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EnigmA Amiga Run 1996 June
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EnigmA AMIGA RUN 08 (1996)(G.R. Edizioni)(IT)[!][issue 1996-06][EARSAN CD VII].iso
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gcc
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ixemlsrc.lha
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ixemul
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NEWS
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1996-03-26
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============
VERSION 43.0
============
Integrated Jeff Shepherd's networking code. If ixnet.library is installed,
then ixemul.library will use the networking functions from the
ixnet.library, instead of the default dummy implementation. Ixnet.library
works with AS225 and with AmiTCP. It supports both clients and daemons.
A program that uses networking functions is completely shielded from the
AS225 and AmiTCP differences by ixnet.library. That library will take care
of all the details for you. That means that there is no longer any need to
provide two different binaries, one for AS225 and one for AmiTCP.
Furthermore, it is relatively easy to add support for other network
packages. Thanks, Jeff!
Added stackchecking and extension code, thanks to Matthias Fleischer.
Finalized GDB support.
============
VERSION 42.1
============
Fixed bugs when running non-ixemul programs from tools like pdksh or make.
You could get Enforcer hits and the Ctrl-C support also crashed the Amiga.
Use the NetBSD code for the system() function instead of using the Amiga
kernel function SystemTagList. This was the cause of several
incompatibilities when porting Unix programs.
Improved termios support (added OPORT and ONLCR flags and the INLCR flag).
Fixed ptrace handling. Almost none of Leonard's code has survived, I used a
completely different method.
Fixed a problem where the name of the current directory, as is visible
by the shell, wasn't changed when a program terminated and ixemul reset the
current directory to its original place.
Improved performance somewhat by no longer going through address 4 to get
to the ExecBase structure. Instead, it's copied once to the SysBase
variable, and thereafter only that variable is used. The Enforcer manual
warned against accessing address 4 too often, and ixemul.library did that
a lot.
Also improved performance by fixing a busy wait. At one point in the
ixemul, the program cannot continue until a context switch has taken place.
So ixemul waits until the dispatch count of ExecBase has changed,
indicating that a context switch has taken place. By installing a small,
high priority (9) task with body "for (;;) Wait(1 << 31);" and signalling
that task whenever a context switch is needed, I was able to circumvent the
busy wait loop. Because of the high priority of the Task, a context switch
would take place immediately. The task itself goes back to sleep at once,
so there is no time lost there.
============
VERSION 42.0
============
Installed patch in arith.c to work around bug in IEEEDPCmp. If the first
32 bits of both doubles are equal, and both doubles are negative, then
the result can no longer be trusted. Discovered by Bart Van Assche.
Ixtrace has been updated to recognize all 42.0 syscalls, thanks to David
Zaroski.
Ctrl-C handling worked with KingCON, but not with the standard AmigaDOS
CON-handler (since I use KingCON I never noticed this until it was pointed
out to me by Fred Fish :-). This has now been fixed. See the comments in
library/__read.c for more information.
Added the uname() function, written by Lars Hecking.
The termios code now properly recognizes the ICRNL input flag for '\r' to
'\n' translation.
Fixed a bug in the fcntl() function (actually, in the fcntl.h and
sys/fcntl.h headers).
Moved several static variables to user.h, so they are now process-specific.
Added profiling support. It was always there, but it was never actually
used.
The write() function writes its buffer line-by-line instead of in one big
chunk if the filehandle is the handle of an interactive stream (for
example, a console window). This allows the user to interrupt the output by
pressing a key and it also allows the use of Ctrl-C to break the program.
In previous versions you were unable to stop the output if you forgot to
redirect it to a file. E.g., 'cat /libs/ixemul.library' would essentially
take over the computer.
Changed default stack size handling when a new process is launched. It is
either the value of the environment variable IXSTACK, or it inherits the
size from its parent, but if that size is less than 16384, it uses a stack
of 16384 bytes instead.
Replaced ixconfig by ixprefs (written by Kriton Kyrimis).
Integrated the partial ptrace support from Leonard Norrgard.
Removed the gnulib, gnulib-68881 and gnulib-soft-float directories.
Compiled with -Wall and fixed (nearly) all warnings. Some warnings are
inevitable and cannot be avoided. -Wall already caught one illegal memory
access bug in __Close()!
