there is a super-alignment between btext and text, this creates a hole.
Twice, I have seen the sigtramp mapping land inside that hole. This
causes grief for the upcoming pinsyscalls() work which operates on
address space ranges. But the micro-optimization is silly.
ok kettenis

For strange reasons which made sense at the time, the text segment was
placed head of the btext (boot.text) segment. (the boot.text segment is
"unmapped" after initization, as a self-protection mechanism). this meant
the LOAD's virtual addresses were not in sequence, which clearly isn't
what we intended.

Populate the non-LOAD openbsd.syscalls section (and PT_OPENBSD_SYSCALL)
with {uint offset, uint syscall#} entries in libc & ld.so.
In libc a few syscall# entries (break, sigprocmask, _tfork, _threxit)
are duplicated because additional or inline uses occur (that situation
is handled elsewhere)
ok kettenis

unify spacing for LOAD FLAGS lines

Use proper sparc64 illtrap instruction as text sections filler, rather than
the x86 one.

force-disable jump tables in ld.so building on sparc64, to ease the
exonly transition for people building through an upcoming commit series

Since the introduction of automatic immutable from the kernel, the munmap()
of ld.so boot.text region is now (silently) failing because the region is
contained within the text LOAD, which is immutable. So create a new btext
LOAD with flags PF_X|PF_R|PF_OPENBSD_MUTABLE, and place all boot.text objects
in there. This LOAD must also be page-aligned so it doesn't skip unmapping
some of the object region, previously it was hilariously unaligned.
ok kettenis and guenther seemed to like it also
This one is for powerpc64 and a modified version of the diff deraadt@ mailed
out to make sure the LOADs are in increasing address order.
this is the version for sparc64, tested by pascal also

ld.so boot cleanup support:
- put functions and data which are only used before calling the executable's
start function into their own page-aligned segments for unmapping
(only done on amd64, arm64, armv7, powerpc, and sparc64 so far)
- pass .init_array and .preinit_array functions an addition argument which
is a callback to get a structure which includes a function that frees
the boot text and data
- sometimes delay doing RELRO processing: for a shared-object marked
DF_1_INITFIRST do it after the object's .init_array, for the executable
do it after the .preinit_array
- improve test-ld.so to link against libpthread and trigger its initialization
late
libc changes to use this will come later

ok kettenis@

Populate the non-LOAD openbsd.syscalls section (and PT_OPENBSD_SYSCALL)
with {uint offset, uint syscall#} entries in libc & ld.so.
In libc a few syscall# entries (break, sigprocmask, _tfork, _threxit)
are duplicated because additional or inline uses occur (that situation
is handled elsewhere)
ok kettenis

unify spacing for LOAD FLAGS lines

Use proper sparc64 illtrap instruction as text sections filler, rather than
the x86 one.

force-disable jump tables in ld.so building on sparc64, to ease the
exonly transition for people building through an upcoming commit series

Since the introduction of automatic immutable from the kernel, the munmap()
of ld.so boot.text region is now (silently) failing because the region is
contained within the text LOAD, which is immutable. So create a new btext
LOAD with flags PF_X|PF_R|PF_OPENBSD_MUTABLE, and place all boot.text objects
in there. This LOAD must also be page-aligned so it doesn't skip unmapping
some of the object region, previously it was hilariously unaligned.
ok kettenis and guenther seemed to like it also
This one is for powerpc64 and a modified version of the diff deraadt@ mailed
out to make sure the LOADs are in increasing address order.
this is the version for sparc64, tested by pascal also

ld.so boot cleanup support:
- put functions and data which are only used before calling the executable's
start function into their own page-aligned segments for unmapping
(only done on amd64, arm64, armv7, powerpc, and sparc64 so far)
- pass .init_array and .preinit_array functions an addition argument which
is a callback to get a structure which includes a function that frees
the boot text and data
- sometimes delay doing RELRO processing: for a shared-object marked
DF_1_INITFIRST do it after the object's .init_array, for the executable
do it after the .preinit_array
- improve test-ld.so to link against libpthread and trigger its initialization
late
libc changes to use this will come later

ok kettenis@

unify spacing for LOAD FLAGS lines

Use proper sparc64 illtrap instruction as text sections filler, rather than
the x86 one.

