7165598: enable FDS on Solaris X64 when 7165593 is fixed
Summary: Work around 'gobjcopy' failure on Solaris X64 by adding a temporary tool that removes the SHF_ALLOC flag from "empty" section headers.
Reviewed-by: sspitsyn, acorn
--- a/hotspot/make/solaris/makefiles/defs.make Tue May 15 10:52:24 2012 -0700
+++ b/hotspot/make/solaris/makefiles/defs.make Thu May 24 12:03:42 2012 -0700
@@ -111,25 +111,10 @@
ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
# Default OBJCOPY comes from the SUNWbinutils package:
DEF_OBJCOPY=/usr/sfw/bin/gobjcopy
- ifeq ($(VM_PLATFORM),solaris_amd64)
- # On Solaris AMD64/X64, gobjcopy is not happy and fails:
- #
- # usr/sfw/bin/gobjcopy --add-gnu-debuglink=<lib>.debuginfo <lib>.so
- # BFD: stKPaiop: Not enough room for program headers, try linking with -N
- # /usr/sfw/bin/gobjcopy: stKPaiop: Bad value
- # BFD: stKPaiop: Not enough room for program headers, try linking with -N
- # /usr/sfw/bin/gobjcopy: libsaproc.debuginfo: Bad value
- # BFD: stKPaiop: Not enough room for program headers, try linking with -N
- # /usr/sfw/bin/gobjcopy: stKPaiop: Bad value
- _JUNK_ := $(shell \
- echo >&2 "INFO: $(DEF_OBJCOPY) is not working on Solaris AMD64/X64")
- OBJCOPY=
- else
- OBJCOPY=$(shell test -x $(DEF_OBJCOPY) && echo $(DEF_OBJCOPY))
- ifneq ($(ALT_OBJCOPY),)
- _JUNK_ := $(shell echo >&2 "INFO: ALT_OBJCOPY=$(ALT_OBJCOPY)")
- OBJCOPY=$(shell test -x $(ALT_OBJCOPY) && echo $(ALT_OBJCOPY))
- endif
+ OBJCOPY=$(shell test -x $(DEF_OBJCOPY) && echo $(DEF_OBJCOPY))
+ ifneq ($(ALT_OBJCOPY),)
+ _JUNK_ := $(shell echo >&2 "INFO: ALT_OBJCOPY=$(ALT_OBJCOPY)")
+ OBJCOPY=$(shell test -x $(ALT_OBJCOPY) && echo $(ALT_OBJCOPY))
endif
else
OBJCOPY=
--- a/hotspot/make/solaris/makefiles/dtrace.make Tue May 15 10:52:24 2012 -0700
+++ b/hotspot/make/solaris/makefiles/dtrace.make Thu May 24 12:03:42 2012 -0700
@@ -108,15 +108,24 @@
XLIBJVM_DTRACE_G_DEBUGINFO = 64/$(LIBJVM_DTRACE_G_DEBUGINFO)
XLIBJVM_DTRACE_G_DIZ = 64/$(LIBJVM_DTRACE_G_DIZ)
-$(XLIBJVM_DB): $(DTRACE_SRCDIR)/$(JVM_DB).c $(JVMOFFS).h $(LIBJVM_DB_MAPFILE)
+$(XLIBJVM_DB): $(ADD_GNU_DEBUGLINK) $(FIX_EMPTY_SEC_HDR_FLAGS) $(DTRACE_SRCDIR)/$(JVM_DB).c $(JVMOFFS).h $(LIBJVM_DB_MAPFILE)
@echo Making $@
$(QUIETLY) mkdir -p 64/ ; \
$(CC) $(SYMFLAG) $(ARCHFLAG/$(ISA)) -D$(TYPE) -I. -I$(GENERATED) \
$(SHARED_FLAG) $(LFLAGS_JVM_DB) -o $@ $(DTRACE_SRCDIR)/$(JVM_DB).c -lc
[ -f $(XLIBJVM_DB_G) ] || { ln -s $(LIBJVM_DB) $(XLIBJVM_DB_G); }
ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
+# gobjcopy crashes on "empty" section headers with the SHF_ALLOC flag set.
