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author | cvs2svn <> | 2002-02-28 16:50:42 +0300 |
---|---|---|
committer | cvs2svn <> | 2002-02-28 16:50:42 +0300 |
commit | 9ccf7d7a2bedae22e20a07e447a5123bb48318d5 (patch) | |
tree | 46ab57eaa486d43f88afb6012429f88086b81077 /libgloss/doc/porting.texi | |
parent | 062401c9b4bf8a203d7e694194307d84e351fce0 (diff) |
This commit was manufactured by cvs2svn to create tag 'predaemon'.predaemon
Sprout from master 2002-02-28 13:50:41 UTC Robert Collins <rbtcollins@hotmail.com> '2002-02-28 Robert Collins <rbtcollins@hotmail.com>'
Delete:
COPYING
COPYING.LIB
COPYING.NEWLIB
ChangeLog
MAINTAINERS
Makefile.in
README
README-maintainer-mode
config-ml.in
config.guess
config.if
config.sub
config/ChangeLog
config/acinclude.m4
config/mh-a68bsd
config/mh-aix386
config/mh-apollo68
config/mh-armpic
config/mh-cxux
config/mh-cygwin
config/mh-decstation
config/mh-delta88
config/mh-dgux
config/mh-dgux386
config/mh-djgpp
config/mh-elfalphapic
config/mh-hp300
config/mh-hpux
config/mh-hpux8
config/mh-i370pic
config/mh-ia64pic
config/mh-interix
config/mh-irix4
config/mh-irix5
config/mh-irix6
config/mh-lynxos
config/mh-lynxrs6k
config/mh-m68kpic
config/mh-mingw32
config/mh-ncr3000
config/mh-ncrsvr43
config/mh-necv4
config/mh-openedition
config/mh-papic
config/mh-ppcpic
config/mh-riscos
config/mh-s390pic
config/mh-sco
config/mh-solaris
config/mh-sparcpic
config/mh-sun3
config/mh-sysv
config/mh-sysv4
config/mh-sysv5
config/mh-vaxult2
config/mh-x86pic
config/mpw-mh-mpw
config/mpw/ChangeLog
config/mpw/MoveIfChange
config/mpw/README
config/mpw/forward-include
config/mpw/g-mpw-make.sed
config/mpw/mpw-touch
config/mpw/mpw-true
config/mpw/null-command
config/mpw/open-brace
config/mpw/tr-7to8-src
config/mpw/true
config/mt-aix43
config/mt-armpic
config/mt-d30v
config/mt-elfalphapic
config/mt-i370pic
config/mt-ia64pic
config/mt-linux
config/mt-m68kpic
config/mt-netware
config/mt-ospace
config/mt-papic
config/mt-ppcpic
config/mt-s390pic
config/mt-sparcpic
config/mt-v810
config/mt-wince
config/mt-x86pic
configure
configure.in
djunpack.bat
etc/ChangeLog
etc/Makefile.in
etc/add-log.el
etc/add-log.vi
etc/configbuild.ein
etc/configbuild.fig
etc/configbuild.jin
etc/configbuild.tin
etc/configdev.ein
etc/configdev.fig
etc/configdev.jin
etc/configdev.tin
etc/configure
etc/configure.in
etc/configure.texi
etc/fdl.texi
etc/make-stds.texi
etc/standards.texi
etc/texi2pod.pl
gettext.m4
include/COPYING
include/ChangeLog
include/MAINTAINERS
include/alloca-conf.h
include/ansidecl.h
include/aout/ChangeLog
include/aout/adobe.h
include/aout/aout64.h
include/aout/ar.h
include/aout/dynix3.h
include/aout/encap.h
include/aout/host.h
include/aout/hp.h
include/aout/hp300hpux.h
include/aout/hppa.h
include/aout/ranlib.h
include/aout/reloc.h
include/aout/stab.def
include/aout/stab_gnu.h
include/aout/sun4.h
include/bfdlink.h
include/bin-bugs.h
include/bout.h
include/callback.h
include/coff/ChangeLog
include/coff/a29k.h
include/coff/alpha.h
include/coff/apollo.h
include/coff/arm.h
include/coff/aux-coff.h
include/coff/ecoff.h
include/coff/external.h
include/coff/go32exe.h
include/coff/h8300.h
include/coff/h8500.h
include/coff/i386.h
include/coff/i860.h
include/coff/i960.h
include/coff/ia64.h
include/coff/internal.h
include/coff/m68k.h
include/coff/m88k.h
include/coff/mcore.h
include/coff/mips.h
include/coff/mipspe.h
include/coff/or32.h
include/coff/pe.h
include/coff/powerpc.h
include/coff/rs6000.h
include/coff/rs6k64.h
include/coff/sh.h
include/coff/sparc.h
include/coff/sym.h
include/coff/symconst.h
include/coff/ti.h
include/coff/tic30.h
include/coff/tic54x.h
include/coff/tic80.h
include/coff/w65.h
include/coff/we32k.h
include/coff/xcoff.h
include/coff/z8k.h
include/demangle.h
include/dis-asm.h
include/dyn-string.h
include/elf/ChangeLog
include/elf/alpha.h
include/elf/arc.h
include/elf/arm.h
include/elf/avr.h
include/elf/common.h
include/elf/cris.h
include/elf/d10v.h
include/elf/d30v.h
include/elf/dwarf.h
include/elf/dwarf2.h
include/elf/external.h
include/elf/fr30.h
include/elf/h8.h
include/elf/hppa.h
include/elf/i370.h
include/elf/i386.h
include/elf/i860.h
include/elf/i960.h
include/elf/ia64.h
include/elf/internal.h
include/elf/m32r.h
include/elf/m68hc11.h
include/elf/m68k.h
include/elf/mcore.h
include/elf/mips.h
include/elf/mmix.h
include/elf/mn10200.h
include/elf/mn10300.h
include/elf/openrisc.h
include/elf/or32.h
include/elf/pj.h
include/elf/ppc.h
include/elf/reloc-macros.h
include/elf/s390.h
include/elf/sh.h
include/elf/sparc.h
include/elf/v850.h
include/elf/x86-64.h
include/elf/xstormy16.h
include/fibheap.h
include/filenames.h
include/floatformat.h
include/fnmatch.h
include/fopen-bin.h
include/fopen-same.h
include/fopen-vms.h
include/gdbm.h
include/getopt.h
include/hashtab.h
include/hp-symtab.h
include/ieee.h
include/libiberty.h
include/md5.h
include/mpw/ChangeLog
include/mpw/README
include/mpw/dir.h
include/mpw/dirent.h
include/mpw/fcntl.h
include/mpw/grp.h
include/mpw/mpw.h
include/mpw/pwd.h
include/mpw/spin.h
include/mpw/stat.h
include/mpw/sys/file.h
include/mpw/sys/param.h
include/mpw/sys/resource.h
include/mpw/sys/stat.h
include/mpw/sys/time.h
include/mpw/sys/types.h
include/mpw/utime.h
include/mpw/varargs.h
include/nlm/ChangeLog
include/nlm/alpha-ext.h
include/nlm/common.h
include/nlm/external.h
include/nlm/i386-ext.h
include/nlm/internal.h
include/nlm/ppc-ext.h
include/nlm/sparc32-ext.h
include/oasys.h
include/objalloc.h
include/obstack.h
include/opcode/ChangeLog
include/opcode/a29k.h
include/opcode/alpha.h
include/opcode/arc.h
include/opcode/arm.h
include/opcode/avr.h
include/opcode/cgen.h
include/opcode/convex.h
include/opcode/cris.h
include/opcode/d10v.h
include/opcode/d30v.h
include/opcode/h8300.h
include/opcode/hppa.h
include/opcode/i370.h
include/opcode/i386.h
include/opcode/i860.h
include/opcode/i960.h
include/opcode/ia64.h
include/opcode/m68hc11.h
include/opcode/m68k.h
include/opcode/m88k.h
include/opcode/mips.h
include/opcode/mmix.h
include/opcode/mn10200.h
include/opcode/mn10300.h
include/opcode/np1.h
include/opcode/ns32k.h
include/opcode/or32.h
include/opcode/pdp11.h
include/opcode/pj.h
include/opcode/pn.h
include/opcode/ppc.h
include/opcode/pyr.h
include/opcode/s390.h
include/opcode/sparc.h
include/opcode/tahoe.h
include/opcode/tic30.h
include/opcode/tic54x.h
include/opcode/tic80.h
include/opcode/v850.h
include/opcode/vax.h
include/os9k.h
include/partition.h
include/progress.h
include/regs/ChangeLog
include/remote-sim.h
include/safe-ctype.h
include/sim-d10v.h
include/sort.h
include/splay-tree.h
include/symcat.h
include/ternary.h
include/xregex.h
include/xregex2.h
install-sh
libgloss/ChangeLog
libgloss/Makefile.in
libgloss/README
libgloss/arm/Makefile.in
libgloss/arm/coff-iq80310.specs
libgloss/arm/coff-redboot.ld
libgloss/arm/coff-redboot.specs
libgloss/arm/configure
libgloss/arm/configure.in
libgloss/arm/elf-iq80310.specs
libgloss/arm/elf-redboot.ld
libgloss/arm/elf-redboot.specs
libgloss/arm/redboot-crt0.S
libgloss/arm/redboot-syscalls.c
libgloss/close.c
libgloss/config/default.mh
libgloss/config/default.mt
libgloss/config/dos.mh
libgloss/config/mips.mt
libgloss/config/mn10200.mt
libgloss/config/mn10300.mt
libgloss/config/ppc.mh
libgloss/configure
libgloss/configure.in
libgloss/d30v/Makefile.in
libgloss/d30v/configure
libgloss/d30v/configure.in
libgloss/d30v/crt0.S
libgloss/d30v/inbyte.c
libgloss/d30v/outbyte.c
libgloss/d30v/syscalls.c
libgloss/debug.c
libgloss/debug.h
libgloss/doc/Makefile.in
libgloss/doc/configure
libgloss/doc/configure.in
libgloss/doc/porting.texi
libgloss/fr30/Makefile.in
libgloss/fr30/configure
libgloss/fr30/configure.in
libgloss/fr30/crt0.s
libgloss/fr30/syscalls.c
libgloss/fstat.c
libgloss/getpid.c
libgloss/glue.h
libgloss/hp74x/Makefile.in
libgloss/hp74x/README
libgloss/hp74x/checksum.c
libgloss/hp74x/configure
libgloss/hp74x/configure.in
libgloss/hp74x/crt0.s
libgloss/hp74x/debugger.h
libgloss/hp74x/debugger.s
libgloss/hp74x/diagnose.h
libgloss/hp74x/hppa-defs.h
libgloss/hp74x/hppa.ld
libgloss/hp74x/io.c
libgloss/hp74x/iva_table.h
libgloss/hp74x/iva_table.s
libgloss/hp74x/pa_stub.c
libgloss/hp74x/test.c
libgloss/i386/Makefile.in
libgloss/i386/configure
libgloss/i386/configure.in
libgloss/i386/cygmon-crt0.S
libgloss/i386/cygmon-gmon.c
libgloss/i386/cygmon-gmon.h
libgloss/i386/cygmon-salib.c
libgloss/i386/cygmon-syscall.h
libgloss/i386/cygmon.ld
libgloss/i960/Makefile.in
libgloss/i960/asm.h
libgloss/i960/configure
libgloss/i960/configure.in
libgloss/i960/crt0.c
libgloss/i960/mon-read.c
libgloss/i960/mon-syscalls.S
libgloss/i960/mon-write.c
libgloss/i960/mon960.c
libgloss/i960/mon960.ld
libgloss/i960/syscall.h
libgloss/isatty.c
libgloss/kill.c
libgloss/libnosys/Makefile.in
libgloss/libnosys/acconfig.h
libgloss/libnosys/close.c
libgloss/libnosys/config.h.in
libgloss/libnosys/configure
libgloss/libnosys/configure.in
libgloss/libnosys/environ.c
libgloss/libnosys/execve.c
libgloss/libnosys/fork.c
libgloss/libnosys/fstat.c
libgloss/libnosys/getpid.c
libgloss/libnosys/gettod.c
libgloss/libnosys/isatty.c
libgloss/libnosys/kill.c
libgloss/libnosys/link.c
libgloss/libnosys/lseek.c
libgloss/libnosys/open.c
libgloss/libnosys/read.c
libgloss/libnosys/sbrk.c
libgloss/libnosys/stat.c
libgloss/libnosys/times.c
libgloss/libnosys/unlink.c
libgloss/libnosys/wait.c
libgloss/libnosys/warning.h
libgloss/libnosys/write.c
libgloss/lseek.c
libgloss/m32r/Makefile.in
libgloss/m32r/chmod.c
libgloss/m32r/close.c
libgloss/m32r/configure
libgloss/m32r/configure.in
libgloss/m32r/crt0.S
libgloss/m32r/eit.h
libgloss/m32r/eva-stub.ld
libgloss/m32r/eva.ld
libgloss/m32r/exit.c
libgloss/m32r/fstat.c
libgloss/m32r/getpid.c
libgloss/m32r/isatty.c
libgloss/m32r/kill.c
libgloss/m32r/lseek.c
libgloss/m32r/m32r-lib.c
libgloss/m32r/mon.specs
libgloss/m32r/open.c
libgloss/m32r/raise.c
libgloss/m32r/read.c
libgloss/m32r/sbrk.c
libgloss/m32r/stat.c
libgloss/m32r/trap0.S
libgloss/m32r/trapmon0.c
libgloss/m32r/unlink.c
libgloss/m32r/utime.c
libgloss/m32r/write.c
libgloss/m68k/Makefile.in
libgloss/m68k/README
libgloss/m68k/asm.h
libgloss/m68k/bcc.ld
libgloss/m68k/configure
libgloss/m68k/configure.in
libgloss/m68k/cpu32bug.S
libgloss/m68k/cpu32bug.h
libgloss/m68k/crt0.S
