The ELF loader is basically functional (needs more testing)

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5265 42af7a65-404d-4744-a932-0658087f49c3

16 files changed, 242 insertions, 265 deletions

diff --git a/apps/examples/README.txt b/apps/examples/README.txt
index bfb92b6b7..70dffc989 100644
--- a/apps/examples/README.txt
+++ b/apps/examples/README.txt
@@ -318,7 +318,12 @@ examples/elf
 
   NOTES:
 
-  1. Your top-level nuttx/Make.defs file must include an approproate definition,
+  1. CFLAGS should be provided in CELFFLAGS.  RAM and FLASH memory regions
+     may require long allcs.  For ARM, this might be:
+
+       CELFFLAGS = $(CFLAGS) -mlong-calls
+
+  2. Your top-level nuttx/Make.defs file must alos include an approproate definition,
      LDELFFLAGS, to generate a relocatable ELF object.  With GNU LD, this should
      include '-r' and '-e main' (or _main on some platforms).
 
@@ -327,24 +332,24 @@ examples/elf
      If you use GCC to link, you make also need to include '-nostdlib' or 
      '-nostartfiles' and '-nodefaultlibs'.
 
-  2. This example also requires genromfs.  genromfs can be build as part of the
+  3. This example also requires genromfs.  genromfs can be build as part of the
      nuttx toolchain.  Or can built from the genromfs sources that can be found
      at misc/tools/genromfs-0.5.2.tar.gz.  In any event, the PATH variable must
      include the path to the genromfs executable.
 
-  3. ELF size:  The ELF files in this example are, be default, quite large
+  4. ELF size:  The ELF files in this example are, be default, quite large
      because they include a lot of "build garbage".  You can greatly reduce the
      size of the ELF binaries are using the 'objcopy --strip-unneeded' command to
      remove un-necessary information from the ELF files.
 
-  4. Simulator.  You cannot use this example with the the NuttX simulator on
+  5. Simulator.  You cannot use this example with the the NuttX simulator on
      Cygwin.  That is because the Cygwin GCC does not generate ELF file but
      rather some Windows-native binary format.
 
      If you really want to do this, you can create a NuttX x86 buildroot toolchain
      and use that be build the ELF executables for the ROMFS file system.
 
-  5. Linker scripts.  You might also want to use a linker scripts to combine
+  6. Linker scripts.  You might also want to use a linker scripts to combine
      sections better.  An example linker script is at nuttx/binfmt/libelf/gnu-elf.ld.
      That example might have to be tuned for your particular linker output to
      position additional sections correctly.  The GNU LD LDELFFLAGS then might
diff --git a/apps/examples/elf/Makefile b/apps/examples/elf/Makefile
index 23a6bcb6f..ea483e7a1 100644
--- a/apps/examples/elf/Makefile
+++ b/apps/examples/elf/Makefile
@@ -39,29 +39,29 @@ include $(APPDIR)/Make.defs
 
 # ELF Example
 
-ASRCS		=
-CSRCS		= elf_main.c
+ASRCS =
+CSRCS = elf_main.c symtab.c
 
-AOBJS		= $(ASRCS:.S=$(OBJEXT))
-COBJS		= $(CSRCS:.c=$(OBJEXT))
+AOBJS = $(ASRCS:.S=$(OBJEXT))
+COBJS = $(CSRCS:.c=$(OBJEXT))
 
-SRCS		= $(ASRCS) $(CSRCS)
-OBJS		= $(AOBJS) $(COBJS)
+SRCS = $(ASRCS) $(CSRCS)
+OBJS = $(AOBJS) $(COBJS)
 
 ifeq ($(WINTOOL),y)
-  BIN		= "${shell cygpath -w  $(APPDIR)/libapps$(LIBEXT)}"
+  BIN = "${shell cygpath -w  $(APPDIR)/libapps$(LIBEXT)}"
 else
-  BIN		= "$(APPDIR)/libapps$(LIBEXT)"
+  BIN = "$(APPDIR)/libapps$(LIBEXT)"
 endif
 
-ROOTDEPPATH	= --dep-path .
+ROOTDEPPATH	= --dep-path . --dep-path tests
 
-# Common build
+# Build targets
 
-VPATH		= 
+VPATH = tests
 
 all: .built
-.PHONY: headers clean_tests clean depend disclean
+.PHONY: really_build clean_tests clean depend disclean
 
 $(AOBJS): %$(OBJEXT): %.S
 	$(call ASSEMBLE, $<, $@)
@@ -69,15 +69,21 @@ $(AOBJS): %$(OBJEXT): %.S
 $(COBJS): %$(OBJEXT): %.c
 	$(call COMPILE, $<, $@)
 
-headers:
-	@$(MAKE) -C tests TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)" CROSSDEV=$(CROSSDEV)
+# This is a little messy.  The build is broken into two pieces:  (1) the
+# tests/ subdir build that auto-generates several files, and (2) the real
+# build.  This is done because we need a fresh build context after auto-
+# generating the source files.
 
