More ELF loader changes

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5261 42af7a65-404d-4744-a932-0658087f49c3

apps/examples/README.txt

@@ -297,6 +297,53 @@ examples/discover
     CONFIG_EXAMPLES_DISCOVER_DRIPADDR - Router IP address
     CONFIG_EXAMPLES_DISCOVER_NETMASK - Network Mask
 
+examples/elf
+^^^^^^^^^^^^
+
+  This example builds a small ELF loader test case.  This includes several
+  test programs under examples/elf tests.  These tests are build using
+  the relocatable ELF format and installed in a ROMFS file system.  At run time,
+  each program in the ROMFS file system is executed.  Requires CONFIG_ELF.
+  Other configuration options:
+
+    CONFIG_EXAMPLES_ELF_DEVMINOR - The minor device number of the ROMFS block.
+      For example, the N in /dev/ramN. Used for registering the RAM block driver
+      that will hold the ROMFS file system containing the ELF executables to be
+      tested.  Default: 0
+
+    CONFIG_EXAMPLES_ELF_DEVPATH - The path to the ROMFS block driver device.  This
+      must match EXAMPLES_ELF_DEVMINOR. Used for registering the RAM block driver
+      that will hold the ROMFS file system containing the ELF executables to be
+      tested.  Default: "/dev/ram0"
+
+  NOTES:
+
+  1. Your top-level nuttx/Make.defs file must 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).
+
+       LDELFFLAGS = -r -e main
+
+     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
+     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
+     because they include a lot of "build garbage".  You can greately 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
+     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.
+
 examples/ftpc
 ^^^^^^^^^^^^^
 

apps/examples/elf/Kconfig

@@ -10,4 +10,20 @@ config EXAMPLES_ELF
 		Enable the ELF loader example
 
 if EXAMPLES_ELF
+config EXAMPLES_ELF_DEVMINOR
+	int "ROMFS Minor Device Number"
+	default 0
+	---help---
+		The minor device number of the ROMFS block. For example, the N in /dev/ramN.
+		Used for registering the RAM block driver that will hold the ROMFS file system
+		containing the ELF executables to be tested.  Default: 0
+
+config EXAMPLES_ELF_DEVPATH
+	string "ROMFS Devie Path"
+	default "/dev/ram0"
+	---help---
+		The path to the ROMFS block driver device.  This must match EXAMPLES_ELF_DEVMINOR.
+		Used for registering the RAM block driver that will hold the ROMFS file system
+		containing the ELF executables to be tested.  Default: "/dev/ram0"
+
 endif

apps/examples/elf/Makefile

@@ -61,7 +61,7 @@ ROOTDEPPATH	= --dep-path .
 VPATH		= 
 
 all: .built
-.PHONY: headers clean depend disclean
+.PHONY: headers clean_tests clean depend disclean
 
 $(AOBJS): %$(OBJEXT): %.S
 	$(call ASSEMBLE, $<, $@)
@@ -72,7 +72,7 @@ $(COBJS): %$(OBJEXT): %.c
 headers:
 	@$(MAKE) -C tests TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)" CROSSDEV=$(CROSSDEV)
 
-.built: $(OBJS)
+.built: headers $(OBJS)
 	@( for obj in $(OBJS) ; do \
 		$(call ARCHIVE, $(BIN), $${obj}); \
 	done ; )
@@ -88,7 +88,10 @@ context:
 
 depend: .depend
 
-clean:
+clean_tests:
+	@$(MAKE) -C tests TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)" CROSSDEV=$(CROSSDEV) clean
+
+clean: clean_tests
 	@rm -f *.o *~ .*.swp .built
 	$(call CLEAN)
 

apps/examples/elf/elf_main.c

@@ -89,9 +89,16 @@
 
 #define SECTORSIZE   512
 #define NSECTORS(b)  (((b)+SECTORSIZE-1)/SECTORSIZE)
-#define ROMFSDEV     "/dev/ram0"
 #define MOUNTPT      "/mnt/romfs"
 
