[PATCH,V2 15/15] doc: add SFrame spec file

[Indu Bhagat <indu.bhagat@oracle.com>]

[New addition in V2]

PS: libsframe/configure has NOT been included in the patch.  Please
regenerate.

ChangeLog:

	* libsframe/Makefile.am: Add info-in-builddir to
	  AUTOMAKE_OPTIONS. Include doc/local.mk.
	* libsframe/Makefile.in: Regenerated.
	* libsframe/configure: Likewise.  <-- [REMOVED FROM THE PATCH.
	  PLEASE REGENERATE. ]
	* libsframe/configure.ac: Check for makeinfo and set BUILD_INFO.
	* libsframe/doc/local.mk: New file.
	* libsframe/doc/sframe-spec.texi: Likewise.
---
 libsframe/Makefile.am          |   9 +-
 libsframe/Makefile.in          | 410 +++++++++++++++++++---
 libsframe/configure.ac         |  21 ++
 libsframe/doc/local.mk         |  40 +++
 libsframe/doc/sframe-spec.texi | 614 +++++++++++++++++++++++++++++++++
 5 files changed, 1049 insertions(+), 45 deletions(-)
 create mode 100644 libsframe/doc/local.mk
 create mode 100644 libsframe/doc/sframe-spec.texi

diff --git a/libsframe/Makefile.am b/libsframe/Makefile.am
index 1b8a1081975..355e5d813b6 100644
--- a/libsframe/Makefile.am
+++ b/libsframe/Makefile.am
@@ -21,7 +21,12 @@ SUBDIRS = testsuite
 
 ACLOCAL_AMFLAGS = -I .. -I ../config
 
-AUTOMAKE_OPTIONS = foreign no-texinfo.tex
+AUTOMAKE_OPTIONS = foreign info-in-builddir no-texinfo.tex
+
+# Variables that we might accumulate conditionally or in subdirs.
+info_TEXINFOS =
+DISTCLEANFILES =
+MAINTAINERCLEANFILES =
 
 BASEDIR = $(srcdir)/..
 INCDIR = $(srcdir)/../include
@@ -52,3 +57,5 @@ else
   noinst_LTLIBRARIES += libsframebt.la
 endif
 endif
+
+include doc/local.mk
diff --git a/libsframe/Makefile.in b/libsframe/Makefile.in
index 945df1e539d..7e5d5128766 100644
--- a/libsframe/Makefile.in
+++ b/libsframe/Makefile.in
@@ -32,6 +32,24 @@
 # <http://www.gnu.org/licenses/>.
 #
 
+#
+#   Copyright (C) 2019-2022 Free Software Foundation, Inc.
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program 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 for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; see the file COPYING.  If not see
+# <http://www.gnu.org/licenses/>.
+#
+
 
 VPATH = @srcdir@
 am__is_gnu_make = { \
@@ -110,6 +128,9 @@ host_triplet = @host@
 @HAVE_SFRAME_AS_TRUE@@INSTALL_LIBBFD_TRUE@am__append_1 = libsframebt.la
 @HAVE_SFRAME_AS_TRUE@@INSTALL_LIBBFD_TRUE@am__append_2 = $(INCDIR)/sframe-backtrace-api.h
 @HAVE_SFRAME_AS_TRUE@@INSTALL_LIBBFD_FALSE@am__append_3 = libsframebt.la
+@BUILD_INFO_TRUE@am__append_4 = doc/sframe-spec.texi
+@BUILD_INFO_TRUE@am__append_5 = texput.log
+@BUILD_INFO_TRUE@am__append_6 = doc/sframe-spec.info
 subdir = .
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/../bfd/acinclude.m4 \
@@ -162,7 +183,8 @@ am__uninstall_files_from_dir = { \
     || { echo " ( cd '$$dir' && rm -f" $$files ")"; \
          $(am__cd) "$$dir" && rm -f $$files; }; \
   }
-am__installdirs = "$(DESTDIR)$(libdir)" "$(DESTDIR)$(includedir)"
+am__installdirs = "$(DESTDIR)$(libdir)" "$(DESTDIR)$(infodir)" \
+	"$(DESTDIR)$(includedir)"
 LTLIBRARIES = $(lib_LTLIBRARIES) $(noinst_LTLIBRARIES)
 libsframe_la_LIBADD =
 am_libsframe_la_OBJECTS = libsframe_la-sframe.lo \
@@ -225,6 +247,47 @@ am__v_CCLD_1 =
 SOURCES = $(libsframe_la_SOURCES) $(libsframebt_la_SOURCES)
 DIST_SOURCES = $(libsframe_la_SOURCES) \
 	$(am__libsframebt_la_SOURCES_DIST)
+AM_V_DVIPS = $(am__v_DVIPS_@AM_V@)
+am__v_DVIPS_ = $(am__v_DVIPS_@AM_DEFAULT_V@)
+am__v_DVIPS_0 = @echo "  DVIPS   " $@;
+am__v_DVIPS_1 = 
+AM_V_MAKEINFO = $(am__v_MAKEINFO_@AM_V@)
+am__v_MAKEINFO_ = $(am__v_MAKEINFO_@AM_DEFAULT_V@)
+am__v_MAKEINFO_0 = @echo "  MAKEINFO" $@;
+am__v_MAKEINFO_1 = 
+AM_V_INFOHTML = $(am__v_INFOHTML_@AM_V@)
+am__v_INFOHTML_ = $(am__v_INFOHTML_@AM_DEFAULT_V@)
+am__v_INFOHTML_0 = @echo "  INFOHTML" $@;
+am__v_INFOHTML_1 = 
+AM_V_TEXI2DVI = $(am__v_TEXI2DVI_@AM_V@)
+am__v_TEXI2DVI_ = $(am__v_TEXI2DVI_@AM_DEFAULT_V@)
+am__v_TEXI2DVI_0 = @echo "  TEXI2DVI" $@;
+am__v_TEXI2DVI_1 = 
+AM_V_TEXI2PDF = $(am__v_TEXI2PDF_@AM_V@)
+am__v_TEXI2PDF_ = $(am__v_TEXI2PDF_@AM_DEFAULT_V@)
+am__v_TEXI2PDF_0 = @echo "  TEXI2PDF" $@;
+am__v_TEXI2PDF_1 = 
+AM_V_texinfo = $(am__v_texinfo_@AM_V@)
+am__v_texinfo_ = $(am__v_texinfo_@AM_DEFAULT_V@)
+am__v_texinfo_0 = -q
+am__v_texinfo_1 = 
+AM_V_texidevnull = $(am__v_texidevnull_@AM_V@)
+am__v_texidevnull_ = $(am__v_texidevnull_@AM_DEFAULT_V@)
+am__v_texidevnull_0 = > /dev/null
+am__v_texidevnull_1 = 
+am__dirstamp = $(am__leading_dot)dirstamp
+INFO_DEPS = doc/sframe-spec.info
+am__TEXINFO_TEX_DIR = $(srcdir)
+DVIS = doc/sframe-spec.dvi
+PDFS = doc/sframe-spec.pdf
+PSS = doc/sframe-spec.ps
+HTMLS = doc/sframe-spec.html
+TEXINFOS = $(am__append_4)
+TEXI2DVI = texi2dvi
+TEXI2PDF = $(TEXI2DVI) --pdf --batch
+MAKEINFOHTML = $(MAKEINFO) --html
+AM_MAKEINFOHTMLFLAGS = $(AM_MAKEINFOFLAGS)
+DVIPS = dvips
 RECURSIVE_TARGETS = all-recursive check-recursive cscopelist-recursive \
 	ctags-recursive dvi-recursive html-recursive info-recursive \
 	install-data-recursive install-dvi-recursive \
@@ -272,11 +335,11 @@ CTAGS = ctags
 CSCOPE = cscope
 DIST_SUBDIRS = $(SUBDIRS)
 am__DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/config.h.in \
-	$(top_srcdir)/../ar-lib $(top_srcdir)/../compile \
-	$(top_srcdir)/../config.guess $(top_srcdir)/../config.sub \
-	$(top_srcdir)/../depcomp $(top_srcdir)/../install-sh \
-	$(top_srcdir)/../ltmain.sh $(top_srcdir)/../missing \
-	$(top_srcdir)/../mkinstalldirs
+	$(srcdir)/doc/local.mk $(top_srcdir)/../ar-lib \
+	$(top_srcdir)/../compile $(top_srcdir)/../config.guess \
+	$(top_srcdir)/../config.sub $(top_srcdir)/../depcomp \
+	$(top_srcdir)/../install-sh $(top_srcdir)/../ltmain.sh \
+	$(top_srcdir)/../missing $(top_srcdir)/../mkinstalldirs
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 distdir = $(PACKAGE)-$(VERSION)
 top_distdir = $(distdir)
@@ -443,7 +506,12 @@ top_srcdir = @top_srcdir@
 warn = @warn@
 SUBDIRS = testsuite
 ACLOCAL_AMFLAGS = -I .. -I ../config
-AUTOMAKE_OPTIONS = foreign no-texinfo.tex
+AUTOMAKE_OPTIONS = foreign info-in-builddir no-texinfo.tex
+
+# Variables that we might accumulate conditionally or in subdirs.
+info_TEXINFOS = $(am__append_4)
+DISTCLEANFILES = $(am__append_5)
+MAINTAINERCLEANFILES = $(am__append_6)
 BASEDIR = $(srcdir)/..
 INCDIR = $(srcdir)/../include
 # include libctf for swap.h
@@ -462,14 +530,15 @@ libsframe_la_CPPFLAGS = -D_GNU_SOURCE -I$(srcdir) -I$(srcdir)/../include \
 @HAVE_SFRAME_AS_TRUE@libsframebt_la_SOURCES = sframe-backtrace.c sframe-backtrace-err.c
 @HAVE_SFRAME_AS_TRUE@libsframebt_la_CPPFLAGS = -I$(srcdir) -I$(srcdir)/../include
 @HAVE_SFRAME_AS_TRUE@libsframebt_la_CFLAGS = -Wa,--gsframe
+@BUILD_INFO_TRUE@AM_MAKEINFOFLAGS = --no-split
 all: config.h
 	$(MAKE) $(AM_MAKEFLAGS) all-recursive
 