-.built: headers $(OBJS)
+really_build: $(OBJS)
 	@( for obj in $(OBJS) ; do \
 		$(call ARCHIVE, $(BIN), $${obj}); \
 	done ; )
 	@touch .built
 
+.built:
+	@$(MAKE) -C tests TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)" CROSSDEV=$(CROSSDEV)
+	@$(MAKE) TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)" really_build
+
 context:
 
 # We can't make dependencies in this directory because the required
diff --git a/apps/examples/elf/elf_main.c b/apps/examples/elf/elf_main.c
index 3a6eae9d9..23a6b2d21 100644
--- a/apps/examples/elf/elf_main.c
+++ b/apps/examples/elf/elf_main.c
@@ -52,10 +52,10 @@
 #include <nuttx/ramdisk.h>
 #include <nuttx/binfmt/binfmt.h>
 #include <nuttx/binfmt/elf.h>
+#include <nuttx/binfmt/symtab.h>
 
 #include "tests/romfs.h"
 #include "tests/dirlist.h"
-#include "tests/symtab.h"
 
 /****************************************************************************
  * Definitions
@@ -135,6 +135,13 @@ static const char delimiter[] =
 static char path[128];
 
 /****************************************************************************
+ * Symbols from Auto-Generated Code
+ ****************************************************************************/
+
+extern const struct symtab_s exports[];
+extern const int nexports;
+
+/****************************************************************************
  * Private Functions
  ****************************************************************************/
 
@@ -207,7 +214,7 @@ int elf_main(int argc, char *argv[])
 
       bin.filename = path;
       bin.exports  = exports;
-      bin.nexports = NEXPORTS;
+      bin.nexports = nexports;
 
       ret = load_module(&bin);
       if (ret < 0)
diff --git a/apps/examples/elf/tests/Makefile b/apps/examples/elf/tests/Makefile
index c4a0eec4c..f834f6c78 100644
--- a/apps/examples/elf/tests/Makefile
+++ b/apps/examples/elf/tests/Makefile
@@ -34,35 +34,53 @@
 ############################################################################
 
 # Most of these do no build yet
-SUBDIRS = errno hello hello++ longjmp mutex pthread signal task struct
+
+ALL_SUBDIRS = errno hello hello++ longjmp mutex pthread signal task struct
+BUILD_SUBDIRS = errno hello task struct
+
+ifeq ($(CONFIG_HAVE_CXX),y)
+BUILD_SUBDIRS += hello++
+endif
+
+ifeq ($(CONFIG_EXAMPLES_ELF_LONGJMP),y)
+BUILD_SUBDIRS += longjmp
+endif
+
+ifneq ($(CONFIG_DISABLE_PTHREAD),y)
+BUILD_SUBDIRS += mutex pthread
+endif
+
+ifneq ($(CONFIG_DISABLE_SIGNALS),y)
+BUILD_SUBDIRS += signal
+endif
 
 ELF_DIR = $(APPDIR)/examples/elf
 TESTS_DIR = $(ELF_DIR)/tests
 ROMFS_DIR = $(TESTS_DIR)/romfs
 ROMFS_IMG = $(TESTS_DIR)/romfs.img
 ROMFS_HDR = $(TESTS_DIR)/romfs.h
-ROMFS_DIRLIST = $(TESTS_DIR)/dirlist.h
-SYMTAB = $(TESTS_DIR)/symtab.h
+DIRLIST_HDR = $(TESTS_DIR)/dirlist.h
+SYMTAB_SRC = $(TESTS_DIR)/symtab.c
 
 define DIR_template
 $(1)_$(2):
 	@$(MAKE) -C $(1) $(3) TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)" ROMFS_DIR="$(ROMFS_DIR)" CROSSDEV=$(CROSSDEV)
 endef
 
-all: $(ROMFS_HDR) $(ROMFS_DIRLIST) $(SYMTAB)
+all: $(ROMFS_HDR) $(DIRLIST_HDR) $(SYMTAB_SRC)
 .PHONY: all build clean install populate
 
-$(foreach DIR, $(SUBDIRS), $(eval $(call DIR_template,$(DIR),build, all)))
-$(foreach DIR, $(SUBDIRS), $(eval $(call DIR_template,$(DIR),clean,clean)))
-$(foreach DIR, $(SUBDIRS), $(eval $(call DIR_template,$(DIR),install,install)))
+$(foreach DIR, $(BUILD_SUBDIRS), $(eval $(call DIR_template,$(DIR),build, all)))
+$(foreach DIR, $(ALL_SUBDIRS), $(eval $(call DIR_template,$(DIR),clean,clean)))
+$(foreach DIR, $(BUILD_SUBDIRS), $(eval $(call DIR_template,$(DIR),install,install)))
 
 # Build program(s) in each sud-directory 
 
-build: $(foreach DIR, $(SUBDIRS), $(DIR)_build)
+build: $(foreach DIR, $(BUILD_SUBDIRS), $(DIR)_build)
 
 # Install each program in the romfs directory
 
-install: $(foreach DIR, $(SUBDIRS), $(DIR)_install)
+install: $(foreach DIR, $(BUILD_SUBDIRS), $(DIR)_install)
 
 # Create the romfs directory
 
@@ -85,16 +103,16 @@ $(ROMFS_HDR) : $(ROMFS_IMG)
 
 # Create the dirlist.h header file from the romfs directory 
 
-$(ROMFS_DIRLIST) : populate
+$(DIRLIST_HDR) : populate
 	@$(TESTS_DIR)/mkdirlist.sh $(ROMFS_DIR) >$@
 
 # Create the exported symbol table list from the derived *-thunk.S files
 
-$(SYMTAB): build
-	@$(TESTS_DIR)/mksymtab.sh $(TESTS_DIR) >$@
+$(SYMTAB_SRC): build
+	@$(TESTS_DIR)/mksymtab.sh -t varlist.tmp $(ROMFS_DIR) >$@
 
