Commit Graph

197 Commits

Author SHA1 Message Date
Konstantin Belousov
c09ba32715 Properly support -fPIE by linking PIE binaries with specially-built
Scrt1.o instead of crt1.o, since the later is built as non-PIC.

Separate i386-elf crt1.c into the pure assembler part and C code,
supplying all data extracted by assembler stub as explicit parameters [1].
Hide and localize _start1 symbol used as an interface between asm and
C code.

In collaboration with:	kan
Inspired by:	PR i386/127387 [1]
Prodded and tested by:	rdivacky [1]
MFC after:	3 weeks
2009-12-02 16:34:20 +00:00
Ruslan Ermilov
d9ca85fca7 Fix build when WITH_SSP is set explicitly.
Submitted by:	Jeremie Le Hen
2009-02-21 15:04:31 +00:00
Konstantin Belousov
af8d325c77 Add -fno-omit-frame-pointer to CFLAGS used to compile crt1.c on amd64.
For gcc' __builtin_frame_address() to work, all call frames need to save
frame pointer. In particular, this is important for the upper frame that
should terminate the chain.

No objections from:	jhb
PR:	amd64/126543
MFC after:	1 week
2008-08-22 09:23:39 +00:00
Ruslan Ermilov
042df2e2da Enable GCC stack protection (aka Propolice) for userland:
- It is opt-out for now so as to give it maximum testing, but it may be
  turned opt-in for stable branches depending on the consensus.  You
  can turn it off with WITHOUT_SSP.
- WITHOUT_SSP was previously used to disable the build of GNU libssp.
  It is harmless to steal the knob as SSP symbols have been provided
  by libc for a long time, GNU libssp should not have been much used.
- SSP is disabled in a few corners such as system bootstrap programs
  (sys/boot), process bootstrap code (rtld, csu) and SSP symbols themselves.
- It should be safe to use -fstack-protector-all to build world, however
  libc will be automatically downgraded to -fstack-protector because it
  breaks rtld otherwise.
- This option is unavailable on ia64.

Enable GCC stack protection (aka Propolice) for kernel:
- It is opt-out for now so as to give it maximum testing.
- Do not compile your kernel with -fstack-protector-all, it won't work.

Submitted by:	Jeremie Le Hen <jeremie@le-hen.org>
2008-06-25 21:33:28 +00:00
Oleksandr Tymoshenko
32d7197a6d Bring C runtime bits for FreeBSD/mips from p4 mips2-jnpr branch.
Approved by:	cognet (mentor)
2008-05-03 11:16:32 +00:00
Konstantin Belousov
11ddf4fd56 The __used (== __attribute__((__used)) ) silences the warning produced
by unreferenced symbol. Apply __used instead of rev. 1.5.

Requested by:	kan
2007-12-04 12:18:43 +00:00
Konstantin Belousov
fb76e092de Restore the branding of the ELF executables. The structure was optimized out.
MFC after:	3 days
2007-12-03 13:21:21 +00:00
Kip Macy
b84c7a797c Fix TLS on sparc64 for statically and dynamically linked binaries
Approved by: rwatson (mentor)
Reviewed by: jmg and marcel
2006-10-08 02:50:34 +00:00
Ruslan Ermilov
2b46c64c9c Remove alpha left-overs. 2006-08-22 08:03:01 +00:00
Marius Strobl
bb4e1f9101 GC these crt{begin,end}.c, which are unused since the last FreeBSD platform
switched to those created from GCC's crtstuff.c 4 years ago.
2006-05-22 19:30:02 +00:00
Bruce Evans
d31f7e4991 Fixed profiling of main() for amd64 and i386. This started rotting
in 1993 in rev.1.5 of the i386 a.out version (csu/i386/crt0.c).
Profiling uses a magic label "eprol" to delimit the start of the part
of the text section covered by profiling.  This label must be placed
before the call to main() to get main() properly profiled.  It was
placed there in rev.1.1 of crt0.c.  Rev.1.5 imported the initial
implementation of shared libraries in FreeBSD and misplaced the label.
Fortunately, the misplaced label was misspelled and the old label
wasn't removed, so the new label had no effect.  Unfortunately, when
profiling was implemented for the ELF in 1998 in rev.1.2 of
csu/i386-elf/crt1.c, only the incorrectly placed label was copied
(after fixing its name).  The bug was then copied to all other arches.
The label seems to be still misplaced in NetBSD for most arches.  It
is in common.c for most arches so it is even further from being inside
the function that calls main().

I think "eprol" is short for "end of prologue", but it must be placed
before the end of the prologue so that it covers main().  crt0.c has
it before the calls atexit(_mcleanup) and monstartup(...), but it
cannot affect these calls so I moved it after the call to monstartup().
It now also covers the call to _init() but not the newer call to
_init_tls().  Profiling of _init() seems to be harmless, and the call
to _init_tls() seems to be misplaced.