 .SUFFIXES:
-.SUFFIXES: .c .lo .o .obj
+.SUFFIXES: .c .dvi .lo .o .obj .ps
 am--refresh: Makefile
 	@:
-$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am $(srcdir)/doc/local.mk $(am__configure_deps)
 	@for dep in $?; do \
 	  case '$(am__configure_deps)' in \
 	    *$$dep*) \
@@ -491,6 +560,7 @@ Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
 	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__depfiles_maybe)'; \
 	    cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__depfiles_maybe);; \
 	esac;
+$(srcdir)/doc/local.mk $(am__empty):
 
 $(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
 	$(SHELL) ./config.status --recheck
@@ -644,6 +714,145 @@ clean-libtool:
 
 distclean-libtool:
 	-rm -f libtool config.lt
+doc/$(am__dirstamp):
+	@$(MKDIR_P) doc
+	@: > doc/$(am__dirstamp)
+
+@BUILD_INFO_TRUE@doc/sframe-spec.info: doc/sframe-spec.texi 
+@BUILD_INFO_TRUE@	@test -f doc/$(am__dirstamp) || $(MAKE) $(AM_MAKEFLAGS) doc/$(am__dirstamp)
+@BUILD_INFO_TRUE@	$(AM_V_MAKEINFO)restore=: && backupdir="$(am__leading_dot)am$$$$" && \
+@BUILD_INFO_TRUE@	rm -rf $$backupdir && mkdir $$backupdir && \
+@BUILD_INFO_TRUE@	if ($(MAKEINFO) --version) >/dev/null 2>&1; then \
+@BUILD_INFO_TRUE@	  for f in $@ $@-[0-9] $@-[0-9][0-9] $(@:.info=).i[0-9] $(@:.info=).i[0-9][0-9]; do \
+@BUILD_INFO_TRUE@	    if test -f $$f; then mv $$f $$backupdir; restore=mv; else :; fi; \
+@BUILD_INFO_TRUE@	  done; \
+@BUILD_INFO_TRUE@	else :; fi && \
+@BUILD_INFO_TRUE@	if $(MAKEINFO) $(AM_MAKEINFOFLAGS) $(MAKEINFOFLAGS) -I doc -I $(srcdir)/doc \
+@BUILD_INFO_TRUE@	 -o $@ `test -f 'doc/sframe-spec.texi' || echo '$(srcdir)/'`doc/sframe-spec.texi; \
+@BUILD_INFO_TRUE@	then \
+@BUILD_INFO_TRUE@	  rc=0; \
+@BUILD_INFO_TRUE@	else \
+@BUILD_INFO_TRUE@	  rc=$$?; \
+@BUILD_INFO_TRUE@	  $$restore $$backupdir/* `echo "./$@" | sed 's|[^/]*$$||'`; \
+@BUILD_INFO_TRUE@	fi; \
+@BUILD_INFO_TRUE@	rm -rf $$backupdir; exit $$rc
+
+doc/sframe-spec.dvi: doc/sframe-spec.texi  doc/$(am__dirstamp)
+	$(AM_V_TEXI2DVI)TEXINPUTS="$(am__TEXINFO_TEX_DIR)$(PATH_SEPARATOR)$$TEXINPUTS" \
+	MAKEINFO='$(MAKEINFO) $(AM_MAKEINFOFLAGS) $(MAKEINFOFLAGS) -I doc -I $(srcdir)/doc' \
+	$(TEXI2DVI) $(AM_V_texinfo) --build-dir=$(@:.dvi=.t2d) -o $@ $(AM_V_texidevnull) \
+	`test -f 'doc/sframe-spec.texi' || echo '$(srcdir)/'`doc/sframe-spec.texi
+
+doc/sframe-spec.pdf: doc/sframe-spec.texi  doc/$(am__dirstamp)
+	$(AM_V_TEXI2PDF)TEXINPUTS="$(am__TEXINFO_TEX_DIR)$(PATH_SEPARATOR)$$TEXINPUTS" \
+	MAKEINFO='$(MAKEINFO) $(AM_MAKEINFOFLAGS) $(MAKEINFOFLAGS) -I doc -I $(srcdir)/doc' \
+	$(TEXI2PDF) $(AM_V_texinfo) --build-dir=$(@:.pdf=.t2p) -o $@ $(AM_V_texidevnull) \
+	`test -f 'doc/sframe-spec.texi' || echo '$(srcdir)/'`doc/sframe-spec.texi
+
+doc/sframe-spec.html: doc/sframe-spec.texi  doc/$(am__dirstamp)
+	$(AM_V_MAKEINFO)rm -rf $(@:.html=.htp)
+	$(AM_V_at)if $(MAKEINFOHTML) $(AM_MAKEINFOHTMLFLAGS) $(MAKEINFOFLAGS) -I doc -I $(srcdir)/doc \
+	 -o $(@:.html=.htp) `test -f 'doc/sframe-spec.texi' || echo '$(srcdir)/'`doc/sframe-spec.texi; \
+	then \
+	  rm -rf $@ && mv $(@:.html=.htp) $@; \
+	else \
+	  rm -rf $(@:.html=.htp); exit 1; \
+	fi
+.dvi.ps:
+	$(AM_V_DVIPS)TEXINPUTS="$(am__TEXINFO_TEX_DIR)$(PATH_SEPARATOR)$$TEXINPUTS" \
+	$(DVIPS) $(AM_V_texinfo) -o $@ $<
+
+uninstall-dvi-am:
+	@$(NORMAL_UNINSTALL)
+	@list='$(DVIS)'; test -n "$(dvidir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " rm -f '$(DESTDIR)$(dvidir)/$$f'"; \
+	  rm -f "$(DESTDIR)$(dvidir)/$$f"; \
+	done
+
+uninstall-html-am:
+	@$(NORMAL_UNINSTALL)
+	@list='$(HTMLS)'; test -n "$(htmldir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " rm -rf '$(DESTDIR)$(htmldir)/$$f'"; \
+	  rm -rf "$(DESTDIR)$(htmldir)/$$f"; \
+	done
+
+uninstall-info-am:
+	@$(PRE_UNINSTALL)
+	@if test -d '$(DESTDIR)$(infodir)' && $(am__can_run_installinfo); then \
+	  list='$(INFO_DEPS)'; \
+	  for file in $$list; do \
+	    relfile=`echo "$$file" | sed 's|^.*/||'`; \