 # Clean each subdirectory
 
-clean: $(foreach DIR, $(SUBDIRS), $(DIR)_clean)
-	@rm -f $(ROMFS_HDR) $(ROMFS_IMG) $(SYMTAB)
+clean: $(foreach DIR, $(ALL_SUBDIRS), $(DIR)_clean)
+	@rm -f $(ROMFS_HDR) $(ROMFS_IMG) $(SYMTAB_SRC) varlist.tmp
 	@rm -rf $(ROMFS_DIR)
diff --git a/apps/examples/elf/tests/errno/Makefile b/apps/examples/elf/tests/errno/Makefile
index 3c299b16d..92cff9e12 100644
--- a/apps/examples/elf/tests/errno/Makefile
+++ b/apps/examples/elf/tests/errno/Makefile
@@ -45,7 +45,7 @@ all: $(BIN)
 
 $(OBJS): %.o: %.c
 	@echo "CC: $<"
-	@$(CC) -c $(CFLAGS) $< -o $@
+	@$(CC) -c $(CELFFLAGS) $< -o $@
 
 $(BIN): $(OBJS)
 	@echo "LD: $<"
diff --git a/apps/examples/elf/tests/hello/Makefile b/apps/examples/elf/tests/hello/Makefile
index c3a3dacaf..e1c396c3c 100644
--- a/apps/examples/elf/tests/hello/Makefile
+++ b/apps/examples/elf/tests/hello/Makefile
@@ -45,7 +45,7 @@ all: $(BIN)
 
 $(OBJS): %.o: %.c
 	@echo "CC: $<"
-	@$(CC) -c $(CFLAGS) $< -o $@
+	@$(CC) -c $(CELFFLAGS) $< -o $@
 
 $(BIN): $(OBJS)
 	@echo "LD: $<"
diff --git a/apps/examples/elf/tests/longjmp/Makefile b/apps/examples/elf/tests/longjmp/Makefile
index d737718e0..0cafe05e3 100644
--- a/apps/examples/elf/tests/longjmp/Makefile
+++ b/apps/examples/elf/tests/longjmp/Makefile
@@ -45,7 +45,7 @@ all: $(BIN)
 
 $(OBJS): %.o: %.c
 	@echo "CC: $<"
-	@$(CC) -c $(CFLAGS) $< -o $@
+	@$(CC) -c $(CELFFLAGS) $< -o $@
 
 $(BIN): $(OBJS)
 	@echo "LD: $<"
diff --git a/apps/examples/elf/tests/mksymtab.sh b/apps/examples/elf/tests/mksymtab.sh
index fa1a2d030..56be10f73 100755
--- a/apps/examples/elf/tests/mksymtab.sh
+++ b/apps/examples/elf/tests/mksymtab.sh
@@ -1,6 +1,24 @@
 #!/bin/bash
 
-usage="Usage: %0 <test-dir-path>"
+usage="Usage: $0 [-t <tmp-file>] <test-dir-path>"
+
+# Check for the optional tempory file name
+
+tmpfile=varlist.tmp
+if [ "X${1}" = "X-t" ]; then
+	shift
+	tmpfile=$1
+	shift
+
+	if [ -z "$tmpfile" ]; then
+		echo "ERROR: Missing <tmpfile>"
+		echo ""
+		echo $usage
+		exit 1
+	fi
+fi
+
+# Check for the required ROMFS directory path
 
 dir=$1
 if [ -z "$dir" ]; then
@@ -17,23 +35,33 @@ if [ ! -d "$dir" ]; then
 	exit 1
 fi
 
-varlist=`find $dir -name "*-thunk.S"| xargs grep -h asciz | cut -f3 | sort | uniq`
+# Extract all of the undefined symbols from the ELF files and create a
+# list of sorted, unique undefined variable names.
 
-echo "#ifndef __EXAMPLES_ELF_TESTS_SYMTAB_H"
-echo "#define __EXAMPLES_ELF_TESTS_SYMTAB_H"
-echo ""
+varlist=`find ${dir} -executable -type f | xargs nm | fgrep ' U ' | sed -e "s/^[ ]*//g" | cut -d' ' -f2 | sort | uniq`
+
+# Now output the symbol table as a structure in a C source file.  All
+# undefined symbols are declared as void* types.  If the toolchain does
+# any kind of checking for function vs. data objects, then this could
+# faile
+
+echo "#include <nuttx/compiler.h>"
 echo "#include <nuttx/binfmt/symtab.h>"
 echo ""
-echo "static const struct symtab_s exports[] = "
+
+for var in $varlist; do
+	echo "extern void *${var};"
+done
+
+echo ""
+echo "const struct symtab_s exports[] = "
 echo "{"
 
-for string in $varlist; do
-	var=`echo $string | sed -e "s/\"//g"`
-	echo "  {$string, $var},"
+for var in $varlist; do
+	echo "  {\"${var}\", &${var}},"
 done
 
 echo "};"
-echo "#define NEXPORTS (sizeof(exports)/sizeof(struct symtab_s))"
 echo ""
-echo "#endif /* __EXAMPLES_ELF_TESTS_SYMTAB_H */"
+echo "const int nexports = sizeof(exports) / sizeof(struct symtab_s);"
 
diff --git a/apps/examples/elf/tests/mutex/Makefile b/apps/examples/elf/tests/mutex/Makefile
index 7f0a5493e..efce216d8 100644
--- a/apps/examples/elf/tests/mutex/Makefile
+++ b/apps/examples/elf/tests/mutex/Makefile
@@ -45,7 +45,7 @@ all: $(BIN)
 