+# Clear the SHF_ALLOC flag (if set) from empty section headers.
+# An empty section header has sh_addr == 0 and sh_size == 0.
+# This problem has only been seen on Solaris X64, but we call this tool
+# on all Solaris builds just in case.
+ $(QUIETLY) $(FIX_EMPTY_SEC_HDR_FLAGS) $@
$(QUIETLY) $(OBJCOPY) --only-keep-debug $@ $(XLIBJVM_DB_DEBUGINFO)
- $(QUIETLY) $(OBJCOPY) --add-gnu-debuglink=$(XLIBJVM_DB_DEBUGINFO) $@
+# $(OBJCOPY) --add-gnu-debuglink=... corrupts SUNW_* sections.
+# Use $(ADD_GNU_DEBUGLINK) until a fixed $(OBJCOPY) is available.
+# $(QUIETLY) $(OBJCOPY) --add-gnu-debuglink=$(XLIBJVM_DB_DEBUGINFO) $@
+ $(QUIETLY) $(ADD_GNU_DEBUGLINK) $(XLIBJVM_DB_DEBUGINFO) $@
ifeq ($(STRIP_POLICY),all_strip)
$(QUIETLY) $(STRIP) $@
else
@@ -133,15 +142,19 @@
endif
endif
-$(XLIBJVM_DTRACE): $(DTRACE_SRCDIR)/$(JVM_DTRACE).c $(DTRACE_SRCDIR)/$(JVM_DTRACE).h $(LIBJVM_DTRACE_MAPFILE)
+$(XLIBJVM_DTRACE): $(ADD_GNU_DEBUGLINK) $(FIX_EMPTY_SEC_HDR_FLAGS) $(DTRACE_SRCDIR)/$(JVM_DTRACE).c $(DTRACE_SRCDIR)/$(JVM_DTRACE).h $(LIBJVM_DTRACE_MAPFILE)
@echo Making $@
$(QUIETLY) mkdir -p 64/ ; \
$(CC) $(SYMFLAG) $(ARCHFLAG/$(ISA)) -D$(TYPE) -I. \
$(SHARED_FLAG) $(LFLAGS_JVM_DTRACE) -o $@ $(DTRACE_SRCDIR)/$(JVM_DTRACE).c -lc -lthread -ldoor
[ -f $(XLIBJVM_DTRACE_G) ] || { ln -s $(LIBJVM_DTRACE) $(XLIBJVM_DTRACE_G); }
ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
+# Clear the SHF_ALLOC flag (if set) from empty section headers.
+ $(QUIETLY) $(FIX_EMPTY_SEC_HDR_FLAGS) $@
$(QUIETLY) $(OBJCOPY) --only-keep-debug $@ $(XLIBJVM_DTRACE_DEBUGINFO)
- $(QUIETLY) $(OBJCOPY) --add-gnu-debuglink=$(XLIBJVM_DTRACE_DEBUGINFO) $@
+# $(OBJCOPY) --add-gnu-debuglink=... corrupts SUNW_* sections.
+# $(QUIETLY) $(OBJCOPY) --add-gnu-debuglink=$(XLIBJVM_DTRACE_DEBUGINFO) $@
+ $(QUIETLY) $(ADD_GNU_DEBUGLINK) $(XLIBJVM_DTRACE_DEBUGINFO) $@
ifeq ($(STRIP_POLICY),all_strip)
$(QUIETLY) $(STRIP) $@
else
@@ -198,14 +211,18 @@
$(JVMOFFS.o): $(JVMOFFS).h $(JVMOFFS).cpp
$(QUIETLY) $(CXX) -c -I. -o $@ $(ARCHFLAG) -D$(TYPE) $(JVMOFFS).cpp
-$(LIBJVM_DB): $(DTRACE_SRCDIR)/$(JVM_DB).c $(JVMOFFS.o) $(XLIBJVM_DB) $(LIBJVM_DB_MAPFILE)
+$(LIBJVM_DB): $(ADD_GNU_DEBUGLINK) $(FIX_EMPTY_SEC_HDR_FLAGS) $(DTRACE_SRCDIR)/$(JVM_DB).c $(JVMOFFS.o) $(XLIBJVM_DB) $(LIBJVM_DB_MAPFILE)
@echo Making $@
$(QUIETLY) $(CC) $(SYMFLAG) $(ARCHFLAG) -D$(TYPE) -I. -I$(GENERATED) \
$(SHARED_FLAG) $(LFLAGS_JVM_DB) -o $@ $(DTRACE_SRCDIR)/$(JVM_DB).c -lc
[ -f $(LIBJVM_DB_G) ] || { ln -s $@ $(LIBJVM_DB_G); }
ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
+# Clear the SHF_ALLOC flag (if set) from empty section headers.
