Commit Graph

7 Commits

Author SHA1 Message Date
Andrew Turner
aeb8eeb590 Save & restore the floating-pont argument registers before calling
_rtld_bind. The compiler may generate code using these registers and not
save them. Unfortunately, as we make use of libc, we are unable to disallow
rtld from using floating-point register without also doing the same for the
parts of libc we use, or by limiting what _rtld_bind is able to call.

Obtained from:	ABT Systems Ltd
Sponsored by:	The FReeBSD Foundation
2015-07-02 14:00:07 +00:00
Andrew Turner
ff8a3cb6e2 Also save x8. It may be passed into a function as the indirect result
location pointer when the return value doesn't fit in a register, e.g. when
returning a struct.

Obtained from:	ABT Systems Ltd
Sponsored by:	The FreeBSD Foundation
2015-06-23 10:32:26 +00:00
Andrew Turner
65706c12b2 Add a workaround to correctly align the stack before calling into C code.
When enough time has passed for users to update their userland the kernel
fix will be applied. This will change the ABI to have x0 point to the args
and sp be correctly aligned.

It is expected this compatibility code can be removed when the kernel and
qemu usermode emulation have both been updated for the new ABI.

This fixes clang failures, and most likely other crashes.

Obtained from:	ABT Systems Ltd
Sponsored by:	The FreeBSD Foundation
2015-06-22 19:43:08 +00:00
Andrew Turner
899b27a318 Use the correct value to get the offset of the objects tls data.
Sponsored by:	The FreeBSD Foundation
2015-04-15 14:20:12 +00:00
Andrew Turner
a97120d61e Add support for thread local storage on arm64 to the runtime linker. The
ABI specifies that, for R_AARCH64_TLSDESC relocations, we use the symbol
value, addend, and object tls offset to calculate the offset from the tls
base. We then cache this value for future reference.

Differential Revision:	https://reviews.freebsd.org/D2183
Reviewed by:	kib
Sponsored by:	The FreeBSD Foundation
2015-04-03 09:35:52 +00:00
Ed Maste
f5f299c30b Correct copyright typo 2015-03-31 12:53:07 +00:00
Andrew Turner
047c6e3ae6 Add the arm64 code to the runtime linker. It's not able to be built as we
still need libc_pic for a few things, but this is expected to be ready
soon.

Differential Revision:	https://reviews.freebsd.org/D2136
Reviewed by:	kib
Sponsored by:	The FreeBSD Foundation
2015-03-31 09:51:19 +00:00