libgloss/m68k/dbug-exit.S
libgloss/m68k/dbug-inbyte.S
libgloss/m68k/dbug-outbyte.S
libgloss/m68k/dtor.C
libgloss/m68k/idp-inbyte.c
libgloss/m68k/idp-outbyte.c
libgloss/m68k/idp.ld
libgloss/m68k/idpgdb.ld
libgloss/m68k/leds.c
libgloss/m68k/leds.h
libgloss/m68k/mc68681reg.h
libgloss/m68k/mc68ec.c
libgloss/m68k/mvme-stub.c
libgloss/m68k/mvme.S
libgloss/m68k/mvme135-asm.S
libgloss/m68k/mvme135.ld
libgloss/m68k/mvme162.ld
libgloss/m68k/mvme162lx-asm.S
libgloss/m68k/sbc5204.ld
libgloss/m68k/sbc5206.ld
libgloss/m68k/sim-abort.c
libgloss/m68k/sim-crt0.S
libgloss/m68k/sim-errno.c
libgloss/m68k/sim-funcs.c
libgloss/m68k/sim-inbyte.c
libgloss/m68k/sim-print.c
libgloss/m68k/sim-sbrk.c
libgloss/m68k/sim.ld
libgloss/m68k/simulator.S
libgloss/m68k/test.c
libgloss/mcore/Makefile.in
libgloss/mcore/close.c
libgloss/mcore/cmb-exit.c
libgloss/mcore/cmb-inbyte.c
libgloss/mcore/cmb-outbyte.c
libgloss/mcore/configure
libgloss/mcore/configure.in
libgloss/mcore/crt0.S
libgloss/mcore/elf-cmb.ld
libgloss/mcore/elf-cmb.specs
libgloss/mcore/fstat.c
libgloss/mcore/getpid.c
libgloss/mcore/kill.c
libgloss/mcore/lseek.c
libgloss/mcore/open.c
libgloss/mcore/pe-cmb.ld
libgloss/mcore/pe-cmb.specs
libgloss/mcore/print.c
libgloss/mcore/putnum.c
libgloss/mcore/raise.c
libgloss/mcore/read.c
libgloss/mcore/sbrk.c
libgloss/mcore/stat.c
libgloss/mcore/syscalls.S
libgloss/mcore/unlink.c
libgloss/mcore/write.c
libgloss/mips/Makefile.in
libgloss/mips/array-io.c
libgloss/mips/array.ld
libgloss/mips/cma101.c
libgloss/mips/configure
libgloss/mips/configure.in
libgloss/mips/crt0.S
libgloss/mips/ddb-kseg0.ld
libgloss/mips/ddb.ld
libgloss/mips/dtor.C
libgloss/mips/dve.ld
libgloss/mips/dvemon.c
libgloss/mips/entry.S
libgloss/mips/idt.ld
libgloss/mips/idt32.ld
libgloss/mips/idt64.ld
libgloss/mips/idtecoff.ld
libgloss/mips/idtmon.S
libgloss/mips/jmr3904-io.c
libgloss/mips/jmr3904app-java.ld
libgloss/mips/jmr3904app.ld
libgloss/mips/jmr3904dram-java.ld
libgloss/mips/jmr3904dram.ld
libgloss/mips/lsi.ld
libgloss/mips/lsi33k-stub.c
libgloss/mips/lsi33k-stub.h
libgloss/mips/lsipmon.S
libgloss/mips/nullmon.c
libgloss/mips/nullmon.ld
libgloss/mips/pmon.S
libgloss/mips/pmon.ld
libgloss/mips/regs.S
libgloss/mips/syscalls.c
libgloss/mips/test.c
libgloss/mips/vr4300.S
libgloss/mips/vr5xxx.S
libgloss/mn10200/Makefile.in
libgloss/mn10200/_exit.c
libgloss/mn10200/access.c
libgloss/mn10200/chmod.c
libgloss/mn10200/chown.c
libgloss/mn10200/close.c
libgloss/mn10200/configure
libgloss/mn10200/configure.in
libgloss/mn10200/creat.c
libgloss/mn10200/crt0.S
libgloss/mn10200/crt1.c
libgloss/mn10200/eval.ld
libgloss/mn10200/execv.c
libgloss/mn10200/execve.c
libgloss/mn10200/fork.c
libgloss/mn10200/fstat.c
libgloss/mn10200/getpid.c
libgloss/mn10200/gettime.c
libgloss/mn10200/isatty.c
libgloss/mn10200/kill.c
libgloss/mn10200/lseek.c
libgloss/mn10200/open.c
libgloss/mn10200/pipe.c
libgloss/mn10200/read.c
libgloss/mn10200/sbrk.c
libgloss/mn10200/sim.ld
libgloss/mn10200/stat.c
libgloss/mn10200/test.c
libgloss/mn10200/time.c
libgloss/mn10200/times.c
libgloss/mn10200/trap.S
libgloss/mn10200/trap.h
libgloss/mn10200/unlink.c
libgloss/mn10200/utime.c
libgloss/mn10200/wait.c
libgloss/mn10200/write.c
libgloss/mn10300/Makefile.in
libgloss/mn10300/_exit.c
libgloss/mn10300/access.c
libgloss/mn10300/chmod.c
libgloss/mn10300/chown.c
libgloss/mn10300/close.c
libgloss/mn10300/configure
libgloss/mn10300/configure.in
libgloss/mn10300/creat.c
libgloss/mn10300/crt0-eval.S
libgloss/mn10300/crt0.S
libgloss/mn10300/crt0_cygmon.S
libgloss/mn10300/crt0_redboot.S
libgloss/mn10300/crt1.c
libgloss/mn10300/cygmon.c
libgloss/mn10300/eval.ld
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libgloss/mn10300/getpid.c
libgloss/mn10300/gettime.c
libgloss/mn10300/isatty.c
libgloss/mn10300/kill.c
libgloss/mn10300/lseek.c
libgloss/mn10300/open.c
libgloss/mn10300/pipe.c
libgloss/mn10300/read.c
libgloss/mn10300/sbrk.c
libgloss/mn10300/sim.ld
libgloss/mn10300/stat.c
libgloss/mn10300/test.c
libgloss/mn10300/time.c
libgloss/mn10300/times.c
libgloss/mn10300/trap.S
libgloss/mn10300/trap.h
libgloss/mn10300/unlink.c
libgloss/mn10300/utime.c
libgloss/mn10300/wait.c
libgloss/mn10300/write.c
libgloss/open.c
libgloss/pa/Makefile.in
libgloss/pa/README
libgloss/pa/configure
libgloss/pa/configure.in
libgloss/pa/crt0.S
libgloss/pa/hp-milli.s
libgloss/pa/op50n-io.S
libgloss/pa/op50n.h
libgloss/pa/op50n.ld
libgloss/pa/op50nled.c
libgloss/pa/setjmp.S
libgloss/pa/test.c
libgloss/pa/w89k-io.c
libgloss/pa/w89k.h
libgloss/pa/w89k.ld
libgloss/print.c
libgloss/putnum.c
libgloss/read.c
libgloss/rs6000/Makefile.in
libgloss/rs6000/ads-exit.S
libgloss/rs6000/ads-io.c
libgloss/rs6000/ads.ld
libgloss/rs6000/configure
libgloss/rs6000/configure.in
libgloss/rs6000/crt0.S
libgloss/rs6000/mbx-exit.c
libgloss/rs6000/mbx-inbyte.c
libgloss/rs6000/mbx-outbyte.c
libgloss/rs6000/mbx-print.c
libgloss/rs6000/mbx.ld
libgloss/rs6000/mbx.specs
libgloss/rs6000/mcount.S
libgloss/rs6000/mvme-errno.c
libgloss/rs6000/mvme-exit.S
libgloss/rs6000/mvme-inbyte.S
libgloss/rs6000/mvme-outbyte.S
libgloss/rs6000/mvme-print.c
libgloss/rs6000/mvme-read.c
libgloss/rs6000/sim-abort.c
libgloss/rs6000/sim-crt0.S
libgloss/rs6000/sim-errno.c
libgloss/rs6000/sim-inbyte.c
libgloss/rs6000/sim-print.c
libgloss/rs6000/sim-sbrk.c
libgloss/rs6000/simulator.S
libgloss/rs6000/sol-cfuncs.c
libgloss/rs6000/sol-syscall.S
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winsup/w32api/include/winsock2.h
winsup/w32api/include/winspool.h
winsup/w32api/include/winsvc.h
winsup/w32api/include/winuser.h
winsup/w32api/include/winver.h
winsup/w32api/include/ws2tcpip.h
winsup/w32api/include/wsnetbs.h
winsup/w32api/include/wtypes.h
winsup/w32api/include/zmouse.h
winsup/w32api/install-sh
winsup/w32api/lib/Makefile.in
winsup/w32api/lib/advapi32.def
winsup/w32api/lib/cap.def
winsup/w32api/lib/comctl32.def
winsup/w32api/lib/comdlg32.def
winsup/w32api/lib/crypt32.def
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winsup/w32api/lib/dxguid.c
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winsup/w32api/lib/kernel32.c
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winsup/w32api/lib/mfcuia32.def
winsup/w32api/lib/mgmtapi.def
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winsup/w32api/lib/msacm32.def
winsup/w32api/lib/msvcp60.def
winsup/w32api/lib/mswsock.def
winsup/w32api/lib/nddeapi.def
winsup/w32api/lib/netapi32.def
winsup/w32api/lib/odbc32.def
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winsup/w32api/lib/ole32.def
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winsup/w32api/lib/opengl32.def
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winsup/w32api/lib/pkpd32.def
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winsup/w32api/lib/rpcdce4.def
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winsup/w32api/lib/scrnsave.c
winsup/w32api/lib/secur32.def
winsup/w32api/lib/setupapi.def
winsup/w32api/lib/shell32.c
winsup/w32api/lib/shell32.def
winsup/w32api/lib/svrapi.def
winsup/w32api/lib/tapi32.def
winsup/w32api/lib/test.c
winsup/w32api/lib/th32.def
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winsup/w32api/lib/url.def
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winsup/w32api/lib/uuid.c
winsup/w32api/lib/vdmdbg.def
winsup/w32api/lib/version.def
winsup/w32api/lib/vfw32.def
winsup/w32api/lib/win32spl.def
winsup/w32api/lib/wininet.def
winsup/w32api/lib/winmm.def
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winsup/w32api/lib/winstrm.def
winsup/w32api/lib/wow32.def
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diff --git a/libgloss/doc/porting.texi b/libgloss/doc/porting.texi deleted file mode 100644 index babc22eea..000000000 --- a/libgloss/doc/porting.texi +++ /dev/null @@ -1,2053 +0,0 @@ -\input texinfo @c -*- Texinfo -*- -@setfilename porting.info -@settitle Embed with GNU - -@c -@c This file documents the process of porting the GNU tools to an -@c embedded environment. -@c - -@finalout -@setchapternewpage off -@iftex -@raggedbottom -@global@parindent=0pt -@end iftex - -@titlepage -@title Embed With GNU -@subtitle Porting The GNU Tools To Embedded Systems -@sp 4 -@subtitle Spring 1995 -@subtitle Very *Rough* Draft -@author Rob Savoye - Cygnus Support -@page - -@vskip 0pt plus 1filll -Copyright @copyright{} 1993, 1994, 1995 Cygnus Support - -Permission is granted to make and distribute verbatim copies of -this manual provided the copyright notice and this permission notice -are preserved on all copies. - -Permission is granted to copy and distribute modified versions of this -manual under the conditions for verbatim copying, provided also that -the entire resulting derived work is distributed under the terms of a -permission notice identical to this one. - -Permission is granted to copy and distribute translations of this manual -into another language, under the above conditions for modified versions. -@end titlepage - -@ifinfo -@format -START-INFO-DIR-ENTRY -* Embed with GNU: (porting-). Embed with GNU -END-INFO-DIR-ENTRY -@end format -Copyright (c) 1993, 1994, 1995 Cygnus Support - -Permission is granted to make and distribute verbatim copies of -this manual provided the copyright notice and this permission notice -are preserved on all copies. - -Permission is granted to copy and distribute modified versions of this -manual under the conditions for verbatim copying, provided also that -the entire resulting derived work is distributed under the terms of a -permission notice identical to this one. - -Permission is granted to copy and distribute translations of this manual -into another language, under the above conditions for modified versions. - -@node Top -@top Embed with GNU - -@end ifinfo -@strong{Rough Draft} - -The goal of this document is to gather all the information needed to -port the GNU tools to a new embedded target in one place. This will -duplicate some info found in the other manual for the GNU tools, but -this should be all you'll need. - -@menu -* Libgloss:: Libgloss, a library of board support packages. -* GCC:: Porting GCC/G++ to a new embedded target. -* Libraries:: Making Newlib run on an new embedded target. -* GDB:: Making GDB understand a new back