\EOF
+#define _PR_NEED_H_ERRNO 1
+EOF
+
+    USE_PTHREADS=1
+    MDCPUCFG_H=_riscos.cfg
+    PR_MD_CSRCS=riscos.c
+    DLL_SUFFIX=a
+    LD="/home/riscos/env/ro-ar cr"
+    ;;
+
 *-*-sco*)
     cat >> confdefs.h <<\EOF
 #define XP_UNIX 1
@@ -4876,7 +4896,7 @@ case $target in
     ;;
 *)
     echo $ac_n "checking for dlopen in -ldl""... $ac_c" 1>&6
-echo "configure:4880: checking for dlopen in -ldl" >&5
+echo "configure:4900: checking for dlopen in -ldl" >&5
 ac_lib_var=`echo dl'_'dlopen | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4884,7 +4904,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-ldl  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4888 "configure"
+#line 4908 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -4895,7 +4915,7 @@ int main() {
 dlopen()
 ; return 0; }
 EOF
-if { (eval echo configure:4899: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4919: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4912,17 +4932,17 @@ if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
   echo "$ac_t""yes" 1>&6
   ac_safe=`echo "dlfcn.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for dlfcn.h""... $ac_c" 1>&6
-echo "configure:4916: checking for dlfcn.h" >&5
+echo "configure:4936: checking for dlfcn.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4921 "configure"
+#line 4941 "configure"
 #include "confdefs.h"
 #include <dlfcn.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:4926: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:4946: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -4955,13 +4975,13 @@ esac
 
 if test $ac_cv_prog_gcc = yes; then
     echo $ac_n "checking whether ${CC-cc} needs -traditional""... $ac_c" 1>&6
-echo "configure:4959: checking whether ${CC-cc} needs -traditional" >&5
+echo "configure:4979: checking whether ${CC-cc} needs -traditional" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_gcc_traditional'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
     ac_pattern="Autoconf.*'x'"
   cat > conftest.$ac_ext <<EOF
-#line 4965 "configure"
+#line 4985 "configure"
 #include "confdefs.h"
 #include <sgtty.h>
 Autoconf TIOCGETP
@@ -4979,7 +4999,7 @@ rm -f conftest*
 
   if test $ac_cv_prog_gcc_traditional = no; then
     cat > conftest.$ac_ext <<EOF
-#line 4983 "configure"
+#line 5003 "configure"
 #include "confdefs.h"
 #include <termio.h>
 Autoconf TCGETA
@@ -5003,12 +5023,12 @@ fi
 for ac_func in lchown strerror
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:5007: checking for $ac_func" >&5
+echo "configure:5027: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5012 "configure"
+#line 5032 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -5031,7 +5051,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:5035: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5055: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -5072,7 +5092,7 @@ hpux*)
 if test -z "$GNU_CC"; then
 
     echo $ac_n "checking for +Olit support""... $ac_c" 1>&6
-echo "configure:5076: checking for +Olit support" >&5
+echo "configure:5096: checking for +Olit support" >&5
 if eval "test \"`echo '$''{'ac_cv_hpux_usable_olit_option'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -5106,7 +5126,7 @@ esac
 
 
 echo $ac_n "checking for pthread_create in -lpthreads""... $ac_c" 1>&6
-echo "configure:5110: checking for pthread_create in -lpthreads" >&5
+echo "configure:5130: checking for pthread_create in -lpthreads" >&5
 echo "
     #include <pthread.h> 
     void *foo(void *v) { return v; } 
@@ -5128,7 +5148,7 @@ echo "
         echo "$ac_t""no" 1>&6
         
 echo $ac_n "checking for pthread_create in -lpthread""... $ac_c" 1>&6
-echo "configure:5132: checking for pthread_create in -lpthread" >&5
+echo "configure:5152: checking for pthread_create in -lpthread" >&5
 echo "
     #include <pthread.h> 
     void *foo(void *v) { return v; } 
@@ -5150,7 +5170,7 @@ echo "
         echo "$ac_t""no" 1>&6
         
