CVS commit: src

[Michał Górny <mgorny%netbsd.org@localhost>]

Module Name:    src
Committed By:   mgorny
Date:           Wed Jun 26 12:30:13 UTC 2019

Modified Files:
        src/lib/libc/sys: ptrace.2
        src/sys/arch/amd64/amd64: netbsd32_machdep.c process_machdep.c
        src/sys/arch/amd64/include: netbsd32_machdep.h ptrace.h
        src/sys/arch/i386/i386: process_machdep.c
        src/sys/arch/i386/include: ptrace.h
        src/sys/arch/x86/include: cpu_extended_state.h fpu.h
        src/sys/arch/x86/x86: fpu.c
        src/tests/lib/libc/sys: t_ptrace_wait.c t_ptrace_x86_wait.h

Log Message:
Implement PT_GETXSTATE and PT_SETXSTATE

Introduce two new ptrace() requests: PT_GETXSTATE and PT_SETXSTATE,
that provide access to the extended (and extensible) set of FPU
registers on amd64 and i386.  At the moment, this covers AVX (YMM)
and AVX-512 (ZMM, opmask) registers.  It can be easily extended
to cover further register types without breaking backwards
compatibility.

PT_GETXSTATE issues the XSAVE instruction with all kernel-supported
extended components enabled.  The data is copied into 'struct xstate'
(which -- unlike the XSAVE area itself -- has stable format
and offsets).

PT_SETXSTATE issues the XRSTOR instruction to restore the register
values from user-provided 'struct xstate'.  The function replaces only
the specific XSAVE components that are listed in 'xs_rfbm' field,
making it possible to issue partial updates.

Both syscalls take a 'struct iovec' pointer rather than a direct
argument.  This requires the caller to explicitly specify the buffer
size.  As a result, existing code will continue to work correctly
when the structure is extended (performing partial reads/updates).


To generate a diff of this commit:
cvs rdiff -u -r1.74 -r1.75 src/lib/libc/sys/ptrace.2
cvs rdiff -u -r1.123 -r1.124 src/sys/arch/amd64/amd64/netbsd32_machdep.c
cvs rdiff -u -r1.39 -r1.40 src/sys/arch/amd64/amd64/process_machdep.c
cvs rdiff -u -r1.23 -r1.24 src/sys/arch/amd64/include/netbsd32_machdep.h
cvs rdiff -u -r1.15 -r1.16 src/sys/arch/amd64/include/ptrace.h
cvs rdiff -u -r1.92 -r1.93 src/sys/arch/i386/i386/process_machdep.c
cvs rdiff -u -r1.22 -r1.23 src/sys/arch/i386/include/ptrace.h
cvs rdiff -u -r1.16 -r1.17 src/sys/arch/x86/include/cpu_extended_state.h \
    src/sys/arch/x86/include/fpu.h
cvs rdiff -u -r1.53 -r1.54 src/sys/arch/x86/x86/fpu.c
cvs rdiff -u -r1.128 -r1.129 src/tests/lib/libc/sys/t_ptrace_wait.c
cvs rdiff -u -r1.15 -r1.16 src/tests/lib/libc/sys/t_ptrace_x86_wait.h

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