end. -* Binutils:: Using the GNU binary utilities. -* Code Listings:: Listings of the commented source code from the - text. -@end menu - -@node Libgloss, GCC, Top, Top -@chapter Libgloss -Libgloss is a library for all the details that usually get glossed over. -This library refers to things like startup code, and usually I/O support -for @code{gcc} and @code{C library}. The C library used through out -this manual is @code{newlib}. Newlib is a ANSI conforming C library -developed by Cygnus Support. Libgloss could easily be made to -support other C libraries, and it can be used standalone as well. The -standalone configuration is typically used when bringing up new -hardware, or on small systems. - -For a long time, these details were part of newlib. This approach worked -well when a complete tool chain only had to support one system. A tool -chain refers to the series of compiler passes required to produce a -binary file that will run on an embedded system. For C, the passes are -cpp, gcc, gas, ld. Cpp is the preprocessor, which process all the header -files and macros. Gcc is the compiler, which produces assembler from the -processed C files. Gas assembles the code into object files, and then ld -combines the object files and binds the code to addresses and produces -the final executable image. - -Most of the time a tool chain does only have to support one target -execution environment. An example of this would be a tool chain for the -AMD 29k processor family. All of the execution environments for this -processor are have the same interface, the same memory map, and the same -I/O code. In this case all of the support code is in newlib/sys/FIXME. -Libgloss's creation was forced initially be the @code{cpu32} processor -family. There are many different execution environments for this line, -and they vary wildly. newlib itself has only has a few dependencies that -it needs for each target. These are explained later in this doc. The -hardware dependent part of newlib was reorganized into a separate -directory structure within newlib called the stub dirs. It was initially -called this because most of the routines newlib needs for a target were -simple stubs that do nothing, but return a value to the application. They -only exist so the linker can produce a final executable image. This work -was done during the early part of 1993. - -After a while it became apparent that this approach of isolating the -hardware and systems files together made sense. Around this same time -the stub dirs were made to run standalone, mostly so it could also be -used to support GDB's remote debugging needs. At this time it was -decided to move the stub dirs out of newlib and into it's own separate -library so it could be used standalone, and be included in various other -GNU tools without having to bring in all of newlib, which is large. The -new library is called Libgloss, for Gnu Low-level OS support. - -@menu -* Supported targets:: What targets libgloss currently - supports. -* Building libgloss:: How to configure and built libgloss - for a target. -@end menu - -@node Supported targets, Building libgloss, Libgloss, Libgloss -@subsection Supported Targets -Currently libgloss is being used for the following targets: - -@menu -* Sparclite:: Fujitsu's sparclite. -* CPU32:: Various m68k based targets. -* Mips:: Mips code based targets. -* PA-RISC:: Precision Risc Organization.. -@end menu - -@node Sparclite, CPU32, , Supported targets -@subsection Sparclite Targets Supported -@c FIXME: put links to the docs in etc/targetdoc -This is for the Fujitsu Sparclite family of processors. Currently this -covers the ex930, ex931, ex932, ex933, and the ex934. In addition to the -I/O code a startup file, this has a GDB debug-stub that gets linked into -your application. This is an exception handler style debug stub. For -more info, see the section on Porting GDB. @ref{GDB,,Porting GDB}. - -The Fujitsu eval boards use a host based terminal program to load and -execute programs on the target. This program, @code{pciuh} is relatively -new (in 1994) and it replaced the previous ROM monitor which had the -shell in the ROM. GDB uses the the GDB remote protocol, the relevant -source files from the gdb sources are remote-sparcl.c. The debug stub is -part of libgloss and is called sparcl-stub.c. - -@node CPU32, Mips, Sparclite, Supported targets -@subsection Motorola CPU32 Targets supported -This refers to Motorola's m68k based CPU32 processor family. The crt0.S -startup file should be usable with any target environment, and it's -mostly just the I/O code and linker scripts that vary. Currently there -is support for the Motorola MVME line of 6U VME boards and IDP -line of eval boards. All of the -Motorola VME boards run @code{Bug}, a ROM based debug monitor. -This monitor has the feature of using user level traps to do I/O, so -this code should be portable to other MVME boards with little if any -change. The startup file also can remain unchanged. About the only thing -that varies is the address for where the text section begins. This can -be accomplished either in the linker script, or on the command line -using the @samp{-Ttext [address]}. - -@c FIXME: Intermetrics or ISI wrote rom68k ? -There is also support for the @code{rom68k} monitor as shipped on -Motorola's IDP eval board line. This code should be portable across the -range of CPU's the board supports. There is also GDB support for this -target environment in the GDB source tree. The relevant files are -gdb/monitor.c, monitor.h, and rom58k-rom.c. The usage of these files is -discussed in the GDB section. - -@node Mips, PA-RISC, CPU32, Supported targets -@subsection Mips core Targets Supported -The Crt0 startup file should run on any mips target that doesn't require -additional hardware initialization. The I/O code so far only supports a -custom LSI33k based RAID disk controller board. It should easy to -change to support the IDT line of eval boards. Currently the two -debugging protocols supported by GDB for mips targets is IDT's mips -debug protocol, and a customized hybrid of the standard GDB remote -protocol and GDB's standard ROM monitor support. Included here is the -debug stub for the hybrid monitor. This supports the LSI33k processor, -and only has support for the GDB protocol commands @code{g}, @code{G}, -@code{m}, @code{M}, which basically only supports the register and -memory reading and writing commands. This is part of libgloss and is -called lsi33k-stub.c. - -The crt0.S should also work on the IDT line of eval boards, but has only -been run on the LSI33k for now. There is no I/O support for the IDT eval -board at this time. The current I/O code is for a customized version of -LSI's @code{pmon} ROM monitor. This uses entry points into the monitor, -and should easily port to other versions of the pmon monitor. Pmon is -distributed in source by LSI. - -@node PA-RISC, , Mips, Supported targets -@subsection PA-RISC Targets Supported -This supports the various boards manufactured by the HP-PRO consortium. -This is a group of companies all making variations on the PA-RISC -processor. Currently supported are ports to the WinBond @samp{Cougar} -board based around their w89k version of the PA. Also supported is the -Oki op50n processor. - -There is also included, but never built an unfinished port to the HP 743 -board. This board is the main CPU board for the HP700 line of industrial -computers. This target isn't exactly an embedded system, in fact it's -really only designed to load and run HP-UX. Still, the crt0.S and I/O -code are fully working. It is included mostly because their is a barely -functioning exception handler GDB debug stub, and I hope somebody could -use it. The other PRO targets all use GDB's ability to talk to ROM -monitors directly, so it doesn't need a debug stub. There is also a -utility that will produce a bootable file by HP's ROM monitor. This is -all included in the hopes somebody else will finish it. :-) - -Both the WinBond board and the Oki board download srecords. The WinBond -board also has support for loading the SOM files as produced by the -native compiler on HP-UX. WinBond supplies a set of DOS programs that -will allow the loading of files via a bidirectional parallel port. This -has never been tested with the output of GNU SOM, as this manual is -mostly for Unix based systems. - -@node Building libgloss, , Supported targets, Libgloss -@subsection Configuring and building libgloss. - -Libgloss uses an autoconf based script to configure. Autoconf scripts -are portable shell scripts that are generated from a configure.in file. -Configure input scripts are based themselves on m4. Most configure -scripts run a series of tests to determine features the various -supported features of the target. For features that can't be determined -by a feature test, a makefile fragment is merged in. The configure -process leaves creates a Makefile in the build directory. For libgloss, -there are only a few configure options of importance. These are --target -and --srcdir. - -Typically libgloss is built in a separate tree just for objects. In this -manner, it's possible to have a single source tree, and multiple object -trees. If you only need to configure for a single target environment, -then you can configure in the source tree. The argument for --target is -a config string. It's usually safest to use the full canonical opposed -to the target alias. So, to configure for a CPU32 (m68k) with a separate -source tree, use: - -@smallexample -../src/libgloss/configure --verbose --target m68k-coff -@end smallexample - -The configure script is in the source tree. When configure is invoked -it will determine it's own source tree, so the --srcdir is would be -redundant here. - -Once libgloss is configured, @code{make} is sufficient to build it. The -default values for @code{Makefiles} are typically correct for all -supported systems. The test cases in the testsuite will also built -automatically as opposed to a @code{make check}, where test binaries -aren't built till test time. This is mostly cause the libgloss -testsuites are the last thing