 echo $ac_n "checking for pthread_create in -lc_r""... $ac_c" 1>&6
-echo "configure:5154: checking for pthread_create in -lc_r" >&5
+echo "configure:5174: checking for pthread_create in -lc_r" >&5
 echo "
     #include <pthread.h> 
     void *foo(void *v) { return v; } 
@@ -5172,7 +5192,7 @@ echo "
         echo "$ac_t""no" 1>&6
         
 echo $ac_n "checking for pthread_create in -lc""... $ac_c" 1>&6
-echo "configure:5176: checking for pthread_create in -lc" >&5
+echo "configure:5196: checking for pthread_create in -lc" >&5
 echo "
     #include <pthread.h> 
     void *foo(void *v) { return v; } 
@@ -5324,7 +5344,7 @@ if test -n "$USE_PTHREADS"; then
       rm -f conftest*
    ac_cv_have_dash_pthread=no
    echo $ac_n "checking whether ${CC-cc} accepts -pthread""... $ac_c" 1>&6
-echo "configure:5328: checking whether ${CC-cc} accepts -pthread" >&5
+echo "configure:5348: checking whether ${CC-cc} accepts -pthread" >&5
    echo 'int main() { return 0; }' | cat > conftest.c
    ${CC-cc} -pthread -o conftest conftest.c > conftest.out 2>&1
    if test $? -eq 0; then
@@ -5347,7 +5367,7 @@ echo "configure:5328: checking whether ${CC-cc} accepts -pthread" >&5
 			    ac_cv_have_dash_pthreads=no
     if test "$ac_cv_have_dash_pthread" = "no"; then
 	    echo $ac_n "checking whether ${CC-cc} accepts -pthreads""... $ac_c" 1>&6
-echo "configure:5351: checking whether ${CC-cc} accepts -pthreads" >&5
+echo "configure:5371: checking whether ${CC-cc} accepts -pthreads" >&5
     	echo 'int main() { return 0; }' | cat > conftest.c
 	    ${CC-cc} -pthreads -o conftest conftest.c > conftest.out 2>&1
     	if test $? -eq 0; then
diff --git a/configure.in b/configure.in
index 434d589e..9e9fdefd 100644
--- a/configure.in
+++ b/configure.in
@@ -1692,6 +1692,17 @@ mips-sony-newsos*)
     PR_MD_CSRCS=qnx.c
     ;;
 