 $(OBJS): %.o: %.c
 	@echo "CC: $<"
-	@$(CC) -c $(CFLAGS) $< -o $@
+	@$(CC) -c $(CELFFLAGS) $< -o $@
 
 $(BIN): $(OBJS)
 	@echo "LD: $<"
diff --git a/apps/examples/elf/tests/pthread/Makefile b/apps/examples/elf/tests/pthread/Makefile
index 8db290e6e..134fabe01 100644
--- a/apps/examples/elf/tests/pthread/Makefile
+++ b/apps/examples/elf/tests/pthread/Makefile
@@ -45,7 +45,7 @@ all: $(BIN)
 
 $(OBJS): %.o: %.c
 	@echo "CC: $<"
-	@$(CC) -c $(CFLAGS) $< -o $@
+	@$(CC) -c $(CELFFLAGS) $< -o $@
 
 $(BIN): $(OBJS)
 	@echo "LD: $<"
diff --git a/apps/examples/elf/tests/signal/Makefile b/apps/examples/elf/tests/signal/Makefile
index 4338aa48d..08710aeaa 100644
--- a/apps/examples/elf/tests/signal/Makefile
+++ b/apps/examples/elf/tests/signal/Makefile
@@ -45,7 +45,7 @@ all: $(BIN)
 
 $(OBJS): %.o: %.c
 	@echo "CC: $<"
-	@$(CC) -c $(CFLAGS) $< -o $@
+	@$(CC) -c $(CELFFLAGS) $< -o $@
 
 $(BIN): $(OBJS)
 	@echo "LD: $<"
diff --git a/apps/examples/elf/tests/signal/signal.c b/apps/examples/elf/tests/signal/signal.c
index 0d2e9e6cc..b40da7a86 100644
--- a/apps/examples/elf/tests/signal/signal.c
+++ b/apps/examples/elf/tests/signal/signal.c
@@ -38,6 +38,7 @@
  ****************************************************************************/
 
 #include <sys/types.h>
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <signal.h>
@@ -66,22 +67,7 @@ static int sigusr2_rcvd = 0;
  ****************************************************************************/
 
 /****************************************************************************
- * Name: sigusr1_sighandler
- ****************************************************************************/
-
-/* NOTE: it is necessary for functions that are referred to by function pointers
- * pointer to be declared with global scope (at least for ARM).  Otherwise,
- * a relocation type that is not supported by ELF is generated by GCC.
- */
-
-void sigusr1_sighandler(int signo)
-{
-  printf("sigusr1_sighandler: Received SIGUSR1, signo=%d\n", signo);
-  sigusr1_rcvd = 1;
-}
-
-/****************************************************************************
- * Name: sigusr2_sigaction
+ * Name: siguser_action
  ***************************************************************************/
 
 /* NOTE: it is necessary for functions that are referred to by function pointers
@@ -89,50 +75,33 @@ void sigusr1_sighandler(int signo)
  * a relocation type that is not supported by ELF is generated by GCC.
  */
 
-#ifdef __USE_POSIX199309
-void sigusr2_sigaction(int signo, siginfo_t *siginfo, void *arg)
+void siguser_action(int signo, siginfo_t *siginfo, void *arg)
 {
-  printf("sigusr2_sigaction: Received SIGUSR2, signo=%d siginfo=%p arg=%p\n",
+  printf("siguser_action: Received signo=%d siginfo=%p arg=%p\n",
          signo, siginfo, arg);
 
-#ifdef HAVE_SIGQUEUE
+  if (signo == SIGUSR1)
+    {
+      printf("  SIGUSR1 received\n");
+      sigusr2_rcvd = 1;
+    }
+  else if (signo == SIGUSR2)
+    {
+      printf("  SIGUSR2 received\n");
+      sigusr1_rcvd = 2;
+    }
+  else
+    {
+      printf("  ERROR: Unexpected signal\n");
+    }
+
   if (siginfo)
     {
+      printf("siginfo:\n");
       printf("  si_signo  = %d\n",  siginfo->si_signo);
-      printf("  si_errno  = %d\n",  siginfo->si_errno);
       printf("  si_code   = %d\n",  siginfo->si_code);
-      printf("  si_pid    = %d\n",  siginfo->si_pid);
-      printf("  si_uid    = %d\n",  siginfo->si_uid);
-      printf("  si_status = %d\n",  siginfo->si_status);
-      printf("  si_utime  = %ld\n", (long)siginfo->si_utime);
-      printf("  si_stime  = %ld\n", (long)siginfo->si_stime);
       printf("  si_value  = %d\n",  siginfo->si_value.sival_int);
-      printf("  si_int    = %d\n",  siginfo->si_int);
-      printf("  si_ptr    = %p\n",  siginfo->si_ptr);
-      printf("  si_addr   = %p\n",  siginfo->si_addr);
-      printf("  si_band   = %ld\n",  siginfo->si_band);
-      printf("  si_fd     = %d\n",  siginfo->si_fd);
     }
-#endif
-  sigusr2_rcvd = 1;
-}
-#else
-void sigusr2_sigaction(int signo)
-{
-  printf("sigusr2_sigaction: Received SIGUSR2, signo=%d\n", signo);
-  sigusr2_rcvd = 1;
-}
-
-#endif
-
-/****************************************************************************
- * Name: sigusr2_sighandler
- ****************************************************************************/
-
-static void sigusr2_sighandler(int signo)
-{
-  printf("sigusr2_sighandler: Received SIGUSR2, signo=%d\n", signo);
-  sigusr2_rcvd = 1;
 }
 