built when building the entire GNU source -tree, so it's a good test of all the other compilation passes. - -The default values for the Makefiles are set in the Makefile fragment -merged in during configuration. This fragment typically has rules like - -@smallexample -CC_FOR_TARGET = `if [ -f $$@{OBJROOT@}/gcc/xgcc ] ; \ - then echo $@{OBJROOT@}/gcc/xgcc -B$@{OBJROOT@}/gcc/ ; \ - else t='$@{program_transform_name@}'; echo gcc | sed -e '' $$t ; fi` -@end smallexample - -Basically this is a runtime test to determine whether there are freshly -built executables for the other main passes of the GNU tools. If there -isn't an executable built in the same object tree, then -@emph{transformed}the generic tool name (like gcc) is transformed to the -name typically used in GNU cross compilers. The names are -typically based on the target's canonical name, so if you've configured -for @code{m68k-coff} the transformed name is @code{m68k-coff-gcc} in -this case. If you install with aliases or rename the tools, this won't -work, and it will always look for tools in the path. You can force the a -different name to work by reconfiguring with the -@code{--program-transform-name} option to configure. This option takes a -sed script like this @code{-e s,^,m68k-coff-,} which produces tools -using the standard names (at least here at Cygnus). - -The search for the other GNU development tools is exactly the same idea. -This technique gets messier when build options like @code{-msoft-float} -support are used. The Makefile fragments set the @code{MUTILIB} -variable, and if it is set, the search path is modified. If the linking -is done with an installed cross compiler, then none of this needs to be -used. This is done so libgloss will build automatically with a fresh, -and uninstalled object tree. It also makes it easier to debug the other -tools using libgloss's test suites. - -@node GCC, Libraries, Libgloss, Top -@chapter Porting GCC - -Porting GCC requires two things, neither of which has anything to do -with GCC. If GCC already supports a processor type, then all the work in -porting GCC is really a linker issue. All GCC has to do is produce -assembler output in the proper syntax. Most of the work is done by the -linker, which is described elsewhere. - -Mostly all GCC does is format the command line for the linker pass. The -command line for GCC is set in the various config subdirectories of gcc. -The options of interest to us are @code{CPP_SPEC} and -@code{STARTFILE_SPEC}. CPP_SPEC sets the builtin defines for your -environment. If you support multiple environments with the same -processor, then OS specific defines will need to be elsewhere. -@c FIXME: Check these names - -@code{STARTFILE_SPEC} - -Once you have linker support, GCC will be able to produce a fully linked -executable image. The only @emph{part} of GCC that the linker wants is a -crt0.o, and a memory map. If you plan on running any programs that do -I/O of any kind, you'll need to write support for the C library, which -is described elsewhere. - -@menu -* Overview:: An overview as to the compilation passes. -* Options:: Useful GCC options for embedded systems. -@end menu - -@node Overview, Options, , GCC -@subsection Compilation passes - -GCC by itself only compiles the C or C++ code into assembler. Typically -GCC invokes all the passes required for you. These passes are cpp, cc1, -gas, ld. @code{cpp} is the C preprocessor. This will merge in the -include files, expand all macros definitions, and process all the -@code{#ifdef} sections. To see the output of ccp, invoke gcc with the -@code{-E} option, and the preprocessed file will be printed on the -stdout. cc1 is the actual compiler pass that produces the assembler for -the processed file. GCC is actually only a driver program for all the -compiler passes. It will format command line options for the other passes. -The usual command line GCC uses for the final link phase will have LD -link in the startup code and additional libraries by default. - -GNU AS started it's life to only function as a compiler pass, but -these days it can also be used as a source level assembler. When used as -a source level assembler, it has a companion assembler preprocessor -called @code{gasp}. This has a syntax similar to most other assembler -macros packages. GAS emits a relocatable object file from the assembler -source. The object file contains the executable part of the application, -and debug symbols. - -LD is responsible for resolving the addresses and symbols to something -that will be fully self-contained. Some RTOS's use relocatable object -file formats like @code{a.out}, but more commonly the final image will -only use absolute addresses for symbols. This enables code to be burned -into PROMS as well. Although LD can produce an executable image, there -is usually a hidden object file called @code{crt0.o} that is required as -startup code. With this startup code and a memory map, the executable -image will actually run on the target environment. @ref{Crt0,,Startup -Files}. - -The startup code usually defines a special symbol like @code{_start} -that is the default base address for the application, and the first -symbol in the executable image. If you plan to use any routines from the -standard C library, you'll also need to implement the functions that -this library is dependent on. @ref{Libraries,,Porting Newlib}. - -@node Options, , Overview, GCC -@c FIXME: Need stuff here about -fpic, -Ttext, etc... - -Options for the various development tools are covered in more detail -elsewhere. Still, the amount of options can be an overwhelming amount of -stuff, so the options most suited to embedded systems are summarized -here. If you use GCC as the main driver for all the passes, most of the -linker options can be passed directly to the compiler. There are also -GCC options that control how the GCC driver formats the command line -arguments for the linker. - -@menu -* GCC Options:: Options for the compiler. -* GAS Options:: Options for the assembler. -* LD Options:: Options for the linker. -@end menu - -@node GCC Options, GAS Options, , Options -Most of the GCC options that we're interested control how the GCC driver -formats the options for the linker pass. - -@c FIXME: this section is still under work. -@table @code -@item -nostartfiles -@item -nostdlib -@item -Xlinker -Pass the next option directly to the linker. - -@item -v -@item -fpic -@end table - -@node GAS Options, LD Options, GCC Options, Options -@c FIXME: Needs stuff here - -@node LD Options, , GAS Options, Options -@c FIXME: Needs stuff here - - -@node Libraries, GDB, GCC, Top -@chapter Porting newlib - -@menu -* Crt0:: Crt0.S. -* Linker Scripts:: Linker scripts for memory management. -* What to do now:: Tricks for manipulating formats. -* Libc:: Making libc work. -@end menu - -@node Crt0, Linker Scripts, , Libraries -@section Crt0, the main startup file - -To make a program that has been compiled with GCC to run, you -need to write some startup code. The initial piece of startup code is -called a crt0. (C RunTime 0) This is usually written in assembler, and -it's object gets linked in first, and bootstraps the rest of the -application when executed. This file needs to do the following things. - -@enumerate -@item -Initialize anything that needs it. This init section varies. If you are -developing an application that gets download to a ROM monitor, then -there is usually no need for any special initialization. The ROM monitor -handles it for you. - -If you plan to burn your code in a ROM, then the crt0 typically has to -do all the hardware initialization that is required to run an -application. This can include things like initializing serial ports or -run a memory check. It all depends on the hardware. - -@item -Zero the BSS section. This is for uninitialized data. All the addresses in -this section need to be initialized to zero so that programs that forget -to check new variables default value will get unpredictable results. - -@item -Call main() -This is what basically starts things running. If your ROM monitor -supports it, then first setup argc and argv for command line arguments -and an environment pointer. Then branch to main(). For G++ the the main -routine gets a branch to __main inserted by the code generator at the -very top. __main() is used by G++ to initialize it's internal tables. -__main() then returns back to your original main() and your code gets -executed. - -@item -Call exit() -After main() has returned, you need to cleanup things and return control -of the hardware from the application. On some hardware, there is nothing -to return to, especially if your program is in ROM. Sometimes the best -thing to do in this case is do a hardware reset, or branch back to the -start address all over again. - -When there is a ROM monitor present, usually a user trap can be called -and then the ROM takes over. Pick a safe vector with no side -effects. Some ROMs have a builtin trap handler just for this case. -@end enumerate -portable between all the m68k based boards we have here. -@ref{crt0.S,,Example Crt0.S}. - - -@smallexample -/* ANSI concatenation macros. */ - -#define CONCAT1(a, b) CONCAT2(a, b) -#define CONCAT2(a, b) a ## b -@end smallexample -These we'll use later. - -@smallexample -/* These are predefined by new versions of GNU cpp. */ - -#ifndef __USER_LABEL_PREFIX__ -#define __USER_LABEL_PREFIX__ _ -#endif - -/* Use the right prefix for global labels. */ -#define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x) - -@end smallexample - -These macros are to make this code portable between both @emph{COFF} and -@emph{a.out}. @emph{COFF} always has an @var{_ (underline)} prepended on -the front of all global symbol names. @emph{a.out} has none. - -@smallexample -#ifndef __REGISTER_PREFIX__ -#define __REGISTER_PREFIX__ -#endif - -/* Use the right prefix for registers. */ -#define REG(x) CONCAT1 (__REGISTER_PREFIX__, x) - -#define d0 REG (d0) -#define d1 REG (d1) -#define d2 REG (d2) -#define d3 REG (d3) -#define d4 REG (d4) -#define d5 REG (d5) -#define d6 REG (d6) -#define d7 REG (d7) -#define