+	    echo " install-info --info-dir='$(DESTDIR)$(infodir)' --remove '$(DESTDIR)$(infodir)/$$relfile'"; \
+	    if install-info --info-dir="$(DESTDIR)$(infodir)" --remove "$(DESTDIR)$(infodir)/$$relfile"; \
+	    then :; else test ! -f "$(DESTDIR)$(infodir)/$$relfile" || exit 1; fi; \
+	  done; \
+	else :; fi
+	@$(NORMAL_UNINSTALL)
+	@list='$(INFO_DEPS)'; \
+	for file in $$list; do \
+	  relfile=`echo "$$file" | sed 's|^.*/||'`; \
+	  relfile_i=`echo "$$relfile" | sed 's|\.info$$||;s|$$|.i|'`; \
+	  (if test -d "$(DESTDIR)$(infodir)" && cd "$(DESTDIR)$(infodir)"; then \
+	     echo " cd '$(DESTDIR)$(infodir)' && rm -f $$relfile $$relfile-[0-9] $$relfile-[0-9][0-9] $$relfile_i[0-9] $$relfile_i[0-9][0-9]"; \
+	     rm -f $$relfile $$relfile-[0-9] $$relfile-[0-9][0-9] $$relfile_i[0-9] $$relfile_i[0-9][0-9]; \
+	   else :; fi); \
+	done
+
+uninstall-pdf-am:
+	@$(NORMAL_UNINSTALL)
+	@list='$(PDFS)'; test -n "$(pdfdir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " rm -f '$(DESTDIR)$(pdfdir)/$$f'"; \
+	  rm -f "$(DESTDIR)$(pdfdir)/$$f"; \
+	done
+
+uninstall-ps-am:
+	@$(NORMAL_UNINSTALL)
+	@list='$(PSS)'; test -n "$(psdir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " rm -f '$(DESTDIR)$(psdir)/$$f'"; \
+	  rm -f "$(DESTDIR)$(psdir)/$$f"; \
+	done
+
+dist-info: $(INFO_DEPS)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`; \
+	list='$(INFO_DEPS)'; \
+	for base in $$list; do \
+	  case $$base in \
+	    $(srcdir)/*) base=`echo "$$base" | sed "s|^$$srcdirstrip/||"`;; \
+	  esac; \
+	  if test -f $$base; then d=.; else d=$(srcdir); fi; \
+	  base_i=`echo "$$base" | sed 's|\.info$$||;s|$$|.i|'`; \
+	  for file in $$d/$$base $$d/$$base-[0-9] $$d/$$base-[0-9][0-9] $$d/$$base_i[0-9] $$d/$$base_i[0-9][0-9]; do \
+	    if test -f $$file; then \
+	      relfile=`expr "$$file" : "$$d/\(.*\)"`; \
+	      test -f "$(distdir)/$$relfile" || \
+		cp -p $$file "$(distdir)/$$relfile"; \
+	    else :; fi; \
+	  done; \
+	done
+
+mostlyclean-aminfo:
+	-rm -rf doc/sframe-spec.t2d doc/sframe-spec.t2p
+
+clean-aminfo:
+	-test -z "doc/sframe-spec.dvi doc/sframe-spec.pdf doc/sframe-spec.ps \
+	  doc/sframe-spec.html" \
+	|| rm -rf doc/sframe-spec.dvi doc/sframe-spec.pdf doc/sframe-spec.ps \
+	  doc/sframe-spec.html
+
+maintainer-clean-aminfo:
+	@list='$(INFO_DEPS)'; for i in $$list; do \
+	  i_i=`echo "$$i" | sed 's|\.info$$||;s|$$|.i|'`; \
+	  echo " rm -f $$i $$i-[0-9] $$i-[0-9][0-9] $$i_i[0-9] $$i_i[0-9][0-9]"; \
+	  rm -f $$i $$i-[0-9] $$i-[0-9][0-9] $$i_i[0-9] $$i_i[0-9][0-9]; \
+	done
 install-includeHEADERS: $(include_HEADERS)
 	@$(NORMAL_INSTALL)
 	@list='$(include_HEADERS)'; test -n "$(includedir)" || list=; \
@@ -829,6 +1038,9 @@ distdir: $(DISTFILES)
 	      || exit 1; \
 	  fi; \
 	done
+	$(MAKE) $(AM_MAKEFLAGS) \
+	  top_distdir="$(top_distdir)" distdir="$(distdir)" \
+	  dist-info
 	-test -n "$(am__skip_mode_fix)" \
 	|| find "$(distdir)" -type d ! -perm -755 \
 		-exec chmod u+rwx,go+rx {} \; -o \
@@ -962,10 +1174,10 @@ distcleancheck: distclean
 	       exit 1; } >&2
 check-am: all-am
 check: check-recursive
-all-am: Makefile $(LTLIBRARIES) $(HEADERS) config.h
+all-am: Makefile $(INFO_DEPS) $(LTLIBRARIES) $(HEADERS) config.h
 installdirs: installdirs-recursive
 installdirs-am:
-	for dir in "$(DESTDIR)$(libdir)" "$(DESTDIR)$(includedir)"; do \
+	for dir in "$(DESTDIR)$(libdir)" "$(DESTDIR)$(infodir)" "$(DESTDIR)$(includedir)"; do \
 	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
 	done
 install: install-recursive
@@ -994,14 +1206,18 @@ clean-generic:
 distclean-generic:
 	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
 	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+	-rm -f doc/$(am__dirstamp)
+	-test -z "$(DISTCLEANFILES)" || rm -f $(DISTCLEANFILES)
 
 maintainer-clean-generic:
 	@echo "This command is intended for maintainers to use"
 	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+@BUILD_INFO_FALSE@html-local:
 clean: clean-recursive
 