+#ifndef CONFIG_EXAMPLES_ELF_DEVMINOR
+#  define CONFIG_EXAMPLES_ELF_DEVMINOR 0
+#endif
+
+#ifndef CONFIG_EXAMPLES_ELF_DEVPATH
+#  define CONFIG_EXAMPLES_ELF_DEVPATH "/dev/ram0"
+#endif
+
 /* If CONFIG_DEBUG is enabled, use dbg instead of printf so that the
  * output will be synchronous with the debug output.
  */
@@ -166,8 +173,9 @@ int elf_main(int argc, char *argv[])
 
   /* Create a ROM disk for the ROMFS filesystem */
 
-  message("Registering romdisk\n");
+  message("Registering romdisk at /dev/ram%d\n", CONFIG_EXAMPLES_ELF_DEVMINOR);
-  ret = romdisk_register(0, romfs_img, NSECTORS(romfs_img_len), SECTORSIZE);
+  ret = romdisk_register(CONFIG_EXAMPLES_ELF_DEVMINOR, romfs_img,
+                         NSECTORS(romfs_img_len), SECTORSIZE);
   if (ret < 0)
     {
       err("ERROR: romdisk_register failed: %d\n", ret);
@@ -178,13 +186,13 @@ int elf_main(int argc, char *argv[])
   /* Mount the file system */
 
   message("Mounting ROMFS filesystem at target=%s with source=%s\n",
-         MOUNTPT, ROMFSDEV);
+         MOUNTPT, CONFIG_EXAMPLES_ELF_DEVPATH);
 
-  ret = mount(ROMFSDEV, MOUNTPT, "romfs", MS_RDONLY, NULL);
+  ret = mount(CONFIG_EXAMPLES_ELF_DEVPATH, MOUNTPT, "romfs", MS_RDONLY, NULL);
   if (ret < 0)
     {
       err("ERROR: mount(%s,%s,romfs) failed: %s\n",
-              ROMFSDEV, MOUNTPT, errno);
+              CONFIG_EXAMPLES_ELF_DEVPATH, MOUNTPT, errno);
       elf_uninitialize();
     }
 
@@ -219,6 +227,6 @@ int elf_main(int argc, char *argv[])
       sleep(4);
     }
 
-  message("End-of-Test.. Exit-ing\n");
+  message("End-of-Test.. Exiting\n");
   return 0;
 }

apps/examples/elf/tests/errno/Makefile

@@ -39,7 +39,7 @@
 BIN = errno
 
 SRCS = $(BIN).c
-OBJS = $(BIN:.c=.o)
+OBJS = $(SRCS:.c=.o)
 
 all: $(BIN)
 

apps/examples/elf/tests/hello++/Makefile

@@ -64,7 +64,7 @@ all: $(BIN1) $(BIN2) $(BIN3) $(BIN4)
 
 $(OBJS): %.o: %.cpp
 	@echo "CC: $<"
-	@$(CXX) -c $(CXXPICFLAGS) $< -o $@
+	@$(CXX) -c $(CXXFLAGS) $< -o $@
 
 # This contains libstdc++ stubs to that you can build C++ code
 # without actually having libstdc++

apps/examples/elf/tests/hello/Makefile

@@ -39,7 +39,7 @@
 BIN = hello
 
 SRCS = $(BIN).c
-OBJS = $(BIN:.c=.o)
+OBJS = $(SRCS:.c=.o)
 
 all: $(BIN)
 

apps/examples/elf/tests/longjmp/Makefile

@@ -39,7 +39,7 @@
 BIN = longjmp
 
 SRCS = $(BIN).c
-OBJS = $(BIN:.c=.o)
+OBJS = $(SRCS:.c=.o)
 
 all: $(BIN)
 

apps/examples/elf/tests/mutex/Makefile

@@ -39,7 +39,7 @@
 BIN = mutex
 
 SRCS = $(BIN).c
-OBJS = $(BIN:.c=.o)
+OBJS = $(SRCS:.c=.o)
 
 all: $(BIN)
 

apps/examples/elf/tests/pthread/Makefile

@@ -39,7 +39,7 @@
 BIN = pthread
 
 SRCS = $(BIN).c
-OBJS = $(BIN:.c=.o)
+OBJS = $(SRCS:.c=.o)
 
 all: $(BIN)
 