a0 REG (a0) -#define a1 REG (a1) -#define a2 REG (a2) -#define a3 REG (a3) -#define a4 REG (a4) -#define a5 REG (a5) -#define a6 REG (a6) -#define fp REG (fp) -#define sp REG (sp) -@end smallexample - -This is for portability between assemblers. Some register names have a -@var{%} or @var{$} prepended to the register name. - -@smallexample -/* - * Set up some room for a stack. We just grab a chunk of memory. - */ - .set stack_size, 0x2000 - .comm SYM (stack), stack_size -@end smallexample - -Set up space for the stack. This can also be done in the linker script, -but it typically gets done here. - -@smallexample -/* - * Define an empty environment. - */ - .data - .align 2 -SYM (environ): - .long 0 -@end smallexample - -Set up an empty space for the environment. This is bogus on any most ROM -monitor, but we setup a valid address for it, and pass it to main. At -least that way if an application checks for it, it won't crash. - -@smallexample - .align 2 - .text - .global SYM (stack) - - .global SYM (main) - .global SYM (exit) -/* - * This really should be __bss_start, not SYM (__bss_start). - */ - .global __bss_start -@end smallexample - -Setup a few global symbols that get used elsewhere. @var{__bss_start} -needs to be unchanged, as it's setup by the linker script. - -@smallexample -/* - * start -- set things up so the application will run. - */ -SYM (start): - link a6, #-8 - moveal #SYM (stack) + stack_size, sp - -/* - * zerobss -- zero out the bss section - */ - moveal #__bss_start, a0 - moveal #SYM (end), a1 -1: - movel #0, (a0) - leal 4(a0), a0 - cmpal a0, a1 - bne 1b -@end smallexample - -The global symbol @code{start} is used by the linker as the default -address to use for the @code{.text} section. then it zeros the -@code{.bss} section so the uninitialized data will all be cleared. Some -programs have wild side effects from having the .bss section let -uncleared. Particularly it causes problems with some implementations of -@code{malloc}. - -@smallexample -/* - * Call the main routine from the application to get it going. - * main (argc, argv, environ) - * We pass argv as a pointer to NULL. - */ - pea 0 - pea SYM (environ) - pea sp@@(4) - pea 0 - jsr SYM (main) - movel d0, sp@@- -@end smallexample - -Setup the environment pointer and jump to @code{main()}. When -@code{main()} returns, it drops down to the @code{exit} routine below. - -@smallexample -/* - * _exit -- Exit from the application. Normally we cause a user trap - * to return to the ROM monitor for another run. - */ -SYM (exit): - trap #0 -@end smallexample - -Implementing @code{exit} here is easy. Both the @code{rom68k} and @code{bug} -can handle a user caused exception of @code{zero} with no side effects. -Although the @code{bug} monitor has a user caused trap that will return -control to the ROM monitor, this solution has been more portable. - -@node Linker Scripts, What to do now, Crt0, Libraries -@section Linker scripts for memory management - -The linker script sets up the memory map of an application. It also -sets up default values for variables used elsewhere by sbrk() and the -crt0. These default variables are typically called @code{_bss_start} and -@code{_end}. - -For G++, the constructor and destructor tables must also be setup here. -The actual section names vary depending on the object file format. For -@code{a.out} and @code{coff}, the three main sections are @code{.text}, -@code{.data}, and @code{.bss}. - -Now that you have an image, you can test to make sure it got the -memory map right. You can do this by having the linker create a memory -map (by using the @code{-Map} option), or afterwards by using @code{nm} to -check a few critical addresses like @code{start}, @code{bss_end}, and -@code{_etext}. - -Here's a breakdown of a linker script for a m68k based target board. -See the file @code{libgloss/m68k/idp.ld}, or go to the appendixes in -the end of the manual. @ref{idp.ld,,Example Linker Script}. - -@smallexample -STARTUP(crt0.o) -OUTPUT_ARCH(m68k) -INPUT(idp.o) -SEARCH_DIR(.) -__DYNAMIC = 0; -@end smallexample - -The @code{STARTUP} command loads the file specified so that it's -first. In this case it also doubles to load the file as well, because -the m68k-coff configuration defaults to not linking in the crt0.o by -default. It assumes that the developer probably has their own crt0.o. -This behavior is controlled in the config file for each architecture. -It's a macro called @code{STARTFILE_SPEC}, and if it's set to -@code{null}, then when @code{gcc} formats it's command line, it doesn't -add @code{crto.o}. Any file name can be specified here, but the default -is always @code{crt0.o}. - -Course if you only use @code{ld} to link, then the control of whether or -not to link in @code{crt0.o} is done on the command line. If you have -multiple crto files, then you can leave this out all together, and link -in the @code{crt0.o} in the makefile, or by having different linker -scripts. Sometimes this is done for initializing floating point -optionally, or to add device support. - -The @code{OUTPUT_ARCH} sets architecture the output file is for. - -@code{INPUT} loads in the file specified. In this case, it's a relocated -library that contains the definitions for the low-level functions need -by libc.a. This could have also been specified on the command line, but -as it's always needed, it might as well be here as a default. -@code{SEARCH_DIR} specifies the path to look for files, and -@code{_DYNAMIC} means in this case there are no shared libraries. - -@c FIXME: Check the linker manual to make sure this is accurate. -@smallexample -/* - * Setup the memory map of the MC68ec0x0 Board (IDP) - * stack grows up towards high memory. This works for - * both the rom68k and the mon68k monitors. - */ -MEMORY -@{ - ram : ORIGIN = 0x10000, LENGTH = 2M -@} -@end smallexample - -This specifies a name for a section that can be referred to later in the -script. In this case, it's only a pointer to the beginning of free RAM -space, with an upper limit at 2M. If the output file exceeds the upper -limit, it will produce an error message. - -@smallexample -/* - * stick everything in ram (of course) - */ -SECTIONS -@{ - .text : - @{ - CREATE_OBJECT_SYMBOLS - *(.text) - etext = .; - __CTOR_LIST__ = .; - LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2) - *(.ctors) - LONG(0) - __CTOR_END__ = .; - __DTOR_LIST__ = .; - LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2) - *(.dtors) - LONG(0) - __DTOR_END__ = .; - *(.lit) - *(.shdata) - @} > ram - .shbss SIZEOF(.text) + ADDR(.text) : @{ - *(.shbss) - @} -@end smallexample - -Set up the @code{.text} section. In a @code{COFF} file, .text is where -all the actual instructions are. This also sets up the @emph{CONTRUCTOR} -and the @emph{DESTRUCTOR} tables for @code{G++}. Notice that the section -description redirects itself to the @emph{ram} variable setup earlier. - -@smallexample - .talias : @{ @} > ram - .data : @{ - *(.data) - CONSTRUCTORS - _edata = .; - @} > ram -@end smallexample - -Setup the @code{.data} section. In a @code{coff} file, this is where all -he initialized data goes. @code{CONSTRUCTORS} is a special command used -by @code{ld}. - -@smallexample - .bss SIZEOF(.data) + ADDR(.data) : - @{ - __bss_start = ALIGN(0x8); - *(.bss) - *(COMMON) - end = ALIGN(0x8); - _end = ALIGN(0x8); - __end = ALIGN(0x8); - @} - .mstack : @{ @} > ram - .rstack : @{ @} > ram - .stab . (NOLOAD) : - @{ - [ .stab ] - @} - .stabstr . (NOLOAD) : - @{ - [ .stabstr ] - @} -@} -@end smallexample - -Setup the @code{.bss} section. In a @code{COFF} file, this is where -unitialized data goes. The symbols @code{_bss_start} and @code{_end} -are setup here for use by the @code{crt0.o} when it zero's the -@code{.bss} section. - - -@node What to do now, Libc, Linker Scripts, Libraries -@section What to do when you have a binary image - -A few ROM monitors load binary images, typically @code{a.out}, but most all -will load an @code{srecord}. An srecord is an ASCII representation of a binary -image. At it's simplest, an srecord is an address, followed by a byte -count, followed by the bytes, and a 2's compliment checksum. A whole -srecord file has an optional @emph{start} record, and a required @emph{end} -record. To make an srecord from a binary image, the GNU @code{objcopy} program -is used. This will read the image and make an srecord from it. To do -this, invoke objcopy like this: @code{objcopy -O srec infile outfile}. Most -PROM burners also read srecords or a similar format. Use @code{objdump -i} to -get a list of support object files types for your architecture. - -@node Libc, , What to do now, Libraries -@section Libraries - -This describes @code{newlib}, a freely available libc replacement. Most -applications use calls in the standard C library. When initially linking -in libc.a, several I/O functions are undefined. If you don't plan on -doing any I/O, then you're OK, otherwise they need to be created. These -routines are read, write, open, close. sbrk, and kill. Open & close -don't need to be fully supported unless you have a filesystems, so -typically they are stubbed out. Kill is also a stub, since you can't do -process control on an embedded system. - -Sbrk() is only needed by applications that do dynamic memory -allocation. It's uses the symbol @code{_end} that is setup in the linker -script. It also requires a compile time option to set the upper size -limit on the heap space. This leaves us with read and write, which are -required for serial I/O. Usually these two routines are written in C, -and call a lower level function for the actual I/O operation. These two -lowest level I/O primitives are inbyte() and outbyte(), and are also -used by GDB back ends if you've written an exception handler. Some -systems also implement a havebyte() for input as well. - -Other commonly included functions are routines for manipulating -LED's on the target (if they exist) or low level debug help. Typically a -putnum() for printing words and bytes as a hex number is helpful, as -well as a low-level print() to output simple strings. - -As libg++ uses the I/O routines in