Added functions to set and get ixemulbase-private information. This will
break older ixconfig's but is much cleaner. Nearly all of the ixemulbase
structure is now off-limits and liable to change without notice! You are
warned! In fact, the structure has been changed already. The library will
complain if a program called 'ixconfig' tries to use it to prevent the user
from using an old ixconfig with the new library.
Removed several arithmetic functions dealing with 'long long' types. They
didn't belong in the library, link with libgcc.a instead. Also removed some
arithmetic functions that are never called because they are compiled
directly in 68000 assembly. Don't know why they were ever added.
Fixed gen_glue.c so that it no longer generates glue for obsolete functions.
Removed ssystem(). ssystem() was the precursor of vfork/execve, and is no
longer needed. NOTE: it is still used in gcc. But this fails spectacularly
once you use Ctrl-C! Delete gcc and replace it by gccv, this one uses
vfork/execve as it should and works perfectly.
ixemul.library now uses the new-style inlines.
qsort() is now re-entrant and no longer uses the horrible Semaphore hack.
Moved general/fts.c to the static library. These directory-tree traversal
functions are rarely, if ever used, so they belong in libc.a and not in a
shared library.
Reorganized the Makefiles. The makefiles now use several GNU make-only
features to make them smaller and easier to maintain. 'make clean' and
'make clobber' now work correctly. It is also no longer nessecary to add
the -srcdir option to 'sh configure' in order to create valid Makefiles.
The top level Makefile contains the line 'export CATENATE = 1'. If this
line is present, the compilation speed is greatly improved by catenating
several small C-sources together into one bigger C-source, and then the
bigger one is compiled. By commenting this line each separate source is
compiled. Note that besides improving compilation speed, the library also
gets smaller as the compiler can now determine whether a call can be made
relative or should remain absolute.
Fixed a symlink-bug (ln -s /ram/t created a symlink to /am/t, removing the
first character of the volumename).
Moved ixtrace to the new utils directory, together with the small ixrun
utility. ixrun can be used to run Amiga batch files from /bin/sh (just put
';!ixrun' at the second line (!) of the batch file). Also added manual
page for ixrun.
Cleaned up the static directory: removed xmalloc.c and alloca.c as they do
not belong in the standard C library. Also replaced the ctime.c source by
the version from elsie.nci.nih.gov, which is the official version used by
NetBSD and Linux, among others. Finally, errlst.c and siglist.c now just
include their counterparts in the general directory.
The version information is placed in the version.in file in the
top-level directory. The version.c and version.h sources are created from
this file.
The print_base_size.c and print_user.c sources have been replaced by
create_header.c, which creates a header containing a few defines that are
used by start.s and trap.s. These used to be hard-coded, but now they are
generated, preventing future mistakes.
Added the raise function. For some reason, raise.c was never compiled into
the library. It is now.
Removed ALL sources that were not needed for compilation.
Added timezone handling. The timezone databases from elsie.nci.nih.gov are
used and installed in etc:zoneinfo. The new ixtimezone utility should be
added to the startup-sequence. This utility determines the correct offset
for Greenwich Mean Time. Read the manual page (Yes! Documentation at last!)
for more information.
Merged the ixpipe-handler into the ixemul-distribution. It has been placed
in the utils-directory.
Added hack to allow ixemul to run AmigaDOS scripts without breaking them
when run from the AmigaDOS shell. The problem is that the ".KEY" string
must be at the first line of the script, while ixemul also looks for "#!"
and ";!" in the first line. If a file starts with ".KEY", ixemul will now
skip the first line, before checking for "#!" and ";!".
============
VERSION 41.4
============
Integrated patches from Hans Verkuil that fix CTRL-C handling, fix another
signal bug, fix problem with "rm -f", prepare for proper timezone handling,
and remove '@' hack in argument parsing.
Applied patch from Kamil Iskra to avoid incompatibility between ixemul
and the popular KingCON 1.3. This is KingCON's fault because it makes
invalid assumptions about the nature of reply port contained in "dp_Port"
of packets sent to it. Also applied patch (duplicated in Hans' patches)
to crt0.c that fixes bug where the revision requester was not working
properly if the current revision is 0.
Applied patch from Rask Lambertsen (duplicated in Hans' patches) that makes
ixemul.library open "CONSOLE:" instead of "*".
Added implementation from Kriton Kyrimis for srand48, seed48, lcong48,
lrand48, nrand48, mrand48, jrand48, drand48, and erand48.