-clean-am: clean-generic clean-libLTLIBRARIES clean-libtool \
-	clean-noinstLTLIBRARIES mostlyclean-am
+clean-am: clean-aminfo clean-generic clean-libLTLIBRARIES \
+	clean-libtool clean-noinstLTLIBRARIES mostlyclean-am
 
 distclean: distclean-recursive
 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
@@ -1012,42 +1228,133 @@ distclean-am: clean-am distclean-compile distclean-generic \
 
 dvi: dvi-recursive
 
-dvi-am:
+dvi-am: $(DVIS)
 
 html: html-recursive
 
-html-am:
+html-am: $(HTMLS) html-local
 
 info: info-recursive
 
-info-am:
+info-am: $(INFO_DEPS)
 
-install-data-am: install-includeHEADERS
+install-data-am: install-includeHEADERS install-info-am
 
 install-dvi: install-dvi-recursive
 
-install-dvi-am:
-
+install-dvi-am: $(DVIS)
+	@$(NORMAL_INSTALL)
+	@list='$(DVIS)'; test -n "$(dvidir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(dvidir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(dvidir)" || exit 1; \
+	fi; \
+	for p in $$list; do \
+	  if test -f "$$p"; then d=; else d="$(srcdir)/"; fi; \
+	  echo "$$d$$p"; \
+	done | $(am__base_list) | \
+	while read files; do \
+	  echo " $(INSTALL_DATA) $$files '$(DESTDIR)$(dvidir)'"; \
+	  $(INSTALL_DATA) $$files "$(DESTDIR)$(dvidir)" || exit $$?; \
+	done
 install-exec-am: install-libLTLIBRARIES
 
 install-html: install-html-recursive
 
-install-html-am:
-
+install-html-am: $(HTMLS)
+	@$(NORMAL_INSTALL)
+	@list='$(HTMLS)'; list2=; test -n "$(htmldir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(htmldir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(htmldir)" || exit 1; \
+	fi; \
+	for p in $$list; do \
+	  if test -f "$$p" || test -d "$$p"; then d=; else d="$(srcdir)/"; fi; \
+	  $(am__strip_dir) \
+	  d2=$$d$$p; \
+	  if test -d "$$d2"; then \
+	    echo " $(MKDIR_P) '$(DESTDIR)$(htmldir)/$$f'"; \
+	    $(MKDIR_P) "$(DESTDIR)$(htmldir)/$$f" || exit 1; \
+	    echo " $(INSTALL_DATA) '$$d2'/* '$(DESTDIR)$(htmldir)/$$f'"; \
+	    $(INSTALL_DATA) "$$d2"/* "$(DESTDIR)$(htmldir)/$$f" || exit $$?; \
+	  else \
+	    list2="$$list2 $$d2"; \
+	  fi; \
+	done; \
+	test -z "$$list2" || { echo "$$list2" | $(am__base_list) | \
+	while read files; do \
+	  echo " $(INSTALL_DATA) $$files '$(DESTDIR)$(htmldir)'"; \
+	  $(INSTALL_DATA) $$files "$(DESTDIR)$(htmldir)" || exit $$?; \
+	done; }
 install-info: install-info-recursive
 
-install-info-am:
-
+install-info-am: $(INFO_DEPS)
+	@$(NORMAL_INSTALL)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`; \
+	list='$(INFO_DEPS)'; test -n "$(infodir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(infodir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(infodir)" || exit 1; \
+	fi; \
+	for file in $$list; do \
+	  case $$file in \
+	    $(srcdir)/*) file=`echo "$$file" | sed "s|^$$srcdirstrip/||"`;; \
+	  esac; \
+	  if test -f $$file; then d=.; else d=$(srcdir); fi; \
+	  file_i=`echo "$$file" | sed 's|\.info$$||;s|$$|.i|'`; \
+	  for ifile in $$d/$$file $$d/$$file-[0-9] $$d/$$file-[0-9][0-9] \
+	               $$d/$$file_i[0-9] $$d/$$file_i[0-9][0-9] ; do \
+	    if test -f $$ifile; then \
+	      echo "$$ifile"; \
+	    else : ; fi; \
+	  done; \
+	done | $(am__base_list) | \
+	while read files; do \
+	  echo " $(INSTALL_DATA) $$files '$(DESTDIR)$(infodir)'"; \
+	  $(INSTALL_DATA) $$files "$(DESTDIR)$(infodir)" || exit $$?; done
+	@$(POST_INSTALL)
+	@if $(am__can_run_installinfo); then \
+	  list='$(INFO_DEPS)'; test -n "$(infodir)" || list=; \
+	  for file in $$list; do \
+	    relfile=`echo "$$file" | sed 's|^.*/||'`; \
+	    echo " install-info --info-dir='$(DESTDIR)$(infodir)' '$(DESTDIR)$(infodir)/$$relfile'";\
+	    install-info --info-dir="$(DESTDIR)$(infodir)" "$(DESTDIR)$(infodir)/$$relfile" || :;\
+	  done; \
+	else : ; fi
 install-man:
 
 install-pdf: install-pdf-recursive
 
-install-pdf-am:
-
+install-pdf-am: $(PDFS)
+	@$(NORMAL_INSTALL)
+	@list='$(PDFS)'; test -n "$(pdfdir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(pdfdir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(pdfdir)" || exit 1; \
+	fi; \
+	for p in $$list; do \
+	  if test -f "$$p"; then d=; else d="$(srcdir)/"; fi; \
+	  echo "$$d$$p"; \
+	done | $(am__base_list) | \
+	while read files; do \
+	  echo " $(INSTALL_DATA) $$files '$(DESTDIR)$(pdfdir)'"; \
+	  $(INSTALL_DATA) $$files "$(DESTDIR)$(pdfdir)" || exit $$?; done
 install-ps: install-ps-recursive
 
-install-ps-am:
-
+install-ps-am: $(PSS)
+	@$(NORMAL_INSTALL)
+	@list='$(PSS)'; test -n "$(psdir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(psdir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(psdir)" || exit 1; \
+	fi; \
+	for p in $$list; do \
+	  if test -f "$$p"; then d=; else d="$(srcdir)/"; fi; \
+	  echo "$$d$$p"; \
+	done | $(am__base_list) | \
+	while read files; do \
+	  echo " $(INSTALL_DATA) $$files '$(DESTDIR)$(psdir)'"; \
+	  $(INSTALL_DATA) $$files "$(DESTDIR)$(psdir)" || exit $$?; done
 installcheck-am:
 
 maintainer-clean: maintainer-clean-recursive
@@ -1055,33 +1362,37 @@ maintainer-clean: maintainer-clean-recursive
 	-rm -rf $(top_srcdir)/autom4te.cache
 	-rm -rf ./$(DEPDIR)
 	-rm -f Makefile
-maintainer-clean-am: distclean-am maintainer-clean-generic
+maintainer-clean-am: distclean-am maintainer-clean-aminfo \
+	maintainer-clean-generic
 
 mostlyclean: mostlyclean-recursive
 
-mostlyclean-am: mostlyclean-compile mostlyclean-generic \
-	mostlyclean-libtool
+mostlyclean-am: mostlyclean-aminfo mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool
 
 pdf: pdf-recursive
 
-pdf-am:
+pdf-am: $(PDFS)
 
 ps: ps-recursive
 
-ps-am:
+ps-am: $(PSS)
 
