On 23.09.18 22:41, Andreas Tobler wrote:
Hi Brooks,
On 06.09.18 01:23, Brooks Davis wrote:
Author: brooks
Date: Wed Sep 5 23:23:16 2018
New Revision: 338486
URL: https://svnweb.freebsd.org/changeset/base/338486
Log:
Rework rtld's TLS Variant I implementation to match r326794
The above commit fixed handling overaligned TLS segments in libc's
TLS Variant I implementation, but rtld provides its own implementation
for dynamically-linked executables which lacks these fixes. Thus,
port these changes to rtld.
This was previously commited as r337978 and reverted in r338149 due to
exposing a bug the ARM rtld. This bug was fixed in r338317 by mmel.
Submitted by: James Clarke
Approved by: re (kib)
Reviewed by: kbowling
Testing by: kbowling (powerpc64), br (riscv), kevans (armv7)
And no testing on powerpc?
This patch breaks ppc-32. It makes the system unusable, one can not even
login. Neither on the console nor via ssh. After entering the user I get
flooded with backslashes and the login shell dumps core. (Only visible
if I netboot)
I'm testing now a fix and see if it survives world and kernel build.
Modified: head/libexec/rtld-elf/powerpc/rtld_machdep.h
==============================================================================
--- head/libexec/rtld-elf/powerpc/rtld_machdep.h Wed Sep 5 21:47:22
2018 (r338485)
+++ head/libexec/rtld-elf/powerpc/rtld_machdep.h Wed Sep 5 23:23:16
2018 (r338486)
@@ -74,10 +74,11 @@ void _rtld_powerpc_pltcall(void);
#define round(size, align) \
(((size) + (align) - 1) & ~((align) - 1))
#define calculate_first_tls_offset(size, align) \
- round(8, align)
+ TLS_TCB_SIZE
Here, if I revert to 'round(8, align)', I can login again. But the fix
I'm testing now, is to increase the TLS_TCB_SIZE to 16 as suggested by
Justin.
I'll let you know how it goes.
So, here the feedback.
Additional testing showed that increasing the TLS_TCB_SIZE is not
enough. I have the below snippet which lets me build world/kernel and do
some portmaster updates.
If I use TLS_TCB_SIZE in calculate_first_tls_offset I get a system where
I can login, but when I try to run 'portmaster' with arguments I get
'operator expected' on a option which works on other archs.
Putting in round(8, align) instead of TLS_TCB_SIZE makes portmaster work
again.
And if I leave TLS_TCB_SIZE with 8, and only bring back round(8, align)
is also not sufficient.
I rebuild a few things again and then I propose the below for -CURRENT
to re@. Unless someone else has a better idea.
Regards,
Andreas
Index: libexec/rtld-elf/powerpc/rtld_machdep.h
===================================================================
--- libexec/rtld-elf/powerpc/rtld_machdep.h (revision 338919)
+++ libexec/rtld-elf/powerpc/rtld_machdep.h (working copy)
@@ -69,12 +69,12 @@
#define TLS_TP_OFFSET 0x7000
#define TLS_DTV_OFFSET 0x8000
-#define TLS_TCB_SIZE 8
+#define TLS_TCB_SIZE 16
#define round(size, align) \
(((size) + (align) - 1) & ~((align) - 1))
#define calculate_first_tls_offset(size, align) \
- TLS_TCB_SIZE
+ round(8, align)
#define calculate_tls_offset(prev_offset, prev_size, size, align) \
round(prev_offset + prev_size, align)
#define calculate_tls_end(off, size) ((off) + (size))
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