https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #18 from Thomas Garnier ---
Ok. Opened: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84011
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #17 from H.J. Lu ---
(In reply to Thomas Garnier from comment #16)
> Yes, I think you can't just default to the non-PIE mode.
>
> Clang does it well though:
>
> :
>0: 83 ff 16cmp$0x16,%edi
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #16 from Thomas Garnier ---
Yes, I think you can't just default to the non-PIE mode.
Clang does it well though:
:
0: 83 ff 16cmp$0x16,%edi
3: 77 0f ja 14
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #15 from H.J. Lu ---
(In reply to Thomas Garnier from comment #14)
> Correcting what I said before, it is about re-enabling switch folding (or
> switch optimization).
>
> Basically without PIE (-fno-PIE) with -O2, a switch can be
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #14 from Thomas Garnier ---
Correcting what I said before, it is about re-enabling switch folding (or
switch optimization).
Basically without PIE (-fno-PIE) with -O2, a switch can be optimized to be:
:
0: b8
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #13 from Thomas Garnier ---
Created attachment 43223
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43223=edit
testcase for switch folding
No switch folding if built with:
$CC -O2 -fno-PIE -c -o switch ./switch.c
Switch
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #12 from H.J. Lu ---
(In reply to Thomas Garnier from comment #11)
> I think for this file using only -mcmodel=large makes more sense.
>
> Given the proposed option (-fstatic-pie) is not kernel specific, the TLS is
Sounds
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #11 from Thomas Garnier ---
I think for this file using only -mcmodel=large makes more sense.
Given the proposed option (-fstatic-pie) is not kernel specific, the TLS is not
needed. What do you think about disabling optimization
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #10 from H.J. Lu ---
(In reply to Thomas Garnier from comment #9)
> I tested the change against a modified version of the proposed Linux x86_64
> PIE support. The changes removes all the PLT32 and GOT64 entry but I still
> get
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #9 from Thomas Garnier ---
I tested the change against a modified version of the proposed Linux x86_64 PIE
support. The changes removes all the PLT32 and GOT64 entry but I still get
R_X86_64_GOTPC64 & R_X86_64_GOTOFF64 relocations on
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
Thomas Garnier changed:
What|Removed |Added
Attachment #43189|0 |1
is obsolete|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #7 from Thomas Garnier ---
Created attachment 43189
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43189=edit
testcase for mcmodel=large
Build with: gcc -mcmodel=large -c -fstatic-pie ./test.c -o test
Dump relocations on the
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #6 from H.J. Lu ---
(In reply to Thomas Garnier from comment #5)
> I didn't try the patch yet, that could be a good starting point (still need
> change in switch optimization and segment registers). What is the
> consequence of the
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #5 from Thomas Garnier ---
I didn't try the patch yet, that could be a good starting point (still need
change in switch optimization and segment registers). What is the consequence
of the change in default_binds_local_p_3? Is it
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #4 from H.J. Lu ---
(In reply to Kees Cook from comment #3)
> Any progress on getting this into a GCC release?
Has anyone tried my patch at all? Does it work?
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
Kees Cook changed:
What|Removed |Added
CC||kees at outflux dot net
--- Comment #3 from
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
H.J. Lu changed:
What|Removed |Added
Status|UNCONFIRMED |NEW
Last reconfirmed|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #2 from H.J. Lu ---
Created attachment 42232
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42232=edit
A patch to add -fstatic-PIE/-fstatic-pie
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #1 from H.J. Lu ---
A static PIE option can be used for both kernel
as well as user space.
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