force-disable jump tables in ld.so building on sparc64, to ease the
exonly transition for people building through an upcoming commit series

Since the introduction of automatic immutable from the kernel, the munmap()
of ld.so boot.text region is now (silently) failing because the region is
contained within the text LOAD, which is immutable. So create a new btext
LOAD with flags PF_X|PF_R|PF_OPENBSD_MUTABLE, and place all boot.text objects
in there. This LOAD must also be page-aligned so it doesn't skip unmapping
some of the object region, previously it was hilariously unaligned.
ok kettenis and guenther seemed to like it also
This one is for powerpc64 and a modified version of the diff deraadt@ mailed
out to make sure the LOADs are in increasing address order.
this is the version for sparc64, tested by pascal also

ld.so boot cleanup support:
- put functions and data which are only used before calling the executable's
start function into their own page-aligned segments for unmapping
(only done on amd64, arm64, armv7, powerpc, and sparc64 so far)
- pass .init_array and .preinit_array functions an addition argument which
is a callback to get a structure which includes a function that frees
the boot text and data
- sometimes delay doing RELRO processing: for a shared-object marked
DF_1_INITFIRST do it after the object's .init_array, for the executable
do it after the .preinit_array
- improve test-ld.so to link against libpthread and trigger its initialization
late
libc changes to use this will come later

ok kettenis@

Use proper sparc64 illtrap instruction as text sections filler, rather than
the x86 one.

force-disable jump tables in ld.so building on sparc64, to ease the
exonly transition for people building through an upcoming commit series

Since the introduction of automatic immutable from the kernel, the munmap()
of ld.so boot.text region is now (silently) failing because the region is
contained within the text LOAD, which is immutable. So create a new btext
LOAD with flags PF_X|PF_R|PF_OPENBSD_MUTABLE, and place all boot.text objects
in there. This LOAD must also be page-aligned so it doesn't skip unmapping
some of the object region, previously it was hilariously unaligned.
ok kettenis and guenther seemed to like it also
This one is for powerpc64 and a modified version of the diff deraadt@ mailed
out to make sure the LOADs are in increasing address order.
this is the version for sparc64, tested by pascal also

ld.so boot cleanup support:
- put functions and data which are only used before calling the executable's
start function into their own page-aligned segments for unmapping
(only done on amd64, arm64, armv7, powerpc, and sparc64 so far)
- pass .init_array and .preinit_array functions an addition argument which
is a callback to get a structure which includes a function that frees
the boot text and data
- sometimes delay doing RELRO processing: for a shared-object marked
DF_1_INITFIRST do it after the object's .init_array, for the executable
do it after the .preinit_array
- improve test-ld.so to link against libpthread and trigger its initialization
late
libc changes to use this will come later

ok kettenis@

Since the introduction of automatic immutable from the kernel, the munmap()
of ld.so boot.text region is now (silently) failing because the region is
contained within the text LOAD, which is immutable. So create a new btext
LOAD with flags PF_X|PF_R|PF_OPENBSD_MUTABLE, and place all boot.text objects
in there. This LOAD must also be page-aligned so it doesn't skip unmapping
some of the object region, previously it was hilariously unaligned.
ok kettenis and guenther seemed to like it also
This one is for powerpc64 and a modified version of the diff deraadt@ mailed
out to make sure the LOADs are in increasing address order.
this is the version for sparc64, tested by pascal also

ld.so boot cleanup support:
- put functions and data which are only used before calling the executable's
start function into their own page-aligned segments for unmapping
(only done on amd64, arm64, armv7, powerpc, and sparc64 so far)
- pass .init_array and .preinit_array functions an addition argument which
is a callback to get a structure which includes a function that frees
the boot text and data
- sometimes delay doing RELRO processing: for a shared-object marked
DF_1_INITFIRST do it after the object's .init_array, for the executable
do it after the .preinit_array
- improve test-ld.so to link against libpthread and trigger its initialization
late
libc changes to use this will come later

ok kettenis@