+ $(QUIETLY) $(FIX_EMPTY_SEC_HDR_FLAGS) $@
$(QUIETLY) $(OBJCOPY) --only-keep-debug $@ $(LIBJVM_DB_DEBUGINFO)
- $(QUIETLY) $(OBJCOPY) --add-gnu-debuglink=$(LIBJVM_DB_DEBUGINFO) $@
+# $(OBJCOPY) --add-gnu-debuglink=... corrupts SUNW_* sections.
+# $(QUIETLY) $(OBJCOPY) --add-gnu-debuglink=$(LIBJVM_DB_DEBUGINFO) $@
+ $(QUIETLY) $(ADD_GNU_DEBUGLINK) $(LIBJVM_DB_DEBUGINFO) $@
ifeq ($(STRIP_POLICY),all_strip)
$(QUIETLY) $(STRIP) $@
else
@@ -222,14 +239,18 @@
endif
endif
-$(LIBJVM_DTRACE): $(DTRACE_SRCDIR)/$(JVM_DTRACE).c $(XLIBJVM_DTRACE) $(DTRACE_SRCDIR)/$(JVM_DTRACE).h $(LIBJVM_DTRACE_MAPFILE)
+$(LIBJVM_DTRACE): $(ADD_GNU_DEBUGLINK) $(FIX_EMPTY_SEC_HDR_FLAGS) $(DTRACE_SRCDIR)/$(JVM_DTRACE).c $(XLIBJVM_DTRACE) $(DTRACE_SRCDIR)/$(JVM_DTRACE).h $(LIBJVM_DTRACE_MAPFILE)
@echo Making $@
$(QUIETLY) $(CC) $(SYMFLAG) $(ARCHFLAG) -D$(TYPE) -I. \
$(SHARED_FLAG) $(LFLAGS_JVM_DTRACE) -o $@ $(DTRACE_SRCDIR)/$(JVM_DTRACE).c -lc -lthread -ldoor
[ -f $(LIBJVM_DTRACE_G) ] || { ln -s $@ $(LIBJVM_DTRACE_G); }
ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
+# Clear the SHF_ALLOC flag (if set) from empty section headers.
+ $(QUIETLY) $(FIX_EMPTY_SEC_HDR_FLAGS) $@
$(QUIETLY) $(OBJCOPY) --only-keep-debug $@ $(LIBJVM_DTRACE_DEBUGINFO)
- $(QUIETLY) $(OBJCOPY) --add-gnu-debuglink=$(LIBJVM_DTRACE_DEBUGINFO) $@
+# $(OBJCOPY) --add-gnu-debuglink=... corrupts SUNW_* sections.
+# $(QUIETLY) $(OBJCOPY) --add-gnu-debuglink=$(LIBJVM_DTRACE_DEBUGINFO) $@
+ $(QUIETLY) $(ADD_GNU_DEBUGLINK) $(LIBJVM_DTRACE_DEBUGINFO) $@
ifeq ($(STRIP_POLICY),all_strip)
$(QUIETLY) $(STRIP) $@
else
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/make/solaris/makefiles/fix_empty_sec_hdr_flags.make Thu May 24 12:03:42 2012 -0700
@@ -0,0 +1,51 @@
+#
+# Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+#
+# This code is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License version 2 only, as
+# published by the Free Software Foundation.
