---
- branch: MAIN
  date: Wed Jun 26 12:30:13 UTC 2019
  files:
  - new: '1.75'
    old: '1.74'
    path: src/lib/libc/sys/ptrace.2
    pathrev: src/lib/libc/sys/ptrace.2@1.75
    type: modified
  - new: '1.124'
    old: '1.123'
    path: src/sys/arch/amd64/amd64/netbsd32_machdep.c
    pathrev: src/sys/arch/amd64/amd64/netbsd32_machdep.c@1.124
    type: modified
  - new: '1.40'
    old: '1.39'
    path: src/sys/arch/amd64/amd64/process_machdep.c
    pathrev: src/sys/arch/amd64/amd64/process_machdep.c@1.40
    type: modified
  - new: '1.24'
    old: '1.23'
    path: src/sys/arch/amd64/include/netbsd32_machdep.h
    pathrev: src/sys/arch/amd64/include/netbsd32_machdep.h@1.24
    type: modified
  - new: '1.16'
    old: '1.15'
    path: src/sys/arch/amd64/include/ptrace.h
    pathrev: src/sys/arch/amd64/include/ptrace.h@1.16
    type: modified
  - new: '1.93'
    old: '1.92'
    path: src/sys/arch/i386/i386/process_machdep.c
    pathrev: src/sys/arch/i386/i386/process_machdep.c@1.93
    type: modified
  - new: '1.23'
    old: '1.22'
    path: src/sys/arch/i386/include/ptrace.h
    pathrev: src/sys/arch/i386/include/ptrace.h@1.23
    type: modified
  - new: '1.17'
    old: '1.16'
    path: src/sys/arch/x86/include/cpu_extended_state.h
    pathrev: src/sys/arch/x86/include/cpu_extended_state.h@1.17
    type: modified
  - new: '1.17'
    old: '1.16'
    path: src/sys/arch/x86/include/fpu.h
    pathrev: src/sys/arch/x86/include/fpu.h@1.17
    type: modified
  - new: '1.54'
    old: '1.53'
    path: src/sys/arch/x86/x86/fpu.c
    pathrev: src/sys/arch/x86/x86/fpu.c@1.54
    type: modified
  - new: '1.129'
    old: '1.128'
    path: src/tests/lib/libc/sys/t_ptrace_wait.c
    pathrev: src/tests/lib/libc/sys/t_ptrace_wait.c@1.129
    type: modified
  - new: '1.16'
    old: '1.15'
    path: src/tests/lib/libc/sys/t_ptrace_x86_wait.h
    pathrev: src/tests/lib/libc/sys/t_ptrace_x86_wait.h@1.16
    type: modified
  id: 20190626T123013Z.b942f2811cc380c23d882e800df4336c549e3cc9
  log: |
    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).
  module: src
  subject: 'CVS commit: src'
  unixtime: '1561552213'
  user: mgorny