 /****************************************************************************
@@ -146,39 +115,36 @@ static void sigusr2_sighandler(int signo)
 int main(int argc, char **argv)
 {
   struct sigaction act;
-  struct sigaction oact;
-  void (*old_sigusr1_sighandler)(int signo);
-  void (*old_sigusr2_sighandler)(int signo);
+  struct sigaction oact1;
+  struct sigaction oact2;
   pid_t mypid = getpid();
-#if defined(__USE_POSIX199309) && defined(HAVE_SIGQUEUE)
-  sigval_t sigval;
-#endif
+  union sigval sigval;
   int status;
 
   printf("Setting up signal handlers from pid=%d\n", mypid);
 
-  /* Set up so that sigusr1_sighandler will respond to SIGUSR1 */
+  /* Set up so that siguser_action will respond to SIGUSR1 */
 
-  old_sigusr1_sighandler = signal(SIGUSR1, sigusr1_sighandler);
-  if (old_sigusr1_sighandler == SIG_ERR)
+  memset(&act, 0, sizeof(struct sigaction));
+  act.sa_sigaction = siguser_action;
+  act.sa_flags     = SA_SIGINFO;
+
+  (void)sigemptyset(&act.sa_mask);
+
+  status = sigaction(SIGUSR1, &act, &oact1);
+  if (status != 0)
     {
       fprintf(stderr, "Failed to install SIGUSR1 handler, errno=%d\n",
               errno);
-      exit(1);
+      exit(2);
     }
 
-  printf("Old SIGUSR1 sighandler at %p\n", old_sigusr1_sighandler);
-  printf("New SIGUSR1 sighandler at %p\n", sigusr1_sighandler);
-
-  /* Set up so that sigusr2_sigaction will respond to SIGUSR2 */
-
-  memset(&act, 0, sizeof(struct sigaction));
-  act.sa_sigaction = sigusr2_sigaction;
-  act.sa_flags     = SA_SIGINFO;
+  printf("Old SIGUSR1 sighandler at %p\n", oact1.sa_handler);
+  printf("New SIGUSR1 sighandler at %p\n", siguser_action);
 
-  (void)sigemptyset(&act.sa_mask);
+  /* Set up so that siguser_action will respond to SIGUSR2 */
 
-  status = sigaction(SIGUSR2, &act, &oact);
+  status = sigaction(SIGUSR2, &act, &oact2);
   if (status != 0)
     {
       fprintf(stderr, "Failed to install SIGUSR2 handler, errno=%d\n",
@@ -186,18 +152,19 @@ int main(int argc, char **argv)
       exit(2);
     }
 
-  printf("Old SIGUSR2 sighandler at %p\n", oact.sa_handler);
-  printf("New SIGUSR2 sighandler at %p\n", sigusr2_sigaction);
-  printf("Raising SIGUSR1 from pid=%d\n", mypid);
+  printf("Old SIGUSR2 sighandler at %p\n", oact2.sa_handler);
+  printf("New SIGUSR2 sighandler at %p\n", siguser_action);
+  printf("Raising SIGUSR1 from pid=%d\n",  mypid);
 
   fflush(stdout); usleep(SHORT_DELAY);
 
-  /* Send SIGUSR1 to ourselves via raise() */
+  /* Send SIGUSR1 to ourselves via kill() */
 
-  status = raise(SIGUSR1);
+  printf("Kill-ing SIGUSR1 from pid=%d\n", mypid);
+  status = kill(0, SIGUSR1);
   if (status != 0)
     {
-      fprintf(stderr, "Failed to raise SIGUSR1, errno=%d\n", errno);
+      fprintf(stderr, "Failed to kill SIGUSR1, errno=%d\n", errno);
       exit(3);
     }
 
@@ -211,14 +178,14 @@ int main(int argc, char **argv)
       fprintf(stderr, "SIGUSR1 not received\n");
       exit(4);
     }
+
   sigusr1_rcvd = 0;
 
   /* Send SIGUSR2 to ourselves */
 
-  printf("Killing SIGUSR2 from pid=%d\n", mypid);
+  printf("sigqueue-ing SIGUSR2 from pid=%d\n", mypid);
   fflush(stdout); usleep(SHORT_DELAY);
 
-#if defined(__USE_POSIX199309) && defined(HAVE_SIGQUEUE)
   /* Send SIGUSR2 to ourselves via sigqueue() */
 
   sigval.sival_int = 87;
@@ -230,20 +197,8 @@ int main(int argc, char **argv)
     }
 
   usleep(SHORT_DELAY);
-  printf("SIGUSR2 queued from pid=%d, sigval=97\n", mypid);
-#else
-  /* Send SIGUSR2 to ourselves via kill() */
-
-  status = kill(mypid, SIGUSR2);
-  if (status != 0)
-    {
-      fprintf(stderr, "Failed to kill SIGUSR2, errno=%d\n", errno);
-      exit(5);
-    }
+  printf("SIGUSR2 queued from pid=%d, sigval=87\n", mypid);
 