+#
+# This code is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+# version 2 for more details (a copy is included in the LICENSE file that
+# accompanied this code).
+#
+# You should have received a copy of the GNU General Public License version
+# 2 along with this work; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+# or visit www.oracle.com if you need additional information or have any
+# questions.
+#
+#
+
+# Rules to build fix_empty_sec_hdr_flags, used by vm.make on Solaris
+
+GENERATED = ../generated
+FIX_EMPTY_SEC_HDR_FLAGS = $(GENERATED)/fix_empty_sec_hdr_flags
+
+FIX_EMPTY_SEC_HDR_FLAGS_DIR = $(GAMMADIR)/src/os/solaris/fix_empty_sec_hdr_flags
+FIX_EMPTY_SEC_HDR_FLAGS_SRC = $(FIX_EMPTY_SEC_HDR_FLAGS_DIR)/fix_empty_sec_hdr_flags.c
+FIX_EMPTY_SEC_HDR_FLAGS_FLAGS =
+LIBS_FIX_EMPTY_SEC_HDR_FLAGS += -lelf
+
+ifeq ("${Platform_compiler}", "sparcWorks")
+# Enable the following FIX_EMPTY_SEC_HDR_FLAGS_FLAGS addition if you need to
+# compare the built ELF objects.
+#
+# The -g option makes static data global and the "-W0,-noglobal"
+# option tells the compiler to not globalize static data using a unique
+# globalization prefix. Instead force the use of a static globalization
+# prefix based on the source filepath so the objects from two identical
+# compilations are the same.
+#
+# Note: The blog says to use "-W0,-xglobalstatic", but that doesn't
+# seem to work. I got "-W0,-noglobal" from Kelly and that works.
+#FIX_EMPTY_SEC_HDR_FLAGS_FLAGS += -W0,-noglobal
+endif # Platform_compiler == sparcWorks
+
+$(FIX_EMPTY_SEC_HDR_FLAGS): $(FIX_EMPTY_SEC_HDR_FLAGS_SRC)
+ $(CC) -g -o $@ $< $(FIX_EMPTY_SEC_HDR_FLAGS_FLAGS) $(LIBS_FIX_EMPTY_SEC_HDR_FLAGS)
--- a/hotspot/make/solaris/makefiles/jsig.make Tue May 15 10:52:24 2012 -0700
+++ b/hotspot/make/solaris/makefiles/jsig.make Thu May 24 12:03:42 2012 -0700
@@ -52,14 +52,23 @@
LFLAGS_JSIG += -mt -xnolib
endif
-$(LIBJSIG): $(JSIGSRCDIR)/jsig.c $(LIBJSIG_MAPFILE)
+$(LIBJSIG): $(ADD_GNU_DEBUGLINK) $(FIX_EMPTY_SEC_HDR_FLAGS) $(JSIGSRCDIR)/jsig.c $(LIBJSIG_MAPFILE)
@echo Making signal interposition lib...
$(QUIETLY) $(CC) $(SYMFLAG) $(ARCHFLAG) $(SHARED_FLAG) $(PICFLAG) \
- $(LFLAGS_JSIG) -o $@ $< -ldl
+ $(LFLAGS_JSIG) -o $@ $(JSIGSRCDIR)/jsig.c -ldl
[ -f $(LIBJSIG_G) ] || { ln -s $@ $(LIBJSIG_G); }
ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
+# gobjcopy crashes on "empty" section headers with the SHF_ALLOC flag set.
+# Clear the SHF_ALLOC flag (if set) from empty section headers.
+# An empty section header has sh_addr == 0 and sh_size == 0.
+# This problem has only been seen on Solaris X64, but we call this tool
+# on all Solaris builds just in case.
