crt0 uses a helper function in a MD src/libexec/ld.so .h file (rather than
reproducing the relevant defines and code in a different place) to perform
minor relocations. If things go very wrong, it would call _dl_exit() --
a locally defined crt0 function which is syscall exit(2). We don't need
to call exit(2) for this obscure case which doesn't happen and provides no
debugging information. An 'abort' is going to provide better information.
So let's change the function name to _dso_abort() and make it a single
illegal instruction.
ok guenther

Nothing depends on archdep.h pulling in other #includes anymore,
so delete the #includes and hide the RELOC_* functions that are
only used by lib/csu behind "#ifdef RCRT0"

these are the ones I tested; kettenis@ was on board with the concept

Delete all the no-op RELOC_GOT() macros and their uses.
Annotate RELOC_DYN() on non-hppa as only used in lib/csu.
Delete some inconsistent comments, adjust whitespace, and reorder
mips64's archdep.h so that the ld.so/*/archdep.h files look
(almost) the same.

ok visa@ kettenis@

Use <elf.h> instead of <elf_abi.h>

ok jasper@, jca@, deraadt@

On fatal errors, kill ourselves with thrkill(0,9,NULL) instead of
simply exiting, via helper functions _dl_die(), _dl_diedie(), and
_dl_oom().

prompted by a complaint from jsing@
ok jsing@ deraadt@

_dl_exit() is __dead, so it should return void.
Move _dl_mmap() and _dl_mquery() inlines from archdep.h to syscall.h and
remove pointless casts and unnecessary parens.

ok kettenis@

Delete ancient macros and unnecessary #includes

ok deraadt@

Remove dependency on __got_{start,end} symbols and look at PT_GNU_RELRO
instead. Result in a few more pages that aren't writable on some platforms
(such as hppa). Based on an initial diff from guenther@.

Thanks to deraadt@ for testing.

ok guenther@

fix types for mmap wrappers. A few whitespace cleanups snuck in.
ok guenther

Simplify the relocation code for the ld.so bootstrap and static pie: track
just the dynamic tags are needed instead of reusing the generic elf_object_t
structure.

testing and feedback from miod@
ok kettenis@

Eliminate RTLD_PROTECT_PLT: ld.so is built with -Bsymbolic so the
PLT is empty/unused. On at least macppc and sparc64, ld.so's attempt
to mprotect its PLT could instead hit its own allocated data and
cause a segfault shortly there after.

While here, take a shot at preventing the same issue with the GOT
by checking for __got_start != __got_end.

reproduction *with ktracing* by afresh1@ provided the key data
ok miod@ deraadt@

Fix handling of hppa RELOC_IPLT relocations during 'bootstrap relocation'.

ok miod@, deraadt@, jsing@

Change define used to deal with PLT protection, use postive logic not negative.
ok mickey@

pefo 3/4 licence cleanups

After relocation is completed, remove write protection from GOT/PLT in ld.so.

Some small fixes in MI code for mips backport. A new reloc md function,
RELOC_GOT, was added to handle mips got bootstrap reloc.

Also remove workaround used on previous versions of binutils for mips.

Add support for REL type relocations, all currently supported arch
use only RELA type relocations, but that could change. ok art@

ok i found it

back out broken stuff until it is fixed

make _dl_mmap() return void * like others

Change ld.so search order/method to match the a.out ld.so.

run destructors on dlclose()

Move more symbols into _dl_ private space, so that the proper (libc)
version of the function will be used.

Add readdir() functionality to perform the proper library searching.

Support DL_PRELOAD

Do not relocate symbols if ld.so is being traced (and will exit).

Misc lint cleanup.

ok art@

various KNF

Perform full relocation for Rela bootstrap relocations, compatible
with newer binutils this way. ok fgs, jason.

cleanup of MD/MI ld.so (elf), most changes by art@ cleanup by me.
tested on alpha sparc64 powerpc.

Part one of userland __P removal. Done with a simple regexp with some minor hand editing to make comments line up correctly. Another pass is forthcoming that handles the cases that could not be done automatically.

Do mmap the right way.

Proper RELOC_RELA for bootstrap.

add munmap syscall
change _rtld references to _dl to match C code.
change relocation types in archdep.h to be sparc64 relocs.

rtld_machine.c copied from alpha, with some modes to compile for sparc64

This is in-tree development.

partially done... committing so other folks don't have to repeat some of the work

Nothing depends on archdep.h pulling in other #includes anymore,
so delete the #includes and hide the RELOC_* functions that are
only used by lib/csu behind "#ifdef RCRT0"

these are the ones I tested; kettenis@ was on board with the concept

Delete all the no-op RELOC_GOT() macros and their uses.
Annotate RELOC_DYN() on non-hppa as only used in lib/csu.
Delete some inconsistent comments, adjust whitespace, and reorder
mips64's archdep.h so that the ld.so/*/archdep.h files look
(almost) the same.

ok visa@ kettenis@

Use <elf.h> instead of <elf_abi.h>

ok jasper@, jca@, deraadt@

On fatal errors, kill ourselves with thrkill(0,9,NULL) instead of
simply exiting, via helper functions _dl_die(), _dl_diedie(), and
_dl_oom().

prompted by a complaint from jsing@
ok jsing@ deraadt@

_dl_exit() is __dead, so it should return void.
Move _dl_mmap() and _dl_mquery() inlines from archdep.h to syscall.h and
remove pointless casts and unnecessary parens.

ok kettenis@

Delete ancient macros and unnecessary #includes

ok deraadt@

Remove dependency on __got_{start,end} symbols and look at PT_GNU_RELRO
instead. Result in a few more pages that aren't writable on some platforms
(such as hppa). Based on an initial diff from guenther@.