+*-riscos*)
+    AC_DEFINE(XP_UNIX)
+    AC_DEFINE(RISCOS)
+    AC_DEFINE(_PR_NEED_H_ERRNO)
+    USE_PTHREADS=1
+    MDCPUCFG_H=_riscos.cfg
+    PR_MD_CSRCS=riscos.c
+    DLL_SUFFIX=a
+    LD="/home/riscos/env/ro-ar cr"
+    ;;
+
 *-*-sco*)
     AC_DEFINE(XP_UNIX)
     AC_DEFINE(SCO)
diff --git a/pr/include/md/_pth.h b/pr/include/md/_pth.h
index eb5c5dde..e867026e 100644
--- a/pr/include/md/_pth.h
+++ b/pr/include/md/_pth.h
@@ -146,7 +146,7 @@
 	|| defined(HPUX) || defined(LINUX) || defined(FREEBSD) \
 	|| defined(NETBSD) || defined(OPENBSD) || defined(BSDI) \
 	|| defined(VMS) || defined(NTO) || defined(DARWIN) \
-	|| defined(UNIXWARE)
+	|| defined(UNIXWARE) || defined(RISCOS)
 #define _PT_PTHREAD_INVALIDATE_THR_HANDLE(t)  (t) = 0
 #define _PT_PTHREAD_THR_HANDLE_IS_INVALID(t)  (t) == 0
 #define _PT_PTHREAD_COPY_THR_HANDLE(st, dt)   (dt) = (st)
@@ -259,7 +259,8 @@
 #define PT_PRIO_MIN            0
 #define PT_PRIO_MAX            31
 #elif defined(NETBSD) \
-	|| defined(BSDI) || defined(DARWIN) || defined(UNIXWARE) /* XXX */
+	|| defined(BSDI) || defined(DARWIN) || defined(UNIXWARE) \
+	|| defined(RISCOS) /* XXX */
 #define PT_PRIO_MIN            0
 #define PT_PRIO_MAX            126
 #else
diff --git a/pr/include/md/_riscos.cfg b/pr/include/md/_riscos.cfg
new file mode 100644
index 00000000..7a241fa5
--- /dev/null
+++ b/pr/include/md/_riscos.cfg
@@ -0,0 +1,132 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the Netscape Portable Runtime (NSPR).
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998-2000
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef nspr_cpucfg___
+#define nspr_cpucfg___
+
+#ifndef XP_UNIX
+#define XP_UNIX
+#endif
+
+#ifndef RISCOS
+#define RISCOS
+#endif
+
+#define IS_LITTLE_ENDIAN 1
+#undef  IS_BIG_ENDIAN
+#define HAVE_LONG_LONG
+#undef  HAVE_ALIGNED_DOUBLES
+#undef  HAVE_ALIGNED_LONGLONGS
+
+#define PR_BYTES_PER_BYTE   1
+#define PR_BYTES_PER_SHORT  2
+#define PR_BYTES_PER_INT    4
+#define PR_BYTES_PER_INT64  8
+#define PR_BYTES_PER_LONG   4
+#define PR_BYTES_PER_FLOAT  4
+#define PR_BYTES_PER_DOUBLE 8
+#define PR_BYTES_PER_WORD   4
+#define PR_BYTES_PER_DWORD  8
+
+#define PR_BITS_PER_BYTE    8
+#define PR_BITS_PER_SHORT   16
+#define PR_BITS_PER_INT     32
+#define PR_BITS_PER_INT64   64
+#define PR_BITS_PER_LONG    32
+#define PR_BITS_PER_FLOAT   32
+#define PR_BITS_PER_DOUBLE  64
+#define PR_BITS_PER_WORD    32
+
+#define PR_BITS_PER_BYTE_LOG2   3
+#define PR_BITS_PER_SHORT_LOG2  4
+#define PR_BITS_PER_INT_LOG2    5
+#define PR_BITS_PER_INT64_LOG2  6
+#define PR_BITS_PER_LONG_LOG2   5
+#define PR_BITS_PER_FLOAT_LOG2  5
+#define PR_BITS_PER_DOUBLE_LOG2 6
+#define PR_BITS_PER_WORD_LOG2   5
+
+#define PR_BYTES_PER_WORD_LOG2   2
+#define PR_BYTES_PER_DWORD_LOG2  3
+#define PR_WORDS_PER_DWORD_LOG2  1
+
+#ifndef NO_NSPR_10_SUPPORT
+
+#define BYTES_PER_BYTE		PR_BYTES_PER_BYTE
+#define BYTES_PER_SHORT 	PR_BYTES_PER_SHORT
+#define BYTES_PER_INT 		PR_BYTES_PER_INT
+#define BYTES_PER_INT64		PR_BYTES_PER_INT64
+#define BYTES_PER_LONG		PR_BYTES_PER_LONG
+#define BYTES_PER_FLOAT		PR_BYTES_PER_FLOAT
+#define BYTES_PER_DOUBLE	PR_BYTES_PER_DOUBLE
+#define BYTES_PER_WORD		PR_BYTES_PER_WORD
+#define BYTES_PER_DWORD		PR_BYTES_PER_DWORD