+ $(QUIETLY) $(FIX_EMPTY_SEC_HDR_FLAGS) $@
$(QUIETLY) $(OBJCOPY) --only-keep-debug $@ $(LIBJSIG_DEBUGINFO)
- $(QUIETLY) $(OBJCOPY) --add-gnu-debuglink=$(LIBJSIG_DEBUGINFO) $@
+# $(OBJCOPY) --add-gnu-debuglink=... corrupts SUNW_* sections.
+# Use $(ADD_GNU_DEBUGLINK) until a fixed $(OBJCOPY) is available.
+# $(QUIETLY) $(OBJCOPY) --add-gnu-debuglink=$(LIBJSIG_DEBUGINFO) $@
+ $(QUIETLY) $(ADD_GNU_DEBUGLINK) $(LIBJSIG_DEBUGINFO) $@
ifeq ($(STRIP_POLICY),all_strip)
$(QUIETLY) $(STRIP) $@
else
--- a/hotspot/make/solaris/makefiles/saproc.make Tue May 15 10:52:24 2012 -0700
+++ b/hotspot/make/solaris/makefiles/saproc.make Thu May 24 12:03:42 2012 -0700
@@ -90,7 +90,7 @@
# when actually building on Nevada-B158 or earlier:
#SOLARIS_11_B159_OR_LATER=-DSOLARIS_11_B159_OR_LATER
-$(LIBSAPROC): $(SASRCFILES) $(SAMAPFILE)
+$(LIBSAPROC): $(ADD_GNU_DEBUGLINK) $(FIX_EMPTY_SEC_HDR_FLAGS) $(SASRCFILES) $(SAMAPFILE)
$(QUIETLY) if [ "$(BOOT_JAVA_HOME)" = "" ]; then \
echo "ALT_BOOTDIR, BOOTDIR or JAVA_HOME needs to be defined to build SA"; \
exit 1; \
@@ -109,8 +109,17 @@
-ldl -ldemangle -lthread -lc
[ -f $(LIBSAPROC_G) ] || { ln -s $@ $(LIBSAPROC_G); }
ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
+# gobjcopy crashes on "empty" section headers with the SHF_ALLOC flag set.
+# Clear the SHF_ALLOC flag (if set) from empty section headers.
+# An empty section header has sh_addr == 0 and sh_size == 0.
+# This problem has only been seen on Solaris X64, but we call this tool
+# on all Solaris builds just in case.
+ $(QUIETLY) $(FIX_EMPTY_SEC_HDR_FLAGS) $@
$(QUIETLY) $(OBJCOPY) --only-keep-debug $@ $(LIBSAPROC_DEBUGINFO)
- $(QUIETLY) $(OBJCOPY) --add-gnu-debuglink=$(LIBSAPROC_DEBUGINFO) $@
+# $(OBJCOPY) --add-gnu-debuglink=... corrupts SUNW_* sections.
+# Use $(ADD_GNU_DEBUGLINK) until a fixed $(OBJCOPY) is available.
+# $(QUIETLY) $(OBJCOPY) --add-gnu-debuglink=$(LIBSAPROC_DEBUGINFO) $@
+ $(QUIETLY) $(ADD_GNU_DEBUGLINK) $(LIBSAPROC_DEBUGINFO) $@
ifeq ($(STRIP_POLICY),all_strip)
$(QUIETLY) $(STRIP) $@
else
--- a/hotspot/make/solaris/makefiles/vm.make Tue May 15 10:52:24 2012 -0700
+++ b/hotspot/make/solaris/makefiles/vm.make Thu May 24 12:03:42 2012 -0700
@@ -149,6 +149,10 @@
include $(MAKEFILES_DIR)/add_gnu_debuglink.make
#----------------------------------------------------------------------
+# fix_empty_sec_hdr_flags tool
+include $(MAKEFILES_DIR)/fix_empty_sec_hdr_flags.make
+
+#----------------------------------------------------------------------
# JVM
JVM = jvm
@@ -280,7 +284,7 @@
LINK_VM = $(LINK_LIB.CXX)
endif
# making the library:
-$(LIBJVM): $(ADD_GNU_DEBUGLINK) $(LIBJVM.o) $(LIBJVM_MAPFILE)
+$(LIBJVM): $(ADD_GNU_DEBUGLINK) $(FIX_EMPTY_SEC_HDR_FLAGS) $(LIBJVM.o) $(LIBJVM_MAPFILE)
ifeq ($(filter -sbfast -xsbfast, $(CFLAGS_BROWSE)),)
@echo Linking vm...