libc.a, if read and write work, -then libg++ will also work with no additional changes. - -@menu -* I/O Support:: Functions that make serial I/O work. -* Memory Support:: Memory support. -* Misc Support:: Other needed functions. -* Debugging:: Useful Debugging Functions -@end menu - -@node I/O Support, Memory Support, , Libc -@subsection Making I/O work - -@node Memory Support, Misc Support, I/O Support, Libc -@subsection Routines for dynamic memory allocation -To support using any of the memory functions, you need to implement -sbrk(). @code{malloc()}, @code{calloc()}, and @code{realloc()} all call -@code{sbrk()} at there lowest level. @code{caddr_t} is defined elsewhere -as @code{char *}. @code{RAMSIZE} is presently a compile time option. All -this does is move a pointer to heap memory and check for the upper -limit. @ref{glue.c,,Example libc support code}. @code{sbrk()} returns a -pointer to the previous value before more memory was allocated. - -@smallexample -/* _end is set in the linker command file * -extern caddr_t _end;/ - -/* just in case, most boards have at least some memory */ -#ifndef RAMSIZE -# define RAMSIZE (caddr_t)0x100000 -#endif - -/* - * sbrk -- changes heap size size. Get nbytes more - * RAM. We just increment a pointer in what's - * left of memory on the board. - */ -caddr_t -sbrk(nbytes) - int nbytes; -@{ - static caddr_t heap_ptr = NULL; - caddr_t base; - - if (heap_ptr == NULL) @{ - heap_ptr = (caddr_t)&_end; - @} - - if ((RAMSIZE - heap_ptr) >= 0) @{ - base = heap_ptr; - heap_ptr += nbytes; - return (base); - @} else @{ - errno = ENOMEM; - return ((caddr_t)-1); - @} -@} -@end smallexample - -@node Misc Support, Debugging, Memory Support, Libc -@subsection Misc support routines - -These are called by @code{newlib} but don't apply to the embedded -environment. @code{isatty()} is self explanatory. @code{kill()} doesn't -apply either in an environment withno process control, so it justs -exits, which is a similar enough behavior. @code{getpid()} can safely -return any value greater than 1. The value doesn't effect anything in -@code{newlib} because once again there is no process control. - -@smallexample -/* - * isatty -- returns 1 if connected to a terminal device, - * returns 0 if not. Since we're hooked up to a - * serial port, we'll say yes and return a 1. - */ -int -isatty(fd) - int fd; -@{ - return (1); -@} - -/* - * getpid -- only one process, so just return 1. - */ -#define __MYPID 1 -int -getpid() -@{ - return __MYPID; -@} - -/* - * kill -- go out via exit... - */ -int -kill(pid, sig) - int pid; - int sig; -@{ - if(pid == __MYPID) - _exit(sig); - return 0; -@} -@end smallexample - -@node Debugging, , Misc Support, Libc -@subsection Useful debugging functions - -There are always a few useful functions for debugging your project in -progress. I typically implement a simple @code{print()} routine that -runs standalone in liblgoss, with no @code{newlib} support. The I/O -function @code{outbyte()} can also be used for low level debugging. Many -times print will work when there are problems that cause @code{printf()} to -cause an exception. @code{putnum()} is just to print out values in hex -so they are easier to read. - -@smallexample -/* - * print -- do a raw print of a string - */ -int -print(ptr) -char *ptr; -@{ - while (*ptr) @{ - outbyte (*ptr++); - @} -@} - -/* - * putnum -- print a 32 bit number in hex - */ -int -putnum (num) -unsigned int num; -@{ - char buffer[9]; - int count; - char *bufptr = buffer; - int digit; - - for (count = 7 ; count >= 0 ; count--) @{ - digit = (num >> (count * 4)) & 0xf; - - if (digit <= 9) - *bufptr++ = (char) ('0' + digit); - else - *bufptr++ = (char) ('a' - 10 + digit); - @} - - *bufptr = (char) 0; - print (buffer); - return; -@} -@end smallexample - -If there are LEDs on the board, they can also be put to use for -debugging when the serial I/O code is being written. I usually implement -a @code{zylons()} function, which strobes the LEDS (if there is more -than one) in sequence, creating a rotating effect. This is convenient -between I/O to see if the target is still alive. Another useful LED -function is @code{led_putnum()}, which takes a digit and displays it as -a bit pattern or number. These usually have to be written in assembler -for each target board. Here are a number of C based routines that may be -useful. - -@code{led_putnum()} puts a number on a single digit segmented -LED display. This LED is set by setting a bit mask to an address, where -1 turns the segment off, and 0 turns it on. There is also a little -decimal point on the LED display, so it gets the leftmost bit. The other -bits specify the segment location. The bits look like: - -@smallexample - [d.p | g | f | e | d | c | b | a ] is the byte. -@end smallexample - -The locations are set up as: - -@smallexample - a - ----- - f | | b - | g | - ----- - | | - e | | c - ----- - d -@end smallexample - -This takes a number that's already been converted to a string, and -prints it. - -@smallexample -#define LED_ADDR 0xd00003 - -void -led_putnum ( num ) -char num; -@{ - static unsigned char *leds = (unsigned char *)LED_ADDR; - static unsigned char num_bits [18] = @{ - 0xff, /* clear all */ - 0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x98, /* numbers 0-9 */ - 0x98, 0x20, 0x3, 0x27, 0x21, 0x4, 0xe /* letters a-f */ - @}; - - if (num >= '0' && num <= '9') - num = (num - '0') + 1; - - if (num >= 'a' && num <= 'f') - num = (num - 'a') + 12; - - if (num == ' ') - num = 0; - - *leds = num_bits[num]; -@} - -/* - * zylons -- draw a rotating pattern. NOTE: this function never returns. - */ -void -zylons() -@{ - unsigned char *leds = (unsigned char *)LED_ADDR; - unsigned char curled = 0xfe; - - while (1) - @{ - *leds = curled; - curled = (curled >> 1) | (curled << 7); - delay ( 200 ); - @} -@} -@end smallexample - - -@node GDB, Binutils, Libraries, Top -@chapter Writing a new GDB backend - -Typically, either the low-level I/O routines are used for debugging, or -LEDs, if present. It is much easier to use GDb for debugging an -application. There are several different techniques used to have GDB work -remotely. Commonly more than one kind of GDB interface is used to cober -a wide variety of development needs. - -The most common style of GDB backend is an exception handler for -breakpoints. This is also called a @emph{gdb stub}, and is requires the -two additional lines of init code in your @code{main()} routine. The GDB -stubs all use the GDB @emph{remote protocol}. When the application gets a -breakpoint exception, it communicates to GDB on the host. - -Another common style of interfacing GDB to a target is by using an -existing ROM monitor. These break down into two main kinds, a similar -protocol to the GDB remote protocol, and an interface that uses the ROM -monitor directly. This kind has GDB simulating a human operator, and all -GDB does is work as a command formatter and parser. - -@menu -* GNU remote protocol:: The standard remote protocol. -* Exception handler:: A linked in exception handler. -* ROM monitors:: Using a ROM monitor as a backend. -* Other remote protocols:: Adding support for new protocols. -@end menu - -@node GNU remote protocol, Exception handler, ,GDB -@section The standard remote protocol - -The standard remote protocol is a simple, packet based scheme. A debug -packet whose contents are @emph{<data>} is encapsulated for transmission -in the form: - -@smallexample - $ <data> # CSUM1 CSUM2 -@end smallexample - -@emph{<data>} must be ASCII alphanumeric and cannot include characters -@code{$} or @code{#}. If @emph{<data>} starts with two characters -followed by @code{:}, then the existing stubs interpret this as a -sequence number. For example, the command @code{g} is used to read the -values of the registers. So, a packet to do this would look like - -@smallexample - $g#67 -@end smallexample - -@emph{CSUM1} and @emph{CSUM2} are an ascii representation in hex of an -8-bit checksum of @emph{<data>}, the most significant nibble is sent first. -the hex digits 0-9,a-f are used. - -A simple protocol is used when communicating with the target. This is -mainly to give a degree of error handling over the serial cable. For -each packet transmitted successfully, the target responds with a -@code{+} (@code{ACK}). If there was a transmission error, then the target -responds with a @code{-} (@code{NAK}). An error is determined when the -checksum doesn't match the calculated checksum for that data record. -Upon reciept of the @code{ACK}, @code{GDB} can then transmit the next -packet. - -Here is a list of the main functions that need to be supported. Each data -packet is a command with a set number of bytes in the command packet. -Most commands either return data, or respond with a @code{NAK}. Commands -that don't return data respond with an @code{ACK}. All data values are -ascii hex digits. Every byte needs two hex digits to represent t. This -means that a byte with the value @samp{7} becomes @samp{07}. On a 32 bit -machine this works out to 8 characters per word. All of the bytes in a -word are stored in the target byte order. When writing the host side of -the GDB protocol, be careful of byte order, and make sure that the code -will run on both big and little endian hosts and produce the same answers. - -These functions are the minimum required to make a GDB backend work. All -other commands are optional, and not supported by all GDB backends. - -@table @samp -@item read registers @code{g} - -returns @code{XXXXXXXX...} - -Registers are in the internal order for GDB, and the bytes in a register -are in the same order the machine uses. All values are in sequence -starting with register 0. All registers are listed in the same packet. A -sample packet would look like @code{$g#}. - -@item write registers @code{GXXXXXXXX...} -@code{XXXXXXXX} is the value to set the register to. Registers are in -the internal order for GDB, and the bytes in a register are in the same -order the machine uses. All values are in sequence starting with -register 0. All registers values are listed in the same packet. A sample -packet would look like @code{$G000000001111111122222222...