litmus-rt.git/arch/xtensa, branch v2.6.26-rc1

xtensa: use kbuild.h macros instead of defining them in asm-offsets.c

2008-04-29T15:06:29+00:00

Signed-off-by: Christoph Lameter 
Cc: Chris Zankel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Generic semaphore implementation

2008-04-17T14:42:34+00:00

Semaphores are no longer performance-critical, so a generic C
implementation is better for maintainability, debuggability and
extensibility.  Thanks to Peter Zijlstra for fixing the lockdep
warning.  Thanks to Harvey Harrison for pointing out that the
unlikely() was unnecessary.

Signed-off-by: Matthew Wilcox 
Acked-by: Ingo Molnar

[XTENSA] Allow debugger to modify the WINDOWBASE register.

2008-02-14T01:45:36+00:00

For the 'return' command, GDB needs to adjust WINDOWBASE.
In case WB is different from 0, we need to rotate the
window register file and update WINDOWSTART and WMASK.
This patch also removes some ret|= statements for
__get_user/__put_user as the address range was alrady
checked a couple of lines earlier.

Signed-off-by: Chris Zankel

[XTENSA] Fix makefile to work with binutils-2.18.

2008-02-14T01:45:05+00:00

When building with binutils-2.18, vmlinux includes .note.gnu.build-id
sections that need to be stripped out when building the binary image.
The old .xt.insn sections haven't been used for a long time, so don't
bother stripping them.

Signed-off-by: Bob Wilson 
Signed-off-by: Chris Zankel

[XTENSA] Fix register corruption for certain processor configurations

2008-02-14T01:43:54+00:00

For processor configurations that have optional registers
(compiler-used but non-coprocessor), user space registers
might get corrupted when there are only 4 registers in
the current window-frame, ie. register a4 belongs to the
oldest frame in the register file.

Signed-off-by: Chris Zankel

[XTENSA] Add support for the sa_restorer function

2008-02-14T01:42:31+00:00

Supporting the sa_restorer function allows for better security
since the sigreturn system call doesn't need to be placed on
the stack, so the stack doesn't need to be executable. This
requires support from the c-library as it has to provide the
restorer function.

Signed-off-by: Chris Zankel

[XTENSA] Add support for configurable registers and coprocessors

2008-02-14T01:41:43+00:00

The Xtensa architecture allows to define custom instructions and
registers. Registers that are bound to a coprocessor are only
accessible if the corresponding enable bit is set, which allows
to implement a 'lazy' context switch mechanism. Other registers
needs to be saved and restore at the time of the context switch
or during interrupt handling.

This patch adds support for these additional states:

- save and restore registers that are used by the compiler upon
  interrupt entry and exit.
- context switch additional registers unbound to any coprocessor
- 'lazy' context switch of registers bound to a coprocessor
- ptrace interface to provide access to additional registers
- update configuration files in include/asm-xtensa/variant-fsf

Signed-off-by: Chris Zankel

[XTENSA] Use preprocessor to generate the linker script for the ELF boot image

2008-02-14T01:26:17+00:00

Signed-off-by: Marc Gauthier 
Signed-off-by: Chris Zankel

[XTENSA] Add missing RELOCATE_ENTRY for debug vector

2008-02-14T01:25:14+00:00

We also need to relocate the debug vector if in RAM.

Signed-off-by: Marc Gauthier

[XTENSA] Remove unused code

2008-02-14T01:24:17+00:00

We will never (need to) support signal handling coming from a
double exception. There are too many things that could go wrong
and delivering signals is not the fastest method for IPC, anyway.

Signed-off-by: Chris Zankel