+
+#define BITS_PER_BYTE		PR_BITS_PER_BYTE
+#define BITS_PER_SHORT		PR_BITS_PER_SHORT
+#define BITS_PER_INT		PR_BITS_PER_INT
+#define BITS_PER_INT64		PR_BITS_PER_INT64
+#define BITS_PER_LONG		PR_BITS_PER_LONG
+#define BITS_PER_FLOAT		PR_BITS_PER_FLOAT
+#define BITS_PER_DOUBLE		PR_BITS_PER_DOUBLE
+#define BITS_PER_WORD		PR_BITS_PER_WORD
+
+#define BITS_PER_BYTE_LOG2	PR_BITS_PER_BYTE_LOG2
+#define BITS_PER_SHORT_LOG2	PR_BITS_PER_SHORT_LOG2
+#define BITS_PER_INT_LOG2	PR_BITS_PER_INT_LOG2
+#define BITS_PER_INT64_LOG2	PR_BITS_PER_INT64_LOG2
+#define BITS_PER_LONG_LOG2	PR_BITS_PER_LONG_LOG2
+#define BITS_PER_FLOAT_LOG2	PR_BITS_PER_FLOAT_LOG2
+#define BITS_PER_DOUBLE_LOG2 	PR_BITS_PER_DOUBLE_LOG2
+#define BITS_PER_WORD_LOG2	PR_BITS_PER_WORD_LOG2
+
+#define ALIGN_OF_SHORT		PR_ALIGN_OF_SHORT
+#define ALIGN_OF_INT		PR_ALIGN_OF_INT
+#define ALIGN_OF_LONG		PR_ALIGN_OF_LONG
+#define ALIGN_OF_INT64		PR_ALIGN_OF_INT64
+#define ALIGN_OF_FLOAT		PR_ALIGN_OF_FLOAT
+#define ALIGN_OF_DOUBLE		PR_ALIGN_OF_DOUBLE
+#define ALIGN_OF_POINTER	PR_ALIGN_OF_POINTER
+#define ALIGN_OF_WORD		PR_ALIGN_OF_WORD
+
+#define BYTES_PER_WORD_LOG2	PR_BYTES_PER_WORD_LOG2
+#define BYTES_PER_DWORD_LOG2	PR_BYTES_PER_DWORD_LOG2
+#define WORDS_PER_DWORD_LOG2	PR_WORDS_PER_DWORD_LOG2
+
+#endif /* NO_NSPR_10_SUPPORT */
+
+#endif /* nspr_cpucfg___ */
diff --git a/pr/include/md/_riscos.h b/pr/include/md/_riscos.h
new file mode 100644
index 00000000..714a9ad9
--- /dev/null
+++ b/pr/include/md/_riscos.h
@@ -0,0 +1,213 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the Netscape Portable Runtime (NSPR).
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998-2000
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Peter Naulls <peter@chocky.org>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef nspr_riscos_defs_h___
+#define nspr_riscos_defs_h___
+
+/*
+** Internal configuration macros
+*/
+#define PR_LINKER_ARCH		"riscos"
+#define _PR_SI_SYSNAME		"RISCOS"
+#define _PR_SI_ARCHITECTURE	"arm"
+#define PR_DLL_SUFFIX		".a"
+
+#define _PR_POLL_AVAILABLE
+#define _PR_USE_POLL
+#define _PR_HAVE_SOCKADDR_LEN
+#undef HAVE_BSD_FLOCK
+#define _PR_NO_LARGE_FILES
+#define _PR_STAT_HAS_ONLY_ST_ATIME
+#define _PR_HAVE_POSIX_SEMAPHORES
+
+#define uint unsigned int
+
+#undef atoll
+
+#include <sys/select.h>
+#include <sys/poll.h>
+#include <kernel.h>
+
+
+#undef  HAVE_STACK_GROWING_UP
+#undef	HAVE_DLL
+#undef	USE_DLFCN
+#define NEED_STRFTIME_LOCK
+#define NEED_TIME_R
+#define PT_NO_SIGTIMEDWAIT
+
+#ifndef HAVE_STRERROR
+#define HAVE_STRERROR
+#endif
+
+#define USE_SETJMP
+
+#include <setjmp.h>
+
+#define _SETJMP			setjmp
+#define _LONGJMP		longjmp
+#define _PR_CONTEXT_TYPE	jmp_buf
+#define _PR_NUM_GCREGS		_JBLEN
+#define _MD_GET_SP(_t)		(_t)->md.context[7]
+
+#define CONTEXT(_th)		((_th)->md.context)
+
+
+/*
+** Initialize the thread context preparing it to execute _main.
+*/
+#define _MD_INIT_CONTEXT(_thread, _sp, _main, status)	\
+{							\
+    *status = PR_TRUE;					\
+    if(_SETJMP(CONTEXT(_thread))) (*_main)();		\
+    _MD_GET_SP(_thread) = (int) ((_sp) - 128);		\
+}
+
+#define _MD_SWITCH_CONTEXT(_thread)	\
+    if (!_SETJMP(CONTEXT(_thread))) {	\
+	(_thread)->md.errcode = errno;	\
+	_PR_Schedule();			\