#} - -returns @code{ACK} or @code{NAK} - -@item read memory @code{mAAAAAAAA,LLLL} -@code{AAAAAAAA} is address, @code{LLLL} is length. A sample packet would -look like @code{$m00005556,0024#}. This would request 24 bytes starting -at address @emph{00005556} - -returns @code{XXXXXXXX...} -@code{XXXXXXXX} is the memory contents. Fewer bytes than requested will -be returned if only part of the data can be read. This can be determined -by counting the values till the end of packet @code{#} is seen and -comparing that with the total count of bytes that was requested. - -@item write memory @code{MAAAAAAAA,LLLL:XXXXXXXX} -@code{AAAAAAAA} is the starting address, @code{LLLL} is the number of -bytes to be written, and @code{XXXXXXXX} is value to be written. A -sample packet would look like -@code{$M00005556,0024:101010101111111100000000...#} - -returns @code{ACK} or @code{NAK} for an error. @code{NAK} is also -returned when only part of the data is written. - -@item continue @code{cAAAAAAAAA} -@code{AAAAAAAA} is address to resume execution at. If @code{AAAAAAAA} is -omitted, resume at the curent address of the @code{pc} register. - -returns the same replay as @code{last signal}. There is no immediate -replay to @code{cont} until the next breakpoint is reached, and the -program stops executing. - -@item step sAA..AA -@code{AA..AA} is address to resume -If @code{AA..AA} is omitted, resume at same address. - -returns the same replay as @code{last signal}. There is no immediate -replay to @code{step} until the next breakpoint is reached, and the -program stops executing. - -@item last signal @code{?} - -This returns one of the following: - -@itemize @bullet -@item @code{SAA} -Where @code{AA} is the number of the last signal. -Exceptions on the target are converted to the most similar Unix style -signal number, like @code{SIGSEGV}. A sample response of this type would -look like @code{$S05#}. - -@item TAAnn:XXXXXXXX;nn:XXXXXXXX;nn:XXXXXXXX; -@code{AA} is the signal number. -@code{nn} is the register number. -@code{XXXXXXXX} is the register value. - -@item WAA -The process exited, and @code{AA} is the exit status. This is only -applicable for certains sorts of targets. - -@end itemize - -These are used in some GDB backends, but not all. - -@item write reg @code{Pnn=XXXXXXXX} -Write register @code{nn} with value @code{XXXXXXXX}. - -returns @code{ACK} or @code{NAK} - -@item kill request k - -@item toggle debug d -toggle debug flag (see 386 & 68k stubs) - -@item reset r -reset -- see sparc stub. - -@item reserved @code{other} -On other requests, the stub should ignore the request and send an empty -response @code{$#<checksum>}. This way we can extend the protocol and GDB -can tell whether the stub it is talking to uses the old or the new. - -@item search @code{tAA:PP,MM} -Search backwards starting at address @code{AA} for a match with pattern -PP and mask @code{MM}. @code{PP} and @code{MM} are 4 bytes. - -@item general query @code{qXXXX} -Request info about XXXX. - -@item general set @code{QXXXX=yyyy} -Set value of @code{XXXX} to @code{yyyy}. - -@item query sect offs @code{qOffsets} -Get section offsets. Reply is @code{Text=xxx;Data=yyy;Bss=zzz} - -@item console output Otext -Send text to stdout. The text gets display from the target side of the -serial connection. - -@end table - -Responses can be run-length encoded to save space. A @code{*}means that -the next character is an ASCII encoding giving a repeat count which -stands for that many repetitions of the character preceding the @code{*}. -The encoding is n+29, yielding a printable character where n >=3 -(which is where run length encoding starts to win). You can't use a -value of where n >126 because it's only a two byte value. An example -would be a @code{0*03} means the same thing as @code{0000}. - -@node Exception handler, ROM monitors, GNU remote protocol, GDB -@section A linked in exception handler - -A @emph{GDB stub} consists of two parts, support for the exception -handler, and the exception handler itself. The exception handler needs -to communicate to GDB on the host whenever there is a breakpoint -exception. When GDB starts a program running on the target, it's polling -the serial port during execution looking for any debug packets. So when -a breakpoint occurs, the exception handler needs to save state, and send -a GDB remote protocol packet to GDB on the host. GDB takes any output -that isn't a debug command packet and displays it in the command window. - -Support for the exception handler varies between processors, but the -minimum supported functions are those needed by GDB. These are functions -to support the reading and writing of registers, the reading and writing -of memory, start execution at an address, single step, and last signal. -Sometimes other functions for adjusting the baud rate, or resetting the -hardware are implemented. - -Once GDB gets the command packet from the breakpoint, it will read a few -registers and memory locations an then wait for the user. When the user -types @code{run} or @code{continue} a @code{continue} command is issued -to the backend, and control returns from the breakpoint routine to the -application. - -@node ROM monitors, Other remote protocols, Exception handler, GDB -@section Using a ROM monitor as a backend -GDB also can mimic a human user and use a ROM monitors normal debug -commands as a backend. This consists mostly of sending and parsing -@code{ASCII} strings. All the ROM monitor interfaces share a common set -of routines in @code{gdb/monitor.c}. This supports adding new ROM -monitor interfaces by filling in a structure with the common commands -GDB needs. GDb already supports several command ROM monitors, including -Motorola's @code{Bug} monitor for their VME boards, and the Rom68k -monitor by Integrated Systems, Inc. for various m68k based boards. GDB -also supports the custom ROM monitors on the WinBond and Oki PA based -targets. There is builtin support for loading files to ROM monitors -specifically. GDB can convert a binary into an srecord and then load it -as an ascii file, or using @code{xmodem}. - -@c FIXME: do I need trademark somethings here ? Is Integrated the right -@c company? - -@node Other remote protocols, ,ROM monitors, GDB -@section Adding support for new protocols -@c FIXME: write something here - -@node Binutils, Code Listings, GDB, Top - -@node Code Listings, idp.ld, Binutils, Top -@appendix Code Listings - -@menu -* idp.ld:: A m68k linker script. -* crt0.S:: Crt0.S for an m68k. -* glue.c:: C based support for for Stdio functions. -* mvme.S:: Rom monitor based I/O support in assembler. -* io.c:: C based for memory mapped I/O. -* leds.c:: C based LED routines. -@end menu - -@node idp.ld, crt0.S, Code Listings, Code Listings -@section Linker script for the IDP board - -This is the linker script script that is used on the Motorola IDP board. - -@example -STARTUP(crt0.o) -OUTPUT_ARCH(m68k) -INPUT(idp.o) -SEARCH_DIR(.) -__DYNAMIC = 0; -/* - * Setup the memory map of the MC68ec0x0 Board (IDP) - * stack grows up towards high memory. This works for - * both the rom68k and the mon68k monitors. - */ -MEMORY -@{ - ram : ORIGIN = 0x10000, LENGTH = 2M -@} -/* - * stick everything in ram (of course) - */ -SECTIONS -@{ - .text : - @{ - CREATE_OBJECT_SYMBOLS - *(.text) - etext = .; - __CTOR_LIST__ = .; - LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2) - *(.ctors) - LONG(0) - __CTOR_END__ = .; - __DTOR_LIST__ = .; - LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2) - *(.dtors) - LONG(0) - __DTOR_END__ = .; - *(.lit) - *(.shdata) - @} > ram - .shbss SIZEOF(.text) + ADDR(.text) : @{ - *(.shbss) - @} - .talias : @{ @} > ram - .data : @{ - *(.data) - CONSTRUCTORS - _edata = .; - @} > ram - - .bss SIZEOF(.data) + ADDR(.data) : - @{ - __bss_start = ALIGN(0x8); - *(.bss) - *(COMMON) - end = ALIGN(0x8); - _end = ALIGN(0x8); - __end = ALIGN(0x8); - @} - .mstack : @{ @} > ram - .rstack : @{ @} > ram - .stab . (NOLOAD) : - @{ - [ .stab ] - @} - .stabstr . (NOLOAD) : - @{ - [ .stabstr ] - @} -@} -@end example - -@node crt0.S, glue.c, idp.ld, Code Listings -@section crt0.S - The startup file - -@example -/* - * crt0.S -- startup file for m68k-coff - * - */ - - .title "crt0.S for m68k-coff" - -/* These are predefined by new versions of GNU cpp. */ - -#ifndef __USER_LABEL_PREFIX__ -#define __USER_LABEL_PREFIX__ _ -#endif - -#ifndef __REGISTER_PREFIX__ -#define __REGISTER_PREFIX__ -#endif - -/* ANSI concatenation macros. */ - -#define CONCAT1(a, b) CONCAT2(a, b) -#define CONCAT2(a, b) a ## b - -/* Use the right prefix for global labels. */ - -#define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x) - -/* Use the right prefix for registers. */ - -#define REG(x) CONCAT1 (__REGISTER_PREFIX__, x) - -#define d0 REG (d0) -#define d1 REG (d1) -#define d2 REG (d2) -#define d3 REG (d3) -#define d4 REG (d4) -#define d5 REG (d5) -#define d6 REG (d6) -#define d7 REG (d7) -#define a0 REG (a0) -#define a1 REG (a1) -#define a2 REG (a2) -#define a3 REG (a3) -#define a4 REG (a4) -#define a5 REG (a5) -#define a6 REG (a6) -#define fp REG (fp) -#define sp REG (sp) - -/* - * Set up some room for a stack. We just grab a chunk of memory. - */ - .set stack_size, 0x2000 - .comm SYM (stack), stack_size - -/* - * Define an empty environment. - */ - .data - .align 2 -SYM (environ): - .long 0 - - .align 2 - .text - .global SYM (stack) - - .global SYM (main) - .global SYM (exit) -/* - * This really should be __bss_start, not SYM (__bss_start). - */ - .global __bss_start - -/* - * start -- set things up so the application will run. - */ -SYM (start): - link a6, #-8 - moveal #SYM (stack) + stack_size, sp - -/* - * zerobss -- zero out the bss section - */ - moveal #__bss_start, a0 - moveal #SYM (end), a1 -1: - movel #0, (a0) - leal 4(a0), a0 - cmpal a0, a1 - bne 1b - -/* - * Call the main routine from the application to get it going. - * main (argc, argv, environ) - * We pass argv as a pointer to NULL. - */ - pea 0 - pea SYM (environ) - pea sp@@(4) - pea 0 - jsr SYM (main) - movel d0, sp@@- - -/* - * _exit -- Exit from the application. Normally