Create a new header lwp_private.h to contain _lwp_getprivate_fast,
_lwp_gettcb_fast, _lwp_settcb and remove them from mcontext.h, so that:
1. we don't need special hacks to hide them
2. we can include <lwp.h> where needed to get the necessary prototypes
without redefining them locally.

Undo previous lwp.h change.

Split __lwp_getprivate_fast and __lwp_*tcb from mcontext.h into a separate
lwp.h file.

branches: 1.9.2;
Add more ABI register defines - should have been committed with previous
change.

Fix the __greg_t typedef for riscv32

RISC-V support that works on QEMU with a single hart.

Thanks for Simon Burge for plic(4).

Trailing whitespace

branches: 1.5.4;
Introduce _UC_MACHINE_FP() as a macro

_UC_MACHINE_FP() is a helper macro to extract from mcontext a frame pointer.

Don't rely on this interface as a compiler might strip frame pointer or
optimize it making this interface unreliable.


For hppa assume a small frame context, for larger frames FP might be located
in a different register (4 instead of 3).

For ia64 there is no strict frame pointer, and registers might rotate.
Reuse 79 following:

./gcc/config/ia64/ia64.h:#define HARD_FRAME_POINTER_REGNUM LOC_REG (79)

Once ia64 will mature, this should be revisited.

A macro can encapsulate a real function for extracting Frame Pointer on
more complex CPUs / ABIs.


For the remaining CPUs, reuse standard register as defined in appropriate ABI.

The direct users of this macro are LLVM and GCC with Sanitizers.

Proposed on tech-userlevel@.

Sponsored by <The NetBSD Foundation>

branches: 1.4.10; 1.4.16;
Add _REG_S0

Switch to new ABI (return values now in a0/a1; v0/v1 are no more)

branches: 1.2.2;
Fix a typo: the PC is likely in _REG_PC

New files for Userland support of UCB RISC-V (both 32-bit and 64-bit)