litmus-rt.git/arch/tile/include/uapi/asm, branch test

tile: default to little endian on older toolchains

2015-01-13T15:13:30+00:00

Older toolchains may not specify __LITTLE_ENDIAN__, but older
toolchains were all little endian.  Don't make things unnecessarily
hard for those toolchains.

Signed-off-by: Chris Metcalf

tile: avoid undefined behavior with regs[TREG_TP] etc

2014-11-13T14:39:26+00:00

Recent compilers warn about accesses to arrays past the end,
which is supported for pt_regs and sigcontext with the
intended alias past the end of regs[] to sp, tp, and lr
using TREG_SP, TREG_TP, and TREG_LR.

Make the intended usage explict by providing an anonymous
union of regs[56] on the one hand, and a short __regs[53]
on the other followed by the sp, tp, and lr fields, so the
aliasing is done explicitly and is visible to the compiler.

Reviewed-by: Jeff Epler 
Signed-off-by: Chris Metcalf

tile: implement gettimeofday() via vDSO

2013-08-13T20:26:21+00:00

This change creates the framework for vDSO calls, makes the existing
rt_sigreturn() mechanism use it, and adds a fast gettimeofday().
Now that we need to expose the vDSO address to userspace, we add
AT_SYSINFO_EHDR to the set of aux entries provided to userspace.
(You can disable any extra vDSO support by booting with vdso=0,
but the rt_sigreturn vDSO page will still be provided.)

Note that glibc has supported the tile vDSO since release 2.17.

Signed-off-by: Chris Metcalf

tile: convert uses of "inv" to "finv"

2013-07-31T15:51:19+00:00

The "inv" (invalidate) instruction is generally less safe than "finv"
(flush and invalidate), as it will drop dirty data from the cache.
It turns out we have almost no need for "inv" (other than for the
older 32-bit architecture in some limited cases), so convert to
"finv" where possible and delete the extra "inv" infrastructure.

Signed-off-by: Chris Metcalf

tile: Add definition of NR_syscalls

2013-03-21T19:39:35+00:00

It is required by the syscall tracepoint mechanism.

Signed-off-by: Simon Marchi 
Signed-off-by: Chris Metcalf

arch/tile: clean up tile-specific PTRACE_SETOPTIONS

2012-12-14T17:56:54+00:00

Use the newer idioms for setting PTRACE_O_xxx and PT_TRACE_xxx flags.
Only set/clear tile-specific flags if the generic routine returns
success, since otherwise we want to avoid setting any flags at all.
Atomically update the ptrace flags with the new values.  Eliminate
the PT_TRACE_MASK_TILE bitmask and just shift PTRACE_O_MASK_TILE.
Add a BUILD_BUG_ON to avoid overlapping with generic bits.

Acked-by: Oleg Nesterov 
Signed-off-by: Chris Metcalf

arch/tile: provide PT_FLAGS_COMPAT value in pt_regs

2012-12-13T16:34:24+00:00

This flag is set for ptrace GETREGS or PEEKUSER for processes
that are COMPAT, i.e. 32-bit.  This allows things like strace
to easily discover what personality to use, for example.

Acked-by: Oleg Nesterov 
Signed-off-by: Chris Metcalf

UAPI: The tile arch uses the generic ucontext.h file

2012-10-17T11:31:16+00:00

Move the header-y and generic-y lines for ucontext.h from
arch/tile/include/asm/Kbuild to the uapi/ Kbuild as the asm-generic variant is
used.

Signed-off-by: David Howells 
cc: Chris Metcalf

UAPI: (Scripted) Disintegrate arch/tile/include/asm

2012-10-09T08:47:47+00:00

Signed-off-by: David Howells 
Acked-by: Arnd Bergmann 
Acked-by: Thomas Gleixner 
Acked-by: Michael Kerrisk 
Acked-by: Paul E. McKenney 
Acked-by: Dave Jones

UAPI: (Scripted) Set up UAPI Kbuild files

2012-10-02T17:01:35+00:00

Set up empty UAPI Kbuild files to be populated by the header splitter.

Signed-off-by: David Howells 
Acked-by: Arnd Bergmann 
Acked-by: Thomas Gleixner 
Acked-by: Paul E. McKenney 
Acked-by: Dave Jones