-uninstall-am: uninstall-includeHEADERS uninstall-libLTLIBRARIES
+uninstall-am: uninstall-dvi-am uninstall-html-am \
+	uninstall-includeHEADERS uninstall-info-am \
+	uninstall-libLTLIBRARIES uninstall-pdf-am uninstall-ps-am
 
 .MAKE: $(am__recursive_targets) all install-am install-strip
 
 .PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
-	am--refresh check check-am clean clean-cscope clean-generic \
-	clean-libLTLIBRARIES clean-libtool clean-noinstLTLIBRARIES \
-	cscope cscopelist-am ctags ctags-am dist dist-all dist-bzip2 \
-	dist-gzip dist-lzip dist-shar dist-tarZ dist-xz dist-zip \
-	distcheck distclean distclean-compile distclean-generic \
-	distclean-hdr distclean-libtool distclean-tags distcleancheck \
-	distdir distuninstallcheck dvi dvi-am html html-am info \
+	am--refresh check check-am clean clean-aminfo clean-cscope \
+	clean-generic clean-libLTLIBRARIES clean-libtool \
+	clean-noinstLTLIBRARIES cscope cscopelist-am ctags ctags-am \
+	dist dist-all dist-bzip2 dist-gzip dist-info dist-lzip \
+	dist-shar dist-tarZ dist-xz dist-zip distcheck distclean \
+	distclean-compile distclean-generic distclean-hdr \
+	distclean-libtool distclean-tags distcleancheck distdir \
+	distuninstallcheck dvi dvi-am html html-am html-local info \
 	info-am install install-am install-data install-data-am \
 	install-dvi install-dvi-am install-exec install-exec-am \
 	install-html install-html-am install-includeHEADERS \
@@ -1089,14 +1400,25 @@ uninstall-am: uninstall-includeHEADERS uninstall-libLTLIBRARIES
 	install-man install-pdf install-pdf-am install-ps \
 	install-ps-am install-strip installcheck installcheck-am \
 	installdirs installdirs-am maintainer-clean \
-	maintainer-clean-generic mostlyclean mostlyclean-compile \
-	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
-	tags tags-am uninstall uninstall-am uninstall-includeHEADERS \
-	uninstall-libLTLIBRARIES
+	maintainer-clean-aminfo maintainer-clean-generic mostlyclean \
+	mostlyclean-aminfo mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool pdf pdf-am ps ps-am tags tags-am uninstall \
+	uninstall-am uninstall-dvi-am uninstall-html-am \
+	uninstall-includeHEADERS uninstall-info-am \
+	uninstall-libLTLIBRARIES uninstall-pdf-am uninstall-ps-am
 
 .PRECIOUS: Makefile
 
 
+@BUILD_INFO_TRUE@html-local: doc/sframe-spec/index.html
+@BUILD_INFO_TRUE@doc/sframe-spec/index.html: doc/sframe-spec.texi doc/$(am__dirstamp)
+@BUILD_INFO_TRUE@	$(AM_V_GEN)$(MAKEINFOHTML) $(AM_MAKEINFOHTMLFLAGS) $(MAKEINFOFLAGS) \
+@BUILD_INFO_TRUE@	  --split=node -I$(srcdir) --output doc/sframe-spec $(srcdir)/doc/sframe-spec.texi
+
+# Workaround bug in automake: it can't handle conditionally building info pages
+# since GNU projects normally include info pages in the source distributions.
+@BUILD_INFO_FALSE@doc/sframe-spec.info:
+
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.
 .NOEXPORT:
diff --git a/libsframe/configure.ac b/libsframe/configure.ac
index 1d6220e9626..60700b24daa 100644
--- a/libsframe/configure.ac
+++ b/libsframe/configure.ac
@@ -78,6 +78,27 @@ fi
 CROSS_COMPILE=$is_cross_compiler
 AC_SUBST([CROSS_COMPILE])
 