-  usleep(SHORT_DELAY);
-  printf("SIGUSR2 killed from pid=%d\n", mypid);
-#endif
   /* Verify that SIGUSR2 was received */
 
   if (sigusr2_rcvd == 0)
@@ -251,32 +206,33 @@ int main(int argc, char **argv)
       fprintf(stderr, "SIGUSR2 not received\n");
       exit(6);
     }
+
   sigusr2_rcvd = 0;
 
-  /* Remove the sigusr2_sigaction handler and replace the SIGUSR2
+  /* Remove the siguser_action handler and replace the SIGUSR2
    * handler with sigusr2_sighandler.
    */
 
   printf("Resetting SIGUSR2 signal handler from pid=%d\n", mypid);
 
-  old_sigusr2_sighandler = signal(SIGUSR2, sigusr2_sighandler);
-  if (old_sigusr2_sighandler == SIG_ERR)
+  status = sigaction(SIGUSR2, &oact2, &act);
+  if (status != 0)
     {
-      fprintf(stderr, "Failed to install SIGUSR2 handler, errno=%d\n",
+      fprintf(stderr, "Failed to install SIGUSR1 handler, errno=%d\n",
               errno);
-      exit(7);
+      exit(2);
     }
 
-  printf("Old SIGUSR2 sighandler at %p\n", old_sigusr2_sighandler);
-  printf("New SIGUSR2 sighandler at %p\n", sigusr2_sighandler);
+  printf("Old SIGUSR1 sighandler at %p\n", act.sa_handler);
+  printf("New SIGUSR1 sighandler at %p\n", oact1.sa_handler);
 
-  /* Verify that the handler that was removed was sigusr2_sigaction */
+  /* Verify that the handler that was removed was siguser_action */
 
-  if ((void*)old_sigusr2_sighandler != (void*)sigusr2_sigaction)
+  if ((void*)act.sa_handler != (void*)siguser_action)
     {
       fprintf(stderr,
-              "Old SIGUSR2 signhanlder (%p) is not sigusr2_sigation (%p)\n",
-              old_sigusr2_sighandler, sigusr2_sigaction);
+              "Old SIGUSR2 signal handler (%p) is not siguser_action (%p)\n",
+              act.sa_handler, siguser_action);
       exit(8);
     }
 
@@ -302,6 +258,7 @@ int main(int argc, char **argv)
       fprintf(stderr, "SIGUSR2 not received\n");
       exit(10);
     }
+
   sigusr2_rcvd = 0;
 
   return 0;
diff --git a/apps/examples/elf/tests/struct/Makefile b/apps/examples/elf/tests/struct/Makefile
index c15d8fc47..3aa0e4a57 100644
--- a/apps/examples/elf/tests/struct/Makefile
+++ b/apps/examples/elf/tests/struct/Makefile
@@ -36,7 +36,7 @@
 -include $(TOPDIR)/.config
 -include $(TOPDIR)/Make.defs
 
-CFLAGS += -I.
+CELFFLAGS += -I.
 
 BIN  = struct
 SRCS = struct_main.c struct_dummy.c
@@ -46,7 +46,7 @@ all: $(BIN)
 
 $(OBJS): %.o: %.c
 	@echo "CC: $<"
-	@$(CC) -c $(CFLAGS) $< -o $@
+	@$(CC) -c $(CELFFLAGS) $< -o $@
 
 $(BIN): $(OBJS)
 	@echo "LD: $<"
diff --git a/apps/examples/elf/tests/task/Makefile b/apps/examples/elf/tests/task/Makefile
index 208b228b3..63a2eb211 100644
--- a/apps/examples/elf/tests/task/Makefile
+++ b/apps/examples/elf/tests/task/Makefile
@@ -45,7 +45,7 @@ all: $(BIN)
 
 $(OBJS): %.o: %.c
 	@echo "CC: $<"
-	@$(CC) -c $(CFLAGS) $< -o $@
+	@$(CC) -c $(CELFFLAGS) $< -o $@
 
 $(BIN): $(OBJS)
 	@echo "LD: $<"
diff --git a/apps/examples/nxflat/tests/mksymtab.sh b/apps/examples/nxflat/tests/mksymtab.sh
index 4b5347f17..27abc4b41 100755
--- a/apps/examples/nxflat/tests/mksymtab.sh
+++ b/apps/examples/nxflat/tests/mksymtab.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-usage="Usage: %0 <test-dir-path>"
+usage="Usage: $0 <test-dir-path>"
 
 dir=$1
 if [ -z "$dir" ]; then
diff --git a/apps/examples/nxflat/tests/signal/signal.c b/apps/examples/nxflat/tests/signal/signal.c
index 2df5baaa2..c5ea6bdcc 100644
--- a/apps/examples/nxflat/tests/signal/signal.c
+++ b/apps/examples/nxflat/tests/signal/signal.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * examples/nxflat/tests/signal/signal.c
  *
- *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009, 2012 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -67,73 +67,41 @@ static int sigusr2_rcvd = 0;
  ****************************************************************************/
 