apps/examples/elf/tests/signal/Makefile

@@ -39,7 +39,7 @@
 BIN = signal
 
 SRCS = $(BIN).c
-OBJS = $(BIN:.c=.o)
+OBJS = $(SRCS:.c=.o)
 
 all: $(BIN)
 

apps/examples/elf/tests/task/Makefile

@@ -39,7 +39,7 @@
 BIN = task
 
 SRCS = $(BIN).c
-OBJS = $(BIN:.c=.o)
+OBJS = $(SRCS:.c=.o)
 
 all: $(BIN)
 

nuttx/Makefile

@@ -644,7 +644,7 @@ ifneq ($(APPDIR),)
 	fi
 	@$(MAKE) -C "$(TOPDIR)/$(APPDIR)" TOPDIR="$(TOPDIR)" distclean
 	@if [ -r _SAVED_APPS_config ]; then \
-		@mv _SAVED_APPS_config "$(TOPDIR)/$(APPDIR)/.config" || \
+		mv _SAVED_APPS_config "$(TOPDIR)/$(APPDIR)/.config" || \
 			{ echo "Copy of _SAVED_APPS_config failed" ; exit 1 ; } \
 	fi
 endif

nuttx/arch/sim/src/up_elf.c

@@ -40,7 +40,9 @@
 #include <nuttx/config.h>
 
 #include <stdlib.h>
+#include <elf.h>
 #include <errno.h>
+#include <debug.h>
 
 #include <nuttx/arch.h>
 #include <nuttx/binfmt/elf.h>
@@ -113,7 +115,7 @@ int arch_relocate(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
 {
   FAR uint32_t *ptr = (FAR uint32_t *)addr;
 
-  switch (ELF_REL_TYPE(rel->r_info))
+  switch (ELF32_R_TYPE(rel->r_info))
     {
      case R_386_32:
        *ptr += sym->st_value;

nuttx/arch/x86/src/common/up_elf.c

@@ -40,7 +40,9 @@
 #include <nuttx/config.h>
 
 #include <stdlib.h>
+#include <elf.h>
 #include <errno.h>
+#include <debug.h>
 
 #include <nuttx/arch.h>
 #include <nuttx/binfmt/elf.h>
@@ -113,7 +115,7 @@ int arch_relocate(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
 {
   FAR uint32_t *ptr = (FAR uint32_t *)addr;
 
-  switch (ELF_REL_TYPE(rel->r_info))
+  switch (ELF32_R_TYPE(rel->r_info))
     {
      case R_386_32:
        *ptr += sym->st_value;

nuttx/binfmt/elf.c

@@ -139,11 +139,11 @@ static void elf_dumploadinfo(FAR struct elf_loadinfo_s *loadinfo)
   bdbg("  e_shnum:      %d\n",    loadinfo->ehdr.e_shnum);
   bdbg("  e_shstrndx:   %d\n",    loadinfo->ehdr.e_shstrndx);
 
-  if (loadinfo->shdr && loadinfo->ehdr.e_shum > 0)
+  if (loadinfo->shdr && loadinfo->ehdr.e_shnum > 0)
     {
-      for (i = 0; i < loadinfo->ehdr.e_shum; i++)
+      for (i = 0; i < loadinfo->ehdr.e_shnum; i++)
         {
-          FAR ELF32_Shdr *shdr = &loadinfo->shdr[i];
+          FAR Elf32_Shdr *shdr = &loadinfo->shdr[i];
           bdbg("Sections %d:\n", i);
           bdbg("  sh_name:      %08x\n", shdr->sh_name);
           bdbg("  sh_type:      %08x\n", shdr->sh_type);
@@ -184,7 +184,7 @@ static int elf_loadbinary(struct binary_s *binp)
   elf_dumploadinfo(&loadinfo);
   if (ret != 0)
     {
-      bdbg("Failed to initialize for load of NXFLT program: %d\n", ret);
+      bdbg("Failed to initialize for load of ELF program: %d\n", ret);
       goto errout;
     }
 