Reviewed by:	jdp (long ago, for a slightly different i386 version)
2005-10-07 22:13:17 +00:00
Doug Rabson
6f21c8127a Align the stack to a 16 byte boundary so that we can safely call functions
that use SSE. The compiler does attempt to do this in main() but not very
successfully - it still manages to use unaligned offsets from %ebp in some
cases. Also we need to have an aligned stack in case something uses SSE
via _init().

MFC After: 1 week
2005-05-19 07:36:07 +00:00
Doug Rabson
0ff6455012 Keep the stack aligned to a 16 byte boundary when calling init functions
so that we don't cause a bus error if they start storing SSE math stuff
on the stack.

MFC After: 1 week
2005-05-19 07:31:06 +00:00
Tom Rhodes
35e43d9cad Remnant code (broken, unhooked) from a.out which I missed.
Noticed by:	ru
2005-01-11 18:35:40 +00:00
Olivier Houchard
eed605e0fe Implement .init and .fini. 2004-09-23 23:00:51 +00:00
Doug Rabson
4a5a97e625 Back out the call to _init_tls() - something is broken there and it
prevents all static binaries from running.
2004-08-21 08:22:00 +00:00
Marcel Moolenaar
e8e41d4cf8 Bring ia64 back from the dead. After a call one needs to restore the
GP register, because it's clobbered for calls across load modules. The
previous commit inserted the call to _init_tls() between the call to
atexit() and the restoration of the GP register clobbered by it. Fix:
restore GP before we call _init_tls().

Pointy hat: dfr@
2004-08-18 23:06:47 +00:00
Doug Rabson
ccd13c49b5 Add support for TLS in statically linked programs. 2004-08-15 16:18:52 +00:00
Olivier Houchard
dcb6ad76e0 C runtime support for FreeBSD/arm. 2004-05-14 12:19:04 +00:00
Peter Wemm
c50be14baa Adjust stack alignment so that when the 'call xxx' functions are
gathered into the middle of the _init and _fini sections, they get
executed with their expected stack alignment.
2004-03-21 01:39:01 +00:00
Ruslan Ermilov
8900255ef4 The <bsd.files.mk> API seems the best to use here. 2004-01-20 13:31:35 +00:00
Peter Wemm
3efeb2b693 Explicitly specify an alignment for abitag. Without it, gcc specifies a
section alignnment of 16 bytes for amd64 and this breaks file(1).
Before:
./cp: ELF 64-bit LSB executable, AMD x86-64, version 1 (FreeBSD), for \
  FreeBSD 127.7.9, statically linked, stripped
after:    ^^^^^^^
./ls: ELF 64-bit LSB executable, AMD x86-64, version 1 (FreeBSD), for \
  FreeBSD 5.0.1, dynamically linked (uses shared libs), stripped

The reason for this is that the NOTE sections are not contiguous
internally.  If the note section has an alignment of 16, then anything
that looks for the data is supposed to round up the payload start to
the next multiple of the alignment.  But FreeBSD/amd64 broke because the
structure is declared as a single structure, not a (header,payload) group,
where the payload had an explicit alignment roundup.

The alternative is to change things like file(1) to ignore the ELF payload
alignment rules for the PT_NOTE section only for FreeBSD.
2003-10-17 15:43:13 +00:00
Marcel Moolenaar
29cc06cf27 Fix typo: Passing the first argument to exit() in out2 does not work.
Trust me.
2003-07-15 03:50:38 +00:00
Marcel Moolenaar
68d0d87b81 _start() needed to be written in assembly. See crt1.S. 2003-07-14 03:05:42 +00:00
Marcel Moolenaar
db7ffe67c6 Rewite _start(). We cannot use a C function due to the fact that we
don't call it according to the runtime specification and especially
WRT to gp this can cause trouble. The gcc 3.3.1 import broke the
ia64 runtime because the compiler saved gp prior to us being able
to set it properly. Restoring gp after the calls would then invalidate
gp and cause segmentation faults later on.
By rewriting _start() as an assembly function, we also avoided even
more gcc dependences, by trying to use gcc specific features to work
around the problem.
This version of _start() does not reference _DYNAMIC. We register the
cleanup function when it's a non-NULL pointer. The kernel will always
pass a NULL pointer and dynamic linkers may pass a non-NULL pointer.

The machine independent code to set __progname now unfortunately is
written in assembly. So be it.
2003-07-13 23:11:37 +00:00
Ruslan Ermilov
6de4623bfe MFi386: revision 1.19. 2003-06-30 12:53:39 +00:00
Bruce Evans
c749b4f6dd Removed garbage:
- -elf in CFLAGS had no effect except to reduce portability.
- -elf in LDFLAGS had even less effect, since LDFLAGS is not used.
- -Wall in CFLAGS had no effect except to reduce portability and break
  overriding of WARNS, since the setting of WARNS implies -Wall.
2003-06-04 11:21:18 +00:00
David E. O'Brien
1628730478 This is now Gcc 3.3 WARNS 6 clean. 2003-05-04 18:34:00 +00:00
David E. O'Brien
bbe4999bd1 Set abitag __unused. 2003-05-04 18:33:26 +00:00
Peter Wemm
1b376078fd Update for AMD64. repocopied from i386-elf/crt1.c. Deal with regparm
argument passing rather than stack based args.  The kernel passes the
base of the argument/env vector in %rdi (arg1).
2003-04-30 19:27:07 +00:00
Mark Murray
7c55188ab2 Very minor EOL whitespace diff-reducer. 2003-01-26 23:34:47 +00:00
Mark Murray
aa4e3f3e5a Missed a bit of cleanup. 2003-01-26 23:29:22 +00:00
Mark Murray
818c8b696b make these more useful for lint(1). Minor diff-reductions while I'm
about it.
2003-01-26 23:14:47 +00:00
Mark Murray
34893fe49b Remove the get_term() function. It pretty much can't work for
FreeBSD, and makes ugly diffs with the other crt1.c's. Leave
behind a comment (words supplied by Thomas Moestl) that explain
the issue.