 /****************************************************************************
- * Name: sigusr1_sighandler
- ****************************************************************************/
-
-/* NOTE: it is necessary for functions that are referred to by function pointers
- * pointer to be declared with global scope (at least for ARM).  Otherwise,
- * a relocation type that is not supported by NXFLAT is generated by GCC.
- */
-
-void sigusr1_sighandler(int signo)
-{
-  printf("sigusr1_sighandler: Received SIGUSR1, signo=%d\n", signo);
-  sigusr1_rcvd = 1;
-}
-
-/****************************************************************************
- * Name: sigusr2_sigaction
+ * Name: siguser_action
  ***************************************************************************/
 
 /* NOTE: it is necessary for functions that are referred to by function pointers
  *  pointer to be declared with global scope (at least for ARM).  Otherwise,
- * a relocation type that is not supported by NXFLAT is generated by GCC.
+ * a relocation type that is not supported by ELF is generated by GCC.
  */
 
-#ifdef __USE_POSIX199309
-void sigusr2_sigaction(int signo, siginfo_t *siginfo, void *arg)
+void siguser_action(int signo, siginfo_t *siginfo, void *arg)
 {
-  printf("sigusr2_sigaction: Received SIGUSR2, signo=%d siginfo=%p arg=%p\n",
+  printf("siguser_action: Received signo=%d siginfo=%p arg=%p\n",
          signo, siginfo, arg);
 
-#ifdef HAVE_SIGQUEUE
+  if (signo == SIGUSR1)
+    {
+      printf("  SIGUSR1 received\n");
+      sigusr2_rcvd = 1;
+    }
+  else if (signo == SIGUSR2)
+    {
+      printf("  SIGUSR2 received\n");
+      sigusr1_rcvd = 2;
+    }
+  else
+    {
+      printf("  ERROR: Unexpected signal\n");
+    }
+
   if (siginfo)
     {
+      printf("siginfo:\n");
       printf("  si_signo  = %d\n",  siginfo->si_signo);
-      printf("  si_errno  = %d\n",  siginfo->si_errno);
       printf("  si_code   = %d\n",  siginfo->si_code);
-      printf("  si_pid    = %d\n",  siginfo->si_pid);
-      printf("  si_uid    = %d\n",  siginfo->si_uid);
-      printf("  si_status = %d\n",  siginfo->si_status);
-      printf("  si_utime  = %ld\n", (long)siginfo->si_utime);
-      printf("  si_stime  = %ld\n", (long)siginfo->si_stime);
       printf("  si_value  = %d\n",  siginfo->si_value.sival_int);
-      printf("  si_int    = %d\n",  siginfo->si_int);
-      printf("  si_ptr    = %p\n",  siginfo->si_ptr);
-      printf("  si_addr   = %p\n",  siginfo->si_addr);
-      printf("  si_band   = %ld\n",  siginfo->si_band);
-      printf("  si_fd     = %d\n",  siginfo->si_fd);
     }
-#endif
-  sigusr2_rcvd = 1;
-}
-#else
-void sigusr2_sigaction(int signo)
-{
-  printf("sigusr2_sigaction: Received SIGUSR2, signo=%d\n", signo);
-  sigusr2_rcvd = 1;
-}
-
-#endif
-
-/****************************************************************************
- * Name: sigusr2_sighandler
- ****************************************************************************/
-
-static void sigusr2_sighandler(int signo)
-{
-  printf("sigusr2_sighandler: Received SIGUSR2, signo=%d\n", signo);
-  sigusr2_rcvd = 1;
 }
 
 /****************************************************************************
@@ -147,39 +115,36 @@ static void sigusr2_sighandler(int signo)
 int main(int argc, char **argv)
 {
   struct sigaction act;
-  struct sigaction oact;
-  void (*old_sigusr1_sighandler)(int signo);
-  void (*old_sigusr2_sighandler)(int signo);
+  struct sigaction oact1;
+  struct sigaction oact2;
   pid_t mypid = getpid();
-#if defined(__USE_POSIX199309) && defined(HAVE_SIGQUEUE)
-  sigval_t sigval;
-#endif
+  union sigval sigval;
   int status;
 
   printf("Setting up signal handlers from pid=%d\n", mypid);
 
-  /* Set up so that sigusr1_sighandler will respond to SIGUSR1 */
+  /* Set up so that siguser_action will respond to SIGUSR1 */
+
+  memset(&act, 0, sizeof(struct sigaction));
+  act.sa_sigaction = siguser_action;
+  act.sa_flags     = SA_SIGINFO;
 
-  old_sigusr1_sighandler = signal(SIGUSR1, sigusr1_sighandler);
-  if (old_sigusr1_sighandler == SIG_ERR)
+  (void)sigemptyset(&act.sa_mask);
+
+  status = sigaction(SIGUSR1, &act, &oact1);
+  if (status != 0)
     {
       fprintf(stderr, "Failed to install SIGUSR1 handler, errno=%d\n",
               errno);
-      exit(1);
+      exit(2);
     }
 
-  printf("Old SIGUSR1 sighandler at %p\n", old_sigusr1_sighandler);
-  printf("New SIGUSR1 sighandler at %p\n", sigusr1_sighandler);
-
-  /* Set up so that sigusr2_sigaction will respond to SIGUSR2 */
-
-  memset(&act, 0, sizeof(struct sigaction));
-  act.sa_sigaction = sigusr2_sigaction;
-  act.sa_flags     = SA_SIGINFO;
+  printf("Old SIGUSR1 sighandler at %p\n", oact1.sa_handler);
+  printf("New SIGUSR1 sighandler at %p\n", siguser_action);
 