+dnl Check for makeinfo for building documentation
+build_info=
+AC_CHECK_PROGS([MAKEINFO], makeinfo, makeinfo, )
+if test "x$MAKEINFO" = "x"; then
+    MAKEINFO="@echo makeinfo missing; true"
+    build_info=
+else
+    BUILD_INFO=info
+    case "$MAKEINFO" in
+      */missing\ makeinfo*)
+	build_info=
+	AC_MSG_WARN([
+*** Makeinfo is missing. Info documentation will not be built.])
+        ;;
+      *)
+	build_info=yes
+	;;
+    esac
+fi
+AM_CONDITIONAL(BUILD_INFO, test "${build_info}" = yes)
+
 dnl The libsframebt library needs to be built with SFrame info.
 dnl If the build assembler is not capable of generate SFrame then
 dnl the library is not built.
diff --git a/libsframe/doc/local.mk b/libsframe/doc/local.mk
new file mode 100644
index 00000000000..bdd1312e040
--- /dev/null
+++ b/libsframe/doc/local.mk
@@ -0,0 +1,40 @@
+## Process this file with automake to produce Makefile.in.
+#
+#   Copyright (C) 2019-2022 Free Software Foundation, Inc.
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; see the file COPYING.  If not see
+# <http://www.gnu.org/licenses/>.
+#
+
+if BUILD_INFO
+
+info_TEXINFOS += %D%/sframe-spec.texi
+
+AM_MAKEINFOFLAGS = --no-split
+
+DISTCLEANFILES += texput.log
+MAINTAINERCLEANFILES += %D%/sframe-spec.info
+
+html-local: %D%/sframe-spec/index.html
+%D%/sframe-spec/index.html: %D%/sframe-spec.texi %D%/$(am__dirstamp)
+	$(AM_V_GEN)$(MAKEINFOHTML) $(AM_MAKEINFOHTMLFLAGS) $(MAKEINFOFLAGS) \
+	  --split=node -I$(srcdir) --output %D%/sframe-spec $(srcdir)/%D%/sframe-spec.texi
+
+else
+
+# Workaround bug in automake: it can't handle conditionally building info pages
+# since GNU projects normally include info pages in the source distributions.
+%D%/sframe-spec.info:
+
+endif
diff --git a/libsframe/doc/sframe-spec.texi b/libsframe/doc/sframe-spec.texi
new file mode 100644
index 00000000000..7e92c111b8f
--- /dev/null
+++ b/libsframe/doc/sframe-spec.texi
@@ -0,0 +1,614 @@
+\input texinfo       @c                    -*- Texinfo -*-
+@setfilename sframe-spec.info
+@settitle The SFrame Format
+@ifnottex
+@xrefautomaticsectiontitle on
+@end ifnottex
+
+@copying
+Copyright @copyright{} 2021-2022 Free Software Foundation, Inc.
+
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU General Public License, Version 3 or any
+later version published by the Free Software Foundation.  A copy of the
+license is included in the section entitled ``GNU General Public
+License''.
+
+@end copying
+
+@dircategory Software development
+@direntry
+* SFrame: (sframe-spec).         The Simple Frame format.
+@end direntry
+
+@titlepage
+@title The SFrame Format
+@subtitle Version 1
+@author Indu Bhagat
+
+@page
+@vskip 0pt plus 1filll
+@insertcopying
+@end titlepage
+@contents
+
+@ifnottex
+@node Top
+@top The SFrame format
+
+This manual describes version 1 of the SFrame file format.  SFrame stands for
+Simple Frame format.  SFrame format keeps track of the minimal necessary
+information needed for stack unwinding:
+
+@itemize @minus
+@item
+Canonical Frame Address (CFA).
+@item
+Frame Pointer (FP).
+@item
+Return Address (RA).
+@end itemize
+
+The reason for existence of the SFrame format is to support fast, online
+backtracing using a simple unwinder.
+
+@menu
+* Overview::
+* SFrame section::
+* Index::
+@end menu
+
+@end ifnottex
+
+@node Overview
+@unnumbered Overview
+@cindex Overview
+@tindex PT_GNU_SFRAME
+
+The SFrame unwind information is provided in a loaded section, known as the
+@code{.sframe} section.  When available, the @code{.sframe} section appears in
+a new segment of its own, PT_GNU_SFRAME.
+
+The SFrame format is currently supported only for select ABIs, namely, AMD64
+and AAPCS64.
+
+The contents of the SFrame section are stored in the target endianness, i.e.,
+in the endianness of the system on which the section is targetted to be used.
+An SFrame section reader may use the magic number in the SFrame header to
+identify the endianness of the SFrame section.
+
+Addresses in this specification are expressed in bytes.
+
+The associated API to decode, probe and encode the SFrame section, provided via
+@code{libsframe}, is not accompanied here at this time.  This will be added
+later.
+
+This document is intended to be in sync with the C code in @file{sframe.h}.
+Please report descrepancies between the two, if any.
+
+@node SFrame section
+@chapter SFrame section
+@cindex SFrame section
+
+The SFrame section consists of an SFrame header, starting with a preamble, and
+two other sub-sections, namely the SFrame Function Descriptor Entry (SFrame
+FDE) sub-section, and the SFrame Frame Row Entry (SFrame FRE) sub-section.
+
+@menu
+* SFrame Preamble::
+* SFrame Header::
+* SFrame Function Descriptor Entries::
+* SFrame Frame Row Entries::
+@end menu
+
+@node SFrame Preamble
+@section SFrame Preamble
+@cindex SFrame preamble
+
+The preamble is a 32-bit packed structure; the only part of the SFrame whose
+format cannot vary between versions.
+
+@example
+typedef struct sframe_preamble
+@{
+  uint16_t sfp_magic;
+  uint8_t sfp_version;
+  uint8_t sfp_flags;
+@} ATTRIBUTE_PACKED sframe_preamble;
+@end example
+
+All values are stored in the endianness of the target system for which the
+SFrame section is intended.  Further details:
+
+@multitable {Offset} {@code{uint8_t sfp_version}} {The magic number for SFrame section: 0xdee2.  Defined}
+@headitem Offset @tab Name @tab Description
+@item 0x00
+@tab @code{uint16_t sfp_magic}
+@tab The magic number for SFrame section: 0xdee2.  Defined as a macro @code{SFRAME_MAGIC}.
+@tindex SFRAME_MAGIC
+
+@item 0x02
+@tab @code{uint8_t sfp_version}
+@tab The version number of this SFrame section.  @xref{SFrame version}, for the
+set of valid values.  Current version is
+@code{SFRAME_VERSION_1}.
+
+@item 0x03
+@tab @code{uint8_t sfp_flags}
+@tab Flags (section-wide) for this SFrame section.  @xref{SFrame flags}, for the
+set of valid values.
+@end multitable
+
+@menu
+* SFrame endianness::
+* SFrame version::
+* SFrame flags::
+@end menu
+
+@node SFrame endianness
+@subsection SFrame endianness
+
+@cindex endianness
+SFrame sections are stored in the target endianness of the system that consumes
+them.  The SFrame library (@code{libsframe}) can, however, detect whether to
+endian-flip an SFrame section at decode time, by inspecting the
+@code{sfp_magic} field in the SFrame header (If it appears as 0xe2de,
+endian-flipping is needed).
+
+@node SFrame version
+@subsection SFrame version
+
+The version of the SFrame format can be determined by inspecting
+@code{sfp_version}.  The following versions are currently valid:
+
+@tindex SFRAME_VERSION_1
+@cindex SFrame versions
+@multitable {SFRAME_VERSION_1} {Number} {First version, under development.}
+@headitem Version @tab Number @tab Description
+@item @code{SFRAME_VERSION_1}
+@tab 1 @tab First version, under development.
+@end multitable
+
+This section documents @code{SFRAME_VERSION_1}.
+
+@node SFrame flags
+@subsection SFrame flags
+@cindex SFrame flags
+@comment @vindex sfp_flags
+@comment @vindex SFrame section-wide flags
+@comment @subsection SFrame section-wide flags
+
+The preamble contains bitflags in its @code{sfp_flags} field that
+describe various section-wide properties.
+
+The following flags are currently defined.
