genode/base-linux
Christian Prochaska 4b420f6e71 Fix stack pointer alignment for x86_64 platforms
The x86_64 ABI requires the stack pointer to be 16-byte aligned before the
call of a function and decreased by 8 at the function entrypoint (after
the return address has been pushed to the stack).

Currently, when a new Genode thread gets created, the initial stack
pointer is aligned to 16 byte. On Genode/Linux, the thread entry function
is entered by a 'call' instruction, so the stack pointer alignment at the
function entrypoint is correct. On Fiasco.OC and NOVA, however, the thread
entry function gets executed without a return address being pushed to the
stack, so at the function entrypoint the stack pointer is still aligned to
16 byte, which can cause problems with compiler-generated SSE
instructions.

With this patch, the stack pointer given to a new thread gets aligned to
16 bytes and decreased by 8 by default, since most of the currently
supported base platforms execute the thread entry function without pushing
a return address to the stack. For base-linux, the stack pointer gets
realigned to 16 bytes before the thread entry function gets called.

Fixes #1043.
2014-02-03 11:34:30 +01:00
..
etc base-linux: add ARM support 2013-05-24 14:55:37 +02:00
include thread: rearrange thread context management 2014-01-27 18:54:09 +01:00
lib base: Unify 'Platform_env' across platforms 2013-10-05 12:44:36 +02:00
mk base-linux: add ARM support 2013-05-24 14:55:37 +02:00
run base-linux: hybrid file-system server 2013-11-26 14:32:06 +01:00
src Fix stack pointer alignment for x86_64 platforms 2014-02-03 11:34:30 +01:00
README Imported Genode release 11.11 2011-12-22 16:19:25 +01:00

This repository contains the Linux-specific implementation of Genode.