+    }
+
+/*
+** Restore a thread context, saved by _MD_SWITCH_CONTEXT
+*/
+#define _MD_RESTORE_CONTEXT(_thread)	\
+{					\
+    errno = (_thread)->md.errcode;	\
+    _MD_SET_CURRENT_THREAD(_thread);	\
+    _LONGJMP(CONTEXT(_thread), 1);	\
+}
+
+/*
+** Machine-dependent (MD) data structures.
+*/
+struct _MDThread {
+    _PR_CONTEXT_TYPE context;
+    int id;
+    int errcode;
+};
+
+struct _MDThreadStack {
+    PRInt8 notused;
+};
+
+struct _MDLock {
+    PRInt8 notused;
+};
+
+struct _MDSemaphore {
+    PRInt8 notused;
+};
+
+struct _MDCVar {
+    PRInt8 notused;
+};
+
+struct _MDSegment {
+    PRInt8 notused;
+};
+
+/*
+** md-specific cpu structure field
+*/
+#define _PR_MD_MAX_OSFD		FD_SETSIZE
+
+struct _MDCPU_Unix {
+    PRCList ioQ;
+    PRUint32 ioq_timeout;
+    PRInt32 ioq_max_osfd;
+    PRInt32 ioq_osfd_cnt;
+#ifndef _PR_USE_POLL
+    fd_set fd_read_set, fd_write_set, fd_exception_set;
+    PRInt16 fd_read_cnt[_PR_MD_MAX_OSFD], fd_write_cnt[_PR_MD_MAX_OSFD], fd_exception_cnt[_PR_MD_MAX_OSFD];
+#else
+    struct pollfd *ioq_pollfds;
+    int ioq_pollfds_size;
+#endif
+};
+
+#define _PR_IOQ(_cpu)	/*	*/	((_cpu)->md.md_unix.ioQ)
+#define _PR_ADD_TO_IOQ(_pq, _cpu)	PR_APPEND_LINK(&_pq.links, &_PR_IOQ(_cpu))
+#define _PR_FD_READ_SET(_cpu)		((_cpu)->md.md_unix.fd_read_set)
+#define _PR_FD_READ_CNT(_cpu)		((_cpu)->md.md_unix.fd_read_cnt)
+#define _PR_FD_WRITE_SET(_cpu)		((_cpu)->md.md_unix.fd_write_set)
+#define _PR_FD_WRITE_CNT(_cpu)		((_cpu)->md.md_unix.fd_write_cnt)
+#define _PR_FD_EXCEPTION_SET(_cpu)	((_cpu)->md.md_unix.fd_exception_set)
+#define _PR_FD_EXCEPTION_CNT(_cpu)	((_cpu)->md.md_unix.fd_exception_cnt)
+#define _PR_IOQ_TIMEOUT(_cpu)		((_cpu)->md.md_unix.ioq_timeout)
+#define _PR_IOQ_MAX_OSFD(_cpu)		((_cpu)->md.md_unix.ioq_max_osfd)
+#define _PR_IOQ_OSFD_CNT(_cpu)		((_cpu)->md.md_unix.ioq_osfd_cnt)
+#define _PR_IOQ_POLLFDS(_cpu)		((_cpu)->md.md_unix.ioq_pollfds)
+#define _PR_IOQ_POLLFDS_SIZE(_cpu)	((_cpu)->md.md_unix.ioq_pollfds_size)
+
+#define _PR_IOQ_MIN_POLLFDS_SIZE(_cpu)	32
+
+struct _MDCPU {
+	struct _MDCPU_Unix md_unix;
+};
+
+#define _MD_INIT_LOCKS()
+#define _MD_NEW_LOCK(lock)		PR_SUCCESS
+#define _MD_FREE_LOCK(lock)
+#define _MD_LOCK(lock)
+#define _MD_UNLOCK(lock)
+#define _MD_INIT_IO()
+#define _MD_IOQ_LOCK()
+#define _MD_IOQ_UNLOCK()
+
+#define _MD_GET_INTERVAL		_PR_UNIX_GetInterval
+#define _MD_INTERVAL_PER_SEC		_PR_UNIX_TicksPerSecond
+#define _MD_EARLY_INIT			_MD_EarlyInit
+#define _MD_FINAL_INIT			_PR_UnixInit
+#define _MD_INIT_RUNNING_CPU(cpu)	_MD_unix_init_running_cpu(cpu)
+#define _MD_INIT_THREAD			_MD_InitializeThread
+#define _MD_EXIT_THREAD(thread)
+#define	_MD_SUSPEND_THREAD(thread)
+#define	_MD_RESUME_THREAD(thread)
+#define _MD_CLEAN_THREAD(_thread)
+
+/*
+** We wrapped the select() call.  _MD_SELECT refers to the built-in,
+** unwrapped version.
+*/
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/select.h>
+#define _MD_SELECT		select
+
+#endif /* nspr_riscos_defs_h___ */
diff --git a/pr/include/md/prosdep.h b/pr/include/md/prosdep.h
index 93496520..3e141d02 100644
--- a/pr/include/md/prosdep.h
+++ b/pr/include/md/prosdep.h
@@ -138,6 +138,9 @@ PR_BEGIN_EXTERN_C
 #elif defined(NTO)
 #include "md/_nto.h"
 