$(QUIETLY) $(LINK_LIB.CXX/PRE_HOOK)
@@ -290,10 +294,15 @@
$(QUIETLY) [ -f $(LIBJVM_G) ] || ln -s $@ $(LIBJVM_G)
$(QUIETLY) [ -f $(LIBJVM_G).1 ] || ln -s $@.1 $(LIBJVM_G).1
ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
+# gobjcopy crashes on "empty" section headers with the SHF_ALLOC flag set.
+# Clear the SHF_ALLOC flag (if set) from empty section headers.
+# An empty section header has sh_addr == 0 and sh_size == 0.
+# This problem has only been seen on Solaris X64, but we call this tool
+# on all Solaris builds just in case.
+ $(QUIETLY) $(FIX_EMPTY_SEC_HDR_FLAGS) $@
$(QUIETLY) $(OBJCOPY) --only-keep-debug $@ $(LIBJVM_DEBUGINFO)
-# $(OBJCOPY) --add-gnu-debuglink=... corrupts the SUNW_dof section
-# in libjvm.so. Use $(ADD_GNU_DEBUGLINK) until a fixed $(OBJCOPY)
-# is available.
+# $(OBJCOPY) --add-gnu-debuglink=... corrupts SUNW_* sections.
+# Use $(ADD_GNU_DEBUGLINK) until a fixed $(OBJCOPY) is available.
# $(QUIETLY) $(OBJCOPY) --add-gnu-debuglink=$(LIBJVM_DEBUGINFO) $@
$(QUIETLY) $(ADD_GNU_DEBUGLINK) $(LIBJVM_DEBUGINFO) $@
ifeq ($(STRIP_POLICY),all_strip)
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/os/solaris/fix_empty_sec_hdr_flags/fix_empty_sec_hdr_flags.c Thu May 24 12:03:42 2012 -0700
@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+/*
+ * Name: fix_empty_sec_hdr_flags.c
+ *
+ * Description: Remove the SHF_ALLOC flag from "empty" section headers.
+ * An "empty" section header has sh_addr == 0 and sh_size == 0.
+ *
+ * This program is adapted from the example program shown on the
+ * elf(3elf) man page and from code from the Solaris compiler
+ * driver.
+ */
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <libelf.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static void failure(void);
+
+void
+main(int argc, char ** argv) {
+ void * ehdr; /* ELF header */
+ unsigned int i; /* section counter */
+ int fd; /* descriptor for file */
+ Elf * elf; /* ELF descriptor */
+ char * elf_ident; /* ELF identity string */
+ char * elf_obj; /* elf_obj file */
+ int fix_count; /* number of flags fixed */
+ int is_elfclass64; /* is an ELFCLASS64 file? */
+ Elf_Scn * scn; /* ELF section descriptor */
+ void * shdr; /* ELF section header */
+ Elf_Data * shstrtab; /* ELF section header string table */
+
+ if (argc != 2) {
+ (void) fprintf(stderr, "Usage: %s elf_obj\n", argv[0]);
+ exit(2);
+ }
+
+ /* open the elf_obj */
+ elf_obj = argv[1];
+ if ((fd = open(elf_obj, O_RDWR)) == -1) {
+ (void) fprintf(stderr, "%s: cannot open file.\n", elf_obj);
+ exit(3);
+ }
+
+ (void) printf("Opening '%s' for update\n", elf_obj);
+ (void) fflush(stdout);
+ (void) elf_version(EV_CURRENT); /* coordinate ELF versions */
+
+ /* obtain the ELF descriptors from the input file */