we cause a user trap - * to return to the ROM monitor for another run. - */ -SYM (exit): - trap #0 -@end example - -@node glue.c, mvme.S, crt0.S, Code Listings -@section C based "glue" code. - -@example - -/* - * glue.c -- all the code to make GCC and the libraries run on - * a bare target board. These should work with any - * target if inbyte() and outbyte() exist. - */ - -#include <sys/types.h> -#include <sys/stat.h> -#include <errno.h> -#ifndef NULL -#define NULL 0 -#endif - -/* FIXME: this is a hack till libc builds */ -__main() -@{ - return; -@} - -#undef errno -int errno; - -extern caddr_t _end; /* _end is set in the linker command file */ -extern int outbyte(); -extern unsigned char inbyte(); -extern int havebyte(); - -/* just in case, most boards have at least some memory */ -#ifndef RAMSIZE -# define RAMSIZE (caddr_t)0x100000 -#endif - -/* - * read -- read bytes from the serial port. Ignore fd, since - * we only have stdin. - */ -int -read(fd, buf, nbytes) - int fd; - char *buf; - int nbytes; -@{ - int i = 0; - - for (i = 0; i < nbytes; i++) @{ - *(buf + i) = inbyte(); - if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) @{ - (*(buf + i)) = 0; - break; - @} - @} - return (i); -@} - -/* - * write -- write bytes to the serial port. Ignore fd, since - * stdout and stderr are the same. Since we have no filesystem, - * open will only return an error. - */ -int -write(fd, buf, nbytes) - int fd; - char *buf; - int nbytes; -@{ - int i; - - for (i = 0; i < nbytes; i++) @{ - if (*(buf + i) == '\n') @{ - outbyte ('\r'); - @} - outbyte (*(buf + i)); - @} - return (nbytes); -@} - -/* - * open -- open a file descriptor. We don't have a filesystem, so - * we return an error. - */ -int -open(buf, flags, mode) - char *buf; - int flags; - int mode; -@{ - errno = EIO; - return (-1); -@} - -/* - * close -- close a file descriptor. We don't need - * to do anything, but pretend we did. - */ -int -close(fd) - int fd; -@{ - return (0); -@} - -/* - * sbrk -- changes heap size size. Get nbytes more - * RAM. We just increment a pointer in what's - * left of memory on the board. - */ -caddr_t -sbrk(nbytes) - int nbytes; -@{ - static caddr_t heap_ptr = NULL; - caddr_t base; - - if (heap_ptr == NULL) @{ - heap_ptr = (caddr_t)&_end; - @} - - if ((RAMSIZE - heap_ptr) >= 0) @{ - base = heap_ptr; - heap_ptr += nbytes; - return (base); - @} else @{ - errno = ENOMEM; - return ((caddr_t)-1); - @} -@} - -/* - * isatty -- returns 1 if connected to a terminal device, - * returns 0 if not. Since we're hooked up to a - * serial port, we'll say yes and return a 1. - */ -int -isatty(fd) - int fd; -@{ - return (1); -@} - -/* - * lseek -- move read/write pointer. Since a serial port - * is non-seekable, we return an error. - */ -off_t -lseek(fd, offset, whence) - int fd; - off_t offset; - int whence; -@{ - errno = ESPIPE; - return ((off_t)-1); -@} - -/* - * fstat -- get status of a file. Since we have no file - * system, we just return an error. - */ -int -fstat(fd, buf) - int fd; - struct stat *buf; -@{ - errno = EIO; - return (-1); -@} - -/* - * getpid -- only one process, so just return 1. - */ -#define __MYPID 1 -int -getpid() -@{ - return __MYPID; -@} - -/* - * kill -- go out via exit... - */ -int -kill(pid, sig) - int pid; - int sig; -@{ - if(pid == __MYPID) - _exit(sig); - return 0; -@} - -/* - * print -- do a raw print of a string - */ -int -print(ptr) -char *ptr; -@{ - while (*ptr) @{ - outbyte (*ptr++); - @} -@} - -/* - * putnum -- print a 32 bit number in hex - */ -int -putnum (num) -unsigned int num; -@{ - char buffer[9]; - int count; - char *bufptr = buffer; - int digit; - - for (count = 7 ; count >= 0 ; count--) @{ - digit = (num >> (count * 4)) & 0xf; - - if (digit <= 9) - *bufptr++ = (char) ('0' + digit); - else - *bufptr++ = (char) ('a' - 10 + digit); - @} - - *bufptr = (char) 0; - print (buffer); - return; -@} -@end example - -@node mvme.S, io.c, glue.c, Code Listings -@section I/O assembler code sample - -@example -/* - * mvme.S -- board support for m68k - */ - - .title "mvme.S for m68k-coff" - -/* These are predefined by new versions of GNU cpp. */ - -#ifndef __USER_LABEL_PREFIX__ -#define __USER_LABEL_PREFIX__ _ -#endif - -#ifndef __REGISTER_PREFIX__ -#define __REGISTER_PREFIX__ -#endif - -/* ANSI concatenation macros. */ - -#define CONCAT1(a, b) CONCAT2(a, b) -#define CONCAT2(a, b) a ## b - -/* Use the right prefix for global labels. */ - -#define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x) - -/* Use the right prefix for registers. */ - -#define REG(x) CONCAT1 (__REGISTER_PREFIX__, x) - -#define d0 REG (d0) -#define d1 REG (d1) -#define d2 REG (d2) -#define d3 REG (d3) -#define d4 REG (d4) -#define d5 REG (d5) -#define d6 REG (d6) -#define d7 REG (d7) -#define a0 REG (a0) -#define a1 REG (a1) -#define a2 REG (a2) -#define a3 REG (a3) -#define a4 REG (a4) -#define a5 REG (a5) -#define a6 REG (a6) -#define fp REG (fp) -#define sp REG (sp) -#define vbr REG (vbr) - - .align 2 - .text - .global SYM (_exit) - .global SYM (outln) - .global SYM (outbyte) - .global SYM (putDebugChar) - .global SYM (inbyte) - .global SYM (getDebugChar) - .global SYM (havebyte) - .global SYM (exceptionHandler) - - .set vbr_size, 0x400 - .comm SYM (vbr_table), vbr_size - -/* - * inbyte -- get a byte from the serial port - * d0 - contains the byte read in - */ - .align 2 -SYM (getDebugChar): /* symbol name used by m68k-stub */ -SYM (inbyte): - link a6, #-8 - trap #15 - .word inchr - moveb sp@@, d0 - extbl d0 - unlk a6 - rts - -/* - * outbyte -- sends a byte out the serial port - * d0 - contains the byte to be sent - */ - .align 2 -SYM (putDebugChar): /* symbol name used by m68k-stub */ -SYM (outbyte): - link fp, #-4 - moveb fp@@(11), sp@@ - trap #15 - .word outchr - unlk fp - rts - -/* - * outln -- sends a string of bytes out the serial port with a CR/LF - * a0 - contains the address of the string's first byte - * a1 - contains the address of the string's last byte - */ - .align 2 -SYM (outln): - link a6, #-8 - moveml a0/a1, sp@@ - trap #15 - .word outln - unlk a6 - rts - -/* - * outstr -- sends a string of bytes out the serial port without a CR/LF - * a0 - contains the address of the string's first byte - * a1 - contains the address of the string's last byte - */ - .align 2 -SYM (outstr): - link a6, #-8 - moveml a0/a1, sp@@ - trap #15 - .word outstr - unlk a6 - rts - -/* - * havebyte -- checks to see if there is a byte in the serial port, - * returns 1 if there is a byte, 0 otherwise. - */ -SYM (havebyte): - trap #15 - .word instat - beqs empty - movel #1, d0 - rts -empty: - movel #0, d0 - rts - -/* - * These constants are for the MVME-135 board's boot monitor. They - * are used with a TRAP #15 call to access the monitor's I/O routines. - * they must be in the word following the trap call. - */ - .set inchr, 0x0 - .set instat, 0x1 - .set inln, 0x2 - .set readstr, 0x3 - .set readln, 0x4 - .set chkbrk, 0x5 - - .set outchr, 0x20 - .set outstr, 0x21 - .set outln, 0x22 - .set write, 0x23 - .set writeln, 0x24 - .set writdln, 0x25 - .set pcrlf, 0x26 - .set eraseln, 0x27 - .set writd, 0x28 - .set sndbrk, 0x29 - - .set tm_ini, 0x40 - .set dt_ini, 0x42 - .set tm_disp, 0x43 - .set tm_rd, 0x44 - - .set redir, 0x60 - .set redir_i, 0x61 - .set redir_o, 0x62 - .set return, 0x63 - .set bindec, 0x64 - - .set changev, 0x67 - .set strcmp, 0x68 - .set mulu32, 0x69 - .set divu32, 0x6A - .set chk_sum, 0x6B - -@end example - -@node io.c, leds.c, mvme.S, Code Listings -@section I/O code sample - -@example -#include "w89k.h" - -/* - * outbyte -- shove a byte out the serial port. We wait till the byte - */ -int -outbyte(byte) - unsigned char byte; -@{ - while ((inp(RS232REG) & TRANSMIT) == 0x0) @{ @} ; - return (outp(RS232PORT, byte)); -@} - -/* - * inbyte -- get a byte from the serial port - */ -unsigned char -inbyte() -@{ - while ((inp(RS232REG) & RECEIVE) == 0x0) @{ @}; - return (inp(RS232PORT)); -@} -@end example - -@node leds.c, ,io.c, Code Listings -@section Led control sample - -@example -/* - * leds.h -- control the led's on a Motorola mc68ec0x0 board. - */ - -#ifndef __LEDS_H__ -#define __LEDS_H__ - -#define LED_ADDR 0xd00003 -#define LED_0 ~0x1 -#define LED_1 ~0x2 -#define LED_2 ~0x4 -#define LED_3 ~0x8 -#define LED_4 ~0x10 -#define LED_5 ~0x20 -#define LED_6 ~0x40 -#define LED_7 ~0x80 -#define LEDS_OFF 0xff -#define LEDS_ON 0x0 - -#define FUDGE(x) ((x >= 0xa && x <= 0xf) ? (x + 'a') & 0x7f : (x + '0') & 0x7f) - -extern void led_putnum( char ); - -#endif /* __LEDS_H__ */ - -/* - * leds.c -- control the led's on a Motorola mc68ec0x0 (IDP)board. - */ -#include "leds.h" - -void zylons(); -void led_putnum(); - -/* - * led_putnum -- print a hex number on the LED. the value of num must be a char with - * the ascii value. ie... number 0 is '0', a is 'a', ' ' (null) clears - * the led display. - * Setting the bit to 0 turns it on, 1 turns it off. - * the LED's are controlled by setting the right bit mask in the base - * address. - * The bits are: - * [d.p | g | f | e | d | c | b | a ] is the byte. - * - * The locations are: - * - * a - * ----- - * f | | b - * | g | - * ----- - * | | - * e | | c - * ----- - * d . d.p (decimal point) - */ -void -led_putnum ( num ) -char num; -@{ - static unsigned char *leds = (unsigned char *)LED_ADDR; - static unsigned char num_bits [18] = @{ - 0xff, /* clear all */ - 0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x98, /* numbers 0-9 */ - 0x98, 0x20, 0x3, 0x27, 0x21, 0x4, 0xe /* letters a-f */ - @}; - - if (num >= '0' && num <= '9') - num = (num - '0') + 1; - - if (num >= 'a' && num <= 'f') - num = (num - 'a') + 12; - - if (num == ' ') - num = 0; - - *leds = num_bits[num]; -@} - -/* - * zylons -- draw a rotating pattern. NOTE: this function never returns. - */ -void -zylons() -@{ - unsigned char *leds = (unsigned char *)LED_ADDR; - unsigned char curled = 0xfe; - - while (1) - @{ - *leds = curled; - curled = (curled >> 1) | (curled << 7); - delay ( 200 ); - @} -@} -@end example - -@page -@contents -@c second page break makes sure right-left page alignment works right -@c with a one-page toc, even though we don't have setchapternewpage odd. -@page -@bye |