Added "#include <sys/types.h>" to <dirent.h> to be more compatible
with most current systems that do this inclusion for you. This change
should be backwards compatible with code that does the inclusion
explicitly. Suggested by Lars Hecking.
Changed prototype in <unistd.h> for getpgrp() to take a pid_t argument,
which matches the implementation in library/getcrap.c. Suggested by
Lars Hecking.
Made change to <math-68881.h> in pow() so that if x<0 the code does
log(-x) rather than log(x). Suggested by Thomas Radtke and implemented
by Lars Hecking.
Disable definitions of F_GETLK, F_SETLK, F_SETLKW, F_RDLCK, F_UNLCK, and
F_WRLCK in <fcntl.h> since they are unimplemented and thus might have misled
autoconfiguration schemes into thinking they were available. Also fix
ixtrace.c so it will still compile without these defined. Suggested by
Robert Ramiega.
Integrated patch from Joop van de Wege (duplicated in Hans' patches) for
setting up fpu on 68060.
============
VERSION 41.3
============
Updated DBL_MIN and DBL_MAX in float.h to include one additional digit
of precision. Enclose negative constants in parens to avoid unexpected
conversion to subtraction via cpp macros.
Applied patch from Hans Verkuil to fix serious bug in signal handling,
to reset all signal handlers after an execve, except for those which are
being ignored (SIG_IGN).
Applied patch from Joop van de Wege to trap.s to set 68881 rounding mode
back to truncation instead of "round to nearest", as required by the
ANSI C standard which specifies truncation.
Integrated ixtrace into source tree and arranged for it to be built and
installed.
============
VERSION 41.2
============
Added "#include <sys/types.h>" to <sys/stat.h> to be more compatible
with most current systems that do this inclusion for you. This change
should be backwards compatible with code that does the inclusion
explicitly.
Changed version string to be style guide compliant. Also arranged that
version.o gets linked in, since it has the $VER: string and is otherwise
unreferenced by any ixemul.library code.
Merged patches from Hans Verkuil to fix execve environment passing,
always open the console for stderr if no other file handle is provided,
move AmigaDOS style filename matching into glob(), and fix a small problem
with "open(NULL,...) that caused enforcer hits.
============
VERSION 41.1
============
A 68040 version of the library with soft floating point is now built,
since there are apparently systems that use the versions of the 68040
without FPUs.
Fixed crt0 files to use "jra _ENTRY" as first instruction rather than
"jmp pc@(_ENTRY)" which was getting assembled by gas 2.5.2 as a 68020+
instruction. Note "jmp pc@(_ENTRY:W)" seems to generate the 68000
instruction but a bad jump offset. Added corresponding change to
execve.c to recognize ixemul using executables with this change.
Fixed cpu.h, machdep.c, trap.s to avoid pc relative assembly instruction
that was getting compiled as 68020+ instruction and causing crashes on
68000 machines.
Fixed numerous files that did "#include" of "DEFS.H" rather than "defs.h".
This is an innocuous bug on the Amiga, which is case independent, but
it kills cross compilations.
============
VERSION 41.0
============
No significant changes since the 40.6 beta release other than the
mechanism (and macros) for building debug versions has been cleaned
up and the version number has been bumped to 41.0.
Did include the cat'able man pages back in the source tree, but no
work has been done yet to track down the sources for the man pages
and arrange for them to be properly integrated into the tree and
have the cat'able versions generated from those sources.
============
VERSION 40.6
============
Many bugs have been fixed since the 40.4 release, including a serious
one that was causing memory corruption and many enforcer or mungwall
hits.
Network support has been reintegrated into the library, however it is
still mostly untested. In particular, many functions are only
available for static linking from the libnet.a library. By the next
release, it is expected that libnet.a will be incorporated in libc.a.
Work is underway to merge the best features from at least two
different strains of the ixemul library. Many more changes are
expected by the 41.0 release.
An environment variable called "IXSTACK" is now used to control the
stack size of programs started by system(). If the current stack is
smaller than the value in IXSTACK, the stack is raised to the value
specified in IXSTACK. So IXSTACK is a minimum value.
Automatic stack checking, with a requestor if the stack overflows, is
available for executables compiled with a version of gcc that supports
the -mstackcheck option. This also requires linking with new crt0 and
libc.a.
Automatic stack extension as necessary is available for executables
compiled with a version of gcc that supports the -mstackextend option.
This also requires linking with new crt0 and libc.a.