+ if ((elf = elf_begin(fd, ELF_C_RDWR, NULL)) == NULL) {
+ failure();
+ }
+
+ /* determine if ELFCLASS64 or not? */
+ elf_ident = elf_getident(elf, NULL);
+ is_elfclass64 = (elf_ident[EI_CLASS] == ELFCLASS64);
+
+ /* get the ELF header */
+ if (is_elfclass64) {
+ ehdr = elf64_getehdr(elf);
+ } else {
+ ehdr = elf32_getehdr(elf);
+ }
+ if (ehdr == NULL) {
+ failure();
+ }
+
+ /* get the ELF section descriptor */
+ if (is_elfclass64) {
+ scn = elf_getscn(elf, ((Elf64_Ehdr *) ehdr)->e_shstrndx);
+ } else {
+ scn = elf_getscn(elf, ((Elf32_Ehdr *) ehdr)->e_shstrndx);
+ }
+ if (scn == NULL) {
+ failure();
+ }
+
+ /* get the section header string table */
+ shstrtab = elf_getdata(scn, NULL);
+ if (shstrtab == NULL) {
+ failure();
+ }
+
+ fix_count = 0;
+
+ /* traverse the sections of the input file */
+ for (i = 1, scn = NULL; scn = elf_nextscn(elf, scn); i++) {
+ int has_flag_set; /* is SHF_ALLOC flag set? */
+ int is_empty; /* is section empty? */
+ char * name; /* short hand pointer */
+
+ /* get the section header */
+ if (is_elfclass64) {
+ shdr = elf64_getshdr(scn);
+ } else {
+ shdr = elf32_getshdr(scn);
+ }
+ if (shdr == NULL) {
+ failure();
+ }
+
+ if (is_elfclass64) {
+ name = (char *)shstrtab->d_buf + ((Elf64_Shdr *) shdr)->sh_name;
+ } else {
+ name = (char *)shstrtab->d_buf + ((Elf32_Shdr *) shdr)->sh_name;
+ }
+
+ if (is_elfclass64) {
+ has_flag_set = ((Elf64_Shdr *) shdr)->sh_flags & SHF_ALLOC;
+ is_empty = ((Elf64_Shdr *) shdr)->sh_addr == 0 &&
+ ((Elf64_Shdr *) shdr)->sh_size == 0;
+ } else {
+ has_flag_set = ((Elf32_Shdr *) shdr)->sh_flags & SHF_ALLOC;
+ is_empty = ((Elf32_Shdr *) shdr)->sh_addr == 0 &&
+ ((Elf32_Shdr *) shdr)->sh_size == 0;
+ }
+
+ if (is_empty && has_flag_set) {
+ (void) printf("section[%u] '%s' is empty, "
+ "but SHF_ALLOC flag is set.\n", i, name);
+ (void) printf("Clearing the SHF_ALLOC flag.\n");
+
+ if (is_elfclass64) {
+ ((Elf64_Shdr *) shdr)->sh_flags &= ~SHF_ALLOC;
+ } else {
+ ((Elf32_Shdr *) shdr)->sh_flags &= ~SHF_ALLOC;
+ }
+ fix_count++;
+ }
+ } /* end for each ELF section */
+
+ if (fix_count > 0) {
+ (void) printf("Saving %d updates to '%s'\n", fix_count, elf_obj);
+ (void) fflush(stdout);
+ (void) elf_update(elf, ELF_C_NULL); /* recalc ELF memory structures */
+ (void) elf_update(elf, ELF_C_WRITE); /* write out changes to ELF obj */
+ } else {
+ (void) printf("No SHF_ALLOC flags needed to be cleared.\n");
+ }
+
+ (void) elf_end(elf); /* done with ELF obj */
+ (void) close(fd);
+
+ (void) printf("Done %s '%s'\n",
+ (fix_count > 0) ? "updating" : "with", elf_obj);
+ (void) fflush(stdout);
+ exit(0);
+} /* end main */
+
+
+static void
+failure() {
+ (void) fprintf(stderr, "%s\n", elf_errmsg(elf_errno()));
+ exit(6);
+}