-  (void)sigemptyset(&act.sa_mask);
+  /* Set up so that siguser_action will respond to SIGUSR2 */
 
-  status = sigaction(SIGUSR2, &act, &oact);
+  status = sigaction(SIGUSR2, &act, &oact2);
   if (status != 0)
     {
       fprintf(stderr, "Failed to install SIGUSR2 handler, errno=%d\n",
@@ -187,18 +152,19 @@ int main(int argc, char **argv)
       exit(2);
     }
 
-  printf("Old SIGUSR2 sighandler at %p\n", oact.sa_handler);
-  printf("New SIGUSR2 sighandler at %p\n", sigusr2_sigaction);
-  printf("Raising SIGUSR1 from pid=%d\n", mypid);
+  printf("Old SIGUSR2 sighandler at %p\n", oact2.sa_handler);
+  printf("New SIGUSR2 sighandler at %p\n", siguser_action);
+  printf("Raising SIGUSR1 from pid=%d\n",  mypid);
 
   fflush(stdout); usleep(SHORT_DELAY);
 
-  /* Send SIGUSR1 to ourselves via raise() */
+  /* Send SIGUSR1 to ourselves via kill() */
 
-  status = raise(SIGUSR1);
+  printf("Kill-ing SIGUSR1 from pid=%d\n", mypid);
+  status = kill(0, SIGUSR1);
   if (status != 0)
     {
-      fprintf(stderr, "Failed to raise SIGUSR1, errno=%d\n", errno);
+      fprintf(stderr, "Failed to kill SIGUSR1, errno=%d\n", errno);
       exit(3);
     }
 
@@ -212,14 +178,14 @@ int main(int argc, char **argv)
       fprintf(stderr, "SIGUSR1 not received\n");
       exit(4);
     }
+
   sigusr1_rcvd = 0;
 
   /* Send SIGUSR2 to ourselves */
 
-  printf("Killing SIGUSR2 from pid=%d\n", mypid);
+  printf("sigqueue-ing SIGUSR2 from pid=%d\n", mypid);
   fflush(stdout); usleep(SHORT_DELAY);
 
-#if defined(__USE_POSIX199309) && defined(HAVE_SIGQUEUE)
   /* Send SIGUSR2 to ourselves via sigqueue() */
 
   sigval.sival_int = 87;
@@ -231,20 +197,8 @@ int main(int argc, char **argv)
     }
 
   usleep(SHORT_DELAY);
-  printf("SIGUSR2 queued from pid=%d, sigval=97\n", mypid);
-#else
-  /* Send SIGUSR2 to ourselves via kill() */
+  printf("SIGUSR2 queued from pid=%d, sigval=87\n", mypid);
 
-  status = kill(mypid, SIGUSR2);
-  if (status != 0)
-    {
-      fprintf(stderr, "Failed to kill SIGUSR2, errno=%d\n", errno);
-      exit(5);
-    }
-
-  usleep(SHORT_DELAY);
-  printf("SIGUSR2 killed from pid=%d\n", mypid);
-#endif
   /* Verify that SIGUSR2 was received */
 
   if (sigusr2_rcvd == 0)
@@ -252,32 +206,33 @@ int main(int argc, char **argv)
       fprintf(stderr, "SIGUSR2 not received\n");
       exit(6);
     }
+
   sigusr2_rcvd = 0;
 
-  /* Remove the sigusr2_sigaction handler and replace the SIGUSR2
+  /* Remove the siguser_action handler and replace the SIGUSR2
    * handler with sigusr2_sighandler.
    */
 
   printf("Resetting SIGUSR2 signal handler from pid=%d\n", mypid);
 
-  old_sigusr2_sighandler = signal(SIGUSR2, sigusr2_sighandler);
-  if (old_sigusr2_sighandler == SIG_ERR)
+  status = sigaction(SIGUSR2, &oact2, &act);
+  if (status != 0)
     {
-      fprintf(stderr, "Failed to install SIGUSR2 handler, errno=%d\n",
+      fprintf(stderr, "Failed to install SIGUSR1 handler, errno=%d\n",
               errno);
-      exit(7);
+      exit(2);
     }
 
-  printf("Old SIGUSR2 sighandler at %p\n", old_sigusr2_sighandler);
-  printf("New SIGUSR2 sighandler at %p\n", sigusr2_sighandler);
+  printf("Old SIGUSR1 sighandler at %p\n", act.sa_handler);
+  printf("New SIGUSR1 sighandler at %p\n", oact1.sa_handler);
 
-  /* Verify that the handler that was removed was sigusr2_sigaction */
+  /* Verify that the handler that was removed was siguser_action */
 
-  if ((void*)old_sigusr2_sighandler != (void*)sigusr2_sigaction)
+  if ((void*)act.sa_handler != (void*)siguser_action)
     {
       fprintf(stderr,
-              "Old SIGUSR2 signhanlder (%p) is not sigusr2_sigation (%p)\n",
-              old_sigusr2_sighandler, sigusr2_sigaction);
+              "Old SIGUSR2 signal handler (%p) is not siguser_action (%p)\n",
+              act.sa_handler, siguser_action);
       exit(8);
     }
 
@@ -303,6 +258,7 @@ int main(int argc, char **argv)
       fprintf(stderr, "SIGUSR2 not received\n");
       exit(10);
     }
+
   sigusr2_rcvd = 0;
 
   return 0;