It addresses a number of problems that were present in earlier
versions.
The calls to the "init" and "fini" functions of shared libraries
have been reordered, so that they are called in a strictly nested
fashion, as is required for C++ constructors and destructors. In
addition, the "init" functions are called in better order relative
to each other. That makes the system more tolerant of C++ programs
which depend on a library's being initialized before its clients.
The dynamic linker is now more tolerant of shared libraries in
which dependencies on other shared libraries are incompletely
recorded.
Cleanup in the event of errors has been improved throughout the
dynamic linker. A number of memory leaks were eliminated.
The warning message for a shared library whose minor version number
is too old has been clarified.
The code dealing with the "ld.so.hints" file has been cleaned up.
A bug that caused the hints file to be unmapped incompletely has
been fixed. A different bug that could potentially cause the hints
file to be mapped on top of a loaded object has been fixed.
The code that searches for shared libraries has been cleaned up.
The searching is now more compatible with that done by SunOS and
SVR4. Also, some unnecessary and useless searches of both the
hints file and library directories have been eliminated.
Reviewed by: nate@freebsd.org
last time. I should have pulled these in last time as it allows easier
comparison of "where we are at" relative to the current version from
cyclic.com. Since this is in a 4.4BSD style tree layout, the changelogs
dont exactly match the file layout, but it's close enough.
-mprofiler-epilogue to support it and documented the option.
cc.1:
Listed all the machine-dependent options, even the temporary
debugging ones.
invoke.texi:
Fixed the sense of -mno-ieee-fp.
Sorted the machine-dependent options.
Two uninitialised variables were causing a phkmalloc warning (another notch
in phkmalloc's belt) and caused the full rcstemplate to not be constructed
for commits on freefall.
(Note that you need to have either done a 'make world' or explicitly
run a 'make distrib-dirs' (in src/etc) to get some needed directories in
/usr/share/examples/cvs to be built.)
plus a couple of minor changes..
Some highlights of the new stuff that was not in the old version:
- remote access support.. full checkout/commit/log/etc..
- much improved dead file support..
- speed improvements
- better $CVSROOT handling
- $Name$ support
- support for a "cvsadmin" group to cut down rampant use of "cvs admin -o"
- safer setuid/setgid support
- many bugs fixed.. :-)
- probably some new ones.. :-(
- more that I cannot remember offhand..
plus a couple of minor changes..
Some highlights of the new stuff that was not in the old version:
- remote access support.. full checkout/commit/log/etc..
- much improved dead file support..
- speed improvements
- better $CVSROOT handling
- $Name$ support
- support for a "cvsadmin" group to cut down rampant use of "cvs admin -o"
- safer setuid/setgid support
- many bugs fixed.. :-)
- probably some new ones.. :-(
- more that I cannot remember offhand..
plus a couple of minor changes..
Some highlights of the new stuff that was not in the old version:
- remote access support.. full checkout/commit/log/etc..
- much improved dead file support..
- speed improvements
- better $CVSROOT handling
- $Name$ support
- support for a "cvsadmin" group to cut down rampant use of "cvs admin -o"
- safer setuid/setgid support
- many bugs fixed.. :-)
- probably some new ones.. :-(
- more that I cannot remember offhand..
vector. Now it is called the "symbol caching" vector. This was made
possible and unconfusing by other changes that allowed me to localize
everything having to do with the caching vector in the function
reloc_map().
Switched to alloca() for allocating the caching vector, and eliminated
the special mmap-based allocation routines. Although this was motivated
by performance reasons, it led to significant simplification of the
code, and made it possible to confine the symbol caching code to the
single function reloc_map().
Got rid of the unnecessary and inefficient division loop at the
beginning of rtld().
Reduced the number of calls to getenv("LD_LIBRARY_PATH") to just 1, on
suggestion from <davidg@root.com>.
Added breaks out of the relocation loops when the relocation address is
found to be 0. A relocation address of 0 is caused by an unused
relocation entry. Unused relocation entries are caused by linking a
shared object with the "-Bsymbolic" switch. The runtime linker itself
is linked that way, and the last 40% of its relocation entries are
unused. Thus, breaking out of the loop on the first such entry is a
performance win when ld.so relocates itself. As a side benefit, it
permits removing a test from md_relocate_simple() in
../i386/md-static-funcs.c.
Unused relocation entries in other shared objects (linked with
"-Bsymbolic") caused even bigger problems in previous versions of the
runtime linker. The runtime linker interpreted the unused entries as if
they were valid. That caused it to perform repeated relocations of the
first byte of the shared object. In order to do that, it had to remap
the text segment writable. Breaking out of the loop on the first unused
relocation entry solves that.
Submitted by: John Polstra <jdp@polstra.com>