+
+@multitable {@code{SFRAME_F_FRAME_POINTER}} {Versions} {Value} {Function Descriptor Entries}
+@headitem Flag @tab Versions @tab Value @tab Meaning
+@tindex SFRAME_F_FDE_SORTED
+@item @code{SFRAME_F_FDE_SORTED} @tab All @tab 0x1 @tab Function Descriptor
+Entries are sorted on PC.
+@tindex SFRAME_F_FRAME_POINTER
+@item @code{SFRAME_F_FRAME_POINTER} @tab All @tab 0x2
+@tab Functions preserve frame-pointer.
+@end multitable
+
+Further flags may be added in future.
+
+@node SFrame Header
+@section SFrame Header
+@cindex SFrame header
+
+The SFrame header is the first part of an SFrame section.  It begins with the
+SFrame preamble.  All parts of it other than the preamble
+(@pxref{SFrame Preamble}) can vary between SFrame file versions.  It contains
+things that apply to the section as a whole, and offsets to the various other
+sub-sections defined in the format.  As with the rest of the SFrame section,
+all values are stored in the endianness of the target system.
+
+The two sub-sections tile the SFrame section: each section runs from the offset
+given until the start of the next section.  An explicit length is given for the
+last sub-section, the SFrame Frame Row Entry (SFrame FRE) sub-section.
+
+@example
+typedef struct sframe_header
+@{
+  sframe_preamble sfh_preamble;
+  uint8_t sfh_abi_arch;
+  int8_t sfh_cfa_fixed_fp_offset;
+  int8_t sfh_cfa_fixed_ra_offset;
+  uint8_t sfh_auxhdr_len;
+  uint32_t sfh_num_fdes;
+  uint32_t sfh_num_fres;
+  uint32_t sfh_fre_len;
+  uint32_t sfh_fdeoff;
+  uint32_t sfh_freoff;
+@} ATTRIBUTE_PACKED sframe_header;
+@end example
+
+The sub-section offsets, namely @code{sfh_fdeoff} and @code{sfh_freoff}, in the
+SFrame header are relative to the @emph{end} of the SFrame header; they are
+each an offset in bytes into the SFrame section where the SFrame FDE
+sub-section and the SFrame FRE sub-section respectively start.
+
+SFrame header allows specifying explicitly the fixed offsets from CFA, if any,
+from which FP or RA may be recovered.  For example, in AMD64, the stack offset
+of the return address is @code{CFA - 8}.  Since this offset is in close
+vicinity with the CFA in most ABIs, @code{sfh_cfa_fixed_fp_offset} and
+@code{sfh_cfa_fixed_ra_offset} are limited to signed 8-bit integers.
+
+SFrame format has provisioned for future ABIs/architectures that it may
+support.  The @code{sframe_header} structure provides an unsigned 8-bit
+integral field to denote the size of an auxilliary SFrame header.  The
+auxilliary SFrame header follows right after the @code{sframe_header}
+structure.  As for the offset calculations, the @emph{end} of SFrame header
+must be the end of the auxilliary SFrame header, if the latter is present.
+
+Tieing it all together:
+
+@multitable {Offset} {@code{int8_t sfh_cfa_fixed_fp_offset}} {The ABI/arch identifier. See above}
+@headitem Offset @tab Name @tab Description
+@item 0x00
+@tab @code{sframe_preamble sfh_preamble}
+@tab The SFrame preamble. @xref{SFrame Preamble}.
+
+@item 0x04
+@tab @code{uint8_t sfh_abi_arch}
+@tab The ABI/arch identifier.  @xref{SFrame ABI/arch identifier}.
+
+@item 0x05
+@tab @code{int8_t sfh_cfa_fixed_fp_offset}
+@tab The CFA fixed FP offset, if any.
+
+@item 0x06
+@tab @code{int8_t sfh_cfa_fixed_ra_offset}
+@tab The CFA fixed RA offset, if any.
+
+@item 0x07
+@tab @code{uint8_t sfh_auxhdr_len}
+@tab Size in bytes of the auxilliary header that follows the
+@code{sframe_header} structure.
+
+@item 0x08
+@tab @code{uint32_t sfh_num_fdes}
+@tab The number of SFrame FDEs in the section.
+
+@item 0xc
+@tab @code{uint32_t sfh_num_fres}
+@tab The number of SFrame FREs in the section.
+
+@item 0x10
+@tab @code{uint32_t sfh_fre_len}
+@tab The length in bytes of the SFrame FRE sub-section.
+
+@item 0x14
+@tab @code{uint32_t sfh_fdeoff}
+@tab The offset in bytes of the SFrame FDE sub-section.  This sub-section
+contains @code{sfh_num_fdes} number of fixed-length array elements.  The array
+element is of type SFrame function desciptor entry, each providing a
+high-level function description for backtracing.
+@xref{SFrame Function Descriptor Entries}.
+
+@item 0x18
+@tab @code{uint32_t sfh_freoff}
+@tab The offset in bytes of the SFrame FRE sub-section, the core of the SFrame
+section, which describes the unwind information using variable-length array
+elements. @xref{SFrame Frame Row Entries}.
+
+@end multitable
+
+@menu
+* SFrame ABI/arch identifier::
+@end menu
+
+@node SFrame ABI/arch identifier
+@subsection SFrame ABI/arch identifier
+@cindex SFrame ABI/arch identifier
+
+SFrame header identifies the ABI/arch of the target system for which the
+executable and it's unwind information is intended.  There are currently three
+identifiable ABI/arch values in the format.
+
+@multitable {SFRAME_ABI_AARCH64_ENDIAN_LITTLE} {Value} {@code{AARCH64 little-endian}}
+@headitem ABI/arch Identifier @tab Value @tab Description
+
+@tindex SFRAME_ABI_AARCH64_ENDIAN_BIG
+@item @code{SFRAME_ABI_AARCH64_ENDIAN_BIG}
+@tab 1 @tab AARCH64 big-endian
+
+@tindex SFRAME_ABI_AARCH64_ENDIAN_LITTLE
+@item @code{SFRAME_ABI_AARCH64_ENDIAN_LITTLE}
+@tab 2 @tab AARCH64 little-endian
+
+@tindex SFRAME_ABI_AMD64_ENDIAN_LITTLE
+@item @code{SFRAME_ABI_AMD64_ENDIAN_LITTLE}
+@tab 3 @tab AMD64 little-endian
+
+@end multitable
+
+The presence of an explicit identification of ABI/arch in SFrame may allow
+unwinders to make certain ABI-specific decisions.
+
+@node SFrame Function Descriptor Entries
+@section SFrame FDE
+@cindex SFrame FDE
+
+The SFrame Function Descriptor Entry sub-section is a sorted array of
+fixed-length SFrame function descriptor entries (SFrame FDEs).  Each SFrame FDE
+is a packed structure which contains information to describe a function's unwind
+information at a high-level.
+
+@example
+typedef struct sframe_func_desc_entry
+@{
+  int32_t sfde_func_start_address;
+  uint32_t sfde_func_size;
+  uint32_t sfde_func_start_fre_off;
+  uint32_t sfde_func_num_fres;
+  uint8_t sfde_func_info;
+@} ATTRIBUTE_PACKED sframe_func_desc_entry;
+@end example
+
+@code{sfde_func_start_fre_off} is the offset to the first SFrame FRE for the
+function.  This offset is relative to the @emph{end of the SFrame FDE}
+sub-section (unlike the offsets in the SFrame header, which are relative to the
+@emph{end} of the SFrame header).
+
+@code{sfde_func_info} is the "info word", containing information on the FRE
+type and the FDE type for the function @xref{The SFrame FDE info word}.
+
+Following table describes each component of the SFrame FDE structure:
+
+@multitable {Offset} {@code{uint32_t sfde_func_start_fre_off}} {The ABI/arch identifier. See above}
+@headitem Offset @tab Name @tab Description
+@item 0x00
+@tab @code{int32_t sfde_func_start_address}
+@tab Signed 32-bit integral field denoting the virtual memory address of the
+described function.
+
+@item 0x04
+@tab @code{uint32_t sfde_func_size}
+@tab Unsigned 32-bit integral field specifying the size of the function in
+bytes.
+
+@item 0x08
+@tab @code{uint32_t sfde_func_start_fre_off}
+@tab Unsigned 32-bit integral field specifying the offset in bytes of the
+function's first SFrame FRE in the SFrame section.
+
+@item 0x0c
+@tab @code{uint32_t sfde_func_num_fres}