+#elif defined(RISCOS)
+#include "md/_riscos.h"
+
 #else
 #error unknown Unix flavor
 
diff --git a/pr/src/linking/prlink.c b/pr/src/linking/prlink.c
index 325decb5..b0a3469b 100644
--- a/pr/src/linking/prlink.c
+++ b/pr/src/linking/prlink.c
@@ -262,9 +262,7 @@ static void DLLErrorInternal(PRIntn oserr)
 
 void _PR_InitLinker(void)
 {
-#if !defined(XP_MAC) && !defined(XP_BEOS)
-    PRLibrary *lm;
-#endif
+    PRLibrary *lm = NULL;
 #if defined(XP_UNIX)
     void *h;
 #endif
@@ -331,9 +329,10 @@ void _PR_InitLinker(void)
 #endif /* HAVE_DLL */
 #endif /* XP_UNIX */
 
-#if !defined(XP_MAC) && !defined(XP_BEOS)
-    PR_LOG(_pr_linker_lm, PR_LOG_MIN, ("Loaded library %s (init)", lm?lm->name:"NULL"));
-#endif
+    if (lm) {
+        PR_LOG(_pr_linker_lm, PR_LOG_MIN,
+            ("Loaded library %s (init)", lm->name));
+    }
 
     PR_ExitMonitor(pr_linker_lock);
 }
diff --git a/pr/src/malloc/prmem.c b/pr/src/malloc/prmem.c
index 59077c24..9243158f 100644
--- a/pr/src/malloc/prmem.c
+++ b/pr/src/malloc/prmem.c
@@ -115,6 +115,8 @@ _PR_DestroyZones(void)
 ** its address.
 */
 
+#ifdef HAVE_DLL
+
 #ifdef USE_DLFCN
 
 #include <dlfcn.h>
@@ -163,6 +165,16 @@ pr_FindSymbolInProg(const char *name)
 
