CVS commit: [netbsd-8] src

["Soren Jacobsen" <snj%netbsd.org@localhost>]

Module Name:    src
Committed By:   snj
Date:           Sun Feb 25 23:50:24 UTC 2018

Modified Files:
        src/sys/arch/aarch64/include [netbsd-8]: mcontext.h
        src/sys/arch/alpha/include [netbsd-8]: mcontext.h
        src/sys/arch/amd64/include [netbsd-8]: mcontext.h
        src/sys/arch/arm/include [netbsd-8]: mcontext.h
        src/sys/arch/hppa/include [netbsd-8]: mcontext.h
        src/sys/arch/i386/include [netbsd-8]: mcontext.h
        src/sys/arch/ia64/include [netbsd-8]: mcontext.h
        src/sys/arch/m68k/include [netbsd-8]: mcontext.h
        src/sys/arch/mips/include [netbsd-8]: mcontext.h
        src/sys/arch/or1k/include [netbsd-8]: mcontext.h
        src/sys/arch/powerpc/include [netbsd-8]: mcontext.h
        src/sys/arch/riscv/include [netbsd-8]: mcontext.h
        src/sys/arch/sh3/include [netbsd-8]: mcontext.h
        src/sys/arch/sparc/include [netbsd-8]: mcontext.h
        src/sys/arch/sparc64/include [netbsd-8]: mcontext.h
        src/sys/arch/vax/include [netbsd-8]: mcontext.h
        src/tests/lib/libc/sys [netbsd-8]: Makefile t_ucontext.c

Log Message:
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>


To generate a diff of this commit:
cvs rdiff -u -r1.1 -r1.1.22.1 src/sys/arch/aarch64/include/mcontext.h
cvs rdiff -u -r1.8 -r1.8.32.1 src/sys/arch/alpha/include/mcontext.h
cvs rdiff -u -r1.18 -r1.18.20.1 src/sys/arch/amd64/include/mcontext.h
cvs rdiff -u -r1.18 -r1.18.10.1 src/sys/arch/arm/include/mcontext.h
cvs rdiff -u -r1.8 -r1.8.22.1 src/sys/arch/hppa/include/mcontext.h
cvs rdiff -u -r1.12 -r1.12.22.1 src/sys/arch/i386/include/mcontext.h
cvs rdiff -u -r1.5 -r1.5.8.1 src/sys/arch/ia64/include/mcontext.h
cvs rdiff -u -r1.9 -r1.9.42.1 src/sys/arch/m68k/include/mcontext.h
cvs rdiff -u -r1.21 -r1.21.10.1 src/sys/arch/mips/include/mcontext.h
cvs rdiff -u -r1.1 -r1.1.12.1 src/sys/arch/or1k/include/mcontext.h
cvs rdiff -u -r1.17 -r1.17.12.1 src/sys/arch/powerpc/include/mcontext.h
cvs rdiff -u -r1.4 -r1.4.10.1 src/sys/arch/riscv/include/mcontext.h
cvs rdiff -u -r1.10 -r1.10.32.1 src/sys/arch/sh3/include/mcontext.h
cvs rdiff -u -r1.13 -r1.13.32.1 src/sys/arch/sparc/include/mcontext.h
cvs rdiff -u -r1.9 -r1.9.32.1 src/sys/arch/sparc64/include/mcontext.h
cvs rdiff -u -r1.8 -r1.8.40.1 src/sys/arch/vax/include/mcontext.h
cvs rdiff -u -r1.49 -r1.49.4.1 src/tests/lib/libc/sys/Makefile
cvs rdiff -u -r1.1 -r1.1.34.1 src/tests/lib/libc/sys/t_ucontext.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.