Thanks to deraadt@ for testing.

ok guenther@

fix types for mmap wrappers. A few whitespace cleanups snuck in.
ok guenther

Simplify the relocation code for the ld.so bootstrap and static pie: track
just the dynamic tags are needed instead of reusing the generic elf_object_t
structure.

testing and feedback from miod@
ok kettenis@

Eliminate RTLD_PROTECT_PLT: ld.so is built with -Bsymbolic so the
PLT is empty/unused. On at least macppc and sparc64, ld.so's attempt
to mprotect its PLT could instead hit its own allocated data and
cause a segfault shortly there after.

While here, take a shot at preventing the same issue with the GOT
by checking for __got_start != __got_end.

reproduction *with ktracing* by afresh1@ provided the key data
ok miod@ deraadt@

Fix handling of hppa RELOC_IPLT relocations during 'bootstrap relocation'.

ok miod@, deraadt@, jsing@

Change define used to deal with PLT protection, use postive logic not negative.
ok mickey@

pefo 3/4 licence cleanups

After relocation is completed, remove write protection from GOT/PLT in ld.so.

Some small fixes in MI code for mips backport. A new reloc md function,
RELOC_GOT, was added to handle mips got bootstrap reloc.

Also remove workaround used on previous versions of binutils for mips.

Add support for REL type relocations, all currently supported arch
use only RELA type relocations, but that could change. ok art@

ok i found it

back out broken stuff until it is fixed

make _dl_mmap() return void * like others

Change ld.so search order/method to match the a.out ld.so.

run destructors on dlclose()

Move more symbols into _dl_ private space, so that the proper (libc)
version of the function will be used.

Add readdir() functionality to perform the proper library searching.

Support DL_PRELOAD

Do not relocate symbols if ld.so is being traced (and will exit).

Misc lint cleanup.

ok art@

various KNF

Perform full relocation for Rela bootstrap relocations, compatible
with newer binutils this way. ok fgs, jason.

cleanup of MD/MI ld.so (elf), most changes by art@ cleanup by me.
tested on alpha sparc64 powerpc.

Part one of userland __P removal. Done with a simple regexp with some minor hand editing to make comments line up correctly. Another pass is forthcoming that handles the cases that could not be done automatically.

Do mmap the right way.

Proper RELOC_RELA for bootstrap.

add munmap syscall
change _rtld references to _dl to match C code.
change relocation types in archdep.h to be sparc64 relocs.

rtld_machine.c copied from alpha, with some modes to compile for sparc64

This is in-tree development.

partially done... committing so other folks don't have to repeat some of the work

Delete all the no-op RELOC_GOT() macros and their uses.
Annotate RELOC_DYN() on non-hppa as only used in lib/csu.
Delete some inconsistent comments, adjust whitespace, and reorder
mips64's archdep.h so that the ld.so/*/archdep.h files look
(almost) the same.

ok visa@ kettenis@

Use <elf.h> instead of <elf_abi.h>

ok jasper@, jca@, deraadt@

On fatal errors, kill ourselves with thrkill(0,9,NULL) instead of
simply exiting, via helper functions _dl_die(), _dl_diedie(), and
_dl_oom().

prompted by a complaint from jsing@
ok jsing@ deraadt@

_dl_exit() is __dead, so it should return void.
Move _dl_mmap() and _dl_mquery() inlines from archdep.h to syscall.h and
remove pointless casts and unnecessary parens.

ok kettenis@

Delete ancient macros and unnecessary #includes

ok deraadt@

Remove dependency on __got_{start,end} symbols and look at PT_GNU_RELRO
instead. Result in a few more pages that aren't writable on some platforms
(such as hppa). Based on an initial diff from guenther@.

Thanks to deraadt@ for testing.

ok guenther@

fix types for mmap wrappers. A few whitespace cleanups snuck in.
ok guenther

Simplify the relocation code for the ld.so bootstrap and static pie: track
just the dynamic tags are needed instead of reusing the generic elf_object_t
structure.

testing and feedback from miod@
ok kettenis@

Eliminate RTLD_PROTECT_PLT: ld.so is built with -Bsymbolic so the
PLT is empty/unused. On at least macppc and sparc64, ld.so's attempt
to mprotect its PLT could instead hit its own allocated data and
cause a segfault shortly there after.