+@tab Unsigned 32-bit integral field specifying the total number of SFrame FREs
+used for the function.
+
+@item 0x10
+@tab @code{uint8_t sfde_func_info}
+@tab The SFrame FDE info word. @xref{The SFrame FDE info word}.
+
+@end multitable
+
+@menu
+* The SFrame FDE info word::
+* The SFrame FDE types::
+* The SFrame FRE types::
+@end menu
+
+@cindex The SFrame FDE info word
+@node The SFrame FDE info word
+@subsection The SFrame FDE info word, sfde_func_info
+
+The info word is a bitfield split into three parts.  From MSB to LSB:
+
+@multitable {Bit offset} {@code{isroot}} {Length of variable-length data for this type (some kinds only).}
+@headitem Bit offset @tab Name @tab Description
+@item 7--5
+@tab @code{unused}
+@tab Unused bits.
+
+@item 4
+@tab @code{fdetype}
+@tab SFRAME_FDE_TYPE_PCMASK (1) or SFRAME_FDE_TYPE_PCINC (0). @xref{The SFrame FDE types}.
+
+@item 0--3
+@tab @code{fretype}
+@tab Choice of three SFrame FRE types. @xref{The SFrame FRE types}.
+@end multitable
+
+@node The SFrame FDE types
+@subsection The SFrame FDE types
+@tindex SFRAME_FDE_TYPE_PCMASK
+@tindex SFRAME_FDE_TYPE_PCINC
+
+SFrame format defines two types of FDE entries.  The choice of which SFrame FDE
+type to use is made based on the instruction patterns in the relevant program
+stub.
+
+An SFrame FDE of type @code{SFRAME_FDE_TYPE_PCINC} is an indication that the PCs in the
+FREs should be treated as increments in bytes.  This is used fo the the bulk of
+the executable code of a program, which contains instructions with no specific
+pattern.
+
+In contrast, an SFrame FDE of type @code{SFRAME_FDE_TYPE_PCMASK} is an
+indication that the PCs in the FREs should be treated as masks.  This type is
+useful for the cases where a small pattern of instructions in a program stub is
+used repeatedly for a specific functionality.  Typical usecases are pltN
+entries and trampolines.
+
+@multitable {Name of SFrame FDE type} {Value} {Unwinders perform a (PC >= FRE_START_ADDR)}
+@headitem Name of SFrame FDE type @tab Value @tab Description
+
+@item SFRAME_FDE_TYPE_PCINC
+@tab 0 @tab Unwinders perform a (PC >= FRE_START_ADDR) to look up a matching FRE.
+
+@item SFRAME_FDE_TYPE_PCMASK
+@tab 1 @tab  Unwinders perform a (PC & FRE_START_ADDR_AS_MASK >= FRE_START_ADDR_AS_MASK)
+to look up a matching FRE.
+
+@end multitable
+
+@node The SFrame FRE types
+@subsection The SFrame FRE types
+
+A real world application can have functions of size big and small.  SFrame
+format defines three types of SFrame FRE entries to represent the unwind
+information for such a variety of function sizes.  These representations vary
+in the number of bits needed to encode the start address offset in the SFrame
+FRE.
+
+The following constants are defined and used to identify the SFrame FRE types:
+
+@multitable {SFRAME_FRE_TYPE_ADDR1} {@code{Value}} {The start address offset of FRE is an}
+@headitem Name @tab Value @tab Description
+
+@tindex SFRAME_FRE_TYPE_ADDR1
+@item @code{SFRAME_FRE_TYPE_ADDR1}
+@tab 0
+@tab The start address offset (in bytes) of the SFrame FRE is an unsigned
+8-bit value.
+
+@tindex SFRAME_FRE_TYPE_ADDR2
+@item @code{SFRAME_FRE_TYPE_ADDR2}
+@tab 1
+@tab The start address offset (in bytes) of the SFrame FRE is an unsigned
+16-bit value.
+
+@tindex SFRAME_FRE_TYPE_ADDR4
+@item @code{SFRAME_FRE_TYPE_ADDR4}
+@tab 2
+@tab The start address offset (in bytes) of the SFrame FRE is an unsigned
+32-bit value.
+@end multitable
+
+A single function must use the same type of FRE throughout.  The choice of
+which SFrame FRE is used to encode the unwind information of a function, is
+stored in the @xref{The SFrame FDE info word}.
+
+@node SFrame Frame Row Entries
+@section SFrame FRE
+@cindex SFrame FRE
+
+The SFrame Frame Row Entry sub-section contains the core of the unwind
+information.
+
+An SFrame Frame Row Entry is a self-sufficient record containing SFrame unwind
+info for a range of contiguous addresses, starting at the specified offset from
+the start of the function.  Each SFrame Frame Row Entry is followed by S*N
+bytes, where:
+
+@itemize @minus
+@item
+@code{S} is the size of the stack frame offset for the FRE, and
+@item
+@code{N} is the number of stack frame offsets in the FRE
+@end itemize
+
+The stack offsets, following the FRE, are interpreted in order as follows:
+
+@itemize @minus
+@item
+offset1 (interpreted as CFA = @code{BASE_REG} + offset1)
+@item
+offset2 (interpreted as FP = CFA + offset2)
+@item
+offset3 (interpreted as RA = CFA + offset3)
+@end itemize
+
+The entities @code{S}, @code{N} and @code{BASE_REG} are identified using the
+SFrame FRE info word, a.k.a. the @code{sframe_fre_info}
+@xref{The SFrame FRE info word}.
+
+Following are the definitions of the allowed SFrame FRE:
+
+@example
+typedef struct sframe_frame_row_entry_addr1
+@{
+  uint8_t sfre_start_address;
+  sframe_fre_info sfre_info;
+@} ATTRIBUTE_PACKED sframe_frame_row_entry_addr1;
+@end example
+
+@example
+typedef struct sframe_frame_row_entry_addr2
+@{
+  uint16_t sfre_start_address;
+  sframe_fre_info sfre_info;
+@} ATTRIBUTE_PACKED sframe_frame_row_entry_addr2;
+@end example
+
+@example
+typedef struct sframe_frame_row_entry_addr4
+@{
+  uint32_t sfre_start_address;
+  sframe_fre_info sfre_info;
+@} ATTRIBUTE_PACKED sframe_frame_row_entry_addr4;
+@end example
+
+@code{sfre_start_address} is an unsigned 8-bit/16-bit/32-bit integral field
+identifies the start address of the range of program counters, for which the
+SFrame FRE applies.  The value encoded in the @code{sfre_start_address} field
+is the offset in bytes of the start address of the SFrame FRE, from the start
+address of the function.
+
+Further FRE types may be added in future.
+
+@menu
+* The SFrame FRE info word::
+@end menu
+
+@cindex The SFrame FRE info word
+@node The SFrame FRE info word
+@subsection The SFrame FRE info word, sfre_info
+
+The SFrame FRE info word is a bitfield split into four parts.  From MSB to LSB:
+
+@multitable {Bit offset} {@code{fre_cfa_base_reg_id}} {Size of stack offsets in bytes.  Valid values}
+@headitem Bit offset @tab Name @tab Description
+@item 7
+@tab @code{unused}
+@tab Unused bit.
+
+@item 5-6
+@tab @code{fre_offset_size}
+@tab Size of stack offsets in bytes.  Valid values are SFRAME_FRE_OFFSET_1B,
+SFRAME_FRE_OFFSET_2B, and SFRAME_FRE_OFFSET_4B.
+
+@item 1-4
+@tab @code{fre_offset_count}
+@tab A value of upto 3 is allowed to track all three of CFA, FP and RA.
+
+@item 0
+@tab @code{fre_cfa_base_reg_id}
+@tab Distinguish between SP or FP based CFA recovery.
+
+@end multitable
+
+@multitable {SFRAME_FRE_OFFSET_4B} {@code{Value}} {All stack offsets following the fixed-length}
+@headitem Name @tab Value @tab Description
+
+@tindex SFRAME_FRE_OFFSET_1B
+@item @code{SFRAME_FRE_OFFSET_1B}
+@tab 0
+@tab All stack offsets following the fixed-length FRE structure are 1 byte
+long.
+
+@tindex SFRAME_FRE_OFFSET_2B
+@item @code{SFRAME_FRE_OFFSET_2B}
+@tab 1
+@tab All stack offsets following the fixed-length FRE structure are 2 bytes
+long.
+
+@tindex SFRAME_FRE_OFFSET_4B
+@item @code{SFRAME_FRE_OFFSET_4B}
+@tab 2
+@tab All stack offsets following the fixed-length FRE structure are 4 bytes
+long.
+
+@end multitable
+
+@node Index
+@unnumbered Index
+
+@syncodeindex tp cp
+@printindex cp
+
+@bye
-- 
2.37.2