wireguard-openbsd/lib/csu/arm, branch masterWireGuard implementation for the OpenBSD kernelhttps://git.zx2c4.com/wireguard-openbsd/atom/lib/csu/arm?h=master2020-10-19T17:57:40Zreplace ad-hoc illegal instruction with the architecturally defined one2020-10-19T17:57:40Znaddynaddy@openbsd.org2020-10-19T17:57:40Zurn:sha1:5bbf88322ed6a7a68da69a643f5f3b793160f0cd
("permanently undefined")
ok deraadt@ kettenis@
crt0 MD _dl_exit() performs syscall to SYS_exit directly, but then2020-10-15T16:30:21Zderaadtderaadt@openbsd.org2020-10-15T16:30:21Zurn:sha1:2bc3a8c076b486ad5cb1adf52ac1373fba054b0a
some of these functions were returning. That makes the +1word address
a fairly strong and easily located gadget. Put a hard-trap
instruction after the syscall. This remains a gadget for 'terminal
system' calls (such as execve), but hey that's why we have pledge w/o
"exec" throughout the tree.
Quite surprisingly, hppa's delay-slot load of SYS_exit makes it the
safest of the bunch, not that this helps anyone.
ok kettenis
use symbolic SYS_exit instead of the value 12020-10-14T22:11:18Zderaadtderaadt@openbsd.org2020-10-14T22:11:18Zurn:sha1:9c558c1181d4532fa3a04595bff127adc23ef057
ok kettenis
Anthony Steinhauser reports that 32-bit arm cpus have the same speculation2020-03-13T09:31:24Zderaadtderaadt@openbsd.org2020-03-13T09:31:24Zurn:sha1:f74a2b77455090a00a6234c40c5f02aa52986a5b
problems as 64-bit models. To resolve the syscall speculation, as a first
step "nop; nop" was added after all occurances of the syscall ("swi 0")
instruction. Then the kernel was changed to jump over the 2 extra instructions.
In this final step, those pair of nops are converted into the speculation-blocking
sequence ("dsb nsh; isb").
Don't try to build through these multiple steps, use a snapshot instead.
Packages matching the new ABI will be out in a while...
ok kettenis
Anthony Steinhauser reports that 32-bit arm cpus have the same speculation2020-03-11T13:09:29Zderaadtderaadt@openbsd.org2020-03-11T13:09:29Zurn:sha1:afaa629c2449cf45f3998658bc9ce86c63099379
problems as 64-bit models. For the syscall instruction issue, add nop;nop
after swi 0, in preparation for jumping over a speculation barrier here later.
_dl_printf is no longer referenced by RELOC_{JMPREL,DYN,GOT}; delete the stub2017-08-11T20:13:30Zguentherguenther@openbsd.org2017-08-11T20:13:30Zurn:sha1:344baaa7369214af57d570c2005bb07927710f77
ok kettenis@
Use a long branch (using movw/movt) to implement MD_SECT_CALL_FUNC.2017-02-26T15:20:58Zketteniskettenis@openbsd.org2017-02-26T15:20:58Zurn:sha1:08c612f178f469b0f8f2b00e2ab61610e3556188
Necessary (but perhaps not suffcient) to build large binaries on arm.
ok guenther@
Declare the symbols that label the .ctors, .dtors, .eh_frame, and .jcr2017-01-21T00:45:13Zguentherguenther@openbsd.org2017-01-21T00:45:13Zurn:sha1:b3fe29f4687edf2be8c3fc3433d38bd40593a33b
sections as extern hidden arrays of indefinite size, so that the compiler
(well, clang) doesn't believe it knows the exact contents and thus optimize
things into infinite loops. Actually set the symbols to be in the sections
and insert the leading and trailing values via __asm().
Problem pointed out by patrick@
testing and ok kettenis@
Simplify code that sets up a stack frame for running .init code to be more2016-10-03T22:13:30Zketteniskettenis@openbsd.org2016-10-03T22:13:30Zurn:sha1:306c523a48caa279c9d206c6b255f25839cac41b
AEABI-like.
ok tom@, jsg@
Implement self-relocation for -static -pie on arm. Also removes some2016-09-08T18:56:58Zketteniskettenis@openbsd.org2016-09-08T18:56:58Zurn:sha1:dfd75ee2a3128c0a7d2b0f51c6f5b6b1aefd869c
unecessary code from the normal startup code and do some general cleanup to
make the code more readable.
ok guenther@, jsg@