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Commit Graph

222 Commits

Author SHA1 Message Date
Dimitry Andric
4f78aa4725 Work around an issue on 32-bit PowerPC, where clang executable can get
too big, causing 'relocation truncated to fit' errors at link time.

Reviewed by:	nwhitehorn
2012-04-16 21:36:55 +00:00
Nathan Whitehorn
cce345c2c9 Work around a binutils bug on powerpc64 where the TOC would not be
properly reloaded when calling _fini() in large binaries with multiple
TOC sections (e.g. GCC), leading to a segmentation fault. Adding -mlongcall
to crt1 flags causes the compiler to emit explicit TOC load instructions
for all function calls, including _fini().

Reviewed by:	kib
Pointy hat to:	kib
2012-03-13 18:59:19 +00:00
Konstantin Belousov
a22748dbd9 Stop calling _init/_fini methods from crt1 for dynamic binaries. Do
call preinit, init and fini arrays methods from crt1 for static binaries.

Mark new crt1 with FreeBSD-specific ELF note.

Move some common crt1 code into new MI file ignore_init.c, to reduce
duplication.  Also, conservatively adjust nearby sources for style.

Reviewed by:	kan
Tested by:	andrew (arm), flo (sparc64)
MFC after:	3 weeks
2012-03-11 20:04:09 +00:00
Konstantin Belousov
d1545c15cf Add a header with definitions useful for constructing ELF notes.
Reviewed by: kan
MFC after:   3 weeks
2012-03-11 19:56:58 +00:00
Oleksandr Tymoshenko
dae259f8c4 - Remove one more no-op #ifndef 2012-03-06 19:19:33 +00:00
Oleksandr Tymoshenko
dd2f96800b - Remove NOSHARED parts since it seems to be no-op
- Call _init_tls for statically linked binaries
2012-03-06 03:29:46 +00:00
Nathan Whitehorn
68a108e626 Build Scrt.o on powerpc64. Its introduction on other platforms got lost
during the period of time the powerpc64 port was on a project branch.
2011-06-27 16:24:36 +00:00
Nathan Whitehorn
79c77d726e Turn off default generation of userland dot symbols on powerpc64 now that
we have a binutils that supports it. Kernel dot symbols remain on to assist
DDB.
2011-02-18 21:44:53 +00:00
Warner Losh
41ea72bd1d Whitespace nit 2011-02-01 22:50:23 +00:00
Konstantin Belousov
33e6b543c7 Mark csu on PowerPC as not requiring executable stack.
Reviewed and tested by:	nwhitehorn
2011-01-14 11:34:58 +00:00
Konstantin Belousov
ea40bc90e1 The (%esp & 0xf) == 0 should be true before the call instruction is
executed, for the properly aligned stack.

Reported and tested by:	rstone
Pointy hat to:	kib
MFC after:	3 days
2011-01-13 23:00:22 +00:00
Dimitry Andric
9ef4e3afcb Apply a workaround for a binutils issue with the .note.ABI-tag section
generated from lib/csu/common/crtbrand.c (which ultimately ends up in
executables and shared libraries, via crt1.o, gcrt1.o or Scrt1.o).

For all arches except sparc, gcc emits the section directive for the
abitag struct in crtbrand.c with a PROGBITS type.  However, newer
versions of binutils (after 2.16.90) require the section to be of NOTE
type, to guarantee that the .note.ABI-tag section correctly ends up in
the first page of the final executable.

Unfortunately, there is no clean way to tell gcc to use another section
type, so crtbrand.c (or the C files that include it) must be compiled in
multiple steps:

- Compile the .c file to a .s file.
- Edit the .s file to change the 'progbits' type to 'note', for the section
  directive that defines the .note.ABI-tag section.
- Compile the .s file to an object file.

These steps are done in the invididual Makefiles for each applicable arch.

Reviewed by:	kib
2011-01-13 20:44:31 +00:00
Konstantin Belousov
88c23d858b Add section .note.GNU-stack for assembly files used by 386 and amd64. 2011-01-07 16:07:51 +00:00
Tijl Coosemans
b0032ab5f8 Add a .note.ABI-tag section to ia64 startup files by linking crtbrand.c
in crt1.o. On other architectures crtbrand.c is included from crt1.c,
but that's not a C source code file on ia64. Instead it is compiled
separately and included in crt1.o using incremental linking.

Tested by:	dim (previous version)
Approved by:	kib (mentor)
2010-12-10 08:53:06 +00:00
Dimitry Andric
cbbcfbf8b7 Let all .c and .S files under lib/csu consistently use the __FBSDID()
macro for identification, instead of several different hand-rolled
variants (plain .ident, .ascii, etc).
2010-12-09 21:31:21 +00:00
Dimitry Andric
73438aeedc Remove two .endp's without matching .proc in lib/csu/ia64/crtn.S.
This allows it to assemble with newer binutils.

Reviewed by:	marcel
2010-10-15 21:40:20 +00:00
Nathan Whitehorn
282e37622c C startup support for 64-bit PowerPC.
Obtained from:	projects/ppc64
2010-07-10 03:45:55 +00:00
Konstantin Belousov
5c1a5e740f Add unwind annotations to the asm part of crt1 on i386. Terminate the
process with SIGTRAP if _start1() unexpectedly returns.

Reviewed by:	kan
MFC after:	2 weeks
2010-06-18 11:10:39 +00:00
Jilles Tjoelker
1e17fbd3d9 Do not create *.gmon files for PIE executables on i386.
Scrt1_c.o was accidentally compiled with -DGCRT (profiling), like gcrt1_c.o.
This problem is i386-specific, the other architectures are OK.

If you have problems with PIE executables such as samba and cups leaving
behind gmon files, rebuild them after installing this change.

PR:		ports/143924
Reviewed by:	kib
MFC after:	3 days
2010-03-20 22:58:54 +00:00
Juli Mallett
ebe2e5dca3 Fix spelling of noreorder. 2010-03-13 02:10:20 +00:00
Ulrich Spörlein
03dab16e1d Use default WARNS setting (of 6) for lib/csu.
PR:		bin/140089
Reviewed by:	jmallett
Approved by:	ed (co-mentor)
2010-03-05 13:29:05 +00:00
Ulrich Spörlein
98b77738b8 Properly declare non-extern functions in crt1
Also move the declarations after __progname consistently to
make the distinction clearer.

Reviewed by:	jmallett
Approved by:	ed (co-mentor)
2010-03-05 13:28:05 +00:00
Warner Losh
75b2bd679b Use ABI neutral macrosa
Submitted by:	jmallet
2010-03-03 21:59:23 +00:00
Warner Losh
800b5ba27d __main and __gccmain are no longer required, so eliminate them.
Submitted by:	jmallet@
2010-03-03 21:54:49 +00:00
Ed Schouten
daaf575910 Build lib/ with WARNS=6 by default.
Similar to libexec/, do the same with lib/. Make WARNS=6 the norm and
lower it when needed.

I'm setting WARNS?=0 for secure/. It seems secure/ includes the
Makefile.inc provided by lib/. I'm not going to touch that directory.
Most of the code there is contributed anyway.
2010-01-02 09:58:07 +00:00
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