@@ -194,7 +194,7 @@ static int elf_loadbinary(struct binary_s *binp)
   elf_dumploadinfo(&loadinfo);
   if (ret != 0)
     {
-      bdbg("Failed to load NXFLT program binary: %d\n", ret);
+      bdbg("Failed to load ELF program binary: %d\n", ret);
       goto errout_with_init;
     }
 

nuttx/binfmt/libelf/Make.defs

@@ -41,7 +41,7 @@ BINFMT_CSRCS += elf.c
 
 # ELF library
 
-BINFMT_CSRCS = libelf_init.c libelf_uninit.c libelf_load.c \
+BINFMT_CSRCS += libelf_init.c libelf_uninit.c libelf_load.c \
 			   libelf_unload.c libelf_verify.c libelf_read.c \
 			   libelf_bind.c libelf_symbols.c
 

nuttx/binfmt/libelf/libelf_load.c

@@ -283,8 +283,8 @@ static inline int elf_loadfile(FAR struct elf_loadinfo_s *loadinfo)
 
       /* Update sh_addr to point to copy in memory */
 
+      bvdbg("%d. %08x->%08x\n", i, (long)shdr->sh_addr, (long)dest);
       shdr->sh_addr = (uintptr_t)dest;
-      bvdbg("%d. 0x%lx %s\n", (long)shdr->sh_addr, loadinfo->secstrings + shdr->sh_name);
 
       /* Setup the memory pointer for the next time through the loop */
 

nuttx/binfmt/libnxflat/Make.defs

@@ -41,7 +41,7 @@ BINFMT_CSRCS += nxflat.c
 
 # NXFLAT library
 
-BINFMT_CSRCS = libnxflat_init.c libnxflat_uninit.c libnxflat_load.c \
+BINFMT_CSRCS += libnxflat_init.c libnxflat_uninit.c libnxflat_load.c \
 			   libnxflat_unload.c libnxflat_verify.c libnxflat_read.c \
 			   libnxflat_bind.c
 

nuttx/binfmt/nxflat.c

@@ -158,7 +158,7 @@ static int nxflat_loadbinary(struct binary_s *binp)
   nxflat_dumploadinfo(&loadinfo);
   if (ret != 0)
     {
-      bdbg("Failed to initialize for load of NXFLT program: %d\n", ret);
+      bdbg("Failed to initialize for load of NXFLAT program: %d\n", ret);
       goto errout;
     }
 
@@ -168,7 +168,7 @@ static int nxflat_loadbinary(struct binary_s *binp)
   nxflat_dumploadinfo(&loadinfo);
   if (ret != 0)
     {
-      bdbg("Failed to load NXFLT program binary: %d\n", ret);
+      bdbg("Failed to load NXFLAT program binary: %d\n", ret);
       goto errout_with_init;
     }
 

nuttx/include/elf.h

@@ -168,7 +168,7 @@
 
 #define ELF32_ST_BIND(i)   ((i) >> 4)
 #define ELF32_ST_TYPE(i)   ((i) & 0xf)
-#define ELF32_ST_INFO(b,t) (((b)<<4)+((t)&0xf))
+#define ELF32_ST_INFO(b,t) (((b) << 4) | ((t) & 0xf))
 
 /* Figure 4-16: Symbol Binding, ELF32_ST_BIND */
 
@@ -191,8 +191,8 @@
 /* Definitions for Elf32_Rel*::r_info */
 
 #define ELF32_R_SYM(i)    ((i) >> 8)
-#define ELF32_R_TYPE(i)   ((unsigned char)(i))
+#define ELF32_R_TYPE(i)   ((i) & 0xff)
-#define ELF32_R_INFO(s,t) (((s)<<8)+(unsigned char)(t))
+#define ELF32_R_INFO(s,t) (((s)<< 8) | ((t) & 0xff))
 
 /* Figure 5-2: Segment Types, p_type */
 

nuttx/tools/mkconfig.c

@@ -116,7 +116,7 @@ int main(int argc, char **argv, char **envp)
   printf(" * configured (at present, NXFLAT is the only supported binary.\n");
   printf(" * format).\n");
   printf(" */\n\n");
-  printf("#if !defined(CONFIG_NXFLAT)\n");
+  printf("#if !defined(CONFIG_NXFLAT) && !defined(CONFIG_ELF)\n");
   printf("# undef CONFIG_BINFMT_DISABLE\n");
   printf("# define CONFIG_BINFMT_DISABLE 1\n");
   printf("#endif\n\n");