OK'ed by:	tmm
2003-01-26 23:01:36 +00:00
Bruce Evans
4ce32d5dee Backed out previous commit (alignment suitable for RELENG_4) as planned
since it has been MFC'ed.  See the log message for the previous commit
for more details.  The alignment bug in gcc-3 has not been fixed, but
it is not very serious and the previous commit just moved it (as intended).

Approved by:	re (murray)
2002-12-01 17:36:18 +00:00
Bruce Evans
fb0be37ded Align the stack suitably for the version of gcc in FreeBSD-4 (provided
-fomit-frame-pointer is not used).  This is mostly moot for -current
because gcc-3 does the alignment (slightly incorrectly) in main().

This patch is intended for easy MFC'ing and should be backed out in
-current soon since it causes compiler warnings and better fixes are
possible in -current.  The best fix is to do nothing here and wait for
gcc to do stack alignment right.  gcc-3 aligns the stack in main(), but
does it too late for main()'s local variables and too late for anything
called before main().  A misaligned stack is now more than an efficiency
problem, since some SSE instructions in some or all (hardware)
implementations trap on misaligned operands even if alignment checking
is not enabled.

PR:		41528:
Submitted by:	NIIMI Satoshi <sa2c@sa2c.net> (original version)
MFC after:	3 days
2002-09-29 13:42:27 +00:00
Mark Murray
7ec538840c Remove a prototype for a function that is no longer called. 2002-09-20 22:23:32 +00:00
Jake Burkholder
aa41a4bc92 Don't need to install the signal trampoline here anymore. 2002-09-03 14:59:41 +00:00
Ruslan Ermilov
d2893b161b Drop support for COPY, -c has been the default mode of install(1)
for a long time now.

Approved by:	bde
2002-07-29 09:40:17 +00:00
Mark Murray
828191256b The main reason for this is to reduce diffs between all the crt1.c's.
Assembler macros are tidied up and made as similar as sanely possible.
The macros are translated into C (__inline static) functions for lint.

Declaration orders are made the same.
Declarations are all ISOfied and tidied up.

Comment contents have gratuitous diffs removed.

The net result is a bunch of crt1.c's that are 90% the same.
It may be possible to now encapsulate the differences in one
MD header, and have only one MI crt1.c file (although the macros
to do this may be ugly).

Helpful comments by:	obrien, bde
Alpha tested by:	des
i386-elf tested by:	markm
2002-07-16 12:28:50 +00:00
Mark Murray
ccece3d626 Whitespace diffs only; this brings this file into the same whitespace
convention as src/lib/csu/*/crt1.c.

This will make the follow up diffs easier to see and extract.
2002-07-03 14:42:39 +00:00
David E. O'Brien
c02ba8a8d2 WARNS=6'ify.
Style nits.
2002-06-25 18:05:16 +00:00
David E. O'Brien
ad275bd760 Prototype _start.
Submitted by:	markm

Mark some _start formal parameters __unused.
2002-06-25 18:01:12 +00:00
David E. O'Brien
d03f581f32 Use .rodata section for $FreeBSD$. 2002-05-15 04:19:49 +00:00
Ruslan Ermilov
2020063860 Fixed CLEANFILES after bsd.lib.mk sweep. 2002-05-13 15:28:00 +00:00
Ruslan Ermilov
7893b524b9 SOBJS are not used here for a long time, and were just
pessimising the `install'.
2002-05-13 11:51:11 +00:00
Ruslan Ermilov
2a53f3fb35 Major cleanup of bsd.lib.mk.
Get rid of the INTERNALSTATICLIB knob and just use plain INTERNALLIB.
INTERNALLIB now means to build static library only and don't install
anything.  Added a NOINSTALLLIB knob for libpam/modules.  To not
build any library at all, just do not set LIB.
2002-05-13 10:53:24 +00:00
Ruslan Ermilov
5b8f41af39 Revert the last change. The corresponding bsd.lib.mk changes were
already backed out.
2002-05-12 16:21:23 +00:00
David E. O'Brien
785b36d40f Use the simpler NOMAN rather than NOMAN, NOPIC, NOPROFILE, INTERNALLIB. 2002-05-11 17:45:03 +00:00
David E. O'Brien
471b107936 Use the compiler's crt{begin,end}. 2002-05-10 01:36:29 +00:00