 #endif
 
+#else /* !defined(HAVE_DLL) */
+
+static void *
+pr_FindSymbolInProg(const char *name)
+{
+    /* can't be implemented */
+    return NULL;
+
+#endif /* HAVE_DLL */
+
 void
 _PR_InitZones(void)
 {
diff --git a/pr/src/md/unix/riscos.c b/pr/src/md/unix/riscos.c
new file mode 100644
index 00000000..eee94d3d
--- /dev/null
+++ b/pr/src/md/unix/riscos.c
@@ -0,0 +1,120 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the Netscape Portable Runtime (NSPR).
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998-2000
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Peter Naulls <peter@chocky.org>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "primpl.h"
+
+void _MD_EarlyInit(void)
+{
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+#ifndef _PR_PTHREADS
+    if (isCurrent) {
+	(void) setjmp(CONTEXT(t));
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+#else
+	*np = 0;
+	return NULL;
+#endif
+}
+
+#ifdef _PR_PTHREADS
+
+void _MD_CleanupBeforeExit(void)
+{
+}
+
+#else /* ! _PR_PTHREADS */
+
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+	/*
+	 * set the pointers to the stack-pointer and frame-pointer words in the
+	 * context structure; this is for debugging use.
+	 */
+	thread->md.sp = _MD_GET_SP_PTR(thread);
+	thread->md.fp = _MD_GET_FP_PTR(thread);
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+	PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for RISC OS */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for RISC OS.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for RISC OS.");
+	return PR_FAILURE;
+}
+#endif /* ! _PR_PTHREADS */
diff --git a/pr/src/md/unix/unix.c b/pr/src/md/unix/unix.c
index eb73f053..0776bf1a 100644
--- a/pr/src/md/unix/unix.c
+++ b/pr/src/md/unix/unix.c
@@ -75,7 +75,7 @@
 #define _PRSockLen_t int
 #elif (defined(AIX) && !defined(AIX4_1)) || defined(FREEBSD) \
     || defined(NETBSD) || defined(OPENBSD) || defined(UNIXWARE) \
-    || defined(DGUX) || defined(VMS) || defined(NTO)
+    || defined(DGUX) || defined(VMS) || defined(NTO) || defined(RISCOS)
 #define _PRSockLen_t size_t
 #else
 #error "Cannot determine architecture"
diff --git a/pr/src/md/unix/uxrng.c b/pr/src/md/unix/uxrng.c
index 9099c5ff..9e912277 100644
--- a/pr/src/md/unix/uxrng.c
+++ b/pr/src/md/unix/uxrng.c
@@ -298,7 +298,7 @@ GetHighResClock(void *buf, size_t maxbytes)
     return 0;
 }
 #elif defined(SCO) || defined(UNIXWARE) || defined(BSDI) || defined(NTO) \
-    || defined(QNX) || defined(DARWIN)
+    || defined(QNX) || defined(DARWIN) || defined(RISCOS)
 #include <sys/times.h>
 
 static size_t
diff --git a/pr/src/pthreads/ptio.c b/pr/src/pthreads/ptio.c
index 8c6e7e97..7a4ce96f 100644
--- a/pr/src/pthreads/ptio.c
+++ b/pr/src/pthreads/ptio.c
@@ -208,7 +208,7 @@ static PRBool _pr_ipv6_v6only_on_by_default;
     || defined(HPUX10_30) || defined(HPUX11) || defined(LINUX) \
     || defined(FREEBSD) || defined(NETBSD) || defined(OPENBSD) \
     || defined(BSDI) || defined(VMS) || defined(NTO) || defined(DARWIN) \
-    || defined(UNIXWARE)
+    || defined(UNIXWARE) || defined(RISCOS)
 #define _PRSelectFdSetArg_t fd_set *
 #else
 #error "Cannot determine architecture"
@@ -3232,7 +3232,7 @@ static PRIOMethods _pr_socketpollfd_methods = {
 #if defined(HPUX) || defined(OSF1) || defined(SOLARIS) || defined (IRIX) \
     || defined(AIX) || defined(LINUX) || defined(FREEBSD) || defined(NETBSD) \
     || defined(OPENBSD) || defined(BSDI) || defined(VMS) || defined(NTO) \
-    || defined(DARWIN) || defined(UNIXWARE)
+    || defined(DARWIN) || defined(UNIXWARE) || defined(RISCOS)
 #define _PR_FCNTL_FLAGS O_NONBLOCK
 #else
 #error "Can't determine architecture"
diff --git a/pr/src/pthreads/ptthread.c b/pr/src/pthreads/ptthread.c
index 5d3d75c7..c8b41c11 100644
--- a/pr/src/pthreads/ptthread.c
+++ b/pr/src/pthreads/ptthread.c
@@ -1233,7 +1233,8 @@ static void suspend_signal_handler(PRIntn sig)
 	while (me->suspend & PT_THREAD_SUSPENDED)
 	{
 #if !defined(FREEBSD) && !defined(NETBSD) && !defined(OPENBSD) \
-    && !defined(BSDI) && !defined(VMS) && !defined(UNIXWARE) && !defined(DARWIN)  /*XXX*/
+    && !defined(BSDI) && !defined(VMS) && !defined(UNIXWARE) \
+    && !defined(DARWIN) && !defined(RISCOS) /*XXX*/
         PRIntn rv;
 	    sigwait(&sigwait_set, &rv);
 #endif