While here, take a shot at preventing the same issue with the GOT
by checking for __got_start != __got_end.

reproduction *with ktracing* by afresh1@ provided the key data
ok miod@ deraadt@

Fix handling of hppa RELOC_IPLT relocations during 'bootstrap relocation'.

ok miod@, deraadt@, jsing@

Change define used to deal with PLT protection, use postive logic not negative.
ok mickey@

pefo 3/4 licence cleanups

After relocation is completed, remove write protection from GOT/PLT in ld.so.

Some small fixes in MI code for mips backport. A new reloc md function,
RELOC_GOT, was added to handle mips got bootstrap reloc.

Also remove workaround used on previous versions of binutils for mips.

Add support for REL type relocations, all currently supported arch
use only RELA type relocations, but that could change. ok art@

ok i found it

back out broken stuff until it is fixed

make _dl_mmap() return void * like others

Change ld.so search order/method to match the a.out ld.so.

run destructors on dlclose()

Move more symbols into _dl_ private space, so that the proper (libc)
version of the function will be used.

Add readdir() functionality to perform the proper library searching.

Support DL_PRELOAD

Do not relocate symbols if ld.so is being traced (and will exit).

Misc lint cleanup.

ok art@

various KNF

Perform full relocation for Rela bootstrap relocations, compatible
with newer binutils this way. ok fgs, jason.

cleanup of MD/MI ld.so (elf), most changes by art@ cleanup by me.
tested on alpha sparc64 powerpc.

Part one of userland __P removal. Done with a simple regexp with some minor hand editing to make comments line up correctly. Another pass is forthcoming that handles the cases that could not be done automatically.

Do mmap the right way.

Proper RELOC_RELA for bootstrap.

add munmap syscall
change _rtld references to _dl to match C code.
change relocation types in archdep.h to be sparc64 relocs.

rtld_machine.c copied from alpha, with some modes to compile for sparc64

This is in-tree development.

partially done... committing so other folks don't have to repeat some of the work

Use <elf.h> instead of <elf_abi.h>

ok jasper@, jca@, deraadt@

On fatal errors, kill ourselves with thrkill(0,9,NULL) instead of
simply exiting, via helper functions _dl_die(), _dl_diedie(), and
_dl_oom().

prompted by a complaint from jsing@
ok jsing@ deraadt@

_dl_exit() is __dead, so it should return void.
Move _dl_mmap() and _dl_mquery() inlines from archdep.h to syscall.h and
remove pointless casts and unnecessary parens.

ok kettenis@

Delete ancient macros and unnecessary #includes

ok deraadt@

Remove dependency on __got_{start,end} symbols and look at PT_GNU_RELRO
instead. Result in a few more pages that aren't writable on some platforms
(such as hppa). Based on an initial diff from guenther@.

Thanks to deraadt@ for testing.

ok guenther@

fix types for mmap wrappers. A few whitespace cleanups snuck in.
ok guenther

Simplify the relocation code for the ld.so bootstrap and static pie: track
just the dynamic tags are needed instead of reusing the generic elf_object_t
structure.

testing and feedback from miod@
ok kettenis@

Eliminate RTLD_PROTECT_PLT: ld.so is built with -Bsymbolic so the
PLT is empty/unused. On at least macppc and sparc64, ld.so's attempt
to mprotect its PLT could instead hit its own allocated data and
cause a segfault shortly there after.

While here, take a shot at preventing the same issue with the GOT
by checking for __got_start != __got_end.

reproduction *with ktracing* by afresh1@ provided the key data
ok miod@ deraadt@

Fix handling of hppa RELOC_IPLT relocations during 'bootstrap relocation'.

ok miod@, deraadt@, jsing@

Change define used to deal with PLT protection, use postive logic not negative.
ok mickey@

pefo 3/4 licence cleanups

After relocation is completed, remove write protection from GOT/PLT in ld.so.

Some small fixes in MI code for mips backport. A new reloc md function,
RELOC_GOT, was added to handle mips got bootstrap reloc.

Also remove workaround used on previous versions of binutils for mips.

Add support for REL type relocations, all currently supported arch
use only RELA type relocations, but that could change. ok art@

ok i found it

back out broken stuff until it is fixed

make _dl_mmap() return void * like others

Change ld.so search order/method to match the a.out ld.so.

run destructors on dlclose()

Move more symbols into _dl_ private space, so that the proper (libc)
version of the function will be used.

Add readdir() functionality to perform the proper library searching.

Support DL_PRELOAD

Do not relocate symbols if ld.so is being traced (and will exit).

Misc lint cleanup.

ok art@

various KNF

Perform full relocation for Rela bootstrap relocations, compatible
with newer binutils this way. ok fgs, jason.

cleanup of MD/MI ld.so (elf), most changes by art@ cleanup by me.
tested on alpha sparc64 powerpc.

Part one of userland __P removal. Done with a simple regexp with some minor hand editing to make comments line up correctly. Another pass is forthcoming that handles the cases that could not be done automatically.

Do mmap the right way.

Proper RELOC_RELA for bootstrap.

add munmap syscall
change _rtld references to _dl to match C code.
change relocation types in archdep.h to be sparc64 relocs.

rtld_machine.c copied from alpha, with some modes to compile for sparc64

This is in-tree development.

partially done... committing so other folks don't have to repeat some of the work