255 lines
7.0 KiB
Plaintext
255 lines
7.0 KiB
Plaintext
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This is a loose collection of notes for people hacking on simulators.
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If this document gets big enough it can be prettied up then.
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Contents
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- The "common" directory
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- Common Makefile Support
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- TAGS support
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- Generating "configure" files
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- tconfig.in
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- C Language Assumptions
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- "dump" commands under gdb
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The "common" directory
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======================
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The common directory contains:
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- common documentation files (e.g. run.1, and maybe in time .texi files)
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- common source files (e.g. run.c)
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- common Makefile fragment and configury (e.g. Make-common.in, aclocal.m4).
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In addition "common" contains portions of the system call support
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(e.g. callback.c, nltvals.def).
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Even though no files are built in this directory, it is still configured
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so support for regenerating nltvals.def is present.
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Common Makefile Support
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=======================
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A common configuration framework is available for simulators that want
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to use it. The common framework exists to remove a lot of duplication
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in configure.in and Makefile.in, and it also provides a foundation for
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enhancing the simulators uniformly (e.g. the more they share in common
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the easier a feature added to one is added to all).
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The configure.in of a simulator using the common framework should look like:
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--- snip ---
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dnl Process this file with autoconf to produce a configure script.
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sinclude(../common/aclocal.m4)
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AC_PREREQ(2.5)dnl
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AC_INIT(Makefile.in)
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SIM_AC_COMMON
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... target specific additions ...
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SIM_AC_OUTPUT
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--- snip ---
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SIM_AC_COMMON:
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- invokes the autoconf macros most often used by the simulators
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- defines --enable/--with options usable by all simulators
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- initializes sim_link_files/sim_link_links as the set of symbolic links
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to set up
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SIM_AC_OUTPUT:
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- creates the symbolic links defined in sim_link_{files,links}
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- creates config.h
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- creates the Makefile
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The Makefile.in of a simulator using the common framework should look like:
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--- snip ---
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# Makefile for blah ...
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# Copyright blah ...
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## COMMON_PRE_CONFIG_FRAG
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# These variables are given default values in COMMON_PRE_CONFIG_FRAG.
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# We override the ones we need to here.
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# Not all of these need to be mentioned, only the necessary ones.
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# In fact it is better to *not* mention ones if the value is the default.
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# List of object files, less common parts.
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SIM_OBJS =
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# List of extra dependencies.
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# Generally this consists of simulator specific files included by sim-main.h.
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SIM_EXTRA_DEPS =
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# List of flags to always pass to $(CC).
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SIM_EXTRA_CFLAGS =
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# List of extra libraries to link with.
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SIM_EXTRA_LIBS =
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# List of extra program dependencies.
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SIM_EXTRA_LIBDEPS =
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# List of main object files for `run'.
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SIM_RUN_OBJS = run.o
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# Dependency of `all' to build any extra files.
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SIM_EXTRA_ALL =
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# Dependency of `install' to install any extra files.
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SIM_EXTRA_INSTALL =
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# Dependency of `clean' to clean any extra files.
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SIM_EXTRA_CLEAN =
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## COMMON_POST_CONFIG_FRAG
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# Rules need to build $(SIM_OBJS), plus whatever else the target wants.
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... target specific rules ...
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--- snip ---
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COMMON_{PRE,POST}_CONFIG_FRAG are markers for SIM_AC_OUTPUT to tell it
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where to insert the two pieces of common/Make-common.in.
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The resulting Makefile is created by doing autoconf substitions on
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both the target's Makefile.in and Make-common.in, and inserting
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the two pieces of Make-common.in into the target's Makefile.in at
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COMMON_{PRE,POST}_CONFIG_FRAG.
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Note that SIM_EXTRA_{INSTALL,CLEAN} could be removed and "::" targets
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could be used instead. However, it's not clear yet whether "::" targets
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are portable enough.
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TAGS support
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============
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Many files generate program symbols at compile time.
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Such symbols can't be found with grep nor do they normally appear in
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the TAGS file. To get around this, source files can add the comment
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/* TAGS: foo1 foo2 */
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where foo1, foo2 are program symbols. Symbols found in such comments
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are greppable and appear in the TAGS file.
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Generating "configure" files
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============================
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For targets using the common framework, "configure" can be generated
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by running `autoconf'.
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To regenerate the configure files for all targets using the common framework:
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$ cd devo/sim
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$ make -f Makefile.in SHELL=/bin/sh autoconf-common
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To add a change-log entry to the ChangeLog file for each updated
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directory (WARNING - check the modified new-ChangeLog files before
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renaming):
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$ make -f Makefile.in SHELL=/bin/sh autoconf-changelog
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$ more */new-ChangeLog
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$ make -f Makefile.in SHELL=/bin/sh autoconf-install
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In a similar vein, both the configure and config.in files can be
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updated using the sequence:
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$ cd devo/sim
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$ make -f Makefile.in SHELL=/bin/sh autoheader-common
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$ make -f Makefile.in SHELL=/bin/sh autoheader-changelog
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$ more */new-ChangeLog
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$ make -f Makefile.in SHELL=/bin/sh autoheader-install
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tconfig.in
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==========
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File tconfig.in defines one or more target configuration macros
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(e.g. a tm.h file). There are very few that need defining.
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For a list of all of them, see common/tconfig.in.
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It contains them all, commented out.
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The intent is that a new port can just copy this file and
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define the ones it needs.
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C Language Assumptions
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======================
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The programmer may assume that the simulator is being built using an
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ANSI C compiler that supports a 64 bit data type. Consequently:
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o prototypes can be used (although using
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PARAMS() and K&R declarations wouldn't
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go astray).
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o If sim-types.h is included, the two
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types signed64 and unsigned64 are
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available.
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o The type `unsigned' is valid.
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However, the user should be aware of the following:
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o GCC's `<number>LL' is NOT acceptable.
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Microsoft-C doesn't reconize it.
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o MSC's `<number>i64' is NOT acceptable.
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GCC doesn't reconize it.
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o GCC's `long long' MSC's `_int64' can
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NOT be used to define 64 bit integer data
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types.
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o An empty array (eg int a[0]) is not valid.
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When building with GCC it is effectivly a requirement that
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--enable-build-warnings=,-Werror be specified during configuration.
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"dump" commands under gdb
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=========================
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gdbinit.in contains the following
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define dump
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set sim_debug_dump ()
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end
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Simulators that define the sim_debug_dump function can then have their
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internal state pretty printed from gdb.
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FIXME: This can obviously be made more elaborate. As needed it will be.
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Rebuilding nltvals.def
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======================
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Checkout a copy of the SIM and LIBGLOSS modules (Unless you've already
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got one to hand):
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$ mkdir /tmp/$$
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$ cd /tmp/$$
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$ cvs checkout sim-no-testsuite libgloss-no-testsuite newlib-no-testsuite
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Configure things for an arbitrary simulator target (I've d10v for
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convenience):
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$ mkdir /tmp/$$/build
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$ cd /tmp/$$/build
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$ /tmp/$$/devo/configure --target=d10v-elf
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In the sim/common directory rebuild the headers:
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$ cd sim/common
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$ make headers
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To add a new target:
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devo/sim/common/gennltvals.sh
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Add your new processor target (you'll need to grub
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around to find where your syscall.h lives).
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devo/sim/<processor>/Makefile.in
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Add the definition:
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``NL_TARGET = -DNL_TARGET_d10v''
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just before the line COMMON_POST_CONFIG_FRAG.
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devo/sim/<processor>/*.[ch]
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Include targ-vals.h instead of syscall.h.
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