CVS log for src/sys/arch/riscv/include/mcontext.h

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Keyword substitution: kv
Default branch: MAIN

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.

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).

Merge changes from current as of 20200406

Trailing whitespace

Pull up the following, requested by kamil in ticket #552:

external/gpl3/gcc{.old}/dist/libsanitizer/asan/asan_linux.cc 1.4
sys/arch/aarch64/include/mcontext.h             1.2
sys/arch/alpha/include/mcontext.h               1.9
sys/arch/amd64/include/mcontext.h               1.19
sys/arch/arm/include/mcontext.h                 1.19
sys/arch/hppa/include/mcontext.h                1.9
sys/arch/i386/include/mcontext.h                1.14
sys/arch/ia64/include/mcontext.h                1.6
sys/arch/m68k/include/mcontext.h                1.10
sys/arch/mips/include/mcontext.h                1.22
sys/arch/or1k/include/mcontext.h                1.2
sys/arch/powerpc/include/mcontext.h             1.18
sys/arch/riscv/include/mcontext.h               1.5
sys/arch/sh3/include/mcontext.h                 1.11
sys/arch/sparc/include/mcontext.h               1.14-1.17
sys/arch/sparc64/include/mcontext.h             1.10
sys/arch/vax/include/mcontext.h                 1.9
tests/lib/libc/sys/Makefile                     1.50
tests/lib/libc/sys/t_ucontext.c                 1.2-1.5
sys/arch/hppa/include/mcontext.h		1.10
sys/arch/ia64/include/mcontext.h		1.7

- Introduce _UC_MACHINE_FP().  _UC_MACHINE_FP() is a helper
  macro to extract from mcontext a frame pointer.
- Add new tests in lib/libc/sys/t_ucontext:
  * ucontext_sp (testing _UC_MACHINE_SP)
  * ucontext_fp (testing _UC_MACHINE_FP)
  * ucontext_pc (testing _UC_MACHINE_PC)
  * ucontext_intrv (testing _UC_MACHINE_INTRV)

Add a dummy implementation of _UC_MACHINE_INTRV() for ia64.

Implement _UC_MACHINE_INTRV() for hppa.

Make the t_ucontext.c test more portable.

We now have _UC_MACHINE_FP.

revert ticket 552, which broke the build

Pull up following revision(s) (requested by kamil in ticket #552):
	sys/arch/aarch64/include/mcontext.h: 1.2
	sys/arch/alpha/include/mcontext.h: 1.9
	sys/arch/amd64/include/mcontext.h: 1.19
	sys/arch/arm/include/mcontext.h: 1.19
	sys/arch/hppa/include/mcontext.h: 1.9
	sys/arch/i386/include/mcontext.h: 1.14
	sys/arch/ia64/include/mcontext.h: 1.6
	sys/arch/m68k/include/mcontext.h: 1.10
	sys/arch/mips/include/mcontext.h: 1.22
	sys/arch/or1k/include/mcontext.h: 1.2
	sys/arch/powerpc/include/mcontext.h: 1.18
	sys/arch/riscv/include/mcontext.h: 1.5
	sys/arch/sh3/include/mcontext.h: 1.11
	sys/arch/sparc/include/mcontext.h: 1.14-1.17
	sys/arch/sparc64/include/mcontext.h: 1.10
	sys/arch/vax/include/mcontext.h: 1.9
	tests/lib/libc/sys/Makefile: 1.50
	tests/lib/libc/sys/t_ucontext.c: 1.2
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>
--
Improve _UC_MACHINE_FP() for SPARC/SPARC64
Introduce a static inline function _uc_machine_fp() that contains improved
caluclation of a frame pointer.
Algorithm:
  uptr *stk_ptr;
#  if defined (__arch64__)
  stk_ptr = (uptr *) (*sp + 2047);
#  else
  stk_ptr = (uptr *) *sp;
#  endif
  *bp = stk_ptr[15];
Noted by <mrg>
--
Make _UC_MACHINE_FP() compile again and fix it so that it does not add
the offset twice.
--
fix _UC_MACHINE32_FP() -- use 32 bit pointer value so that [15] is
the right offset.  do this by using __greg32_t, which is only in
the sparc64 version, and these are only useful there, so move them.
--
Add new tests in lib/libc/sys/t_ucontext
New tests:
 - ucontext_sp
 - ucontext_fp
 - ucontext_pc
 - ucontext_intrv
They test respectively:
 - _UC_MACHINE_SP
 - _UC_MACHINE_FP
 - _UC_MACHINE_PC
 - _UC_MACHINE_INTRV
These tests attempt to access and print the values from ucontext, without
interpreting the values.
This is a follow up of the _UC_MACHINE_FP() introduction.
These tests use PRIxREGISTER, and require to be built with -D_KERNTYPES.
Sponsored by <The NetBSD Foundation>

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>

update from HEAD

Sync with HEAD

file mcontext.h was added on branch tls-maxphys on 2017-12-03 11:36:39 +0000

Add _REG_S0

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

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)